Patent Publication Number: US-10323290-B2

Title: Pelt board system and a fastening assembly

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application is the national phase entry, under 35 U.S.C. Section 371(c), of International Application No. PCT/EP2015/056441, filed Mar. 25, 2015, claiming priority from European Application Nos. 14161481.8, filed Mar. 25, 2014, 14161509.6, filed Mar. 25, 2014, 14199640.5, filed Dec. 22, 2014, and 14199651.2, filed Dec. 22, 2014. The disclosures of the International Application and the European Applications from which this application claims priority are incorporated herein by reference in their entireties. 
     FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT 
     Not Applicable 
     The present invention relates to a pelt board system comprising a pelt board and a fastening assembly. Furthermore, the present invention relates to a fastening assembly. 
     BACKGROUND 
     In the drying of pelts, e.g. mink or fox pelt, after skinning and scraping off the layer of fat on the leather side of the pelt, the pelts are typically stretched on a pelt board which is often provided with a fat-absorbing material with the object of removing the remaining fat on the leather side of the pelt. 
     The use of pelt boards in connection with the drying of pelts is well known in the prior art and there has in the past been developed a great number of configurations of such pelt boards. There has also been established a standard of pelt sizes and thus also of pelt boards. 
     The most widespread pelt boards in the past were made of wood, and may in short be described as a flat piece of wood defining a longitudinal direction and having in the longitudinal direction a first broadside surface, a second broadside surface, a first narrow side surface and a second narrow side surface. One end of the board, the bottom end, is cut off at right angles to the longitudinal direction. The lower end adjacent the bottom has a constant breadth, which breadth gradually decreases towards a pointed and rounded end approaching the top end of the board. Such boards typically also have a longitudinal slot for allowing air to pass. 
     The drying procedure of the pelt shall be understood to be a drying-out of the leather side of the pelt to an extent which by experience prevents any attack on the pelt by mites. The drying process is typically effected by the blowing of dry air in the slot on the board via pipes which are introduces into the slot, where via the perforations in the walls of the pelt bag the dry air is diffused out of the leather side of the pelt and dries the pelt. 
     From WO 01/62985 is known a bag shaped holster, which is referred to as a fixing bag, which is used for securing the pelts on a pelt board during the drying process. The fixing bag is drawn over the board with the stretched pelt from the cranium end of the pelt so that the fur side of the pelt is in tight contact with the fur, which results in the pelt being pressed against the board with a force which is sufficient for the pelt to remain substantially in the stretched position during the drying. 
     Further prior art includes U.S. Pat. No. 3,137,963 in which a pelt board comprising a flat body of sheet metal having perforations therein and beads along the sides is disclosed. 
     In WO 2005/026394 is disclosed a pelt board which is lockable in a position, in which it has a first circumference and can also assume a position in which it has a second circumference being smaller than the first circumference by displacing opposing half parts in relation to each other. This results in a considerably easier removal of the pelt from the pelt board. 
     U.S. Pat. No. 1,110,016 relates to a pelt board having a pair of longitudinal legs and a nose piece located there between. 
     U.S. Pat. No. 3,526,967 relates to a pelt drying system including an air conditioning unit for supplying temperature controlled air to a number of manifolds having nozzles onto which the pelt drying frames are attached. 
     WO 82/03634 relates to a pelting board of non-absorbing plastics having a plurality of channels near its edges to supply drying air to the edges of the board so that the pelt dry evenly and stick less often to the board. 
     U.S. Pat. No. 3,303,038 relates to a pelt drying frame comprising opposite side rods joined at a nose over which frame a pelt may be drawn and held taut. 
     DK 2012 70519 A1 relates to a pelt board has a lower part and an upper part. The lower part has an outer cross section circumference which is substantially constant and the upper part has an outer cross section which is gradually decreasing. 
     DK 2013 00091 U4 relates to a pelt board has a lower part and an upper part. The lower part has an outer cross section circumference, which is substantially constant and the upper part has an outer cross section which is gradually decreasing. The lower part extends between 36 cm and 50 cm. 
     DK 177480 B1 discloses a pelt board having two broad elongated side surfaces. The pelt board comprises expansion means defining a narrow elongated side surface extending between side edges of the broad side surfaces. The expansion means are movable between an expanded position and a non-expanded position. 
     Some of the above pelt boards have an outer circumference made up of opposing non-movable surfaces and opposing movable surfaces. Pelt boards having this variable circumference for simplifying the removal of the pelt after drying are thus known in the prior art. The pelt boards are thus expanded during the drying process. As the pelt is fixated firmly during drying and may shrink slightly, the pelts may be difficult to remove from the pelt boards. Further, the pelts are typically fixated in a stretched state, thus increasing the pressure of the pelt onto the pelt board. By reducing the circumference of the pelt board, the pelt will be easier to remove from the pelt board. 
     However, the pelt boards used until now only feature a limited variation in the circumference in that only a limited part of the circumferential surfaces are moving/may be reduced. Typically, the prior art pelt boards have two opposing surfaces which are movable in relation to each other and thus, there may still exist opposing surfaces or parts of the circumference which are non-movable in relation to each other. Although the pelt board according to the prior art may alter the total circumference and thereby relax the pelt, it has been noticed by the applicant that the pelt in some circumstances may still stick quite firm onto the pelt board at the locations of the pelt board at which the surface or circumference has not been reduced. 
     It is thus an object according to the present invention to provide technologies for simplifying the removal of the pelts from the pelt boards and avoiding the situations where the pelt due to the drying and stretching may stick to the pelt board, and at the same time ensure that the pelt board keeps a substantially elliptical circumference in order to distribute the inwardly oriented pressure of the pelt evenly over the pelt board. 
     It is an advantage according to the present invention that the pelt board may be locked in the expanded position and that the movement between the expanded position and the reduced position may be performed very accurately using very little force. 
     It is a feature according to the present invention that the pelt board may be modified to accommodate pelts of different sizes and shapes. 
     SUMMARY OF THE INVENTION 
     The above object, the above features and the above advantage together with numerous other objects, advantages and features, which will be evident from the below detailed description of the present invention, are according to a first aspect of the present invention obtained by an elongated pelt board for accommodating an animal pelt, the pelt board defining a longitudinal direction, a first radial direction perpendicular to the longitudinal direction and a second radial direction perpendicular to the longitudinal direction and the first radial direction, the pelt board comprising:
         a first wall element extending along the longitudinal direction and defining a first outwardly oriented surface, a first inwardly oriented surface, a first set of oppositely located longitudinal edges and a first actuator member,   a second wall element extending along the longitudinal direction and defining a second outwardly oriented surface, a second inwardly oriented surface facing the first inwardly oriented surface, a second set of oppositely located longitudinal edges and a second actuator member, the first and second wall elements being spaced apart in the first radial direction,   a third wall element extending along the longitudinal direction and defining a third outwardly oriented surface, a third inwardly oriented surface, a third set of oppositely located longitudinal edges and a third actuator member,   a fourth wall element extending along the longitudinal direction and defining a fourth outwardly oriented surface, a fourth inwardly oriented surface facing the third inwardly oriented surface, a fourth set of oppositely located longitudinal edges and a fourth actuator member, the third wall element and the fourth wall element being spaced apart in the second radial direction, the first inwardly oriented surface, the second inwardly oriented surface, the third inwardly oriented surface and the fourth inwardly oriented surface together defining a cavity along the longitudinal direction, the first wall element, the second wall element, the third wall element and the fourth wall element define:   a contracted state in which the first radial distance between the first inwardly oriented surface and the second inwardly oriented surface is reduced, and, the second radial distance between the third inwardly oriented surface and the fourth inwardly oriented surface is reduced, and   an expanded state in which the first radial distance between the first inwardly oriented surface and the second inwardly oriented surface is increased, and, the second radial distance between the third inwardly oriented surface and the fourth inwardly oriented surface is increased, and   an elongated core element extending within the cavity along the longitudinal direction between a top end and a bottom end and being movable in relation to each of the first wall element, second wall element, third wall element and fourth wall element, the elongated core element comprising a first cooperating member interacting with the first actuator member of the first wall element, a second cooperating member interacting with the second actuator member of the second wall element, a third cooperating member interacting with the third actuator member of the third wall element and a fourth cooperating member interacting with the fourth actuator member of the fourth wall element for allowing the first wall element, the second wall element, the third wall element and the fourth wall element to selectively define the contracted state or the expanded state by moving the elongated core element in the longitudinal direction relative to the first wall element, the second wall element, the third wall element and the fourth wall element.       

     The above object, the above features and the above advantage together with numerous other objects, advantages and features, which will be evident from the below detailed description of the present invention, are according to a second aspect of the present invention obtained by an elongated pelt board for accommodating an animal pelt, the pelt board defining a longitudinal direction, a first radial direction perpendicular to the longitudinal direction and a second radial direction perpendicular to the longitudinal direction and the first radial direction, the pelt board comprising:
         a first wall element extending along the longitudinal direction and defining a first outwardly oriented surface, a first inwardly oriented surface, a first set of oppositely located longitudinal edges and a first actuator member,   a second wall element extending along the longitudinal direction and defining a second outwardly oriented surface, a second inwardly oriented surface facing the first inwardly oriented surface, a second set of oppositely located longitudinal edges and a second actuator member, the first and second wall elements being spaced apart in the first radial direction,   a third wall element extending along the longitudinal direction and defining a third outwardly oriented surface, a third inwardly oriented surface, a third set of oppositely located longitudinal edges and a third actuator member,   a fourth wall element extending along the longitudinal direction and defining a fourth outwardly oriented surface, a fourth inwardly oriented surface facing the third inwardly oriented surface, a fourth set of oppositely located longitudinal edges and a fourth actuator member, the third wall element and the fourth wall element being spaced apart in the second radial direction, the first inwardly oriented surface, the second inwardly oriented surface, the third inwardly oriented surface and the fourth inwardly oriented surface together defining a cavity along the longitudinal direction, the first wall element, the second wall element, the third wall element and the fourth wall element define:   a contracted state in which the first radial distance between the first inwardly oriented surface and the second inwardly oriented surface is reduced, and, the second radial distance between the third inwardly oriented surface and the fourth inwardly oriented surface is reduced, and   an expanded state in which the first radial distance between the first inwardly oriented surface and the second inwardly oriented surface is increased, and, the second radial distance between the third inwardly oriented surface and the fourth inwardly oriented surface is increased, and   an elongated core element extending within the cavity along the longitudinal direction between a top end and a bottom end and being movable in relation to each of the first wall element, second wall element, third wall element and fourth wall element, the elongated core element comprising a first cooperating member interacting with the first actuator member of the first wall element, a second cooperating member interacting with the second actuator member of the second wall element, a third cooperating member interacting with the third actuator member of the third wall element and a fourth cooperating member interacting with the fourth actuator member of the fourth wall element for allowing the first wall element, the second wall element, the third wall element and the fourth wall element to selectively define the contracted state or the expanded state by moving the elongated core element in the longitudinal direction relative to the first wall element, the second wall element, the third wall element and the fourth wall element.       

     The pelt board according to the first and second aspect of the present invention should have an overall size which is suitable for accommodating a pelt of an animal such as a mink or fox. The pelt board according to the first and second aspect of the present invention typically has a substantially elliptic cylindrical shape which is tapering in the longitudinal direction. The pelt is applied onto the pelt board according to the first and second aspect of the present invention by drawing in onto the pelt board according to the first and second aspect of the present invention in the longitudinal direction, while the pelt board according to the first and second aspect of the present invention assumes its expanded state. It is understood that state of the art pelt bags may be used between the pelt and the pelt board according to the first and second aspect of the present invention in order to remove fatty substances from the pelt. The wall elements may be arched, which in connection with the wall elements should be understood to mean that the outer surfaces of the respective wall elements of the pelt board according to the first and second aspect of the present invention have a convex shape. The wall elements typically include a large number of holes or nozzles for allowing ventilation air to pass from the cavity within the pelt board according to the first and second aspect of the present invention to the outside through the pelt. 
     The first, second, third and fourth wall elements together define the substantially elliptical outer circumference of the pelt board according to the first and second aspect of the present invention, which is suitable for and adapted for accommodating a pelt of an animal, through its respective outwardly oriented surfaces. 
     The inwardly oriented surfaces may preferably define a concave shape, which surfaces together define the cavity in the pelt board according to the first and second aspect of the present invention. The wall elements are typically made of plastics. The wall elements are further delimited in the circumferential direction by longitudinal edges. 
     The elongated core element, which is located in the cavity, is movable in the longitudinal direction in relation to the wall elements. The actuator members of the wall elements and the cooperating members of the core element interact when the core element is moved in the longitudinal direction within the cavity. The cooperating members move in the longitudinal direction together with the elongated core whereas the actuator members move in any of the radial directions along with its respective wall element. The interaction between the cooperating members and the actuator members translate the longitudinal movement of the cooperating members to a radial movement of the actuator members. 
     The actuator members and the cooperating members thus cause the wall elements to move towards each other or away from each other in the respective first or second radial direction, thus making the cavity smaller or larger, when the core element is moved in the longitudinal direction relative to the wall elements. The wall elements are thus movable between the contacted state, in which the wall elements have moved towards each other, reducing the radial distances, and consequently the circumference of the pelt board according to the first and second aspects of the present invention and the cavity is small, and an expanded state in which the wall elements have moved away from each other, increasing the radial distances and consequently the circumference of the pelt board according to the first and second aspects of the present invention and the cavity is large. 
     Typically, an upward movement of the elongated core element in relation to the wall elements yields an expansion of the circumference of the pelt board according to the first and second aspects of the present invention, whereas a downward movement of the elongated core element in relation to the wall elements yields a contraction of the circumference of the pelt board according to the first and second aspects of the present invention. 
     Typically, the wall elements of the pelt board according to the first and second aspects of the present invention move in directions which are spaced apart by 90 degrees and thus realize a four way expansion and contraction of the pelt board according to the first and second aspects of the present invention. Thus, the radial directions are perpendicular, i.e. spaced apart by 90 degrees. In this way, the overall impression of the shape of the pelt board according to the first and second aspects of the present invention, i.e. the general circumferential profile, is at least largely unaffected by the movements of the wall elements. In this way, the outwardly oriented pressure on the pelt during the drying will be applied substantially uniformly in the pelt by the outer surfaces of the arched elements. The outer surface of the wall elements will constitute the contacts surface between the pelt and the pelt board according to the first and second aspects of the present invention, not taking into account the optional presence of a pelt bag between the pelt and the pelt board according to the first and second aspects of the present invention. Using a two way expansion and contraction, e.g. by opposing movable wall element, will necessarily apply more pressure on the pelt at the movable surfaces relative to the non-movable surfaces. Such non-uniformly applied pressure may lead to non-uniform pelts or even damages on the pelt. 
     When in the expanded state, the circumference of the pelt board according to the first and second aspects of the present invention is large. In this state the pelt is applied to the pelt board according to the first and second aspects of the present invention, optionally using a pelt bag. During the drying process, the pelt looses fat and moist and consequently contracts slightly. It may thereafter be very difficult to remove the pelt from the board. By contacting the pelt board according to the first and second aspects of the present invention by moving the wall element towards each other, the circumference of the pelt board according to the first and second aspects of the present invention defined by the outer surface of the wall elements will be smaller and thus typically allow the pelt to loosen from the outer surfaces of the wall elements, such that the pelt may be removed from the pelt board according to the first and second aspects of the present invention. In this context, the complete circumference of the pelt board according to the first and second aspects of the present invention will contract, effectively eliminating the risk of the pelt sticking to the pelt board according to the first and second aspects of the present invention. 
     According to further embodiments of the pelt board according to the first and second aspects of the present invention, when in the contracted state, the first and second sets of oppositely located longitudinal edges overlap respective edges of the third and fourth sets of oppositely located longitudinal edges or alternatively the third and fourth sets of oppositely located longitudinal edges overlapping respective edges of the first and second sets of oppositely located longitudinal edges, and, when in the expanded state the first and second sets of oppositely located longitudinal edges are substantially flush with respective edges of the third and fourth sets of oppositely located longitudinal edges. 
     In order to allow the pelt to maintain an attractive surface structure, the outer surfaces of the wall elements should be at least substantially continuous. In order to achieve a substantially continuous outwardly oriented surface, the longitudinal edges of the wall elements in the expanded state should be at least substantially flush. This means that the outer surfaces of the wall elements form a substantially continuous structure avoiding any large gaps between the wall elements and adjacent outer surfaces. 
     When the pelt board according to the first and second aspects of the present invention assumes the contracted state and in order to maintain the general circumferential profile of the pelt board according to the first and second aspects of the present invention, it is advantageous that the longitudinal edges of adjacent wall elements of the pelt board according to the first and second aspects of the present invention do overlap each other such that only a minor deviation from a continuous surface exists between adjacent outer surfaces of the wall elements. It is understood from the above that in order to realize the contraction, a part of the wall elements located at the respective longitudinal edges of the wall element may be pushed above or below its adjacent wall elements to form the overlapping such that the longitudinal edges are non-flush. 
     According to further embodiments of the pelt board according to the first and second aspects of the present invention, any of the first wall element, the second wall element, the third wall element and/or the fourth wall element define a central part and a peripheral part, the peripheral part encompassing the set of edges, the central part and the peripheral part being flexibly joined together and when the first wall element, the second wall element, the third wall element and the fourth wall element define the contracted state, the peripheral part assuming an inwardly oriented position, whereas when the first wall element, the second wall element, the third wall element and the fourth wall element define the expanded state, the peripheral part assuming an outwardly oriented position. 
     In order to simplify the overlapping of the wall elements and allow the gap between adjacent wall elements to be minimized, the wall elements may be partially flexible. Although it is fully feasible to realize an expansion and contraction of the pelt board according to the first and second aspects of the present invention via the wall element using rigid wall elements, the thickness of the wall element will typically prevent a fully flush outwardly oriented surface in the expanded state. By allowing the part of the wall element which is going to be pushed below and/or above an adjacent wall element in the contracted state to be flexible in relation to the part of the wall element which is going to remain exposed to the pelt, the longitudinal edges of adjacent wall elements may be caused to be fully flush or continuous in the expanded state. 
     The central part of the respective wall element is movable in the respective first radial direction or the second radial direction according to the movement of the corresponding wall element, whereas the peripheral part may be movable in both the first and the second radial direction in order to be accommodated above or below the adjacent wall element as described above. 
     According to further embodiments of the pelt board according to the first and second aspects of the present invention, the first actuator member and the second actuator member constitute pins and the first cooperating member and the second cooperating member constitute grooves, e.g. linear or curved grooves, in which the pins are guided between the contracted state and the expanded state, or, wherein the first cooperating member and the second cooperating member constitute pins and the first actuator member and the second actuator member constitute grooves, e.g. linear or curved grooves, in which the pins are guided between the contracted state and the expanded state. 
     The above guiding principle using a pin which is guided by a groove allows a well defined movement of the wall elements. It is evident that the opposite configuration is equally feasible, i.e. having the first actuator member and the second actuator member constitute grooves, e.g. linear or curved grooves, and the first cooperating member and the second cooperating member constitute pins which are guided by the grooves between the contracted state and the expanded state, or any combination thereof. The longitudinal movement of the elongated core thus translates into a radial movement of the wall elements. The groove/pin configuration also allows for a very convenient latching of the wall elements and the core. 
     According to further embodiments of the pelt board according to the first and second aspects of the present invention, the third actuator member and the fourth actuator member constitute wedge members for contacting the third cooperating member and the fourth cooperating member, or, the third cooperating member and the fourth cooperating member constitute wedge members for contacting the third actuator member and the fourth actuator member. 
     Another guiding principle is employed by using wedge members which exhibit an angle and may consequently slide outwardly when pushed. The longitudinal movement of the elongated core element thus translates into a radial movement by interaction between the sloped members. This guiding principle may preferably be used when changing from the contracted state to the expanded state. 
     According to further embodiments of the pelt board according to the first and second aspects of the present invention, the third actuator member and the fourth actuator members further engage the cooperating members opposite the elongated core element. 
     Yet another guiding principle is employed by using actuator members acting on the side of the elongated core element which is located opposite the wall element to be moved. The longitudinal movement of the elongated core element thus translates into a radial movement by interaction typically by using sloped members. This guiding principle may preferably be used when changing from the expanded state to the contracted state. 
     According to further embodiments of the pelt board according to the first and second aspects of the present invention, any of the first wall element, second wall element, third wall element and fourth wall element have an arched shape such that any of the first outwardly oriented surface, second outwardly oriented surface, third outwardly oriented surface and fourth outwardly oriented surface define a convex shape. 
     Using a convex shape of the wall element will allow the outer surfaces of the wall elements to adapt to the pelt which typically has a cylindrical shape. 
     According to further embodiments of the pelt board according to the first and second aspects of the present invention, any of the first wall element, second wall element, third wall element and fourth wall element comprise ventilation grooves between the cavity and the outside of the pelt board according to the first and second aspects of the present invention. 
     Ventilation grooves may be present in order to allow dry air to be injected into the pelt for removing any remaining moisture in the pelt and thereby decrease the drying time of the pelt. 
     According to further embodiments of the pelt board according to the first and second aspects of the present invention, the first wall element, the second wall element, the third wall element and the fourth wall element define an opening between the cavity and the outside of the pelt board according to the first and second aspects of the present invention at the bottom end for allowing ventilation air to enter the cavity. 
     The dry air injected into the pelt via the pelt board according to the first and second aspects of the present invention and used for decreasing the drying time of the pelt may be let into the pelt board according to the first and second aspects of the present invention via a cavity near the bottom end of the pelt board according to the first and second aspects of the present invention. The bottom end of the pelt board according to the first and second aspects of the present invention is typically attachable to a drying unit for holding the pelt board according to the first and second aspects of the present invention in an upright position and for supplying the drying air. 
     According to further embodiments of the pelt board according to the first and second aspects of the present invention, the third wall element and the fourth wall element are fixedly connected at the bottom end. 
     In order to increase the rigidity of the pelt board according to the first and second aspects of the present invention and for allowing the pelt board according to the first and second aspects of the present invention to easily connect to a drying unit, the pelt board according to the first and second aspects of the present invention may assume the same circumference at the bottom end both in the expanded state and in the contracted state. This may be made by fixedly connecting the wall elements at constant distance relative to each other near the bottom end and allowing the flexibility of the wall elements to determine the movement of the lower portion of the pelt board according to the first and second aspects of the present invention. The lower extreme of the pelt board according to the first and second aspects of the present invention is typically not used for accommodating the pelt since the pelt boards according to the present invention are typically made longer than the longest pelts for which the pelt boards are intended. 
     According to further embodiments of the pelt board according to the first and second aspects of the present invention, the first wall element defines a first radial edge adjacent the top end of the elongated core, the second wall element comprising a second radial edge adjacent the top edge of the elongated core, the pelt board according to the first and second aspects of the present invention further comprising:
         a fifth wall element adjacent to the first wall element at the first radial edge, the fifth wall element extending along the longitudinal direction and away from the second wall element, the fifth wall element defining a fifth outwardly oriented surface and a fifth actuator member,   a sixth wall element adjacent to the second wall element at the second radial edge, the sixth wall element extending along the longitudinal direction and away from the second wall element, the sixth wall element defining a sixth outwardly oriented surface and a sixth actuator member, the fifth and sixth wall elements being spaced apart in the first radial direction, and   a core extension element connected to the top end of the elongated core element and extending along the longitudinal direction away from the elongated core element, the core extension element being movable in relation to the fifth wall element and sixth wall element, the core extension element comprising a fifth cooperating member interacting with the fifth actuator member of the fifth wall element and a sixth cooperating member interacting with the sixth actuator member of the sixth wall element for allowing the fifth wall element and the sixth wall element to change between the contracted state and the expanded states by moving the elongated core element and the core extension element in the longitudinal direction relative to the first wall element, the second wall element, the third wall element, the fourth wall element, the fifth wall element and the sixth wall element.       

     Although it is sometimes feasible, having a pelt board according to the first and second aspects of the present invention which is expandable along its entire circumference may be undesirable near the upper part of the pelt board according to the first and second aspects of the present invention. The upper part of the pelt board according to the first and second aspects of the present invention is intended to accommodate the neck and head part of the animal and since the neck and head part of the animal pelt have a smaller circumference than the body part of the pelt, the pelt board according to the first and second aspects of the present invention usually is tapered towards the top end having a thickness of the pelt board according to the first and second aspects of the present invention which is reduced near the top of the pelt board according to the first and second aspects of the present invention, as described above. Since the actuator members, cooperating members and elongated core element require some space within the cavity, it may not be feasible to allow the pelt board according to the first and second aspects of the present invention to expand and contract along its entire circumference, i.e. a four way expansion of the pelt board according to the first and second aspects of the present invention as described above, at the top end of the board. Instead, at the top end of the board, the pelt board according to the first and second aspects of the present invention may be allowed to be movable in only two opposing directions. 
     The fifth wall element constitutes an extension of the first wall element, the sixth wall element constitutes an extension of the second wall element, whereas the core extension element constitutes and extension of the elongated core element. The moving principle in the first radial direction of the fifth wall element, sixth wall element and core extension element may be the same between the first wall element, the second wall element and the elongated core element, albeit the adjacent wall elements moving in the second radial direction are missing. This top structure including the fifth wall element and the sixth wall element may thus be made significantly thinner than the bottom structure including the first wall element, the second wall element, the third wall element, the fourth wall element. The fifth wall element and the sixth wall element may optionally be arched but will typically be substantially flat due to the limited space available at the top of the pelt board according to the first and second aspects of the present invention. 
     According to further embodiments of the pelt board according to the first and second aspects of the present invention, the third wall element and the fourth wall element comprise opposing extension elements partially enclosing the core extension element. 
     In order to increase the rigidity of the top structure relative to the bottom structure, the top structure may include opposing extension elements which limit the radial movement or flexibility of the core extension element. The core extension element is thus located between the opposing extension elements, which are fixated to the respective third wall element and the fourth wall element. 
     According to further embodiments of the pelt board according to the first and second aspects of the present invention, the pelt board according to the first and second aspects of the present invention comprises:
         a lower section including the first wall element, the second wall element, the third wall element, the fourth wall element and the elongated core element,   an upper section comprising the fifth wall element, the sixth wall element and the core extension element, and   an intermediate section located between the lower section and the upper section and comprising a core connecting element interconnecting the elongated core element and the core extension element, and a number of substantially elliptic cylindrical elements surrounding the core connecting element.       

     The substantially elliptic cylindrical elements may be used for extending a short pelt board according to the first and second aspects of the present invention and make it suitable for larger animals. The substantially elliptic cylindrical elements typically do not have any variable circumference, however, the pelt typically sticks to the pelt board according to the first and second aspects of the present invention near the top and bottom ends of the pelt board according to the first and second aspects of the present invention, thus the elliptic cylindrical elements merely constitutes spacers. This will have the advantage that the same pelt board according to the first and second aspects of the present invention may be used with animals of very different size and the adaptation to the size of the particular animal will be made by using the elliptic cylindrical elements. The core connecting element is merely used for connecting the longitudinal motion from the elongated core element to the core extension element. 
     According to further embodiments of the pelt board according to the first and second aspects of the present invention, the fifth cooperating member and the sixth cooperating member constitute pins and the fifth actuator member and the sixth actuator member constitute grooves, e.g. linear or curved grooves, in which the pins are guided between the contracted state and the expanded state, or, the fifth actuator member and the sixth actuator member constitute pins and the fifth cooperating member and the sixth cooperating member constitute grooves, e.g. linear or curved grooves, in which the pins are guided between the contracted state and the expanded state 
     The above guiding principle using a pin which is guided by a groove allows a well defined movement of the wall elements. This principle has been explained above in connection with the first and second actuator members. 
     According to further embodiments of the pelt board according to the first and second aspects of the present invention, the fifth wall element is connected to the first wall element at the first radial edge and the sixth wall element is connected to the second wall element at the second radial edge. 
     By connecting the fifth wall element to the first wall element at the first radial edge and connecting the sixth wall element to the second wall element at the second radial edge, it may be assured that the fifth wall element and the sixth wall element moves uniformly and synchronous with the respective first wall element and second wall element. It may also be avoided that the pelt is squeezed in-between the wall element and the arched wall elements at the first and second radial edges. 
     According to further embodiments of the pelt board according to the first and second aspects of the present invention, the elongated core element comprises a first protrusion adjacent the bottom end, the elongated core element being spring-loaded at the bottom end and defining a centralized relaxed position and a non-centralized loaded position in the first radial direction and/or second radial direction, the first wall element, the second wall element, the third wall element or the fourth wall element comprise a second protrusion cooperating with the first protrusion such that when the first wall element, the second wall element, the third wall element and the fourth wall element define the expanded state and the elongated core element defines the centralized related position, the first and second protrusions prevent any longitudinal movement of the elongated core element, whereas when the elongated core element defines the non-centralized loaded position, the first and second protrusions allow longitudinal movement of the elongated core element. 
     The pelt board according to the first and second aspects of the present invention is maintained in the expanded state merely due to the design of and internal friction between the movable parts of the pelt board according to the first and second aspects of the present invention. The friction increases with the pressure applied to the pelt board according to the first and second aspects of the present invention and although an increased friction may help keeping the pelt board according to the first and second aspects of the present invention in the expanded state also when a large inwardly pressure is applied from the pelt, it may also be very difficult to contract the pelt board according to the first and second aspects of the present invention. Experience has shown that after the drying, when the pelt has shrunk and thus applies a large pressure onto the pelt board according to the first and second aspects of the present invention, the users have to apply a large manual force to cause the pelt board according to the first and second aspects of the present invention to collapse. This work is very tedious and may lead to work related injuries. 
     The locking mechanism described above making use of cooperating protrusions for preventing movement of the elongated core element and thereby contraction of the pelt board according to the first and second aspects of the present invention allows the pelt board according to the first and second aspects of the present invention to remain in the expanded state even when exposed to very large inwardly oriented pressure, while reducing the amount of work needed for changing the pelt board according to the first and second aspects of the present invention into the contracted state. The first and second protrusions will interlock when the elongated core is in its central position, effectively preventing any longitudinal movement of the elongated core, which in turn prevents any radial movement of the wall elements. 
     By merely exposing the elongated core element to a small radial force, overcoming the friction between the first and second protrusion and the spring constant of the elongated core element, the inwardly oriented pressure from the dried pelt will cause the wall element to move inwardly and the pelt board according to the first and second aspects of the present invention to contact, while the elongated core element is moved in the longitudinal direction and the first protrusion is passing by the second protrusion. This mechanism will also be less prone to accidental activation since it is not depending on any hard to determine internal friction between the activation members and the cooperating members. 
     It is evident that the above locking mechanism may be used for a generic pelt board according to the first and second aspects of the present invention which does not necessarily have to encompass the four way expansion. Such pelt board according to the first and second aspects of the present invention may e.g. be defined as an elongated pelt board according to the first and second aspects of the present invention for accommodating an animal pelt, the pelt board according to the first and second aspects of the present invention defining a longitudinal direction, a first radial direction perpendicular to the longitudinal direction and a second radial direction perpendicular to the longitudinal direction and the first radial direction, the pelt board according to the first and second aspects of the present invention having a wall element and an elongated core element covered by the wall element, the wall element being capable of assuming an expanded state and a contacted state by longitudinal movement of the elongated core element, the elongated core element comprising a first protrusion adjacent a bottom end of the pelt board according to the first and second aspects of the present invention, the core element being spring-loaded at the bottom end and defines a centralized relaxed position and a non-centralized loaded position in the first radial direction and/or second radial direction, the wall element comprising a second protrusion cooperating with the first protrusion such that when the wall element define the expanded state and the elongated core element define the centralized related position, the first and second protrusions preventing any longitudinal movement of the elongated core element, whereas when the elongated core element define the non-centralized loaded position, the first and second protrusions allow longitudinal movement of the elongated core element. 
     The change from expanded state to contracted state may preferably be made when the bottom end of the elongated core element is attached to the drying unit, e.g. by tilting the pelt board according to the first and second aspects of the present invention sideways, thereby also taking advantage of the leverage provided by the pelt board according to the first and second aspects of the present invention for overcoming the friction between the first and second protrusions. 
     According to two further advantageous embodiments of the pelt board according to the second aspect of the present invention, the pelt board according to the second aspect of the present invention is adapted to establish an intermediate position in which the first wall element and the second wall element, or alternatively, the third wall element and the fourth wall element, are shifted relative to one another for establishing a first intermediate state and a second intermediate state, respectively. 
     Consequently, according to a first alternative embodiment of the pelt board according to the second aspect of the present invention, the first wall element, the second wall element, the third wall element and the fourth wall element further define a first intermediate state in which the first radial distance between the first inwardly orientated surface and the second inwardly orientated surface is increased, as compared to the contracted state. 
     According to a second alternative embodiment of the pelt board according to the second aspect of the present invention, the first wall element, the second wall element, the third wall element and the fourth wall element further define a second intermediate state, in which the second radial distance between the third inwardly orientated surface and the fourth inwardly orientated surface is increased, as compared to the contracted state. 
     Although the elongated pelt board according to the second aspect of the present invention may, according to the above described two alternative embodiments, in which a first and a second intermediate state, respectively, are defined, the elongated pelt board according to the second aspect of the present invention may be adapted to allow the change from the contracted state to the expanded state and vice versa via the first intermediate state, or alternatively via the second intermediate state, or by directly shifting the elongated pelt board according to the second aspect of the present invention from the contracted state to the expanded state or in the alternative, when collapsing the elongated pelt board according to the second aspect of the present invention from the expanded state to the contracted state. 
     In a variant of the elongated pelt board according to the second aspect of the present invention, the first and second wall elements and likewise the third and fourth wall elements are integrated into integral wall element structures and consequently, according to this alternative embodiment, the first wall element defines a first edge among the first set of oppositely located longitudinal edges and the second wall element defines a second edge among the second set of oppositely located longitudinal edges, the first and second edges being positioned adjacent one another, and the first wall element and the second wall element being integrally connected along the first and second edges, and the third wall element defines a third edge among the third set of oppositely located longitudinal edges, and the fourth wall element defines a fourth edge among the fourth set of oppositely located longitudinal edges, the third and fourth edges being positioned adjacent one another, and the third wall element and the fourth wall element being integrally connected along the third and fourth edges. 
     In the alternative embodiment of the pelt board according to the second aspect of the present invention, in which the first and second wall elements and likewise the third and fourth wall elements are integrated into integral wall elements, the first actuator member and the second actuator member are constituted by a single first integral actuator member, and the third actuator member and the fourth actuator member are constituted by a single second integral actuator member. 
     The above object, the above features and the above advantage together with numerous other objects, advantages and features, which will be evident from the below detailed description of the present invention, are according to a third aspect of the present invention obtained by an elongated pelt board for accommodating an animal pelt, the pelt board defining a longitudinal direction, a first radial direction perpendicular to the longitudinal direction and a second radial direction perpendicular to the longitudinal direction and the first radial direction, the pelt board comprising:
         a first wall element extending along the longitudinal direction and defining a first outwardly oriented surface, a first inwardly oriented surface, a first set of oppositely located longitudinal edges and a first actuator member,   a second wall element extending along the longitudinal direction and defining a second outwardly oriented surface, a second inwardly oriented surface facing the first inwardly oriented surface, a second set of oppositely located longitudinal edges and a second actuator member,   the first wall element and the second wall element being of identical configuration and each having a low curvature part and a high curvature part joint together along a line of junction extending generally in the longitudinal direction,   the low curvature part of the first wall element defining a first longitudinal edge of the first set of oppositely located longitudinal edges, the high curvature part of the first wall element defining a second longitudinal edge of the first set of oppositely located longitudinal edges, the low curvature part of the second wall element defining a first longitudinal edge of the second set of oppositely located longitudinal edges, the high curvature part of the second wall element defining a second longitudinal edge of the second set of oppositely located longitudinal edges, the first edge of the first wall element being positioned juxtaposed the second edge of the second wall element and the first edge of the second wall element being positioned juxtaposed the second edge of the first wall element, the first inwardly oriented surface and the second inwardly oriented surface together defining a cavity along the longitudinal direction,   the first wall element and the second wall element defining:   a contracted state in which the first radial distance between the first inwardly oriented surface and the second inwardly oriented surface is reduced, in which the first edge of the first wall element is positioned closely against the second edge of the second wall element, and in which the first edge of the second wall element is positioned closely against the second edge of the first wall element, and   an expanded state in which the first radial distance between the first inwardly oriented surface and the second inwardly oriented surface is increased, in which the first edge of the first wall element and the second edge of the second wall element is positioned in spaced apart relationship in the first radial direction, and in which the first edge of the second wall element and the second edge of the first wall element are positioned in spaced apart relationship and the first radial direction and   an elongated core element extending within the cavity along the longitudinal direction between a top end and a bottom end and being movable in relation to the first wall element and second wall element, the elongated core element comprising a first cooperating member interacting with the first actuator member of the first wall element and second cooperating member interacting with the second actuator member of the second wall element, for allowing the first wall element and the second wall element, to selectively define the contracted state or the expanded state by moving the elongated core element in the longitudinal direction relative to the first wall element and the second wall element.       

     The above object, the above features and the above advantage together with numerous other objects, advantages and features, which will be evident from the below detailed description of the present invention, are according to a fourth aspect of the present invention obtained by an elongated pelt board for accommodating an animal pelt, the pelt board defining a longitudinal direction, a first radial direction perpendicular to the longitudinal direction and a second radial direction perpendicular to the longitudinal direction and the first radial direction, the pelt board comprising: 
     a first wall element extending along the longitudinal direction and defining a first outwardly oriented surface, a first inwardly oriented surface, a first set of oppositely located longitudinal edges and a first actuator member, 
     
         
         
           
             a second wall element extending along the longitudinal direction and defining a second outwardly oriented surface, a second inwardly oriented surface facing the first inwardly oriented surface, a second set of oppositely located longitudinal edges and a second actuator member, 
             the first wall element and the second wall element being of identical configuration and each having a low curvature part and a high curvature part joint together along a line of junction extending generally in the longitudinal direction, 
             the low curvature part of the first wall element defining a first longitudinal edge of the first set of oppositely located longitudinal edges, the high curvature part of the first wall element defining a second longitudinal edge of the first set of oppositely located longitudinal edges, the low curvature part of the second wall element defining a first longitudinal edge of the second set of oppositely located longitudinal edges, the high curvature part of the second wall element defining a second longitudinal edge of the second set of oppositely located longitudinal edges, the first edge of the first wall element being positioned juxtaposed the second edge of the second wall element and the first edge of the second wall element being positioned juxtaposed the second edge of the first wall element, the first inwardly oriented surface and the second inwardly oriented surface together defining a cavity along the longitudinal direction, 
             the first wall element and the second wall element defining: 
             a contracted state in which the first radial distance between the first inwardly oriented surface and the second inwardly oriented surface is reduced, in which the first edge of the first wall element is positioned closely against the second edge of the second wall element, and in which the first edge of the second wall element is positioned closely against the second edge of the first wall element, and 
             an expanded state in which the first radial distance between the first inwardly oriented surface and the second inwardly oriented surface is increased, in which the first edge of the first wall element and the second edge of the second wall element is positioned in spaced apart relationship in the second radial direction, and in which the first edge of the second wall element and the second edge of the first wall element are positioned in spaced apart relationship and the second radial direction, and 
             an elongated core element extending within the cavity along the longitudinal direction between a top end and a bottom end and being movable in relation to the first wall element and second wall element, the elongated core element comprising a first cooperating member interacting with the first actuator member of the first wall element and second cooperating member interacting with the second actuator member of the second wall element, for allowing the first wall element and the second wall element, to selectively define the contracted state or the expanded state by moving the elongated core element in the longitudinal direction relative to the first wall element and the second wall element. 
           
         
       
    
     The pelt board according to the third and fourth aspects of the present invention should have an overall size which is suitable for accommodating a pelt of an animal such as a mink or fox. The pelt board according to the third and fourth aspects of the present invention typically has a substantially elliptic cylindrical shape which is tapering in the longitudinal direction. The pelt is applied onto the pelt board according to the third and fourth aspects of the present invention by drawing in onto the pelt board according to the third and fourth aspects of the present invention in the longitudinal direction, while the pelt board according to the third and fourth aspects of the present invention assumes its expanded state. It is understood that state of the art pelt bags may be used between the pelt and the pelt board according to the third and fourth aspects of the present invention in order to remove fatty substances from the pelt. The wall elements typically include a large number of holes or nozzles for allowing ventilation air to pass from the cavity within the pelt board according to the third and fourth aspects of the present invention to the outside through the pelt. 
     The first and second wall elements together define the substantially elliptical outer circumference of the pelt board according to the third and fourth aspects of the present invention, which is suitable for and adapted for accommodating a pelt of an animal, through its respective outwardly oriented surfaces. The inwardly oriented surfaces may preferably define a concave shape, which surfaces together define the cavity in the pelt board according to the third and fourth aspects of the present invention. The wall elements are typically made of plastics. The wall elements are further delimited in the circumferential direction by longitudinal edges. 
     The elongated core element, which is located in the cavity, is movable in the longitudinal direction in relation to the wall elements. The actuator members of the wall elements and the cooperating members of the core element interact when the core element is moved in the longitudinal direction within the cavity. The cooperating members move in the longitudinal direction together with the elongated core whereas the actuator members move in any of the radial directions along with its respective wall element. The interaction between the cooperating members and the actuator members translate the longitudinal movement of the cooperating members to a radial movement of the actuator members. 
     The actuator members and the cooperating members thus cause the wall elements to move towards each other or away from each other in the respective first or second radial direction, thus making the cavity smaller or larger, when the core element is moved in the longitudinal direction relative to the wall elements. The wall elements are thus movable between the contacted state, in which the wall elements have moved towards each other, reducing the radial distances, and consequently the circumference of the pelt board according to the third and fourth aspects of the present invention and the cavity is small, and an expanded state in which the wall elements have moved away from each other, increasing the radial distances and consequently the circumference of the pelt board according to the third and fourth aspects of the present invention and the cavity is large. 
     Typically, an upward movement of the elongated core element in relation to the wall elements yields an expansion of the circumference of the pelt board according to the third and fourth aspects of the present invention, whereas a downward movement of the elongated core element in relation to the wall elements yields a contraction of the circumference of the pelt board according to the third and fourth aspects of the present invention. 
     The outer surface of the wall elements will constitute the contacts surface between the pelt and the pelt board according to the third and fourth aspects of the present invention, not taking into account the optional presence of a pelt bag between the pelt and the pelt board according to the third and fourth aspects of the present invention. 
     When in the expanded state, the circumference of the pelt board according to the third and fourth aspects of the present invention is large. In this state the pelt is applied to the pelt board according to the third and fourth aspects of the present invention, optionally using a pelt bag. During the drying process, the pelt looses fat and moist and consequently contracts slightly. It may thereafter be very difficult to remove the pelt from the board. By contacting the pelt board according to the third and fourth aspects of the present invention by moving the wall element towards each other, the circumference of the pelt board according to the third and fourth aspects of the present invention defined by the outer surface of the wall elements will be smaller and thus allow the pelt to loosen from the outer surfaces of the wall elements, such that the pelt may be removed from the pelt board according to the third and fourth aspects of the present invention. In this context, the complete circumference of the pelt board according to the third and fourth aspects of the present invention will contract, effectively eliminating the risk of the pelt sticking to the pelt board according to the third and fourth aspects of the present invention. 
     In order to simplify the overlapping of the wall elements and allow the gap between adjacent wall elements to be minimized, the wall elements may be partially flexible. Although it is fully feasible to realize an expansion and contraction of the pelt board according to the third and fourth aspects of the present invention via the wall element using rigid wall elements, the thickness of the wall element will typically prevent a fully flush outwardly oriented surface in the expanded state. By allowing the part of the wall element which is going to be pushed below and/or above an adjacent wall element in the contracted state to be flexible in relation to the part of the wall element which is going to remain exposed to the pelt, the longitudinal edges of adjacent wall elements may be caused to be fully flush or continuous in the expanded state. 
     According to a further embodiment of the pelt board according to the third and fourth aspects of the present invention, the first actuator member and the second actuator member constitute pins and the first cooperating member and the second cooperating member constitute grooves, e.g. linear or curved grooves, in which the pins are guided between the contracted state and the expanded state, or, wherein the first cooperating member and the second cooperating member constitute pins and the first actuator member and the second actuator member constitute grooves, e.g. linear or curved grooves, in which the pins are guided between the contracted state and the expanded state. 
     The above guiding principle using a pin which is guided by a groove allows a well defined movement of the wall elements. It is evident that the opposite configuration is equally feasible, i.e. having the first actuator member and the second actuator member constitute grooves, e.g. linear or curved grooves, and the first cooperating member and the second cooperating member constitute pins which are guided by the grooves between the contracted state and the expanded state, or any combination thereof. The longitudinal movement of the elongated core thus translates into a radial movement of the wall elements. The groove/pin configuration also allows for a very convenient latching of the wall elements and the core. 
     Another guiding principle is employed by using wedge members which exhibit an angle and may consequently slide outwardly when pushed. The longitudinal movement of the elongated core element thus translates into a radial movement by interaction between the sloped members. This guiding principle may preferably be used when changing from the contracted state to the expanded state. 
     Yet another guiding principle is employed by using actuator members acting on the side of the elongated core element which is located opposite the wall element to be moved. The longitudinal movement of the elongated core element thus translates into a radial movement by interaction typically by using sloped members. This guiding principle may preferably be used when changing from the expanded state to the contracted state. 
     According to a further embodiment according to the present invention, the first wall element and the second wall element have an arched shape such that the first outwardly oriented surface and the second outwardly oriented surface define a convex shape. 
     Using a convex shape of the wall element will allow the outer surfaces of the wall elements to adapt to the pelt which typically has a cylindrical shape. 
     According to a further embodiment according to the present invention, the first wall element and the second wall element comprise ventilation grooves between the cavity and the outside of the pelt board according to the third and fourth aspects of the present invention. 
     Ventilation grooves may be present in order to allow dry air to be injected into the pelt for removing any remaining moisture in the pelt and thereby decrease the drying time of the pelt. 
     According to a further embodiment according to the present invention, the first wall element and the second wall element define an opening between the cavity and the outside of the pelt board according to the third and fourth aspects of the present invention at the bottom end for allowing ventilation air to enter the cavity. 
     The dry air injected into the pelt via the pelt board according to the third and fourth aspects of the present invention and used for decreasing the drying time of the pelt may be let into the pelt board according to the third and fourth aspects of the present invention via a cavity near the bottom end of the pelt board according to the third and fourth aspects of the present invention. The bottom end of the pelt board according to the third and fourth aspects of the present invention is typically attachable to a drying unit for holding the pelt board according to the third and fourth aspects of the present invention in an upright position and for supplying the drying air. 
     In accordance with the presently preferred embodiment of the elongated pelt board according to the third and fourth aspects of the present invention according to the first and the second aspect of the present invention, the first wall element and the third wall element are constituted by a first unitary structure, the second wall element and the fourth wall element are constituted by a second unitary structure and the core element and the core extension element are constituted by a second unitary core element structure. 
     Consequently, this presently preferred embodiment of the pelt board according to the third and fourth aspects of the present invention according to the first and the second aspect of the present invention is assembled from three separate elements, namely a single unitary core element structure and two identically shaped unitary wall element structures. 
     In order to increase the rigidity of the pelt board according to the third and fourth aspects of the present invention and for allowing the pelt board according to the third and fourth aspects of the present invention to easily connect to a drying unit, the pelt board according to the third and fourth aspects of the present invention may assume the same circumference at the bottom end both in the expanded state and in the contracted state. This may be made by fixedly connecting the wall elements at constant distance relative to each other near the bottom end and allowing the flexibility of the wall elements to determine the movement of the lower portion of the pelt board according to the third and fourth aspects of the present invention. The lower extreme of the pelt board according to the third and fourth aspects of the present invention is typically not used for accommodating the pelt since the pelt board according to the third and fourth aspects of the present invention is typically made longer than the longest pelts for which the pelt board according to the third and fourth aspects of the present invention is intended. 
     According to a further embodiment of the pelt board according to the third and fourth aspects of the present invention, the first wall element defines a first radial edge adjacent the top end of the elongated core, the second wall element comprising a second radial edge adjacent the top edge of the elongated core, the pelt board further comprising:
         a third wall element adjacent to the first wall element at the first radial edge, the third wall element extending along the longitudinal direction and away from the second wall element, the third wall element defining a third outwardly oriented surface and a third actuator member,   a fourth wall element adjacent to the second wall element at the second radial edge, the fourth wall element extending along the longitudinal direction and away from the second wall element, the fourth wall element defining a fourth outwardly oriented surface and a fourth actuator member, the third and fourth wall elements being spaced apart in the first radial direction, and   a core extension element connected to the top end of the elongated core element and extending along the longitudinal direction away from the elongated core element, the core extension element being movable in relation to the third wall element and fourth wall element, the core extension element comprising a third cooperating member interacting with the third actuator member of the third wall element and a fourth cooperating member interacting with the fourth actuator member of the fourth wall element for allowing the third wall element and the fourth wall element to change between the contracted state and the expanded states by moving the elongated core element and the core extension element in the longitudinal direction relative to the first wall element, the second wall element, the third wall element, the fourth wall element, the third wall element and the fourth wall element.       

     Although it is sometimes feasible, having a pelt board which is expandable along its entire circumference may be undesirable near the upper part of the pelt board according to the third and fourth aspects of the present invention. The upper part of the pelt board is intended to accommodate the neck and head part of the animal and since the neck and head part of the animal pelt have a smaller circumference than the body part of the pelt, the pelt board usually is tapered towards the top end having a thickness of the pelt board which is reduced near the top of the pelt board, as described above. Since the actuator members, cooperating members and elongated core element require some space within the cavity, it may not be feasible to allow the pelt board to expand and contract along its entire circumference, at the top end of the board. 
     According to a further embodiment of the pelt board according to the third and fourth aspects of the present invention, the third wall element and the fourth wall element comprise opposing extension elements partially enclosing the core extension element. 
     According to a further embodiment of the pelt board according to the third and fourth aspects of the present invention, the pelt board comprises:
         a lower section including the first wall element and the second wall element and the elongated core element,   an upper section comprising the third wall element, the fourth wall element and the core extension element, and   an intermediate section located between the lower section and the upper section and comprising a core connecting element interconnecting the elongated core element and the core extension element.       

     According to a further embodiment of the pelt board according to the third and fourth aspects of the present invention, the third cooperating member and the fourth cooperating member constitute pins and the third actuator member and the fourth actuator member constitute grooves, e.g. linear or curved grooves, in which the pins are guided between the contracted state and the expanded state, or, the third actuator member and the fourth actuator member constitute pins and the third cooperating member and the fourth cooperating member constitute grooves, e.g. linear or curved grooves, in which the pins are guided between the contracted state and the expanded state. 
     The above guiding principle using a pin which is guided by a groove allows a well defined movement of the wall elements. This principle has been explained above in connection with the first and second actuator members. 
     According to a further embodiment of the pelt board according to the third and fourth aspects of the present invention, the third wall element is connected to the first wall element at the first radial edge and the fourth wall element is connected to the second wall element at the second radial edge. 
     By connecting the third wall element to the first wall element at the first radial edge and connecting the fourth wall element to the second wall element at the second radial edge, it may be assured that the third wall element and the fourth wall element moves uniformly and synchronous with the respective first wall element and second wall element. It may also be avoided that the pelt is squeezed in-between the wall element and the arched wall elements at the first and second radial edges. 
     According to a further embodiment of the pelt board according to the third and fourth aspects of the present invention, the elongated core element comprises a first protrusion adjacent the bottom end, the elongated core element being spring-loaded at the bottom end and defining a centralized relaxed position and a non-centralized loaded position in the first radial direction and/or second radial direction, the first wall element and the second wall element comprise a second protrusion cooperating with the first protrusion such that when the first wall element and the second wall element define the expanded state and the elongated core element defines the centralized related position, the first and second protrusions prevent any longitudinal movement of the elongated core element, whereas when the elongated core element defines the non-centralized loaded position, the first and second protrusions allow longitudinal movement of the elongated core element. 
     The pelt board according to the third and fourth aspects of the present invention is maintained in the expanded state merely due to the design of and internal friction between the movable parts of the pelt board. The friction increases with the pressure applied to the pelt board and although an increased friction may help keeping the pelt board in the expanded state also when a large inwardly pressure is applied from the pelt, it may also be very difficult to contract the pelt board. Experience has shown that after the drying, when the pelt has shrunk and thus applies a large pressure onto the pelt board, the users have to apply a large manual force to cause the pelt board to collapse. This work is very tedious and may lead to work related injuries. 
     The locking mechanism described above making use of cooperating protrusions for preventing movement of the elongated core element and thereby contraction of the pelt board allows the pelt board to remain in the expanded state even when exposed to very large inwardly oriented pressure, while reducing the amount of work needed for changing the pelt board into the contracted state. The first and second protrusions will interlock when the elongated core is in its central position, effectively preventing any longitudinal movement of the elongated core, which in turn prevents any radial movement of the wall elements. 
     By merely exposing the elongated core element to a small radial force, overcoming the friction between the first and second protrusion and the spring constant of the elongated core element, the inwardly oriented pressure from the dried pelt will cause the wall element to move inwardly and the pelt board to contact, while the elongated core element is moved in the longitudinal direction and the first protrusion is passing by the second protrusion. This mechanism will also be less prone to accidental activation since it is not depending on any hard to determine internal friction between the activation members and the cooperating members. 
     It is evident that the above locking mechanism may be used for a generic pelt board which does not necessarily have to encompass the four way expansion. Such pelt board may e.g. be defined as an elongated pelt board for accommodating an animal pelt, the pelt board defining a longitudinal direction, a first radial direction perpendicular to the longitudinal direction and a second radial direction perpendicular to the longitudinal direction and the first radial direction, the pelt board having a wall element and an elongated core element covered by the wall element, the wall element being capable of assuming an expanded state and a contacted state by longitudinal movement of the elongated core element, the elongated core element comprising a first protrusion adjacent a bottom end of the pelt board, the core element being spring-loaded at the bottom end and defines a centralized relaxed position and a non-centralized loaded position in the first radial direction and/or second radial direction, the wall element comprising a second protrusion cooperating with the first protrusion such that when the wall element define the expanded state and the elongated core element define the centralized related position, the first and second protrusions preventing any longitudinal movement of the elongated core element, whereas when the elongated core element define the non-centralized loaded position, the first and second protrusions allow longitudinal movement of the elongated core element. 
     The change from expanded state to contracted state may preferably be made when the bottom end of the elongated core element is attached to the drying unit, e.g. by tilting the pelt board sideways, thereby also taking advantage of the leverage provided by the pelt board for overcoming the friction between the first and second protrusions. 
     The above object, the above features and the above advantage together with numerous other objects, advantages and features which will be evident from the below detailed description of the present invention are according to a fifth aspect of the present invention obtained by a method of manufacturing a pelt board for accommodating an animal pelt, the method comprising:
         providing a first wall element defining a first outwardly oriented surface, a first inwardly oriented surface, a first set of oppositely located longitudinal edges and a first actuator member,   providing a second wall element defining a second outwardly oriented surface, a second inwardly oriented surface, a second set of oppositely located longitudinal edges and a second actuator member,   providing a third wall element defining a third outwardly oriented surface, a third inwardly oriented surface, a third set of oppositely located longitudinal edges and a third actuator member,   providing a fourth wall element defining a fourth outwardly oriented surface, a fourth inwardly oriented surface, a fourth set of oppositely located longitudinal edges and a fourth actuator member,   providing an elongated core element comprising a first cooperating member, a second cooperating member, a third cooperating member and a fourth cooperating member,   positioning the first wall element, the second wall element, the third wall element and the fourth wall element along a longitudinal direction such that the first inwardly oriented surface is facing the second inwardly oriented surface and spaced apart along a first radial direction perpendicular to the longitudinal direction, the third inwardly oriented surface is facing the fourth inwardly oriented surface and spaced apart along a second radial direction perpendicular to the longitudinal direction and the first radial direction such that the first inwardly oriented surface, the second inwardly oriented surface, the third inwardly oriented surface and the fourth inwardly oriented surface together defining a cavity along the longitudinal direction,   interacting the first cooperating member, the second cooperating member, the third cooperating member and the fourth cooperating member with the first actuator member of the first wall element, the second actuator member of the second wall element, the third actuator member of the third wall element and the fourth actuator member of the fourth wall element, respectively, and   moving the elongated core element in the longitudinal direction relative to the first wall element, the second wall element, the third wall element and the fourth wall element thereby causing the first wall element, the second wall element, the third wall element and the fourth wall element to move between a contracted state and an expanded state, when in the contracted state the first radial distance and the second radial distance between the first inwardly oriented surface and the second inwardly oriented surface, and, the third inwardly oriented surface and the fourth inwardly oriented surface, respectively, are reduced, whereas, when in the expanded state the first radial distance and the second radial distance between the first inwardly oriented surface and the second inwardly oriented surface, and, the third inwardly oriented surface and the fourth inwardly oriented surface, respectively, are increased.       

     The above object, the above features and the above advantage together with numerous other objects, advantages and features which will be evident from the below detailed description of the present invention are according to a sixth aspect of the present invention obtained by a method of manufacturing a pelt board for accommodating an animal pelt, the method comprising:
         providing a first wall element defining a first outwardly oriented surface, a first inwardly oriented surface, a first set of oppositely located longitudinal edges and a first actuator member,   providing a second wall element defining a second outwardly oriented surface, a second inwardly oriented surface, a second set of oppositely located longitudinal edges and a second actuator member,   providing a third wall element defining a third outwardly oriented surface, a third inwardly oriented surface, a third set of oppositely located longitudinal edges and a third actuator member,   providing a fourth wall element defining a fourth outwardly oriented surface, a fourth inwardly oriented surface, a fourth set of oppositely located longitudinal edges and a fourth actuator member,   providing an elongated core element comprising a first cooperating member, a second cooperating member, a third cooperating member and a fourth cooperating member,   positioning the first wall element, the second wall element, the third wall element and the fourth wall element along a longitudinal direction such that the first inwardly oriented surface is facing the second inwardly oriented surface and spaced apart along a first radial direction perpendicular to the longitudinal direction, the third inwardly oriented surface is facing the fourth inwardly oriented surface and spaced apart along a second radial direction perpendicular to the longitudinal direction and the first radial direction such that the first inwardly oriented surface, the second inwardly oriented surface, the third inwardly oriented surface and the fourth inwardly oriented surface together defining a cavity along the longitudinal direction,   interacting the first cooperating member, the second cooperating member, the third cooperating member and the fourth cooperating member with the first actuator member of the first wall element, the second actuator member of the second wall element, the third actuator member of the third wall element and the fourth actuator member of the fourth wall element, respectively, and   moving the elongated core element in the longitudinal direction relative to the first wall element, the second wall element, the third wall element and the fourth wall element thereby causing the first wall element, the second wall element, the third wall element and the fourth wall element to move between a contracted state and an expanded state, when in the contracted state the first radial distance and the second radial distance between the first inwardly oriented surface and the second inwardly oriented surface, and, the third inwardly oriented surface and the fourth inwardly oriented surface, respectively, are reduced, whereas, when in the expanded state the first radial distance and the second radial distance between the first inwardly oriented surface and the second inwardly oriented surface, and, the third inwardly oriented surface and the fourth inwardly oriented surface, respectively, are increased.       

     The above object, the above features and the above advantage together with numerous other objects, advantages and features which will be evident from the below detailed description of the present invention are according to a seventh aspect of the present invention obtained by a method of manufacturing a pelt board for accommodating an animal pelt, the method comprising:
         providing a first wall element defining a first outwardly oriented surface, a first inwardly oriented surface, a first set of oppositely located longitudinal edges and a first actuator member,   providing a second wall element defining a second outwardly oriented surface, a second inwardly oriented surface, a second set of oppositely located longitudinal edges and a second actuator member,   the first wall element and the second wall element being of identical configuration and each having a low curvature part and a high curvature part joint together along a line of junction extending generally in the longitudinal direction,   the low curvature part of the first wall element defining a first longitudinal edge of the first set of oppositely located longitudinal edges, the high curvature part of the first wall element defining a second longitudinal edge of the first set of oppositely located longitudinal edges, the low curvature part of the second wall element defining a first longitudinal edge of the second set of oppositely located longitudinal edges, the high curvature part of the second wall element defining a second longitudinal edge of the second set of oppositely located longitudinal edges, the first edge of the first wall element being positioned juxtaposed the second edge of the second wall element and the first edge of the second wall element being positioned juxtaposed the second edge of the first wall element, the first inwardly oriented surface and the second inwardly oriented surface together defining a cavity along the longitudinal direction,   providing an elongated core element comprising a first cooperating member and a second cooperating member,   positioning the first wall element and the second wall element along a longitudinal direction such that the first inwardly oriented surface is facing the second inwardly oriented surface and spaced apart along a first radial direction perpendicular to the longitudinal direction, such that the first inwardly oriented surface and the second inwardly oriented surface together define a cavity along the longitudinal direction,   interacting the first cooperating member and the second cooperating member with the first actuator member of the first wall element and the second actuator member of the second wall element, respectively, and   moving the elongated core element in the longitudinal direction relative to the first wall element and the second wall element causing the first wall element and the second wall element to move between a contracted state in which the first radial distance between the first inwardly oriented surface and the second inwardly oriented surface is reduced, in which the first edge of the first wall element is positioned closely against the second edge of the second wall element, and in which the first edge of the second wall element is positioned closely against the second edge of the first wall element, and   an expanded state in which the first radial distance between the first inwardly oriented surface and the second inwardly oriented surface is increased, in which the first edge of the first wall element and the second edge of the second wall element is positioned in spaced apart relationship in the first radial direction, and in which the first edge of the second wall element and the second edge of the first wall element are positioned in spaced apart relationship and the first radial direction.       

     The above object, the above features and the above advantage together with numerous other objects, advantages and features which will be evident from the below detailed description of the present invention are according to a eighth aspect of the present invention obtained by a method of manufacturing a pelt board for accommodating an animal pelt, the method comprising:
         providing a first wall element defining a first outwardly oriented surface, a first inwardly oriented surface, a first set of oppositely located longitudinal edges and a first actuator member,   providing a second wall element defining a second outwardly oriented surface, a second inwardly oriented surface, a second set of oppositely located longitudinal edges and a second actuator member,   the first wall element and the second wall element being of identical configuration and each having a low curvature part and a high curvature part joint together along a line of junction extending generally in the longitudinal direction,   the low curvature part of the first wall element defining a first longitudinal edge of the first set of oppositely located longitudinal edges, the high curvature part of the first wall element defining a second longitudinal edge of the first set of oppositely located longitudinal edges, the low curvature part of the second wall element defining a first longitudinal edge of the second set of oppositely located longitudinal edges, the high curvature part of the second wall element defining a second longitudinal edge of the second set of oppositely located longitudinal edges, the first edge of the first wall element being positioned juxtaposed the second edge of the second wall element and the first edge of the second wall element being positioned juxtaposed the second edge of the first wall element, the first inwardly oriented surface and the second inwardly oriented surface together defining a cavity along the longitudinal direction,   providing an elongated core element comprising a first cooperating member and a second cooperating member,   positioning the first wall element and the second wall element along a longitudinal direction such that the first inwardly oriented surface is facing the second inwardly oriented surface and spaced apart along a first radial direction perpendicular to the longitudinal direction, such that the first inwardly oriented surface and the second inwardly oriented surface together define a cavity along the longitudinal direction,   interacting the first cooperating member and the second cooperating member with the first actuator member of the first wall element and the second actuator member of the second wall element, respectively, and   moving the elongated core element in the longitudinal direction relative to the first wall element and the second wall element causing the first wall element and the second wall element to move between a contracted state in which the first radial distance between the first inwardly oriented surface and the second inwardly oriented surface is reduced, in which the first edge of the first wall element is positioned closely against the second edge of the second wall element, and in which the first edge of the second wall element is positioned closely against the second edge of the first wall element, and   an expanded state in which the first radial distance between the first inwardly oriented surface and the second inwardly oriented surface is increased, in which the first edge of the first wall element and the second edge of the second wall element is positioned in spaced apart relationship in the second radial direction, and in which the first edge of the second wall element and the second edge of the first wall element are positioned in spaced apart relationship and the first radial direction.       

     The above methods according to the fifth, sixth, seventh and eighth aspects of the present invention may preferably be used together with the pelt board according to the first aspect. The wall elements and the elongated core are preferably made as separate molded plastic items. The wall elements are typically snap fitted together. In some cases, any of the first wall element, the second wall element, the third wall element and the fourth wall element may constitute two or more items which are snap fitted together. 
     In addition to the above described shortcomings of the prior art pelt boards, it has been revealed by the applicant company that the pelt boards and their associated drying units usually embodied as drying boxes exhibit serious drawbacks as to their drying capability. Through experiments, which have been carried out by the applicant company, it has been revealed that a particular drawback of the prior art pelt boards relating to the drying capability has to do with a physical limitation of the air volume, which may be input into the pelt board for establishing the drying of the pelt received and fixated relative to the pelt board, and in view of this realization, it is a further object of the present invention to improve the drying capability of the pelt boards by use of an associated and cooperating drying unit, which together with its pelt board or pelt boards improve the overall drying capability or in the alternative, drying time used for the drying of pelts by use of the pelt boards and the corresponding drying unit. 
     The above objects, the above features and the above advantages together with the above described specific objects of improving the drying capability of the pelt boards and the associated drying units together with numerous other objects, advantages and features will be evident from the below detailed description of the present invention, are according to a ninth aspect of the present invention obtained by a system for drying a pelt, the system comprising a drying unit and a pelt board, the pelt having a substantially tubular shape defining an inwardly oriented leather side and an outwardly oriented fur side and further defining a nose end and a rear end,
         the pelt board defining a top end for accommodating and fixating the nose end of the pelt, a circumferential and apertured wall defining an inner cavity and an outer surface for facing the inwardly oriented leather side of the pelt and a bottom end opposite the top end, the pelt board defining an outer bottom end contour at the bottom end, the outer bottom end contour defining a bottom end area, the pelt board further having a connector extending outwardly from the bottom end and adapted for connecting the pelt board to the drying unit,   the drying unit having a housing defining a top surface and including a blower or communicating with a blower assembly for supplying air into the housing, the top surface defining a receptor aperture having a configuration matching the connector of the pelt board and serving to receive the connector for supporting the pelt board in an upright position relative to the top surface,   an air inlet being provided into the inner cavity at the bottom end of the pelt board for allowing air to be introduced into the inner cavity and to be forced out through the apertured wall for the drying of the inwardly oriented leather side of the pelt, the air inlet defining an inlet area constituting at least 15% of the bottom area of the pelt board and less than approximately 95% of the bottom area, and preferably more than 30% of the bottom area, such as further preferably approximately 45-50% of the bottom area of the pelt board, and   an air outlet being provided at the top surface of the housing for communicating with the air inlet and defining an outlet area constituting between 15% and 95% of the bottom area, such as preferably more than 30%, such as preferably 45-50% of the bottom area of the pelt board.       

     According to the investigations and experiments carried out by the applicant, which will be discussed below, it has been revealed that the pelt boards which have been developed by the applicant company and also the competitor company Jasopels NS and known as ‘FIX-tane 2’ and ‘XL-tane’, respectively, have inherently a limitation as to the volume of air, which may be forced through the pelt boards, which limitation is primarily determined by the air inlet into the pelt board in question, which air inlet is established through the connector of the pelt board, which connector is in the prior art described as a “stubby element”. Apart from the inlet limitation, the overall configuration and in particular the apertured outer surface of the pelt board also establishes a limitation as to the air inlet capability or volumetric air inlet capability of the prior art pelt boards. In accordance with the teachings of the present invention as defined in the ninth aspect of the present invention, the air outlet from the drying unit and the air inlet into the pelt board, which drying unit and pelt board constitute a system according to the ninth aspect of the present invention exhibit a large interface area allowing a substantive increase of the air inlet into the pelt board, which again improves the drying capability or reduces the drying time for the drying of the pelts mounted on the pelt boards. It is in this context to be realized that an extended drying time may in itself deteriorate the pelt for the reason that the existence of wet areas at the leather side of the pelt may generate so-called black spots, which eventually deteriorate the pelts and reduces the commercial value of the pelt. 
     In accordance with the presently preferred embodiment of the system according to the ninth aspect of the present invention, the air inlet area and the air outlet area are of the same size or alternatively of substantially the same size, simply for gaining the benefit of the large inlet area of the pelt board. As will be evident from the below detailed description of experiments carried out by the applicant company, it will be verified that an increase of the inlet area above approximately 45-50% of the bottom area provides a rather limited increase in the drying capability of the pelt board and the overall system, as it is contemplated that the dominating factor in determining the maximum drying capability and the maximum volume of air, which may be forced into the drying pelt, is in an embodiment in which the inlet air exceeds 50% of the bottom area predominantly determined or limited by the apertured wall of the pelt board. 
     The air inlet of the pelt board may be constituted by a single large aperture at the bottom of the pelt board or alternatively be implemented by several individual air inlets, which are preferably located circumferentially encircling the connector of the pelt board simply for increasing the flow of air into the pelt board along the central axis of the pelt board. Similarly, the air outlet of the drying unit may advantageously in accordance with and in conformity with the above embodiment of the pelt board be located circumferentially encircling the receptor aperture. 
     In accordance with the prior art technique as implemented in the commercially available products produced and sold by the applicant company and also the competitor company Jasopels NS, the connector may have additional inlet slots for allowing air to be introduced into the inner cavity from the housing of the drying unit through the slots which additional slots evidently further increases the volumetric input of air into the pelt board. 
     In accordance with specific further embodiments of the system according to the ninth aspect of the present invention, two adaptors are provided, the one serving for allowing a conventional drying unit to be used in combination with the drying unit of the system according to the ninth aspect of the present invention, and the alternative or second embodiment constituting an adaptor allowing the pelt board of the system according to the ninth aspect of the present invention to be used in combination with the conventional drying unit to be used in combination with the conventional or prior art pelt board such as the above described pelt boards produced by the applicant company and the competitor company Jasopels NS. According to these two distinct embodiments of the system according to the ninth aspect of the present invention, the system further comprises a first adaptor having an inlet end configured in conformity with the bottom end of the pelt board and having an opposite closed-off upper end, in which a minor air outlet aperture, such as an aperture of the size of 400 mm 2 , is provided for allowing air to be output through the minor air outlet aperture for input into a conventional pelt board having a smaller size connector through which air is input into the inner cavity of the pelt board through the connector, the first adaptor having a first inner air passage from the air inlet to the minor air outlet aperture, and still further comprises a second adaptor having an outlet configured in conformity with the bottom end of the pelt board and having an opposite closed-off bottom end, from which a smaller size connector extends, the smaller size connector having inlet slots for allowing air to be introduced into the inner space of the second adaptor through the smaller size connector, the second adaptor having a second inner air passage from the small size connector to the air outlet. 
     In accordance with the system according to the ninth aspect of the present invention, the drying unit is advantageously embodied for receiving a plurality of pelt boards and the system consequently further, according to the presently preferred embodiment of the system according to the ninth aspect of the present invention comprises a set of pelt boards and a housing of the drying unit, similarly has a plurality of receptor apertures and air outlets. 
     In order to improve the drying capability of the system according to the ninth aspect of the present invention, the drying unit preferably has biased closing-off plates for closing off receptor apertures and corresponding air outlets, in which receptor apertures no pelt board is received, simply to prevent that the air forced into the housing of the drying unit is outlet through open receptor apertures and corresponding air outlets without being introduced into the pelt boards, on which pelts are mounted and consequently being wasted in relation to the intentional purpose of forcing air into the housing of the drying unit, namely of causing the air to be outlet from the housing of the drying unit and input into the pelt boards, on which pelts are received. 
     It is to be realized that the system according to the ninth aspect of the present invention and particularly the pelt board of the system according to the ninth aspect of the present invention may be implemented in accordance with the above described aspects of the present invention relating to the advantageous embodiments of the expandable and collapsible pelt boards. 
     The above objects, the above features and the above advantages together with the above described specific objects of improving the drying capability of the pelt boards and the associated drying units together with numerous other objects, advantages and features will be evident from the below detailed description of the present invention, are according to a tenth aspect of the present invention obtained by a drying unit for use in combination with a pelt board and for drying a pelt, the pelt having a substantially tubular shape defining an inwardly oriented leather side and an outwardly oriented fur side and further defining a nose end and a rear end,
         the drying unit having a housing defining a top surface and including a blower or communicating with a blower assembly for supplying air into the housing, the top surface defining a receptor aperture having a configuration matching a connector of the pelt board and serving to receive the connector for supporting the pelt board in an upright position relative to the top surface, and   an air outlet being provided at the top surface of the housing defining an outlet area constituting between 15% and 95% of the bottom area, such as preferably more than 30%, such as preferably 45-50% of the bottom area of the pelt board.       

     The drying unit according to the tenth aspect of the present invention may advantageously include any of the features of the above described system according to the ninth aspect of the present invention. 
     The above objects, the above features and the above advantages together with the above described specific objects of improving the drying capability of the pelt boards and the associated drying units together with numerous other objects, advantages and features will be evident from the below detailed description of the present invention, are according to an eleventh aspect of the present invention obtained by a pelt board for use in combination with a drying unit for drying a pelt, the pelt having a substantially tubular shape defining an inwardly oriented leather side and an outwardly oriented fur side and further defining a nose end and a rear end,
         the pelt board defining a top end for accommodating and fixating the nose end of the pelt, a circumferential and apertured wall defining an inner cavity and an outer surface for facing the inwardly oriented leather side of the pelt and a bottom end opposite the top end, the pelt board defining an outer bottom end contour at the bottom end, the outer bottom end contour defining a bottom end area, the pelt board further having a connector extending outwardly from the bottom end and adapted for connecting the pelt board to the drying unit, and   an air inlet being provided into the inner cavity at the bottom end of the pelt board for allowing air to be introduced into the inner cavity and to be forced out through the apertured wall for the drying of the inwardly oriented leather side of the pelt, the air inlet defining an inlet area constituting at least 15% of the bottom area of the pelt board and less than approximately 95% of the bottom area, and preferably more than 30% of the bottom area, such as further preferably approximately 45-50% of the bottom area of the pelt board.       

     The pelt board according to the eleventh aspect of the present invention may, apart from any of the features of the pelt board defined in the system according to the ninth aspect of the present invention, preferably and advantageously include features according to the above described aspects relating to the expandable and collapsible pelt boards according to the previously described aspects of the present invention. 
     The above objects, the above features and the above advantages together with the above described specific objects of improving the drying capability of the pelt boards and the associated drying units together with numerous other objects, advantages and features will be evident from the below detailed description of the present invention, are according to an twelfth aspect of the present invention obtained by an adaptor for use in combination with a drying unit for drying a pelt, and a pelt board, the pelt having a substantially tubular shape defining an inwardly oriented leather side and an outwardly oriented fur side and further defining a nose end and a rear end, the pelt board and the drying unit defining an air transfer area between the bottom end of the pelt board and an air outlet of the drying unit constituting between 15% and 95% of the bottom end area of the pelt board, such as preferably more than 30%, such as preferably 45-50% of the bottom area of the pelt board, the adaptor having an inlet end configured in conformity with the bottom end of the pelt board and having an opposite closed-off upper end, in which a minor air outlet aperture, such as an aperture of the size of 400 mm 2 , is provided for allowing air to be output through the minor air outlet aperture for input into a conventional pelt board having a smaller size connector through which air is input into the inner cavity of the pelt board through the connector, the first adaptor having an inner air passage from the air inlet to the minor air outlet aperture. 
     The above objects, the above features and the above advantages together with the above described specific objects of improving the drying capability of the pelt boards and the associated drying units together with numerous other objects, advantages and features will be evident from the below detailed description of the present invention, are according to an thirteenth aspect of the present invention obtained by an adaptor for use in combination with a drying unit for drying a pelt, and a pelt board, the pelt having a substantially tubular shape defining an inwardly oriented leather side and an outwardly oriented fur side and further defining a nose end and a rear end, the pelt board having a smaller size connector at its bottom end, through which smaller size connector air is input into the inner cavity of the pelt board, and the drying unit having a minor receptor and air outlet aperture for receiving the smaller size connector, such as an aperture of the size of 400 mm 2 , the adaptor having an inlet end including the smaller size connector and having an opposite upper end, in which an air outlet aperture of the size of 1000 mm 2 -2500 mm 2  is provided for allowing air to be output through the air outlet aperture for input into a pelt board having an air inlet of the size of 1000 mm 2 -2500 mm 2  into an inner cavity of the pelt board, the adaptor having an inner air passage from the smaller size connector to the air outlet aperture. 
     The above objects, the above features and the above advantages together with the above described specific objects of improving the drying capability of the pelt boards and the associated drying units together with numerous other objects, advantages and features will be evident from the below detailed description of the present invention, are according to a fourteenth aspect of the present invention obtained by a system for drying a pelt, the system comprising a drying unit and a pelt board, the pelt having a substantially tubular shape defining an inwardly oriented leather side and an outwardly oriented fur side and further defining a nose end and a rear end,
         the pelt board defining a top end for accommodating and fixating the nose end of the pelt, a circumferential and apertured wall defining an inner cavity and an outer surface for facing the inwardly oriented leather side of the pelt and a bottom end opposite the top end, the pelt board defining an outer bottom end contour at the bottom end, the outer bottom end contour defining a bottom end area,   the drying unit having a housing defining a top surface and including a blower or communicating with a blower assembly for supplying air into the housing,   an air inlet being provided into the inner cavity at the bottom end of the pelt board for allowing air to be introduced into the inner cavity and to be forced out through the apertured wall for the drying of the inwardly oriented leather side of the pelt, and   an air outlet being provided at the top surface of the housing for communicating with the air inlet via an interface there between, the interface establishing connection between the pelt board and the drying unit for supporting the pelt board in an upright position relative to the top surface defining an interface area constituting at least 15% of the bottom area of the pelt board less than approximately 95% of the bottom area, and preferably more than 30% of the bottom area, such as further preferably approximately 45-50% of the bottom area of the pelt board.       

     The above objects, the above features and the above advantages together with the above described specific objects of improving the drying capability of the pelt boards and the associated drying units together with numerous other objects, advantages and features will be evident from the below detailed description of the present invention, are according to a fifteenth aspect of the present invention obtained by a drying unit for use in combination with a pelt board and for drying a pelt, the pelt having a substantially tubular shape defining an inwardly oriented leather side and an outwardly oriented fur side and further defining a nose end and a rear end,
         the drying unit having a housing defining a top surface and including a blower or communicating with a blower assembly for supplying air into the housing, the top surface defining an interface relative to the pelt board for supporting the pelt board in an upright position relative to the top surface and for allowing air to be input to an inner cavity of the pelt board from the drying unit,   the interface defining an interface area between the pelt board and the top surface constituting between 15% and 95% of the bottom area of the pelt board, such as preferably more than 30%, such as preferably 45-50% of the bottom area of the pelt board.       

     It is to be realized that the system according to the fourteenth aspect of the present invention and particularly the pelt board of the system according to the fourteenth aspect of the present invention and further the drying unit according to the fifteenth aspect of the present invention may be implemented in accordance with the above described aspects of the present invention relating to the advantageous embodiments of the expandable and collapsible pelt boards. 
     Within the technical field of processing pelts by the use of pelt boards, it is common to use a kind of fastener for fixating the rear end of the pelt relative to the bottom end of the pelt board. The fasteners conventionally used comprise a tight fitting plastic bag, which is slided down from the nose end of the pelt to the rear end of the pelt causing a tight fit round the pelt for allowing the processing of the pelt in a tanning machine, in which the pelt is stretched and further in a drying unit, in which the pelt is dried. An alternative technique involves the use of a wrapping polymer band which is wrapped round the rear end of the pelt for fixating the rear end of the pelt relative to the pelt board. These techniques have been commercially exploited by several companies, including the applicant company and the competitor company Jasopels NS for substituting the old fashioned prior art technique of using metal nails or metal clamps for fixating the pelt relative to the pelt board, which in this context would be a wooden pelt board rather than a polymer pelt board. 
     The technique of fastening the pelt relative to the pelt board is still open for improvements and the applicant company has conducted tests for providing improvements of the pelt board system by improving the technique of fastening the pelt relative to the pelt board without deteriorating the pelt, in particular tearing the hair off the pelt or destroying the skin of the pelt. 
     It is consequently a further object of the present invention to provide an improved technique of fixating and maintaining the pelt in a fixed position relative to the pelt board in a pelt board system comprising a pelt board for receiving a pelt thereon and a fastening assembly for fastening the pelt relative to the pelt board, which object together with the above objects, the above features and the above advantages together with numerous other objects, advantages and features, which will be evident from the below detailed description of the present invention, are according to a sixteenth aspect of the present invention obtained by a pelt board system comprising a pelt board for receiving a pelt thereon and a fastening assembly for fastening the pelt relative to the pelt board, the pelt having a substantially tubular shape defining an inwardly oriented leather side and an outwardly oriented fur side and further defining a nose end and a rear end,
         the pelt board defining a top end for accommodating and fixating the nose end of the pelt, a circumferential and apertured wall defining an inner cavity and an outer surface for facing the inwardly oriented leather side of the pelt, and a bottom end opposite the top end, the pelt board defining a profiled outer bottom end at the bottom end, and   the fastening assembly comprising a pair of opposing rigid fastening sections, a pair of opposing flexible sections, each connected to a fastening section, a rigid section interconnecting the flexible sections and a plurality of gripping members protruding from the rigid section, the rigid fastening section and the flexible section, the fastening assembly being shiftable between an open position and a closed position, the fastening assembly being positionable circumferentially encircling the rear end of the pelt at the profiled outer bottom end of the pelt board, when in the open position, and the fastening assembly being tightly engaging with the pelt at the rear end and engaging with the profiled outer bottom end of the pelt board by the opposing rigid fastening sections.       

     In accordance with the novel pelt board system according to the sixteenth aspect of the present invention, a dedicated fastening assembly comprising rigid fastening sections and flexible sections is provided, which allows for the fixation of the pelt relative to the pelt board by the fastening assembly engaging tightly with the pelt at the rear end of the pelt and sandwiching the pelt between the rigid fastening sections and the outer surface of the pelt board. In this context, the pelt board further has at its lower end or bottom end a profiled outer bottom end improving the ability of the rigid fastening sections of the fastening assembly to engage and arrest the pelt relative to the pelt board. 
     In accordance with further alternative techniques according to the sixteenth aspect of the present invention, the above described tight fitting plastic bag or fixation bag and the above described wrapping strap are used and included in the pelt board system as the system may, in accordance with a first modified embodiment, comprise a fixation bag to be tightly positioned around the rear end of the pelt and interlayered between the rigid fastening sections of the fastening assembly and the rear end of the pelt board or alternatively, according to a second or modified alternative embodiment, comprise a wrapping polymer strap to be wrapped around the rear end of the pelt at the profiled outer bottom end of the pelt board and to be sandwiched between the rear end of the pelt and the rigid fastening sections of the fastening assembly. 
     In a further preferred embodiment of the pelt board system according to the sixteenth aspect of the present invention, the profiled outer bottom end of the pelt board is provided with protruding circumferential ridges defining a specific spacing between the circumferential ridges and the fastening sections of the fastening assembly are provided with corresponding dedicated contacting elements, which are spaced in conformity with the spacing of the ridges of the pelt board in order to provide a firm arresting and fixation of the fastening assembly relative to the ridges of the pelt board. 
     In accordance with a further embodiment of the above described presently preferred embodiment of the pelt board system according to the sixteenth aspect of the present invention including ridges provided at the profiled outer bottom end of the pelt board, the fastening elements of the fastening system constitute rows or pads for engaging the skin side of the pelts without to any substantial extent squeezing the hairs of the pelt between the fastening pads and the skin side of the pelts. 
     A further or seventeenth aspect of the present invention relates to a fastening assembly for use in combination with a pelt board for receiving a pelt thereon and for fastening the pelt relative to the pelt board, the pelt having a substantially tubular shape defining an inwardly oriented leather side and an outwardly oriented fur side and further defining a nose end and a rear end,
         the pelt board defining a top end for accommodating and fixating the nose end of the pelt, a circumferential and apertured wall defining an inner cavity and an outer surface for facing the inwardly oriented leather side of the pelt, and a bottom end opposite the top end, the pelt board defining a profiled outer bottom end at the bottom end, and   the fastening assembly comprising a pair of opposing rigid fastening sections, a pair of opposing flexible sections, each connected to a fastening section, a rigid section interconnecting the flexible sections and a plurality of gripping members protruding from the rigid section, the rigid fastening section and the flexible section, the fastening assembly being shiftable between an open position and a closed position, the fastening assembly being positionable circumferentially encircling the rear end of the pelt at the profiled outer bottom end of the pelt board, when in the open position, and the fastening assembly being tightly engaging with the pelt at the rear end and engaging with the profiled outer bottom end of the pelt board by the opposing rigid fastening sections, fulfilling the above objects, features and advantages characteristic of the present invention.       

     It is to be realized that the pelt board system according to the sixteenth aspect of the present invention and further the fastening assembly according to the seventeenth aspect of the present invention may advantageously be implemented in accordance with the above described aspect of the present invention relating to the advantages and embodiments of the expandable and collapsible pelt boards. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1A  illustrates a contracted pelt board according to the present invention. 
         FIG. 1B  illustrates an expanded pelt board according to the present invention. 
         FIG. 2A  illustrates a cut out view of a contracted pelt board. 
         FIG. 2B  illustrates a cut out view of an expanded pelt board. 
         FIG. 3  illustrates a further pelt board embodiment according to the present invention. 
         FIG. 4  illustrates the upper part of a pelt board according to the present invention. 
         FIG. 5  illustrates the lower part of a pelt board according to the present invention. 
         FIG. 6A  illustrates the assembly of a pelt board according to the present invention. 
         FIG. 6B  illustrates an elongated core element and wall elements of the pelt board. 
         FIG. 7A  illustrates the working principle of the peripheral part. 
         FIG. 7B  illustrates the expansion of the peripheral part. 
         FIG. 8A  illustrates an actuator member interacting with the opposite core surface. 
         FIG. 8B  illustrates the elongated core element and wall elements of the pelt board. 
         FIG. 9A  illustrates actuator members and cooperating members of the pelt board. 
         FIG. 9B  illustrates the movement of the actuator members and cooperating members. 
         FIG. 9C  illustrates the fastening member and the track of the pelt board. 
         FIG. 9D  illustrates the movement of the fastening member in relation to the track. 
         FIG. 10A  illustrates the assembly of the upper part of the pelt board. 
         FIG. 10B  illustrates the finished upper part of the pelt board. 
         FIG. 11A  illustrates the upper part of the pelt board in the contracted state. 
         FIG. 11B  illustrates the upper part of the pelt board in the expanded state. 
         FIG. 12A  illustrates the use of intermediate sections. 
         FIG. 12B  illustrates the working principle of the intermediate sections. 
         FIG. 13  illustrates a further embodiment of the pelt board. 
         FIG. 14  illustrates the assembly of the bottom part of the pelt board. 
         FIG. 15  illustrates the connecting element of the pelt board. 
         FIG. 16  illustrates the protrusions of the locking mechanism of the core element. 
         FIGS. 17A, 17B, 17C and 17D  are a series illustrating the working principle of the locking mechanism. 
         FIG. 18A  illustrates a further embodiment of the pelt board in the contracted state. 
         FIG. 18B  illustrates a further embodiment of the pelt board in the expanded state. 
         FIG. 19  illustrates a pelt board and a drying unit. 
         FIGS. 20A, 20B and 20C  are a series illustrating the working principal of a further embodiment of the pelt board according to the present invention. 
         FIGS. 21A and 21B  illustrate the expansion of the pelt board in a first transversal direction. 
         FIGS. 22A and 22B  illustrate the expansion of the pelt board in a second transversal direction. 
         FIGS. 23A, 23B and 23  C are a series illustrating the expansion of the pelt board in two different transversal directions. 
         FIG. 24  illustrates details of a further and presently preferred embodiment of the pelt board according to the present invention. 
         FIG. 25  illustrates the pelt board also shown in  FIG. 24  in a disassembled state. 
         FIG. 26  illustrates details of the pelt board also shown in  FIGS. 24 and 25 . 
         FIG. 27  illustrates further details of the pelt board, also shown in  FIGS. 24-26 . 
         FIGS. 28A, 28B and 28C  are a series illustrating schematically a first embodiment of a pelt board according to the present invention. 
         FIGS. 29A, 29B and 29C  are a series similar to the series of  FIGS. 28A, 28B and 28C , respectively, illustrating an alternative embodiment of the pelt board according to the present invention. 
         FIGS. 30A, 30B and 30C  are a series similar to the series of  FIGS. 29A, 29B and 29C , respectively, illustrating a modification of the embodiment shown in  FIGS. 29A, 29B and 29C . 
         FIGS. 31A and 31B  are illustrations similar to the illustrations of  FIGS. 28A and 28B , respectively, of a complete pelt board. 
         FIG. 32  illustrates details of the pelt board shown in  FIGS. 28A-28C . 
         FIG. 33  illustrates further details of the assembling of the pelt board shown in  FIG. 32 . 
         FIG. 34  illustrates a pelt board, a pelt and a clip. 
         FIG. 35A  illustrates a clip. 
         FIG. 35B  illustrates gripping members of the clip. 
         FIG. 35C  illustrates gripping members and hair of a pelt. 
         FIG. 35D  illustrates a rounded gripping member. 
         FIG. 36  illustrates, similar to  FIG. 34 , a pelt with a fixating plastic bag, a pelt board and a clip. 
     
    
    
     DETAILED DESCRIPTION OF THE DRAWINGS 
     In the below detailed description of the various embodiments described with reference to the drawings, the same reference numerals are used throughout the figures identifying identical components described only once in the first occurrence of the element. Elements or components serving the same purpose or being configured similar to previously described components or elements, respectively, are designated the same reference numeral as previously indicated, however, added a marking to identify the geometrical difference from the previously described component or element, still, to the use of the same integer identifying the correspondence as to function and structure. It is further contemplated that elements or components from one embodiment described below may readily be combined with another embodiment with reference to a different figure, as the various variants of embodiments are readily interchangeable and/or elements or components from one embodiment being readily substituted with or by components or elements of another embodiment. 
       FIG. 1A  shows a perspective view of a first embodiment of a pelt board  10  in the contracted state. The pelt board  10  comprises a lower part  12  and an upper part  14 . The lower part  12  comprises a first arched wall element  16 , a second wall element  18 , a third wall element  20 , a fourth wall element  22  which together define a cavity  24  in which an elongated core element  26  is located. The first arched wall element  16 , the second wall element  18 , the third wall element  20  and the fourth wall element  22  are shown here schematically as being solid, it is however understood that for optimal drying of the pelt, they should be louvered for allowing ventilation air to pass from the pelt board to the pelt. The upper part  14  comprise a fifth wall element  28  and a sixth wall element  30 , both which in the present case are arched and tapered but which also may be made non-arched and non-tapered. The elongated core element  26  extends into the upper part  14  in the form of a core extension element  26 ′. 
     The first wall element  16  and the second wall element  18  comprises respective peripheral elements  16 ′  16 ″  18 ′  18 ″, which are flexibly connected to the center elements of the respective first wall element  16  and the second wall element  18 . The third wall element  20  will in the present contracted state overlap the peripheral elements  16 ′  18 ′ and the fourth wall element  20  will in the present contracted state overlap the peripheral elements  16 ″  18 ″. The fifth wall element  28  and a sixth wall element  30  both mutually overlap each other. An extension element  32  is interconnecting the lower part  12  and the upper part  14 . 
       FIG. 1B  shows a perspective view of the first embodiment of the pelt board  10  in the expanded state. By pushing the elongated core element  26  in a longitudinal direction as shown by the arrows, the wall elements are all forced in outwardly oriented directions as shown by the arrows. The first wall element  16  and the fifth wall element  28  are moved along a first radial dimension while the second wall element  18  and the sixth wall element  30  are moved along the first radial dimension but in the opposite direction, the first radial dimension being perpendicular to the longitudinal direction defined by the elongated core element  26 . The third wall element  20  and the fourth wall element  22  are forced in opposite directions along a second radial direction as shown by the arrows, which second radial direction is perpendicular to both the first radial dimension and to the longitudinal dimension. The peripheral portions  16 ′  16 ″  18 ′  18 ″ of the respective first wall element  16  and second wall element  18  move along both the first and second radial dimensions such that the expanded pelt board  10 ′ form a smooth outer surface. 
       FIG. 2A  shows a cut-out perspective view of another embodiment of a pelt board  10 ′ in the contracted state. The third wall element  20  and the fourth wall element  22  comprise actuator members  34  along the longitudinal dimension and the elongated core element  26  comprise cooperating members  36  along the longitudinal dimension. The actuator members  34  and cooperating members  36  define opposing wedges. In the contracted state of the pelt board  10 , the sloping surfaces of the opposing wedges are non-overlapping or overlapping such that no outwardly oriented force is generated, i.e. that the protruding portions of the opposing wedges are non-overlapping. 
     The fifth wall element  28  and the sixth wall element  30  comprise actuator members  34 ′ along the longitudinal dimension and the elongated core element  26  comprise cooperating members  36 ′ along the longitudinal dimension. The actuator members  34 ′ define curved grooves along the longitudinal dimension of the fifth wall element  28  and the sixth wall element  30  whereas the cooperating members  36  define pins of the core extension element  26 ′. 
       FIG. 2B  shows a cut-out perspective view of the pelt board  10 ′ in the expanded state. The sloping surfaces of the opposing wedges are now overlapping such that an outwardly oriented force is achieved, i.e. the protruding parts of the opposing wedges are overlapping causing the third wall element  20  and the fourth wall element  22  to move outwardly in opposite directions. 
     When the core extension element  26 ′ moves together with the elongated core element  26  along the longitudinal dimension, the pins constituting the cooperating members  36 ′ move along the curved grooves constituting the actuator members  34 ′ and thereby causing the fifth wall element  28  and the sixth wall element to move outwardly in opposite directions. 
     The movement of the first wall element  16  and the second wall element  18  will be explained in detail in the following figures. 
       FIG. 3  shows a perspective view of a further embodiment of a pelt board  10 ″. In the present embodiment, the fifth wall element  28  and the sixth wall element  30  are substantially flat in order to be able to accommodate the neck part of the animal pelt. The surface of the arched wall elements  16   18   20   22  have ribs  38  for allowing the pelt to be properly fixated to the pelt board  10 ″. Further all of the wall elements  16   18   20   22  have ventilation holes  40 . 
       FIG. 4  shows a perspective view of the upper part  14  of the pelt board  10 ″. It shows in detail how the fifth wall element  28  and the sixth wall element  30  both connect to the core extension element  26 ′. The actuator elements  34 ′ in form of curved grooves connect to the cooperating members  36 ′ in the form of pins. By longitudinal movement of the core extension element  26 ′, the pins will follow the path defined by the curved grooves and thus cause the fifth wall element  28  and the sixth wall element  30  to move outwardly along the curve defined by the interaction between the curved grooves and the pins. 
       FIG. 5  shows a perspective view of the lower part  12  of the pelt board  10 ″. In the present embodiment the first wall element  16  is composed of two elements designated the reference numerals  16 A and  16 B which are interconnected by means of a snap fit connection  42 . Also, the second wall element  18  is composed of two elements designated the reference numerals  18 A and  18 B and which are interconnected by means of a snap fit connection  42 . 
       FIG. 6A  shows a perspective view of the lower part  12  of the pelt board  10 ″. The present view especially shows a close-up view of the elements  16 A  16 B  18 A  18 B making up the first wall element  16  and the second wall element  18 , respectively. In order to make the first wall element  16  and the second wall element  18  move in the first radial direction, the snap fit mechanisms  42   42 ′, when assembled, define actuator members  34 ″ in the form of pins. The elongated core element  26  defines cooperating members  36 ″ in the form of curved grooves. The working principle of the curved groove and the pin is the same as for the upper part of the pelt board  10 ″. The pins are guided by the curved grooves and forced inwardly/outwardly according to the longitudinal movement of the elongated core element  26 . Thereby, the first wall element  16  and the second wall element  18  move along the first radial dimension and at the same time the first wall element  16  and the second wall element  18  are held by the elongated core element  26 . 
     The wall elements  16 A  16 B  18 A  18 B also each comprise a number of respective peripheral parts  44  which are flexibly connected to its corresponding wall elements  16 A  16 B  18 A  18 B. 
       FIG. 6B  shows a perspective view of the lower part  12  of the pelt board  10 ″ when assembled. When interconnected, each of the snap fit mechanism  42   42 ′ will form a pin  34 ″ to be guided in the curved groove of the elongated core element  26 . The peripheral parts  44 , which will be described in detail below, form a substantially smooth and continuous surface together with it corresponding wall element  16   18 . 
       FIG. 7A  shows a close up view describing the functional principle of the elongated core element  26 , the wall element  16 A and the corresponding peripheral part  44 . The present view represents the contracted state of the pelt board. The elongated core element  26  comprises a further cooperating member  36 ′″ constituting a wedge and which is adapted to cooperate with an actuator member  34 ′″ constituting a protrusion on the peripheral part  44 . 
       FIG. 7B  shows the setup of  FIG. 7B  when in the expanded state. The elongated core element  26  moves in the longitudinal direction relative to the wall element  16   a  and causes the wall element  16 A to move outwardly in the first radial direction as shown by the arrows. The outwardly movement of the wall element  16 A is caused by the interaction between the cooperating member  36 ′″ and the actuator member  34 ′″. The longitudinal movement of the elongated core  26  causes the actuator member  34 ′″ constituting a protrusion to slide on the cooperating member  36 ′″ constituting a wedge and thereby the peripheral part  44  is caused to move outwardly in both the first and second radial directions as shown by the arrow. 
       FIG. 8A  shows a perspective view illustrating how the third wall element  20  and the fourth wall element  22  are fastened together and to the elongated core element  26 . The third and fourth wall elements  20   22  each comprise further actuator members in the form of fastening members  46 , which are cooperating with corresponding tracks  48  of the elongated core element  26 . The third and fourth wall elements  20   22  are in the present embodiment additionally joined together via corresponding clip-on mechanisms  50   50 ′ at the bottom end of the pelt board. 
       FIG. 8B  shows the lower part  12  of the pelt board when the third wall element  20  and the fourth wall element  22  are fastened together and to the elongated core element  26 . 
       FIG. 9A  shows a close-up view illustrating the working principle of the third wall element  20  and the fourth wall element  22 . The third wall element  20  and the fourth wall element  22  each comprise actuator members  34  and the elongated core element  26  comprises cooperating members  36 . The actuator members  34  and the cooperating members  36  define wedges having sloped in opposite direction. In the present contracted state, the wedges of the actuator members  34  and the cooperating members  36  are located such that the protruding parts of the wedges are non-overlapping, allowing the third wall element  20  and the fourth wall element  22  to define a small distance between themselves. The fastening members  46 , described in detail in the previous figure, will in the present case be interacting with the corresponding tracks  48  of the elongated core element  26  such that each of the third wall element  20  and the fourth wall element  22  are pulled inwardly towards the elongated core element  26 . 
       FIG. 9B  shows a close-up view illustrating the working principle of the third wall element  20  and the fourth wall element  22  when in the expanded state. In the present expanded state, the wedges of the actuator members  34  and the cooperating members  36  are located such that the protruding parts of the wedges are overlapping, causing the third wall element  20  and the fourth wall element  22  to define a larger distance between themselves. The moving principle of the third wall element  20 , the fourth wall element  22  and the elongated core element  26  is illustrated by the arrows. 
       FIG. 9C  shows a close-up view illustrating the working principle of the fastening member  46  when the pelt board is in the expanded state. The fastening member  46  has a wedged shape for controlling the distance between the elongated core element  26  and the respective third wall element  20  and the fourth wall element  22  depending on the longitudinal position of the elongated core element  26 . The fastening member  46  of the respective third wall element  20  and the fourth wall element  22  grasps the track  48  of the elongated core element  26  which is located opposite the third wall element  20  of which the present fastening member  46  is part of. 
       FIG. 9D  shows a close-up view illustrating the working principle of the fastening member  46  when the pelt board is in the expanded state. The contraction of the wall third wall element  20  and the fourth wall element  22  may be controlled in that the slope of the fastening member causes the third wall element  20  and the fourth wall element  22  to move closer to the elongated core element  26  when the pelt board is assuming the contracted state. 
       FIG. 10A  shows the mounting principle of the upper part  14 . In the first step, the fifth wall element  28  and the sixth wall element  30  are positioned in a partial overlapping position about the core extension element  26 ′. In the next step, the cooperating members  36 ′, which constitute pins, are positioned through the actuator members  34 ′, which constitute curved grooves, and through the center of the core extension element  26 ′. 
       FIG. 10B  shows a perspective view of the upper part  14  when mounted and when in the expanded state. 
       FIG. 11A  shows the moving principle of the upper part  14  of the pelt board. The cooperating members  36 ′ are guided in the actuator members  34 ′ for causing the fifth wall element  28  and the sixth wall element  30  to minimize the radial dimension between themselves and relative to the core extension element  26 . 
       FIG. 11B  shows the moving principle of the upper part  14  of the pelt board. The cooperating members  36 ′ are guided in the actuator members  34 ′ for causing the fifth wall element  28  and the sixth wall element  30  to increase the radial dimension between them and relative to the core extension element  26  when the core extension element  26  is moved in the longitudinal direction as shown by the arrows. 
       FIG. 12A  shows a perspective view of a further embodiment of a pelt board  10 ′″. The pelt board  10 ′″ resembles the pelt boards of the previous embodiments however in order to be able to adjust the length of the pelt board  10 ′″, there has been included intermediate sections  52  in-between the upper part  14  and the lower part  12 . The intermediate sections  52  constitute elliptic cylindrical spacer elements which are non-expandable. The intermediate sections  52  may be made non-expandable since the pelt is most likely to stick to the upper part  14  and the lower part  12 . However, the intermediate sections  52  may of course also be made expandable similar to the lower part  12  or the upper part  14 . For large pelts, a plurality of intermediate sections  52  may be used. A core connecting element  26 ″ may be used for interconnecting the elongate core element of the lower part  12  and the core extension element of the upper part  14 . 
       FIG. 12B  shows a perspective view of a third embodiment of a pelt board  10 ′″ and illustrates how the lower part  12  and the upper part  14  is expanding as shown by the arrows, while the intermediate sections remain constant in circumference. 
       FIG. 13  shows a perspective view of a fourth embodiment of a pelt board  10   IV . The present pelt board  56  comprises a number of ribs  56  which contribute to holding the pelt on the pelt board. Further, a number of ventilation holes  40  are present for allowing the pelt to dry quickly. The pelt board  10   IV  is of elliptical configuration and the third and fourth wall elements  20   22 , having an arched configuration, may overlap the first and second wall elements  16   18  in order to assume the expanded state and the contracted state. The elongated core element has in the present view been omitted. A large opening  58  is present at the bottom end of the pelt board  10   IV  for allowing a large amount of dry ventilation air to enter the pelt board  10   IV . 
       FIG. 14  shows the bottom end of the lower part  12  of the pelt board. The lower ends of the third wall element  20  and the fourth wall element  22  are fixated by means of cooperating clip-on mechanisms  50   50 ′ such that the third wall element  20  and the fourth wall element  22  cannot move in relation to each other adjacent the lower end of the pelt board. Typically, the pelt does stop a few centimeters above the lower end, otherwise a longer pelt board should be used. Thus, it is not necessary that the third wall element  20  and the fourth wall element  22  are movable adjacent the lower end of the pelt board. A connecting element  60  is used for moving the elongated core element  26  in the longitudinal direction. Also shown are first locking protrusions  62  located on each of the third wall element  20  and fourth wall element  22 . Second locking protrusions  64  are located on the connecting element  60 . The locking protrusions  62   64  are used to lock the elongated core element  26  in the expanded state. This will be explained further below. 
       FIG. 15  shows the lower part  12  of the pelt board when it has been assembled. The connecting element  60  extends from an opening  58 ′ at the lower end of the pelt board. The opening  58 ′ is preferably large for allowing a large flow of air to enter the interior of the pelt board  10  and most preferably the opening  58 ′ defines the greater part of the entire bottom surface of the pelt board  10 . The opening  58 ′ typically constitutes the limiting flow surface which determines the amount of air which will flow through the pelt board. A small opening  58 ′ would limit the flow which would cause a less efficient drying of the pelt. 
       FIG. 16  shows a perspective close up of the connecting element  60  and the locking principle employed to lock the pelt board in the expanded state. The third and fourth wall elements comprise first locking protrusions  62 , whereas the connecting element  60  comprises second locking protrusions  64 . The connecting element  60  is flexible in the first radial direction in relation to the third and fourth wall elements. The present locking mechanism is located adjacent the bottom end of the pelt board and together with the friction between the internal moving parts of the pelt board, i.e. the actuator members and the cooperating members, it will eliminate the need of any further locking mechanisms inside the pelt board. The present locking mechanism should be located adjacent the bottom end of the pelt board in order to avoid it being jammed by fatty substances which may come from the pelt. The change from expanded state to contracted state may preferably be made when the bottom end of the elongated core element is attached to the drying unit, e.g. by tilting the pelt board sideways, thereby also taking advantage of the leverage provided by the pelt board for overcoming the friction between the first and second protrusions. 
       FIG. 17A  shows the locked position of the pelt board. The first locking protrusions  62  are located below the second locking protrusions  64 . The first locking protrusion  62  thus prevents the longitudinal movement of the connecting element  60  and thus of the elongated core element. 
       FIG. 17B  shows the unlocking of the pelt board. By moving the connecting element  60  in the first radial direction, the second locking protrusion  64  is free to move past the first locking protrusion  62 . 
       FIG. 17C  shows the movement from expanded state to contracted state of the unlocked pelt board. By moving the connecting element  60  in the longitudinal direction, such that the second locking protrusion  64  moves past the first locking protrusion  62 , the state may be altered from the expanded state to the contracted state. 
       FIG. 17D  shows the connecting element  60  when the pelt board is in the contracted state. By releasing the connecting element  60 , it flexes back to its central relaxed position. 
       FIG. 18A  shows a perspective view of a further embodiment of a pelt board  10   V  when in the contracted state. The pelt board  10   V  comprises movable wall elements  16 ,  16 ′,  16 ″,  18 ,  18 ′,  18 ″,  20 ,  22  which together do not cover the complete circumference of the pelt board. In-between the wall elements  16 ,  16 ′,  16 ″,  18 ,  18 ′,  18 ″,  20 ,  22  fixed wall elements  54  are located. When in the contracted state, the wall elements  16 ,  16 ′,  16 ″,  18 ,  18 ′,  18 ″,  20 ,  22  form an even outer surface together with the fixed wall elements  54 . 
       FIG. 18B  shows a perspective view of a further embodiment of a pelt board  10   V  when in the expanded state. When in the expanded state, the wall elements  16 ,  16 ′,  16 ″,  18 ,  18 ′,  18 ″,  20 ,  22  move outwardly and form contact surfaces for the pelts. The moving principle of the wall elements  16 ,  16 ′,  16 ″,  18 ,  18 ′,  18 ″,  20 ,  22  have not been shown, however, preferably the same principles are used as for the previous embodiments. 
       FIG. 19  shows the pelt board during drying when connected to a drying unit  66 . The drying unit  66  has a ventilator  68  and a number of ventilation apertures  70 . The ventilator produces a flow of air which is led via the ventilation apertures  70  into the pelt board  10  through the openings  58 ′ at the lower part  12  of the pelt board  10 . 
       FIG. 20A  shows a perspective view of a further embodiment of the pelt board  10   VI , in which the first wall element  16  is integrally joint to the third wall element  20  as indicated by a line of junction  17  and similarly, the second wall element  18  is integrally joint to the fourth wall element  22  through a line of junction  19 . The embodiment of the pelt board  10   VI  shown in  FIGS. 20A-20C  presents the further feature of allowing the pelt board to be expanded in two alternative and separate directions; a first direction shown in  FIG. 20B  as indicated by arrows, according to which expansion the third wall element and the fourth wall element  22  are separated from one another for expanding the pelt board in a first transversal direction and likewise in  FIG. 20C , the expansion of the pelt board  10   VI  caused by shifting the first wall element  16  and the second wall element  18  relative to one another for expanding the pelt board in a direction indicated by arrows in  FIG. 20C , which direction is orthogonal to the direction of expansion shown in  FIG. 20B . 
       FIGS. 21A and 21B  illustrate in greater details the expansion of the pelt board  10   VI  in the first transversal direction indicated in  FIG. 20B  and similarly, in  FIGS. 22A and 22B , the expansion in the second transversal direction is illustrated in greater details. 
     As is indicated in  FIG. 20B  and  FIG. 20C  and likewise in  FIGS. 21A and 22A , the expansion in the second transversal direction is accomplished as a further movement of the elongated core element  26  as the movement of the central core element  26  from the position shown in  FIG. 20A  to the position shown in  FIG. 20B  accomplishes the expansion of the pelt board in the first transversal direction and further motion of the central core element  26  as indicated in  FIG. 20C  creates the further expansion in the second transversal direction. By modifying the actuator members  34 ,  36  and  46 ,  48  or repositioning them relative to one another, the shifting from the non-expanded state to the full expansion shown in  FIG. 20C  may be accomplished in a different way by firstly shifting the first and second wall element  16 ,  18  relative to one another and then afterwards shifting the third and fourth wall elements  18  and  20  relative to one another. In a still further variant of the pelt board  10   VI , the shifting of the pelt board from the non-expanded state to the first or the second expanded states shown in  FIGS. 20B and 20C , respectively, may be accomplished selectively by shifting the central core element  26  sidewise in order to contact the one set of actuators  34 ,  36  shown in  FIG. 21B , or alternatively the second set  46 ,  48  shown in  FIG. 22B . 
       FIGS. 24-27  illustrate a 3-component embodiment of the pelt board  10   IV , which embodiments constitutes the presently preferred embodiment of the pelt board according to the present invention. 
     In  FIG. 24 , the two shell parts  28  and  29  are shown exposing the exterior surfaces of the two shell parts and in addition, in the left hand part of  FIG. 24  exposing the upper ends of the two shell parts, which upper ends serve to catch and fixate a part of the pelt at the head of the pelt. As is evident from the enlarged views of  FIG. 24  at the left hand side of  FIG. 24 , the upper ends are provided with catching claws or teeth serving to fixate the head of the pelt relative to the pelt board. 
     In  FIG. 25 , the two shell parts  28  and  30  are shown in disassembled state exposing the central elongated core element  29  having at its lower end an outwardly protruding part serving to cooperate with a conventional tanning machine and a conventional drying machine. 
     In  FIGS. 26 and 27 , further details illustrated in enlarged views A-G of the pelt board is shown. In A and B, the outer surface of the top part of the pelt board is shown illustrating the longitudinal ridges of the pelt board and edgewise located apertures. In C, the upper end of the shell part  28  is shown illustrating the catching teeth, also shown in  FIG. 24 . In D, the cam surfaces of the elongated element  29  are shown in greater details and in E, the inner locking elements of the shell part  30  are shown. In F, the lower outwardly extending or protruding element constituting a so-called stubby element is shown, and in G, the locks of the shell part  30  are shown in greater details. 
     In general, the above described presently preferred embodiment  10   VI  of the pelt board according to the present invention fulfill the following features characteristic of the embodiment. The shell parts  28  and  30  are forcedly guided relative to the elongated core element  29  at a total of six locations along the shell parts, as the forcedly guiding or controlling is established during expansion of as well as during collapsing of the pelt board. The locks of the pelt board serve as a frictional lock preventing collapsing and expansion of the pelt board until an outer force generated by a pelt position on the pelt board activates the lock. The expansion in both transversal directions and likewise the collapsing in both transversal directions is forcedly controlled and guided. The above stubby elements together with the lower end of the shell parts serve to center the pelt board in a drying box or drying machine and provides a stop in the drying box. Further, the stubby element, as distinct from previously used stubby elements serving to catch and lock in the tanning machine and in the drying box or drying machine provides gripping flanges or elements for an improved fixation. For providing individual recordal of the pelt received on a specific pelt board, the pelt board is further provided with an internal holder for receiving an RFID (Radio Frequency Identification Device). 
     The shell parts further exhibit the following additional features by providing holes for the drying of the back part of the pelt and providing an increased air through flow as compared to conventional and commercially available pelt boards. In the longitudinal direction of the pelt board, the shell parts are reinforced every 60 mm and transversal bands are further provided every 30 mm. The overall surfaces of the two shell parts prevent vertical shifting of the pelt relative to the pelt board, and the teeth at the upper ends of the two shell parts fixate the upper end, i.e. the head of the pelt relative to the pelt board. The number of teeth for catching the head of the pelt may be constituted by any arbitrary numbers such as 2, 4, 6, 8 or even further teeth as the presently preferred embodiment exhibit a total of four teeth in each of the two shell parts  28  and  30 . The assembled pelt board  10   VI  shown in  FIGS. 24-27  further provide the advantage of collapsing the pelt board in its entire length and allows for machinery operated removal of the pelt from the pelt board. The overall cross section of the pelt board is similar to the geometry of an ellipse in the non-expanded or collapsed state, which provides an improved function as to easy mounting of the pelt and easy removal of the pelt after collapsing the pelt board. The high number of air apertures serving to allow air to circulate through the pelt board and further through the pelt allows for the drying air to be passed from the inside of the pelt board to the outside. The overall opening air layer of the overall transversal opening area of the pelt board is approximately 1200 mm 2  calculated as the open area. In the drying of the pelt, the air is, as is evident from  FIGS. 25 and 26  guided inside the pelt board along approximately 60% of the overall length of the pelt board and then transferred to the outer surface of the pelt board through the apertures shown in the enlarged views A and B of  FIG. 26 . 
       FIG. 28A  shows a perspective view of a part of a further embodiment of a pelt board  10   VII  in its contracted or non-expanded state. The pelt board  10   VII  resembles the above described embodiments  10   VI  shown in  FIGS. 20A, 20B, 20C, 21A, 21B, 22A, 22B, 23A, 23B and 23C . The part of the pelt board  10   VII  shown in  FIG. 28A  constitutes the lower part  12   I  of the pelt board, which is shown in  FIGS. 31A and 31B , which will be described in greater details below. 
     The lower part  12   I  of the pelt board  10   VII  is composed of a total of three components, namely two identically shaped shell parts  72  and  74  and a central elongated core element  26 . 
     Each of the shell parts  72  and  74  comprise a major low curvature wall part  22   I  and  20   I , respectively, and a minor high curvature wall part  18   I  and  16   I , respectively. The major low curvature wall parts  22   I  and  20   I  are joint to the minor high curvature parts  18   I  and  16   I , respectively, through imaginary lines  17   I  and  19   I , respectively. 
     The embodiment of the pelt board  10   VII  shown in  FIG. 28A  is of a structure, in which the two identically shaped shell parts  72  and  74  in the contracted or non-expanded state shown in  FIG. 28A  constitute an almost perfectly configured elliptical cross sectional configuration as the longitudinal edges of the oppositely positioned shell parts  72  and  74  join one another in a basically unbroken elliptically cross sectional configuration. The elliptical cross sectional configuration of the pelt board  10   VII  shown in  FIG. 28A  is believed to improve the ability of the pelt board to allow an easy removal of the pelt from the pelt board after the tanning of the pelt as the outer surface of the pelt board  10   VII  in its contracted or collapsed state is almost “perfectly” uniform without any substantive discontinuities. 
     In  FIG. 28B , the embodiment of the pelt board  10   VII  is shown in its expanded state, in which the two shell parts  72  and  74  are caused to be shifted away from one another establishing a gap between the edges of the oppositely positioned shell parts  72  and  74 . The shift of the shell parts  72  and  74  away from one another as illustrated in  FIG. 28B  and indicated by arrows is accomplished by shifting the central elongated core element  26  in a direction also indicated by an arrow inwardly into the interior of the pelt board  10   VII  forcing the shell parts  72  and  74  away from one another. 
     The separation or the shifting of the shell parts  72  and  74  is accomplished by means of cooperating actuator elements  34  and  36  shown in  FIG. 28C  identical to the actuator elements  34  and  36  shown in  FIG. 21B  and described above, the actuator elements  34  being constituted by triangularly shaped bodies extending inwardly from the central part of the major low curvature wall part  22   I  of the shell part  72  and likewise from the major low curvature wall part  20   I  of the shell part  74 , and the central elongated rod  26  is provided with actuator members  36  defining cooperating sloping cam surfaces with which the actuator members  34  cooperate for pushing the shell parts  72  and  74  away from one another to the expanded state shown in  FIG. 28C . 
     In  FIGS. 29A, 29B and 29C , a further embodiment of the pelt board  10   VIII  is shown having the same shell parts  72  and  74  as illustrated in  FIGS. 28A, 28B and 28C  as described above and the central elongated core element  26 . Whereas in  FIGS. 28B and 28C , the expansion of the pelt board is established as a vertical separation by pushing the shell parts away from one another, the second embodiment shown in  FIGS. 29A, 29B and 29C  establishes the expansion of the pelt board by shifting the shell parts  72  and  74  sidewise as illustrated in  FIG. 29B  and as accomplished by the cooperation between actuator members  34   I  and  36   I  shown in  FIG. 29C . To be more precise, in  FIG. 29B , the shell part  72  is shifted to the right and similarly, the shell part  74  is shifted to the left relative to the central elongated core elements  26 . 
     In  FIGS. 30A, 30B and 30C , a modified or alternative embodiment of the further embodiment  10   IX  shown in  FIGS. 29A, 29B and 29C , respectively, is illustrated differing from the above described further embodiment  10   VIII  in that the modified embodiment shifts the shell parts  72  and  74  in opposite directions as compared to the shifting shown in  FIG. 29B  and as illustrated in  FIG. 30B , the shell part  72  is shifted to the left and simultaneously, the shell  74  is shifted to the right as accomplished by the modified cooperating actuator members  34   II  and  36   II . 
     In  FIGS. 31A and 31B , the entire pelt board  10   VII  is shown having in addition to the lower part  12   I  shown in  FIG. 28A , an upper part  14  constituting a geometrical extension and continuation of the lower part  12   I  and having a tapering configuration. The upper part  14   I  also comprises two shell parts  28   I  and  30   I  which, like the shell parts  72  and  74  of the lower part  12 , are caused to be separated similar to the separation of the shell parts  72  and  74  of the embodiment  10   VII  described above with reference to  FIGS. 28A, 28B and 28C . It is readily understood that the separation of the two shell parts  28   I  and  30   I  of the upper part  28   I  is accomplished in the same manner as described above with reference to  FIGS. 28A, 28B and 28C  in relation to the lower part  12   I  of the pelt board  10   VII , and like the further embodiment  10   VIII  shown in  FIGS. 29A, 29B and 29C  and the modified embodiment  10   IX  shown in  FIGS. 30A, 30B and 30C , the complete pelt board  10   VII  shown in  FIGS. 31A and 31B  may be modified into establishing the sidewise expansion described above with reference to  FIGS. 29A, 29B and 29C  and also  FIGS. 30A, 30B and 30C . 
       FIG. 32  and  FIG. 33  illustrate in greater details a further embodiment  10   X  of the pelt board according to the present invention, which embodiment exhibits the highly advantageous feature of being composed of no more than three components, namely two identically shaped shell parts  72   I  and  74   I  and the central core element  36 . The shell parts  72   I  and  74   I  integrally comprise the shell parts  72 ,  72  and  28   I ,  30 , respectively, of the embodiment  10   VII  of the pelt board, as the shell parts  72  and  72  and similarly the shell parts  28   I  and  30   I  of the lower and upper parts  12   I  and  14   I , respectively, of the pelt board  10   VII  are constituted by a single integral component  72   I  and  74   I , respectively. Likewise, the central elongated core element serving to shift in a forced manner the shell parts  72   I  and  74 I from the contracted or non-expanded state to the expanded state and vice versa serve to engage with the actuator elements of the shell parts  72   I  and  74   I . 
       FIG. 34  shows a perspective view of a pelt board  10   II  which is accommodating a pelt  76 . The pelt  76  is stretched on the board and fastened in the stretched position by a clip  94  adjacent the tail part of the pelt  76 . The clip  94  is positioned above ribs  38  of the pelt board  10   II  which ribs  38  interacts with the clip  94  for retaining the pelt  76  on the pelt board  10   II . 
       FIG. 35A  shows a perspective view of the clip  94  of the previous figure. The clip  94  constitutes a strip of plastic material which is clamped onto the pelt  76  on the board  10   II . The clip  94  is straight when not applied to the pelt board. The clip  94  comprise a pair of opposing rigid fastening sections  96   96 ′, a pair of opposing flexible sections  98   98 ′ each connected to a fastening section and a rigid section  90  interconnecting the flexible sections  98   98 ′. The flexible sections  98   98 ′ may easily be bent such that the fastening sections  96   96 ′ meet about the pelt board  10   II . The fastening sections  96   96 ′ may be joined together by a screw or similar via a hole  96 ″. The combination of rigid sections and flexible sections allow the clip  94  to assume a substantially uniform fixation pressure on the pelt  76 . The clip  94  comprise gripping members  100  having a small spacing in-between themselves and the flexible section  98   98 ′ of the clip  94  comprise a larger spacing  92  between gripping members  100  in order to allow the flexible sections  98   98 ′ to be easily bent. 
       FIG. 35B  shows a close-up view of the clip  94 . The clip  94  comprises a plurality of gripping members  100  intended to face the pelt on the pelt board. The gripping members  100  define a small distance between themselves allowing hair to pass in between the gripping members  100 . Each of the gripping members  100  have a T-shape, i.e. a short and slender element extending outwardly from the clip  94  and a contact element extending parallel to the clip  94  at the outward end of the short and slender element and intended to be facing the pelt board  10   II . 
       FIG. 35C  shows a close-up view of the clip  94  and the pelt  76 . The clip  94  comprises gripping members  100  having the T-shape facing the pelt board  10   II . The T-shape of the gripping members  100  allow the gripping members  100  to penetrate the hair  102 ′ of the pelt  76  such that the inwardly oriented fixation pressure generated by the clip  94  is applied to the leather of the pelt  76  and not the hair of the pelt  76 . Thus, any deformation of the hair  102 ′ of the pelt is avoided. 
       FIG. 35D  shows a close-up view of the clip  94  at the flexible section  98  of the clip  94  comprising rounded gripping members  100  and spacing  92  between the gripping members to prevent squeezing of the hair  102  of the pelt  76  when the flexible section  98  are bend. 
       FIG. 36  is a view similar to the view of  FIG. 34  illustrating the pelt  76  onto which a fixation bag  106  is applied prior to the application of the strip onto the pelt  76 . 
     Although the present invention has above been described with reference to several advantageous embodiments, it would be evident to a person having ordinary skill in the art that numerous modifications and variants of the above technical disclosure may be deduced without deviating from the overall inventive concept as defined in the appending claims, and it would be evident to a person having ordinary skill in the art to deduce variants of the above described advantageous embodiments by combining the embodiments, i.e. by including features of one embodiment into a different embodiment. 
     REFERENCE NUMERALS USED IN THE DRAWINGS 
     
         
           10 . Pelt board 
           12 . Lower part 
           14 . Upper part 
           16 . First wall element 
           18 . Second wall element 
           20 . Third wall element 
           22 . Fourth wall element 
           24 . Cavity 
           26 . Elongated core element 
           28 . Fifth wall element 
           30 . Sixth wall element 
           32 . Extension element 
           34 . Actuator member 
           36 . Cooperating member 
           38 . Ribs 
           40 . Ventilation holes 
           42 . Snap fit mechanism 
           44 . Peripheral part 
           46 . Fastening member 
           48 . Track 
           50 . Clip-on mechanism 
           52 . Intermediate sections 
           54 . Fixed wall elements 
           56 . Ribs 
           58 . Opening 
           60 . Connecting element 
           62 . First locking protrusion 
           64 . Second locking protrusion 
           66 . Drying unit 
           68 . Ventilator 
           70 . Apertures 
           72 . Shell part 
           74 . Shell part 
           76 . clip 
           90 . Rigid section 
           92 . Spacing 
           94 . Clip 
           96 . Fixating section 
           98 . Flexible section 
           100 . Gripping member 
           102 . Hair 
           104 . Rounded gripping member 
           106 . Plastic bag.
 
First Set of Points Defining Features of the Invention
 
       
    
     1. An elongated pelt board for accommodating an animal pelt, the pelt board defining a longitudinal direction, a first radial direction perpendicular to the longitudinal direction and a second radial direction perpendicular to the longitudinal direction and the first radial direction, the pelt board comprising:
         a first wall element extending along the longitudinal direction and defining a first outwardly oriented surface, a first inwardly oriented surface, a first set of oppositely located longitudinal edges and a first actuator member,   a second wall element extending along the longitudinal direction and defining a second outwardly oriented surface, a second inwardly oriented surface facing the first inwardly oriented surface, a second set of oppositely located longitudinal edges and a second actuator member, the first and second wall elements being spaced apart in the first radial direction,   a third wall element extending along the longitudinal direction and defining a third outwardly oriented surface, a third inwardly oriented surface, a third set of oppositely located longitudinal edges and a third actuator member,   a fourth wall element extending along the longitudinal direction and defining a fourth outwardly oriented surface, a fourth inwardly oriented surface facing the third inwardly oriented surface, a fourth set of oppositely located longitudinal edges and a fourth actuator member, the third wall element and the fourth wall element being spaced apart in the second radial direction, the first inwardly oriented surface, the second inwardly oriented surface, the third inwardly oriented surface and the fourth inwardly oriented surface together defining a cavity along the longitudinal direction, the first wall element, the second wall element, the third wall element and the fourth wall element defining:   a contracted state in which the first radial distance between the first inwardly oriented surface and the second inwardly oriented surface is reduced, and, the second radial distance between the third inwardly oriented surface and the fourth inwardly oriented surface is reduced, and   an expanded state in which the first radial distance between the first inwardly oriented surface and the second inwardly oriented surface is increased, and, the second radial distance between the third inwardly oriented surface and the fourth inwardly oriented surface is increased, and   an elongated core element extending within the cavity along the longitudinal direction between a top end and a bottom end and being movable in relation to each of the first wall element, second wall element, third wall element and fourth wall element, the elongated core element comprising a first cooperating member interacting with the first actuator member of the first wall element, a second cooperating member interacting with the second actuator member of the second wall element, a third cooperating member interacting with the third actuator member of the third wall element and a fourth cooperating member interacting with the fourth actuator member of the fourth wall element for allowing the first wall element, the second wall element, the third wall element and the fourth wall element to selectively define the contracted state or the expanded state by moving the elongated core element in the longitudinal direction relative to the first wall element, the second wall element, the third wall element and the fourth wall element.       

     2. The pelt board according to point 1, wherein when in the contracted state, the first and second sets of oppositely located longitudinal edges overlapping respective edges of the third and fourth sets of oppositely located longitudinal edges or alternatively the third and fourth sets of oppositely located longitudinal edges overlapping respective edges of the first and second sets of oppositely located longitudinal edges, and, when in the expanded state the first and second sets of oppositely located longitudinal edges are substantially flush with respective edges of the third and fourth sets of oppositely located longitudinal edges. 
     3. The pelt board according to point 2, wherein any of the first wall element, the second wall element, the third wall element and/or the fourth wall element define a central part and a peripheral part, the peripheral part encompassing the set of edges, the central part and the peripheral part being flexibly joined together and when the first wall element, the second wall element, the third wall element and the fourth wall element define the contracted state the peripheral part assume an inwardly oriented position, whereas when the first wall element, the second wall element, the third wall element and the fourth wall element define the expanded state the peripheral part assume an outwardly oriented position. 
     4. The pelt board according to any of the preceding points, wherein the first actuator member and the second actuator member constitute pins and the first cooperating member and the second cooperating member constitute grooves, e.g. linear or curved grooves, in which the pins are guided between the contracted state and the expanded state, or, wherein the first cooperating member and the second cooperating member constitute pins and the first actuator member and the second actuator member constitute grooves, e.g. linear or curved grooves, in which the pins are guided between the contracted state and the expanded state. 
     5. The pelt board according to any of the preceding points, wherein the third actuator member and the fourth actuator member constitute wedge members for contacting the third cooperating member and the fourth cooperating member, or, wherein the third cooperating member and the fourth cooperating member constitute wedge members for contacting the third actuator member and the fourth actuator member. 
     6. The pelt board according to point 5, wherein the third actuator member and the fourth actuator members further engage the cooperating members opposite the elongated core element. 
     7. The pelt board according to any of the preceding points, wherein any of the first wall element, second wall element, third wall element and fourth wall element comprise ventilation grooves between the cavity and the outside of the pelt board, and/or, wherein the first wall element, the second wall element, the third wall element and the fourth wall element define an opening between the cavity and the outside of the pelt board at the bottom end for allowing ventilation air to enter the cavity, and/or wherein the third wall element and the fourth wall element are fixedly connected at the bottom end. 
     8. The pelt board according to any of the preceding points, wherein any of the first wall element, second wall element, third wall element and fourth wall element have an arched shape such that any of the first outwardly oriented surface, second outwardly oriented surface, third outwardly oriented surface and fourth outwardly oriented surface define a convex shape. 
     9. The pelt board according to any of the preceding points, wherein the first wall element defines a first radial edge adjacent the top end of the elongated core, the second wall element comprising a second radial edge adjacent the top edge of the elongated core, the pelt board further comprising:
         a fifth wall element adjacent to the first wall element at the first radial edge, the fifth wall element extending along the longitudinal direction and away from the second wall element, the fifth wall element defining a fifth outwardly oriented surface and a fifth actuator member,   a sixth wall element adjacent to the second wall element at the second radial edge, the sixth wall element extending along the longitudinal direction and away from the second wall element, the sixth wall element defining a sixth outwardly oriented surface and a sixth actuator member, the fifth and sixth wall elements being spaced apart in the first radial direction, and   a core extension element connected to the top end of the elongated core element and extending along the longitudinal direction away from the elongated core element, the core extension element being movable in relation to the fifth wall element and sixth wall element, the core extension element comprising a fifth cooperating member interacting with the fifth actuator member of the fifth wall element and a sixth cooperating member interacting with the sixth actuator member of the sixth wall element for allowing the fifth wall element and the sixth wall element to change between the contracted state and the expanded states by moving the elongated core element and the core extension element in the longitudinal direction relative to the first wall element, the second wall element, the third wall element, the fourth wall element, the fifth wall element and the sixth wall element.       

     10. The pelt board according to point 9, wherein the third wall element and the fourth wall element comprise opposing extension elements partially enclosing the core extension element. 
     11. The pelt board according to any of the points 9-10, wherein the pelt board comprises:
         a lower section including the first wall element, the second wall element, the third wall element, the fourth wall element and the elongated core element,   an upper section comprising the fifth wall element, the sixth wall element and the core extension element, and   an intermediate section located between the lower section and the upper section and comprising a core connecting element interconnecting the elongated core element and the core extension element, and a number of substantially elliptic cylindrical elements surrounding the core connecting element.       

     12. The pelt board according to any of the points 9-11, wherein the fifth cooperating member and the sixth cooperating member constitute pins and the fifth actuator member and the sixth actuator member constitute grooves, e.g. linear or curved grooves, in which the pins are guided between the contracted state and the expanded state, or, the fifth actuator member and the sixth actuator member constitute pins and the fifth cooperating member and the sixth cooperating member constitute grooves, e.g. linear or curved grooves, in which the pins are guided between the contracted state and the expanded state. 
     13. The pelt board according to any of the point 9-12, wherein the fifth wall element being connected to the first wall element at the first radial edge and the sixth wall element being connected to the second wall element at the second radial edge. 
     14. The pelt board according to any of the preceding points, wherein the elongated core element comprises a first protrusion adjacent the bottom end, the elongated core element being spring-loaded at the bottom end and defines a centralized relaxed position and a non-centralized loaded position in the first radial direction and/or second radial direction, the first wall element, the second wall element, the third wall element or the fourth wall element comprise a second protrusion cooperating with the first protrusion such that when the first wall element, the second wall element, the third wall element and the fourth wall element define the expanded state and the elongated core element define the centralized related position, the first and second protrusions prevent any longitudinal movement of the elongated core element, whereas when the elongated core element define the non-centralized loaded position, the first and second protrusions allow longitudinal movement of the elongated core element. 
     15. A method of manufacturing a pelt board for accommodating an animal pelt, the method comprising:
         providing a first wall element defining a first outwardly oriented surface, a first inwardly oriented surface, a first set of oppositely located longitudinal edges and a first actuator member,   providing a second wall element defining a second outwardly oriented surface, a second inwardly oriented surface, a second set of oppositely located longitudinal edges and a second actuator member,   providing a third wall element defining a third outwardly oriented surface, a third inwardly oriented surface, a third set of oppositely located longitudinal edges and a third actuator member,   providing a fourth wall element defining a fourth outwardly oriented surface, a fourth inwardly oriented surface, a fourth set of oppositely located longitudinal edges and a fourth actuator member,   providing an elongated core element comprising a first cooperating member, a second cooperating member, a third cooperating member and a fourth cooperating member,   positioning the first wall element, the second wall element, the third wall element and the fourth wall element along a longitudinal direction such that the first inwardly oriented surface is facing the second inwardly oriented surface and spaced apart along a first radial direction perpendicular to the longitudinal direction, the third inwardly oriented surface facing the fourth inwardly oriented surface and spaced apart along a second radial direction perpendicular to the longitudinal direction and the first radial direction, such that the first inwardly oriented surface, the second inwardly oriented surface, the third inwardly oriented surface and the fourth inwardly oriented surface together define a cavity along the longitudinal direction,   interacting the first cooperating member, the second cooperating member, the third cooperating member and the fourth cooperating member with the first actuator member of the first wall element, the second actuator member of the second wall element, the third actuator member of the third wall element and the fourth actuator member of the fourth wall element, respectively, and   moving the elongated core element in the longitudinal direction relative to the first wall element, the second wall element, the third wall element and the fourth wall element thereby causing the first wall element, the second wall element, the third wall element and the fourth wall element to move between a contracted state and an expanded state, when in the contracted state the first radial distance and the second radial distance between the first inwardly oriented surface and the second inwardly oriented surface, and, the third inwardly oriented surface and the fourth inwardly oriented surface, respectively, are reduced, whereas, when in the expanded state the first radial distance and the second radial distance between the first inwardly oriented surface and the second inwardly oriented surface, and, the third inwardly oriented surface and the fourth inwardly oriented surface, respectively, are increased.
 
Second Set of Points Defining Features of the Invention
       

     1. An elongated pelt board for accommodating an animal pelt, the pelt board defining a longitudinal direction, a first radial direction perpendicular to the longitudinal direction and a second radial direction perpendicular to the longitudinal direction and the first radial direction, the pelt board comprising:
         a first wall element extending along the longitudinal direction and defining a first outwardly oriented surface, a first inwardly oriented surface, a first set of oppositely located longitudinal edges and a first actuator member,   a second wall element extending along the longitudinal direction and defining a second outwardly oriented surface, a second inwardly oriented surface facing the first inwardly oriented surface, a second set of oppositely located longitudinal edges and a second actuator member, the first and second wall elements being spaced apart in the first radial direction,   a third wall element extending along the longitudinal direction and defining a third outwardly oriented surface, a third inwardly oriented surface, a third set of oppositely located longitudinal edges and a third actuator member,   a fourth wall element extending along the longitudinal direction and defining a fourth outwardly oriented surface, a fourth inwardly oriented surface facing the third inwardly oriented surface, a fourth set of oppositely located longitudinal edges and a fourth actuator member, the third wall element and the fourth wall element being spaced apart in the second radial direction, the first inwardly oriented surface, the second inwardly oriented surface, the third inwardly oriented surface and the fourth inwardly oriented surface together defining a cavity along the longitudinal direction, the first wall element, the second wall element, the third wall element and the fourth wall element defining:       

     a contracted state in which the first radial distance between the first inwardly oriented surface and the second inwardly oriented surface is reduced, and, the second radial distance between the third inwardly oriented surface and the fourth inwardly oriented surface is reduced, and
         an expanded state in which the first radial distance between the first inwardly oriented surface and the second inwardly oriented surface is increased, and, the second radial distance between the third inwardly oriented surface and the fourth inwardly oriented surface is increased, and   an elongated core element extending within the cavity along the longitudinal direction between a top end and a bottom end and being movable in relation to each of the first wall element, second wall element, third wall element and fourth wall element, the elongated core element comprising a first cooperating member interacting with the first actuator member of the first wall element, a second cooperating member interacting with the second actuator member of the second wall element, a third cooperating member interacting with the third actuator member of the third wall element and a fourth cooperating member interacting with the fourth actuator member of the fourth wall element for allowing the first wall element, the second wall element, the third wall element and the fourth wall element to selectively define the contracted state or the expanded state by moving the elongated core element in the longitudinal direction relative to the first wall element, the second wall element, the third wall element and the fourth wall element.       

     2. The pelt board according to point 1, wherein when in the contracted state, the first and second sets of oppositely located longitudinal edges overlapping respective edges of the third and fourth sets of oppositely located longitudinal edges or alternatively the third and fourth sets of oppositely located longitudinal edges overlapping respective edges of the first and second sets of oppositely located longitudinal edges, and, when in the expanded state the first and second sets of oppositely located longitudinal edges are substantially flush with respective edges of the third and fourth sets of oppositely located longitudinal edges. 
     3. The pelt board according to point 2, wherein any of the first wall element, the second wall element, the third wall element and/or the fourth wall element define a central part and a peripheral part, the peripheral part encompassing the set of edges, the central part and the peripheral part being flexibly joined together and when the first wall element, the second wall element, the third wall element and the fourth wall element define the contracted state the peripheral part assume an inwardly oriented position, whereas when the first wall element, the second wall element, the third wall element and the fourth wall element define the expanded state the peripheral part assume an outwardly oriented position. 
     4. The pelt board according to any of the preceding points, wherein the first actuator member and the second actuator member constitute pins and the first cooperating member and the second cooperating member constitute grooves, e.g. linear or curved grooves, in which the pins are guided between the contracted state and the expanded state, or, wherein the first cooperating member and the second cooperating member constitute pins and the first actuator member and the second actuator member constitute grooves, e.g. linear or curved grooves, in which the pins are guided between the contracted state and the expanded state. 
     5. The pelt board according to any of the preceding points, wherein the third actuator member and the fourth actuator member constitute wedge members for contacting the third cooperating member and the fourth cooperating member, or, wherein the third cooperating member and the fourth cooperating member constitute wedge members for contacting the third actuator member and the fourth actuator member. 
     6. The pelt board according to point 5, wherein the third actuator member and the fourth actuator members further engage the cooperating members opposite the elongated core element. 
     7. The pelt board according to any of the preceding points, wherein any of the first wall element, second wall element, third wall element and fourth wall element comprise ventilation grooves between the cavity and the outside of the pelt board, and/or, wherein the first wall element, the second wall element, the third wall element and the fourth wall element define an opening between the cavity and the outside of the pelt board at the bottom end for allowing ventilation air to enter the cavity, and/or wherein the third wall element and the fourth wall element are fixedly connected at the bottom end. 
     8. The pelt board according to any of the preceding points, wherein any of the first wall element, second wall element, third wall element and fourth wall element have an arched shape such that any of the first outwardly oriented surface, second outwardly oriented surface, third outwardly oriented surface and fourth outwardly oriented surface define a convex shape. 
     9. The pelt board according to any of the preceding points, wherein the first wall element defines a first radial edge adjacent the top end of the elongated core, the second wall element comprising a second radial edge adjacent the top edge of the elongated core, the pelt board further comprising:
         a fifth wall element adjacent to the first wall element at the first radial edge, the fifth wall element extending along the longitudinal direction and away from the second wall element, the fifth wall element defining a fifth outwardly oriented surface and a fifth actuator member,   a sixth wall element adjacent to the second wall element at the second radial edge, the sixth wall element extending along the longitudinal direction and away from the second wall element, the sixth wall element defining a sixth outwardly oriented surface and a sixth actuator member, the fifth and sixth wall elements being spaced apart in the first radial direction, and   a core extension element connected to the top end of the elongated core element and extending along the longitudinal direction away from the elongated core element, the core extension element being movable in relation to the fifth wall element and sixth wall element, the core extension element comprising a fifth cooperating member interacting with the fifth actuator member of the fifth wall element and a sixth cooperating member interacting with the sixth actuator member of the sixth wall element for allowing the fifth wall element and the sixth wall element to change between the contracted state and the expanded states by moving the elongated core element and the core extension element in the longitudinal direction relative to the first wall element, the second wall element, the third wall element, the fourth wall element, the fifth wall element and the sixth wall element.       

     10. The pelt board according to point 9, wherein the third wall element and the fourth wall element comprise opposing extension elements partially enclosing the core extension element. 
     11. The pelt board according to any of the points 9-10, wherein the pelt board comprises:
         a lower section including the first wall element, the second wall element, the third wall element, the fourth wall element and the elongated core element,   an upper section comprising the fifth wall element, the sixth wall element and the core extension element, and   an intermediate section located between the lower section and the upper section and comprising a core connecting element interconnecting the elongated core element and the core extension element, and a number of substantially elliptic cylindrical elements surrounding the core connecting element.       

     12. The pelt board according to any of the points 9-11, wherein the fifth cooperating member and the sixth cooperating member constitute pins and the fifth actuator member and the sixth actuator member constitute grooves, e.g. linear or curved grooves, in which the pins are guided between the contracted state and the expanded state, or, the fifth actuator member and the sixth actuator member constitute pins and the fifth cooperating member and the sixth cooperating member constitute grooves, e.g. linear or curved grooves, in which the pins are guided between the contracted state and the expanded state. 
     13. The pelt board according to any of the point 9-12, wherein the fifth wall element being connected to the first wall element at the first radial edge and the sixth wall element being connected to the second wall element at the second radial edge. 
     14. The pelt board according to any of the preceding points, wherein the elongated core element comprises a first protrusion adjacent the bottom end, the elongated core element being spring-loaded at the bottom end and defines a centralized relaxed position and a non-centralized loaded position in the first radial direction and/or second radial direction, the first wall element, the second wall element, the third wall element or the fourth wall element comprise a second protrusion cooperating with the first protrusion such that when the first wall element, the second wall element, the third wall element and the fourth wall element define the expanded state and the elongated core element define the centralized related position, the first and second protrusions prevent any longitudinal movement of the elongated core element, whereas when the elongated core element define the non-centralized loaded position, the first and second protrusions allow longitudinal movement of the elongated core element. 
     15. The elongated pelt board according to any of the preceding points, the first wall element, the second wall element, the third wall element and the fourth wall element further defining a first intermediate state in which the first radial distance between the first inwardly orientated surface and the second inwardly orientated surface is increased as compared to the contracted state. 
     16. The elongated pelt board according to any of the preceding points, the first wall element, the second wall element, the third wall element and the fourth wall element further defining a second intermediate state in which the second radial distance between third inwardly orientated surface and the fourth inwardly orientated surface is increased as compared to the contracted state. 
     17. The pelt board according to any of the preceding points,
         the first wall element defining a first edge among the first set of oppositely located longitudinal edges and the second wall element defining a second edge among the second set of oppositely located longitudinal edges, the first and second edges being positioned adjacent one another, and the first wall element and the second wall element being integrally connected along the first and second edges, and the third wall element defining a third edge among the third set of oppositely located longitudinal edges and the fourth wall element defining a fourth edge among the fourth set of oppositely located longitudinal edges, the third and fourth edges being positioned adjacent one another, and the third wall element and the fourth wall element being integrally connected along the third and fourth edges.       

     18. The pelt board according to point 17, the first actuator member and the second actuator member being constituted by a single first integral actuator member, and the third actuator member and the fourth actuator member being constituted by a single second integral actuator member. 
     19 A method of manufacturing a pelt board for accommodating an animal pelt, the method comprising:
         providing a first wall element defining a first outwardly oriented surface, a first inwardly oriented surface, a first set of oppositely located longitudinal edges and a first actuator member,   providing a second wall element defining a second outwardly oriented surface, a second inwardly oriented surface, a second set of oppositely located longitudinal edges and a second actuator member,   providing a third wall element defining a third outwardly oriented surface, a third inwardly oriented surface, a third set of oppositely located longitudinal edges and a third actuator member,   providing a fourth wall element defining a fourth outwardly oriented surface, a fourth inwardly oriented surface, a fourth set of oppositely located longitudinal edges and a fourth actuator member,   providing an elongated core element comprising a first cooperating member, a second cooperating member, a third cooperating member and a fourth cooperating member,   positioning the first wall element, the second wall element, the third wall element and the fourth wall element along a longitudinal direction such that the first inwardly oriented surface is facing the second inwardly oriented surface and spaced apart along a first radial direction perpendicular to the longitudinal direction, the third inwardly oriented surface facing the fourth inwardly oriented surface and spaced apart along a second radial direction perpendicular to the longitudinal direction and the first radial direction, such that the first inwardly oriented surface, the second inwardly oriented surface, the third inwardly oriented surface and the fourth inwardly oriented surface together define a cavity along the longitudinal direction,   interacting the first cooperating member, the second cooperating member, the third cooperating member and the fourth cooperating member with the first actuator member of the first wall element, the second actuator member of the second wall element, the third actuator member of the third wall element and the fourth actuator member of the fourth wall element, respectively, and   moving the elongated core element in the longitudinal direction relative to the first wall element, the second wall element, the third wall element and the fourth wall element thereby causing the first wall element, the second wall element, the third wall element and the fourth wall element to move between a contracted state and an expanded state, when in the contracted state the first radial distance and the second radial distance between the first inwardly oriented surface and the second inwardly oriented surface, and, the third inwardly oriented surface and the fourth inwardly oriented surface, respectively, are reduced, whereas, when in the expanded state the first radial distance and the second radial distance between the first inwardly oriented surface and the second inwardly oriented surface, and, the third inwardly oriented surface and the fourth inwardly oriented surface, respectively, are increased.
 
Third Set of Points Defining Features of the Invention
       

     1. An elongated pelt board for accommodating an animal pelt, the pelt board defining a longitudinal direction, a first radial direction perpendicular to the longitudinal direction and a second radial direction perpendicular to the longitudinal direction and the first radial direction, the pelt board comprising:
         a first wall element extending along the longitudinal direction and defining a first outwardly oriented surface, a first inwardly oriented surface, a first set of oppositely located longitudinal edges and a first actuator member,   a second wall element extending along the longitudinal direction and defining a second outwardly oriented surface, a second inwardly oriented surface facing the first inwardly oriented surface, a second set of oppositely located longitudinal edges and a second actuator member,   the first wall element and the second wall element being of identical configuration and each having a low curvature part and a high curvature part joint together along a line of junction extending generally in the longitudinal direction,   the low curvature part of the first wall element defining a first longitudinal edge of the first set of oppositely located longitudinal edges, the high curvature part of the first wall element defining a second longitudinal edge of the first set of oppositely located longitudinal edges, the low curvature part of the second wall element defining a first longitudinal edge of the second set of oppositely located longitudinal edges, the high curvature part of the second wall element defining a second longitudinal edge of the second set of oppositely located longitudinal edges, the first edge of the first wall element being positioned juxtaposed the second edge of the second wall element and the first edge of the second wall element being positioned juxtaposed the second edge of the first wall element, the first inwardly oriented surface and the second inwardly oriented surface together defining a cavity along the longitudinal direction,   the first wall element and the second wall element defining:   a contracted state in which the first radial distance between the first inwardly oriented surface and the second inwardly oriented surface is reduced, in which the first edge of the first wall element is positioned closely against the second edge of the second wall element, and in which the first edge of the second wall element is positioned closely against the second edge of the first wall element, and   an expanded state in which the first radial distance between the first inwardly oriented surface and the second inwardly oriented surface is increased, in which the first edge of the first wall element and the second edge of the second wall element is positioned in spaced apart relationship in the first radial direction, and in which the first edge of the second wall element and the second edge of the first wall element are positioned in spaced apart relationship and the first radial direction and   an elongated core element extending within the cavity along the longitudinal direction between a top end and a bottom end and being movable in relation to the first wall element and second wall element, the elongated core element comprising a first cooperating member interacting with the first actuator member of the first wall element and second cooperating member interacting with the second actuator member of the second wall element, for allowing the first wall element and the second wall element, to selectively define the contracted state or the expanded state by moving the elongated core element in the longitudinal direction relative to the first wall element and the second wall element.       

     2. An elongated pelt board for accommodating an animal pelt, the pelt board defining a longitudinal direction, a first radial direction perpendicular to the longitudinal direction and a second radial direction perpendicular to the longitudinal direction and the first radial direction, the pelt board comprising:
         a first wall element extending along the longitudinal direction and defining a first outwardly oriented surface, a first inwardly oriented surface, a first set of oppositely located longitudinal edges and a first actuator member,   a second wall element extending along the longitudinal direction and defining a second outwardly oriented surface, a second inwardly oriented surface facing the first inwardly oriented surface, a second set of oppositely located longitudinal edges and a second actuator member,   the first wall element and the second wall element being of identical configuration and each having a low curvature part and a high curvature part joint together along a line of junction extending generally in the longitudinal direction,   the low curvature part of the first wall element defining a first longitudinal edge of the first set of oppositely located longitudinal edges, the high curvature part of the first wall element defining a second longitudinal edge of the first set of oppositely located longitudinal edges, the low curvature part of the second wall element defining a first longitudinal edge of the second set of oppositely located longitudinal edges, the high curvature part of the second wall element defining a second longitudinal edge of the second set of oppositely located longitudinal edges, the first edge of the first wall element being positioned juxtaposed the second edge of the second wall element and the first edge of the second wall element being positioned juxtaposed the second edge of the first wall element, the first inwardly oriented surface and the second inwardly oriented surface together defining a cavity along the longitudinal direction,   the first wall element and the second wall element defining:   a contracted state in which the first radial distance between the first inwardly oriented surface and the second inwardly oriented surface is reduced, in which the first edge of the first wall element is positioned closely against the second edge of the second wall element, and in which the first edge of the second wall element is positioned closely against the second edge of the first wall element, and   an expanded state in which the first radial distance between the first inwardly oriented surface and the second inwardly oriented surface is increased, in which the first edge of the first wall element and the second edge of the second wall element is positioned in spaced apart relationship in the second radial direction, and in which the first edge of the second wall element and the second edge of the first wall element are positioned in spaced apart relationship and the second radial direction and   an elongated core element extending within the cavity along the longitudinal direction between a top end and a bottom end and being movable in relation to the first wall element and second wall element, the elongated core element comprising a first cooperating member interacting with the first actuator member of the first wall element and second cooperating member interacting with the second actuator member of the second wall element, for allowing the first wall element and the second wall element, to selectively define the contracted state or the expanded state by moving the elongated core element in the longitudinal direction relative to the first wall element and the second wall element.       

     3. The pelt board according to any of the preceding points, wherein the first actuator member and the second actuator member constitute pins and the first cooperating member and the second cooperating member constitute grooves, e.g. linear or curved grooves, in which the pins are guided between the contracted state and the expanded state, or, wherein the first cooperating member and the second cooperating member constitute pins and the first actuator member and the second actuator member constitute grooves, e.g. linear or curved grooves, in which the pins are guided between the contracted state and the expanded state. 
     4. The pelt board according to any of the preceding points, wherein the first wall element and the second wall element comprise ventilation grooves between the cavity and the outside of the pelt board. 
     5. The pelt board according to any of the preceding points, wherein the first wall element and the second wall element define an opening between the cavity and the outside of the pelt board at the bottom end for allowing ventilation air to enter the cavity. 
     6. The pelt board according to any of the preceding points, wherein the first wall element and the second wall element have an arched shape such that the first outwardly oriented surface and the second outwardly oriented surface define a convex shape. 
     7. The pelt board according to any of the preceding points, wherein the first wall element defines a first radial edge adjacent the top end of the elongated core and the second wall element defines a second radial edge adjacent the top edge of the elongated core, the pelt board further comprising:
         a third wall element adjacent to the first wall element at the first radial edge, the third wall element extending along the longitudinal direction and away from the second wall element, the third wall element defining a third outwardly oriented surface and a third actuator member,   a fourth wall element adjacent to the second wall element at the second radial edge, the fourth wall element extending along the longitudinal direction and away from the second wall element, the fourth wall element defining a fourth outwardly oriented surface and a fourth actuator member, the third and fourth wall elements being spaced apart in the first radial direction, and   a core extension element connected to the top end of the elongated core element and extending along the longitudinal direction away from the elongated core element, the core extension element being movable in relation to the third wall element and fourth wall element, the core extension element comprising a third cooperating member interacting with the third actuator member of the third wall element and a fourth cooperating member interacting with the fourth actuator member of the fourth wall element for allowing the third wall element and the fourth wall element to change between the contracted state and the expanded states by moving the elongated core element and the core extension element in the longitudinal direction relative to the first wall element, the second wall element, the third wall element and the fourth wall element.       

     8. The pelt board according to point 7, the first wall element and the third wall element being constituted by a first unitary wall element structure, the second wall element and the fourth wall element being constituted by a second unitary wall element structure and the core element and the core extension element being constituted by a single unitary core element structure. 
     9. The pelt board according to any of the points 7-8, wherein the pelt board comprises:
         a lower section including the first wall element and the second wall element and the elongated core element,   an upper section comprising the third wall element, the fourth wall element and the core extension element, and   an intermediate section located between the lower section and the upper section and comprising a core connecting element interconnecting the elongated core element and the core extension element.       

     10. The pelt board according to any of the point 7-9, wherein the third wall element being connected to the first wall element at the first radial edge and the fourth wall element being connected to the second wall element at the second radial edge. 
     11. The pelt board according to any of the points 7-9, wherein the third cooperating member and the fourth cooperating member constitute pins and the third actuator member and the fourth actuator member constitute grooves, e.g. linear or curved grooves, in which the pins are guided between the contracted state and the expanded state, or wherein the third actuator member and the fourth actuator member constitute pins and the third cooperating member and the fourth cooperating member constitute grooves, e.g. linear or curved grooves, in which the pins are guided between the contracted state and the expanded state. 
     12. The pelt board according to any of the preceding points, wherein the elongated core element comprises a first protrusion adjacent the bottom end, the elongated core element being spring-loaded at the bottom end and defines a centralized relaxed position and a non-centralized loaded position in the first radial direction and/or second radial direction, the first wall element and the second wall element comprise a second protrusion cooperating with the first protrusion such that when the first wall element and the second wall element define the expanded state and the elongated core element define the centralized related position, the first and second protrusions prevent any longitudinal movement of the elongated core element, whereas when the elongated core element define the non-centralized loaded position, the first and second protrusions allow longitudinal movement of the elongated core element. 
     13. A method of manufacturing a pelt board for accommodating an animal pelt, the method comprising:
         providing a first wall element defining a first outwardly oriented surface, a first inwardly oriented surface, a first set of oppositely located longitudinal edges and a first actuator member,   providing a second wall element defining a second outwardly oriented surface, a second inwardly oriented surface, a second set of oppositely located longitudinal edges and a second actuator member,   the first wall element and the second wall element being of identical configuration and each having a low curvature part and a high curvature part joint together along a line of junction extending generally in the longitudinal direction,   the low curvature part of the first wall element defining a first longitudinal edge of the first set of oppositely located longitudinal edges, the high curvature part of the first wall element defining a second longitudinal edge of the first set of oppositely located longitudinal edges, the low curvature part of the second wall element defining a first longitudinal edge of the second set of oppositely located longitudinal edges, the high curvature part of the second wall element defining a second longitudinal edge of the second set of oppositely located longitudinal edges, the first edge of the first wall element being positioned juxtaposed the second edge of the second wall element and the first edge of the second wall element being positioned juxtaposed the second edge of the first wall element, the first inwardly oriented surface and the second inwardly oriented surface together defining a cavity along the longitudinal direction,   providing an elongated core element comprising a first cooperating member and a second cooperating member,   positioning the first wall element and the second wall element along a longitudinal direction such that the first inwardly oriented surface is facing the second inwardly oriented surface and spaced apart along a first radial direction perpendicular to the longitudinal direction, such that the first inwardly oriented surface and the second inwardly oriented surface together define a cavity along the longitudinal direction,   interacting the first cooperating member and the second cooperating member with the first actuator member of the first wall element and the second actuator member of the second wall element, respectively, and   moving the elongated core element in the longitudinal direction relative to the first wall element and the second wall element causing the first wall element and the second wall element to move between a contracted state in which the first radial distance between the first inwardly oriented surface and the second inwardly oriented surface is reduced, in which the first edge of the first wall element is positioned closely against the second edge of the second wall element, and in which the first edge of the second wall element is positioned closely against the second edge of the first wall element, and   an expanded state in which the first radial distance between the first inwardly oriented surface and the second inwardly oriented surface is increased, in which the first edge of the first wall element and the second edge of the second wall element is positioned in spaced apart relationship in the first radial direction, and in which the first edge of the second wall element and the second edge of the first wall element are positioned in spaced apart relationship and the first radial direction.       

     14. A method of manufacturing a pelt board for accommodating an animal pelt, the method comprising:
         providing a first wall element defining a first outwardly oriented surface, a first inwardly oriented surface, a first set of oppositely located longitudinal edges and a first actuator member,   providing a second wall element defining a second outwardly oriented surface, a second inwardly oriented surface, a second set of oppositely located longitudinal edges and a second actuator member,   the first wall element and the second wall element being of identical configuration and each having a low curvature part and a high curvature part joint together along a line of junction extending generally in the longitudinal direction,   the low curvature part of the first wall element defining a first longitudinal edge of the first set of oppositely located longitudinal edges, the high curvature part of the first wall element defining a second longitudinal edge of the first set of oppositely located longitudinal edges, the low curvature part of the second wall element defining a first longitudinal edge of the second set of oppositely located longitudinal edges, the high curvature part of the second wall element defining a second longitudinal edge of the second set of oppositely located longitudinal edges, the first edge of the first wall element being positioned juxtaposed the second edge of the second wall element and the first edge of the second wall element being positioned juxtaposed the second edge of the first wall element, the first inwardly oriented surface and the second inwardly oriented surface together defining a cavity along the longitudinal direction,   providing an elongated core element comprising a first cooperating member and a second cooperating member,   positioning the first wall element and the second wall element along a longitudinal direction such that the first inwardly oriented surface is facing the second inwardly oriented surface and spaced apart along a first radial direction perpendicular to the longitudinal direction, such that the first inwardly oriented surface and the second inwardly oriented surface together define a cavity along the longitudinal direction,   interacting the first cooperating member and the second cooperating member with the first actuator member of the first wall element and the second actuator member of the second wall element, respectively, and   moving the elongated core element in the longitudinal direction relative to the first wall element and the second wall element causing the first wall element and the second wall element to move between a contracted state in which the first radial distance between the first inwardly oriented surface and the second inwardly oriented surface is reduced, in which the first edge of the first wall element is positioned closely against the second edge of the second wall element, and in which the first edge of the second wall element is positioned closely against the second edge of the first wall element, and   an expanded state in which the first radial distance between the first inwardly oriented surface and the second inwardly oriented surface is increased, in which the first edge of the first wall element and the second edge of the second wall element is positioned in spaced apart relationship in the second radial direction, and in which the first edge of the second wall element and the second edge of the first wall element are positioned in spaced apart relationship and the first radial direction.
 
Fourth Set of Points Defining Features of the Invention
       

     1. A system for drying a pelt, the system comprising a drying unit and a pelt board, the pelt having a substantially tubular shape defining an inwardly oriented leather side and an outwardly oriented fur side and further defining a nose end and a rear end,
         the pelt board defining a top end for accommodating and fixating the nose end of the pelt, a circumferential and apertured wall defining an inner cavity and an outer surface for facing the inwardly oriented leather side of the pelt and a bottom end opposite the top end, the pelt board defining an outer bottom end contour at the bottom end, the outer bottom end contour defining a bottom end area, the pelt board further having a connector extending outwardly from the bottom end and adapted for connecting the pelt board to the drying unit,   the drying unit having a housing defining a top surface and including a blower or communicating with a blower assembly for supplying air into the housing, the top surface defining a receptor aperture having a configuration matching the connector of the pelt board and serving to receive the connector for supporting the pelt board in an upright position relative to the top surface,   an air inlet being provided into the inner cavity at the bottom end of the pelt board for allowing air to be introduced into the inner cavity and to be forced out through the apertured wall for the drying of the inwardly oriented leather side of the pelt, the air inlet defining an inlet area constituting at least 15% of the bottom area of the pelt board and less than approximately 95% of the bottom area, and preferably more than 30% of the bottom area, such as further preferably approximately 45-50% of the bottom area of the pelt board, and   an air outlet being provided at the top surface of the housing for communicating with the air inlet and defining an outlet area constituting between 15% and 95% of the bottom area, such as preferably more than 30%, such as preferably 45-50% of the bottom area of the pelt board.       

     2. The aperture according to point 1, the air inlet area and the air outlet area being of the same size. 
     3. The system according to points 1 or 2, the air inlet being divided into sub air inlets circumferentially encircling the connector. 
     4. The system according to point 3, the air outlet circumferentially encircling the receptor aperture. 
     5. The system according to any of the points 1-4, the connector having inlet slots for allowing air to be introduced into the inner cavity from the housing of the drying unit through the slots. 
     6. The system according to any of the points 1-5, further comprising a first adaptor having an inlet end configured in conformity with the bottom end of the pelt board and having an opposite closed-off upper end, in which a minor air outlet aperture, such as an aperture of the size of 400 mm 2 , is provided for allowing air to be output through the minor air outlet aperture for input into a conventional pelt board having a smaller size connector through which air is input into the inner cavity of the pelt board through the connector, the first adaptor having a first inner air passage from the air inlet to the minor air outlet aperture. 
     7. The system according to any of the points 1-6, further comprising a second adaptor having an outlet configured in conformity with the bottom end of the pelt board and having an opposite closed-off bottom end, from which a smaller size connector extends, the smaller size connector having inlet slots for allowing air to be introduced into the inner space of the second adaptor through the smaller size connector, the second adaptor having a second inner air passage from the small size connector to the air outlet. 
     8. The system according to any of the points 1-7, further comprising a set of pelt boards and the housing of the drying unit having a plurality of receptor apertures and air outlets. 
     9. The system according to point 8, the drying unit having biased closing-off plates for closing off receptor apertures and corresponding air outlets in which receptor apertures no pelt board is received. 
     10. A drying unit for use in combination with a pelt board and for drying a pelt, the pelt having a substantially tubular shape defining an inwardly oriented leather side and an outwardly oriented fur side and further defining a nose end and a rear end,
         the drying unit having a housing defining a top surface and including a blower or communicating with a blower assembly for supplying air into the housing, the top surface defining a receptor aperture having a configuration matching a connector of the pelt board and serving to receive the connector for supporting the pelt board in an upright position relative to the top surface, and   an air outlet being provided at the top surface of the housing defining an outlet area constituting between 15% and 95% of the bottom area, such as preferably more than 30%, such as preferably 45-50% of the bottom area of the pelt board.       

     11. The drying unit according to point 10, the air outlet circumferentially encircling the receptor aperture. 
     12. The drying unit according to any of the points 10-11, further comprising a plurality of receptor apertures and air outlets. 
     13. The system according to point 12, the drying unit having biased closing-off plates for closing off receptor apertures and corresponding air outlets in which receptor apertures no pelt board is received. 
     14. A pelt board for use in combination with a drying unit for drying a pelt, the pelt having a substantially tubular shape defining an inwardly oriented leather side and an outwardly oriented fur side and further defining a nose end and a rear end,
         the pelt board defining a top end for accommodating and fixating the nose end of the pelt, a circumferential and apertured wall defining an inner cavity and an outer surface for facing the inwardly oriented leather side of the pelt and a bottom end opposite the top end, the pelt board defining an outer bottom end contour at the bottom end, the outer bottom end contour defining a bottom end area, the pelt board further having a connector extending outwardly from the bottom end and adapted for connecting the pelt board to the drying unit, and   an air inlet being provided into the inner cavity at the bottom end of the pelt board for allowing air to be introduced into the inner cavity and to be forced out through the apertured wall for the drying of the inwardly oriented leather side of the pelt, the air inlet defining an inlet area constituting at least 15% of the bottom area of the pelt board and less than approximately 95% of the bottom area, and preferably more than 30% of the bottom area, such as further preferably approximately 45-50% of the bottom area of the pelt board.       

     15. The pelt board according to point 14, the air inlet being divided into sub air inlets circumferentially encircling the connector. 
     16. The pelt board according to any of the points 14-15, the connector having inlet slots for allowing air to be introduced into the inner cavity. 
     17. An adaptor for use in combination with a drying unit for drying a pelt, and a pelt board, the pelt having a substantially tubular shape defining an inwardly oriented leather side and an outwardly oriented fur side and further defining a nose end and a rear end, the pelt board and the drying unit defining an air transfer area between the bottom end of the pelt board and an air outlet of the drying unit constituting between 15% and 95% of the bottom end area of the pelt board, such as preferably more than 30%, such as preferably 45-50% of the bottom area of the pelt board, the adaptor having an inlet end configured in conformity with the bottom end of the pelt board and having an opposite closed-off upper end, in which a minor air outlet aperture, such as an aperture of the size of 400 mm 2 , is provided for allowing air to be output through the minor air outlet aperture for input into a conventional pelt board having a smaller size connector through which air is input into the inner cavity of the pelt board through the connector, the first adaptor having an inner air passage from the air inlet to the minor air outlet aperture. 
     18. An adaptor for use in combination with a drying unit for drying a pelt, and a pelt board, the pelt having a substantially tubular shape defining an inwardly oriented leather side and an outwardly oriented fur side and further defining a nose end and a rear end, the pelt board having a smaller size connector at its bottom end, through which smaller size connector air is input into the inner cavity of the pelt board, and the drying unit having a minor receptor and air outlet aperture for receiving the smaller size connector, such as an aperture of the size of 400 mm 2 , the adaptor having an inlet end including the smaller size connector and having an opposite upper end, in which an air outlet aperture of the size of 1000 mm 2 -2500 mm 2  is provided for allowing air to be output through the air outlet aperture for input into a pelt board having an air inlet of the size of 1000 mm 2 -2500 mm 2  into an inner cavity of the pelt board, the adaptor having an inner air passage from the smaller size connector to the air outlet aperture. 
     19. A system for drying a pelt, the system comprising a drying unit and a pelt board, the pelt having a substantially tubular shape defining an inwardly oriented leather side and an outwardly oriented fur side and further defining a nose end and a rear end,
         the pelt board defining a top end for accommodating and fixating the nose end of the pelt, a circumferential and apertured wall defining an inner cavity and an outer surface for facing the inwardly oriented leather side of the pelt and a bottom end opposite the top end, the pelt board defining an outer bottom end contour at the bottom end, the outer bottom end contour defining a bottom end area,   the drying unit having a housing defining a top surface and including a blower or communicating with a blower assembly for supplying air into the housing,   an air inlet being provided into the inner cavity at the bottom end of the pelt board for allowing air to be introduced into the inner cavity and to be forced out through the apertured wall for the drying of the inwardly oriented leather side of the pelt, and   an air outlet being provided at the top surface of the housing for communicating with the air inlet via an interface there between, the interface establishing connection between the pelt board and the drying unit for supporting the pelt board in an upright position relative to the top surface defining an interface area constituting at least 15% of the bottom area of the pelt board less than approximately 95% of the bottom area, and preferably more than 30% of the bottom area, such as further preferably approximately 45-50% of the bottom area of the pelt board.       

     20. The aperture according to point 19, the interface being constituted by an interchangeable adaptor of the drying unit. 
     21. The system according to point 19 or 20, the interface circumferentially encircling the receptor and the receptor aperture. 
     22. The system according to any of the points 19-21, further comprising a set of pelt boards and the housing of the drying unit having a plurality of receptor apertures and air outlets. 
     23. A drying unit for use in combination with a pelt board and for drying a pelt, the pelt having a substantially tubular shape defining an inwardly oriented leather side and an outwardly oriented fur side and further defining a nose end and a rear end,
         the drying unit having a housing defining a top surface and including a blower or communicating with a blower assembly for supplying air into the housing, the top surface defining an interface relative to the pelt board for supporting the pelt board in an upright position relative to the top surface and for allowing air to be input to an inner cavity of the pelt board from the drying unit,   the interface defining an interface area between the pelt board and the top surface constituting between 15% and 95% of the bottom area of the pelt board, such as preferably more than 30%, such as preferably 45-50% of the bottom area of the pelt board.       

     24. The drying unit according to point 23, the interface being constituted by an interchangeable adaptor of the drying unit. 
     25. The drying unit according to any of the points 23-24, further comprising a plurality of interfaces for a corresponding plurality of pelt boards.