Patent Publication Number: US-2021180400-A1

Title: Mounting Element for Mounting an Architectural Covering Between Opposing Mounting Surfaces

Description:
TECHNICAL FIELD 
     The present disclosure relates to a mounting element for mounting an architectural covering, such as a blind, between two opposing mounting surfaces, e.g. by a force fit (frictional fit) and/or form fit (e.g. if the recess has matching female or male relief). Furthermore, the present disclosure relates to an architectural covering comprising such a mounting element. 
     BACKGROUND ART 
     US20140086676A1, which is incorporated herein by reference in its entirety, describes a so-called headrail for fixing an architectural covering in an architectural recess. The headrail of US20140086676A1 comprises an elongated member, for mounting the architectural covering in the architectural recess, and an extension mechanism manually moveable between a retracted state and an extended state. 
     However, the extension mechanism of US20140086676A1 is quite difficult to access, and hence difficult to manually operate. Moreover, the extension mechanism necessitates numerous components, which renders expensive the whole headrail. Besides, some of these components are relatively fragile and risk being broken after the extension mechanism has been operated several times. 
     SUMMARY 
     This Summary is not intended to identify key features or essential features of the claimed subject matter, nor is it intended as an aid in determining the scope of the claimed subject matter. 
     Disclosed herein is an improved mounting element, which alleviates the afore-mentioned drawbacks. Such drawbacks may be alleviated or reduced with a mounting element for mounting an architectural covering between two opposing mounting surfaces, the mounting element comprising:
         an elongate mounting member which is elongated along a longitudinal direction, and   an extension mechanism arranged at an end of the elongate mounting member, the extension mechanism being operable between: i) a retracted state, and ii) an extended state,       

     wherein the extension mechanism comprises:
         an actuator rotatable about a rotation axis, the rotation axis being substantially perpendicular to the longitudinal direction, and   a conversion mechanism configured to convert a rotation of the actuator into a translatory movement of the rotation axis along the longitudinal direction from the retracted state to the extended state and vice versa,   wherein the extension mechanism is arranged to abut one of the opposing mounting surfaces in the extended state when the mounting element is mounted between the opposing mounting surfaces.       

     Besides, another object is to provide a mounting element, for mounting an architectural covering between two opposing mounting surfaces, the mounting element comprising:
         an elongate mounting member which is elongated along a longitudinal direction, and   an extension mechanism arranged at an end of the elongate mounting member, the extension mechanism being operable between: i) a retracted state, and ii) an extended state,       

     wherein the extension mechanism comprises at least:
         an actuator displaceable by a force having at least one component orthogonal to the longitudinal direction, and   a conversion mechanism configured to convert a rotation of the actuator into a translatory movement of the rotation axis along the longitudinal direction from the retracted state to the extended state and vice versa,   wherein the extension mechanism is arranged to abut one of the opposing mounting surfaces in the extended state when the mounting element is mounted between the opposing mounting surfaces.       

     A second object is to provide a mounting element for mounting an architectural covering between two opposing mounting surfaces, the mounting element comprising: 
     i) an elongate mounting member which is elongated along a longitudinal direction, and
 
ii) a supplementary extension mechanism which is arranged at an end of the elongate mounting member, the supplementary extension mechanism being operable between:
 
i) a retracted state and ii) at least one extended state,
 
the supplementary extension mechanism comprising:
 
i) a supplementary actuator rotatable about a supplementary rotation axis, the supplementary rotation axis being substantially perpendicular to the longitudinal direction,
 
ii) a supplementary sliding portion arranged to translate along the longitudinal direction with respect to the elongate mounting member,
 
iii) a supplementary conversion mechanism configured to convert a rotation of the supplementary actuator into a translatory movement of the supplementary sliding portion along the longitudinal direction from the retracted state to an extended state and vice versa, and
 
wherein the supplementary extension mechanism is arranged to abut one of the opposing mounting surfaces.
 
     A third object is to provide a battery assembly intended to supply power to an electric motor in order to wind and unwind a covering member of an architectural covering, the battery assembly comprising: 
     i) a rechargeable battery pack for storing energy,
 
ii) an output connector for connection to the electric motor, and
 
iii) a charger plug configured to connect the rechargeable battery pack to a recharging power source,
 
wherein the rechargeable battery pack is configured to be completely accommodated in an elongate mounting member, e.g. a headrail, belonging to a mounting element of the architectural covering.
 
     All of the afore-mentioned objects and embodiments may form the subject-matter of a claim to patent protection, either in combination or independently. 
     This summary is given to aid understanding, and one of skill in the art will understand that each of the various aspects and features of the disclosure may advantageously be used separately in some instances, or in combination with other aspects and features of the disclosure in other instances. Accordingly, while the disclosure is presented in terms of embodiments, it should be appreciated that individual aspects of any embodiment can be claimed separately or in combination with aspects and features of that embodiment or any other embodiment. All of the embodiments and aspects mentioned in this disclosure may hence form the subject-matter of a claim to patent protection, either in combination or independently. 
     This summary is provided to introduce a selection of concepts in a simplified form that are further described below in the Detailed Description. This Summary is not intended to identify key features or essential features of the claimed subject matter, nor is it intended as an aid in determining the scope of the claimed subject matter. 
     The present disclosure is set forth in various levels of detail in this application and no limitation as to the scope of the claimed subject matter is intended by either the inclusion or non-inclusion of elements, components, or the like in this summary. In certain instances, details that are not necessary for an understanding of the disclosure or that render other details difficult to perceive may have been omitted. It should be understood that the claimed subject matter is not necessarily limited to the particular embodiments or arrangements illustrated herein. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       Further features, aspects, and advantages of the present disclosure will also become apparent from the following detailed description of embodiments, when read in conjunction with the exemplary drawings in which: 
         FIG. 1  is a schematic perspective view of a mounting element according to a first embodiment of the first object where an extension mechanism is placed in a retracted state; 
         FIG. 2  is a view similar to  FIG. 1 , where the extension mechanism is moving into an extended state; 
         FIG. 3  is a view similar to  FIG. 1 , where the extension mechanism is placed in an extended state; 
         FIG. 4  is a schematic perspective view of a part of an architectural covering and comprising the mounting element of  FIG. 1 ; 
         FIG. 5  is a schematic partly sectioned perspective view, along arrow V at  FIG. 4 ; 
         FIG. 6  is a schematic exploded perspective view of an extension mechanism belonging to the mounting element of  FIG. 1 ; 
         FIG. 7  is a view, on a larger scale, of detail VII at  FIG. 6 ; 
         FIG. 8  is a view, on a larger scale, of detail VIII at  FIG. 6 ; 
         FIG. 9  is a schematic assembled perspective view of the extension mechanism of  FIG. 6 ; 
         FIG. 10  is a schematic top view of an elongate mounting member belonging to the mounting element of  FIG. 1 ; 
         FIG. 11  is a schematic front view of the elongate mounting member of  FIG. 10 ; 
         FIG. 12  is a schematic sectional view, in a plane including the longitudinal direction, of the extension mechanism of  FIG. 9  placed in a retracted state; 
         FIG. 13  is a schematic sectional view, in a plane including the longitudinal direction, of the extension mechanism of  FIG. 9  placed in an extended state; 
         FIG. 14  is a schematic sectional view, in a plane parallel to the longitudinal direction, of the extension mechanism of  FIG. 9  placed in an extended state; 
         FIG. 15  is a schematic sectional view of part of a mounting element according to a second embodiment of the first object where an extension mechanism is placed in a retracted state; 
         FIG. 16  is a schematic sectional view of part of a mounting clement according to a third embodiment of the first object where an extension mechanism is placed in a retracted state; 
         FIG. 17  is a schematic top perspective view of a part of the mounting clement of  FIG. 1  and a supplementary extension mechanism according to a second object placed in an retracted state close to an opposing mounting surface; 
         FIG. 18  is a view similar to  FIG. 17 , where the supplementary extension mechanism is placed in an extended state; 
         FIG. 19  is schematic bottom perspective view of the part of the mounting clement of  FIG. 17 ; 
         FIG. 20  is schematic bottom perspective view of the part of the mounting element of  FIG. 18 ; 
         FIG. 21  is a schematic assembled perspective view of the supplementary extension mechanism; 
         FIG. 22  is a schematic exploded perspective view of the supplementary extension mechanism of  FIG. 21 ; 
         FIG. 23  is a schematic perspective view of a component belonging to the supplementary extension mechanism of  FIG. 21 ; 
         FIG. 24  is a schematic cross-section, along plane XXIV at  FIG. 23 , of the component of  FIG. 23 ; 
         FIG. 25  is a schematic cross-section, along plane XXV at  FIG. 17 , where the supplementary extension mechanism is placed in an retracted state close to an opposing mounting surface; 
         FIG. 26  is a view similar to  FIG. 25 , where the supplementary extension mechanism is heading for its extended state; 
         FIG. 27  is a view similar to  FIG. 25 , where the supplementary extension mechanism is placed in its extended state; 
         FIG. 28  is a schematic top partly exploded perspective view of the mounting element of  FIG. 1  and a battery assembly according to a third object; 
         FIG. 29  is a schematic top perspective view of the mounting element of  FIG. 28  showing the battery of  FIG. 28  in an assembled state; 
         FIG. 30  is an enlarged view of detail XXX at  FIG. 29 ; 
         FIG. 31  is a schematic top perspective view, along a direction opposite to  FIG. 31 , of the detail XXX; 
         FIG. 32  is a schematic bottom perspective view of the mounting element of  FIG. 29 ; 
         FIG. 33  is a schematic view similar to  FIG. 12  of a mounting element according to a fourth embodiment of the first object; 
         FIG. 34  is a schematic view similar to  FIG. 13  of the mounting clement of  FIG. 33 ; 
         FIG. 35  is a schematic top view along direction XXXV at  FIG. 33 ; 
         FIG. 36  is a schematic top view along direction XXXVI at  FIG. 34 ; 
         FIG. 37  is a schematic exploded view of a mounting element according to a fifth embodiment of the first object; 
         FIG. 38  is an enlarged view of the right-hand side of  FIG. 37 ; 
         FIG. 39  is a schematic perspective view of a part of an architectural covering and comprising a mounting clement according to a sixth embodiment of the first object; 
         FIG. 40  is a schematic sectional view, in plane XXXX at  FIG. 39 , of the mounting element of  FIG. 39  in an installed configuration; 
         FIG. 41  is a side view of a component of the mounting element of  FIG. 39 ; 
         FIG. 42  is a partially exploded view of the mounting element of  FIG. 39 ; 
         FIG. 43  is a top view of the mounting element of  FIG. 39 ; 
         FIG. 44  is a schematic perspective view of a part of an architectural covering and comprising a mounting element according to a seventh embodiment of the first object; 
         FIG. 45  is a schematic sectional view, in a plane perpendicular to the longitudinal direction at  FIG. 39 , of the mounting clement of  FIG. 44  in an installed configuration; 
         FIG. 46  is a perspective view of the mounting element of  FIG. 44 ; and 
         FIG. 47  is a top view of the mounting element of  FIG. 39 . 
     
    
    
     The accompanying drawings are provided for purposes of illustration only, and the dimensions, positions, order, and relative sizes reflected in the drawings attached hereto may vary. The detailed description will be better understood in conjunction with the accompanying drawings. Reference now will be made in detail to embodiments of the present subject matter, one or more examples of which are illustrated in the drawings. Each example is provided by way of explanation of the present subject matter, not limitation of the present subject matter. In fact, it will be apparent to those skilled in the art that various modifications and variations can be made in the present disclosure without departing from the scope or spirit of the present subject matter. Fur instance, features illustrated or described as part of one embodiment can be used with another embodiment to yield a still further embodiment. Thus, it is intended that the present subject matter covers such modifications and variations as come within the scope of the appended claims and their equivalents. 
     DETAILED DESCRIPTION 
     The afore-mentioned and other features and advantages of the present disclosure will be readily apparent from the following detailed description, the scope of the invention being set out in the appended claims. 
     In an improvement according to the afore-detailed first object, the actuator enables a user to easily fasten the mounting element supporting a covering between two opposing mounting surfaces. Indeed, the user only needs to grasp the actuator and rotate it to place the extension mechanism in the extended state. With one hand a user can hold the mounting element at its mounting position and, with its other hand, the user can operate the actuator so as to fasten the mounting element between two opposing mounting surfaces. 
     Once fastened, the mounting element achieves a force fit (frictional fit) between two opposing mounting surfaces. The mounting element may alternatively or complementarity achieve a form fit, for example if one of the opposing mounting surfaces has matching female or male reliefs. 
     According to an aspect, the rotation axis is transverse to the longitudinal direction, when viewed in a plane parallel to the longitudinal direction. The rotation axis may form an angle ranging from 80 degrees to 100 degrees with respect to the longitudinal direction. For example, the rotation axis may be orthogonal to the longitudinal direction, in which case the actuator rotates along a plane which includes the longitudinal direction. 
     According to an aspect, the rotation axis may intersect the longitudinal direction. Alternatively, the rotation axis may not intersect the longitudinal direction. 
     The elongate mounting member can withstand the weight of the whole architectural covering and withstand the forces resulting from the extension mechanism being in the extended state. Advantageously, the elongate mounting member is rigid or stiff enough to sustain the architectural covering while spanning the gap between the opposing mounting surfaces. 
     According to an aspect, the elongate mounting member is made of a single component. Thus, the mounting clement can form a rail, for example a headrail. Alternatively to this aspect, the elongate mounting member may be made of several parts coupled together. 
     The components of the extension mechanism may be composed of metallic and/or of plastic materials. 
     Throughout the present application the term “along” means either substantially “parallel to” or substantially “collinear with”. 
     According to an embodiment, the conversion mechanism may further comprise a compression part configured to transmit a compression force along the longitudinal direction towards the opposing mounting surface. 
     Thus, the translatory movement of conversion mechanism makes it possible to frictionally hold the mounting element between the two opposing mounting surfaces. 
     According to an aspect of this embodiment, the compression part may substantially have a prismatic shape extending along a longitudinal direction. The compression part may comprise an abutment part arranged to receive an end of the biasing part. Alternatively, the compression part may substantially have a cylindrical shape extending along a longitudinal direction. 
     According to an embodiment, the conversion mechanism may comprise a biasing part mechanically connected to the actuator, the biasing part being configured to generate the compression force when the extension mechanism is in the extended state. 
     Thus, such a biasing part can easily generate the compression force by simply being elastically deformed by the actuator. 
     According to an aspect of this embodiment, the biasing part may be elastically deformable and configured to be more stressed when the extension mechanism is in the extended state than in the retracted state so as to generate the compression force. 
     According to an aspect of this embodiment, the biasing part may be selected to have a deformation distance ranging from 10 mm to 100 mm, the deformation distance being measured as the length difference of the biasing part between the extended state and the retracted state. 
     According to an aspect of this embodiment, the compression part and the biasing part may be separate components. Alternatively, the compression part may be integral with the biasing part. For example, the compression part and the biasing part may be made of one-piece, for example composed of an elastomeric material. 
     According to an aspect of this embodiment, the biasing part may comprise at least one compression spring. 
     According to an embodiment, the biasing part may comprise at least two compression springs arranged in parallel and preferably laterally spaced apart from each other. 
     Thus, parallel compression springs make it possible to minimize the overall dimension of the mounting element along the longitudinal direction. 
     The/each compression spring may comprise a helical spring, which can be easily designed and assembled into the extension mechanism and which can have a very long service life. 
     Alternatively, the compression spring may be comprised of an elastomeric material. 
     According to an aspect of this embodiment, the conversion mechanism may further comprise at least one ring arranged between the actuator and the at least one compression spring. Such a ring may be configured to maximize the interface between the actuator and the at least one compression spring. In service, such a ring hence distributes the reaction force of the biasing part on the actuator. 
     According to an embodiment, the actuator may directly actuate the biasing part. 
     Thus, the extension mechanism can be very compact. 
     Alternatively, the actuator may indirectly actuate the biasing part, for example where the extension mechanism comprises at least one intermediary component interposed between the actuator and the biasing part. 
     According to an embodiment, the compression part may be configured so as to transmit, towards an opposing mounting surface, a compression force that is applied below the longitudinal centerline of the elongate mounting member, when the extension mechanism reaches its extended state. 
     According to an embodiment, the conversion mechanism may further comprise a connection member mechanically linked: 
     i) to the elongate mounting member so as to rotate between the retracted state and the extended state, and 
     ii) to the actuator so as to guide the actuator in rotation. 
     Thus, such a connection member can guide in rotation the actuator and facilitate the implementation of the actuator into the extension mechanism. 
     According to an embodiment, the actuator and the connection member may have substantially elongated shapes, the actuator and the connection member being substantially parallel when the extension mechanism is in the extended state. 
     Thus, such elongated actuator and connection member help keep the extension mechanism compact when viewed in a plane perpendicular to the longitudinal direction. 
     According to an aspect of this embodiment, the connection member may be a rod. 
     According to an embodiment, the connection member may be hinged to the elongate mounting member so as to rotate about a connection axis which is orthogonal to the longitudinal direction. 
     Thus, such a hinged connection member can easily be moved between the retracted state and the extended state. 
     Alternatively, the connection member may be linked to the elongate mounting member so as to move, concomitantly to its rotation, in translation along the longitudinal direction. 
     According to an embodiment, the connection member and the actuator may be linked by means of at least: i) a linkage pin and ii) a curvilinear bearing portion arranged to guide the at least one linkage pin. 
     Thus, such linkage pin and curvilinear bearing portion form an inexpensive yet accurate rotatable link between the connection member and the actuator. 
     According to an aspect of this embodiment, the connection member and the actuator may be linked by means of two linkage pins and two curvilinear bearing portions arranged to respectively guide the linkage pins. 
     According to an aspect of this embodiment, the curvilinear bearing portion may have the form of a circular arc. For example, the circular arc may extend over an angle ranging from 45 degrees to 120 degrees. 
     According to an embodiment, the linkage pin may protrude on a lateral face of the connection member, and the curvilinear bearing portion may extend on a side face of the actuator 
     Alternatively, the linkage pin may protrude on a side face of the actuator and the curvilinear hearing portion may extend on a lateral face of the connection member. 
     According to an aspect, the extension mechanism may be arranged in the extended state such that the actuator is locked against its rotation from the extended state to the retracted state. 
     According to an embodiment, the actuator, the biasing part, and the connection member may be arranged so that the biasing part exerts a locking torque on the actuator about the connection axis, said locking torque being oriented counter the rotation direction of the actuator from the extended state to the retracted state. 
     Thus, such an arrangement prevents the extension mechanism from unwittingly returning into the retracted state once it has been placed by the user in the extended state. 
     According to an aspect of this embodiment, the actuator, the biasing part, and the connection member may be arranged such that: 
     the mechanical link between the actuator and the connection member is located on the other side, 
     with respect to the mechanical link between the actuator and the connection member when the extension mechanism is in the extended state, 
     of a segment connecting: a) the center of rotation of the connection member relative to the elongate mounting member, to b) the point of the actuator where is exerted the resultant of the reaction force generated by the biasing part. 
     According to an embodiment, the actuator may be at least partly arranged between the connection member and the biasing part. 
     According to an aspect of this embodiment, the guide may be configured to guide the compression part in translation along the longitudinal direction. 
     According to an embodiment, the actuator may have a pushing portion arranged to push the conversion mechanism, the pushing portion being moveable in translation along the longitudinal direction and in rotation. 
     According to au embodiment, the conversion mechanism may further comprise a guide having at least one guiding slot which extends at least partly along the longitudinal direction, and the actuator further may comprise at least one pin configured to slidingly and rotatably move in the at least one guiding slot. 
     Thus, such pin and guiding slot enable translation and rotation of the actuator. 
     Throughout the present application the adjective “longitudinal” characterizes an element, for example the guiding slot, which extends substantially parallel to the longitudinal direction along which the elongate mounting member is elongated. 
     According to an aspect of this embodiment, the guide may have two guiding slots arranged on two sides of the guide, and the actuator may have two pins configured to slidingly and rotatably move respectively in the two guiding slots. 
     According to an aspect of this embodiment, the at least one guiding slot fully extends along the longitudinal direction. 
     According to an embodiment, the actuator may be configured to be manually movable. Thus, a user can move the actuator manually in order to operate the extension mechanism between the retracted state and the extended state. According to an aspect, the actuator may comprise a lever. Such a lever may be formed by an elongate component, like an elongate profile. As the actuator is rotatable with respect to the elongate mounting member, the lever provides a lever arm to operate the conversion mechanism. 
     According to an aspect of this embodiment, the actuator may comprise a control portion which is arranged for an actuation of the actuator. 
     Thus, such a control portion makes it easy for a user to grasp and operate the actuator. 
     According to an aspect of this embodiment, the control portion may be distant from the pushing portion. For example, the pushing portion may be located on one end of the actuator whereas the control portion may be located in a median region of the actuator or on the other end of the actuator. 
     According to an embodiment, the actuator may protrude from the elongate mounting member when the extension mechanism is in the retracted state. 
     Thus, a user can easily reach for the actuator in order to place the extension mechanism in its extended state. 
     According to an embodiment, the connection member may herein comprise a rod. 
     According to an embodiment, the mounting element may further comprise a friction member arranged on an outer end portion of the extension mechanism so as to bear against the opposing mounting surfaces when the extension mechanism is in the extended state, the friction member being mechanically linked to the conversion mechanism such that the friction member converts a part of the translatory movement into an upwardly-oriented friction force when the friction member bears against the two opposing mounting surfaces. 
     Thus, such a friction member makes it possible to fasten the mounting element between two opposing mounting surfaces, because of the upwardly-oriented friction force. 
     According to an aspect of this embodiment, the friction member may be arranged to protrude from the outer end portion of the extension mechanism when The extension mechanism is in the extended state. However, depending on the play between the opposing mounting surfaces and the mounting element, the friction member may protrude only on a small scale. 
     According to an aspect of this embodiment, the friction member may be composed of at least one friction material selected within the group consisting of elastomers and plastics. Alternatively to this aspect, the friction member may be composed of another material provided the friction member has a surface roughness selected to convert the translatory movement into the upwardly-oriented friction force. The friction member may be elastic or resilient due to its material and/or due to its shape. 
     Alternatively to this embodiment, a friction pad may already be secured to the opposing mounting surfaces, for example by means of double-sided tape or glue, in which case the mounting element does not need to comprise a friction member. 
     According to an aspect of this embodiment, the friction member may be integral with the compression part. According to an aspect of this embodiment, the friction member and the compression part may be made as a single piece. 
     According to an aspect of this embodiment, the friction member may be secured directly to the compression part. Alternatively to this aspect, at least one element may be interposed between the friction member and the compression part, in which case the friction member may be secured indirectly to the compression part. 
     Alternatively to this embodiment, the friction member and the compression part may be separate components. 
     According to an embodiment, the elongate mounting member may comprise a housing part configured to substantially accommodate the extension mechanism in the extended state. 
     Thus, such a housing part enables design of a compact mounting element. Furthermore, such a housing part protects the actuator and the connection member. 
     The elongate mounting member may advantageously be configured to hold all the components of the architectural covering. In particular, the elongate mounting member may hold the extension mechanism, a covering member, and an electric motor for winding and unwinding the covering member. 
     According to an aspect of this embodiment, the housing part may be configured to fully accommodate the extension mechanism in the extended state. 
     According to an aspect, the mounting element may further comprise a supplementary friction member arranged on an end portion of the elongate mounting member opposite the extension mechanism so as to bear against the opposing mounting surfaces, the supplementary friction member being configured to convert a part of the translatory movement into an upwardly-oriented friction force when the supplementary friction member bears against the opposing mounting surfaces. 
     According to an aspect, the elongate mounting member may comprise mounting clips arranged to help mount, for example, a horizontal blind or a roman blind onto the mounting element so as to install an architectural covering. 
     Thus, the actuator enables a user to easily fasten the mounting element between two opposing mounting surfaces. Indeed, the user only needs to impart the force to the actuator so as to place the extension mechanism in the extended state With one hand a user can hold the mounting clement at its mounting position and. with its other hand, the user can impart the force to the actuator such that the extension mechanism abuts one of the opposing surfaces, so as to fasten the mounting element in the architectural recess. 
     Furthermore, another object is an architectural covering comprising a covering member for covering an architectural opening, wherein the architectural covering is equipped with a mounting element according to the present disclosure. Thus, such an architectural covering can be quickly and reliably installed by hand, hence without tool, within an architectural recess having two opposing mounting surfaces. 
     In an improvement according to the afore-detailed second object, the supplementary extension mechanism may comprise a supplementary compression part configured to transmit a compression force along the longitudinal direction towards the opposing mounting surface. Such a compression force helps hold the mounting element, because it helps generate a friction force against the opposing mounting surfaces. 
     According to an aspect, the supplementary compression part may have a prismatic shape extending along the longitudinal direction. In particular, the translatory movement of the supplementary extension mechanism may develop along the longitudinal direction. 
     According to an aspect, the supplementary conversion mechanism may be configured to cooperate with the supplementary actuator. In a particular aspect, the supplementary conversion mechanism may comprise a driven portion, which is last in translation with the supplementary sliding portion, and several driving surfaces which are fast in rotation with the supplementary actuator and which are configured to cooperate selectively with driven portion. 
     According to a further aspect, the driven portion may have a semi-cylindrical male cross-section, the shape of which is substantially complementary to each one of the driving surfaces, such that each one of the driving surfaces may selectively drive the driven portion in translation along a longitudinal direction. In a particular aspect, the driving surfaces may be arranged such that each one of the driving surfaces extends substantially perpendicularly to its adjacent driving surfaces. 
     According to a further aspect, the supplementary actuator may have an actuating portion configured to actuate the supplementary actuator. In a particular aspect, the actuating portion may have a slot configured to receive a tool, for example a screwdriver, such that a user may exert a torque on the tool to impart rotation to the supplementary actuator about the supplementary rotation axis, selectively clockwise or counterclockwise. Advantageously, the elongate mounting member may have an opening, e.g. a hole, configured to make the slot accessible to a tool from outside, say from under, the elongate mounting member. 
     According to a further aspect, the supplementary actuator is configured such that the slot has a geometric center substantially located on the rotation axis, the driving surfaces being located at different respective distances from the geometric center. As a result, when the driven portion bears against a given driving surface, the outer end of the supplementary compression part is further from the opposing mounting surface than when the driven portion bears against another driving surface. 
     According to an aspect, the supplementary actuator may comprise a ratchet wheel having several notches on its periphery, the supplementary conversion mechanism may comprise at least one pawl, e.g. two pawls, configured to fall within the notches, the ratchet wheel and the or each pawl being configured to cooperate such that the or each pawl may fall into a respective notch, so as to prevent rotation of the supplementary actuator. 
     In a particular aspect, the or each pawl may selectively release the ratchet wheel, such that the supplementary actuator may rotate about the supplementary rotation axis. In a particular aspect, the ratchet wheel and the or each pawl are configured so as to define four discrete, stable positions of the supplementary actuator about the supplementary rotation axis, the discrete, stable positions being defined such that two successive driving surfaces are separated by a 90 degree angle. 
     In an improvement according to the afore-detailed third object, the rechargeable battery pack may be comprised of several batteries which may be arranged in a series, parallel or a mixture thereof. 
     According to an aspect, the rechargeable battery pack may be secured to elongate mounting member so as to prevent the user from removing the rechargeable battery pack out of the elongate mounting member. Advantageously, the battery assembly may comprise securing elements configured to secure the rechargeable battery pack to the elongate mounting member in a non-detachable manner. In a particular aspect, the elongate mounting member may have a housing space configured to accommodate totally or partially the rechargeable battery pack. 
     According to an aspect, the elongate mounting member may be configured so that the charger plug is accessible from outside the elongate mounting member. Advantageously, the elongate mounting member may comprise a hole for accessing the charger plug. 
     Thus, when the rechargeable battery pack needs to be recharged, the user may: i) either plug in a charger while the mounting element remains mounted, ii) or remove the whole mounting element and displace it to get the rechargeable battery pack recharged at a dedicated charging installation. 
     As an additional or independent object of the present invention, the application is also directed to a mounting element, for mounting an architectural covering between two opposing mounting surfaces, the mounting element comprising an elongate mounting member, which is elongated along a longitudinal direction, and an extension mechanism, which may be arranged at an end of the elongate mounting member, the extension mechanism being operable between: i) a retracted state, and ii) an extended state, wherein the extension mechanism may comprise a compression part, wherein the compression part may be configured so as to transmit, towards au opposing mounting surface, a compression force that is applied below the longitudinal centerline of the elongate mounting member, when the extension mechanism reaches its extended state. 
     According to an embodiment, the extension mechanism includes a conversion mechanism which may be equipped with the compression part, the compression part being configured to transmit a compression force along the longitudinal direction towards the opposing mounting surface. 
     According to an embodiment, the mounting element may include a lateral flange, which is configured to come out of a front side of the recess. Optionally, the lateral flange may be configured to extend along an upper front surface of the wall the recess is located in. 
     According to an aspect, the lateral flange may be configured to connect the elongate mounting member to the covering member. Further, the lateral flange may be configured to support the covering member above the level of the elongate mounting member when the mounting element is fastened to the opposing mounting surfaces. The covering member and the elongate mounting member may extend along respective axes which are offset in a direction perpendicular the longitudinal direction. Thus, the covering member can be mounted above and in front of the recess. Thus, the windows may be opened inwards and under the rolled-up covering member. Also, the covering member may extend beyond the opposing mounting surfaces both in the longitudinal direction and on top of the recess. Thus, a length of the covering member may be larger than a length of the recess. This ensures there is no or minimal light gap around the side edges of the covering member. 
     According to an aspect, the architectural covering may be mounted between the opposing mounting surfaces. The elongate mounting member may extend along the longitudinal direction. 
     According to an aspect, the lateral flange may be integral, advantageously one-piece, with the elongate mounting member. The lateral flange may be substantially comprised of a plate, which extends vertically when the mounting element is fastened to the opposing mounting surfaces. Alternatively, the lateral flange and the elongate mounting member may be two separate components that are coupled by suitable fastening elements. Such suitable fastening elements may form a permanent coupling, like rivets, or a dismountable coupling, like bolts. Alternatively, the lateral flange and the elongate mounting member may be fastened by snap fit or friction fit, thus without separate, additional fastening elements. 
     According to an aspect, the covering member may be a roller blind. Alternatively, the covering member may be a Venetian blind, a pleated blind, a honeycomb blind, roman shades etc. 
     According to an aspect, the lateral flange may be configured to support an covering member beside, e.g. level with, the elongate mounting member when the mounting element is fastened to the opposing mounting surfaces. The lateral flange may be configured to protrude away from the recess when the mounting element is fastened to the opposing mounting surfaces. For example, the lateral flange may extend substantially horizontally or obliquely upwards. 
     According to an aspect, the mounting element may include two holding flanges, which are configured to couple the lateral flange to the covering member so as to hold the covering member. Each one of the holding flanges may substantially include a holding portion, which is configured to hold a respective end of the covering member. The holding portions may include brackets or clips. Each one of holding flanges may substantially include a coupling portion, which is configured to be coupled to the lateral flange. The longitudinal ends of the lateral flange may define two respective slots, which open outwards and are configured to receive a respective coupling portion. Each one of the holding flanges may substantially have an L-shape, which is defined by the holding portion and the coupling portion which respectively extend perpendicularly to each other. 
     In service, in order to assemble coupling portions to the lateral flange, an operator may insert the coupling portions respectively into the slots in the longitudinal direction. Each coupling portion may have a tapered end portion in order to facilitate the insertion into the respective slot. Each coupling portion may have abutment surfaces that are arranged to abut on respective edges of the lateral flange, so as to stop the respective coupling portion at a predetermined position in the longitudinal direction. 
     According to an aspect, the edges of the coupling portions may have indentations arranged to secure each coupling portion to the lateral flange. For example, the indentations may allow the lateral flange to be plastically deformed into the indentations so as to permanently fasten the coupling portions to lateral flange. In a oat shown alternative embodiment, the indentations may cooperate with an elastically deformable part of the lateral flange so as to clip the coupling portions to the lateral flange. 
     According to an aspect, the covering member may be a Venetian blind. Further, the mounting element may include two supporting flanges, which are configured to support the covering member. Each supporting flange may be fastened to the lateral flange by any suitable fastening element, e.g. screws, rivets or welds. The supporting flanges may be configured to cooperate by clipping into a frame of the venetian blind and have at least one lever configured to release the clipping connection. 
     Some embodiments will now be described with reference to the exemplary drawings, in which like reference signs refer to like parts or features. 
       FIGS. 1 to 5  depict a mounting element  101  for mounting an architectural covering  200  in an architectural recess  300  which is formed by a window opening frame having two opposing mounting surfaces  302  and  304 . The architectural covering  200  comprises the mounting element  101 . The mounting element  101  comprises an elongate mounting member  102  and an extension mechanism  104 . 
     The elongate mounting member  102  is configured to mount the architectural covering  200  between opposing mounting surfaces  302  and  304 . In the illustrated embodiment, elongate mounting member  102  holds all the components of architectural covering  200 , in particular the extension mechanism  104 , a covering member  202  and a not shown electric motor for winding and unwinding the covering member  202 . 
     Elongate mounting member  102  is elongated along a longitudinal direction X 102  extending across architectural recess  300 , such that elongate mounting member  102  substantially spans the distance between the opposing mounting surfaces  302  and  304 , hence the length of architectural recess  300 . Hence, elongate mounting member  102  extends between the two opposing mounting surfaces  302  and  304 . 
     In the illustrated embodiment, elongate mounting member  102  is made of a single component which has an overall prismatic shape extruded along longitudinal direction X 102 . Thus, mounting element  101  can form a rail, for example a headrail. Alternatively, the elongate mounting member may be made of several parts attached together.  FIG. 11  depicts an exemplary cross-section of elongate mounting member  102 . The exemplary cross-section of elongate mounting member  102  substantially has the form of a rectangle with stiffening webs extending along longitudinal direction X 102 . Throughout the present disclosure, the term “along” means cither “parallel to” or “collinear with”. 
     In the example of  FIGS. 1 to 14 , mounting element  101  forms a headrail. Elongate mounting member  102  may be stiff enough to withstand the weight of the whole architectural covering  200  and the forces resulting from extension mechanism  104  being in the extended state. Elongate mounting member  102  may be composed of extruded aluminum. 
     As depicted in  FIGS. 1 and 4 , mounting element  101  further comprises two flanges  105 . 1  and  105 . 2  which are configured to hold some of the components of architectural covering  200 , like covering member  202 . Flanges  105 . 1  and  105 . 2  are respectively attached to the ends of elongate mounting member  102 . 
     The extension mechanism  104  may be arranged at an end  106  of the elongate mounting member  102 , as shown in  FIGS. 2 to 4 . Extension mechanism  104  may be operable between: i) a retracted state, as shown in  FIGS. 1 and 12 , and ii) an extended state, as shown in  FIGS. 3 and 13 . When the extension mechanism  104  is in the extended state, the mounting element  101  may be fastened to the opposing mounting surfaces  302  and  304 , as shown in  FIG. 13 , so as to mount architectural covering  200  between opposing mounting surfaces  302  and  304 . 
     When the extension mechanism  104  is in the retracted state ( FIG. 12 ), the mounting element  101  is in a release configuration. When the extension mechanism  104  is in the extended state ( FIG. 13 ), the mounting element  101  is in a fastening configuration. 
     As shown in  FIGS. 6, 7 and 8 , the extension mechanism  104  may comprise an actuator  110  and a conversion mechanism  112 . Extension mechanism  104  may further comprise a compression part  114 , as depicted in  FIGS. 5, 6, 12, and 13 . The components of extension mechanism  104  may be composed of metallic and/or of plastic materials. 
     The actuator  110  may protrude from elongate mounting member  102  when the extension mechanism  104  is in the retracted state ( FIGS. 1 and 12 ). The actuator  110  may be rotatable (compare  FIGS. 1 and 3 ) about a rotation axis Y 110  which is perpendicular to the longitudinal direction X 102 . In the example of  FIGS. 12 and 13 , the angle of rotation of the actuator  110  about rotation axis Y 110  is about 40 degrees between the retracted and extended states of the extension mechanism  104 . Rotation axis Y 110  is herein transverse to longitudinal direction X 102  when viewed in a plane parallel to longitudinal direction X 102 . 
     Rotation axis Y 110  may form an angle ranging from 80 degrees to 100 degrees with the longitudinal direction. For example, rotation axis Y 110  is herein orthogonal to longitudinal direction X 102 , such that actuator  110  rotates along a plane which includes longitudinal direction X 102 . The rotation axis may be intersect the longitudinal direction X 102 . Alternatively, the rotation axis may not intersect the longitudinal direction X 102 . 
     As shown in  FIGS. 7, 9, and 12 , actuator  110  comprises a control portion  110 . 1  which is arranged for manually actuating actuator  110 . In order to operate actuator  110  a user can grasp the control portion  110 . 1  and then push the actuator  110  as a lever. 
     The actuator  110  may rotate along an actuator plane which includes the longitudinal direction X 102  and which is vertical when extension mechanism  104  is in the extended state. In the example of  FIGS. 1 to 12 , the rotation axis Y 110  is orthogonal to the longitudinal direction X 102 . The actuator plane corresponds to the plane of  FIG. 12 . 
     The conversion mechanism  112  is configured to convert a rotation of actuator  110  into a translatory movement of rotation axis Y 110  along the longitudinal direction X 102  from the retracted state to the extended state and vice versa. In the example of  FIGS. 1 to 14 , the translatory movement of extension mechanism  104  develops along the longitudinal direction X 102 . The extension mechanism  104  is arranged to abut one of the opposing mounting surfaces  302  and  304  in the extended slate when the mounting element  101  is mounted between the opposing mounting surfaces  302  and  304 . 
     As visible when comparing  FIGS. 12 and 13 , the compression part  114  of the extension mechanism  104  translates towards opposing mounting surface  302  (to the right). In other words, extension mechanism  104  extends in translation (X 102 ) towards opposing mounting surface  302  when the extension mechanism  104  is moved from its retracted state ( FIG. 12 ) to its extended state ( FIG. 13 ). 
     As depicted in  FIGS. 1 and 12 , actuator  110  is displaceable, for example manually, by a force F 110  having a component F 110 Z which is orthogonal to the longitudinal direction X 102 . In the example of  FIG. 12 , force F 110  also has a component F 110 X which is parallel to the longitudinal direction X 12 . 
     Conversion mechanism  112  is configured to convert the displacement of the actuator  110 , actually a rotation about rotation axis Y 110 , due to orthogonal component F 110 Z, into a translatory movement of rotation axis Y 110  towards opposing mounting surface  302  and from the retracted state to the extended state. In its extended state the extension mechanism  104  abuts one of the opposing mounting surfaces  302  and  304  when the mounting element  101  is mounted between the opposing mounting surfaces  302  and  304 . 
     Compression part  114  is configured to transmit a compression force F along the longitudinal direction X 102  towards the opposing mounting surface  302 , as shown in  FIG. 13 . Compression part  114  may substantially have a prismatic shape extending along longitudinal direction X 102 . Alternatively, the compression part may substantially have a cylindrical shape extending along longitudinal direction. 
     When the architectural covering  200  is in its service position, the compression force F may be oriented substantially horizontally and towards the architectural recess  300 , more particularly towards opposing mounting surface  302 . The compression force F makes it possible to hold mounting element  101  in the architectural recess  300  between opposing mounting surfaces  302  and  304 , because compression force F helps generate a friction force, as described further below. 
     The conversion mechanism  112  comprises a biasing part  116  which is mechanically coupled with actuator  110 . Biasing part  116  may be configured to generate the compression force F when the extension mechanism  104  is in the extended state ( FIG. 13 ). In the embodiment of  FIGS. 1 to 14 , biasing part  116  is located on a longitudinal end of mounting element  101 . The actuator  110  may directly actuate biasing part  116 . Thus, extension mechanism  101  can be very compact. Alternatively, the actuator may indirectly actuate tire biasing part, for example where the extension mechanism comprises at least one intermediary component interposed between the actuator and the biasing part. 
     Biasing part  116  may be a component distinct or separate from compression part  114 . Alternatively, the compression part may be integral with the biasing part and, for example, be made one-piece and composed of an elastomeric material. 
     In the illustrated embodiment, compression part  114  comprises an abutment part  115  which is arranged to receive an end of the biasing part  116 . Biasing part  116  may comprise at least one compression spring. In the illustrated embodiment, biasing part  116  comprises two compression springs  116 . 1  and  116 . 2 , which are herein arranged in parallel and laterally spaced apart from each other. Thus, the parallel compression springs  116 . 1  and  116 . 2  make it possible to minimize the overall dimension of mounting element  101  along longitudinal direction X 102 . 
     Each compression spring  116 . 1  or  116 . 2  may be comprised of a helical spring, which can be easily designed and assembled into extension mechanism  101  and which can have a very long service life. Alternatively, the compression spring may be comprised of an elastomeric material. The abutment part  115  has two cylindrical protrusions  115 . 1  and  115 . 2  which are configured to hold respectively the outer ends of springs  116 . 1  and  116 . 2 . 
     According to a not shown aspect, the conversion mechanism may further comprise at least one ring arranged between the actuator and the at least one compression spring. Such a ring may be configured to maximize the interface between the actuator and the at least one compression spring. In service, such a ring can hence distribute the reaction force of the biasing part on the actuator. 
     Biasing part  116  may be elastically deformable and configured to be more stressed when extension mechanism  104  is in the extended state ( FIGS. 3 and 13 ) than in the retracted state ( FIGS. 1 and 12 ) so as to generate the compression force F. The clastic deformation of biasing part  116  results from the length difference of the biasing part  116  between the extended state ( FIG. 13 ) and the retracted state ( FIG. 12 ). The biasing part may be selected to have a deformation distance ranging from 10 mm to 100 mm, for example of 50 mm, the deformation distance being measured as the length difference of the biasing part  116  between the extended state and the retracted state of extension mechanism  104 . 
     Conversion mechanism  112  may further comprise a connection member  120  which is mechanically linked to the elongate mounting member  102  so as to rotate between the retracted state and the extended state, and to the actuator  110  so as to guide actuator  110  in rotation. Connection member  120  is intended to guide in rotation actuator  110  and facilitate its implementation into extension mechanism  104 . 
     On the one hand, connection member  120  may be hinged to the elongate mounting member  102  so as to rotate about a connection axis Y 120  which is orthogonal to the longitudinal direction X 102 , when extension mechanism  104  is displaced between the retracted state ( FIGS. 1 and 12 ) and the extended state ( FIGS. 3 and 13 ). In the example of  FIGS. 12 and 13 , the angle of rotation of the connection member  120  about connection axis Y 120  is about 30 degrees between the retracted and extended states of the extension mechanism  104 . Thus, the connection member can easily be moved between the retracted state and the extended state. Alternatively (not shown), the connection member may be linked to the elongate mounting member so as to move, concomitantly to its rotation, in translation along the longitudinal direction. 
     Mounting element  101  further comprises a hinge  121  which is configured to swingably link connection member  120  to elongate mounting member  102 . Connection member  120  can easily be moved between the retracted state and the extended state. The hinge  121  may be fastened to the elongate mounting member  102 , such that hinge  121  does not translate relative to elongate mounting member  102 . 
     On the other hand, the connection member  120  is linked to actuator  110  so as to guide actuator  110  in rotation, for example about the rotation axis Y 110 . 
     Connection member  120  and actuator  110  may be linked by means of at least: i) a linkage pin and ii)a curvilinear bearing portion arranged to guide the at least one linkage pin. Such linkage pin and curvilinear bearing portion form an inexpensive yet accurate rotatable link between the connection member and the actuator. The curvilinear bearing portion may have the form of a circular arc which extends, for example, over an angle ranging from 45 degrees to 120 degrees. 
     In the example of  FIGS. 1 to 14 , connection member  120  is linked to actuator  110  by means of two linkage pins  122 . 1  and  122 . 2  respectively cooperating with two curvilinear bearing portions  124 . 1  and  124 . 2 . Curvilinear bearing portions  124 . 1  and  124 . 2  are arranged to guide respectively linkage pins  122 . 1  and  122 . 2 . Each linkage pin  122 . 1  or  122 . 2  protrudes on a respective lateral face of connection member  120 . Each curvilinear bearing portion  124  extends on a respective side face of actuator  110 . Each curvilinear bearing portion  124 . 1  or  124 . 2  may have the form of a circular arc which extends over an angle of approximately 60 degrees. Alternatively (not shown), the or each linkage pin may protrude on a side face of the actuator and the curvilinear bearing portion may extend on a lateral face of the connection member. 
     In the example of  FIGS. 1 to 14 , the actuator  110  is configured to be manually movable. The actuator  110  and connection member  120  have substantially elongated shapes. The actuator  110  may herein form a lever and connection member  120  may herein be a rod. In the illustrated embodiment, actuator  110  comprises a control portion  110 . 1  which has a U-shaped cross-section so as to accommodate a substantial portion of connection member  120 . Thus, a user can move the actuator  110  manually In order to operate the extension mechanism  104  between the retracted state ( FIG. 12 ) and the extended state ( FIG. 13 ). As the actuator  110  is rotatable with respect to elongate mounting member  102 , actuator  110  provides a lever arm to operate conversion mechanism  112 . 
     The actuator  110  and connection member  120  are substantially parallel when the extension mechanism  104  is placed in the extended state, as shown in  FIGS. 13 and 14 . Due to their elongated shapes and to their substantially parallel arrangement, actuator  110  and connection member  120  keep extension mechanism  104  very compact when viewed in a plane perpendicular to the longitudinal direction X 102 . 
     In the example of  FIGS. 1 to 14 , elongate mounting member  102  comprises a housing part  126  which fully accommodates the extension mechanism  104  in its extended state ( FIGS. 3 and 13 ). Housing part  126  thus protects the actuator  110  and the connection member  120  and mounting element  101  is compact when extension mechanism  104  is in its extended state, as no component protrudes from elongate mounting member  102 . 
     As best shown in  FIGS. 5 and 7 , the actuator  110  and the connection member  120  have respective outer side walls and respective inner stiffening webs with hollow regions therebetween. Such a design makes it possible to maximize the ratio of the mechanical strength over the weight respectively for the actuator  110  and for the connection member  120 . 
     As shown in  FIG. 10 , housing part  126  has an opening  127  which is configured for the passage of part of the actuator  110  and part of the connection member  120  When the extension mechanism is in the extended state ( FIGS. 3 and 13 ) a user can access the actuator  110  through opening  127 . When extension mechanism  104  is in the retracted state ( FIGS. 1 and 12 ), actuator  110  may protrude from the elongate mounting member  102  through opening  127  Thus, a user can easily reach for actuator  110  and push it as a lever in order to place extension mechanism  104  in its extended state. 
     The actuator  110  may be at least partly arranged between the connection member  120  and the biasing part  116 . The actuator  110  may be interposed between connection member  120  and biasing part  116 . 
     In the illustrated embodiment, actuator  110  has a pushing portion  110 . 2  which is arranged to push conversion mechanism  112 , herein compression part  114 . via biasing part  116 . Put another way, pushing portion  110 . 2  indirectly pushes conversion mechanism  112 , herein compression part  114 . Pushing portion  110 . 2  may be moveable in translation along longitudinal direction X 102  and in rotation, herein about rotation axis Y 110 , hence orthogonally to longitudinal direction X 102 . The translatory movement of rotation axis Y 110  is transmitted by pushing portion  110 . 2 . 
     Relative to the actuator  110 , pushing portion  110 . 2  is distant from control portion  110 . 1 . Pushing portion  110 . 2  may be located on one end of actuator  110  whereas control portion  110 . 1  may be located on the opposite end of actuator  110  or else in a median region of the actuator  110 . 
     In the illustrated embodiment, the conversion mechanism  112  comprises a guide  130  which is configured to guide actuator  110  both in translation and in rotation, as hereinafter described. 
     The guide may have at least one guiding slot which extends at least partly along the longitudinal direction. The actuator may further comprise at least one pin configured to slidingly and rotatably move in the at least one guiding slot. Such pin and guiding slot enable translation and rotation of the actuator. 
     As shown in  FIG. 8 or 9 , guide  130  has two guiding slots  130 . 1  and  130 . 2  which are arranged on two sides of guide  130 . Both guiding slots  130 . 1  and  130 . 2  extend parallel to longitudinal direction X 102 . As a complementary arrangement, as shown in  FIGS. 6, 7 and 9 , actuator  110  may further comprise two pins  132 . 1  and  132 . 2  which are configured to slidingly and rotatably move respectively in guiding slots  130 . 1  and  130 . 2 . Thus, pins  1321  and  132 . 2  and guiding slots  130 . 1  and  130 . 2  enable the actuator  110  to translate parallel to longitudinal direction X 102  and to rotate herein about rotation axis Y 110 . 
     The guide  130  herein has two grooves  130 . 3  and  130 . 4  which are respectively configured for the introduction of pins  132 . 1  and  132 . 2  up into the guiding slots  130 . 1  and  130 . 2  when an operator assembles the extension mechanism  104 . 
     Besides, guide  130  also guides and holds compression part  114  along longitudinal direction X 102 . Guide  130  is configured to substantially accommodate compression part  114 . 
     In the illustrated embodiment, mounting element  101  further comprises a friction member  134  which is arranged on an outer end portion  104 . 1  of the extension mechanism  104  so as to bear against the architectural recess  300 , in this case against opposing mounting surface  302 , when extension mechanism  104  is in the extended state ( FIGS. 3 and 13 ). 
     Friction member  134  may be mechanically linked to conversion mechanism  112 , herein to compression part  114 , such that friction member  134  converts a part of the translatory displacement of rotation axis Y 110  along the longitudinal direction X 102  into an upwardly-oriented friction force F 134 , as shown in  FIG. 13 , when friction member  134  abuts opposing mounting surface  302 . Thus, friction member  134  makes it possible to fasten mounting element  101  in architectural recess  300 , hence to mount architectural covering  200  between opposing mounting surfaces  302  and  304 , because of the upwardly-oriented friction force F 134 . Upwardly-oriented friction force F 134  results from the friction coefficient. The friction member  134  may belong to compression part  114 . 
     In the illustrated embodiment, friction member  134  is arranged to protrude, on a small scale, from the outer end portion  104 . 1  of the extension mechanism  104  when extension mechanism  104  is placed in the extended state. Depending on the play between architectural recess  300  and mounting element  101 . friction member  134  may protrude only on a small scale from outer end portion  104 . 1 . In the illustrated embodiment, friction member  134  is integral with compression part  114 . The friction member and the compression part may be made as a single piece. 
     Alternatively, the friction member may be a component separate from the compression part. The friction member may be secured to the compression part directly or indirectly, i.e. without or with at least one element interposed between the friction member and the compression part. 
     In the illustrated embodiment, friction member  134  is composed of at least one friction material selected within the group consisting of elastomeric materials and plastics. Alternatively, the friction member may be composed of another material provided the friction member has a surface roughness selected to convert the translatory movement into the upwardly-oriented friction force. The friction member may be elastic or resilient due to its material and/or due to its shape. 
     At the end (left end) of elongate mounting member  102  opposite the extension mechanism  104 , the mounting element  101  may further comprise a supplementary friction member. The supplementary friction member may be substantially similar to friction member  134  The supplementary friction member may be arranged so as to bear against architectural recess  300 , in this case against opposing mounting surface  304 . 
     The supplementary friction member may also be configured to convert a part of the translatory movement of rotation axis Y 110  into an upwardly-oriented friction force when the supplementary friction member bears against opposing mounting surfaces  302  and  304 . This left-hand part of translatory movement of rotation axis Y 110  Imparts a portion of the compression force F to the supplementary friction member via the stiff portions of elongate mounting member  102 . Mounting element  101  may further comprise a supplementary holder which is configured to hold the supplementary friction member. The supplementary friction member is arranged to protrude from the supplementary holder. The mounting element may further comprise a supplementary extension mechanism which is similar or identical to extension mechanism  104  and which is arranged at the other end of the elongate mounting member opposite the end at which is arranged extension mechanism  104 , as shown in  FIGS. 17 to 27 . 
     Alternatively or complementarily to the presence of a friction member, a friction pad may already be secured to the architectural recess, for example by means of double-sided tape or glue. 
     As shown in  FIG. 14 , in order to prevent the extension mechanism  104  from unwittingly returning into the retracted state, extension mechanism  104  is arranged in the extended state ( FIG. 14 ) such that actuator  110  is locked against its rotation from the extended state to the retracted state. 
     In the example of  FIG. 14 , actuator  110 , biasing part  116 , and connection member  120  may be arranged so that the biasing part  116  exerts a locking torque T 116  on actuator  110  about connection axis Y 120 . Locking torque T 116  is oriented counter a rotation direction R 110  of actuator  110  from the extended state to the retracted state. Thus, locking torque T 116  prevents an unexpected self-retraction of the extension mechanism  104 . In other words, locking torque T 116  can prevent the extension mechanism  104  from unwittingly returning into the retracted state once it has been placed by the user in the extended state. 
     In order to generate locking torque T 116 , actuator  110 , biasing part  116  and connection member  120  may be arranged such that:
         the mechanical link  110 . 120  between actuator  110  and connection member  120  is located on the other side,   with respect to the mechanical link  110 . 120  between actuator  110  and connection member  120  when extension mechanism  104  is in the extended state ( FIG. 14 ),   of a segment connecting: a) the center of rotation C 121  of connection member  120  relative to elongate mounting member  102 , to b) the point  110 . 116  of actuator  110  where is exerted the resultant of the reaction force F 116  generated by biasing part  116 .       

     When the mounting element  101  is in service, the extension mechanism  104  is first in its retracted state. A user can, with one hand, hold the mounting element  101  at its mounting position between opposing mounting surfaces  302  and  304 . With its other hand, the user can grasp actuator  110 , push it as a lever to impart the force F 110  to actuator  110  and rotate it herein about rotation axis Y 110 . 
     The connection member  120  is driven in rotation about connection direction Y 120  by actuator  110  via linkage pins  122 . 1  and  122 . 2  guided by the curvilinear bearing portions  124 . 1  and  124 . 2 . 
     Pushing portion  110 . 2  of actuator  110  may rotate about rotation axis Y 110  and may slide along longitudinal direction X 102  towards opposing mounting surface  302 . While sliding, actuator  110  compresses biasing pail  116 . Biasing part  116  in turn drives compression part  114  in translation along longitudinal direction X 102  towards opposing mounting surface  302 . 
     Once friction member  134  has covered a gap C, between extension mechanism  104  and opposing mounting surface  302 , friction member  34  bears against the architectural recess  300 . Then, compression part  114  starts to transmit a compression force F to opposing mounting surface  302 . Hence, friction member  134  starts to convert a part of the translatory movement into the upwardly-oriented friction force F 134 . 
     When extension mechanism  104  reaches its extended state, biasing pan  116  fully generates compression force F. The length difference of biasing part  116  as compared to the retracted state is depicted in  FIGS. 12 and 13  with reference sign LD 116 . Friction member  134  fully produces the upwardly-oriented friction force F 134 , which enables the mounting element  101  to hold in place the architectural covering  200 . The supplementary friction member likewise produces an upwardly-oriented friction force. Thus, the mounting element  101  is force-fitted between opposing mounting surfaces  302  and  304 . 
     Since actuator  110  is locked, as afore-detailed, against its rotation direction R 110  from the extended state to the retracted state, the extension mechanism  104  steadily remains in the extended state. The architectural covering  200  thereby remains in its service position. 
     As a summary, the user only needs to grasp actuator  110 , push it as a lever and rotate it in order to impart force F 110  to actuator  110  so as to place extension mechanism  104  in the extended state. With one hand a user can hold mounting element  101  at its mounting position and, with its other hand, the user can grasp actuator  110 , push it as a lever and rotate it in order to operate, hence impart the force F 110  to, the actuator  110  so as to fasten mounting element  101  to architectural recess  300 . 
     Thus, actuator  110  enables a user to easily fasten mounting element  101  between opposing mounting surfaces  302  and  304 , herein in architectural recess  300  Such architectural covering  200  can hence be quickly and reliably installed by hand, hence without tool. Once fastened, mounting element  101  achieves a force fit (frictional fit) between opposing mounting surfaces  302  and  304 . Mounting element  101  may alternatively or complementarily achieve a form fit, for example if one or both of opposing mounting surfaces  302  and  304  has matching female or male reliefs (not shown). 
     Vice versa, in case the user wants to detach or unfasten the architectural covering  200  from the architectural recess  300 , the user can access the actuator  110  Through opening  127 . Then the user draws the actuator  110  as a lever so as to rotate it along rotation direction R 110 . The connection member  120  rotates as well and guides the actuator from the extended state to the retracted state. Thus, such an architectural covering can be quickly and reliably installed by hand, hence without tool between opposing mounting surfaces. 
     While the actuator  110  rotates, biasing part  116  relaxes and eventually stops generating the compression force F and conversion mechanism  112  stops providing the translatory movement to rotation axis Y 110 . Friction member  134  and the supplementary friction member stop producing upwardly-oriented friction forces 
     By the time the extension mechanism  104  reaches its retracted state, the mounting element  1  no longer holds the architectural covering  200 , which the user can then hold by one hand and remove from the architectural recess  300 . 
     Thus, the actuator enables a user to easily fasten or unfasten the mounting element between opposing mounting surfaces. Indeed, the user only needs to impart the force to the actuator so as to place the extension mechanism in the extended state. With one hand a user can hold the mounting element at its mounting position and, with its other hand, the user can push the lever-like actuator to impart the force driving the conversion mechanism, so as to fasten the mounting element to the architectural recess. 
       FIG. 15  illustrates a second embodiment of a mounting element  101 . Inasmuch as the mounting element  101  of  FIG. 15  is similar to the mounting clement  101  of  FIGS. 1 to 14 , the afore-detailed description may be applied to the mounting element  101  of  FIG. 15 , but for the hereinafter mentioned noticeable differences. An element of mounting element  101  of  FIG. 15  having a structure or function that is substantially similar to an element of the mounting element  101  of  FIGS. 1 to 14  is given the same reference sign or number. Even though two or more figures illustrating different embodiments may have such elements that are structurally and/or functionally similar, the presence of a same reference sign or number in otherwise different embodiments should not be understood as limiting the disclosure to the specific element nor the scope of protection of the claimed subject-matter. 
     Like the mounting element  101  of  FIGS. 1 to 14 , the mounting element  101  of  FIG. 15  comprises an extension mechanism  104 , an actuator  110 , a conversion mechanism  112 , a compression part  114 , a biasing part  116 , a connection member  120 , a guide  130 , and a friction member  134  and a supplementary friction member. 
     The mounting element  1  of  FIG. 15  mainly differs from the mounting element  101  of  FIGS. 1 to 14  in that the compression part  114  and the biasing part  116  are reversedly arranged with respect to  FIGS. 1 to 14 . The mounting clement  101  of  FIG. 15  also differs from the mounting element  101  of  FIGS. 1 to 14  in that the actuator  110  and the connection member  120  are reversedly arranged with respect to  FIGS. 1 to 14 . 
     In service, actuator  110  directly pushes compression part  114  in translation towards opposing mounting surface  302 , whereas compression part  114  pushes biasing part  116  in translation. Biasing part  116  imparts a compression force to friction member  134  and to the supplementary friction member, which in turn produce upwardly-oriented forces to hold mounting element  101 . 
       FIG. 16  illustrates a third embodiment of a mounting element  101  Inasmuch as the mounting element  101  of  FIG. 16  is similar to the mounting element  101  of  FIGS. 1 to 14 . the afore-detailed description may be applied to the mounting element  101  of  FIG. 16 , but for the hereinafter mentioned noticeable differences. An clement of mounting element  101  of  FIG. 16  having a structure or function identical to an element of the mounting element  101  of  FIGS. 1 to 14  is given the same reference sign. 
     Like the mounting element  101  of  FIGS. 1 to 14 , the mounting element  101  of  FIG. 16  may comprise an extension mechanism  104 , an actuator  110 , a conversion mechanism  112 , a compression part  114 , a biasing part  116 , a connection member  120 , a guide  130 , and a friction member  134  and a supplementary friction member. 
     The mounting element  1  of  FIG. 16  mainly differs from the mounting element  101  of  FIGS. 1 to 14  in that the biasing part  116  is arranged between actuator  110  and connection member  120 . 
       FIGS. 17 to 27  illustrate an independent object having a supplementary extension mechanism  154  which belongs to mounting element  101  and which is arranged a: the opposite end of the elongate mounting member  102  with respect to the above described extension mechanism  104 . Thus, the supplementary extension mechanism  154  is located near the flange  105 . 2 . The elongate mounting member  102  thus extends from extension mechanism  104  to supplementary extension mechanism  154   
     In the illustrated embodiment, the supplementary extension mechanism  154  has several functional features similar to the extension mechanism  104 . A component of supplementary extension mechanism  154  having a similar function as n component of extension mechanism  104  is hereinafter designated with the same reference sign augmented by  50 . Supplementary extension mechanism  154  is operable between; i) a retracted state, as depicted on  FIGS. 17, 19 and 25 , and ii) an extended state, as depicted on  FIGS. 18, 20 and 27 .  FIG. 26  depicts the supplementary extension mechanism  154  placed in an intermediary state between the retracted state and an extended state. 
     Depending on the distance between the opposing mounting surfaces  304  and  302 , the mounting element  101  may be i) in a fastening configuration when supplementary extension mechanism  154  is in an extended state and ii) in a release configuration when supplementary extension mechanism  154  is in the retracted state. 
     The supplementary extension mechanism  154  may comprise a supplementary actuator  160 , a supplementary conversion mechanism  162  and a supplementary compression part  164 . Supplementary extension mechanism  154  may further comprise a supplementary sliding portion  163  which is arranged to translate along longitudinal direction X 102  with respect to elongate mounting member  102 . In the illustrated embodiment, sliding portion  163  is arranged to translate within the elongate mounting member  102 . The components of supplementary extension mechanism  154  may be composed of metallic and/or of plastic materials. 
     The supplementary actuator  160  may be rotatable about a supplementary rotation axis Y 160 , which is substantially perpendicular to the longitudinal direction X 102 . The supplementary rotation axis Y 160  may form an angle ranging from 80 t0 100 degrees, e.g. 90 degrees, with the longitudinal direction X 102 . The supplementary rotation axis Y 160  may be vertical when the mounting element is in a service position. 
     The supplementary conversion mechanism  162  may be configured to convert a rotation of supplementary actuator  160  into a translatory movement of supplementary rotation axis Y 160  along the longitudinal direction X 102  from the retracted state to an extended state and vice versa. In the example of  FIGS. 17 to 32 , the translatory movement of supplementary extension mechanism  154  develops along the longitudinal direction X 102 . 
     The supplementary extension mechanism  154  may be arranged so that supplementary compression part  164  may abut opposing mounting surface  304  and thus transmit a compression force to opposing mounting surface  304 . In case the distance between the opposing mounting surfaces  304  and  302  is relatively short, the supplementary compression part  164  may abut opposing mounting surface  304  when the supplementary extension mechanism  154  is in its retracted state. In such a case, placing the extension mechanism  104  in its extended state suffices to make both the compression part  104  and the supplementary compression part  164  abut respectively on the opposing mounting surfaces  302  and  304 . 
     As visible when comparing  FIGS. 17 and 18  or  FIGS. 25 and 27 , the supplementary compression part  164  of supplementary extension mechanism  154  translates towards opposing mounting surface  304  (to the left). In other words, supplementary extension mechanism  154  extends in translation (X 102 ) towards opposing mounting surface  304  when supplementary extension mechanism  154  is moved from its retracted state ( FIGS. 17 and 25 ) to an extended state ( FIGS. 18 and 27 ). 
     Supplementary compression part  164  may be configured to transmit a supplementary compression force along the longitudinal direction X 102  towards opposing mounting surface  304 . Supplementary compression part  164  substantially may have a prismatic shape extending along longitudinal direction X 102 . Supplementary compression part  164  may comprise an abutment part  165 , as shown in  FIG. 22 . 
     When the architectural covering  200  is in its service position, the supplementary compression force may be oriented substantially horizontally and towards opposing mounting surface  304 . The supplementary compression force helps hold the mounting element  101  in the architectural recess  300  between opposing mounting surfaces  302  and  304 , because it helps generate a friction force, akin to the afore-described force generated by compression part  104 . 
     Supplementary conversion mechanism  162  may comprise a driven portion  163 . 1  which is fast in translation with supplementary sliding portion  163 . Furthermore, supplementary conversion mechanism  162  may comprise four driving surfaces  160 . 1 ,  160 . 2 ,  160 . 3  and  160 . 4  which are configured to cooperate selectively with driven portion  163 . 1 . The driving surfaces  160 . 1 ,  160 . 2 ,  160 . 3  and  160 . 4  are fast in rotation with supplementary actuator  160 . Within the supplementary conversion mechanism  162 , driven portion  163 . 1  is configured to cooperate with a selected one of the driving surfaces  160 . 1 ,  160 . 2 ,  160 . 3  and  160 . 4 . 
     As illustrated on  FIGS. 25 to 27 , the driven portion  163 . 1  has a semi-cylindrical male cross-section, the shape of which is substantially complementary to each driving surface  160 . 1 ,  160 . 2 ,  160 . 3  or  160 . 4 . Thus, driving surface  160 . 1 ,  160 . 2 ,  160 . 3  or  160 . 4  may selectively drive driven portion  163 . 1  in translation along longitudinal direction X 102 . The driving surfaces  160 . 1 ,  160 . 2 ,  160 . 3  and  160 . 4  may be arranged such that each driving surface  160 . 1 ,  160 . 2 ,  160 . 3  or  160 . 4  extends substantially perpendicularly to its adjacent driving surfaces. For example, driving surface  160 . 1  may be arranged such that it extends substantially perpendicularly to its adjacent driving surfaces  160 . 2  and  160 . 4 . 
     The supplementary actuator  160  may have an actuating portion  161  In the example of  FIG. 24 , the actuating portion  161  has a slot  161 . 1  configured to receive a tool, for example a screwdriver. When a tool is inserted in slot  161 . 1 , a user may exert a torque on the tool to impart rotation to the supplementary actuator  160  about the supplementary rotation axis Y 160 , selectively clockwise or counterclockwise. As shown on  FIGS. 19 and 20 , elongate mounting member  102  may have an opening  102 . 160 , e.g. a hole., configured to make the slot  161 . 1  accessible to a tool from outside, say from under, the elongate mounting member  102 . 
     The supplementary actuator  160  may be configured such that the slot  161 . 1  has a geometric, center C 161 . 1  substantially located on the rotation axis Y 160 . As illustrated by double arrows on  FIG. 24 . the driving surfaces  160 . 1 ,  160 . 2 ,  160 . 3  and  160 . 4  are located at different respective distances from geometric center C 161 . 1 . When ranked by increasing distance, driving surface  160 . 1  is located closest to geometric center C 161 . 1 ; driving surface  160 . 2  is located closer to geometric center C 161 . 1  than driving surface  160 . 3 ; finally, driving surface  160 . 4  is the furthest from geometric center C 161 . 1 . Each of the afore mentioned distances is measured as a Euclidean distance, i.e. as the shortest distance between geometric center C 161 . 1  and the closest point of the relevant driving surface. 
     As a result, when driven portion  163 . 1  bears against driving surface  160 . 1 , as shown in  FIG. 25 , the outer end of the supplementary compression part  164  is further from the opposing mounting surface  304  than when driven portion  163 . 1  bears against driving surface  160 . 2 , as shown in  FIG. 26 , and even further than when driven portion  163 . 1  bears against driving surface  160 . 3 , as shown in  FIG. 27 . 
     Besides, supplementary actuator  160  may comprise a ratchet wheel  167  having several notches  167 . 1  on its periphery. Complementarily, supplementary conversion mechanism  162  may comprise at least one pawl, herein two pawls  168 , configured to fall within the notches  167 . 1 . Pawls  168  may be arranged symmetrically with respect to longitudinal direction X 102  when the mounting element  101  is in the assembled state. Ratchet wheel  167  and pawls  168  may be configured to cooperate such that each pawl  168  may fall into a respective notch  167 . 1  of the ratchet wheel  167 . When located into respective notches  167 . 1 , pawls  168  prevent rotation of supplementary actuator  160 . In the examples of  FIGS. 21 to 24 , ratchet wheel  167  and pawls  168  are configured so as to define four discrete, stable positions of the supplementary actuator  160  about supplementary rotation axis Y 160 . These four discrete, stable positions correspond to the four driving surfaces  160 . 1 ,  160 . 2 ,  160 . 3  and  160 . 4 . 
     In service, a user may insert a tool, e.g. a screwdriver, in slot  161 . 1  in order to impart a rotation to supplementary actuator  160  about supplementary rotation axis Y 160 . Such rotation of supplementary actuator  160  is converted by supplementary conversion mechanism  162  into a translatory movement of supplementary sliding portion  163 , via the cooperation of driven portion  163 . 1  with the selected driving surfaces  160 . 1 ,  160 . 2 ,  160 . 3  and  160 . 4 . Where supplementary compression part  164  does not abut opposing mounting surface  304 , the pawls  168  may release ratchet wheel  167 , such that supplementary actuator  160  may rotate about the supplementary rotation axis Y 160  from 90, 180 or 270 degrees, depending on the angle selected by the user to set the appropriate overall length of the mounting element  101 , i.e. depending on the driving surface  160 . 1 ,  160 . 2 ,  160 . 3  or  160 . 4  selected by the user to press against driven portion  163 . 1 . 
     The afore-mentioned four discrete, stable positions of the supplementary actuator  160  each correspond to a given protruding distance by which the supplementary compression part  164  protrudes towards opposing mounting surface  304 . For example, an increment in the protruding distance may be 1.5 mm between two successive stable positions, i.e. between two successive driving surfaces  160 . 1 ,  160 . 2 ,  160 . 3  and  160 . 4 . After the user has set the appropriate overall length, the mounting element  101  can fit in the architectural recess  300  with both the extension mechanism  104  and the supplementary extension mechanism  154  abutting respectively on the opposing surfaces  302  and  304 . 
       FIGS. 28 to 32  illustrate another independent object comprising a battery assembly  401  intended to supply power to a not shown electric motor, in order to wind and unwind the covering member  202 . The electric motor may be housed within a roller supporting covering member  202 . 
     The battery assembly  401  may comprise a rechargeable battery pack  402 , an output connector  404  and a charger plug  406 . The rechargeable battery pack  402  may be comprised of several batteries which may be arranged in a series, parallel or a mixture thereof, depending on the required power characteristics. 
     The rechargeable battery pack  402  may be configured to be completely accommodated in the elongate mounting member  102  which may herein form a headrail as afore-mentioned. Elongate mounting member  102  may have a housing space configured to accommodate at least partially rechargeable battery pack  402 . 
     Rechargeable battery pack  402  may be secured to elongate mounting member  102  so as to prevent the user from removing rechargeable battery pack  402  out of elongate mounting member  102 . For example, battery assembly  401  may comprise securing elements configured to secure rechargeable battery pack  402  to the elongate mounting member  102  in a non-detachable manner. 
     The output connector  404  may be a standard DC connector configured to get connected to the electric motor. When supplied with power from the rechargeable battery pack  402 , the electric motor may wind or unwind the covering member  202  upon receipt of a dedicated command signal. In the example of  FIGS. 28 to 32 , output connector  404  is located outside the elongate mounting member  102  so as to be easily connected to the electric motor. A cable may connect the output connector  404  to the rechargeable battery pack  402 . 
     The charger plug  406  may be a standard plug configured to connect rechargeable battery pack  402  to a recharging power source. Charger plug  406  and elongate mounting member  102  may be configured so that charger plug  406  is accessible from outside the elongate mounting member  102 . For example, elongate mounting member  102  may comprise a hole  102 . 406  for accessing charger plug  406  and thus plug rechargeable battery pack  402  to a not shown charger or recharging power source. 
     In service, when the rechargeable battery pack  402  needs to be recharged, the user may: i) either plug in a charger while the mounting element  101  remains mounted in architectural recess  300 , ii) or remove from architectural recess  300  the whole mounting element  101  and displace it to get rechargeable battery pack  402  recharged at a dedicated charging installation. 
       FIG. 32  illustrate yet another independent object. Elongate mounting member  102  may herein comprise mounting clips  103 . 1 ,  103 . 2 ,  103 . 3  arranged to help mount, for example, a horizontal blind or a roman blind onto the mounting element  101  so as to install the architectural covering  200 . 
       FIGS. 33 to 36  illustrate a fourth embodiment of a mounting element lot. Inasmuch as the mounting element  101  of  FIGS. 33 to 36  is similar to the mounting clement  101  of  FIGS. 1 to 14 , the afore-detailed description may be applied to the mounting element  101  of  FIGS. 33 to 36 , but for the hereinafter mentioned noticeable differences. An element of mounting element  101  of  FIGS. 33 to 36  having a structure or function that is substantially similar to an element of the mounting element  101  of  FIGS. 1 to 14  is given the same reference sign or number. Even though two or more figures illustrating different embodiments may have such elements that are structurally and/or functionally similar, the presence of a same reference sign or number in otherwise different embodiments should not be understood as limiting the disclosure to the specific element nor the scope of protection of the claimed subject-matter. 
     Like the mounting element  101  of  FIGS. 1 to 14 , the mounting clement  101  of  FIGS. 33 to 36  comprises an extension mechanism  104 , an actuator  110 , a conversion mechanism  112 , a compression part  114 , a biasing part  116 , a connection member  120 , a hinge  121 , and a guide  130 . Further, the mounting element  101  of  FIGS. 33 to 36  comprises a flange  105 . 1 . 
     The mounting element  1  of  FIGS. 33 to 36  differs from the mounting element  101  of  FIGS. 1 to 14  in that compression part  114  may be configured so as to transmit, towards an opposing mounting surface  302 , a compression force F that is applied below the longitudinal centerline of the elongate mounting member  102 , when the extension mechanism  104  reaches its extended state ( FIGS. 34 and 36 ). The longitudinal centerline of the elongate mounting member  102  may herein be represented by the longitudinal direction X 102 . In the plane of  FIG. 34  an offset distance D separates the application direction of the compression force F from the centerline of the elongate mounting member  102 . The longitudinal centerline of the elongate mourning member  102  may be defined as the longitudinal neutral axis, with respect to the moments of inertia, of the elongate mounting member  102 , or as the line that extends parallel to the longitudinal direction X 102  and that passes through the center of gravity of the elongate mounting member  102 . 
     Hence, the mounting element  101  comprises the elongate mounting member  102 , which is elongated along a longitudinal direction X 102 , and an extension mechanism  104 , which is arranged at an end of the elongate mounting member  102 . The extension mechanism  104  is operable between: i) a retracted state ( FIGS. 33 and 35 ) and ii) an extended state ( FIGS. 34 and 36 ). The extension mechanism  104  comprises the compression part  114  that protrudes in the longitudinal direction X 102 . The compression part may be configured so as to transmit, towards an opposing mounting surface  302 , a compression force F that is applied below the longitudinal centerline of the elongate mounting member  102 , when the extension mechanism  104  reaches its extended state ( FIGS. 34 and 36 ). 
     Further, the extension mechanism  104  includes a conversion mechanism  112  which is equipped with the compression part  114 , the compression part  114  being configured to transmit a compression force F along the longitudinal direction X 102  towards the opposing mounting surface  302 . 
     Likewise, at the opposite end of the elongate mounting member  102 , a not shown supplementary compression part may be configured to transmit, in an extended state, a supplementary compression force that is applied below the longitudinal centerline of the elongate mounting member  102 . Such a supplementary compression part may be substantially similar to the supplementary compression part  164  of  FIG. 27 . 
     The reactions of the opposing mounting surface  302  to compression force F that is applied below the centerline of elongate mounting member  102  and, as the case may be, to a corresponding supplementary compression force may thus induce a moment M as symbolized by on  FIG. 34 . The moment M may be represented as producing its effect i) on the center of gravity of the elongate mounting member  102  and ii) around an axis perpendicular to the plane of  FIG. 34 . 
     When the mounting element  101  of  FIGS. 33 to 36  is in service in the extended state of the extension mechanism  104 , actuator  110  directly pushes compression part  114  towards opposing mounting surface  302 , whereas compression part  114  pushes biasing part  116  in translation. Biasing part  116  imparts a compression force to friction member  134  and to the supplementary friction member, which in turn produce upwardly-oriented forces to hold mounting element  101 , as described for example in relation to  FIG. 13 . 
     As a result, the moment M causes a slight bending upwards of the elongate mounting member  102 , which tends to deflect the central region. Thus, the moment M enhances the resistance to the gravity forces that apply on the mounting element  101 . such that the elongate mounting member  102  may be kept rectilinear along the longitudinal direction X 102 . In other words, the moment M contributes to avoiding that the elongate mounting member  102  bends downwards over time after the installation of the mounting element  101  in an architectural recess. 
     Besides, compression part  114  may have two protrusions  115 . 1  and  115 . 2 , which may be configured to transmit two respective components of the compression force F to the opposing mounting surface  302 . The protrusions  115 . 1  and  115 . 2  may be located on the lateral sides of compression part  114  in a direction perpendicular to the longitudinal direction X 102 . In the example of  FIG. 33 , each protrusion  115 . 1  or  115 . 2  extends obliquely downwards with respect to the outer planar face of compression part  114 , as also visible at  FIG. 38 , thus defining an oblique angle A 115  which is herein approximately. The protrusions  115 . 1  and  115 . 2  may enhance the lateral stabilization of the mounting element  101  in service. Compression part  114  maybe made of a metallic material, for example of a steel or aluminum. 
     In a not shown variant, the compression part may have only one protrusion, which may be configured to be located under the centerline of the elongate mounting member. Such a protrusion may for example also extend obliquely downwards with respect to the outer face of the compression part. 
     The mounting element  1  of  FIGS. 33 to 36  further differs from the mounting element  101  of  FIGS. 1 to 14  in that it may comprise a damping elastic member  117  which is configured to dampen the kinetic energy of the guided part of actuator  110  when the extension mechanism  104  is returned to the retracted state. Thus, damping elastic member  117  may prevent the actuator  110  from bumping against the abutment part of guide  130 , and thereby may have an effect on the service life of guide  130 . 
     In the example of  FIGS. 33 to 36  the damping elastic member  117  includes two damping springs which are arranged on both sides of the actuator  110 . Each damping spring of damping elastic member  117  may be formed by a compression helical spring that works parallel to the longitudinal direction X 102 . Each damping spring of damping elastic member  117  may extend between the abutment part of guide  130  and a respective pin  132 . 1 ,  132 . 2  that is movable in a respective guiding slot  130 . 1 ,  130 . 2 , as described in relation to  FIGS. 1 to 14 . 
     In a not shown alternative variant, the damping elastic member may include only one damping spring, which may be arranged at the centerline of the elongate mounting member and which may be formed by a compression helical spring that works parallel to the longitudinal direction. Such a damping spring may also extend between an abutment part of the guide and a pin that is movable in a guiding slot. 
     The damping elastic member  117  is less compressed when the extension mechanism  104  is in its extended state ( FIGS. 34 and 36 ) than when the extension mechanism  104  is in its retracted state ( FIGS. 33 and 35 ). In the embodiment of  FIGS. 33 to 36  the damping clastic member  117  may be i) completely unloaded when the extension mechanism  104  is in its extended state, and ii) elastically deformed, hence compressed, when the extension mechanism  104  is in its retracted state. 
     To facilitate the mounting of the extension mechanism  104  and the accurate, reliable positioning of the damping springs of damping elastic member  117 , the guide  130  may comprise positioning pins  118  that respectively extend at least partially into the damping springs so as to center the same. 
     Besides, as represented on  FIG. 36 , the assembly of guide  130  onto the end of elongate mounting member  102  may offer an angular play AP, which may compensate a possible misalignment of the not shown architectural recess. 
       FIGS. 37 and 38  illustrate a fifth embodiment of a mounting element  101 . Inasmuch as the mounting element  101  of  FIGS. 37 and 38  is similar to the mounting element  101  of  FIGS. 33 to 36 , the afore-detailed description may be applied to the mounting element  101  of  FIGS. 37 and 38 , but for the hereinafter mentioned noticeable differences. An element of mounting element  101  of  FIGS. 37 and 38  having a structure or function that is substantially similar to an element of the mounting clement  101  of  FIGS. 33 to 36  is given the same reference sign or number. Even though two or more figures illustrating different embodiments may have such elements that are structurally and/or functionally similar, the presence of a same reference sign or number in otherwise different embodiments should not be understood as limiting the disclosure to the specific element nor the scope of protection of the claimed subject-matter. 
     The mounting element of  FIGS. 37 and 38  differs from the mounting element  101  of  FIGS. 33 to 36  in that flange  105 . 1  may be integral with compression part  114 . In service the flange  105 . 1  may support for example a roller blind below the elongate mounting member  102 . In the example of  FIGS. 37 and 38 , flange  105 . 1  may be one-piece with compression part  114 , whereas flange  105 . 1  is secured to the elongate mounting member  102  in the embodiments of  FIGS. 1 to 14 and 33 to 36 . 
     In a not shown alternative embodiment, the flange may be secured to the compression part  114  by any suitable means, for example rivets or welds. In a further not shown alternative embodiment the flange made integral with the compression part may have the shape of an open square box, so as to hold a venetian blind. Alternatively, the flange may be configured to support a pleated blind, a honeycomb blind, roman shades etc. 
     The flange  105 . 1  of  FIGS. 37 and 38  fulfils a substantially similar function as flange  105 . 1  of  FIGS. 1 to 14 and 33 to 36 , as it is configured to hold a covering member together with a supplementary flange located at the opposite end of the mounting element. Such an integral flange  105 . 1  of  FIGS. 37 and 38  defines a compact assembly for the extension mechanism  104 . 
     The mounting element of  FIGS. 37 and 38  further differs from the mounting element  101  of  FIGS. 33 to 30  in that it comprises a friction member  134 . which fulfils a substantially similar function as the friction member  134  of  FIGS. 1 to 14 . Friction member  134  may be made of an elastomeric material. A set of friction members of different sizes may be delivered along with the mounting element to facilitate the user in finding a suitable friction member. 
     Friction member  134  of  FIGS. 37 and 38  is thinner, along longitudinal direction X 102 , than friction member  134  of  FIGS. 1 to 14 . Thus, the longitudinal deformation of friction member  134  of  FIGS. 37 and 38  is smaller than the longitudinal deformation of friction member  134  of  FIGS. 1 to 14 . 
     Besides, friction member  134  of  FIGS. 37 and 38  has an upper region  134 . 1  that is thinner than the bottom region. Such a thinner upper region  134 . 1  ensures that the contact region with the opposing mounting surface  302  will remain below the centerline of elongate mounting member  102 . 
     Like compression part  114  of  FIGS. 33 to 36 , compression part  114  of  FIGS. 37 and 38  may comprise two protrusions  115 . 1  and  115 . 2 . In the example of  FIG. 38  protrusions  115 . 1  and  115 . 2  extend obliquely downwards with respect to main planar body of compression part  114 . Such downwards oblique extension contributes to suitably orienting and generating the moment M. 
     Like extension mechanism  104  of  FIGS. 33 to 36 , extension mechanism  104  of  FIGS. 37 and 38  may include a damping elastic member  117 . The damping elastic member  117  may also be comprised of two damping compression helical springs that work parallel to the longitudinal direction X 102 . 
     In a not shown alternative variant, the compression part may have only one protrusion, which may be configured to be located under the centerline of the elongate mounting member. Such a protrusion may for example also extend obliquely downwards with respect to the outer face of the compression part. 
     In order to fasten friction member  134  to compression part  114 , friction member  134  has recesses  135 . 1  and  135 . 2 , which are configured to receive and position, by complementary shapes, the protrusions  115 . 1  and  115 . 2 . Further, friction member  134  has a fitting protrusion  136 , which is configured to fit into a corresponding hole in compression part  114 . A rivet  137  may fasten the compression part  114  to the guide  130 . Alternatively, friction member  134  and compression part  114  may also be glued or adhered to one another. 
       FIGS. 39 to 43  illustrate a sixth embodiment of a mounting element  101 . Inasmuch as the mounting element  101  of  FIGS. 39 to 43  is similar to the mounting dement  101  of  FIGS. 1 to 5 , the afore-detailed description may be applied to the mounting element  101  of  FIGS. 39 to 43 , but for the hereinafter mentioned noticeable differences. An element of mounting clement  101  of  FIGS. 39 to 43  having a structure or function that is substantially similar to an element of the mounting dement  101  of  FIGS. 1 to 5  is given the same reference sign or number. Even though two or more figures illustrating different embodiments may have such elements that are structurally and/or functionally similar, the presence of a same reference sign or number in otherwise different embodiments should not be understood as limiting the disclosure to the specific element nor the scope of protection of the claimed subject-matter. 
     The hereafter-described embodiments are considered in the configuration where the mounting element  101  is fastened to the opposing mounting surfaces, e.g. when the architectural covering  200  is mounted between the two opposing mounting surfaces  302 ,  304  of recess  300 . The mounting element  101  of  FIGS. 39 to 43  differs from the mounting element  101  of  FIGS. 1 to 5  in that it includes a lateral flange  105 , which is configured to come out of a front side  306  of recess  300 . Optionally, lateral flange  105  may be configured to extend along an upper front surface  308  of the wall the recess  300  is located in. 
     Lateral flange  105  may be configured to connect elongate mounting member  102  to covering member  202  of architectural covering  200 . Lateral flange  105  may be configured to support covering member  202  above the level of elongate mounting member  102  when the mounting element  101  is fastened to the opposing mounting surfaces. Covering member  202  and elongate mounting member  102  extend along respective axes which are offset in a direction perpendicular to the longitudinal direction X 102 . Covering member  202  can thus be mounted above and in front of the recess  300 , in a so-called face fit configuration, instead of in the recess  300  like in the example of  FIGS. 1 to 5 . Thus, the windows may be opened inwards and under the rolled-up covering member  202 . Also, covering member  202  may extend beyond the opposing mounting surfaces  302 ,  304  both in the longitudinal direction X 102  and on top of the recess  300 . Thus, a length L 202  of covering member  202  may be larger than a length L 300  of recess  300 . 
     Like in the example of  FIGS. 1 to 5 , architectural covering  200  is mounted between opposing mounting surfaces  302 ,  304  of recess  300 . But, unlike the example of  FIGS. 1 to 5 , architectural covering  200  is not located or extending between the two opposing mounting surfaces  302 ,  304 , nor is the covering member  200  located underneath the elongate mounting member  102 . Elongate mounting member  102  extends along longitudinal direction X 102 . Like in the example of  FIGS. 1 to 5 , mounting element  101  may include an extension mechanism  104  having a compression part  114  and a supplementary extension mechanism  154  having a supplementary compression part  164 . 
     In the example of  FIGS. 40 and 41 , lateral flange  1115  is integral, for example one-piece, with elongate mounting member  102 . Lateral flange  105  may be substantially comprised of a plate, which extends vertically when the mounting element  101  is fastened to the opposing mounting surfaces  302 ,  304 . In a not shown alternative embodiment, the lateral flange and the elongate mounting member may be two separate components that are coupled by suitable fastening elements. Such suitable fastening elements may form a permanent coupling, like rivets, or a dismountable coupling, like bolts. Alternatively, the lateral flange and the elongate mounting member may be fastened by snap fit or friction fit, thus without separate, additional fastening elements. 
     In the example of  FIG. 39 , covering member  202  is a roller blind. Alternatively, the covering member may be a Venetian blind, a pleated blind, a honeycomb blind, roman shade etc. 
     In a not shown alternative embodiment, the lateral flange may be configured to support a covering member beside, e.g. level with, the elongate mounting member when the mounting element is fastened to the opposing mounting surfaces. The lateral flange may be configured to protrude away from the recess when the mounting element is fastened to the opposing mounting surfaces. For example, the lateral flange may extend substantially horizontally or obliquely upwards. 
     Mounting clement tot may include two holding flanges  105 . 3 ,  105 . 4 , which are configured to couple lateral flange  105  to covering member  202  so as to hold the covering member  202 . Each one of holding flanges  105 . 3 ,  105 . 4  substantially includes a holding portion  105 . 31  or  105 . 41 , which is configured to hold a respective end of covering member  202 . The holding portions  105 . 31 ,  105 . 41  may include brackets or clips. Each one of holding flanges  105 . 3 ,  105 . 4  substantially includes a coupling portion  105 . 32  or  105 . 42 , which is configured to be coupled to lateral flange  105 . In the example of  FIGS. 40, 41 and 42 , the longitudinal ends of lateral flange  105  define two respective slots  105 . 6 , which open outwards and are configured to receive a respective coupling portion  105 . 32  or  105 . 42 . Each one of the holding flanges  105 . 3 ,  105 . 4  substantially has an L-shape, which is defined by the holding portion  105 . 31  or  105 . 41  and the coupling portion  105 . 32  or  105 . 42  which respectively extend perpendicularly to each other. 
     In order to assemble coupling portions  105 . 32 ,  105 . 42  to lateral flange  105 , an operator may insert coupling portions  105 . 32 ,  105 . 42  respectively into slots  105 . 6  along the arrows shown in  FIG. 42 . Each coupling portion  105 . 32 ,  105 . 42  may have a tapered end portion in order to facilitate the insertion into the respective slot  105 . 6 . Each coupling portion  105 . 32 ,  105 . 42  may have abutment surfaces that are arranged to abut on respective edges of lateral flange  105 , so as to stop the respective coupling portion  105 . 32  or  105 . 42  at a predetermined position in the longitudinal direction X 102 . 
     Further, the edges of the coupling portions  105 . 32 ,  105 . 42  may have indentations arranged to secure each coupling portion  105 . 32 ,  105 . 42  to lateral flange  105 . For example, the indentations may allow the lateral flange  105  to be plastically deformed into the indentations so as to permanently fasten coupling portions  105 . 32 ,  105 . 42  to lateral flange  105 . In a not shown alternative embodiment, the indentations may cooperate with an elastically deformable part of lateral flange so as to clip coupling portions to lateral flange. 
       FIGS. 44 to 47  illustrate a seventh embodiment of a mounting element  101 . Inasmuch as the mounting element  101  of  FIGS. 44 to 47  is similar to the mounting clement  101  of  FIGS. 39 to 43 , the afore-detailed description may be applied to the mounting element  101  of  FIGS. 44 to 47 , but for the hereinafter mentioned noticeable differences. An element of mounting element  101  of  FIGS. 39 to 43  having a structure or function that is substantially similar to an element of the mounting element  101  of  FIGS. 39 to 43  is given the same reference sign or number. Even though two or more figures illustrating different embodiments may have such elements that are structurally and/or functionally similar, the presence of a same reference sign or number in otherwise different embodiments should not be understood as limiting the disclosure to the specific element nor the scope of protection of the claimed subject-matter. 
     The hereafter-described embodiments are considered in the configuration where the mounting element  101  is fastened to the opposing mounting surfaces  302 ,  304 , e.g. when the architectural covering  200  is mounted between the two opposing mounting surfaces  302 ,  304  of recess  300 . 
     The mounting element  101  of  FIGS. 44 to 47  differs from the mounting element lot of  FIGS. 39 to 43  in that covering member  202  is a Venetian blind instead of a roller blind. Further, the mounting element  101  of  FIGS. 44 to 47  differs from the mounting element  101  of  FIGS. 39 to 43  in that it includes two supporting flanges  105 . 7 ,  105 . 8 . which are configured to support covering member  202 , in lieu of the holding flanges  105 . 3 ,  105 . 4  in  FIGS. 39 to 43 . Each supporting flange  105 . 7 ,  105 . 8  may be fastened to lateral flange  105  by any suitable fastening element, e.g. screws, rivets or welds. In the example of  FIGS. 44 to 47  supporting flanges  105 . 7 . 105 . 8  are a conventional type, herein configured to cooperate by clipping into a frame or headrail of venetian blind  202  and have at least one lever configured to release the clipping connection. 
     Like in the example of  FIGS. 39 to 43  the covering member  202  can thus be mounted above and in front of the recess  300 , in a so-called face fit configuration, instead of in the recess  300  like in the example of  FIGS. 1 to 5 . Thus, the windows may be opened inwards and under the rolled-up covering member  202 . Also, covering member  202  may extend beyond the opposing mounting surfaces both in the longitudinal direction X 102  and on top of the recess  300 . Thus, a length L 202  of covering member  202  may be larger than a length L 300  of recess  300 . 
     Although some exemplary embodiments and aspects have been described above in relation to the exemplary drawings, the present disclosure is not limited to the exemplary embodiments and aspects described above and illustrated in the exemplary drawings wherein the reference numbers are only provided as non-limiting examples. Many changes and alternatives may be made by the skilled person within the scope at the present disclosure, which scope shall not be limited to the appended drawings. The features of the respective exemplary embodiments and aspects may be interchangeably implemented and/or combined in any technically feasible way as long as the resulting subject-matter is covered by the appended claims. 
     In the foregoing description, it will be appreciated that the phrases “at least one”, “one or more”, and “and/or”, as used herein, are open-ended expressions that are both conjunctive and disjunctive in operation. The term “a” or “an” entity, as used herein, refers to one or more of that entity. As such, the terms “a” (or “an”), “one or more” and “at least one” can be used interchangeably herein. All directional references (e.g., proximal, distal, upper, lower, upward, downward, left, right, lateral, longitudinal, front, back, top, bottom, above, below, vertical, horizontal, radial, axial, clockwise, counterclockwise, and/or the like) are only used for identification purposes to aid the reader&#39;s understanding of the present disclosure, and/or serve to distinguish regions of the associated elements from one another, and do not limit the associated element, particularly as to the position, orientation, or use of this disclosure. Connection references (e.g., attached, coupled, connected, and joined) are to be construed broadly and may include intermediate members between a collection of elements and relative movement between elements unless otherwise indicated. As such, connection references do not necessarily infer that two elements are directly connected and in fixed relation to each other. Identification references (e.g., primary, secondary, first, second, third, fourth, etc.) are not intended to connote importance or priority, but are used to distinguish one feature from another. 
     It is to be understood by one of ordinary skill in the art that the present discussion is a description of exemplary embodiments only, and is not intended as limiting the broader aspects of the present disclosure. 
     All apparatuses and methods discussed in this document are examples of apparatuses and/or methods implemented in accordance with one or more principles of this disclosure. These examples are not the only way to implement these principles but ate merely examples. Thus, references to elements or structures or features in the drawings must be appreciated as references to examples of embodiments of the disclosure, and should not be understood as limiting the disclosure to the specific elements, structures, or features illustrated. Other examples of manners of implementing the disclosed principles will occur to a person of ordinary skill in the art upon reading this disclosure. 
     It will be appreciated that although some components are illustrated as separate elements, any two or all three components may be consolidated into an Integral element instead. 
     The or each embodiment illustrated in the figures has several separate and independent features, which each, at least alone, has unique benefits which are desirable for. yet nut critical to, the presently disclosed mounting element. Therefore, the various separate features described herein need not all be present in order to achieve at least some of the desired characteristics and/or benefits described herein. One or more separate features may be combined, or only one of the various features need be present in a mounting element formed in accordance with various principles of the present disclosure. Moreover, throughout the present disclosure, reference numbers are used to indicate a generic element or feature of the disclosed embodiment. The same reference number may be used to indicate elements or features that are not identical in form, shape, structure, etc., yet which provide similar functions or benefits. Additional reference characters (such as letters, as opposed to numbers) may be used to differentiate similar elements or features from one another. 
     The foregoing description has broad application. It should be appreciated that the concepts disclosed herein may apply to many types of shades, in addition to the shades described and depicted herein. Similarly, it should be appreciated that the concepts disclosed herein may apply to many types of mounting elements, in addition to the mounting element  101  described and depicted herein. The discussion of any embodiment is meant only to be explanatory and is not intended to suggest that the scope of the disclosure, including the claims, is limited to these embodiments. In other words, while illustrative embodiments of the disclosure have been described in detail herein, it is to be understood that the inventive concepts may be otherwise variously embodied and employed, and that the appended claims are intended to be construed to include such variations, except as limited by the prior art. 
     While the foregoing description and drawings represent various embodiments, it will be understood that various additions, modifications, and substitutions may be made therein without departing from the spirit and scope of the present disclosure. In particular, it will be clear to those skilled in the art that principles of the present disclosure may be embodied in other forms, structures, arrangements, proportions, and with other elements, materials, and components, without departing from the spirit or essential characteristics thereof. One skilled in the art will appreciate that the disclosure may be used with many modifications of structure, arrangement, proportions, materials, and components and otherwise, used in the practice of the disclosure, which are particularly adapted to specific environments and operative requirements without departing from the principles of the present disclosure. For example, elements shown as integrally formed may be constructed of multiple parts or elements shown as multiple parts may be integrally formed, the operation of elements may be reversed or otherwise varied, the sire or dimensions of the elements may be varied. The presently disclosed embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims, and not limited to the foregoing description. 
     In the claims, the term “comprises/comprising” does not exclude the presence of other elements or steps. Furthermore, although individually listed, a plurality of means, elements or method steps may be implemented by, e.g., a single unit or processor. Additionally, although individual features may be included in different claims, these may possibly advantageously be combined, and the inclusion in different claims does not imply that a combination of features is not feasible and/or advantageous. In addition, singular references do not exclude a plurality. The terms “a”, “an”, “first”, “second”, etc., do not preclude a plurality. Reference signs in the claims are provided merely as a clarifying example and shall not be construed as limiting the scope of the claims in any way. 
     While a mounting element formed in accordance with the principles of the present disclosure is particularly shown and described herein with reference to particular embodiments, it is to be understood that the disclosed embodiments may be used with many additions, substitutions, or modifications of form, structure, arrangement, proportions, materials, and components and otherwise, used in the. practice of the disclosure, which are particularly adapted to specific environments and operative requirements without departing from the spirit and scope of the present disclosure. The presently disclosed embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims, and not limited to the foregoing description. 
     While the foregoing description and drawings represent examples of embodiments of the present subject matter, it will be understood that various additions, modifications, and substitutions may be made therein without departing from the spirit and scope of the present subject matter or the principles thereof. For instance, it will be clear to those skilled in the art that the present subject matter may be embodied in other specific forms, structures, arrangements, proportions, and with other elements, materials, components, and otherwise, such as may be particularly adapted to specific environments and operative requirements, without departing from the spirit or essential characteristics thereof. While the disclosure is presented in terms of embodiments, it should be appreciated that the various separate features of the present subject matter need not all be present in order to achieve at least some of the desired characteristics and/or benefits of the present subject matter or such individual features. It will be appreciated that various features of the disclosure are grouped together in one or more aspects, embodiments, or configurations for the purpose of streamlining the disclosure. However, various features of the certain aspects, embodiments, or configurations of the disclosure may be combined in alternate aspects, embodiments, or configurations, and features described with respect to one embodiment typically may be applied to another embodiment, whether or not explicitly indicated. Accordingly, individual features of any embodiment maybe used and can be claimed separately or in combination with features of that embodiment or any other embodiment. Moreover, elements shown as integrally formed may be constructed of multiple parts or elements shown as multiple parts may be integrally formed, the operation of elements may be reversed or otherwise varied, the size or dimensions of the elements may be varied. Therefore, the present disclosure is not limited to only the embodiments specifically described herein. The presently disclosed embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the claimed subject matter being indicated by the appended claims, and not limited to the foregoing description. 
     The following claims are hereby incorporated into this Detailed Description by this reference, with each claim standing on its own as a separate embodiment of the present disclosure. In the claims, the term “comprises/comprising” does not exclude the presence of other elements or steps. Furthermore, although individually listed, a plurality of moans, elements or method steps may be implemented by, e.g., a single unit or processor. Additionally, although individual features may be included in different claims, these may possibly advantageously be combined, and the inclusion in different claims does not imply that a combination of features is not feasible and/or advantageous. In addition, singular references do not exclude a plurality. The terms “a”, “an”, “first”, “second”, etc., do not preclude a plurality. Reference signs in the claims are provided merely as a clarifying example and shall not be construed as limiting the scope of the claims in any way.