Abstract:
Combination of at least one transport securing element and at least one data storage cartridge, the data storage cartridge including a housing which has at least one access opening. The housing encloses at least one tape reel and at least one biased reel brake mechanism. The at least one reel brake mechanism is adapted to prevent movement of the at least one tape reel. The transport securing element is dimensioned to slide in and out of the at least one access opening and is adapted to move the tape reel from a first position to a second position. The at least one transport securing element is free to slide out of the at least one access opening under a biasing force exerted by the reel brake mechanism when a force opposing the biasing force is removed. A method for forming a package is provided in which the at least one cartridge is wrapped.

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS  
         [0001]    The present application claims priority under 35 U.S.C. § 119 of German Patent Application No. 200 21 132.3, filed on Dec. 13, 2000, the disclosure of which is expressly incorporated by reference herein in its entirety.  
         BACKGROUND OF THE INVENTION  
         [0002]    1. Field of the Invention  
           [0003]    The invention relates to a transport securing element which is used with data storage cartridges. The cartridges may be of the type having data recording medium in tape form. The invention also relates to a stack of data storage cartridges which utilizes the transport securing elements as well as a method of storing the data storage cartridges using the transport securing elements.  
           [0004]    2. Description of Related Art  
           [0005]    Data storage cartridges of this type are known for example by the names MTC, DLT and Ultrium and comprise at least: a cartridge housing having an upper housing half and a lower housing half with a tape reel disposed with the housing halves. The housing halves may be releasably or non-releasably connected together to enclose the reel. The upper housing half has cover and side walls, while the lower housing half has a base and side walls. The base of the lower housing half has at least one circular access opening. The tape reel is rotatably mounted in the cartridge housing and is biased to one side with a spring inside the cartridge. The tape reel comprises a lower reel flange, upper reel flange and a hub portion. The data recording medium in tape form is wound up on the hub and has a free end to which a tape guiding element is attached. The tape guiding element aids in guiding the magnetic tape to the take-up reel so that it can be wound up. A part of the tape reel hub protrudes into the access opening and this part has means for coupling the tape reel to the drive hub on an equipment side. Finally, a reel brake is utilized within the cartridge for preventing the tape reel from turning or rotating when the drive hub of the equipment side is not engaged with the tape reel, i.e, when the cartridge is removed from the equipment.  
           [0006]    Among the means which are utilized for coupling the tape reel to the drive hub of the equipment are, for example, driving serrations, which are generally located in the edge region of an end face of the tape reel hub. The serrations may be in the form of disk-shaped metal plates which are formed in the end face itself, and may also have in its center, an annular aperture which serves for centering the tape reel on the drive hub, on the equipment side, and also for releasing the braking serration.  
           [0007]    Various types of reel brakes are known to a person skilled in the art. For example, the reel brake utilized in the MTC or Magstar cartridge comprises a braking part and a spring. This type of cartridge is shown, by way of example, in the description and in the drawings herein.  
           [0008]    The brake reel normally assumes two positions within the cartridge housing. In a first end position or rest position of the tape reel, the cartridge is not coupled to any equipment, i.e., the cartridge is outside the drive. In this case, the tape reel, and particularly its lower reel flange, bears or is forced against an inner side of the housing base under a spring force which acts on one side of the tape reel. However, when the cartridge is loaded into the drive, i.e., installed onto equipment, the reel brake is released by engagement with a drive hub of the drive and the tape reel is raised or moved away from the inner side of the housing base. Thus, the reel within the cartridge has a first un-installed position and a second installed position, i.e., a position wherein the tape reel is free to rotate and operate with equipment because the spring force has been overcome.  
           [0009]    During use or installation of the cartridge in the drive no forces, which may lead to damage of the tape reel or the data recording medium in tape form wound up on it, normally act on the cartridge.  
           [0010]    However, the situation is different when the cartridge is outside or unmounted to the drive. This is particularly true when the cartridge is being transported from the manufacturer&#39;s or dealer&#39;s premises to the end user. The forces which occur during this transportation time may be due to vibrations and improper handling. These forces may be so great that the force exerted by the spring of the reel brake on the tape reel is overcome such that the tape reel is allowed to be moved out of its rest position within the housing. When this happens, it is possible for the tape reel to tilt about its axis of rotation, as well as for the flanges of the tape reel to hit or contact the inner side of the housing cover and/or housing base. This contact almost always results in damage to the relatively thin flanges of the tape reel, i.e., they may be deformed to the extent that a clear width between the flanges, in the region of the reel which remains unwound, changes, and consequently the edges of the data recording medium tape become damaged. As storage capacities have become ever greater, the data recording media, in tape form, becomes thinner and thinner and consequently more and more sensitive to damage. In extreme cases, such damage to these thin tapes has the consequence that the edge tracks or servo tracks of the tape can no longer be read, which can render the cartridge unusable.  
           [0011]    U.S. Pat. No. 5,826,811 describes an insertable plug which is used to prevent the reel from moving within a cartridge. The device is in the form of a reel securing element and is substantially a cap-shaped plug made of plastic. The plug has resilient lip portions arranged on an outer circumference. This plug is utilized by being pushed into the access opening of the lower part of the housing. This causes the tape reel to be pressed against the upper part of the housing. The lip portions of the plug then engage an annular elevation which is provided on the inner side of the lower part of the housing adjacent to the access opening. This action consequently fixes the tape reel within the cartridge. Finally, the plug can be removed from the cartridge by way of a tab or grip which may enter into the plug, so that the cartridge may be ready for use in a drive.  
           [0012]    However, there is a disadvantage to this arrangement, i.e., when the lip portions engage with the lower part of the housing, abrasion occurs, which causes dropouts. This is unacceptable for high-grade data storage systems. Furthermore, removal of the plug is awkward because it has to be removed by hand, or requires the use of a suitable implement.  
         SUMMARY OF THE INVENTION  
         [0013]    The present invention lacks these disadvantages and provides for a transport securing element which does not cause abrasion during insertion into and removal from the cartridge housing, and which can be removed without the aid of implements. Accordingly, the transport securing element is simple in design so as to slide automatically out of the access opening. The invention provides for forming a stack of data storage cartridges which use one or more transport securing elements. Finally, the invention provides for a method of securing the stack of data storage cartridges for transport, wherein one or more transport securing elements are utilized which can be slid automatically out of each cartridge after removal of a wrapping from around the stack.  
           [0014]    The invention provides for a combination of at least one transport securing element and at least one data storage cartridge. The data storage cartridge includes a housing which has at least one access opening. The housing encloses at least one tape reel and at least one biased reel brake mechanism. The at least one reel brake mechanism is adapted to prevent movement of the at least one tape reel. The transport securing element is dimensioned to slide in and out of the at least one access opening and is adapted to move the tape reel from a first position to a second position. The at least one transport securing element is free to slide out of the at least one access opening under a biasing force exerted by the reel brake mechanism when a force opposing the biasing force is removed.  
           [0015]    The at least one transport securing element may be free to move in and out of the at least one access opening without being non-movably retained by the housing. The housing may comprise at least two parts which are one of releasably and non-releasably attached to one another. The at least one transport securing element may be one of substantially disk-shaped and substantially circular. The at least one transport securing element may comprise at least two legs. The at least one access opening may be substantially circular. The at least one tape reel may comprise a reel hub portion and at least two flange portions. The at least one tape reel may comprise a portion which at least partially protrudes into the at least one access opening. The second position may comprise a position wherein the at least one tape reel is positioned against a side of the housing which is opposite to a side of the housing which has the at least one access opening. The tape reel may comprise a hub which protrudes into the at least one access opening, the hub including a mechanism for coupling the at least one tape reel to a drive hub. The at least one tape reel may be movable when the at least one reel brake mechanism is disengaged from the at least one tape reel. The at least one transport securing element may be substantially in the shape of a hollow-cylinder.  
           [0016]    The at least one transport securing element may comprise a thickness, which when added to a thickness of the at least one tape reel, is substantially approximately equal to a width of a space within the housing plus a thickness of a side wall which contains the at least one access opening.  
           [0017]    The at least one transport securing element may comprise a thickness, which when added to a thickness of the at least one tape reel measured on one side of the tape reel and a flange on another side of the tape reel, is substantially approximately equal to a width of a space within the housing plus a thickness of a side wall which contains the at least one access opening.  
           [0018]    The at least one transport securing element may comprise a thickness, which when added to a thickness of the at least one tape reel measured on one side of the tape reel and a flange on another side of the tape reel, is substantially approximately equal to twice a width of a space within the housing plus a thickness of a side wall which contains the at least one access opening.  
           [0019]    The at least one transport securing element may comprise a thickness, which when added to a thickness of the at least one tape reel, is substantially approximately equal to twice a width of a space within the housing plus a thickness of a side wall which contains the at least one access opening.  
           [0020]    The at least one transport securing element may comprise at least one of a circular elevation and an annular elevation. The at least one of the circular or annular elevations may be arranged on a side of the transport securing element which engages the at least one tape reel. At least one of the circular or annular elevations may be arranged on a side of the transport securing element which is opposite a side that engages the at least one tape reel. At least another of the circular or annular elevations may be arranged on a side of the transport securing element which is opposite a side that engages the at least one tape reel.  
           [0021]    The invention also provides for a combination of at least one transport securing element and at least one data storage cartridge. The data storage cartridge comprises a housing which includes at least one access opening. The housing encloses at least one tape reel and at least one biased reel brake mechanism. The at least one reel brake mechanism is adapted to prevent movement of the at least one tape reel. The transport securing element is dimensioned to slide in and out of the at least one access opening and is adapted to move the tape reel from a first position to a second position. The at least one transport securing element is free to slide out of the at least one access opening under a biasing force exerted by the reel brake mechanism when a force opposing the biasing force is removed. The at least one cartridge is wrapped with a material.  
           [0022]    The at least one cartridge may comprise at least two cartridges and at least two transport securing elements, each of the transport securing elements may be free to slide out of the at least one access opening under a biasing force exerted by the reel brake mechanism when a force opposing the biasing force is removed. The at least one cartridge may comprise at least two cartridges arranged with their at least one access openings facing one another, the at least one transport securing element may be free to slide out of both access openings of adjacent cartridges under a biasing force exerted by the reel brake mechanisms when a force opposing the biasing force is removed. The at least one cartridge may comprise a stack of cartridges. The combination may further comprise a plate for preventing the removal of the at least one of the transport securing element. The wrapping may cover the plate and the at least one cartridge.  
           [0023]    The invention further provides for a method combining at least one transport securing element and at least one data storage cartridge, in which the method includes providing the data storage cartridge comprising a housing which includes at least one access opening, the housing enclosing at least one tape reel and at least one biased reel brake mechanism, wherein the at least one reel brake mechanism is adapted to prevent movement of the at least one tape reel, installing the at least one transport securing element into the at least one access opening, the transport securing element being dimensioned to slide in and out of the at least one access opening and being adapted to move the tape reel from a first position to a second position, wherein the at least one transport securing element is free to slide out of the at least one access opening under a biasing force exerted by the reel brake mechanism when a force opposing the biasing force is removed, and wrapping the at least one cartridge with a material.  
           [0024]    The at least one cartridge may comprise at least two cartridges and at least two transport securing elements, each of the transport securing elements being free to slide out of the at least one access opening under a biasing force exerted by the reel brake mechanism when a force opposing the biasing force is removed.  
           [0025]    The at least one cartridge may comprise at least two cartridges arranged with their at least one access openings facing one another, the at least one transport securing element being free to slide out of both access openings of adjacent cartridges under a biasing force exerted by the reel brake mechanisms when a force opposing the biasing force is removed.  
           [0026]    The method may further comprise forming a stack of cartridges. The method may further comprise installing a plate at one end of the stack for preventing the removal of the at least one of the transport securing element. The wrapping may cover the plate and the at least one cartridge. 
       
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       [0027]    The present invention is further described in the detailed description which follows, in reference to the noted plurality of drawings by way of non-limiting examples of embodiments of the present invention, in which like reference numerals represent similar parts throughout the several views of the drawings, and wherein:  
         [0028]    [0028]FIG. 1 a  shows a section through a schematically represented data storage cartridge. The tape reel is located in a lower non-use position and a first embodiment of the transport securing element is shown below the cartridge;  
         [0029]    [0029]FIG. 1 b  shows a section through the data storage cartridge of FIG. 1 a , with the transport securing element being inserted into the cartridge;  
         [0030]    [0030]FIG. 2 a  shows a section through a similar data storage cartridge, again with the tape reel being located in a lower position. A second embodiment of the transport securing element is shown below the cartridge;  
         [0031]    [0031]FIG. 2 b  shows a section through a data storage cartridge of FIG. 2 a , with the transport securing element inserted into the cartridge;  
         [0032]    [0032]FIG. 3 a  shows a section through another similar data storage cartridge, with the tape reel again being located in a lower position. A third embodiment of the transport securing element is shown below the cartridge;  
         [0033]    [0033]FIG. 3 b  shows a section through a data storage cartridge of FIG. 3 a , with the transport securing element inserted into the cartridge;  
         [0034]    [0034]FIG. 4 a  shows a section through still another similar data storage cartridge, with the tape reel again being located in a lower position. A fourth embodiment of the transport securing element is shown below the cartridge;  
         [0035]    [0035]FIG. 4 b  shows a section through a data storage cartridge of FIG. 4 a , with the transport securing element inserted into the cartridge;  
         [0036]    [0036]FIG. 5 a  shows an isometric view of one particular embodiment of transport securing element;  
         [0037]    [0037]FIG. 5 b  shows another isometric view of another particular embodiment of transport securing element;  
         [0038]    [0038]FIG. 5 c  shows an isometric view of still another particular embodiment of transport securing element;  
         [0039]    [0039]FIG. 6 shows a stack of data storage cartridges which utilizes many transport securing elements, with each cartridge in the stack having its own transport securing element inserted therein;  
         [0040]    [0040]FIG. 7 shows a stack of data storage cartridges which utilizes many transport securing elements, with adjacent cartridges in the stack sharing a transport securing element inserted therein; and  
         [0041]    [0041]FIGS. 8 a - c  show various embodiments of transport securing elements of the type which can be used in the stack shown in FIG. 7. These transport securing elements are designed to be inserted into each of the adjacent cartridges shown in FIG. 7. 
     
    
     DETAILED DESCRIPTION OF THE INVENTION  
       [0042]    The particulars shown herein are by way of example and for purposes of illustrative discussion of the embodiments of the present invention only and are presented in the cause of providing what is believed to be the most useful and readily understood description of the principles and conceptual aspects of the present invention. In this regard, no attempt is made to show structural details of the present invention in more detail than is necessary for the fundamental understanding of the present invention, the description taken with the drawings making apparent to those skilled in the art how the several forms of the present invention may be embodied in practice.  
         [0043]    [0043]FIG. 1 shows a first embodiment of a transport securing element  3   a  which can be inserted into a circular access opening  103  of the lower housing part  102  of the cartridge  1 . The cartridge  1  is formed of a two part housing in which an upper housing part  101  is connected to a lower housing part  102 . The two housing parts  101 ,  102  define an interior space V, which accommodates a tape reel  30 , a spring  502  and a reel brake  501 . The tape reel  30  has an upper flange  302  and a lower flange  301  which define a space for holding the wound up tape  40 , i.e., data storage medium. The tape reel also has a hub portion  303  and an end face portion  306 .  
         [0044]    The transport securing element  3   a  is a substantially disk-shaped element which has an outside diameter d 4  that is approximately slightly smaller than the diameter d of the circular access opening  103  in the lower housing half  102 . This provides for a clearance which allows the transport securing element  3   a  to be easily inserted into the circular access opening  103 . A thickness b 4  of the transport securing element  3   a  is designed to be approximately substantially equal to the distance b 0  between an end face  306  of the tape reel hub  303 , which protrudes through the access opening  103 , and an upper abutting position B of the upper reel flange  302  disposed against the upper housing half  101 . The distances B and b 0  added together substantially correspond to a width of the interior space V of the cartridge  1  plus a thickness of the lower housing, or a distance from the bottom of the interior space V to the outer surface  104 . As can be seen from FIGS. 1 a  and  1   b , the distance b 0  substantially corresponds to the thickness b 4  so that the upper flange  302  of the reel  30  is forced to contact the inner surface of the upper housing part  101 , as shown in FIG. 1 b . It is preferred that the thickness b 4  be slightly greater than the distance b 0  so that the upper flange  302  can engage the inner surface of the upper housing part  101 .  
         [0045]    [0045]FIGS. 2 a  and  2   b  show another embodiment the transport securing element  3   b  which can be inserted into the circular access opening  103  of the lower housing part  102 .  
         [0046]    According to this embodiment, the diameter d 3  of the part of the tape reel hub  303  that protrudes into the access opening  103  is significantly smaller than the diameter “d” of the access opening  103 . As a result, an annular space, distance or gap “t” is produced between an outer circumferential surface of the part of the tape reel hub  303  protruding into the opening  103  and an inner circumferential surface of the access opening  103 .  
         [0047]    The transport securing element  3   b  of this embodiment is formed as a substantially hollow-cylindrical design in which an outside diameter d 5  is approximately slightly smaller than the diameter “d” of the circular access opening  103 . An inside diameter d 6  is made slightly larger than the diameter d 3  of the lower reel flange  301  so as to provide clearance for the transport securing element  3   b  to be easily inserted into the annular space “t”. The thickness b 5  of the transport securing element  3   b  is approximately substantially determined by accounting for the distance b 1  between the lower reel flange  301  and the upper abutting position B of the tape reel  30  when the tape reel is positioned against the upper housing half  101  in the interior space V, and the outer surface facing away from the interior space of the lower housing half  102 . It is preferred that the thickness b 5  be slightly greater than the distance b 1  so that the upper flange  302  can engage the inner surface of the upper housing part  101 .  
         [0048]    [0048]FIGS. 3 a  and  3   b  show another embodiment of the transport securing element  3   c  which can be inserted into the circular access opening  103  of the lower housing part  102 .  
         [0049]    According to this embodiment, the transport securing element  3   c  is formed as a substantially disk-shaped element which has, on a side that faces a metal plate  304  which is attached to the hub  303 , annular elevations  31   c ,  32   c  formed thereon. An outside diameter d 7  of an outer annular elevation  31   c  is made approximately slightly smaller than a diameter “d” of the circular access opening  103 . An inside diameter d 8  of the outer annular elevation  31   c  is made approximately slightly larger than a diameter d 3  of the tape reel hub  303  protruding into the access opening  103 . An outside diameter dg of the inner annular elevation  32   c  is made approximately slightly smaller than the diameter d 2  of a concentric aperture  305  formed in the metal plate  304 . An inside diameter d 10  of the inner annular elevation  32   c  is made freely selectable within technical production limits. A thickness b 7  of the transport securing element  3   c  may be substantially determined by accounting for the distance b 2  between the lower reel flange  301  when the tape reel  30  is in the upper abutting position B, i.e., when the tape reel is forced against the upper housing half  101  in the interior space V, and by accounting for the outer surface  104  which faces away from the interior space V. The thickness b 8  of the transport securing element  3   c  may be dimensioned in such a way that the annular elevation  32   c  of the transport securing element  3   c  cannot release the reel brake, i.e., the annular elevation  32   c  is not so thick b 8  so as to be able to disengage reel brake  501  from the reel hub  303 .  
         [0050]    This embodiment has the advantage of limiting the radial mobility of the tape reel  30  during transport, since it provides for the centering of the tape reel  30  within the cartridge  1  by concentrically arranging the diameters d 2  and d. Such centering is facilitated because the tolerance of the diameter d 2  is significantly less than the tolerance of the diameter d 3 . Consequently, the diameter d 9  should be made with close tolerances.  
         [0051]    Still another embodiment is shown in FIGS. 4 a  and  4   b . According to this embodiment, the transport securing element  3   d  has a circular or annular elevation  32   d  that is provided on an upper end face. As with the other embodiments, the transport securing element  3   d  is substantially disk-shaped. However, this embodiment provides for an outer downward facing annular elevation  31   d , i.e, arranged on a face which is opposite the end face that faces the metal plate  304 . The diameters d 7 , d 8 , d 9  and d 10  of the transport securing element  3   d  can be made approximately substantially identical to the embodiment represented in FIG. 3 a . Additionally, the thickness b 9  can also be approximately substantially identical to the thickness b 4  of the embodiment shown in FIGS. 1 a  and  1   b . The thickness b 10  of the transport securing element  3   d  may be made dependent on the dimensions of the reel brake  501  and may be chosen such that the reel brake  501  is not raised, i.e., the annular elevation  32   d  is not so thick b 10  so as to be able to disengage reel brake  501  from the reel hub  303 .  
         [0052]    The invention contemplates that, instead of the annular elevation  32   d , a circular solid elevation (not shown) is provided on the transport securing element  3   d.    
         [0053]    The transport securing element shown in FIGS. 1 a  through  4   b  and described above are basic forms which can be varied as desired according to technical production requirements and design aspects, without leaving the scope of the invention. Thus, as is shown, by way of example in FIG. 5 a , the transport securing element  3   e  may correspond in basic form to the transport securing element  3   c , and further include other features such as, e.g., circular clearances  31   e , which can be provided to save material and/or manufacturing costs. FIGS. 5 b  and  5   c  show other material-optimized variants of the transport securing elements  3   f  and  3   g . These transport securing elements  3   f ,  3   g  may utilize projections  31  or the ends of the legs  31   g  for centering in the circular access opening  103 . The invention also contemplates other designs and is not limited to the number of legs shown. Thus, for example, the number of legs used in the embodiment of FIG. 5 b  can be as few as two and can be greater than the four legs shown. Moreover, the number of legs used in the embodiment of FIG. 5 c  can also be as few as two and can be greater than the three legs shown. Finally, other shapes are also contemplated by the invention wherein the transport securing element is able to easily slide in and out of the circular access opening so as to prevent the reel  30  from moving about within the cartridge  1  and be damaged thereby.  
         [0054]    For logistical reasons, it is generally desirable to supply the end user with many cartridge in the form of large packaging units which comprise a plurality of data storage cartridges. In this regard, many transport securing elements may be used to secure the reels  30  within the cartridges  1 .  
         [0055]    According to the embodiment shown in FIG. 6, a stack  6  of data storage cartridges, e.g.,  1  and  2 , forms a packaging unit. The stack  6  comprises at least two data storage cartridges  1  and  2  and as many transport securing elements or any disclosed design, e.g.,  3   a  through  3   g . These are inserted into the circular access openings  103  of each cartridge. A planar top plate  4  is placed on top of the stack  6  and a wrapping  5  is placed around the entire stack  6  to form the packaging unit.  
         [0056]    As can be seen from FIG. 6, the data storage cartridges may be stacked one on top of the other and in the same alignment such that the access openings  103  all face a direction which is counter to an axial direction Y. However, it is also possible for the stack  6  to be arranged in such a way that the access openings  103  of each cartridge all face in the same axial direction Y (not shown). In either case, the planar top plate  4  is provided to bear against the outer surface  104  of the lower housing half  102  of an end data storage cartridge  2  so as to keep the top transport securing element from coming out of the top cartridge  2  in the stack  6 , i.e, this is because the end data storage cartridge  2  is the cartridge of which the access opening  103  is not covered by an adjacent data storage cartridge. The invention contemplates that any commercially available and acceptable packaging film may be utilized, such as for example shrink films. The invention even contemplates that cardboard or other similar packaging systems may be utilized, provided the dimensions of the packaging are made to match the stack of cartridges.  
         [0057]    It goes without saying that the stack packaging system described above can also be employed for packaging a single data storage cartridge, i.e., this may include e.g., a single cartridge, a single transport securing element  3   a - 3   g , a cover plate  4 , and wrapping  5 .  
         [0058]    Another embodiment of a stack  7  of data storage cartridges is shown FIG. 7. This embodiment comprises at least two data storage cartridges  1  and half as many transport securing elements  3   x - 3   z  (see FIGS. 8 a - 8   c ). These are inserted into the circular access openings  103  of adjacent cartridges and a wrapping  5  is applied to the packing unit. As can be seen in FIG. 7, pairs of data storage cartridges  1  are combined to form one or more sub-double packs which are each arranged in such a way that their access openings  103  face one another. This arrangement consequently allows one transport securing element  3   x ,  3   y  or  3   z , to secure the tape reels  30  of two adjacent data storage cartridges  1 . This advantage of this arrangement of the data storage cartridges is that it does not require the planar top plate  4 . As can be clearly seen from FIG. 7, a plurality of such double packs can be stacked one on top of the other and wrapped with wrapping  5  to form the packing unit.  
         [0059]    The variety of transport securing elements  3   x ,  3   y ,  3   z  which can be used with the stack  7  shown in FIG. 7, are shown in FIGS. 8 a  to  8   c.    
         [0060]    As can be readily seen, the transport securing elements  3   x ,  3   y  differ from the transport securing elements  3   a ,  3   b  shown in FIGS. 1 a  and  2   a  only with regard to their height, with the height b 10 =2×b 4  and the height b 11 =2×b 5 .  
         [0061]    The transport securing element  3   z  shown in FIG. 8 c  corresponds to two transport securing elements of the type (i.e.,  3   c ) shown in FIGS. 3 a  and  3   b , which are joined to each other on the rear sides. This allows both end faces of the transport securing element  3   z  to have the inner and outer annular elevations  31   c ,  32   c . In this embodiment, the height b 12 =2×b 7 .  
         [0062]    As can be seen by a person skilled in the art, the transport securing element  3   d  shown in FIG. 4 a  can also be easily modified in such a way that it performs the function of the transport securing elements shown in FIGS. 8 a - 8   c.    
         [0063]    The invention also provides for various methods of securing a stack  6 ,  7  of data storage cartridges  1  for transport.  
         [0064]    As shown in FIG. 6, the stack  6  of data storage cartridges  1  comprises at least two data storage cartridges  1 ,  2 , and as many transport securing elements, e.g.,  3   a - 3   g , a planar top plate  4  and a wrapping medium  5 , all of which form a packing unit. The packing unit is formed of a first data storage cartridge  1  having a transport securing element, e.g.,  3   a , inserted into its access opening  103 . This may be done by hand or facilitated with a stacking aid (not shown). The insertion is performed in such a way that the access opening  103  provided in the lower part  102  of the housing faces counter to the axial direction Y, that is to say faces upward. Additional cartridges are then placed on top of the first cartridge  1  and each cartridge receives transport securing element with its access opening  103 . The process is continued until an appropriately sized stack  6  is formed. In forming the stack, the cartridges should, of course, be positioned in aligned manner, i.e., each cartridge is placed one on top of the other in such a way that the access openings  103  receives a transport securing element before another cartridge is place over the access opening of the previously deposited cartridge. This procedure is repeated until the desired number of data storage cartridges is reached. The planar top plate  4  may then be placed onto the end data storage cartridge  2  so as to help retain the top transport securing element. This top end data storage cartridge  2  is that cartridge, of which the access opening  103  is not covered by an adjacent data storage cartridge, but is instead covered by the top plantar plate  4 . The stack  6  of data media cartridges formed in this way is then pressed together by the action of an external force which acts in the opposite direction to the restoring forces of the springs  502 . This causes all the upper reel flanges  302  of the tape reels  30  into the upper abutting position B, i.e., the reels  30  are all pressed against the upper housing half  101 . The stack  6  of data storage cartridges under this stress is then stabilized by applying the wrapping  5 . After this, the stack may be removed from the stacking aid (if one is utilized). The stack  6  of data storage cartridges assembled in this way is then ready for shipment, and should arrive at the desired location without damage being caused to the tape reels  30  or to the data recording medium  40 .  
         [0065]    When the wrapping  5  is removed, the action of the external force created by the wrapping is no longer exerted, and the tape reels  30  then return to their lower abutting position A under the action of the restoring forces of the springs  502 . The transport securing elements  3   a - 3   g  should then slide out of the access openings  103  automatically. The data storage cartridges  1  are then consequently ready for use.  
         [0066]    It goes without saying that the stack  7  of data storage cartridges  1  can also be set up in an opposite manner, i.e., with the first data storage cartridge being placed onto the planar top plate  4  such that the access opening  103  faces in the axial direction Y.  
         [0067]    Another embodiment of the method of securing a stack  7  of data storage cartridges  1  for transport is shown in FIG. 7 and comprises arranging the cartridges in a way corresponding to FIG. 7.  
         [0068]    The stack  7  comprises at least two data storage cartridges  1  and half as many transport securing elements, e.g.,  3   x ,  3   y  or  3   z , inserted into the circular access openings  103  of adjacent cartridges. Each set of adjacent cartridges are joined together to form a double pack or sub-assembly. The entire stack  7  may be formed of one or more of these double packs and then wrapped with wrapping  5 .  
         [0069]    Arranged between the two cartridges in each double pack is a transport securing element, e.g.,  3   x ,  3   y , or  3   z . In assembling the stack  7 , a transport securing element is inserted into a first data storage cartridge and a second data storage cartridge is placed onto the first data storage cartridge in such a way that the two circular access openings  103  face one another. A transport securing element  3   x ,  3   y  or  3   z  is used to secure each double pack of the tape reels  30 , i.e, of two adjacent data storage cartridges  1 . The invention also provides that a first double pack is deposited in a stacking aid (not shown). Thereafter, additional data storage cartridges are placed on top of the first double pack to form the stack  7 . These additional double packs may be joined together in the same way as the first double pack until all the double packs are assembled in the stacking aid (not shown). Since, in this arrangement of the cartridges  1 , all the access opening containing surfaces  104  face each other, the planar top plate  4  is not required. As with the method describing the formation of stack  6  of FIG. 6, the stack  7  shown in FIG. 7 may be formed with the data storage cartridges being pressed together by the action of an external force, acting in the opposite direction to the restoring forces of the springs  502 , so that all the upper reel flanges  302  of the tape reels  30  can be forced into the upper abutting position B. Just as in the previous method embodiment, the stack  7  of data storage cartridges which is placed under stress, is then stabilized by applying a wrapping  5 . Thereafter, the stack  7  is removed from the stacking aid (if one is used). The stack  7  of data storage cartridges  1  produced in this way is then ready for shipment without damage being caused to the tape reels  30  or to the data recording medium  40 , or both.  
         [0070]    When the wrapping  5  is removed, the action of the external force is no longer experienced and the tape reels  30  are allowed to return to their lower abutting position A under the action of the restoring forces created by the springs  502 . The transport securing elements will be caused to slide automatically out of the access openings  103  by action of the springs  502  and the data storage cartridges  1  will consequently be ready for use. It should be noted that the use of the transport securing elements described herein is not restricted to data storage cartridges that have a single tape reel. The invention contemplates the use of these devices with cartridges having a plurality (two or more) of tape reels, such as is the case, for example, with video cassettes.  
         [0071]    It should be noted that the transport securing elements  3   a - 3   g  and  3   x - 3   z  can be made of any convenient material which does not cause damage to the cartridges, the reels and the tape medium. Such materials include, but are not limited to materials such as, e.g., plastics, polymers, composites, wood, soft metals such as aluminum, as well as any other convenient materials, etc.  
         [0072]    It is noted that the foregoing examples have been provided merely for the purpose of explanation and are in no way to be construed as limiting of the present invention. While the present invention has been described with reference to certain embodiments, it is understood that the words which have been used herein are words of description and illustration, rather than words of limitation. Changes may be made, within the purview of the appended claims, as presently stated and as amended, without departing from the scope and spirit of the present invention in its aspects. Although the invention has been described herein with reference to particular means, materials and embodiments, the invention is not intended to be limited to the particulars disclosed herein. Instead, the invention extends to all functionally equivalent structures, methods and uses, such as are within the scope of the appended claims.