Abstract:
One aspect is a wrap device including first and second hubs. The first hub is configured with first cam features and the second hub is configured with second cam features. The first and second hubs are configured so that one is rotatable relative to the other about an axis in first and second circumferential directions with respect to the hubs. The wrap device includes a wrap configured with a wrap toe and configured to span the first and second hubs. The first and second cam features of the first and second hub control the wrap toe upon relative rotation of first and second hubs such that the wrap toe is deflected in at least one of the first and second circumferential directions, and such that the wrap toe is deflected in a first deflection direction that is different than the first and second circumferential directions.

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS  
       [0001]     This patent application claims priority under 35 U.S.C. § 119(e) to U.S. Provisional Patent Application Ser. No. 60/811,402 entitled “ARM REST CLUTCH,” having a filing date of Jun. 6, 2006, the contents of which are incorporated herein by reference. 
     
    
     BACKGROUND  
       [0002]     One aspect of the present invention relates to a wrap device, and particularly to a wrap device including a wrap toe that is positionally controlled.  
         [0003]     In many applications it may be desirable to pivotally position one element relative to another. For example, it may be desirable to hinge an element relative to a base. Furthermore, it may be desirable to easily move the hinged element relative to the base, and then have the hinged element remain steady in a selective position relative to the base. For example, one application may include a chair having one or more arm rests pivotally mounted on the chair that can be moved up and down in accordance with the user&#39;s desired position. In one case, it may be desirable to allow the user to rotate the arm relative to the chair until it reaches a position desired by the user. Once the user stops moving the arm, the arm then remains locked in that position, especially resistive to downward movement. In this way, it can support the user&#39;s arm which may rest on it.  
         [0004]     In some cases, such pivotally moveable arm rests require a latch or other release mechanism to allow the user to rotate the arm rest to the desired position. Other such systems require a variety of complex parts, which can be expensive, or even noisy in operation.  
         [0005]     For these and other reasons, there exists a need for the present invention.  
       SUMMARY  
       [0006]     One embodiment is a wrap device including an input and an output. The first hub is configured with first cam features and the second hub is configured with second cam features. The first and second hubs are configured so that one is rotatable relative to the other about an axis in first and second circumferential directions with respect to the hubs. The wrap device includes a wrap configured with a wrap toe and configured to span the first and second hubs. The first and second cam features of the first and second hub control the wrap toe upon relative rotation of first and second hubs such that the wrap toe is deflected in at least one of the first and second circumferential directions, and such that the wrap toe is deflected in a first deflection direction that is different than the first and second circumferential directions. 
     
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       [0007]     The accompanying drawings are included to provide a further understanding of the present invention and are incorporated in and constitute a part of this specification. The drawings illustrate the embodiments of the present invention and together with the description serve to explain the principles of the invention. Other embodiments of the present invention and many of the intended advantages of the present invention will be readily appreciated as they become better understood by reference to the following detailed description. The elements of the drawings are not necessarily to scale relative to each other. Like reference numerals designate corresponding similar parts.  
         [0008]      FIG. 1  illustrates of a wrap device in accordance with one embodiment of the present invention.  
         [0009]      FIG. 2  illustrates a cross-sectional view of a wrap device in accordance with one embodiment of the present invention.  
         [0010]      FIG. 3  illustrates a perspective view of an input shaft of a wrap device in accordance with one embodiment of the present invention.  
         [0011]      FIG. 4  illustrates a grounded hub for a wrap device in accordance with one embodiment of the present invention.  
         [0012]      FIG. 5  illustrates a side view of a chair including an arm rest pivoted with a wrap device in accordance with one embodiment of the present invention.  
         [0013]      FIGS. 6-11  illustrates an assembled wrap device at several varying relative positions in accordance with one embodiment of the present invention.  
         [0014]      FIG. 12  illustrates a wrap with wrap toe for a wrap device in accordance with one embodiment of the present invention. 
     
    
     DETAILED DESCRIPTION  
       [0015]     In the following Detailed Description, reference is made to the accompanying drawings, which form a part hereof, and in which is shown by way of illustration specific embodiments in which the invention may be practiced. In this regard, directional terminology, such as “top,” “bottom,” “front,” “back,” “leading,” “trailing,” etc., is used with reference to the orientation of the Figure(s) being described. Because components of embodiments of the present invention can be positioned in a number of different orientations, the directional terminology is used for purposes of illustration and is in no way limiting. It is to be understood that other embodiments may be utilized and structural or logical changes may be made without departing from the scope of the present invention. The following detailed description, therefore, is not to be taken in a limiting sense, and the scope of the present invention is defined by the appended claims.  
         [0016]      FIG. 1  illustrates wrap device  10  in accordance with one embodiment of the present invention. In one embodiment, wrap device  10  includes input shaft  14 , wrap hub  16 , wrap  18 , output hub  20 , grounding hub  21 , and retaining ring  22 , which are illustrated about axis a. In one embodiment, input shaft  14  has an input cam portion  14   a  and a shaft portion  14   b.    
         [0017]     Wrap device  10  is illustrated in  FIG. 1  in an exploded view, and is configured so that the various components can be assembled together.  FIG. 2  illustrates a cross-sectional view of wrap device  10  when it is fully assembled in accordance with one embodiment of the present invention.  
         [0018]     When wrap device  10  is assembled, wrap hub  16  is fixed over the shaft portion  14   b  of input shaft  14 . For example, wrap hub  16  can be press fit onto shaft portion  14   b  such that the two pieces tend to rotate together about axis a. Grounding hub  21  is configured to be fixed to output hub  20  such that a portion of grounding hub  21  extends inside output hub  20 . Grounding hub  21  can be fixed to output hub  20  in a variety of ways. For example, a plurality of screws or bolts (see  FIG. 1 ) can be used to secure grounding hub  21  to output hub  20 . Grounding hub  21  could also be welded or secured in other ways. Alternatively, grounding hub  21  and output hub  20  could be formed as a single unitary part.  
         [0019]     When wrap device  10  is assembled, shaft portion  14   b  of input shaft  14  is inserted through grounding hub  21 , which is partially contained within output hub  20 . In one embodiment, a retaining ring  22  is coupled to an end of shaft portion  14   b  to secure the wrap device  10  together. Once assembled, the configuration of wrap hub  16 , grounding hub  21 , and output hub  20  create an opening in which wrap  18  is contained (See  FIG. 2 ). Wrap  18  spans wrap hub  16  and grounding hub  21  such that a portion of wrap  18  can engage wrap hub  16  and a portion of wrap  18  can engage grounding hub  21 . In one embodiment, an end of wrap  18  is fixed to grounding hub  21 . Wrap  18  can be fixed to grounding hub  21  in any of a variety of ways, including pressing the wrap into a groove, having enough tightly wound wraps, using a toe-engagement feature, or other methods.  
         [0020]     In one embodiment, wrap  18  also includes a wrap toe  24  (See  FIG. 1 ), which is configured over wrap hub  16 . Wrap device  10  is configured such that wrap toe  24  can be controllably manipulated in order to cause wrap  18  to alternatively wrap down onto and wrap open off of wrap hub  16 . When wrap  18  is wrapped down onto wrap hub  16 , wrap hub  16  and grounding hub  21  can be locked together. When wrap  18  is wrapped off of wrap hub  16 , wrap hub  16  can rotate within wrap  18  such that wrap hub  16  and grounding hub  21  can be rotated relative to each other.  
         [0021]     As such, in operation of one embodiment, wrap device  10  is configured such that input shaft  14  and grounded hub  20  may be rotated relative to each other in a controllable fashion. Specifically, one or the other of input shaft  14  and grounded hub  20  can be mounted to a base, while the other is mounted to a rotated member. Wrap device  10  is configured to allow positional control between the rotated member and the base by controlling wrap toe  24  and wrap  18 .  
         [0022]      FIGS. 3 and 4  respectively illustrate input shaft  14  and grounded hub  20 . In one embodiment, input shaft  14  and grounded hub  20  are configured to cooperate in controlling wrap toe  24  as input shaft  14  and grounded hub  20  are rotated relative to each other.  
         [0023]     In one embodiment, input shaft  14  is configured with input cam features. In one example, input cam features include first travel limit  32 , first input shelf  34 , ramp  36 , toe deflect  38 , second input shelf  39  and third travel limit  40 . Also in one embodiment, grounded hub  20  is configured with grounded cam features. In one example, grounded cam features include second travel limit  42 , first grounded shelf  44 , and second grounded shelf  46 . In other embodiments, input cam features and grounded cam features include less than all these features. In other embodiments, input cam features and grounded cam features include additional features.  
         [0024]     In one embodiment, when wrap device  10  is fully assembled, input cam features of input shaft  14  and grounded cam features of grounded hub  20  cooperate to control wrap toe  24  as input shaft  14  and grounded hub  20  are rotated relative to each other. For example, when input shaft  14  is inserted within grounded hub  20 , the input cam features and the grounded cam features form a control slot into which wrap toe  24  extends. As input shaft  14  and grounded hub  20  are rotated relative to each other in the operation of wrap device  10 , the control slot formed by the combination of the input cam features and the grounded cam features changes shape. This change in shape of the control slot can manipulate wrap toe  24  and thus wrap  18 . Manipulation of wrap toe  24  and wrap  18  can control the operation of wrap device  10 , which in one embodiment, can be used to controllably position moveable elements relative to each other.  
         [0025]     In one exemplary embodiment illustrated in  FIG. 5 , wrap device  10  is assembled into a chair  60  with an armrest  62 . Wrap device  10  is installed at location  64  such that it facilitates the rotation of armrest  62  relative to chair  60 . In one example, input shaft  14  is coupled to armrest  62 , while grounded hub  20  is coupled to chair  60 . In this way, wrap device  10  is configured to controllably position armrest  62  relative to chair  60 .  
         [0026]     Chair  60  and armrest  62  illustrated in  FIG. 5  are just one example of wrap device  10  in operation, and various other applications for wrap device  10  are possible as well. The example of  FIG. 5  is used to assist in the explanation of one application of wrap device  10 , but other examples and applications are just as applicable. Furthermore, in the example, input shaft  14  is coupled to armrest  62 , while grounded hub  20  is coupled to chair  60 , but one skilled in the art will understand that wrap device  10  can be configured such that input shaft  14  is coupled to chair, while grounded hub  20  is coupled to armrest  62 .  
         [0027]     In operation, armrest  62  can be rotated between a “full up” position, indicated as position “A” and a “full down” position, indicated as position “D”. Various intermediate positions between these are also possible. Position “C” is indicated where armrest  62  is nearly parallel with the sitting surface of chair  60 , and position “B” is indicated where armrest  62  is slightly above position C.  
         [0028]     In operation of one embodiment of wrap device  10 , wrap toe  24  and wrap  18  are controlled such that wrap device  10  is operable in a one-way mode and in a two-way mode. As used hereinafter, wrap device  10  will be referred to as “set” to the one-way mode and “reset” to the two-way mode.  
         [0029]     When wrap device  10  is reset to the two-way mode, armrest  62  can be moved readily between positions A and B with the application of only a small force to armrest  62 . When set to the one-way mode, however, armrest  62  can only be moved readily from lower positions to higher positions in the direction labeled “up” in  FIG. 5  with the application of a small force to armrest  62 . Application of even a significant force in the “down” direction while wrap device  10  is set in the one-way mode, will not move armrest  62  to lower positions from higher positions in the direction label down in  FIG. 5 . As such, once properly positioned, armrest  62  can function as a rest for a user&#39;s arm and support it in place without rotating downward.  
         [0030]     In one embodiment, wrap device  10  can be changed from a two-way mode to a one-way mode when armrest  62  is moved all the way down to position D. In one embodiment, wrap device  10  can be changed from a one-way mode back to a two-way mode when armrest  62  is moved up to position B. This arrangement allows a user to easily store armrest  62  in position A when not in use, and also to set armrest  62  for use as a weight-bearing rest at any position between positions D and C.  
         [0031]      FIGS. 6-11  illustrate wrap device  10  at several varying relative positions of input shaft  14  to grounded hub  20  in accordance with one embodiment of the present invention. For ease of illustration, grounded hub  20  is considered to be mounted in a fixed angular position, while input hub  14  is rotated in first or second rotation directions R 1  and R 2  about the axis a. One skilled in the art will understand, however, that input shaft  14  can be mounted in a fixed angular position, while grounded hub  20  is rotated in first or second rotation directions R 1  and R 2  about the axis a.  
         [0032]      FIG. 6  illustrates wrap device  10  including input shaft  14  and grounded hub  20 , which are configured to be rotated relative to each other. At the stage of rotation illustrated in  FIG. 6 , first travel limit  32  and first input shelf  34  of input shaft  14  are visible. Also as illustrated, grounded hub  20  includes second travel limit  42  and first grounded shelf  44 . Wrap toe  24  is illustrated extending out between first grounded shelf  44  and first input shelf  34 . The position illustrated in  FIG. 6  is comparable with armrest  62  departing position A in  FIG. 5 , and moving in the down direction.  
         [0033]     In one embodiment, wrap toe  24  is configured in this position to be secured against grounded hub  20  such that wrap  18  is wrapped open off of wrap hub  16 . More specifically, wrap toe  24  is secured against a step that is defined by the transition of first grounded shelf  44  to second grounded shelf  46 . This step is not fully visible in  FIG. 6 , but is illustrated, for example, in  FIG. 4 . As long as wrap toe  24  is secured against the step defined by the transition between first and second grounded shelves  44  and  46 , wrap  18  is prevented from wrapping down onto wrap hub  16 . In this way, wrap device  10  is in the two-way mode, such that input shaft  14  can be rotated in either the first or second rotation directions R 1  and R 2  relative to grounded hub  20  about the axis a, with the application of only a small force to overcome a residual load of wrap device  10 .  
         [0034]     In one embodiment, wrap  18  is configured such that its inner diameter will engage the outer diameter of wrap hub  16  when wrap  18  is in an equilibrium state. When wrap  18  is wrapped open, however, such as when wrap toe  24  is engaged by the step defined between first and second grounded shelves  44  and  46 , there is sufficient clearance for wrap hub  16  to rotate within wrap  18 .  
         [0035]     In one embodiment, first travel limit  32  on input shaft  14  and second travel limit  42  on grounded hub  20  are included so that input shaft  14  can only be rotated a limited distance in second rotation direction R 2 . For example, in  FIG. 6 , it can be seen that as input shaft  14  is rotated in second rotation direction R 2  first travel limit  32  and second travel limit  42  will interfere thereby preventing any further rotation in that direction. Such a feature may be useful, for example, when wrap device  10  is used in an application such as that illustrated in  FIG. 5 . In such an application, when armrest  62  reached position A, for example, the engagement first travel limit  32  and second travel limit  42  can be utilized to prevent armrest  62  from continued rotation beyond the back of seat  60 .  
         [0036]     Again, as long as wrap toe  24  is secured against the step defined by the transition between first and second grounded shelves  44  and  46 , wrap  18  is prevented from wrapping down onto wrap hub  16  and input shaft  14  can be rotated in first rotation direction R 1  relative to grounded hub  20 . As input shaft  14  is rotated in first rotation direction R 1 , wrap toe  24  moves adjacent first input shelf  34  without interfering with it.  
         [0037]      FIG. 7  illustrates wrap device  10  after input shaft  14  has been further rotated in the first rotation direction R 1  relative to grounded hub  20  compared to the positions illustrated in  FIG. 6 . In  FIG. 7 , input shaft  14  has been rotated in the first rotation direction R 1  such that wrap toe  24  has traveled along first input shelf  34  and is just adjacent ramp  36 . Because wrap toe  24  is still secured against the step defined by the transition between first and second grounded shelves  44  and  46 , wrap  18  is still prevented from wrapping down onto wrap hub  16  such that wrap device  10  is in a two-way mode. In the two-way mode, input shaft  14  can be rotated in both first and second rotation directions R 1  and R 2  relative to grounded hub  20 .  
         [0038]     In one embodiment where wrap device  10  is installed in an application such as that illustrated in  FIG. 5  at location  64 , the relative positions of input shaft  14  and grounded hub  20  illustrated in  FIG. 7  may be approximately representative of when armrest  62  is in position B in  FIG. 5 . For example, as armrest  62  is rotated in the down direction indicated in the figure from position A down to position B, the relative positions of input shaft  14  and grounded hub  20  in wrap device  10  is approximately illustrated in  FIG. 7 .  
         [0039]      FIG. 8  illustrates wrap device  10  after input shaft  14  has been further rotated in the first rotation direction R 1  relative to grounded hub  20  compared to the positions illustrated in  FIG. 7 . In  FIG. 8 , input shaft  14  has been rotated in the first rotation direction R 1  such that wrap toe  24  has traveled past ramp  36  and is out over second input shelf  39 . Because wrap toe  24  is still secured against the step defined by the transition between first and second grounded shelves  44  and  46 , however, wrap  18  is still prevented from wrapping down onto wrap hub  16  such that wrap device  10  is still in a two-way mode. In the two-way mode input shaft  14  can be rotated in both first and second rotation directions R 1  and R 2  relative to grounded hub  20 . Second grounded shelf  46  is visible in  FIG. 8 , because in the illustrated position, second grounded shelf  46  of grounded hub  20  has rotated to be adjacent to second input shelf  39 .  
         [0040]     In one embodiment where wrap device  10  is installed in an application such as that illustrated in  FIG. 5  at location  64 , the relative positions of input shaft  14  and grounded hub  20  illustrated in  FIG. 8  may be approximately representative of when armrest  62  is between position C and D in  FIG. 5 .  
         [0041]      FIG. 9  illustrates wrap device  10  after input shaft  14  has been further rotated in the first rotation direction R 1  relative to grounded hub  20  compared to the positions illustrated in  FIG. 8 . In  FIG. 9 , input shaft  14  has been rotated in the first rotation direction R 1  such that wrap toe  24  has traveled up against toe deflect  38 . Any further rotation of input shaft  14  in the first rotation direction R 1  causes wrap toe  24  to deflect against toe deflect  38  in a first deflection direction D 1 , which in one example is generally perpendicular to first and second rotation directions R 1  and R 2  and generally parallel to axis a. As such, this deflection causes wrap toe  24  to move off of the step defined by the transition between first and second grounded shelves  44  and  46 .  
         [0042]      FIG. 10  illustrates wrap device  10  after input shaft  14  has been further rotated in the first rotation direction R 1  relative to grounded hub  20  such that wrap toe  24  has deflected against toe deflect  38  in the first deflection direction D 1  and moved off the step defined by the transition between first and second grounded shelves  44  and  46 . As such, wrap toe  24  has wrapped back in the first rotation direction R 1  below the second grounded shelf  46  and wrap  18  has wrapped down onto wrap hub  16 .  
         [0043]     In one embodiment, this release of wrap toe  24  off of the step defined between first and second grounded shelves  44  and  46  allows wrap  18  to wrap down onto wrap hub  16 . When wrap  18  wraps down onto wrap hub  16 , wrap device  10  transitions from the two-way mode and is set in the one-way mode. In this one-way mode, when input shaft  14  is rotated in the first rotation direction R 1  relative to grounded hub  20 , wrap  18  wraps down on wrap hub  16  preventing further rotation in that direction. In one example, the release of wrap toe  24  off of the step defined between first and second grounded shelves  44  and  46  allows wrap  18  to return to its equilibrium state, in which its inner diameter engages wrap hub  16 .  
         [0044]     In one embodiment, wrap device  10  is configured such that it would take substantial force to overcome the friction between wrap  18  and wrap hub  16  to rotate in the first rotation direction R 1  in the one-way mode, thereby effectively preventing rotation in the first rotation direction R 1 . In this one-way mode, input shaft  14  can still be rotated in the second rotation direction R 2  relative to grounded hub  20 .  
         [0045]     In one exemplary application such as the illustrated in  FIG. 5 , wrap device  10  can be configured in a one-way mode to support significant downward force from a user&#39;s arm without allowing movement in the down direction. In one embodiment where wrap device  10  is installed in an application such as that illustrated in  FIG. 5  at location  64 , the relative positions of input shaft  14  and grounded hub  20  illustrated in  FIG. 10  are approximately representative of when armrest  62  is in position D in  FIG. 5 . For example, as armrest  62  is rotated in the down direction indicated in the figure from position C down to position D, the relative positions of input shaft  14  and grounded hub  20  in wrap device  10  is approximately illustrated in  FIG. 10 .  
         [0046]     Moving armrest  62  to position D can thus set wrap device  10  into the one-way mode from the two-way mode such that the user can still rotate armrest  62  up into a desired position, and then once positioned there, even significant force applied to armrest  62  in the down direction will be supported such that armrest  62  will not rotate down. As such, once positioned in the desired position, armrest  62  functions as a rest and will not rotate even when subjected to significant force of a resting arm of a user.  
         [0047]     Wrap device  10  can also be reset back to the two-way mode from the one-way mode, by rotating input shaft  14  in the second rotation direction R 2  relative to grounded hub  20 .  FIG. 11  illustrates how wrap device  10  can be reset to the two-way mode. As input shaft  14  rotates in the second rotation direction R 2  relative to grounded hub  20 , wrap toe  24  will engage ramp  36  such that it will be deflected in a second deflection direction D 2 . As wrap toe  24  moves up ramp  36  onto first input shelf  34 , it will reengage with the step defined between first and second grounded shelves  44  and  46 . As such, once wrap toe  24  is secured against the step between first and second grounded shelves  44  and  46 , wrap  18  is prevented from wrapping down onto wrap hub  16 . Reset back in the two-way mode, input shaft  14  can be rotated in either the first or second rotation directions R 1  and R 2  relative to grounded hub  20  about the axis a.  
         [0048]     In one exemplary application such as the illustrated in  FIG. 5 , wrap device  10  can be configured to be reset back into the two-way mode so that armrest  62  can be rotated both up and down. In one embodiment where wrap device  10  is installed in an application such as that illustrated in  FIG. 5  at location  64 , the relative positions of input shaft  14  and grounded hub  20  illustrated in  FIG. 11  are approximately representative of when armrest  62  is in position C in  FIG. 5 . For example, as armrest  62  is rotated in the up direction indicated in the figure from position D up to position C, the relative positions of input shaft  14  and grounded hub  20  in wrap device  10  is approximately illustrated in  FIG. 11 .  
         [0049]     In one embodiment where wrap device  10  is configured in an application such as that illustrated in  FIG. 5 , first travel limit  32 , second travel limit  42  and third travel limit  40  are configured to only allow a certain range of relative rotation. For example, in one embodiment, armrest  62  can only be rotated up to position A, and then first travel limit  32  and second travel limit  42  will contact such that further rotation of armrest  62  is prevented. Similarly, armrest  62  can only be rotated down to position D, and then second travel limit  42  and third travel limit  40  will contact such that further rotation of armrest  62  is prevented. One skilled in the art will understand that first through third travel limits  32 ,  42  and  40  can be configured to allow a larger range of rotation, or even be configured to avoid engagement between them at all so that there is no restriction on rotation, and input shaft  14  and grounded hub  20  can be rotated 360 degrees.  
         [0050]     In one embodiment, the release of wrap toe  24  off the step between first and second grounded shelves  44  and  46  to set wrap device into the one-way mode can be accomplished without toe deflect  38 . In one example, wrap  18  and wrap toe  24  are configured such that wrap toe  24  can be moved in the first deflection direction D 1  as soon as wrap toe  24  clears first input shelf  34 .  
         [0051]     For example, viewing  FIGS. 7 and 8 , as input shaft  14  is rotated in the first rotation direction R 1 , wrap toe  24  travels off first input shelf  34  over ramp  36 , and once past ramp  36 , over second input shelf  39 . In one embodiment of wrap device  10 , a slight reverse rotation, that is, a rotation of input shaft  14  in the second rotation direction R 2 , will release wrap toe  24  from the step between first and second grounded shelves  44  and  46 . As such, when wrap toe  24  has moved off first input shelf  34  and is over second input shelf  39 , this slight reverse rotation in the second rotation direction R 2 , or “reverse set” feature, will change wrap device  10  from the two-way mode to the one-way mode.  
         [0052]     In one embodiment where wrap device  10  is configured in an application such as that illustrated in  FIG. 5 , such a reverse set feature can be useful. For example, with such a configuration, armrest  62  would not need to be rotated down to position D to in order to set wrap device  10  into the one-way mode from the two-way mode. Instead, a user could simply rotate armrest down to a desired position while in the two-way mode, and then reverse set by reversing armrest  62  to rotate slightly up such that wrap device will set to the one-way mode. Once there, even significant force applied to armrest  62  in the down direction will be supported such that armrest  62  will not rotate down.  
         [0053]     In one embodiment, the reverse set configuration can be accomplished with a wrap  48  illustrated in  FIG. 12 . Wrap  48  is configured that wrap toe  54  extends axially out from main portion  56  of wrap  48  when wrap  48  is in an equilibrium state. When such a wrap  48  is configured in wrap device  10 , ramp  36  will force wrap toe  54  adjacent main portion  56  of wrap  48  such that wrap toe  54  engages the step defined between first and second grounded shelves  44  and  46 . When wrap toe  48  travels off first input shelf  34  and over second input shelf  39 , however, even a slight reverse rotation will cause wrap  48  to return to its equilibrium state. In other words, under reverse rotation wrap toe  54  will move away from main portion  56  of wrap  48  in the first deflection direction D 1 . This reverse set will change wrap device  10  from the two-way mode to the one-way mode.  
         [0054]     Various other configurations of wraps  18  and  48  can also be implemented to achieve the reverse set configuration for wrap device  10 . For example, wrap  18  can be wound such that it is tapered gradually toward the end with wrap toe  24 . Also, the diameter of wrap  18  can be slightly tapered so that there is more interference between wrap  18  and wrap hub  16  away from wrap toe  24  and less interference between wrap  18  and wrap hub  16  closer to wrap toe  24 . These and various other techniques can allow achievement of the reverse set configuration for wrap device  10 .  
         [0055]     Although specific embodiments have been illustrated and described herein, it will be appreciated by those of ordinary skill in the art that a variety of alternate and/or equivalent implementations may be substituted for the specific embodiments shown and described without departing from the scope of the present invention. For example, although wrap  18  is illustrated in the figures as alternatively wrapping down onto and wrapping open off of wrap hub  16  as wrap toe is controlled by cam features, a wrap hub could also be configured as a hollowed cylinder, such that a wrap could be configured inside the wrap hub. As such, the wrap could alternatively wrap out against the interior of the wrap hub to engage it in a one-way mode, and then wrap in away from the wrap hub changing to a two-way mode. The changing between the modes could still be accomplished by controlling wrap toe with cam features.  
         [0056]     This application is intended to cover any adaptations or variations of the specific embodiments discussed herein. Therefore, it is intended that this invention be limited only by the claims and the equivalents thereof.