Abstract:
A fitness handle which is used as an exercise device that allows a resilient cord or tube to move in a linear direction in order to maintain consistent resistance. The fitness handle includes a grip and a frame. The frame includes an opening which allows the cord to slide. The cord or tube has an adjoining portion which fits into the opening of the handle.

Description:
CROSS REFERENCE TO RELATED APPLICATIONS 
       [0001]    The present patent document is a continuation-in-part of U.S. patent application Ser. No. 14/466,415 filed on Aug. 22, 2014, which claims the benefit of the filing date under 35 U.S.C. §119(e) of Provisional U.S. Patent Application Ser. No. 61/868,769, filed Aug. 22, 2013, and which are hereby incorporated by reference in their entirety. 
     
    
     COPYRIGHT NOTICE 
       [0002]    A portion of the disclosure of this patent document contains material which is subject to copyright protection. The copyright owner has no objection to the facsimile reproduction by anyone of the patent document or the patent disclosure, as it appears in the Patent and Trademark Office patent file or records, but otherwise reserves all copyright rights whatsoever. 
       BACKGROUND 
     1. Field of the Invention 
       [0003]    The present disclosure relates generally to exercise devices and methods, and more particularly, to exercise devices and methods relating to resistance training. 
       2. Description of Related Art 
       [0004]    Resistance training is often considered an essential component of any fitness program. A variety of different types of equipment are available for resistance training including free weights, weight machines, resistance bands, etc. Many people prefer using resistance bands/stretchable cords because of their ease of use and portability. Resistance bands generally include handle(s) and a stretchable cord. However, current devices have a fixed point which can limit the exercises a user can perform. Furthermore, current devices are prone to error and thus do not provide consistent and accurate resistance. Additionally, the fixed point can create stress on the cable over time. 
       SUMMARY 
       [0005]    In accordance with the present disclosure, interchangeable rotating free-motion fitness handle systems that may be used by individuals for exercise/physical fitness purposes such as resistance training, and methods for creating them are illustrated and described herein. 
         [0006]    In one example of an interchangeable and rotational resistance tube handle system, a handle used as an exercise device (“fitness handle”) which allows a resilient cord or tube anchor to move or pan in a linear direction in a channel in order to maintain consistent resistance is disclosed. The fitness handle doesn&#39;t require a fixed point for the resistance tube. The fitness handle includes a grip and a frame. The frame includes an opening which allows the cord anchor to slide. The cord/tube/etc. has an adjoining portion which fits into the opening of the handle. 
         [0007]    In another embodiment, a hinge-locking tube anchor and pulley system is disclosed. The mechanism may allow users to create an anchor point from which they are able to generate resistance using resistance tubes. Key features can include, but are not limited to, the outer ends of a component which allow sewn webbing loop, or suitable design, to be applied and removed from the component when the webbing is not under tension. 
         [0008]    It should be noted that this disclosure should not be limited to the embodiments disclosed herein. A variety of other embodiments are also possible using the concepts enclosed herein. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0009]      FIG. 1  illustrates an embodiment of an interchangeable rotating free-motion fitness handle system. 
           [0010]      FIG. 2  illustrates a front view of interchangeable rotating free-motion fitness handle system of  FIG. 1 . 
           [0011]      FIG. 3  illustrates a side view of the anchoring mechanism from the interchangeable rotating free-motion fitness handle system of  FIG. 1 . 
           [0012]      FIG. 4  illustrates a resistance component attached to two anchors from the interchangeable rotating free-motion fitness handle system of  FIG. 1 . 
           [0013]      FIG. 5  illustrates a resistance component from  FIG. 4 . 
           [0014]      FIG. 6A  illustrates a right perspective view of one embodiment of a fitness handle and anchoring mechanism. 
           [0015]      FIG. 6B  illustrates a left perspective view of one embodiment of the fitness handle and anchoring mechanism from  FIG. 6A . 
           [0016]      FIG. 7A  illustrates a front view of an interchangeable rotating free-motion fitness handle system. 
           [0017]      FIG. 7B  illustrates a side view of the interchangeable rotating free-motion fitness handle system from  FIG. 7A . 
           [0018]      FIG. 8A  illustrates a front view of an embodiment of an anchor. 
           [0019]      FIG. 8B  illustrates a front view of an embodiment of an anchor. 
           [0020]      FIG. 8C  illustrates a front view of an embodiment of an anchor. 
           [0021]      FIG. 9A  illustrates a front view of an embodiment of a handle.  FIG. 9B  illustrates a side view of the handle of  FIG. 9A . 
           [0022]      FIG. 10  illustrates a perspective view of an embodiment of a handle of the interchangeable rotating free-motion fitness handle system of  FIG. 1 . 
           [0023]      FIG. 11  illustrates an exploded view of the components of an embodiment of an interchangeable rotating free-motion fitness handle system. 
           [0024]      FIG. 12  illustrates an embodiment of a hinge-locking tube anchor and pulley system. 
           [0025]      FIG. 13A  illustrates an embodiment of a button lock ankle/wrist attachment. 
           [0026]      FIG. 13B  illustrates an embodiment of a webbing cable attachment. 
           [0027]      FIG. 13C  illustrates an embodiment of a webbing cable attachment. 
           [0028]      FIG. 14A  illustrates an embodiment of a multi-attachment point fitness harness. 
           [0029]      FIG. 14B  illustrates an embodiment of a multi-attachment point fitness harness. 
           [0030]      FIG. 15  illustrates an embodiment of a fitness harness. 
           [0031]      FIG. 16  illustrates a front view of an embodiment of a handle system. 
           [0032]      FIG. 17  illustrates a perspective view of a handle from the handle system of  FIG. 16 . 
           [0033]      FIG. 18  illustrates a perspective view of an anchor of from the handle system of  FIG. 16 . 
           [0034]      FIG. 19  illustrates a perspective view of a top receiver from the anchor of  FIG. 18 . 
           [0035]      FIG. 20  illustrates a perspective view of a bottom receiver from the anchor of  FIG. 18 . 
           [0036]      FIG. 21  illustrates a front cross-section view of a grip from the handle system of  FIG. 16 . 
           [0037]      FIG. 22  illustrates a perspective view of a tab from the grip of  FIG. 21 . 
           [0038]      FIG. 23  illustrates a front view of a core from the grip of  FIG. 21  with clip locks inserted into gaps of the core. 
       
    
    
     DESCRIPTION OF PREFERRED EMBODIMENTS 
       [0039]    Reference will now be made to the accompanying drawings, which form a part hereof, and which show, by way of illustration, specific exemplary embodiments. The principles described herein may, however, be embodied in many different forms. The components in the figures are not necessarily to scale, emphasis instead being placed upon illustrating the principles of the invention. In some instances, example measurements are mentioned merely as illustrations of one or more embodiments and not to restrict the invention. Moreover, in the figures, like referenced numerals may be placed to designate corresponding parts throughout the different views. 
         [0040]    An interchangeable rotating free-motion fitness handle system may provide more accurate and consistent results because the tube/cord is always stretching linearly and thus, it&#39;s not manipulated by a fixed point. Additional muscles can be targeted by using the rotational features. 
         [0041]    In one example of an interchangeable rotating free-motion fitness handle system, a fitness handle that features an opening “oculus” that permits a resistance tube anchoring mechanism to enter into a sliding channel such that when combined with a rotational-hand-grip, allows a fitness resistance tube equipped with a resistance tube anchoring mechanism to both pan left and right, and optionally hinge up and down as users move through exercise motions is disclosed. A “barb” that may be located next to the oculus prevents the resistance tube anchoring mechanism from exiting the sliding channel when under any tension. 
         [0042]    A resistance tube anchoring mechanism can be a mechanism that is applied to the tail end(s) of plugged resistance tubes which allows for the tubes to be connected to tube accessories including interchangeable handle(s) and any appropriate accessories. Such accessories may be equipped with, for example, a button-style fabric tube anchor point (see  FIG. 12  for example). Of course, the length and resistance characteristics of the cables/stretch tubes the resistance tube anchoring mechanism is applied to can vary depending on the needs of the user. 
         [0043]    A hinge-locking tube anchor and pulley system may be a mechanism that allows users to create an anchor point from which they are able to generate resistance using resistance tubes. Key features can include, but are not limited to, the outer ends of a component which allow sewn webbing loop, or suitable design, to be applied and removed from the component when said webbing is not under tension. The component may be made of, but of course is not limited to, plastic. Other suitable materials may be also be used. 
         [0044]    When under tension, the webbing loops may secure the component as an anchor point, while allowing it to rotate, creating a pulley which responds to torsion friction applied by the fitness tube, thereby reducing wear/damage to the tube. This removable webbing loop design allows the hinge-locking tube anchor and pulley system to be secured to door hinges to create a superiorly secure anchor point, regardless of user orientation to the door. This allows the system to work on both open and closed doors, and offers the convenience of remaining in place when not in use, if the user so chooses. One additional feature is the larger pulley guide fins that define the outer limits of the pulley space. These large fins respond to pressure coming from the resistance tube, when in use, and adjust the orientation of the pulley to minimize wear on the tubes as different exercise movements are performed. 
         [0045]    A button-lock ankle/wrist attachment allows a sewn or otherwise connected cuff to be attached to body regions of the user without requiring hand-grip. A key feature is the sewn button lock (slit) which receives the resistance tube anchoring mechanism and holds it securely when under tension, similar to the manner a shirt button behaves. The length of fabric between the sewn button lock and the sewn attachment point to the cuff creates a flexible ‘hinge’ which allows the system to remain secure as orientation to the tube forces change. 
         [0046]    Referring to  FIG. 1 , an exemplary embodiment of an interchangeable rotating free-motion fitness handle system is illustrated. Interchangeable rotating free-motion fitness handle system includes cable/stretch tube/resistance band (“fitness tube”)  110  and interchangeable and rotational fitness handle system  120 . 
         [0047]      FIG. 2  illustrates the components of an interchangeable rotating free-motion fitness handle system.  FIG. 2  includes an exemplary stretch tube/resistance band  110 , anchoring mechanism, such as anchor  210 , and fitness handle  220 . Flat slide surface  211  of anchoring mechanism  210  is also illustrated. 
         [0048]    Fitness handle  220  includes a curved frame  225 . Curved frame  225  has a length and two opposing side portions  226 ,  227 . Each of the side portions  226 ,  227  have a length and are parallel to each other along the majority of their length. An arcuate portion  228  extends between an end of each of the opposing side portions  226 ,  227 . A grip  430  is positioned between the opposing ends of opposing side portions  226 ,  227  of frame  225 . Grip  430  may be rotatable. 
         [0049]      FIG. 3  illustrates an embodiment of an anchoring mechanism  210 . Anchoring mechanism  210  includes a barb  440 , a neck  445 , and a connection portion  450 . Neck  445  is positioned between and connects barb  440  to connection portion  450 . As shown, barb  440  has a width that is greater than the width of neck  445 . 
         [0050]    As shown in  FIG. 4 , connection portion  450  may receive a resistance component  110  to attach resistance component  110  to anchoring mechanism  210 . One or both ends of resistance component  110  include a protruding part  115  that has a diameter that is greater than the diameter of resistance component  110  (see  FIG. 5 ). An end of resistance component  110  that includes protruding part  115  may be inserted into connection portion  450  of an anchoring mechanism  210 . 
         [0051]    Connection portion  450  includes a connection opening  455  (also see  FIG. 6A ) and a cavity  457  that may receive resistance component  110 . When resistance component extends through connection opening  455 , protruding part  115  is positioned within cavity  457 . The diameter of protruding part  115  is greater than the diameter of connection opening  455  so protruding part  115  prevents resistance component  110  from being removed from connection portion  450  when tension is applied to resistance component  110 . 
         [0052]      FIGS. 6A-6B  illustrate various views of an embodiment of fitness handle system  120 . Referring briefly to  FIG. 6A , an oculus, such as opening  410  (see  FIG. 7B ), allows the anchoring mechanism  210  to enter into a sliding channel  420  such that when combined with a rotational-hand grip  430  allows a fitness tube to both pan left and right, as well as hinge up and down as users move through exercise motions. 
         [0053]    Anchoring mechanism  210  is positioned within opening  410  so that barb  440  is positioned interior to one of the side portions  226 ,  227  of frame  225 , while connection portion is exterior to the side portion  226 ,  227 . Barb  440  can prevent the anchoring mechanism  210  from exiting sliding channel  420  when under tension. Neck  445  is positioned in sliding channel  420  and has a width that is smaller than the width of sliding channel  420  so anchoring mechanism  210  may slide within sliding channel  420 . 
         [0054]      FIGS. 7A-7B  illustrate fitness handle system  120  after anchoring mechanism  210  has moved along sliding channel  420  so anchoring mechanism  210  is positioned along the arcuate portion  228  of handle  220 . As shown in  FIG. 7B , opening  410  forms one end of sliding channel  420 . Opening  410  has a diameter that is greater than the width of sliding channel  420 . 
         [0055]    In some embodiments, sliding channel  420  may extend in different lengths along frame  225 . For example, in  FIG. 6A , sliding channel  420  begins in side portion  227  and extends along a portion of arcuate portion  228 , but does not extend to side portion  226 . Alternately, as shown in  FIG. 7B , sliding channel  420  may extend along the entirety of arcuate portion  228  of frame  225  and extend along a portion of side portion  226 . 
         [0056]      FIG. 7A  also illustrates a grip axis G defined longitudinally through hand grip  430 , an oculus axis O defined through opening  410 , and an anchor axis A defined through anchoring mechanism  210 . As shown, grip axis G is substantially parallel to oculus axis O. When anchoring mechanism  210  is positioned in opening  410 , anchor axis A is parallel to grip axis G and oculus axis O. However, anchoring mechanism  210  may be slid along sliding channel  420  so that the angle of anchor axis A with respect to grip axis G and oculus axis O may be changed. 
         [0057]      FIGS. 8A-8C  illustrate several embodiments of anchoring mechanism  210  including pill  610 , barrel  620 , and cone  630 . As can be seen, fitness tube  110  can be inserted into the anchoring mechanisms  610 ,  620 , and  630 . 
         [0058]      FIG. 9A  illustrates an alternative embodiment of a fitness handle  720 . Fitness handle  720  includes a curved frame  725  having opposed side portions  726 ,  727  and an arcuate portion  728 . Handle  720  also includes a handgrip  730  with texture provided by grooves  735 . Handgrip  730  is positioned between opposing ends of side portions  726 ,  727 . In some embodiments, handgrip  730  may be rotatable with respect to frame  725 . In some embodiments, as representative dimensions, handgrip  730  may have a length of 4.5 inches. Likewise, the ends of opposing side portions  726 ,  727  and handgrip  730  may have a front to rear width or outer diameter of 1.5 inches. The side portions may include a tapered portion that decreases the width of the ends of side portions  726 ,  727  to 1.25 inches, for example to receive an end of connection bar  940  or a clip lock  910  (see  FIG. 11 ). 
         [0059]    As shown in  FIG. 9B , in some embodiments, handle  720  may include opening  410  and sliding channel  420 . Sliding channel may extend from opening  410  along the majority of the length of side portion  727  and arcuate portion  728 , and along at least a portion of side portion  726 . 
         [0060]      FIG. 10  illustrates an embodiment of an interchangeable rotating free-motion fitness handle system  1005 . Handle system  1005  includes a curved frame  1010  including opposing sides and a sliding channel  1020  defined through a portion of the length of frame  1010 . A handgrip  1030  is attached between the opposing sides of frame  1010 . A pair of anchoring mechanisms  210  engage the sliding channel  1020  so that anchoring mechanisms  210  are slidable within channel  1020 . Alternately, multiple anchoring mechanisms could be used. As shown in  FIG. 10  anchoring mechanisms  210  may slide independently so each anchoring mechanism  210  may be positioned at a different location along the frame  1010 . Each anchoring mechanism  210  may receive a resistance component or resistance component end so that multiple resistance components or two ends of the same resistance component may be attached to handle system  1005 . 
         [0061]      FIG. 11  illustrates a more detailed view of the components of an embodiment of an interchangeable rotating free-motion fitness handle system. This embodiment of an interchangeable rotating free-motion fitness handle system includes clip lock  910 , plastic grip with TPR overmold  920 , frame/main body  930 , connection bar  940  and anchoring mechanism  210 . Plastic grip overmold  920  may be positioned between opposing sides of frame  930  and aligned with grip openings  925  defined in frame  930 . Connection bar  940  may be inserted through one grip opening  925 , then through plastic grip overmold  920 , and then through the other grip opening  925  to attach plastic grip overmold  920  to frame  930  while allowing grip overmold  920  to rotate. Clip lock  910  attaches to the end of connection bar  940  and prevents connection bar  940  from being removed from grip openings  925 . Plastic grip with TPR overmold  920  may provide a comfortable grip to a user and may not be required. While this embodiment uses a plastic grip with TPR overmold, numerous alternative grips are also possible within the scope of the invention. The anchoring mechanism  210  includes resistance band insert  950  for inserting a resistance band. Clip lock  910  may be made from a variety of different materials. In one embodiment clip lock  910  is made of plastic. Other materials may be used within the scope of the invention. Additionally, any specific measurements in this figure and others are illustrated to assist in the understanding of the invention and not to restrict or in any way limit the invention. 
         [0062]      FIG. 12  illustrates one embodiment of a fitness cable anchor and pulley system. Multi cable pulley  1210  may be designed such that it is wear reducing, thus increasing the life of the system. A rib  1220  may be added for strength purposes. Loop  1230  may “lock” onto the pulley  1210  contour when under tension, and may completely encompass the hinge for added safety. Loop  1230  may be sewn. The material of loop  1230  may be made of nylon but any other suitable material can also be used. The system may be used on both sides of the door  1240 . For example, an open door install may be configured to stay up when the door is opened or not in use. 
         [0063]      FIGS. 13A-13C  illustrate one embodiment of a button lock ankle/wrist attachment. In this embodiment, a Velcro strap with a soft-inner-backer is used.  FIGS. 14A-14B  illustrate one embodiment of a multi-attachment point fitness harness.  FIG. 15  illustrates one embodiment of a 360 degree rotating fitness harness. 
         [0064]      FIG. 16  shows an alternative embodiment of a handle  1620 . Handle  1620  includes an anchor  1650  and a grip  1680  extending between opposing sides of frame  1625 . 
         [0065]      FIG. 17  shows a perspective view of a handle frame  1625 . Handle frame  1625  has two opposing side portions  1626 ,  1627  extending from an arcuate portion  1628  to form a horseshoe shape. Each of the side portions  1626 ,  1627  has a length, and side portions  1626 ,  1627  are parallel to each other along the majority of their length. In other embodiments, other frame geometries may be used. 
         [0066]    One end of side portion  1626  includes a grip opening  1634  for receiving an end of grip  1680 . The opposing end of side portion  1627  includes a corresponding and axially aligned grip opening  1634  for receiving the other end of grip  1680 . Each grip opening  1634  opens into a grip cavity  1636  that includes a ledge  1638 . 
         [0067]    An opening, such as oculus  1640 , is defined in side portion  1627 . Oculus  1640  forms an end of a sliding channel  1645  defined in frame  1625  and provides an introduction point for anchor  1650 . The diameter of oculus  1640  is larger than the width of sliding channel  1645 . Oculus  1640  is large enough to allow a portion of anchor  1650  to be inserted through oculus  1640 . Although oculus  1640  is shown in side portion  1627  adjacent to grip  1680 , in other embodiments, oculus  1640  may be defined through side portion  1626  or in other locations along handle frame  1625 . Optionally, oculus  1640  is spaced away from the area where anchor  1650  is located and used during most exercises. 
         [0068]    Sliding channel  1645  extends along at least a portion of the length of frame  1625 . In some embodiments, sliding channel extends from side portion  1627 , through the entirety of arcuate portion  1628 , and along side portion  1626  for a length that is approximately equal to the length at which sliding channel  1645  is defined through side portion  1627 . In other embodiments, the length of sliding channel  1645  may be varied as desired. For example, sliding channel  1645  may extend from side portion  1627  and along only a part of arcuate portion  1628 . In one embodiment, the end of channel  1645  may be located at a midpoint of the arcuate portion, providing a hard stop. 
         [0069]    In some embodiments, grooves  1647  may extend adjacent the length of sliding channel  1645  on the interior side of frame  1625 . A portion of anchor  1650  may be configured to fit within grooves  1647  to keep anchor  1650  within sliding channel  1645  as anchor  1650  slides within channel  1645 . 
         [0070]    An embodiment of anchor  1650  is shown in  FIG. 18 . Anchor  1650  includes a connection portion  1652  that is formed from a top receiver  1655  and a bottom receiver  1670 . A neck  1660  extends from top receiver  1656  and connects to a barb  1656  that is dimensioned to fit through oculus  1640 . An anchor opening  1672  is defined in bottom receiver  1670  and leads to an anchor cavity  1674  (see  FIG. 20 ) that is formed between top receiver  1656  and bottom receiver  1670 . 
         [0071]    A perspective view of top receiver  1656  is shown in  FIG. 19 . As shown, top receiver  1655  includes a barb  1656  and a neck  1660  connecting barb  1656  to top receiver  1655 . The side of top receiver  1655  opposite barb  1656  includes several tabs  1662  arranged around the circumference of top receiver  1655 . Each tab  1662  includes a projection  1663 . Projection  1663  includes a tapered portion  1664  that facilitates projection  1663  entering a slot  1677  in bottom receiver  1670  (see  FIG. 20 ). A step portion  1665  helps to lock top receiver  1655  to bottom receiver  1670  when tab  1662  engages an overhang  1678 . 
         [0072]    Barb  1656  is dimensioned to fit through oculus  1640 , while neck  1660  has a smaller width than barb  1656  so that neck  1660  may fit within sliding channel  1645 . When anchor  1650  is attached to frame  1625 , neck  1645  is within sliding channel  1645  to allow anchor  1650  to slide along the length of sliding channel  1645  by panning left and right. 
         [0073]    In some embodiments, barb  1656  includes a central shaft and a pair of flanges  1657  near the connection to neck  1660 . The central shaft may be cylindrical. Hooked ends of flanges  1657  are configured to fit within the grooves  1647  positioned adjacent to sliding channel  1645 . A user inserts barb  1656  through oculus  1640  with the central shaft aligned with the oculus and with flanges  1657  aligned with sliding channel  1645 . The user then rotates anchor  1650  ninety degrees so that flanges  1657  are aligned with and fit into grooves  1647 . As anchor  1650  slides within sliding channel  1645 , flanges  1657  engage and are guided by grooves  1647 . Grooves  1647  prevent anchor  1650  from rotating when neck  1660  is within sliding channel  1645  and help keep anchor  1650  engaged with sliding channel  1645 . 
         [0074]    A perspective view of bottom receiver  1670  is shown in  FIG. 20 . Cavity  1674  is partially defined in the interior of bottom receiver  1670  leading to anchor opening  1672  (see  FIG. 17 ). A series of channels  1676  and slots  1677  are positioned along the diameter of bottom receiver  1670 . The positioning of channels  1676  corresponds with the position of tabs  1662  of top receiver  1656 . Each slot  1677  includes an overhang  1678 . One or more overhangs  1678  may include a projection  1679  that can engage a step portion  1665  of tab  1662  to lock top receiver  1655  to bottom receiver  1670 . 
         [0075]    As shown by  FIGS. 19-20 , top receiver  1655  and bottom receiver  1670  are two separate pieces that may be connected to form anchor  1650 . To attach a resistance component  110  to anchor  1650 , an end of resistance component  110  that does not include protruding part  115  is threaded through anchor opening  1672  so that the end of resistance component  110  that includes protruding part  115  is positioned in cavity  1674 . Protruding part  115  prevents the adjacent end of resistance component  110  from sliding through anchor opening  1672 . After protruding part  115  is positioned in cavity  1674 , top receiver  1655  is placed on bottom receiver  1670 , by aligning tabs  1662  with channels  1676  and sliding receivers  1655 ,  1670  together. The receivers  1655 ,  1670  are then rotated with respect to each other so that projections  1663  of tabs  1662  rotate into slots  1677 . Tapered portions  1664  of tabs  1662  assist in allowing tabs  1662  to enter and move past projections  1679  and beneath a respective overhang  1678 . Top receiver  1655  is rotated until step portion  1665  aligns with projection  1679 . When fully rotated, projections  1679  may snap into step portions  1665 , locking top receiver  1655  to bottom receiver  1670  with resistance component secured within anchor  1650 . 
         [0076]    Although anchor  1650  shows one method of securing a resistance component to handle  1620 , in other embodiments, alternative securement methods may be used. For example, an anchor similar to anchor  210  may be used. In other examples, the resistance component may be tied to anchor  1650 , a fastener may be used such as a clip, clamp, or anchor plate with holes, or resistance component may be permanently attached to an anchor using a closed loop, adhesive or another suitable method. 
         [0077]      FIG. 21  shows a cross-section of an embodiment of a grip  1680 . Grip  1680  includes a core  1682  having two ends  1684 . In some embodiments, each end  1684  includes a stem  1685  and a head  1686  that has a larger width than stem  1685 . Ends  1684  may be split in half to form a gap  1687  between each half. A tab  1688  can extend from each stem  1685 . Tab  1688  may be clipped on to stem  1685  or tab  1688  may be constructed as a unitary piece with stem  1685 . In some embodiments, one of the tabs  1688  may be removable from stem  1685  or both tabs  1688  may be removable from stem  1685 . As shown in  FIG. 22 , tab  1688  may include flanges  1689  to help secure tab  1688  to stem  1685 . Tab openings  1690  provide tab  1688  with resiliency to expand for removal from stem  1685  or to compress for connection to stem  1685 . 
         [0078]    A grip overmold  1690  may cover core  1682 . In some embodiments, grip overmold  1690  may be rotatable around core  1682 . Optionally, grip overmold  1690  may be made of an easy to grip material such as rubber or any other desired composite material. In other embodiments, grip overmold  1690  may be formed from a plastic, wood, or metal. Overmold  1690  may also be textured or contoured to help improve the grip and prevent a user&#39;s hand from slipping. 
         [0079]    To attach grip  1680  to handle  1620 , at least one of the tabs  1688  is removed from stem  1685 . Core  1682  is slid within grip overmold  1690  so that grip overmold  1690  surrounds core  1682 . Then, each of the ends  1684  is inserted through a respective grip opening  1634  in frame  1625  so that each stem  1685  engages frame  1625  at a grip opening  1634  and head  1686  is positioned within a grip cavity  1636 . Gap  1687  allows stem  1685  and head  1686  to be slightly compressed to fit through grip opening  1634  and then rebound to a wider diameter. The uncompressed diameter of head  1686  is greater than the diameter of grip opening  1634 , so once head  1686  is inserted through grip opening  1634  it is prevented from being removed from grip opening  1634 . Removal of end  1684  from grip opening  1634  requires radial forces to be applied to press the halves of end  1684  together while also pulling end  1684  laterally out of grip opening  1634 . After ends  1684  are inserted through a respective grip opening  1634 , the additional tab  1688  is clipped onto the stem  1685  that does not have a tab  1688 . Connecting a tab  1688  to each stem  1685  helps to prevent grip  1680  from sliding laterally with respect to frame  1625  and prevents core  1682  from rotating. 
         [0080]    In some embodiments, a clip lock  1692  may be placed over each grip opening  1634  so that clip lock  1692  rests on ledge  1638  and covers grip cavity  1636 . Clip lock  1692  may also assist to prevent accidental release of end  1684  from grip opening  1634 . As an example, clip lock  1692  may have an extension  1694  that fits into gap  1687  (see  FIG. 23 ), preventing the halves of end  1684  from being radially compressed, thus preventing end  1684  from being removed from grip opening  1634 . 
         [0081]    Other embodiments of handle  1620  may include different grip arrangements, and/or may use other suitable attachment methods to attach grip  1680  to frame  1625 . For example, the grip may be a unitary structure that is bolted onto frame  1625  or the core may be a bolt and nut arranged within an overmolded portion. In other embodiments, handle  1620  may include an integrally formed grip. The grip may be cylindrical or may have a contoured shape. For example, grip  1680  may include grooves spaced to accommodate a user&#39;s fingers or may be textured to reduce slipping. 
         [0082]    While various embodiments of the invention have been described, it will be apparent to those of ordinary skill in the art that many more embodiments and implementations are possible within the scope of the invention. Accordingly, the invention is not to be restricted, except as set forth in the following claims.