Abstract:
An axle system, and a two-wheeler component with a first dropout and a second dropout and an axle system with an axle for receiving a wheel of a two-wheeler, wherein a clamping mechanism with a tightening device and an end device is provided and equipped to clampingly attach the axle received at the dropouts between the tightening device and the end device. The clamping force is independent of a possibly possible rotary movement of the axle.

Description:
BACKGROUND 
     The present invention relates to an axle system for a two-wheeled vehicle and in particular for a bicycle operated by muscular energy at least in part. The bicycle may be provided with an auxiliary motor drive configured in particular as an electric motor to assist the rider if and as desired. Use is likewise conceivable with other bi- and multicycles. 
     Various axle systems with a quick release mechanism have become known in the prior art to allow fast and easy mounting and demounting of bicycle wheels. 
     In many of the quick releases for bicycles as known in the prior art the clamping force is applied by flipping an eccentric member after adapting the clamping length by means of a tightening nut and a stopper. The drawback of this system is that first the clamping length must be set by means of the tightening nut before the clamping length and the clamping force can be checked by flipping the eccentric member. As a rule a number of cycles is required until the proper clamping length and thus the clamping force are suitable. 
     Due to safety requirements for quick releases the dropouts of modern bicycles tend to be configured not smooth but comprising end bearings for the axle system so as to initially ensure continued safe accommodation of the axle system at the dropouts even after releasing the clamping force. Because of these end bearings or lugs at the dropouts the opened distance must be enlarged wherein the stroke length of a classic quick release lever obtained by flipping the eccentric member is not always sufficient to release the clamping force and to overcome the additionally required lift for overcoming the additional end bearings. Therefore many systems require to operate not only the quick release lever but also to turn the screw nut on the opposite side in the opening direction for removing the wheel every time that a wheel is released and later clamped. Thus the axle system must be adjusted with every wheel change. 
     In EP 1 801 005 B1 a quick release in particular for bicycles has become known offering greater ease of operation. In this quick release the clamping force is not applied by flipping an eccentric member but via a screwed connection. A spring mechanism allows to pull the operating lever axially outwardly out of engagement and to freely turn it back in to quickly tighten the quick release. The known system operates reliably and allows precise adjustment of the clamping force required. Moreover the operating lever may be rotated to any desired direction after setting the clamping force. 
     Due to safety requirements and the increased opened distance which may be for example 5 mm, the quick release lever must be rotated approximately 5 or 6 turns every time that a wheel is released and later clamped, before the wheel can be removed or is again reliably clamped. 
     SUMMARY 
     Against the cited prior art it is the object of the present invention to provide an axle system allowing greater ease of operation and possibly faster wheel changes. 
     An axle system according to the invention comprises an axle for receiving a wheel of a two-wheeled vehicle and is provided with at least one clamping mechanism with at least one tightening device and at least one end device. The at least one clamping mechanism is equipped and provided to clampingly attach a wheel to a two-wheeler component between the tightening device and the end device. The clamping force is independent of a possible rotary movement of the axle. 
     The axle system according to the invention has many advantages. One considerable advantage of the axle system according to the invention consists in the high operational comfort. The clamping force is independent of a possibly possible rotary movement of the axle. One-hand operation is possible since operation is only possible from one side of the axle system. Holding the axle on the other side is not required since transmission of a rotary movement of the axle or rotational force to the axle is not required. 
     In another configuration the axle system according to the invention comprises an axle for receiving a wheel of a two-wheeled vehicle and at least one clamping mechanism with at least one tightening device and at least one end device. The clamping mechanism is equipped and provided to clampingly attach a wheel to a two-wheeler component between the tightening device and the end device. The tightening device receives at least part of a coupling device which is suitable for coupling the axle with the tightening device. The coupling device is free to rotate relative to the tightening device and/or relative to the axle without affecting the clamping force as the coupling device rotates. This means in one configuration that the coupling device is rotatably received at the tightening device without involving any change in the clamping force as the coupling device rotates relative to the tightening device. In the other configuration the coupling device may be non-rotatably received at the tightening device while it is provided to be rotatable relative to the axle. In both these variants the axle may be rotatably or non-rotatably disposed at the axle system or a wheel component. The axle may for example be form-fittingly or frictionally disposed at a dropout of a two-wheeler component. 
     Since in all of the configurations the axle does not, or does not need to, transmit any significant rotational force it is not relevant whether the axle is provided to rotate freely at the axle system or at the two-wheeler component. 
     Preferably an operating lever is provided for adjusting the clamping force. Particularly preferably the operating lever as well as the tightening device are disposed at a first end portion of the axle the end device is provided at a second end portion of the axle. It is possible and preferred for the operating lever with the tightening device to remain at the two-wheeler component when a wheel is removed. With removal the axle system is then divided in two. 
     Preferably at least part of the tightening device is rotatable relative to the axle. In particular is the rotatable part of the tightening device rotatable for tightening about a central axis that is at least parallel to the axle. The rotatable part of the tightening device may be provided symmetrical around the axle. 
     The operating lever may include an eccentric member. 
     Preferably the coupling device is connected with the tightening device which is movable between an engagement position and a release position and which in the engagement position frictionally and in particular form-fittingly retains at least one coupling piece of the axle and which in the release position releases the coupling piece. 
     Another axle system according to the invention is in particular provided for a bicycle and comprises at least one axle for receiving a wheel of a two-wheeled vehicle. The axle system comprises a clamping mechanism with at least one tightening device and at least one end device wherein the at least one clamping mechanism is equipped and provided to clampingly attach a wheel to a two-wheeler component between the tightening device and the end device. The tightening device receives a coupling device which is movable between an engagement position and a release position. In the engagement position the coupling device form-fittingly retains at least one coupling piece of the axle. In the release position the coupling device releases the coupling piece. 
     The axle system according to the invention has many advantages. One considerable advantage of the axle system according to the invention consists in the high operational comfort. The coupling device form-fittingly retaining the coupling piece of the axle is very advantageous since a simple movement from the engagement position to the release position and vice versa releases or form-fittingly receives the coupling piece. Such movement which is very simple to do allows considerably increased operational comfort and faster wheel changes since multiple turns of a quick release are not required. 
     In a preferred more specific embodiment of the axle system according to the invention the tightening device comprises an externally threaded tightening bush at which the coupling device is received. The rotary movement of the tightening bush causes axial displacement of the tightening bush and thus also axial displacement of the coupling device to clampingly fasten or release the two-wheeler component. Transferring the coupling device from the release position to the engagement position establishes a form-fitting connection of the coupling piece of the axle with the coupling device of the tightening device which when the form-fitting connection has been established can very quickly and easily be brought to the desired tightening force by rotating the tightening bush for example one half turn for slight axial displacement. Unlike this, the prior art provides for overcoming considerably larger distances by axial movement requiring multiple turns of the quick release lever. 
     In particular is the tightening device provided to be attached to a dropout of a bicycle component. The tightening device may for example be disposed firmly while in particular being releasable at a bicycle fork or a frame such that in the case of a wheel change the tightening device remains at the bicycle component. This configuration allows pre-setting the required distances at the tightening device so as to require only very slight axial movements of the tightening bush in wheel changes to securely receive a wheel at the bicycle component. 
     Preferably the tightening bush comprises an external thread provided for engaging in an internal thread provided at the dropout. Preferably the internal thread is provided at a bush inserted in the dropout of the wheel component. The bush is in particular firmly inserted in the dropout where it may be glued in such that the internal thread with the bush can be exchanged in the case of defects. 
     Or else it is conceivable to provide the thread in the dropout directly. 
     In an advantageous configuration the tightening bush is connected with an operating lever for tightening and releasing. The operating lever is in particular configured as a quick release lever and may be provided to be rotatable around a central axis of the tightening bush. 
     Typical bicycle hub axles are approximately 5 mm in diameter. Furthermore there exist through axles for example 9 mm in diameter. Since in the presently proposed axle system the tightening device preferably remains as a wheel of the bicycle component is exchanged and since the operating lever is preferably provided at the tightening device, the external diameter of the external thread of the tightening device may be designed considerably larger than in conventional axle systems where a nut is screwed onto the axle end to apply the clamping force required. The considerably larger external diameter of the external thread of the tightening bush allows a larger thread pitch per rotation such that for example a half or a full turn of the operating lever allows to overcome an axial distance of 1, 2, or even 3 mm. This means that one fourth or one half or one full rotation may suffice for applying sufficient clamping force to a received wheel. The prior art, however, requires multiple turns for applying sufficient clamping force. 
     With the proposed axle system one half turn may be sufficient for applying or releasing the clamping force. Subsequently the coupling device is moved from the engagement position to the release position and the coupling piece of the axle is released by the tightening device so as to allow removing a wheel from the bicycle component. This sequence of movements represents high operational comfort causing considerably reduced efforts over the prior art. Furthermore high security is achieved since two different movements are required independent from one another for releasing the wheel at a wheel component. For one, the operating lever must be turned back far enough until the clamping force is reduced and for another the coupling device must be transferred from engagement position to the release position. To this end, a simple, linear movement is sufficient in an advantageous embodiment. 
     Conversely, the efforts required in mounting is also considerably reduced versus the prior art. For mounting, the wheel with the proposed axle system is brought to the bicycle component with the tightening system already mounted to a dropout of the bicycle component. The coupling device is then transferred from the release position to the engagement position in which the coupling piece of the axle and thus the entire axle is form-fittingly connected with the tightening device. Subsequently only the tightening bush of the tightening device must be axially displaced by the operating lever far enough for the clamping force to be sufficient. Since the distances can be predetermined and pre-set because the tightening device remains at the bicycle component, the efforts required therefor are very small. 
     In the engagement position the coupling device surrounds the coupling piece preferably entirely or at least largely. In this way a simple movement of the coupling device form-fittingly retains the coupling piece. 
     Preferably the coupling device comprises at least one engagement component which in transfer from the engagement position to the release position is relocated radially outwardly. Such movement may, other than radial movement, also comprise movement components in the peripheral direction. It is only substantial that in this preferred embodiment the engagement component is radially farther outwardly in the release position than in the engagement position. In the transfer back from the release position to the engagement position the movement is preferably reversed. Or else it is conceivable to employ a different type of movement for bringing the engagement component from radially farther outwardly back to radially inwardly. 
     It is for example possible for an engagement component to comprise a U-shaped or fork-like element which largely encircles the coupling piece or which engages in corresponding receiving bores or corresponding receiving openings of the coupling piece to achieve a form-fitting connection with the coupling piece. 
     In a particularly preferred configuration the coupling device comprises a plurality of engagement components provided distributed in particular symmetrically around a central axis. Two, three or four or more engagement components may for example be provided which in the engagement position are arranged around the coupling piece in particular symmetrically, form-fittingly encircling the coupling piece. With transferring the coupling device from the engagement position to the release position the engagement components are then moved radially outwardly and release a passage in their center releasing the coupling piece and allowing axial displacement of the coupling piece. 
     The engagement components of the coupling device are preferably preloaded and in particular biased radially inwardly by a preloading device. An elastic spring may for example encircle the engagement components outside such that the engagement components are preloaded toward the engagement position provided radially inwardly. In transferring the engagement components of the coupling device to the radially larger release position the engagement components are moved outwardly against the force of the preloading device. 
     Advantageously the tightening device comprises a decoupling device by means of which the coupling device can be transferred at least from the engagement position to the release position. The decoupling device is in particular transferred from the engagement position to the release position by way of linear displacement. Or else a rotary movement of the decoupling device is possible to transfer the coupling device from the engagement position to the release position. 
     In a particularly preferred configuration the decoupling device comprises a cone-shaped element or a cone-shaped region which for transferring the coupling device from the engagement position to the release position interacts with a tubular element of the coupling device. To this end, the cone-shaped region of the decoupling device is aligned coaxially with the tubular element of the coupling device. An axial displacement of the cone-shaped element of the decoupling device onto the tubular element of the coupling device causes expansion of the tubular element of the coupling device such that the individual engagement components of the coupling device are moved radially outwardly. In this way the form-fit of the coupling device with the coupling piece of the axle is disengaged and thus the coupling device is transferred to the release position. 
     By way of a very simple and possibly very short axial movement this configuration causes disengagement of the engaged state of the coupling device and release of the coupling portion after reducing the clamping force by rotating the tightening axle. 
     While the decoupling device may be different in configuration it is in particular suitable to displace the engagement components of the coupling device radially outwardly. 
     The decoupling device is preferably provided to be axially displaceable from a home position to a decoupling position and further to a release position. In the home position the decoupling device is disengaged from the coupling device. By way of transferring the decoupling device from the home position to the decoupling position the coupling device is transferred from the engagement position to the release position and the coupling piece of the axle is released. Further axial displacement of the decoupling device to the release position preferably causes the coupling piece with the axle to be axially displaced in the direction of the side of the end piece. Thus the coupling piece is moved out of the tightening device so as to release the wheel or the axle system. 
     Other than by linear, axial movement such function is possible via rotary movement in which the decoupling device is moved by way of rotary movement from a home position to a decoupling position and further to a release position. A different arrangement of the positions is likewise possible, providing the decoupling position at one side of the home position and the release position at the other side of the home position. 
     In all of the configurations it is preferred for the decoupling device to be preloaded to the home position. Then the decoupling device will be transferred back to the home position for example after removing a wheel. 
     The decoupling device is preferably suitable to axially displace the coupling piece of the axle in transfer from the decoupling position to the release position while activating a preloading device of the end device to thus cause the axle with the coupling piece to be automatically pulled out further on the tightening device. The preloading device may for example be activated by way of pushing a spring washer limiting the preloading spring over a thickened axle section to thus allow the preloading device to expand and thus to pull the end piece of the end device and consequently the axle towards the side of the end device. In this way the coupling piece is pulled out of the tightening device. 
     The end device may comprise a pusher as the end piece with which the axle with the coupling piece can be inserted in the tightening device counter to the force of the preloading device of the end device. By way of pressing the pusher in, the preloading device is preferably biased and secured again by way of pushing the spring washer over an axially thickened axle section. 
     The end device may be fixedly connected with the axle. 
     It is conceivable to manufacture the coupling piece integrally with the axle. Or else it is conceivable for the coupling piece as a separate part to be fixedly—while in particular releasably—connected with the axle. The coupling piece may for example be screwed onto the axle end or, being a hollow part, pushed onto the end and screw-coupled with the axle at a suitable, threaded portion. As a rule no rotational forces are applied to the coupling piece in use but substantially only axial forces act such that a screwed connection may be sufficiently safe. 
     The two-wheeler component according to the invention comprises a first dropout and a second dropout and an axle system with an axle to receive a wheel of a two-wheeler and in particular of a bicycle. A clamping mechanism having at least one tightening device and at least one end device is provided and equipped to clampingly fasten the axle received at the dropouts between the tightening device and the end device. At the tightening device a coupling device is received which is movable between an engagement position and a release position and which in the engagement position retains a coupling piece of the axle in particular form-fittingly and in the release position, releases the coupling piece. 
     Preferably the tightening device comprises a tightening bush at which the coupling device is received axially fixed in one direction and in the other direction, axially movable. The tightening bush comprises an external thread engaging in an internal thread connected with the dropout. 
     In particular is the tightening device secured to a dropout of the two-wheeler component. Particularly preferably is the two-wheeler component equipped with an axle system as it is described above. 
     Particularly preferably is the two-wheeler component configured as a fork frame or as a frame or e.g. as a rear wheel link fork. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       Further advantages and features of the invention are shown in the exemplary embodiments which will be described below with reference to the figures. 
       These show in: 
         FIG. 1  a side view of an inventive bicycle; 
         FIG. 2  a perspective illustration of an axle system and the dropouts of a bicycle component; 
         FIG. 3  another perspective view of the dropouts of a bicycle component; 
         FIG. 4  a section of a hub in the engagement position received at a bicycle component; 
         FIG. 5  an enlarged illustration of the dropout with the end device according to  FIG. 4 ; 
         FIG. 6  an enlarged illustration of the dropout with the tightening device according to  FIG. 4 ; 
         FIG. 7  a perspective view of the tightening device with the decoupling device removed; 
         FIG. 8  the dropout with the tightening device in the decoupling position; 
         FIG. 9  the dropout with the tightening device in the release position; and 
         FIG. 10  an overall section of the hub in the release position received at a bicycle component. 
     
    
    
     DETAILED DESCRIPTION 
     With reference to the  FIGS. 1 to 10  an exemplary embodiment of a two-wheeled vehicle  5  configured as a bicycle will be discussed below. 
     The bicycle  5  shown in  FIG. 1  in a side view comprises a front wheel  3  and a rear wheel  4  each of which is equipped with spokes  35 . The front wheel  3  is retained through a two-wheeler component  9  configured as a fork  33  and the rear wheel  4  is retained at the dropouts of a two-wheeler component  9  configured as a frame  34 . 
       FIG. 2  shows in an enlarged, perspective illustration the dropouts  17 ,  18  of the front wheel fork  33  or of the frame  34  with the axle system  1  wherein the axle  2  has been removed from the dropouts  17  and  18 . A clamping mechanism  6  serves for clamping a wheel to the two-wheeler component. The clamping mechanism  6  comprises a tightening device  7  and an end device  8 . 
     The dropout  17  is provided with the tightening device  7  fixed to the fork. The tightening device  7  is equipped with an operating lever  22  to apply the required clamping force by rotating the operating lever  22 . Since the tightening device  7  remains at the dropout  17 , the axle system  1  may be preset to the corresponding distances such that wheel changes only require minimal rotation of the operating lever  22  to apply the clamping force required. 
     The end of the axle  2 , which is inserted into the dropout  17 , is provided with a stopper  37  presently comprising radially protruding flanges as sealing  51 , protecting the interior of a hub  36  to be received against dirt and humidity which might enter. 
     The configuration allows to provide very large contact surfaces  49  and  50  at the dropouts  17  and  18  so as to allow a very rigid connection. The central axis or axis of symmetry  48  extends through the axle  2  and the axial direction  19  extends along the axle  2 . The end opposite the stopper  37  is provided with an end device  8 . In the presently illustrated release position  30  the pusher  32  of the end device  8  protrudes axially outwardly. With a wheel mounted, the pusher  32  lies in the recess  40  where it is retained by the surrounding material so as to retain a wheel at the bicycle component  9  without any clamping force. 
     For mounting a wheel  3  or  4  to a bicycle  5  the stopper  37  with the contact surface  49  is inserted into the tightening device  7  at the dropout  17  and the tubular region  53  of the end device  8  is inserted into the dropout  18  from below through the gap  52 . Thereafter the pusher  32  is moved in the direction toward the dropout  18  so as to be received by the recess  40  at the dropout  18 . In this position the wheel is already received at the fork  33  secure against falling off. 
       FIG. 3  shows a perspective view at the other dropout  17  where one can clearly see the tightening device  7  with the operating lever  22  and the decoupling device  27 , which comprises an operating knob  46 . 
       FIG. 4  shows a cross-section of a hub  36  received at an axle system  1  in the dropouts  17  and  18  of a bicycle component  9 . The hub comprises a hub axle  57  and bearings  58  to rotatably support the hub  36 . The hub is in the home position and the coupling device  10  is in the engagement position  11 . This is the usual operating condition of a wheel. The coupling device  10  form-fittingly encircles the coupling piece  13  configured as a clamping pin  14 . 
       FIGS. 5 and 6  show enlarged details of the dropout  17  with the tightening device  7  and of the dropout  18  with the end device  8 . In  FIG. 5  the dropout  18  with the end device  8  is illustrated in an enlarged cross-section. The axle  2  extends through the hub  36 . 
     A stopper  38  is provided at the end. A pusher  32  is provided axially outwardly at the end device  8 . The end device  8  is also provided with a preloading device  31  configured as a coil spring and surrounding the axle  2 . The coil spring abuts against a shoulder  44  and is retained biased in the state illustrated in  FIG. 5  by means of a spring washer  43 . The spring washer  43  abuts against an axial shoulder in the form of an axial thickening  41  which prohibits further axial movement of the spring washer  43  unless additional force is applied. Application of large axial force, however, allows the spring washer  43  to expand radially and thus to move across the axial thickening  41 . Then the preloading device  31  is actuated which can pull the pusher  32  with the axle  2  out of the tightening device  7  if the coupling of the coupling piece  13  with the coupling device  10  is disengaged. Then the spring washer  43  is pushed further up to the next axial thickening  42  where it finally prohibits further axial movement of the preloading device  31 . 
     The hub  36  is equipped with a hub flange  45  which serves for attaching the spokes  35  not illustrated in  FIG. 5 . 
       FIG. 6  shows the tightening device  7  in the home position  28  with the coupling device  10  being in the engagement position  11 . This means that the engagement components  23  to  25  of the coupling device  10  form-fittingly encircle the coupling piece  13  configured as a clamping pin  14  and thus firmly couple the tightening device  7  with the end device  8  in the axial direction. 
     The coupling device  10  is received by the tightening bush  15  such that the coupling device  10  is not axially displaceable against the tightening bush  15  in the direction of the end device  8 . A decoupling device  27  serves for transferring the coupling device from the engagement position  11  to a decoupling position  29  illustrated in  FIG. 8 . The decoupling device  27  comprises a pusher or operating knob  46  disposed thereat which serves for operating the decoupling device  27 . The decoupling device  27  comprises a hollow cone  39  which interacts with a tubular region  54  of the coupling device  10  to transfer the coupling device  10  from the engagement position  11  illustrated in  FIG. 6  to the release position  12  illustrated in  FIG. 8 . The inclined cone surface of the cone  39  engages in the tubular region  54  of the coupling device  10 , urging the engagement components  23 ,  24  and  25  of the coupling device  10  radially outwardly over the incline so as to transfer the coupling device  10  from the engagement position  11  illustrated in  FIG. 6  to the release position  12  illustrated in  FIG. 8 . 
       FIG. 7  shows the dropout  17  of the fork  33  with a coupling device  10  removed, with the engagement components  23 ,  24  and  25  removed and drawn radially apart to illustrate their structures. One can clearly recognize the central engagement region  55  and the tubular region  54  formed by respective sections of the three engagement components  23  to  25 . A spring washer or the like serves as a preloading device  26  to preload the engagement components  23  to  25  radially inwardly and thus to urge the coupling device  10  to the engagement position  11 . 
       FIG. 8  shows the start of the removal process wherein firstly the operating lever  22  was turned one half of a full rotation to reduce the clamping force. Thereafter the operating knob  46  of the decoupling device  27  is actuated and transferred from the home position  28  illustrated in  FIG. 6  to the decoupling position  29  illustrated in  FIG. 8 . Absent a releasing of the clamping force via the operating lever  22  a transfer to the decoupling position  29  is virtually impossible though. In transferring to the decoupling position  29  the cone  39  of the decoupling device  27  presses against the tubular region  54  of the coupling device  10 , urging the engagement components  22  to  25  radially outwardly so as to release the coupling piece  13  from the coupling device  10 . 
     In this position the base  56  of the decoupling device  27  may already be closely adjacent to the coupling piece  13  of the axle  2 . Further movement in the axial direction  19  towards the end piece  8  causes axial displacement of the coupling piece  13 . The axial, thickened section  41  (see  FIG. 5 ) is pushed along beneath the spring washer  43  so as to activate the preloading device  31 , displacing the coupling piece  13  virtually abruptly by e.g. between 5 and 15 mm and in particular approximately 10 mm to the right, pulling it out of the tightening device  7 . Thus the axle system  1  is released and a wheel  3  or  4  received at a bicycle component  9  can be removed. Prior to removal the wheel may possibly be supported on a projection or shoulder  47  of the bush  20  or the dropout  17  so as to obtain high operational comfort. 
       FIG. 10  again shows the release position  30  in an overall cross-section. On the right the end device  8  is illustrated where the spring of the preloading device  31  is drawn out up to the axial thickening  42  wherein the spring has pulled the coupling piece  13  out of the tightening device  7 . 
     On the whole the present invention provides an axle system and a two-wheeler component which allow high operational comfort and which enable fast, safe, and easy wheel changes. The double-stage safeguard achieves a high level of safety since even after releasing the clamping force via the operating lever  22  the wheel is still securely received at the fork or the frame of the bicycle. Only an additional step namely, actuating the decoupling device, is required to allow removal of the wheel. 
     
       
         
               
             
               
               
             
           
               
                   
               
               
                 List of reference numerals: 
               
               
                   
               
             
             
               
                   
               
             
          
           
               
                 1 
                 axle system 
               
               
                 2 
                 axle 
               
               
                 3 
                 wheel 
               
               
                 4 
                 wheel 
               
               
                 5 
                 two-wheeler, bicycle 
               
               
                 6 
                 clamping mechanism 
               
               
                 7 
                 tightening device 
               
               
                 8 
                 end device 
               
               
                 9 
                 two-wheeler component 
               
               
                 10 
                 coupling device 
               
               
                 11 
                 engagement position 
               
               
                 12 
                 release position 
               
               
                 13 
                 coupling piece 
               
               
                 14 
                 clamping pin 
               
               
                 15 
                 tightening bush 
               
               
                 16 
                 external thread 
               
               
                 17 
                 dropout 
               
               
                 18 
                 dropout 
               
               
                 19 
                 axial direction 
               
               
                 20 
                 bush 
               
               
                 21 
                 internal thread 
               
               
                 22 
                 operating lever 
               
               
                 23 
                 engagement component 
               
               
                 24 
                 engagement component 
               
               
                 25 
                 engagement component 
               
               
                 26 
                 preloading device 
               
               
                 27 
                 decoupling device 
               
               
                 28 
                 home position 
               
               
                 29 
                 decoupling position 
               
               
                 30 
                 release position 
               
               
                 31 
                 preloading device 
               
               
                 32 
                 pusher 
               
               
                 33 
                 fork 
               
               
                 34 
                 frame 
               
               
                 35 
                 spoke 
               
               
                 36 
                 hub 
               
               
                 37 
                 stopper 
               
               
                 38 
                 stopper 
               
               
                 39 
                 cone 
               
               
                 40 
                 recess 
               
               
                 41 
                 thickened section 
               
               
                 42 
                 thickened section 
               
               
                 43 
                 spring washer 
               
               
                 44 
                 shoulder 
               
               
                 45 
                 hub flange 
               
               
                 46 
                 operating knob 
               
               
                 47 
                 projection 
               
               
                 48 
                 central axle 
               
               
                 49 
                 contact surface 
               
               
                 50 
                 contact surface 
               
               
                 51 
                 seal 
               
               
                 52 
                 slot 
               
               
                 53 
                 tubular region 
               
               
                 54 
                 tube region 
               
               
                 55 
                 engagement region 
               
               
                 56 
                 bottom 
               
               
                 57 
                 hub axle 
               
               
                 58 
                 bearing 
               
               
                 59 
               
               
                 60