Patent Publication Number: US-2016221623-A1

Title: Bicycle kick stand-combined pump and kick stand having detachable pump

Description:
TECHNICAL FIELD 
     The present invention relates to a bicycle kickstand-combined pump and a kickstand having a detachable pump and, more particularly, a bicycle kickstand-combined pump and a kickstand having a detachable pump which can be assembled with a quick release lever device, and which can be used as a kickstand under normal conditions and may be separated from the bicycle and used as a pump when there is the need of injection of air into a tire. 
     BACKGROUND ART 
     Generally, in the case of a two-wheeled vehicle, typically, a bicycle, other than a four-wheeled vehicle, a kickstand is fixed to and installed on a frame for a rear wheel so as to support the bicycle in an upright position when parking, because the bicycle has only two wheels. 
     The kickstand is configured such that when parking the bicycle, one end of the kickstand is on the ground and the other end thereof is coupled to the bicycle so as to support the bicycle, whereby the bicycle can be kept upright in an inclined state. 
     The kickstand is operated according to a general usage in which when it is desired to move the bicycle, a user pushes the kickstand using his/her foot and rotates it rearward to 90 degrees to make the kickstand horizontal. 
     Furthermore, the kickstand is configured such that when the user uses his/her foot and pushes, for parking, the kickstand that has been in the horizontal state, the kickstand is rotated to be returned to the above-mentioned parking state. 
     Such a kickstand is seldom used for other purposes other than for its intended purpose as a kickstand. Furthermore, recently, according to a bicycle design trend to reduce the weight of a bicycle, parts which are not necessary to operate the bicycle are being omitted. Thus, among bicycles that are sold on the market, there are many bicycles having no kickstand. 
     A kickstand for a bicycle according to a conventional art is problematic in that because it has another function other than the purpose of allowing the bicycle to be kept upright when parking, it has little functional effect in consideration of an increase in weight of the bicycle. 
     Generally, bicycles are moved with two wheels. Given this, when a tire is flat or the air pressure in the tire is low, the tire must be inflated. In this case, a pump for supplying air into the tire is required. A typical pump is configured such that it is removably coupled to a part of a frame of the bicycle through a predetermined type holder. 
     As such, the bicycle according to the conventional art is configured to make the user have to carry a separate pump or to be removably coupled to the frame of the bicycle through the holder. In the case of the configuration using the separate holder, there is a problem in that the weight of the bicycle is increased. 
     To overcome the above-mentioned problems of the conventional art, a related technique was proposed in Chinese Utility Model Unexamined Publication No. 2077493. In this Utility Model, a pump for bicycles which can be used for various purposes was introduced. The pump of this Utility Model is configured to be used not only as a pump by being coupled to pedals of a bicycle but also as a kickstand. 
     However, the pump for bicycles according to this conventional art has a complex structure with a large number of parts and thus goes against the recent trend to reduce the weight of the bicycle. Moreover, there are problems in that a method for using the pump is very complex and difficult, and much time it takes to separate the pump from the bicycle is required. 
     DISCLOSURE 
     Technical Problem 
     Various embodiments are directed to a bicycle kickstand-combined pump which is assembled with a quick release lever device and thus can be easily coupled to or separated from a bicycle, and which can be used as a pump in such a way that it is separated from the bicycle and then a portion thereof is bent by 90 degrees and used as a foothold. 
     Also, various embodiments are directed to primarily reducing the weight by combination of a kickstand and a pump, secondarily reducing the weight by the configuration in which there is no separate coupling device because a quick release lever is used to couple the kickstand-combined pump to the bicycle or separate it therefrom, and improving convenience of use. 
     Further, various embodiments are directed to a kickstand having a detachable pump which is installed on a quick release lever device and is configured such that the pump is detachably coupled to the lower end of the kickstand, so that the kickstand can be used for its intended purpose and also used as a pump after being separated from the bicycle when needed. 
     Technical Solution 
     In an embodiment, a bicycle kickstand-combined pump assembled to a bicycle by a quick release lever device by which a rear wheel of the bicycle is assembled to a frame may include: an assembly plate tightened and assembled by the quick release lever device; a rotating unit coupled to the assembly plate and provided with a rotating shaft so as to be rotatable between a parking position and a moving position; and a pump installed to extend from a lower end of the rotating unit. 
     An upper end of the pump may be inserted into the lower end of the rotating unit, and a tension spring may be installed therebetween. 
     Hinge members may respectively protrude from the lower end of the rotating unit and an upper end of the pump and be coupled to each other so as to be rotatable by a hinge shaft. A hole may be formed in the hinge member of the pump and have a rectangular upper part and a circular lower part, and the hinge shaft may have a rectangular end. A plurality of protrusions may be provided on the assembly plate and thus increase frictional force to prevent the assembly plate from being removed after assembly. 
     A discharge portion may be provided on a side surface of a body of the pump so that compressed air is discharged from the pump through the discharge port. 
     Threaded parts may be formed on an inner surface of a cylinder pipe of the pump and an outer surface of a piston pipe of the pump so that the piston pipe is prevented from being moved downward by its own weight. 
     A wire hole may be formed in the assembly plate so that a wire of a locking device for anti-theft purpose can pass through the assembly plate through the wire hole. 
     In another embodiment, a kickstand having a detachable pump, assembled to a bicycle by a quick release lever device by which a rear wheel of the bicycle is assembled to a frame, may include: an assembly plate tightened and assembled by the quick release lever device; a rotating unit coupled to the assembly plate and provided with a rotating shaft so as to be rotatable between a parking position and a moving position; and a pump detachably assembled to a lower end of the rotating unit so as to be assemblable with and disassemblable from each other. 
     A plurality of protrusions may be provided on the assembly plate and thus increase frictional force to prevent the assembly plate from being removed after assembly. 
     A discharge portion may be provided on a side surface of a body of the pump so that compressed air is discharged from the pump through the discharge port. 
     Threaded parts may be formed on an inner surface of a cylinder pipe of the pump and an outer surface of a piston pipe of the pump so that the piston pipe is prevented from being moved downward by its own weight. 
     A nut may be provided on any one of the lower end of the rotating unit and an upper end of the pump, and a bolt may be provided on the other so that the rotating unit and the pump are assembled with each other. 
     A central depression may be formed in a central portion of the lower end of the rotating unit, and a central protrusion may be provided on an upper end of the pump and inserted into the central depression. A plurality of O-rings may be fitted over an outer surface of the central protrusion so that the rotating unit and the pump are assembled with each other by force-fitting. 
     A central depression may be formed in a central portion of the lower end of the rotating unit. A central protrusion may be provided on an upper end of the pump and inserted into the central depression. A locking pin may be assembled with the rotating unit and the pump through the central depression and the central protrusion. The locking unit may include: an outer pipe provided with a stop protrusion on an end thereof; an operating rod inserted into the outer pipe; a spring configured to push the operating rod outward; a locking bolt fixed to an end of the operating rod and configured to prevent the operating rod from being removed from the outer pipe; and a plurality of balls inserted into a plurality of side holes formed in a side surface of the outer pipe. When the locking pin is at a locked position, a portion of each of the balls may be disposed in the corresponding side hole of the outer pipe, and another portion thereof may protrude outward from the side hole. When the locking pin is at a separation position, the ball may be disposed in a reduced diameter part of the operating rod and thus completely inserted inside the side hole so as to allow the locking pin to be removed from the central depression and the central protrusion. 
     Advantageous Effects 
     The present invention has the following effects. 
     (1) The bicycle kickstand-combined pump according to the present invention can primarily reduce the weight by combination of a kickstand and a pump and secondarily reduce the weight by the configuration in which there is no separate coupling device because a quick release lever is used to couple the kickstand-combined pump to the bicycle or separate it therefrom. 
     (2) The bicycle kickstand-combined pump according to the present invention is configured such that it is installed so as to be detachable along with a rear wheel by the quick release lever device. Therefore, the kickstand-combined pump can be rapidly and conveniently separated from the bicycle and used as a pump. 
     (3) The bicycle kickstand-combined pump according to the present invention is configured such that it is separated from the quick release lever and then a portion thereof is bent by 90 degrees to allow a user to step on the bent portion and use the present invention as a pump. Therefore, the kickstand-combined pump can discharge a high pressure of air and thus inflate a tire with air of a sufficient pressure. 
     (4) In the bicycle kickstand-combined pump according to the present invention, an assembly plate which is coupled with the quick release lever device has at a predetermined position a wire hole through which a wire of a locking device can pass, thus providing an anti-theft function. 
     (5) The bicycle kickstand-combined pump according to the present invention can not only be used as a kickstand under normal conditions but can also be used as a pump after being separated from the bicycle when needed. Therefore, it is convenient because there is no need of carrying a separate pump. 
     (6) Because the bicycle kickstand-combined pump according to the present invention is a part which is assembled with the bicycle by the quick release lever, the user can rapidly and easily separate the kickstand-combined pump from the bicycle, selectively. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG. 1  is a perspective view illustrating a state in which a bicycle kickstand-combined pump according to a first embodiment of the present invention is positioned at a parking position. 
         FIG. 2  is a perspective view illustrating a state in which the bicycle kickstand-combined pump according to the first embodiment of the present invention is positioned at a moving position. 
         FIG. 3  is an exploded perspective view showing the bicycle kickstand-combined pump according to the first embodiment of the present invention separated from a bicycle. 
         FIG. 4  is a perspective view of the bicycle kickstand-combined pump according to the first embodiment of the present invention. 
         FIG. 5  is an exploded perspective view of the bicycle kickstand-combined pump according to the first embodiment of the present invention. 
         FIG. 6  is a partially sectional view showing an example of the use of the bicycle kickstand-combined pump according to the first embodiment of the present invention. 
         FIG. 7  is a perspective view of a bicycle kickstand-combined pump according to a first embodiment of the present invention. 
         FIG. 8  is a perspective view of a bicycle kickstand-combined pump according to a third embodiment of the present invention. 
         FIG. 9  is an exploded perspective view of the bicycle kickstand-combined pump according to the third embodiment of the present invention. 
         FIG. 10  is a perspective view of a bicycle kickstand-combined pump according to a fourth embodiment of the present invention. 
         FIG. 11  is a partially sectional view showing an example of the use of the bicycle kickstand-combined pump according to the first embodiment of the present invention. 
         FIG. 12  is a perspective view illustrating a state in which a kickstand having a detachable pump according to a first embodiment of the present invention is positioned at a parking position. 
         FIG. 13  is a perspective view illustrating a state in which the kickstand having the detachable pump according to the first embodiment of the present invention is positioned at a moving position. 
         FIG. 14  is an exploded perspective view showing the kickstand having the detachable pump according to the first embodiment of the present invention separated from a bicycle. 
         FIG. 15  is a perspective view of the kickstand having the detachable pump according to the first embodiment of the present invention separated from a bicycle. 
         FIG. 16  shows a partially sectional view and an enlarged view of the kickstand having the detachable pump according to the first embodiment of the present invention. 
         FIG. 17  is a partially sectional view illustrating a kickstand having a detachable pump according to a second embodiment of the present invention. 
         FIG. 18  shows a partially sectional view and an enlarged view of a kickstand having a detachable pump according to a third embodiment of the present invention. 
         FIG. 19  shows a sectional view and a partially enlarged view of a locking pin of the kickstand having the detachable pump according to the third embodiment of the present invention. 
     
    
    
     MODE FOR INVENTION 
     The above-described aspects, features and advantages of the present invention will be more apparent from the following detailed description. Hereinafter, embodiments according to the present invention will be described in detail with reference to the accompanying drawings. 
     Referring to  FIGS. 1 to 6 , a bicycle kickstand-combined pump  100  according to an embodiment of the present invention is assembled to a bicycle by a quick release level device  30  by which a rear wheel  20  of the bicycle is assembled to a frame  10 . The bicycle kickstand-combined pump  100  includes an assembly plate  110  which is tightened and assembled by the quick release level device  30 , a rotating unit which is coupled to the assembly plate  110  and provided with a rotating shaft  123  so as to be rotatable between a parking position and a moving position, and a pump  140  which is installed to extend from a lower end of the rotating unit. 
     Referring to  FIGS. 1 and 2 , the bicycle kickstand-combined pump  100  according to the present invention may be primarily used as a kickstand.  FIG. 1  shows a state in which the kickstand-combined pump  100  supports the bicycle on the ground when parking. 
     In  FIG. 1 , an upper end of the kickstand-combined pump  100  is coupled and fastened to a central portion of the rear wheel  20 , and a lower end thereof comes into contact with the ground and supports the inclined bicycle. 
       FIG. 2  shows a state in which the upper end of the kickstand-combined pump  100  is rotated around its own position by 90 degrees and thus oriented parallel to the ground. In this state, the bicycle is allowed to move. 
     In  FIG. 3 , there is illustrated a process of installing the kickstand-combined pump  100  according to the present invention on the quick release lever device  30 . 
     The quick release lever device  30  is a device which is widely used and has a structure for allowing a part to be literally rapidly coupled to or separated from another part. Briefly, the quick release lever device  30  include a bolt  32  provided with a lever  31  on a front end thereof, and a nut  33  coupled to the other end of the bolt  32 , and is configured such that the quick release lever device  30  is tightened and fixed by tightening the bolt  32  into the nut  33  to an appropriate degree and pushing the lever  31 . Due to this configuration, rapid coupling or decoupling of parts is secured. 
     As shown in  FIG. 3 , the rear wheel  20  generally includes a central hub  23 , spokes  22  which are radially disposed around the central hub  23 , and a tire  21  which is provided on an outer surface of a tube that is installed on a rim coupled to outer ends of the spokes  22 . This rear wheel  20  is the same configuration as that of a typical bicycle rear wheel. 
     The present invention is applied to a bicycle that uses the quick release lever device  30  to couple the rear wheel  20  to the bicycle frame  10 . 
     In  FIG. 3 , the rear wheel  20  is configured so as to be removable from the frame  10  by the quick release lever device  30 . The bicycle kickstand-combined pump  100  according to the present invention is mounted, along with the rear wheel  20 , to the frame  10  by the quick release lever device  30 . 
     Referring to  FIG. 4 , there is illustrated a perspective view of the bicycle kickstand-combined pump  100  according to the present invention. 
     The assembly plate  110  is a planar member having a U-shaped notch  110   a  in an upper end thereof. Of course, the bolt  32  of the quick release lever device  30  is inserted into the U-shaped notch  110   a . The assembly plate  110  is tightened by the quick release lever device  30  and thus fastened to the bicycle frame  10 . 
     Therefore, the bicycle kickstand-combined pump  100  can be rapidly separated from the bicycle merely by releasing the quick release lever  30 . 
     The assembly plate  110  has a plurality of small protrusions  110   b  that function to increase frictional force with another part making contact therewith after assembling and thereby reliably retain the assembled state. 
     The rotating unit is installed below the assembly plate  110 . Referring to  FIGS. 4 and 5 , the rotating unit includes a lever  125  which is installed between two fastening plates  121  and  122  so as to be rotatable by the rotating shaft  123 , a spring  126  which is fitted over an outer surface of the lever  125 , and a cap  124  which is also fitted over the outer surface of the lever  125  and supported by the spring  126 . Therefore, when the lever  125  is forcibly pushed, it is allowed to change in position between the parking position of  FIG. 1  and the moving position of  FIG. 2  while overcoming the elastic force of the spring  126 . This configuration is well known in the related art; therefore, further explanation will be omitted. 
     Referring to  FIG. 5 , an upper end of the pump  140  is inserted into a lower end of the cap  124  that is a lower end of the rotating unit. The lower end of the lever  125  and the upper end of the pump  140  are coupled to each other by a tension spring  130 . It is preferable that a tension spring having a relatively large tensile force be used as the tension spring  130 . 
     Due to this configuration, the operation shown in  FIG. 6  is possible. In detail, when the entirety of the rotating unit is pulled downward in  FIG. 6 , the tension spring  130  extends, whereby the cap  124  is also separated from the upper end of the pump  140 . In this state, when the rotating unit is bent by 90 degrees, it becomes as shown in the right view of  FIG. 6 . In the 90-degree bent state, a user may step on the rotating unit and use the pump  140 . In this regard, a depression is formed in the upper end of the pump  140  in which the extension spring is disposed, so that when the extension spring is bent by 90 degrees, it can pass therethrough. 
     As such, when the pump is used, it enables the user to step on a portion thereof, whereby the maximum allowed pump pressure can be increased. In other words, compared to the case where the user uses his/her one hand to fix a cylinder pipe  141  and uses the other hand to reciprocate a piston pipe  142 , the pressure which can be generated by the pump  140  is increased. 
     Referring to  FIG. 5 , the pump  140  includes the upper cylinder pipe  141  and the piston pipe  142  which is inserted into the cylinder pipe  141 . An air discharge port  141   a  is formed on a side surface of the upper end of the cylinder pipe  141 . Furthermore, the piston pipe  142  is configured such that a hose  143  having connectors  143   a  and  144   a  on opposite ends thereof can be received in the piston pipe  142 . After the hose  143  has been received in the piston pipe  142 , a lower end of the piston pipe  142  is closed with a stopper  145  by threaded-coupling using a threaded part  142   c . The stopper  145  is preferably made of steel. 
     Thread parts  141   b  and  142   a  are respectively formed on an inner surface of the cylinder pipe  141  and an outer surface of the piston pipe  142  of the pump  140 , thus preventing the piston  142  from being moved downward by its own weight. 
     The bicycle kickstand-combined pump  100  having the above-mentioned configuration can be rapidly assembled to or separated from the bicycle by the quick release lever device  30 . Particularly, when the bicycle kickstand-combined pump  100  separated from the bicycle is used as a pump, because the user can bend a portion of the pump  100  by 90 degrees and step on the bent portion, the pump  100  can generate high pressure. 
     In  FIG. 7 , there is illustrated a second embodiment according to the present invention. As shown in the drawing, the general shape of the second embodiment is the same as that of the first embodiment. However, there is a difference in that the assembly plate  210  has a wire hole  210   c  for insertion of a wire of a locking device. The configuration having the wire hole  210   c  can be used for anti-theft purpose. 
     Furthermore, in lieu of the locking hole, a locking device may be integrally formed on the assembly plate, of course. 
     That is, the assembly plate  210  is formed of a planar member having a U-shaped notch  210   a , and a plurality of protrusions  210   b  are formed on the surface thereof. When the assembly plate  210  is assembled by the quick release lever  30 , a portion of the assembly plate  210  protrudes outward, and the wire hole  210   c  is formed in the protruding portion. 
       FIGS. 8 and 9  illustrate a bicycle kickstand-combined pump  340  according to a third embodiment of the present invention. As shown in the drawing, in the third embodiment, the assembly plate  310  has a hook shape, while a plurality of small protrusions  310   b  are formed on the surface thereof in the same manner as that of the preceding embodiments. 
     Particularly, hinge members  325   a  and  340   a  respectively protrude from the lower end of the lever  325  and the upper end of the pump  340  and are coupled to each other so as to be rotatable by a hinge shaft  327 . A hole is formed in the hinge member  325   a , and the hole includes a rectangular hole  325   b  formed at an upper position, and a circular hole  325   c  formed at a lower position. An end of the hinge shaft  327  is formed in a rectangular shape. 
     In more detail, a medial portion of the hinge shaft  327  has a circular cross-section, and opposite ends thereof have a rectangular cross-section. Therefore, when the hinge shaft  327  is disposed in the upper rectangular hole  325   b , it cannot rotate, but when it is disposed in the lower circular hole  325   c , it is allowed to rotate. 
     If the kickstand-combined pump  340  stands upright while making contact with the ground for the use of a kickstand, the hinge shaft  327  is disposed in the rectangular hole  325   b  and thus not allowed to rotate. Therefore, the kickstand-combined pump  340  can reliably function as a kickstand. Of course, when the kickstand-combined pump  340  is used as a pump, the hinge shaft  327  is disposed in the circular hole  325   c . Then, the pump  340  can be bent in the same manner as that of the first embodiment, so as to enable the user to step on the bent portion and use it as a pump. 
     In  FIGS. 10 and 11 , there is illustrated a bicycle kickstand-combined pump  440  according to a fourth embodiment of the present invention. 
     As shown in the drawings, in the bicycle kickstand-combined pump  440 , a cylinder pipe  441  is cut at 45 degrees and divided into a first pipe  441  and a second pipe  446  which have cut surfaces. Therefore, the first and second pipes  441  and  446  can be rotated on the cut surfaces by 90 degrees. In this case, the user can step on the rotated portion and use the pump. 
     In this embodiment, a rotating shaft  446   a  protrudes from the second pipe  446 , and a through hole into which the rotating shaft  446   a  is inserted is formed in the first pipe  441 . A nut member  447  is installed on an end of the through hole. Of course, there is no threaded part in the through hole so as to allow the rotating shaft  446   a  to rotate in the through hole. 
     Moreover, a cylinder is formed in only the first pipe  441  without being formed in the second pipe  446 . 
     Hereinafter, a detachable pump according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. 
     As shown in  FIGS. 11 to 16 , a kickstand  500  having a detachable pump according to a first embodiment of the present invention is assembled to a bicycle by a quick release lever device  30  by which a rear wheel  20  of the bicycle is assembled to the frame  10 . The kickstand  500  includes an assembly plate  510  which is fastened and assembled by the quick release lever device  30 , a rotating unit  520  which is coupled to the assembly plate  510  and provided with a rotating shaft  523  so as to be rotatable between a parking position and a moving position, and a pump  540  which is detachably assembled to a lower end of the rotating unit  520  so as to be assemblable with and disassemblable from each other. 
     Referring to  FIG. 15 , a plurality of protrusions  510   b  are provided on the assembly plate  510  to increase frictional force and prevent the assembly plate  510  from being undesirably removed after it has been assembled with the bicycle. 
     Furthermore, referring to  FIG. 5 , an air discharge port  541   b  through which compressed air is discharged from the pump  540  is provided on a side surface of a cylinder pipe  541  that is a pump body. 
     Threaded parts (not shown) are respectively formed on an inner surface of the cylinder pipe  541  and an outer surface of a piston pipe  542  of the pump  140 , thus preventing the piston pipe  542  from being moved downward by its own weight. 
     Particularly, referring to  FIG. 16 , a nut  525   a  is provided on a lower end of the rotating unit  520 , and a bolt  541   a  is provided on an upper end of the pump  540  so that they are assembled with each other. 
     Referring to  FIGS. 12 and 13 , the kickstand  500  having the detachable pump according to the present invention may be primarily used as a kickstand.  FIG. 12  shows a state in which the kickstand  500  supports the bicycle on the ground when parking. 
     In  FIG. 12 , an upper end of the kickstand  500  is coupled and fastened to a central portion of the rear wheel  20 , and a lower end thereof comes into contact with the ground and supports the inclined bicycle. 
       FIG. 13  shows a state in which the upper end of the kickstand  500  is rotated around its own position by 90 degrees and thus oriented parallel to the ground. In this state, the bicycle is allowed to move. 
     In  FIG. 14 , there is illustrated a process of installing the kickstand  500  according to the present invention on the quick release lever device  30 . 
     The quick release lever device  30  is a device which is widely used and has a structure for allowing a part to be literally rapidly coupled to or separated from another part. Briefly, the quick release lever device  30  include a bolt  32  provided with a lever  31  on a front end thereof, and a nut  33  coupled to the other end of the bolt  32 , and is configured such that the quick release lever device  30  is tightened and fixed by tightening the bolt  32  into the nut  33  to an appropriate degree and pushing the lever  31 . Due to this configuration, rapid coupling or decoupling of parts is secured. 
     As shown in  FIG. 14 , the rear wheel  20  generally includes a central hub  23 , spokes  22  which are radially disposed around the central hub  23 , and a tire  21  which is provided on an outer surface of a tube that is installed on a rim coupled to outer ends of the spokes  22 . This rear wheel  20  is the same configuration as that of a typical bicycle rear wheel. 
     The present invention is applied to a bicycle that uses the quick release lever device  30  to couple the rear wheel  20  to a bicycle frame  10 . 
     In  FIG. 14 , the rear wheel  20  is configured so as to be removable from the frame  10  by the quick release lever device  30 . The kickstand  500  having the detachable pump according to the present invention is mounted, along with the rear wheel  20 , to the frame  10  by the quick release lever device  30 . 
     Referring to  FIG. 15 , the kickstand  500  is mounted to the bicycle as the assembly plate  510  is coupled and mounted to the bicycle by the quick release lever device  30 . 
     The assembly plate  510  is a planar member having a U-shaped notch  510   a  in an upper end thereof. Of course, the bolt  32  of the quick release lever device  30  is inserted into the U-shaped notch  510   a . The assembly plate  510  is tightened by the quick release lever device  30  and thus fastened to the bicycle frame  10 . 
     Therefore, the kickstand  500  can be rapidly separated from the bicycle merely by releasing the quick release lever  30 . 
     The assembly plate  510  has a plurality of small protrusions  510   b  that function to increase frictional force with another part making contact therewith after assembling and thereby reliably retain the assembled state. 
     The rotating unit  520  is installed below the assembly plate  510 . Referring to  FIGS. 15 and 16 , the rotating unit  520  includes a lever  525  which is installed between two fastening plates  521  and  522  so as to be rotatable by the rotating shaft  523 , a spring (not shown) which is fitted over an outer surface of the lever  525 , and a cap  524  which is also fitted over the outer surface of the lever  525  and supported by the spring. Therefore, when the lever  525  is forcibly pushed, it is allowed to change in position between the parking position of  FIG. 12  and the moving position of  FIG. 13  while overcoming the elastic force of the spring. This configuration is well known in the related art; therefore, further explanation will be omitted. 
     Referring to  FIG. 16 , the nut  525   a  is provided on the lower end of the lever  525 , and the bolt  541   a  which is assembled with the nut  525   a  is provided on the upper end of the pump  540 , that is, the upper end of the cylinder pipe  541 . Due to this configuration, the entirety of the pump  540  can be assembled to or disassembled from the rotating unit  520 . Furthermore, the separation of the pump  540  can be performed not only rapidly but also easily and conveniently. 
     Therefore, the user uses the kickstand for its intended purpose under normal conditions. To use the pump  540 , if the user rotates the pump  540  and separates the bolt  541   a  and the nut  525   a  from each other, the pump  540  can be easily completely separated from the bicycle. Then, the user can use the pump  540  to inject air into the tire. 
     The pump  540  can be manufactured by remodeling an upper end of a typical pump. The pump  540  having the same structure as that of the typical pump includes the upper cylinder pipe  541 , and the piston pipe  542  which is inserted into the cylinder pipe  541  and reciprocates to compress air and supply it to a target. 
     A stopper  543  is fitted over the lower end of the piston pipe  542 . The stopper  543  is a part which comes into contact with the ground when the kickstand is used for its intended purpose. Preferably, the stopper  543  is made of steel. 
     Particularly, the air discharge port  541   b  is provided on the upper end of the pump cylinder pipe  541 . In this embodiment, the air discharge port  541   b  is provided on the side surface of the cylinder pipe  541 . A hose  544 , which is received in the piston pipe  542  under normal conditions, may be coupled to the air discharge port  54   b  so as to pump up the tire. 
     In  FIG. 16 , there is illustrated the case where the hose  544  is coupled to the air discharge port  541   b . When it is desired to use the pump, the bolt  541   a  is removed from the nut  525   a.    
     A partial sectional view of a kickstand according to a second embodiment of the present invention is shown in FIG.  17 . As shown in the drawing, a central depression  525   a ′ is formed in a central portion of the lower end of the lever  525 . A central protrusion  541   a ′ is provided on the upper end of the cylinder pipe  541 ′ of the pump and configured to be inserted into the central depression  525   a ′. A plurality of O-rings  550  are provided on an outer surface of the central protrusion  541   a ′ by force-fitting. 
     Two kinds of methods may be used for installation of the O-rings  550 . In the case of (a), circumferential grooves  525   b ′ are circumferentially formed in an inner surface of the central depression  525   a ′ at positions at which the O-rings  550  are disposed. In the case of (b), circumferential grooves  541   b ′ are formed in the outer surface of the central protrusion  541   a ′, and the O-rings  550  are installed in the circumferential grooves  541   b′.    
     With the O-rings installed in the above-mentioned manner, the upper end of the pump cylinder pipe  541 ′ is pushed and inserted into the central depression  525 ′ a  of the lever  525  or pulled and removed therefrom. 
     Because the O-rings  550  are made of rubber, the assembly or disassembly of the corresponding parts is performed in a force-fitting manner using high frictional force. 
     Partial sectional views of a kickstand according to a third embodiment of the present invention are shown in FIGS.  18  and  19 . As shown in the drawing, a central depression  525   a ″ is formed in a central portion of the lower end of the lever  525 . A central protrusion  541   a ″ is provided on the upper end of the cylinder pipe  541 ″ of the pump and configured to be inserted into the central depression  525   a″.    
     A locking pin  560  is assembled passing through the central depression  525 ″ and the central protrusion  541   a″.    
     If the locking pin  560  is inserted into the central depression  525   a ″ and through holes  525   b ″ and  541   b ″ of the central protrusion  541   a ″, the lever  525  and the pump  540  are coupled and fastened to each other and thus integrally operated while having a linear shape. 
     The locking pin  560  includes an outer pipe  561  which is provided with a stop protrusion  561   a  on one end thereof, an operating rod  562  which is inserted into the outer pipe  561 , a spring  565  which elastically pushes the operating rod  562  outward, a locking bolt  563  which is fixed to one end of the operating rod  562  and configured to prevent the operating rod  562  from being undesirably removed from the outer pipe  561 , and a plurality of balls  564  which are inserted into respective side holes  561   b  formed in a side surface of the outer pipe  561 . 
     Particularly, when the locking pin  560  is at a locked position, a portion of each ball  564  is disposed in the corresponding side hole  561   b  of the outer pipe  561 , and another portion thereof protrudes outward from the side hole  561   b . When the locking pin  560  is at a separation position, the ball  564  is disposed in a reduced diameter part  562   a  of the operating rod  562  and thus completely inserted inside the side hole  561   b , thus allowing the locking pin  560  to be removed from the central depression  525   a ″ and the central protrusion  541   a″.    
     Referring to  FIG. 18 , there is illustrated a state in which the locking pin  560  is assembled and locked through the central hole  525   a ″ and the through holes  525   b ″ and  541   b ″ of the central protrusion  541   a ″. The locking pin  560  is in a state in which it is fixed by the balls  564  and the stop protrusion  561   a  of the outer pipe  561 . 
     In this state, if the stop protrusion  561   a  or the balls  564  are displaced from the locked position thereof, the locking pin  560  is allowed to be removed from the through holes  525   b ″ and  541   b ″. Because the stop protrusion  561   a  is a fixed part and the balls  564  are movable, whether the locking pin  560  is in the locked state or allowed to be separated is determined by movement of the balls  564 . 
     The balls  564  are assembled in the respective side holes  561   b  of the outer pipe  561 . The diameter of each ball  564  is slightly larger than that of the corresponding side hole  561   b  so that the ball  564  can be prevented from being removed out of the outer pipe  561 . 
     Referring to  FIG. 19 , there is clearly illustrated the operation of the locking pin  560 . When the user pushes the operating rod  562  of the locking pin  560  while overcoming the elastic force of the spring  565 , the operating rod  562  is moved to the left. Then, the balls  564  are disposed in the reduced diameter part  562   a  and thus completely inserted into the outer pipe  561 . Thereby, the locking pin  560  is allowed to be completely removed from the through holes  525   b ″ and  541   b″.    
     On the contrary to this, if the force applied to the operating rod  562  is removed, the balls  564  are returned to the original state of  FIG. 18  in which they protrude outward from the outer pipe  561 . 
     Although the locking pin  560  has a complex structure, it can be operated in a one-touch manner. Therefore, the locking pin  560  is preferably applied to a high-quality product that is relatively expensive. 
     Although various embodiments have been described for illustrative purposes, it will be apparent to those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the following claims. 
     INDUSTRIAL APPLICABILITY 
     The present invention can be applied to a bicycle.