JP2009220598A - Rotation drive device and bicycle provided with this - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotation drive device with a smaller number of parts and a simple structure. <P>SOLUTION: A ratchet wheel 4 is fixed to a rotation shaft 3 pivotally supported in a device body 2, and both left and right vertical frames 5, 6 of a gate-shape lifting frame body 8 comprising both the left and right vertical frames 5, 6 and a connection frame 7 are arranged at both left and right sides of the ratchet wheel 4. A spring 9 for lifting frame body ascending resetting is interposed between the connection frame 7 of the lifting frame body 8 and the device body 2. On one vertical frame 5 of the lifting frame body 8, a rack 11 comprising a rack tooth 11a engaged with a ratchet 4a of the ratchet wheel 4 at descending of the lifting frame body 8 to rotate the ratchet wheel 4 in one direction and not engaged with the ratchet 4a at ascending is provided liftably and integrally with the vertical frames 5, 6 and movably in a left/right direction approaching/leaving relative to the ratchet wheel 4. Further, on the other vertical frame 6, a rack 12 comprising a rack tooth 12a not engaged with the ratchet 4a of the ratchet wheel 4 at descending of the lifting frame body 8 and engaged with the ratchet 4a at ascending to rotate the ratchet wheel 4 in one direction is provided liftably and integrally with the vertical frames 5, 6 and movably in the left/right direction approaching/leaving relative to the ratchet wheel 4. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a rotary drive device and a bicycle equipped with the rotary drive device.

  There is a known battery-assisted bicycle that uses a battery (storage battery) to turn a motor (electric motor) to assist human power. However, it takes time to charge the battery, and it is charged frequently because the battery life is short. Need to do.

  The present invention has been made in view of the above-described problems.For example, a linear motion generated by a person riding a bicycle repeatedly sitting on the saddle and lifting the waist is converted into a rotational motion. It is an object of the present invention to provide a rotation drive device that outputs a rotation drive force, and a bicycle including the rotation drive device.

  Means for solving the above problems will be described with reference numerals in the embodiments described later. The rotary drive device according to claim 1 is configured such that the claw wheel 4 is attached to the rotary shaft 3 pivoted in the device body 2. The left and right vertical frames 5 and 6 of the portal-type lifting frame body 8 composed of the left and right vertical frames 5 and 6 and the connecting frame 7 are arranged on the left and right sides of the claw wheel 4, and the lifting frame body 8 is connected. An elevating frame body lifting / returning spring 9 is interposed between the frame 7 and the apparatus body 2, and one vertical frame 5 of the elevating frame body 8 is provided with a claw tooth 4 a of the claw wheel 4 when the elevating frame body 8 is lowered. And the claw wheel 4 is rotated in one direction, and the rack 11 composed of rack teeth 11a that do not engage with the claw teeth 4a when raised, and the other vertical frame 6 has a claw when the elevating frame body 8 is lowered. A rack 12 composed of rack teeth 12a that engage with the claw teeth 4a when turning up and rotate the claw wheels 4 in the one direction without being engaged with the claw teeth 4a of the wheel 4, The rack spring 13 is provided so that it can be moved up and down integrally with the frames 5 and 6 and is movable in the left-right direction so as to be in contact with and away from the claw wheel 4 and urges the racks 11 and 12 to always contact the claw wheel 4. If the elevating frame body 8 is pushed down against the urging force of the lifting / returning spring 9, the hook wheel 4 rotates in the one direction to rotate the rotary shaft 3 in the same direction, and the pushing force is reduced. When the lifting frame body 8 is released and lifted back by the biasing force of the spring 9, the hook wheel 4 rotates in the one direction and the rotating shaft 3 continues to rotate in the same direction, and thereafter the lifting frame body 8 moves up and down. The rotating shaft 3 is configured to continuously rotate.

  In the bicycle according to the second aspect, the device main body 2 of the rotary drive device 1 according to the first or second aspect is fixed to the standpipe 19 constituting a part of the frame 18 of the bicycle, and The lift frame 8 of the rotary drive device 1 is connected to the saddle post 20 that is slidably moved up and down through the connecting arm 21 and is connected to the rotary shaft 3 of the rotary drive device 1 in conjunction with the sprocket 22. The bicycle user meshes with the bicycle chain 23, and the bicycle user repeats the operation of putting his / her weight on the saddle 24 attached to the upper end portion of the saddle post 20 and the operation of lifting his / her waist and not putting the weight. The elevating frame body 8 of the drive device 1 is moved up and down to continuously rotate the rotating shaft 3, and the bicycle chain 23 is driven forward by the rotation of the sprocket 22. To.

  According to a third aspect of the present invention, in the bicycle according to the second aspect, the sprocket 22 is integrally attached to the rotary shaft 3 of the rotary drive device 1.

  According to a fourth aspect of the present invention, in the bicycle according to the second aspect, the sprocket 22 is rotatably attached to the rotary shaft 3 of the rotary drive device 1, and one end of a rotating lever 37 is fixed to the rotary shaft 3. Between the other end of the rotation lever 37 and the sprocket 22, a spring 40 that receives a compression action when the rotation lever 37 rotates due to the rotation of the rotary shaft 3 due to the lifting and lowering of the lifting frame body 8 is interposed. The sprocket 22 is rotated via the compression biasing force of the spring 40.

  According to a fifth aspect of the present invention, in the bicycle according to the second aspect, the sprocket 22 is rotatably attached to the rotary shaft 3 of the rotary drive device 1, and the central portion in the longitudinal direction of the rotary rod 43 is fixed to the rotary shaft 3. Between the one side of one end of the rotating rod 43 and the sprocket 22 and between the other side of the other end of the rotating rod 43 and the sprocket 22, a rotary shaft is formed by raising and lowering the lifting frame body 8. 3, springs 40 and 40 that are compressed when the turning rod 43 is rotated by the rotation of 3 are interposed, and the sprocket 22 is rotated through the compression biasing force of both the springs 40 and 40. It is characterized by.

  The effect of the invention by the above solution will be described with reference numerals in the embodiments described later. According to the rotary drive device 1 of the invention according to claim 1, the connection frame 12 of the elevating frame body 8 is periodically attached to the connection frame 12. With a simple operation that only applies a pressing force, the elevating frame 8 can be raised and lowered to continuously rotate the rotary shaft 3. In addition, since the rotational drive device 1 has a small number of parts and a simple structure, the entire device can be reduced in size and manufactured at low cost.

  According to the bicycle of the second aspect of the present invention, when the user sits down on the saddle 24 and puts his / her weight on the saddle post 20, the load applied to the saddle post 20 acts on the lifting / lowering frame body 8 of the rotary drive device 1. 8 is pushed down, the rotating shaft 3 rotates to rotate the sprocket 22 in the same direction, the chain 23 is driven in the forward direction, and when the user floats up, the load is not applied to the saddle 24. The lifting frame body 8 and the saddle post 20 return to the ascending limit position by the biasing force of the spring 14 of the driving device 1, and the rotating shaft 3 continues to rotate in the same direction when the lifting frame body 8 is lifted. To drive the chain 23 and rotate the rear wheel 29 in the forward direction of the bicycle. Therefore, this bicycle with a rotation drive device needs to be charged like a conventional battery-assisted bicycle, so it does not take time and is very economical. Further, in this bicycle with a rotation drive device, the pawl wheel 4 is mounted on the racks 11 and 12 in a state where the user sits down on the saddle 24, that is, in a state where the lifting frame body 8 of the rotation drive device 1 is not raised or lowered. On the other hand, since it can be rotated freely, it can be used as an ordinary bicycle as it is by stepping on the pedals 28 and 28 with both feet.

  As described in claim 3, the sprocket 22 can be integrally attached to the rotary shaft 3 of the rotary drive device 1.

  If the rotation lever 37 is rotated by the rotation of the rotating shaft 3 to compress the spring 40 and the sprocket 22 is rotated via the compression biasing force of the spring 40 as described in claim 4, When a large forward driving force is required for the bicycle chain 23, such as when traveling on a hill, the spring 40 is compressed and compressed by rotating the rotating shaft 3 and rotating the rotating lever 37 by moving the lifting frame 8 up and down. Since the urging force is accumulated, a large rotational torque is obtained in the sprocket 22 by the accumulated compression urging force, and the chain 23 can be driven strongly.

  According to the fifth aspect, the springs 40 and 40 are interposed between one side surface of the rotating rod 43 and the sprocket 22 and between the other side surface of the rotating rod 43 and the sprocket 22. In this case, the compression urging force accumulated in the compression spring 40 is twice that of the rotation lever 37 of claim 5, so that a large rotational torque is obtained by the sprocket 22 and the chain 23 is driven more strongly. be able to.

  A preferred embodiment of the present invention will be described below with reference to the drawings. FIG. 1 (a) is a perspective view showing a rotary drive device 1 according to the present invention, and (b) is an XX line of (a). 2 (a) is a cross-sectional view taken along line YY in FIG. 1 (a), showing a state in which the lifting frame is in the upper limit position, and FIG. 2 (b) is the same. FIG. 9 is a cross-sectional view showing a state where the lifting frame body is at the lower limit position.

  In this rotary drive device 1, a rotary shaft 3 is mounted on a bearing 10 in a device main body 2, and a claw wheel 4 is fixed to the rotary shaft 3. , 6 and the connecting frame 7, the left and right vertical frames 5, 6 of the portal elevating frame body 8 are arranged, and the elevating frame body is raised and returned between the connecting frame 7 of the elevating frame body 8 and the apparatus body 2. A spring 9 is interposed, and one vertical frame 5 of the elevating frame body 8 is engaged with the claw teeth 4a of the claw wheel 4 when the elevating frame body 8 is lowered so that the claw wheel 4 is, for example, shown in FIG. The rack 11 is formed of rack teeth 11a that do not engage with the claw teeth 4a of the ratchet wheel 4 when raised, and the other vertical frame 6 has a claw when the lifting frame body 8 is lowered. A rack 12 composed of rack teeth 12a that engage with the claw teeth 4a when turning up and rotate the claw wheels 4 in the clockwise direction A without being engaged with the claw teeth 4a of the wheel 4 is A rack spring 13 is provided which can be moved up and down integrally with 5 and 6 and is movable in the left and right direction so as to be in contact with and away from the claw wheel 4 and urges the racks 11 and 12 to always contact the claw wheel 4. When the elevating frame body 8 is pushed down against the urging force of the ascending / returning spring 9, the hook wheel 4 rotates in the clockwise direction A and rotates the rotating shaft 3 in the same direction. When the push-down force is released and the lifting frame 8 is lifted and returned by the biasing force of the lifting return spring 9, the hook wheel 4 rotates in the clockwise direction A to continuously rotate the rotary shaft 3 in the same direction. As the frame body 8 moves up and down, the rotating shaft 3 rotates continuously.

  The configuration of the rotary drive device 1 will be described in more detail. As shown in FIGS. 2 (a) and 2 (b), the vertical frame 5 of the gate-shaped lifting frame body 8 has a lower inner surface (claw wheel 4). A recess 14 is formed at a predetermined depth d on the side surface (closer to the side), and the rack 11 having a thickness t of, for example, about 2/3 of the depth d of the recess 14 is vertically And the rear wall surface (bottom surface) of the recess 14 are fitted so as to be movable in the left-right direction (the depth d direction of the recess 14) that is immovable in the direction and the front-rear direction and that moves toward and away from the claw wheel 4. Between the back surface of the rack 11, a plurality of rack springs 13 that urge the rack 11 to the side always in contact with the claw wheel 4 are interposed.

  The vertical frame 6 of the gate-shaped lifting frame body 8 is the same, and a recess 14 is formed at a predetermined depth d on the inner surface on the lower side, and the rack 12 having a thickness t is provided in the recess 14. It is fitted in such a manner that it cannot move in the vertical direction and the front-rear direction, and can move in the left-right direction that is in contact with and away from the claw wheel 4. A plurality of rack springs 13 that urge the rack 12 toward the side that always contacts the claw wheel 4 are interposed.

  The lifting and lowering frame body spring 9 is composed of a compression coil spring interposed between the upper surface 2 a of the apparatus body 2 and the connecting frame 7 of the lifting and lowering frame body 8. The body 8 is returned to the ascending limit position. In this case, an ascent limit position limiting stopper 16 is provided so that the elevating frame body 8 does not protrude beyond the ascent limit position. The stopper 16 is made of a bolt, and the bolt 16 is inserted into bolt insertion holes 17 provided at both ends of the connecting frame 12 of the elevating frame body 8, and the lower end screw portion 17b is screwed into the apparatus main body 2. Thus, the head 16 a of the bolt 16 is engaged with the connecting frame 7 of the elevating frame body 8 at the ascending limit position of the elevating frame body 8.

  In the use of the rotary drive device 1 having the above-described configuration, when the connecting frame 7 of the elevating frame body 8 is pushed down against the urging force of the coil spring 9 from the state shown in FIG. Since the rack teeth 11a of the rack 11 are engaged with the claw teeth 4a of the claw wheel 4, the claw wheel 4 is rotated in the clockwise direction indicated by the arrow A in FIG. Are rotated in the same clockwise direction A. At this time, the rack teeth 12a of the rack 12 on the vertical frame 6 side do not engage with the claw teeth 4a of the ratchet wheel 4, and only slide. When the rack teeth 11a and 12a of the racks 11 and 12 are engaged with the claw teeth 4a of the claw wheel 4 or slides, the racks 11 and 12 resist the urging force of the rack spring 13 and the claw wheel. A slight shift in the direction away from 4.

  After the elevating frame body 8 is lowered to the lower limit position in this way, when the pressing force on the elevating frame body 8 is released, the elevating frame body 8 is raised by the urging force of the coil spring 9. The rack teeth 11 a of the rack 11 do not engage with the claw teeth 4 a of the claw wheel 4, but only slide, and the rack 12 on the vertical frame 6 side engages with the claw teeth 4 a of the claw wheel 4. Therefore, the upward movement of the vertical frame 6 causes the ratchet wheel 4 to rotate in the clockwise direction indicated by the arrow A in FIG. 2, and the rotation shaft 3 continues to rotate in the clockwise direction A.

  Therefore, the rotary shaft 3 can be continuously rotated by repeatedly performing the lifting and lowering operation of the lifting frame body 8 as described above. That is, the rotational drive device 1 continuously rotates the rotary shaft 3 by the vertical movement of the lifting frame 8 by the racks 11 and 12 of the left and right vertical frames 5 and 6 and the claw wheel 4 fixed to the rotary shaft 3. A motion conversion mechanism for converting to a rotational motion is configured.

  The rotation drive device 1 is characterized in that the rotary shaft 3 can be freely rotated in a certain direction when the lift frame body 8 is not raised and lowered and is stationary. That is, in the state shown in FIG. 2 (a) or (b), if the rotary shaft 3 is now rotated in the direction shown by the arrow A in FIG. , 12 are not engaged with the rack teeth 11a, 12a, and are moved away from the claw wheel 4 via the rack spring 13, so that the claw wheel 4 is free to rotate in the direction of arrow A with respect to the racks 11, 12 on both sides. Therefore, the rotary shaft 3 can be freely rotated in the direction of the arrow A.

  According to the rotational drive device 1 as described above, the rotary shaft 3 is continuously moved up and down by a simple operation that only applies a pressing force to the connecting frame 7 of the lift frame body 8 periodically. Can be rotated. In addition, since the rotational drive device 1 has a small number of parts and a simple structure, the entire device can be reduced in size and manufactured at low cost.

  FIG. 3 (a) shows a bicycle equipped with the rotary drive device 1, and the bicycle user repeatedly puts the weight on the saddle 24 and removes it from the saddle 24. By moving 8 up and down, the rotating shaft 3 is continuously rotated to drive the bicycle chain 23 forward, thereby assisting human power.

  In order to install the rotary drive device 1 on a bicycle, the main body 2 of the rotary drive device 1 is placed on the back side of a rectangular tube-like standing tube (also called a seat tube) 19 constituting a part of the diamond frame 18 of the bicycle. Is attached and fixed by a clamp 25, and the elevating frame body 8 is interlocked and connected to a square cylindrical saddle post 20 inserted into the vertical pipe 19 so as to be slidable upward and downward via a connecting arm 21. The sprocket 22 that is coaxially attached to the rotary shaft 3 and can be integrally rotated is meshed with the chain 23 of the bicycle, so that the bicycle user can connect the saddle 24 attached to the upper end of the saddle post 20 to the saddle 24. By repeatedly raising and lowering the lifting and lowering frame body 8 by repeatedly performing the action of lowering the waist and applying weight and the action of lifting the waist and not applying weight, the rotating shaft 3 is rotated continuously. By it is obtained by so as to advance drive the bicycle chain 23 by the rotation of the sprocket 22. When the bicycle is not in use, the elevating frame 8 of the rotary drive device 1 is in the ascending limit position.

  As shown in FIG. 3 (b), sliding members 26 are respectively attached to the four side surfaces of the square cylindrical saddle post 20 at two upper and lower portions, and the saddle post 20 is raised and lowered in the vertical pipe 19. Can be done smoothly. In addition, the connecting arm 21 has a base end portion that projects into the lower end side of the saddle post 20 and is integrally fixed so as to be perpendicular to the saddle post 20. It slides up and down along the guide groove 27 formed in the side wall. The distal end portion of the connecting arm 21 is connected and fixed to the connecting frame 12 of the elevating frame body 8.

  In the use of this bicycle, the user straddles the saddle 24 and puts both feet on the pedals 28 and 28, and puts his / her weight on the saddle 24 and lifts his / her waist and does not put the weight. By alternately raising and lowering the elevating frame body 8 by alternately performing the operation, the rotating shaft 3 can be continuously rotated and the chain 23 of the bicycle can be driven forward by the rotation of the sprocket 22.

  That is, when the user sits on the saddle 24 and puts his / her weight on the saddle post 20, the load applied to the saddle post 20 acts on the lifting / lowering frame body 8 of the rotary drive device 1 via the connecting arm 21 to push down the lifting / lowering frame body 8. The rotating shaft 3 rotates in the direction of the arrow shown in FIG. 3 (b) to rotate the sprocket 22 in the direction of the arrow in the figure, drives the chain 23 in the direction of the arrow in the figure, and moves the rear wheel 29 in the bicycle forward direction. When the user rotates and the user floats, no load is applied to the saddle 24. Therefore, the lifting frame body 8 and the saddle post 20 are returned to the ascending limit position by the urging force of the coil spring 14 of the rotary driving device 1, and the lifting and lowering is performed. Since the rotating shaft 3 continues to rotate in the same direction when the frame body 8 is raised, the sprocket 22 is rotated to drive the chain 23 and rotate the rear wheel 29 in the bicycle forward direction.

  Further, in this bicycle, when the user sits down on the saddle 24, that is, when the lifting frame 8 of the rotary drive device 1 is not raised or lowered, the ratchet wheel 4 rotates the rotating shaft 3 in the bicycle forward direction. Since it becomes free with respect to the racks 11 and 12 and is separated from the rotary drive device 1, the pedals 28 and 28 can be stepped on with both feet and used as is as an ordinary bicycle.

  In addition, the user steps on the pedal 28 with both feet and drives the chain 23 with the pedaling force, repeatedly performing the operation of sitting down and floating on the saddle 24 as described above to rotate the rotating shaft 3. Thus, the sprocket 22 may be rotated to apply a driving force to the chain 23. By doing so, a large chain driving force can be obtained with a relatively small pedal effort, and the vehicle can travel easily on a slope. In FIG. 3, 30 is a front wheel, 31 is a handle frame, 32 is an upper tube of the diamond frame 18, 33 is a lower tube, 34 is a head tube, and 35 is a chain stay.

  In the bicycle described with reference to FIG. 3 (a), a sprocket 22 is attached to the rotary shaft 3 of the rotary drive device 1 so as to be rotatable integrally with the rotary shaft 3, and the sprocket 22 is directly rotated by the rotation of the rotary shaft 3. The embodiment of the chain mechanism has been shown. In FIGS. 4A and 4B, the sprocket 22 is rotatably attached to the rotary shaft 3 of the rotary drive device 1 via the bearing 36, and the rotary shaft thereof. 3, one end portion of the rotation lever 37 is fixed. Between the other end portion of the rotation lever 37 and a spring mounting piece 39 attached to the sprocket 22 with a fixing bolt 38, the lifting frame body 8 is fixed. A compression coil spring 40 that receives a compression action when the rotation lever 37 is rotated by the rotation of the rotary shaft 3 by raising and lowering is interposed, and the sprocket 22 is rotated by the compression biasing force of the coil spring 40. It illustrates an embodiment of a sprocket chain mechanism which is adapted to drive the chain 23 in the forward direction by the rotation of the sprocket 22. In order to fix one end of the rotation lever 37 to the rotary shaft 3, a shaft insertion hole 41 provided at one end of the rotation lever 37 is inserted into the rotation shaft 3, and the rotation shaft 3 and the shaft insertion hole 41 are connected. What is necessary is just to insert the key 42 in between.

  As in the embodiment shown in FIGS. 4A and 4B, the rotating lever 37 is rotated by the rotation of the rotating shaft 3 to compress the compression coil spring 40, and the compression biasing force of the coil spring 40 is used. When the sprocket 22 is rotated, when a large forward drive force is required for the bicycle chain 23, such as when traveling on a hill, the rotating shaft 3 is rotated by the lifting and lowering of the lifting and lowering frame body 8, and the rotating lever 37 is moved. By rotating, the coil spring 40 is compressed and accumulates a compression urging force, so that the accumulated compression urging force provides a large rotational torque to the sprocket 22 and can drive the chain 23 strongly.

  Further, in FIG. 5, the sprocket 22 is rotatably attached to the rotary shaft 3 of the rotary drive device 1, and a central portion in the longitudinal direction of the rotary rod 43 is fixed to the rotary shaft 3. Between one side of one end and a spring mounting piece 39 attached to the sprocket 22 with a fixing bolt 38, and to the other side of the other end of the rotary rod 43 and a spring mounting piece 39 attached to the sprocket 22 with a fixing bolt 38 In between, compression coil springs 40, 40 that receive a compression action when the rotary rod 43 is rotated by the rotation of the rotary shaft 3 by the lifting and lowering of the lifting frame body 8 are interposed, respectively. A sprocket / chain mechanism is shown in which a sprocket 22 is rotated via a compression urging force, and the chain 23 is driven in the forward direction by the rotation of the sprocket 22.

  Like the sprocket / chain mechanism shown in FIG. 5, a compression spring is provided between one side of one end of the rotary rod 43 and the sprocket 22 and between the other side of the other end of the rotary rod 43 and the sprocket 22. When 40 and 40 are respectively inserted, the compression urging force accumulated by the compression spring 40 is twice that in the case of FIGS. 4A and 4B, so that a larger rotational torque can be obtained in the sprocket 22. The chain 23 can be driven more powerfully.

(a) is a perspective view which shows the rotational drive apparatus based on this invention, (b) is XX sectional drawing of (a). (a) is a cross-sectional view taken along line YY in FIG. 1 (a), showing a state in which the elevating frame body is at the upper limit position, and (b) is a similar cross-sectional view in which the elevating frame body is The state in the lower limit position is shown. (a) is a side view showing a bicycle with a rotary drive device according to the present invention, (b) is an enlarged sectional view taken along line ZZ of (a). (a) is the front view which shows embodiment of a sprocket chain mechanism, (b) is the VV sectional view taken on the line of (a). It is a front view which shows embodiment of another sprocket chain mechanism.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Rotation drive apparatus 2 Apparatus main body 3 Rotating shaft 4 Claw wheel 5, 6 Vertical frame 7 Connection frame 8 Lifting frame body 9 Lifting frame body raising return spring 11, 12 Rack 11a, 12a Rack tooth 13 Rack spring 14 Recess 18 Bicycle frame 19 Frame standpipe 20 Saddle post 21 Connecting arm 22 Sprocket 23 Chain 24 Saddle

Claims (5)

  The ratchet wheel is fixed to the rotating shaft pivoted in the main body of the apparatus, and the left and right vertical frames of the gate-type lifting frame body composed of the left and right vertical frames and the connecting frame are arranged on the left and right sides of the ratchet wheel. An elevating frame body lifting return spring is interposed between the body connecting frame and the apparatus main body, and one vertical frame of the elevating frame body is engaged with the claw teeth of the ratchet wheel when the elevating frame body is lowered. Rotate the claw wheel in one direction, and when it is raised, the rack is made up of rack teeth that do not engage with the claw teeth, and the other vertical frame does not engage with the claw teeth of the claw wheel when the elevating frame body is lowered. A rack composed of rack teeth that engage with the claw teeth and rotate the claw wheel in the one direction is provided so as to be able to move up and down integrally with the vertical frame and move in the left and right directions contacting and leaving the claw wheel. A rack spring that urges the rack to the side that is always in contact with the claw wheel is provided, and the lifting frame body is pushed down against the urging force of the lifting return spring. When the ratchet wheel rotates in the one direction and rotates the rotation shaft in the same direction, the push-down force is released, and when the lifting frame body is lifted and returned by the biasing force of the spring, the hook wheel rotates in the one direction. The rotation drive device is configured such that the rotation shaft is continuously rotated in the same direction and the rotation frame is subsequently moved up and down so that the rotation shaft continuously rotates.   The apparatus main body of the rotary drive device according to claim 1 is fixed to a vertical pipe that constitutes a part of a bicycle frame, and is rotated through a connecting arm on a saddle post that is slidably inserted into the vertical pipe from above. The lifting frame of the drive unit is connected to be movable up and down, and the sprocket linked to the rotation shaft of the rotary drive unit is engaged with the bicycle chain so that the bicycle user can sit on the saddle attached to the upper end of the saddle post. Rotate the rotating shaft continuously by lifting and lowering the lifting frame of the rotation drive device by repeating the operation of lifting the weight and lifting the weight and the operation of lifting the weight and not lifting the weight. A bicycle that drives the chain forward.   The bicycle according to claim 2, wherein the sprocket is integrally attached to a rotation shaft of a rotation drive device.   The sprocket is rotatably attached to a rotating shaft of a rotary drive device, and one end of a rotating lever is fixed to the rotating shaft, and the lifting frame body is between the other end of the rotating lever and the sprocket. The bicycle according to claim 2, further comprising a spring that receives a compression action when the rotation lever is rotated by rotation of the rotation shaft by raising and lowering the rocket, and the sprocket is rotated by a compression biasing force of the spring. .   The sprocket is rotatably attached to the rotation shaft of the rotary drive device, and the central portion in the longitudinal direction of the rotary rod is fixed to the rotary shaft. Between the other side surface of the other end of the moving rod and the sprocket, springs that receive a compression action when the rotating rod is rotated by the rotation of the rotating shaft due to the lifting and lowering of the lifting frame body are interposed, respectively. The bicycle according to claim 2, wherein the sprocket is rotated via a compression biasing force of both springs.

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