JP5213597B2 - Tricycle - Google Patents

Description

  The present invention relates to a tricycle having left and right front wheels and rear wheels.

  In general, a bicycle is provided with cranks having pedals on both the left and right ends of the crankshaft, the crankshaft is rotated through the crank, and the drive sprocket provided on the crankshaft is rotated to rotate the chain. The driven sprocket provided on the rear wheel hub is rotated, and the rear wheel is rotated to travel forward.

  By the way, the bicycle can rotate the crankshaft continuously via the crank and has high exercise efficiency, but it is necessary to place the front wheel at a position that does not interfere with the circular movement of the crank, and the wheelbase is inevitable And the rear wheel diameter increases. For this reason, when a normal bicycle passes on a sidewalk under a sign dedicated to bicycles and pedestrians, the overall length is too large to travel around the crowd, about 190 cm, and two wheels when traveling at low speed. There is a risk of instability, and there is a risk of falling and damaging the steering wheel to avoid danger. In addition, when traveling, the upper body is leaning forward and the line of sight is moving forward and downward, so the front of the front wheels is slightly seen. For this reason, in response to an unexpected behavior change such as a pedestrian in front of the bicycle, there is a possibility that it may be delayed. Further, the drive system in which the crank is rotated by stepping on the pedal with both feet always has a drawback that it is not interesting.

  In a cycle center or the like, the left and right pedals are alternately depressed to reciprocate the left and right cranks over a certain angular range, so that the crankshaft is rotated and the driven sprocket is moved via the drive sprocket and chain provided on the crankshaft. There is also known a variant bicycle that rotates and rotates the rear wheel to run forward, but in order to reciprocate the left and right cranks up and down alternately, it is necessary to swing the body alternately left and right and move the weight It lacks stability and has a large exercise load, making it difficult to use for a long time. In addition, since the crank cannot be reciprocated beyond a certain angle range, the rear wheel cannot be rotated in the backward direction together with the driven sprocket to change the front-rear direction as in a normal bicycle. Accordingly, when changing the direction in the front-rear direction on a narrow road or the like, it is necessary to lift the whole bicycle and change the direction, and there is a problem that the direction cannot be changed easily.

  The present invention has been made in view of such problems, and is formed in a compact size, can easily change the front and rear direction, and can stably turn a road or the like with its line of sight facing away. The present invention provides a tricycle that can travel.

  The present invention relates to a frame having a head pipe and a footrest that rotatably supports a handle post having a handle bar about a substantially vertical axis, and left and right front wheels rotatably supported on the front portion of the frame, and A rear wheel rotatably supported at the rear, a first crankshaft and a second crankshaft rotatably supported about a horizontal axis spaced apart from each other in the front-rear direction, and a first crank A drive sprocket fixed to one end of the shaft and a sprocket fixed to the other end, a kick lever fixed to one end of the second clan shaft, and a pedal rotatably supported at the tip and the other end And a first chain wound between a driven sprocket and a drive sprocket provided on a hub of a rear wheel One end is fixed to the rear part of the frame, and it consists of a movable sprocket, a second chain wound around the sprocket and the other end fixed to the front part of the frame via a spring. The spring is extended by depressing the kick lever. The second chain is moved to rotate the sprocket, and the rear wheel is rotated via the drive sprocket, the first chain and the driven sprocket.

  According to the present invention, by placing one foot on the footrest and depressing the kick lever with the other foot, the second crankshaft and the crank arm connected to the second crankshaft are rotated. When the crank arm rotates, the movable sprocket provided on the crank arm also rotates, and the spring is stretched against the urging force via the second chain that winds the movable sprocket. Move the second chain. When the second chain moves, the sprocket and the movable sprocket around which the second chain is wound are rotated, and the first crankshaft to which the sprocket is connected and the drive sprocket connected to the first crankshaft are sequentially rotated. Let If the drive sprocket rotates, the rear wheel rotates through the first chain and the driven sprocket and travels forward.

  At this time, the movable sprocket provided on the crank arm also rotates with the rotation of the crank arm, thereby pulling and moving the second chain by a distance that is twice the distance corresponding to the rotation of the movable sprocket. . Therefore, even if the rotation angle of the kick lever is small, the amount of movement of the second chain can be amplified and the sprocket can be rotated, and the rear wheel can be sufficiently rotated to travel.

  On the other hand, when the depression of the kick lever is completed and the foot is released from the pedal, the spring pulls and moves the second chain by the distance extended by the biasing force. When the second chain moves, the sprocket and the movable sprocket around which the second chain is wound are rotated in the reverse direction, and the crank arm is rotated in the reverse direction via the rotating movable sprocket. When the sprocket rotates, the first crankshaft and the drive sprocket rotate in the same direction, causing the first chain to move around and rotate the driven sprocket in the direction opposite to the forward direction. In this case, since the rear wheel hub is free to rotate in the backward direction, the rear wheel does not rotate. Further, the rotation of the crank arm rotates the first crankshaft and the kick lever to their original positions.

  Further, after the head pipe is pushed forward to raise the rear wheel, the other front wheel can be turned 180 degrees around one of the left and right front wheels to change the front-rear direction. For this reason, the front-rear direction can be easily changed even on a narrow road.

  As a result, since the user can travel in a substantially vertical standing posture, the user can observe far away with the line of sight substantially parallel to the ground, and can grasp an unexpected situation ahead. Moreover, since it is a compact size compared with a normal bicycle, it can run lightly even in crowds, and since it is a three-wheeler, it can run stably without falling down. Furthermore, the front-rear direction can be easily changed even on a narrow road.

  In the present invention, it is preferable that a contact member capable of contacting the frame is provided at a tip of the crank arm. As a result, when the second chain is pulled and moved by the distance stretched by the urging force of the spring, and the crank arm is rotated via the movable sprocket that is wound and rotated, the contact member Can be pushed against the frame to prevent further rotation.

  In the present invention, it is preferable that the second chain is wound around a guide sprocket rotatably supported by a connecting member that supports the footrest and the other end is connected to a spring. As a result, the second chain is wound below the footrest and connected to the spring, so that the spring can be sufficiently extended without interfering with the crank arm.

  In the present invention, the frame includes a front frame having guide posts that are substantially vertical at both ends, and a head pipe that is connected to the front frame so as to be rotatable about a substantially horizontal axis having an axial center in the front-rear direction. The left and right mounting brackets, which are composed of a frame and pivotally support the left and right front wheels, are rotatably supported on each guide post via a pivot shaft, and are interlocked via a handle post, a steering rod and a tuning rod. It is preferable that the head pipe is held in a substantially vertical state with respect to the front frame via a holding spring. As a result, when the handlebar is rotated to the left or right during traveling, the handle post rotates around the head pipe, and one mounting bracket is pulled or pushed via the steering rod. The pivot shaft is rotated counterclockwise or clockwise around one guide post. At the same time, the other mounting bracket is pushed or pulled through the tuning rod, and the pivot shaft of the other mounting bracket is rotated counterclockwise or clockwise around the other guide post. Accordingly, the left and right mounting brackets, that is, the left and right front wheels are directed in the same direction as the rotation direction of the handlebar, and can be steered leftward or rightward.

  At this time, the user can tilt the head pipe to the left or right around the axis provided in the front frame in accordance with the steering direction, and can easily change the course to the left or right. The head pipe that is tilted to the left or right is returned to and held in the substantially vertical position by the urging force of the holding spring.

  In the present invention, it is preferable that the head pipe is fixed via a fixed frame that is detachable from the front frame. As a result, the head pipe can be prevented from falling to the left or right unintentionally, and a beginner can travel without feeling uneasy. Once you get used to running, you can remove the fixed frame and turn the headpipe to change direction.

  According to the present invention, it is formed in a compact size as compared with a normal bicycle, can easily change the front-rear direction, and can stably travel on a road or the like with its line of sight facing away. .

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  1 to 4 show an embodiment of the tricycle 1 of the present invention.

  The tricycle 1 includes a frame 2, a left and right front wheel WF that is rotatably supported at the front portion of the frame 2, a rear wheel WR that is rotatably supported at the rear portion, a steering mechanism 3 for the front wheel WF, It is comprised from the drive mechanism 4 of the wheel WR.

  The frame 2 has a front frame 21 to which a guide post 22 having a substantially vertical axis is fixed at each of the left and right ends, and a downwardly inclined axis at the middle in the left-right direction of the front frame 21 toward the rear. The main frame 23 integrally includes a substantially T-shaped connection pipe 24a rotatably connected to the shaft 21a of the front frame 21. The main frame 23 is rotatably connected around the fixed shaft 21a. The head pipe 24 erected substantially vertically, the upper pipe 25 and the lower pipe 26 connected to the top and bottom of the head pipe 24 and extending rearward, and connected to the lower pipe 26 so as to sandwich the rear wheel WR. The left and right chain stays 27 are connected to each other and the rear end of the upper pipe 25 is connected to the rear end of the chain stay 27 so as to sandwich the rear wheel WR from the left and right. And it has left and right ends of the axle which rotatably supports the hub of the rear wheel WR at a rear end coupling portion of the chain stays 27 and the rear stay 28 are connected. A footrest 29 is fixed to the lower pipe 26 of the main frame 23 via a connecting member 291 extending leftward. Also, left and right springs 241 having the same urging force are disposed between the front frame 21 and the connecting pipe 24a of the head pipe 24, and hold the head pipe 24 so as to stand substantially vertically. ing.

  In addition, the shaft center of the shaft 21a provided in the front frame 21 has a downward slope toward the rear, and the extension line is set so as to be in contact with the outer peripheral surface in front of the ground contact portion of the rear wheel WR. Therefore, as will be described later, even if the head pipe 24 is rotated around the shaft 21a via the handle bar 31 and tilted to the left and right, the rear wheel WR also follows and tilts at substantially the same angle in the left-right direction. .

  As shown in FIG. 3, the steering mechanism 3 is rotatably supported by the head pipe 24, and is rotatably supported by a handle post 32 having a handle bar 31 and each guide post 22 of the front frame 21. A mounting bracket 34 having a pivot 33, a tuning rod 35 connected between the left and right mounting brackets 34, a lever 321 fixed to the lower end of the handle post 32, and a steering rod connected between the right mounting bracket 34 36, and the left and right mounting brackets 34 are connected to axles that rotatably support the hubs of the left and right front wheels WF, respectively.

  The steering rod 36 is connected to the lever 321 of the handle post 32 via a ball joint (not shown), and the connection pipe 24a of the head pipe 24 around the shaft 21a of the front frame 21 falls in the left-right direction (turns). Motion).

  Therefore, by grasping both ends of the handle bar 31 and performing a rotation operation, the handle post 32 can be rotated around the head pipe 24 and the steering rod 36 can be pulled or pushed via the lever 321. When the steering rod 36 moves, the right turning shaft 33 is rotated with respect to the guide post 22 in the same direction as the rotation direction of the handle post 32 via the right mounting bracket 34 to which the steering rod 36 is connected. . At this time, the left and right mounting brackets 34 are connected by the tuning rod 35, and the left turning shaft 33 also rotates by the same angle in the same direction, so that the direction of the front wheel WF can be changed.

  As shown in FIG. 4, the drive mechanism 4 includes a first crankshaft 41 that is pivotally supported by the lower frame 26 of the main frame 23 at intervals in the front-rear direction so as to be rotatable in the horizontal direction of the left and right. The second crankshaft 42, the drive sprocket 43 integrally fixed to the right end portion of the first crankshaft 41, the sprocket 44 integrally fixed to the left end portion, and the hub of the rear wheel WR are integrally fixed. The driven sprocket 431, the first chain 432 wound between the drive sprocket 43 and the driven sprocket 431, and the right end portion of the second crankshaft 42 are integrally fixed, and a pedal 451 is provided at the tip. A kick lever 45 that is rotatably supported and a crank arm 46 that is integrally fixed to the left end and a movable sprocket 441 is rotatably supported at the tip, and a foot A guide sprocket 442 rotatably supported by a connecting member 291 that supports the rack 29, one end fixed to the rear stay 28, a movable sprocket 441 provided on the crank arm 46, and a first crankshaft 41 A sprocket 44 provided on the connecting pipe 291 and a guide sprocket 442 provided on the connecting pipe 291 are wound in order, and then a second chain 444 having the other end connected to a spring 443 fixed to the connecting pipe 24a. ing. A contact member 461 is fixed to the tip of the crank arm 46. In FIG. 4, the second chain 444 is pulled by the urging force of the spring 443, and the crank arm 46 is counterclockwise via the movable sprocket 441. When rotating in the turning direction, the contact member 461 abuts against the boss of the lower frame 26 that supports the first crankshaft 41, and the crank arm 46 is restricted from rotating further. Further, as shown in FIGS. 1 and 2, the drive sprocket 43, the first chain 432, and the driven sprocket 431 are covered by the cover 47 with the second chain 444 secured to the rear stay 28 via the sprocket 44 and the sprocket 44. The end portions are respectively covered with a cover 471, and biting of clothing or the like is prevented.

  Therefore, when the foot is stepped on the pedal 451 and the kick lever 45 is rotated downward, the second crankshaft 42 and the crank arm 46 connected to the second crankshaft 42 are clockwise in FIG. To the same angle. As a result, the movable sprocket 441 provided on the crank arm 46 extends the spring 443 against the urging force via the second chain 444, and the second chain 444 is guided by the distance that the spring 443 is extended to the sprocket 44 and the guide. By pulling and moving through the sprocket 442, the sprocket 44 is rotated counterclockwise in FIG. When the sprocket 44 rotates, the first crankshaft 41 connected to the sprocket 44 and the drive sprocket 43 connected to the first crankshaft 41 are rotated in the same direction by the same angle. The rotation of the drive sprocket 43 causes the first chain 432 to move around, so that the rear wheel WR is rotated in the same direction by a certain angle via the driven sprocket 431 and the hub to which the driven sprocket 431 is fixed.

  Here, since the movable sprocket 441 provided on the crank arm 46 rotates around the axis of the second crankshaft 42, the second chain 444 wound around the movable sprocket 441 is rotated by the crank arm 46. The second chain 444 can be amplified and moved even when the movement amount corresponding to the movement angle is twice as long as the movement angle and the rotation angle of the kick lever 45 is small. It is possible to travel a sufficient length by stepping on.

  When the foot is released from the pedal 451 of the kick lever 45 to release the pedal, the second chain 444 is pulled by the urging force of the stretched spring 443. In FIG. 4, the sprocket 44 is rotated clockwise through the guide sprocket 442. On the other hand, the movable sprocket 441 is rotated counterclockwise, and the crank arm 46 is rotated counterclockwise via the movable sprocket 46. Then, the second crankshaft 42 connected to the crank arm 46 and the kick lever 45 connected to the second crankshaft 42 are rotated in the same direction. The rotation of the crank arm 46 and the kick lever 45 stops when the contact member 461 hits the lower frame 26 of the main frame 23. In this case, when the sprocket 44 rotates in the clockwise direction, the drive sprocket 43 rotates in the same direction, and the driven sprocket 431 also rotates in the same direction via the first chain 432, but the driven sprocket 431 is provided. Although the hub of the rear wheel WR is not shown in detail, a free wheel is incorporated in the same way as the rear wheel of a normal bicycle, and the clockwise rotation on the reverse side rotates freely with respect to the axle. It is.

  Although not shown in detail, on the right side of the rear end connecting portion of the chain stay 27 and the rear stay 28 that connect the axle of the rear wheel WR, when the kick lever 45 is depressed via the pedal 451, the pedal 451 is A support member for the kick lever 45 is provided in order to support at the substantially same height as the cradle 29. Accordingly, the pedal 451 can be supported at an arbitrary rotational position with respect to the kick lever 45 without contacting the ground. Accordingly, when traveling, the left foot is placed on the footrest 29, the right foot is placed on the pedal 451 having a rotation angle suitable for the body, and the weight of the user is supported almost equally, and the depression of the pedal 451 is interrupted. You can rest.

  On the other hand, as is well known, a brake unit 51 (see FIG. 2) is provided at the left end portion of the hub of the rear wheel WR, and a brake lever 52 provided rotatably on the handlebar 31 is provided. The other end of the brake cable 53 connected at one end is connected to the lever of the brake unit 51. Therefore, if the brake lever 52 is grasped, the brake cable 53 can pull the lever of the brake unit 51 and brake the rotation of the hub, that is, the rotation of the rear wheel WR.

  This tricycle 1 is formed in a compact size as compared with a normal bicycle, specifically, a diameter of 35 cm, a total length of 75 cm, a width of 68 cm, and a height of 100 cm of the left and right front wheels WF and rear wheels WR. The vehicle can travel at a speed of approximately 12 km / h.

  Next, the case where it travels with the tricycle 1 comprised in this way is demonstrated.

  The user puts the left foot on the footrest 29, grasps both ends of the handlebar 31 with both hands, and straddles the right foot on the pedal 451 of the kick lever 45 across the rear wheel WR.

  As a result, the second crankshaft 42 to which the kick lever 45 is connected, the crank arm 46 connected to the second crankshaft 42, and the crank arm 46 from the position where the contact member 461 contacts and contacts the lower frame 26. 4, the movable sprocket 441 pivotally supported at the tip end of FIG. 4 rotates in the clockwise direction by an angle corresponding to the rotation angle of the kick lever 45. When the crank arm 46 pivotally supported by the movable sprocket 441 is rotated, a spring 443 that is twice the length corresponding to the rotation angle of the movable sprocket 441 is extended against the urging force, and one end is attached to the rear stay 28. The fixed second chain 443 is pulled through the guide sprocket 442 and the sprocket 44 and moved. For this reason, in FIG. 4, the guide sprocket 442 and the sprocket 44 are rotated counterclockwise as the second chain 444 moves, and the movable sprocket 441 is rotated clockwise. When the sprocket 44 rotates, the first crankshaft 41 to which the sprocket 44 is connected and the drive sprocket 43 connected to the right end portion of the first crankshaft 41 are set in the same direction as the rotation direction of the sprocket 44 and the rotation angle. Rotate the same angle as. When the drive sprocket 43 is rotated, the first chain 432 is moved to rotate, the driven sprocket 431 is decelerated and rotated, and the rear wheel WR is rotated via the hub provided with the driven sprocket 431, so that the vehicle can travel forward.

  At this time, the movable sprocket 441 pulls and moves the second chain 443 that is twice the length corresponding to the rotation angle around the axis of the second crankshaft 42. Even if the rotation angle is small, the second chain 443 can be moved greatly to rotate the driving sprocket 43 through the sprocket 44 and the first crankshaft 41, and the driving sprocket 43 and the driven sprocket 431 can be rotated. In combination with the reduction ratio, the rear wheel WR can be greatly rotated to travel forward a sufficient distance.

  On the other hand, when the depression of the kick lever 45 is completed and the right foot is released from the pedal 451, the second chain 444 is moved back by the length extended by the urging force of the spring 443, and in the process, the guide sprocket 442 is moved. In addition, the sprocket 44 is rotated, and the crank arm 46 is rotated about the axis of the second crankshaft 42 via the movable sprocket 441 in a direction opposite to the rotation direction when the kick lever 45 is depressed. In FIG. 4, the movable sprocket 441 supported by the crank arm 46 is rotated in the counterclockwise direction. Here, in FIG. 4, when the sprocket 44 rotates in the clockwise direction, the first crankshaft 41 and the drive sprocket 43 rotate in the same direction, and the first chain 432 is moved around to move the driven sprocket 431 forward. Rotate in the opposite direction. In this case, since the rear wheel WR is free to rotate in the reverse direction, the rear wheel WR does not rotate. In FIG. 4, the rotation of the crank arm 46 in the counterclockwise direction causes the first crankshaft 41 and the kick lever 45 to rotate in the same direction. The rotation of the kick lever 45 stops when the contact member 461 provided on the crank arm 46 hits the lower frame 26.

  Hereinafter, similarly, the tricycle 1 is moved forward by repeatedly depressing the kick lever 45 via the pedal 451 to rotate the second crankshaft 42 and then releasing the foot to return to the original position. Can be made.

  On the other hand, when the handlebar 31 is rotated to the left and right when the tricycle 1 is traveling, the handle post 32 is rotated around the head post 24 and the lever 321 fixed to the handle post 32 is rotated to rotate the steering rod. The right mounting bracket 34 is pulled or pushed through 36. As a result, the turning shaft 33 provided on the right mounting bracket 34 is rotated counterclockwise or clockwise around the right guide post 22. At the same time, the left mounting bracket 34 is pushed or pulled via the tuning rod 35, and the swivel shaft 33 provided on the left mounting bracket 34 is rotated counterclockwise around the left guide post 22 or Rotate clockwise.

  As a result, since the front end sides of the left and right mounting brackets 34 are directed to the left or right in the same direction as the rotation direction of the handle bar 31, the left and right front wheels WF respectively supported by the left and right mounting brackets 34 are also provided. You can drive in the left or right direction and turn left or right.

  At this time, the head pipe 24 can be rotated together with the body around the shaft 21a provided on the front frame 21 via the connecting pipe 24a in accordance with the steering direction, and can be tilted leftward or rightward. You can change the course to the right.

  When the head pipe 24 is tilted left and right, the lever 321 connected to the lower end of the handle post 32 moves slightly in the direction opposite to the direction in which the head pipe 24 is tilted. 36 is connected via a ball joint and can follow the rotation of the lever 321. Further, the amount of movement of the lever 321 in the left-right direction when the head pipe 24 is tilted in the left-right direction is small, and does not affect the front wheel WF that is going to continue straight.

  Further, since the extension line of the shaft center of the shaft 21a provided on the front frame 21 is set so as to contact the outer peripheral surface in front of the grounding portion of the rear wheel WR, the head pipe 24 is moved to the left and right via the handle bar 31. Even if the vehicle is tilted to the rear, the rear wheel WR also follows the tilt of the head pipe 24 in the left-right direction, falls in the left-right direction, and can travel while smoothly steering.

  Note that when the handle bar 31 is largely rotated in the left-right direction, the front wheel WF is greatly inclined toward the forward direction, so that the ground contact resistance with the ground is increased and the rotation in the forward direction is impaired. For this reason, it is preferable to provide a steering angle restricting device between the head pipe 24 and the handle post 32 to restrict the steering angle of the front wheels WF within a certain range. For example, although not shown in detail, a stopper is provided at the lower end portion of the head pipe 24 over an angle range corresponding to the allowable steering angle, and the lever 321 of the handle post 32 can contact the stopper of the head pipe 24. When the handle bar 31 is rotated by a certain angle or more, it is preferable that the abutting member abuts one of the stoppers and cannot be steered further.

  On the other hand, when stopping traveling of the tricycle 1, if the brake lever 52 is grasped with respect to the handle bar 31, the lever of the brake unit 51 is pulled through the brake cable 53, and the brake is applied to the rotation of the rear wheel WR. You can do it.

  Further, in the tricycle 1, since the contact member 461 of the crank arm 46 hits the main frame 23 and the second chain 443 cannot move any more, the sprocket 44 (drive sprocket 43) can be rotated further. Can not. For this reason, the direction of the front-back direction cannot be changed by rotating a rear wheel with a drive sprocket and a driven sprocket in a backward direction like a normal bicycle. Therefore, when the traveling direction of the tricycle 1 is changed back and forth, the head pipe 24 is tilted forward and the rear wheel WR is lifted off the ground, and then the left wheel or the right is turned around one front wheel WF. Just do it. As a result, even in a narrow place such as a narrow road, the traveling direction can be easily changed back and forth so as to change the direction of the carry bag with casters.

  By the way, in embodiment mentioned above, the main frame 23 can be rotated now about the axis | shaft 21a extended in the front-back direction with respect to the front frame 21 via the connection pipe 24a. When the head pipe 24 falls to the left or right side, an urging force acts so that the holding spring 241 on the other side is pulled and returned to the substantially vertical position. However, when the head pipe falls in the left-right direction via the handlebar 31 during traveling of the tricycle 1, anxiety is generated and it is difficult for beginners to travel at a constant speed. For this reason, when a beginner travels, a fixing member is provided between the head pipe 24 and the front frame 21 as shown in FIG. It is preferable that 242 be detachably fixed. As a result, it is possible to reliably prevent the head pipe 24 from falling in the left-right direction, and even a beginner can travel while holding the handlebar 31 held horizontally. If the user gets used to traveling the tricycle 1, the fixing member 242 for fixing the head pipe 24 to the front frame 21 may be removed.

  As described above, according to the tricycle 1 of the present invention, the user can grasp the handlebar 31 and place his / her foot on the footrest 28 to run in a substantially vertical posture, and the line of sight is taken from the ground. It is possible to observe a distant place almost parallel, and to grasp the unexpected situation ahead. In addition, because it is a compact size compared to ordinary bicycles, it can run lightly even in crowds, and because it is a three-wheeler, it can run stably without falling down. it can. Furthermore, the forward and backward traveling directions can be easily changed even on narrow roads. In addition, the front wheel WF does not enter the field of view, and it feels as if the feet are attached to the wheels, so that the user can ride happily.

It is a perspective view which shows one Embodiment of the tricycle of this invention. It is another perspective view of the tricycle of FIG. It is a front view which abbreviate | omits and shows the tricycle of FIG. It is the schematic which shows typically the drive mechanism of the tricycle of FIG. It is a front view which abbreviate | omits and shows a modification of the tricycle of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Tricycle 2 Frame 21 Front frame 21a Shaft 22 Guide post 23 Main frame 24 Head pipe 24a Connection pipe 29 Footrest 241 Holding spring 242 Fixing member 3 Steering mechanism 31 Handle bar 32 Handle post 321 Lever 33 Rotating shaft 34 Mounting bracket 4 Drive Mechanism 41, 42 Crankshaft 43 Drive sprocket 431 Driven sprocket 432 Chain 44 Sprocket 441 Movable sprocket 442 Guide sprocket 443 Spring 444 Chain 45 Kick lever 46 Crank arm 461 Contact member 47, 471 Cover 52 Brake lever WF Front wheel WR Rear wheel

Claims (5)

  A frame having a head pipe and a footrest that rotatably supports a handle post having a handle bar about a substantially vertical axis, and a left and right front wheel that is rotatably supported on the front portion of the frame, and a rear portion that is rotatable. The first and second crankshafts that are pivotally supported around the horizontal axis at intervals in the front-rear direction on the frame, and one end portion of the first crankshaft. A drive sprocket fixed to the other end, a sprocket fixed to the other end, and a second crank shaft fixed to one end, a pedal pivotally supported at the tip and fixed to the other end, A crank arm on which a movable sprocket is rotatably supported at the tip, a first chain wound between a driven sprocket and a drive sprocket provided on the hub of the rear wheel, and one end of the chain It consists of a second chain that is fixed to the rear part of the frame, wound with a movable sprocket and a sprocket and the other end fixed to the front part of the frame via a spring. The spring is extended by depressing the kick lever. A tricycle characterized in that the sprocket is rotated by moving the second chain and the rear wheel is rotated via the drive sprocket, the first chain and the driven sprocket.   2. The tricycle according to claim 1, wherein a contact member capable of contacting a frame is provided at a tip of the crank arm.   3. The tricycle according to claim 1, wherein the second chain is wound around a guide sprocket rotatably supported on a connecting material that supports the footrest, and the other end is connected to a spring. A tricycle.   The tricycle according to any one of claims 1 to 3, wherein the frame includes a front frame having guide posts that are substantially perpendicular to both ends, and a substantially horizontal axis having an axial center in the front-rear direction with respect to the front frame. The left and right mounting brackets that pivotally support the left and right front wheels are pivotally supported on each guide post via a pivot shaft, and the handlebar. A tricycle characterized in that it is connected so as to rotate in conjunction with a post and a steering rod and a tuning rod, and the head pipe is held in a substantially vertical state with respect to the front frame via a holding spring.   5. The tricycle according to claim 4, wherein the head pipe is fixed via a fixed frame that is detachable with respect to the front frame.

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