JP2009149147A - Bicycle equipped with rotatable steering wheel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bicycle equipped with a handle and a braking device suited to rotatable steering wheels. <P>SOLUTION: The bicycle 2 is equipped with a main frame 4, an operating unit 10, and a braking device 14. The operating unit 10 is equipped with the handle 20, and an operating shaft 22. The handle 20 is supported by the main frame 4 so that the operating shaft 22 is rotatable around a rotating shaft. The handle 20 is circular centering an axis line of the operating shaft 22. The braking device 14 is equipped with a brake lever 50 and a brake stay 48. The body of the brake lever 50 is supported to be rotatable by the brake stay 48. A grip 64 extending from the brake lever body is in a circular arc shape along a circular shape of the handle 20. The brake stay 48 is fixed on the operating shaft 22. The grip 64 is biased away from the handle 20. The brake is applied to the grip 64 by rotating the grip toward the handle 20. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a bicycle provided with a rotatable steering wheel. Specifically, the present invention relates to a handle and a braking device suitable for a rotatable steering wheel.

  There are bicycles that use the front wheels, which are steering wheels, as drive wheels. The front wheel of the steered wheel can rotate 360 °. As a result, the driving force can be transmitted in an arbitrary direction of 360 °. This bicycle has a large degree of freedom in steering, such as moving backward and obliquely backward.

  FIG. 8 is a front view of a conventional bicycle 102 in which front wheels, which are steered wheels, are used as drive wheels. This bicycle 102 is described in JP-A-2002-337781. The bicycle 102 includes a head rack 106 in front of the main frame 104. The head rack 106 holds a steering shaft 108 having a handle so as to be able to rotate 360 °. A handle 110 is provided above the steering shaft 108. The handle 110 has a bent bar shape. A central portion of the handle 110 is fixed to the upper end of the steering shaft 108. Grips 112 that are gripped by the driver are provided at both ends of the handle 110.

  The head rack 106 includes a drive transmission mechanism 118 that transmits the driving force of the first transmission chain 116 to the second transmission chain 126. A front wheel 120 is rotatably attached to the lower end of the steering shaft 108.

  When the driver strokes the crank 122, the first chain gear 124 rotates. The rotation of the first chain gear 124 is transmitted to the drive transmission mechanism 118 via the first transmission chain 116. The drive transmission mechanism 118 transmits this driving force to the lower portion of the head rack 106 by a reciprocating linear motion. This linear motion is converted into rotational motion below the head rack 106 and transmitted to the second transmission chain 126. The driving force is transmitted to the free wheel 128 via the second transmission chain 126. The front wheel 120 is rotated by the driving force transmitted to the free wheel 128.

In the bicycle 102, the driver grasps the grip 112 and the handle 110 is released. When the handle 110 is released, the traveling direction of the front wheel 120 is changed. Thereby, the advancing direction of the bicycle 102 is changed. In this bicycle 102, it is possible to transmit the driving force while the handle 110 is rotatable.
JP 2002-337781 A

  Although not shown, the bicycle 102 generally includes a brake lever on the handle 110. The brake lever is pivotally mounted below the grip. When the driver holds the grip 112 and the brake lever by hand, the brake lever is pulled toward the grip 112. By pulling the grip, a wire (not shown) is pulled. By pulling the wire, a brake attached to the front wheel or the rear wheel is operated to stop the rotation of the wheel.

  In the bicycle 102, the brake may be applied in a state where the handle 110 is fully extended. For example, when the handle 110 is turned 90 ° from the straight direction, one of the grips 112 is positioned on the driver side, and the other of the grips 112 is positioned far away from the driver. In this bicycle 102, it is difficult to maneuver when the handle 110 is fully extended.

  When the handle 110 is widened, the brake lever is located on the driver side with the steering shaft 108 in the same manner as the grip 112, and the other is located far from the driver. In this bicycle 102, it is difficult to perform a brake operation with the handle 110 being fully extended.

  An object of the present invention is to provide a bicycle including a steering wheel and a braking device suitable for a rotatable steering wheel.

  A bicycle according to the present invention includes a main frame, a steering unit, and a braking device. The steering unit includes a handle and a steering shaft. This handle is fixed to the steering shaft. The handle is supported by the main frame so as to be rotatable about a steering shaft as a rotation shaft. This handle is circular with the axis of the steering shaft as the center. This braking device includes a brake lever and a brake stay. The brake lever includes a brake lever body and a grip extending from the brake lever body. The brake lever body is rotatably supported by the brake stay. This grip is arcuate along the circle of the handle. This brake stay is fixed to the steering shaft. This grip is biased away from the handle. This grip is rotated in a direction approaching the handle to be braked.

  Preferably, the bicycle according to the present invention includes a pin stay, a pin, and an elastic body. The pin is supported by the pin stay so as to be slidable in the axial direction of the pin. This elastic body urges the pin in a direction away from the brake lever. With the grip rotated in a direction approaching the handle, the pin is brought into contact with the brake lever against the biasing force of the elastic body, and the brake lever is rotated in a direction away from the handle. That is blocked.

  The bicycle according to the present invention is a bicycle having a rotatable steering wheel, and is excellent in maneuverability even if the steering shaft is widened. In this bicycle, the operability of the brake is excellent even if the steering shaft is large.

  Hereinafter, the present invention will be described in detail based on preferred embodiments with appropriate reference to the drawings.

  FIG. 1 is a front view of a bicycle 2 according to an embodiment of the present invention. The rightward direction in FIG. 1 is the forward direction of the bicycle 2. The left direction in FIG. 1 is the rear direction of the bicycle 2. The bicycle 2 includes a main frame 4, front wheels 6, a pair of rear wheels 8, a steering unit 10, a driving device 12, and a braking device 14. In this bicycle 2, the front wheels 6 are driven as drive wheels. The front wheel 6 is a steering wheel.

  The rear wheel 8 is rotatably attached to the rear of the main frame 4. In the bicycle 2, a pair of rear wheels 8 are rotatably attached to the left and right side surfaces of the bicycle 2 with the main frame 4 interposed therebetween. The pair of rear wheels 8 is rotatable in the front-rear direction of the bicycle 2. The main frame 4 includes a saddle 16 on the upper side. A head pipe 18 is provided in front of the main frame 4. The head pipe 18 is hollow and has a cylindrical shape.

  FIG. 2 is a side view of the handle 20 of the bicycle 2 of FIG. FIG. 2 is a view of the bicycle 2 shown in FIG.

  FIG. 3 is a plan view of the handle 20 of the bicycle 2 of FIG. FIG. 3 is a view of the bicycle 2 shown in FIG. The upper part of FIG. 3 is the front, and the lower part is the rear. As shown in FIG. 3, the handle 20 includes a handle body 26, a shaft fixing portion 28, and spokes 30. The handle body 26 has a ring shape. The shaft fixing portion 28 has a disc shape, and its center is matched with the center of the handle body 26. The shaft fixing portion 28 and the handle main body 26 are connected by a spoke 30 and are integrated.

  The steering shaft 22 has a round bar shape. As shown in FIG. 1, the shaft fixing portion 28 of the handle 20 is fixed to the upper end of the steering shaft 22. The axis of the steering shaft 22 is matched with the axis of the rotation shaft of the handle body 26. The steering shaft 22 is rotatably held by the head pipe 18 between the upper end and the lower end. In this bicycle 2, the steering shaft 22 is rotatably supported on the head pipe 18 by a bearing (not shown). The steering shaft 22 is supported so as to be rotatable about its axis.

  As shown in FIG. 1, the steering unit 10 includes a handle 20, a steering shaft 22, and a pair of forks 24. Although not shown, when viewed in the direction of the arrow A in FIG. 1, the pair of forks 24 extends in an inverted U shape downward. The front wheel 6 is supported by a pair of forks 24. The front wheel 6 is located between the pair of forks 24. The front wheel 6 is rotatably supported with its center as a rotation axis.

  As shown in FIG. 1, the drive device 12 includes a crank 32, a drive gear 34, a first chain 36 as an endless continuous rope, a first bevel gear 38, a double-sided bevel gear 40, a second bevel gear 42, an endless link. A second chain 44 as a rope and a driven gear 46 are provided. The first bevel gear 38 includes a gear and a free wheel. This gear and the first bevel gear 38 are integrated with the center of rotation being coaxial. The second bevel gear 42 includes a gear. This gear and the second bevel gear 42 are integrated with each other with the center of rotation being coaxial.

  The pair of cranks 32 are rotatably attached to the left and right sides of the main frame 4 respectively. A drive gear 34 is rotatably attached to the main frame 4. The rotation shaft of the crank 32 and the rotation shaft of the drive gear 34 are in the horizontal direction and are coaxial. A first chain 36 is bridged over the drive gear 34. The first bevel gear 38 is supported by the head pipe 18. The first bevel gear 38 is supported so that the rotation shaft can rotate in the horizontal direction. The first chain 36 is spanned between the gear of the first bevel gear 38 and the drive gear 34.

  The double-sided bevel gear 40 includes an upper bevel and a lower bevel. The double-sided bevel gear 40 is attached to the steering shaft 22 so as to be rotatable about its axis. In the bicycle 2, the double-sided bevel gear 40 is rotatably supported on the steering shaft 22 via a bearing. The bevel teeth of the first bevel gear 38 mesh with the bevel teeth above the double-side bevel gear 40.

  The second bevel gear 42 is rotatably supported on the steering shaft 22. The second bevel gear 42 is supported so as to be rotatable about the horizontal direction as a rotation axis. The bevel teeth of the second bevel gear 42 mesh with the bevel teeth below the double-side bevel gear 40. The driven gear 46 is fixed to the front wheel 6. The driven gear 46 is fixed with the front wheel 6 and the rotation shaft being the same. The second chain 44 is spanned between the gear of the second bevel gear 42 and the driven gear 46.

  As shown in FIG. 1, the braking device 14 includes a brake stay 48, a pair of brake levers 50, a wire connection portion 52, a first wire 54, a second wire 56, a pair of brake calipers 58, and a pair of brake discs 60. I have. The brake stay 48 is fixed to the steering shaft 22. The brake stay 48 is located below the handle 20.

  As shown in FIG. 3, the pair of brake levers 50 each include a brake lever main body 62 and a grip 64. The pair of brake levers 50 are symmetrical with respect to the front-rear direction passing through the rotation axis. The brake lever main body 62 is plate-shaped. One end of the brake lever body 62 is located in the vicinity of the steering shaft 22. A grip 64 extends from the other end of the brake lever body 62. The grip 64 extends in an arc shape along the outer diameter of the ring shape of the handle body 26.

  As shown in FIGS. 2 and 3, the brake stay 48 includes a lever stay 66, a stopper 68, and a wire hole 70. The lever stay 66 is located in the vicinity of the steering shaft 22. The brake lever 50 is pivotally attached to the lever stay 66 at one end of the brake lever main body 62. The brake lever 50 is pivotally attached so that the grip 64 can rotate in a direction approaching the handle body 26. The stopper 68 is fixed to the brake stay 48. The stopper 68 is located between the brake stay 48 and the brake lever body 62. The stopper 68 is located between the lever stay 66 and the grip 64.

  The wire hole 70 shown in FIG. 3 is formed in the brake lever main body 62. Two wire holes 70 are formed in each of the pair of brake lever bodies 62. The first wires 54 are respectively passed through the four wire holes 70. The distal ends of the first wires 54 are connected to the wire holes 70 of the brake lever body 62 so as not to come off.

  The bicycle 2 includes a pin stay 74, a pin 76, and a coil spring 78 as an elastic body. The pin stay 74 is fixed to the brake stay 48. The pin stay 74 is located between the lever stay 66 and the grip 64. The pin 76 is passed through the pin stay 74. The pin stay 74 holds the pin 76 so as to be slidable. The sliding direction of the pin 76 is parallel to the rotational axis of rotation of the brake lever body 62. The coil spring 78 is passed through a pin 76. The pin 76 is biased by a coil spring 78 in a direction away from the brake lever main body 62. When the brake lever body 62 is in contact with the stopper 68 and the pin 76 is slid in the direction approaching the brake lever body 62, the pin 76 is in a position where it interferes with the brake lever body 62.

  FIG. 4 is a side sectional view of the wire connecting portion 52 of the bicycle 2 of FIG. The wire connection portion 52 includes a circular top plate 80, a first wire retaining disk 82, a bottom plate 84, a second wire retaining disk 86, and a case 88.

  The top plate 80 has a circular plate shape. A hole is formed in the center of the top plate 80. The steering shaft 22 is passed through this hole. The top plate 80 is fixed to the steering shaft 22. A first wire retaining disk 82 is located below the top plate 80. The first wire retaining disk 82 has a circular plate shape. The first wire retaining disk 82 has a hole formed in the center. A steering shaft 22 is passed through this hole. The first wire retaining disk 82 is slidable in the axial direction of the steering shaft 22.

  A bottom plate 84 is located further below the first wire retaining disk 82. The bottom plate 84 has a circular plate shape. The bottom plate 84 has a hole in the center. A steering shaft 22 is passed through this hole. The bottom plate 84 is fixed to the head pipe 18. The second wire retaining disk 86 is located between the top plate 80 and the first wire retaining disk 82. The second wire retaining disk 86 has a circular plate shape. The second wire retaining disk 86 has a hole in the center. The steering shaft 22 and the first wire 54 are passed through the hole of the second wire retaining disk 86. The steering shaft 22 is passed through the second wire retaining disk 86 so as to be rotatable about the axis of the steering shaft 22. The second wire retaining disk 86 is slidable in the axial direction of the steering shaft 22. A bearing is mounted between the first wire retaining disk 82 and the second wire retaining disk 86. The first wire retaining disk 82 and the second wire retaining disk 86 are relatively rotatable about the steering shaft 22 as a rotational axis.

  FIG. 5 is a plan sectional view of the wire connection portion 52 shown in FIG. A point P indicates the center of the rotating shaft 22. A pair of wire holes 90 are formed in the vicinity of the outer peripheral edge of the second wire retaining disk 86. The pair of wire holes 90 has the steering shaft 22 in between. The point P is located on a straight line passing through the pair of wire holes 90 and is the midpoint of the pair of wire holes 90. Two second wires 56 are passed through the wire holes 90 one by one and are prevented from coming off and connected to the second wire retaining disk 86.

  Four wire holes 92 are formed in the vicinity of the inner peripheral edge of the hole of the first wire retaining disk 82. The point P is located in a straight line passing through the two wire holes 92 that are not adjacent to each other. Point P is the midpoint of these two wire holes 92. The first wire 54 connected to one brake lever main body 62 of the pair of brake lever main bodies 62 is connected to the two wire holes 92 that are not adjacent to each other. The first wire 54 connected to the other brake lever main body 62 is connected to the other two adjacent wire holes 92. The four first wires 54 are passed through the four wire holes 92 one by one and are prevented from coming off and connected to the first wire retaining disk 82. In the first wire retaining disk 82 of the bicycle 2, the four wire holes 92 are positioned on a circle centered on the point P and are arranged at equal intervals of 90 °.

  As shown in FIG. 1, one of the two second wires 56 is connected to the caliper 58 of the right rear wheel 8. The other second wire 56 is connected to a caliper 58 of the left rear wheel 8. The second wire 56 is connected to a pair of rear wheels 8 that are driven wheels. In the vicinity of the caliper 58, a disk 60 fixed to the rear wheel 8 is located.

  In the bicycle 2 in FIG. 1, the crank 32 is wound by the driver, and the crank 32 is rotated. The drive gear 34 is rotated by the rotation of the crank 32. The rotation of the drive gear 34 is transmitted by the first chain 36 to a first bevel gear 38 having a gear. The first bevel gear 38 includes a free wheel. With this freewheel ratchet structure, only one rotational direction of the first chain 36 is transmitted to the double-sided bevel gear 40. The other rotation direction is not transmitted to the double-sided bevel gear 40 by the free wheel. The first bevel gear 38 is rotated in one rotational direction by the first chain 36. The first bevel gear 38 is rotated with the horizontal direction as the rotation axis.

  By the rotation of the first bevel gear 38, the double-sided bevel gear 40 is rotated. The double-sided bevel gear 40 is rotated about the axis of the steering shaft 22 as a rotation axis. By the first bevel gear 38 and the double-sided bevel gear 40, the rotation with the horizontal direction as the rotation axis is converted into the rotation with the steering shaft 22 as the rotation axis. The second bevel gear 42 is rotated by the rotation of the double-sided bevel gear 40. The double bevel gear 40 and the second bevel gear 42 convert the rotation about the steering shaft 22 into the rotation about the horizontal direction as the rotation axis. The rotation of the gear provided in the second bevel gear 42 is transmitted to the driven gear 46 via the second chain 44. The front wheel 6 is rotated by the rotation of the driven gear 46. The driving force is transmitted to the driven gear 46 and the front wheel 6 as rotation in the horizontal direction. The bicycle 2 is caused to travel by driving the front wheels 6.

  The handle 20 of FIG. 1 is rotated by the driver. As the handle 20 rotates, the steering shaft 22 rotates. The steering shaft 22 is freely rotatable by 360 °. The handle 20 includes a ring-shaped handle body 26. The steering wheel 20 can be easily steered in any direction of 360 ° rotation. The handle body 26 is not limited to a ring shape. The handle body 26 may have a circular shape whose center of rotation is the steering shaft 22. For example, the handle body 26 may have a disk shape. The handle 20 of the bicycle 2 is also suitable for a wheelchair. The traveling direction of the front wheel 6 is changed by the rotation of the steering shaft 22. Thereby, the traveling direction of the bicycle 2 is changed. The bicycle according to the present invention includes a wheelchair. The bicycle 2 includes a handle 94 at the top of the handle body 26. The handle 94 facilitates handle operation with one hand.

  In this bicycle 2, the front wheels 6 are drive wheels and steering wheels. When the steering wheel 20 is turned and the traveling direction of the front wheel 6 is changed from the straight traveling direction to the diagonally forward direction, the bicycle 2 is turned while moving forward. When the traveling direction of the front wheel 6 is changed from the straight traveling direction to the diagonally rearward direction, the bicycle 2 is turned while retreating. When the traveling direction of the front wheel 6 is changed by 180 ° from the straight traveling direction, the bicycle 2 is moved backward. In this way, the bicycle 2 is suitable for small turns. The configuration of steering and driving of the bicycle 2 is also suitable for a wheelchair.

  6A is a partial side view showing the brake lever 50 in the traveling state of the bicycle 2 in FIG. 1, and FIG. 6B is a partial side view showing the brake lever 50 to which the brake is applied. is there. In the traveling state of FIG. 6A, the first wire 54 is urged downward by an elastic body (not shown). Thereby, the brake lever main body 62 is in contact with the stopper 68. The driver grips the handle body 26 and the grip 64 of the brake lever 50. The grip 64 is pulled toward the handle body 26. The first wire 54 is pulled up together with the brake lever body 62.

  The two first wires 54 connected to one brake lever main body 62 are connected to two wire holes 92 that are not adjacent to each other. The two first wires 54 connected to the other brake lever main body 62 are connected to the other two non-adjacent wire holes 92. With this configuration, when any one of the brake levers 50 is pulled up, the first wire retaining disk 82 shown in FIG. 4 is pulled up smoothly. When the first wire retaining disk 82 is pulled up, the second wire retaining disk 86 is pulled up.

  The second wire 56 is pulled up by pulling up the second wire retaining disk 86. When one of the second wires 56 shown in FIG. 1 is pulled, the right caliper 58 is actuated. The caliper 58 presses the pad against the disc 60 of the right rear wheel 8. By pulling the other second wire 56, the left caliper 58 is actuated. The caliper 58 presses the pad against the disk 60 of the left rear wheel 8. In this bicycle 2, the left and right rear wheels 8 are braked simultaneously when the second wire retaining disk 86 is pulled up. Thereby, the one effect of the brake of a pair of wheel is suppressed. The braking device 14 can brake the pair of rear wheels 8 with one hand. This brake is suitable as a braking device for wheelchairs for the disabled and elderly.

  When the driver loosens the hand holding the grip 64, the first wire 54 and the second wire 56 are pulled back by the biasing force of the elastic body (not shown). Thereby, the brake of the rear wheel 8 is released. Thereby, the brake lever 50 is pulled back. The brake lever body 62 is returned to the position where it abuts against the stopper 68.

  The grip 64 extends in an arc shape along the outer diameter of the ring shape of the handle body 26. As a result, it is easy to operate the brake when the handle is fully extended.

  7A is a partial side view showing the positional relationship between the pin 76 and the brake lever main body 62 in the traveling state of the bicycle 2 in FIG. 1, and FIG. 7B is a state in which the parking brake is applied. 6 is a partial side view showing the positional relationship between the pin 76 and the brake lever main body 62. FIG. When the bicycle 2 is stopped, the brake lever 50 is pulled up. A first wire 54 (not shown) is pulled up by the brake lever body 62. In FIG. 7B, the brake lever main body 62 is in a raised state. In this state, the bicycle 2 is braked.

  As shown in FIG. 7B, the pin 76 is pushed under the brake lever body 62 against the urging force of the coil spring 78 in a state where the brake lever body 62 is pulled up. When the driver releases his hand from the brake lever 50, the first wire 54 is pulled back by an urging force of an elastic body (not shown). The brake lever main body 62 is pressed against the pin 76 by the first wire 54. By this pressing force, the pin 76 is maintained in a state where it is pushed under the brake lever body 62 against the biasing force of the coil spring 78. Thereby, even if a driver | operator removes a hand from the pin 76, the state pushed in under the brake lever main body 62 is maintained. Thereby, the state where the brakes of the left and right rear wheels 8 are applied is maintained.

  The pin 76 is pulled away from the bottom of the brake lever main body 62 by the driver. The brake lever main body 62 is pulled back to the first wire 54. As a result, the brake applied to the left and right rear wheels 8 is released. As a result, the positional relationship between the pin 76 and the brake lever main body 62 returns to the original position shown in FIG.

  In the bicycle 2 of FIG. 1, the rear wheel 8 is a braking wheel. The front wheel 6 may be a braking wheel. The steered wheel may be a brake wheel. The driving wheel may be a braking wheel. Even in these bicycles, the handle 20 and the brake device 14 can be used.

  Even in a bicycle provided with casters at four positions on the front left and right and rear left and right of the main frame of the bicycle and provided with driving wheels and steering wheels, the handle 20 and the brake device 14 can be used for the driving wheels and steering wheels. This caster is a wheel whose traveling direction can be freely changed. For example, driving and steering wheels may be provided between the front left and right casters and the rear left and right casters of the main frame. This bicycle can move in any direction regardless of the front-rear direction of the main frame. This bicycle is more suitable for wheelchairs because it is more effective in turning. By providing front left and right casters, rear left and right casters, and driving and steering wheels, linear movement is possible in any direction of 360 ° in the traveling direction of the driving and steering wheels.

  The bicycle 2 in FIG. 1 is driven by a crank 32. This crank 32 is rotated by the foot. The crank 32 may be installed above the main frame 4 and may be a manual crank. Instead of driving by human power, the drive gear 34 may be driven by a motor.

  As shown in this embodiment, the bicycle according to the present invention is superior to the bicycle 102 in terms of maneuverability and brake operability. This bicycle is also suitable for wheelchair steering and braking devices.

  The present invention can be applied to a bicycle including a wheelchair having a rotatable steering wheel.

FIG. 1 is a front view of a bicycle according to an embodiment of the present invention. FIG. 2 is a side view of the bicycle handle of FIG. FIG. 3 is a plan view of the handle of the bicycle shown in FIG. FIG. 4 is a side sectional view of the wire connecting portion of the bicycle of FIG. FIG. 5 is a cross-sectional plan view of the wire connecting portion shown in FIG. FIG. 6A is a partial side view showing the brake lever in the traveling state of the bicycle of FIG. 1, and FIG. 6B is a partial side view showing the brake lever to which the brake is applied. FIG. 7A is a partial side view showing the positional relationship between the pin and the brake lever body in the running state of the bicycle of FIG. 1, and FIG. 7B is the pin and brake lever body in a state where the parking brake is applied. It is the partial side view by which positional relationship was shown. FIG. 8 is a front view of a conventional bicycle using the front wheels, which are steered wheels, as drive wheels.

Explanation of symbols

DESCRIPTION OF SYMBOLS 2 ... Bicycle 4 ... Main frame 6 ... Front wheel 8 ... Rear wheel 10 ... Steering part 12 ... Driving device 14 ... Braking device 16 ... Saddle 18 ... Head Pipe 20 ... Handle 22 ... Steering shaft 24 ... Hawk 26 ... Handle body 28 ... Shaft fixing part 30 ... Spoke 32 ... Crank 34 ... Drive gear 36 ... 1st chain 38 ... 1st bevel gear 40 ... Double-sided bevel gear 42 ... 2nd bevel gear 44 ... 2nd chain 46 ... Driven gear 48 ... Brake stay 50 ... Brake Lever 52 ... Wire connection 54 ... First wire 56 ... Second wire 58 ... Brake caliper 60 ... Brake disc 62 ... Brake lever body 64 ... Grip 66 ... Les -Stay 68 ... Stopper 70 ... Wire hole 74 ... Pin stay 76 ... Pin 78 ... Coil spring 80 ... Top plate 82 ... First wire retaining disc 84 ... Bottom plate 86 ... Second wire retaining disk 88 ... Case 90 ... Wire hole 92 ... Wire hole 94 ... Handle 102 ... Bicycle 104 ... Main frame 106 ... Head rack 108 ··· Steering shaft 110 ··· handle 112 ··· grip 116 ··· first transmission chain 118 ··· drive transmission mechanism 120 · · · front wheel 122 · · · crank 124 ··· first chain gear 126 ···・ Second transmission chain 128 ... Freewheel

Claims (2)

A main frame, a steering unit, and a braking device;
This steering part has a steering wheel and a steering shaft,
This handle is fixed to the steering shaft,
This handle is supported by the main frame so that the steering shaft can rotate about the rotation shaft.
This handle is circular around the axis of the steering shaft,
This braking device has a brake lever and a brake stay,
The brake lever includes a brake lever body and a grip extending from the brake lever body.
This brake lever body is rotatably supported by the brake stay,
This grip is arcuate along the circle of the handle,
This brake stay is fixed to the steering shaft,
This grip is urged away from the handle,
A bicycle that can be braked by turning this grip closer to the steering wheel. It has a pin stay, a pin, and an elastic body.
This pin is supported by the pin stay so as to be slidable in the axial direction of the pin.
This elastic body urges the pin away from the brake lever,
When the grip is rotated toward the handle, the pin is brought into contact with the brake lever against the biasing force of the elastic body, and the brake lever is rotated away from the handle. 2. A bicycle according to claim 1, wherein is prevented.

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