JPH07277257A - Bicycle - Google Patents

Abstract

PURPOSE:To reduce the weight and make flexible of a bicycle which is designed so that the rotations of pedals are transmitted to the rear wheel via the driving shaft of a rear frame by supporting the shaft of the rear wheel to the rear frame in a cantilever manner so that the shaft freely rotates. CONSTITUTION:A bicycle has a pedal holding portion 6 disposed below a main body frame on the top of which a saddle is mounted, the pedal holding portion 6 holding a pedal shaft 5 in such a way that the shaft freely rotates. A driving shaft 15 connected to the pedal holding portion 6 at its front end and to the shaft 11 of the rear wheel 10 at its rear end is disposed inside a rear frame connected to the rear of the main body frame. In this case, the rear wheel 10 is freely rotatably supported to the rear frame in a cantilever manner. A bevel gear 18 that meshes with the bevel gear 16 of the pedal shaft 5 is disposed at the front end of the drive shaft 15 and a bevel gear 19 that meshes with the bevel gear 17 of the rear wheel shaft 11 is disposed at the rear end of the drive shaft 15.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bicycle having a structure in which rotation of a pedal is transmitted to a rear wheel through a drive shaft.

[0002]

2. Description of the Related Art Conventionally, bicycles have mainly used a chain as a means for transmitting the rotation of a pedal to a rear wheel.

On the other hand, instead of a chain for transmitting the rotation of the pedal to the rear wheel, a structure in which a bevel gear and a drive shaft are combined has been put into practical use. The feeling was heavy, and the bicycle as a whole was heavy.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and enables a bicycle having a structure in which the rotation of a pedal is transmitted to a rear wheel through a drive shaft to be lightweight and flexible. The purpose is to

[0005]

In order to solve this problem, the present invention has a main body frame having a pedal holding portion for rotatably holding a pedal shaft, to which a saddle is attached, and a front portion of the main body frame. And a front frame rotatably holding the front wheel at the bottom and a handle attached to the upper part, and one end attached to the pedal holding part of the main body frame and the shaft of the rear wheel is cantilevered at the other end A rear frame held by the rear frame, a bevel gear arranged on the rear frame and connected to the pedal shaft and a bevel gear meshing with the bevel gear connected to the shaft of the rear wheel are attached to both ends to transmit the rotation of the pedal shaft to the rear wheel. And a drive shaft of.

[0006]

With this structure, in the bicycle having the structure in which the rotation of the pedal is transmitted to the rear wheels through the drive shaft, the bicycle using the drive shaft is used because the rear wheel shaft is rotatably held in a cantilever state. It will be possible to reduce the weight and make it more flexible.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A bicycle according to an embodiment of the present invention will be described below with reference to the drawings of FIGS.

In the figure, 1 is a pipe-shaped metal main body frame, 2 is a pipe-shaped metal front frame held at the front of the main body frame 1, and 3 is a main body frame 1.
It is a pipe-shaped metal rear frame held in the rear part. A saddle 4 is attached to the upper portion of the main body frame 1, and a pedal holding portion 6 that rotatably holds a pedal shaft 5 coupled to a pedal is provided on the lower portion. In addition, the front wheels 7 are attached to the lower part of the front frame 2.
The shaft 8 is rotatably held in a cantilever state, and a handle 9 is attached to the upper part. Furthermore, one end of the rear frame 3 is rotatably attached to the pedal holding portion 6 of the main body frame 1, and the shaft 11 of the rear wheel 10 is rotatably held in a cantilever state at the other end.

Numeral 12 is a suspension means composed of a metal spring arranged between the main body frame 1 and the middle portion of the rear frame 3, and as shown in FIG. Mounting part 13
Are connected to each other by a fixture 14 including a bolt and a nut. That is, the suspension means 12 absorbs an impact applied to the rear frame 3 through the rear wheel 10.

Reference numeral 15 denotes a drive shaft arranged on the rear frame 3. At both ends of the drive shaft 15, as shown in FIG. 3, a bevel gear 16 connected to the pedal shaft 5 and a shaft 11 of the rear wheel 10 are provided. A bevel gear 18, which meshes with the coupled bevel gear 17,
19 is attached to rotate the pedal shaft 5 to the rear wheel 1
Transmit to 0.

As shown in FIGS. 5 and 6, the main body frame 1
A gear box 20 attached to one end of the rear frame 3 is rotatably attached to a pedal holding portion 6 of the rear frame 3 by a steel ball 21, and the pedal shaft 5 is attached to the gear box 20 by a bearing 22a and a steel ball 22b. It is rotatably held by. In addition, 23 is a ball pushing for pushing the ball of one bearing 21, 24 is a link for attaching the gear box 20 to the pedal holding part 6. Therefore, the gear box 20 is rotatably attached to the pedal holding portion 6, whereby the rear frame 3 is configured to be swingable.

A bevel gear 16 is fixed to the pedal shaft 5, and the bevel gear 1 of the drive shaft 15 is fixed.
8 is in mesh. Reference numeral 25 denotes a bearing for rotatably holding one end of the drive shaft 15 in the gear box 20.

Also on the rear wheel 10 side, a gear box 26 is attached to one end of the rear frame 3, and the shaft 11 of the rear wheel 10 is rotatably held on the gear box 26 and is attached to the shaft 11. The bevel gear 17 is connected via a ratchet mechanism that can transmit rotation only when the rear wheel 10 rotates forward. And
A rear end of the drive shaft 15 having a bevel gear 19 meshing with the bevel gear 17 is rotatably held in a gear box 26 by a bearing 27.

That is, the rotation of the pedal shaft 5 causes the drive shaft 15 to rotate and the rotation is transmitted to the shaft 11 of the rear wheel 10. At this time, the rotation is transmitted to the shaft 11 only in one direction by the ratchet mechanism.
You can perform the same operation as a bicycle using a normal chain.

Reference numeral 28 denotes a folding mechanism portion. As shown in FIGS. 7 and 8, the main body frame 1 is provided between the front frame 2 to which the front wheel 7 is attached and the pedal holding portion 6, and is made foldable. It comprises a hinge means 29 and a fixing means 30 for fixing the hinge means 29 during use and for opening and closing the hinge means 29 when folding. Here, the front wheels 7 and the rear wheels 10 are disk-shaped wheels 7a, 1 on which shafts 8, 11 are attached at their central portions.
0a and tires 7b and 10b attached to the outer circumferences of the wheels 7a and 10a, and the wheels 7a and 10a have a curved surface outwardly curved on the side opposite to the folding direction.

That is, when the folding mechanism 28 is operated to fold the bicycle, the wheels 7a, 10a of the front wheels 7 and the rear wheels 10 are operated so as to have a substantially spherical shape, and the user operates the folding direction by mistake. It does not try, and when folded, the front and rear wheels fit together, and when viewed from the front, it becomes hemispherical.

Further, in this embodiment, the suspension means 32 is also arranged between the front wheel 7 of the front frame 2 and the handle 2, so that the impact from the front wheel 7 can be alleviated.

FIG. 9 shows another embodiment of the present invention.
In this embodiment, the support structure for the front wheels 7 and the rear wheels 10 is a double-supported structure. That is, a forked portion 2a is provided in the lower portion of the front frame 2, the shaft 8 of the front wheel 7 is rotatably held by the forked portion 2a, and one end of the gear box 20 is provided at the rear portion separately from the rear frame 3. Place the attached rear frame 31 in parallel with the rear frame 3,
Attach the shaft 11 of the rear wheel 10 to the two rear frames 3, 31
Holds rotatably.

10 and 11 show another embodiment as the hinge means. In this embodiment, a standing pipe 33 is provided above the pedal holding portion 6, and the standing pipe 33 is attached to the body frame 1. The shaft support pipe 34 of the front frame 2 to which the front wheel 7 is attached, and the upper pipe 35 to which the saddle 4 is attached and the suspension means 32 are attached are fitted. The shaft support pipe 34 is rotatably supported by the vertical pipe 33 between the pedal holder 6 and the upper pipe 35. Then, the protrusions and recesses 36 provided on the upper and lower ends of the shaft support pipe 34 are fitted to the protrusions and recesses 37 provided on the corresponding parts of the pedal holding portion 6 side and the upper pipe 35 side, and at the same time, on the standing pipe 33. It is pressed by the attached pressing seat 38, further reduced in diameter with the shaft support pipe 34, and fixed to the standing pipe. In this case, the frame angle is set at the concavo-convex position, and the female screw on the inner diameter portion of the pressing seat 38 having the hexagonal hole 38a and the male screw 33a on the upper end of the standing pipe 33 are screwed together to be fixed by pressing to secure the safety. The device. If the vertical pipe 33 and the upper pipe 35 are fitted to each other only by sliding in the axial direction, the fixing force is further improved. Further, the shaft support pipe 34 is fixed to the vertical pipe 33 by press-fitting it by fitting a bolt 39 into a bolt seat 34b for adjusting the width of the vertical groove 34a and reducing the diameter of the shaft support pipe 34. . Since the two types of fixing means are used in combination as described above, it is reliable and the strength applied to each component is small, and the weight can be reduced. Further, since the suspension means 32 is loaded in the upward direction a, when the pressing seat 38 is loosened, the upper pipe 35 slides upward, the concave and convex fitting is released, and the main body frame 1 can be easily folded. it can.

[0020]

As described above, according to the present invention, it is possible to reduce the weight of a bicycle using a drive shaft. In addition, by providing a folding mechanism, in combination with the rotation transmission mechanism by the drive shaft, when folding and carrying the bicycle, there is no problem of getting dirty like a bicycle using a chain, and further, a suspension means is provided. As a result, riding comfort is improved and the impact applied to the gear part that rotates the drive shaft is mitigated, so that a good gear meshing state can be maintained, rigidity is ensured, and smooth and smooth operability is achieved. Can have

[Brief description of drawings]

FIG. 1 is a side view showing a bicycle according to an embodiment of the present invention.

FIG. 2 is an enlarged view showing the structure of the main part of the bicycle.

FIG. 3 is a sectional view showing the structure of the main part of the bicycle.

FIG. 4 is a sectional view showing the structure of the main part of the same.

FIG. 5 is a sectional view showing the structure of the main part of the same.

FIG. 6 is an exploded perspective view showing the structure of the main part of the same.

FIG. 7 is a perspective view showing the structure of the main part of the same.

FIG. 8 is a perspective view showing the structure of the main part of the same.

FIG. 9 is a plan view showing a bicycle according to another embodiment of the present invention.

FIG. 10 is a side view showing a bicycle according to another embodiment of the present invention.

FIG. 11 is an exploded perspective view showing the structure of the main part of the same.

[Explanation of symbols]

 1 Main Frame 2 Front Frame 3, 31 Rear Frame 5 Pedal Shaft 6 Pedal Holding Part 7 Front Wheel 8, 11 Shaft 10 Rear Wheel 12, 32 Suspension Means 15 Drive Shaft 16, 17, 18, 19 Bevel Gear 20, 26 Gear Box 28 Folding mechanism part 29 Hinge means 30 Fixing means 33 Standing pipe 34 Shaft support pipe 34a Vertical groove 34b Bolt seat 35 Upper pipe 36, 37 Concavo-convex part 38 Pressing seat

Claims (9)

[Claims] 1. A main body frame having a pedal holding portion for rotatably holding a pedal shaft and having a saddle attached thereto, a front portion of the main body frame rotatably holding a front wheel at a lower portion thereof, and a handle at an upper portion thereof. A front frame to which is attached, a rear frame having one end attached to the pedal holding portion of the main body frame and the other end rotatably holding the shaft of the rear wheel in a cantilever state, and the rear frame disposed on the rear frame. A bicycle equipped with a bevel gear connected to the pedal shaft and a bevel gear that meshes with a bevel gear connected to a shaft of a rear wheel at both ends of the drive shaft for transmitting rotation of the pedal shaft to the rear wheel. 2. A main body frame having a pedal holding portion for rotatably holding a pedal shaft and having a saddle attached thereto, a front portion of the main body frame, a front wheel being rotatably held at a lower portion, and a handle being provided at an upper portion. A front frame to which is attached, a rear frame having one end attached to the pedal holding portion of the main body frame and the other end rotatably holding the shaft of the rear wheel in a cantilever state, and the rear frame disposed on the rear frame. A bevel gear connected to the pedal shift and a bevel gear that meshes with a bevel gear connected to the shaft of the rear wheel are attached to both ends, and a drive shaft for transmitting the rotation of the pedal shaft to the rear wheel is provided, and the main frame is attached to the front wheel. Folded via hinge means between the front part and the pedal holding part A bicycle provided with fixing means for enabling the hinge means to be opened and closed when the hinge means is fixed and folded when used. 3. A main body frame having a pedal holding portion for rotatably holding a pedal shaft and having a saddle attached thereto, a front portion of the main body frame rotatably holding a front wheel at a lower portion thereof, and a handle at an upper portion thereof. A front frame to which is attached, a rear frame having one end attached to the pedal holding portion of the main body frame and a rear wheel shaft rotatably held at the other end, and a rear frame disposed on the rear frame and attached to the pedal shaft. A bevel gear that is coupled to the bevel gear that is coupled to the shaft of the rear wheel and a bevel gear that meshes with the bevel gear that is coupled to the shaft of the rear wheel are attached to both ends, and a drive shaft for transmitting the rotation of the pedal shaft to the rear wheel is provided. Between the rear frame and the body frame Bicycle coupled via suspension means. 4. The main body frame is foldable between a front portion to which a front wheel is attached and a pedal holding portion via a hinge means, and the hinge means is opened and closed when the hinge means is fixed and folded during use. The bicycle according to claim 3, further comprising fixing means for holding the bicycle. 5. The front wheel and the rear wheel are composed of a disk-shaped wheel having a shaft attached to the center thereof and a tire attached to the outer periphery of the wheel, and the surfaces opposite to the folding direction of the wheel are outside. The bicycle according to claim 2, wherein the bicycle has a curved surface that curves inward. 6. The bicycle according to claim 1, 2 or 3, wherein the front wheels are attached to the front frame via suspension means. 7. A main body frame rotatably pivotally supports a pipe portion of a front frame to which front wheels are attached to a standing pipe provided above a pedal holding portion, and a suspension means is provided above the pivotally supported pipe. The bicycle according to claim 4, wherein an upper pipe for mounting and for mounting a saddle is arranged. 8. The bicycle according to claim 3, wherein a gear box accommodating a pedal shaft and a bevel gear coupled to the pedal shaft is rotatably held by a pedal holding portion of a main body frame, and a rear frame is swingable. . 9. An axially supported pipe is provided with concave and convex portions at the upper and lower ends, vertical grooves are provided on the side surfaces, and bolt seats for adjusting the width of the vertical grooves are provided, and the pedal holding portion side and the upper pipe side are provided. 9. The bicycle according to claim 8, further comprising a corresponding fitting portion for the concave-convex portion and a pressing seat for pressing in a direction of fitting to the standing pipe.