JP2021130414A - bicycle - Google Patents

Abstract

To provide a bicycle equipped with a center stand, which can be parked with a reduced labor compared with a conventional one.SOLUTION: In a bicycle equipped with a rotatable biped center stand 13 under a bicycle body, in the side view of the center stand 13, a turning shaft 13a of the center stand 13 is located at a position lower than a crank shaft 14, and the center stand 13 has a step bar 13b extending backward when raised on a leg part 13c. When a length from the turning shaft 13a of the center stand 13 to a grounding part 13e is X and a length from the grounding part 13e to a free end of the step bar 13 is Y, the relation represented by the following relational expression (1): Y≥X (1) is satisfied.SELECTED DRAWING: Figure 3

Description

The present invention relates to a bicycle, and more particularly to a bicycle provided with a center stand, which can be parked with less labor than before.

Generally, a bicycle is provided with a stand for keeping the vehicle body upright when the bicycle is parked. The stand is often attached to the axle of the rear wheel. For example, a one-legged stand or a two-legged stand surrounding the rear wheel is widely known. In addition, in bicycles equipped with child seats and electrically power assisted bicycles, a center stand is also known, which is attached between the crankshaft and the rear wheel when the bicycle is viewed from the side, and the left and right legs are integrally molded.

For example, in Patent Document 1, the appearance is smart, and when the stand is used, the ground contact distance between both feet can be widened to support the vehicle body in a stable state, but when the stand is not used, it does not get in the way. A center stand that can keep both feet close to both sides of the vehicle body and prevent the hem of the trousers from getting caught while driving, and an electrically assisted bicycle using this have been proposed.

Japanese Unexamined Patent Publication No. 9-207846

When parking a bicycle equipped with a center stand, it is necessary to lift the rear wheel of the bicycle with the center stand. However, in the electrically power assisted bicycle proposed in Patent Document 1, since the length from the rotation axis of the center stand to the ground contact portion is long and the step bar is short, the force pushing down the stepping portion is used as the force to lift the bicycle when the bicycle is parked. It cannot be converted efficiently. Therefore, it took a lot of labor to park the bicycle.

Therefore, an object of the present invention is to provide a bicycle provided with a center stand, which can be parked with less labor than before.

As a result of diligent studies to solve the above problems, the present inventor has made appropriate the mounting position of the center stand and the length of a predetermined portion constituting the center stand, thereby requiring less labor than before. It was found that the bicycle could be parked at, and the present invention was completed.

That is, the bicycle of the present invention is a bicycle provided with a rotatable double-legged center stand at the bottom of the vehicle body.
The rotation shaft of the center stand is located below the crankshaft, and the center stand has a step bar on the leg that extends rearward when standing up.
In the side view of the center stand, when the length from the rotation axis of the center stand to the ground contact portion is X and the length from the ground contact portion to the free end of the step bar is Y, the following relational expression (1) ),
Y ≧ X (1)
It is characterized by satisfying the relationship represented by.

In the bicycle of the present invention, it is preferable that the step bar has a horizontal portion that becomes substantially horizontal when the center stand stands up, and a curved portion having a curved shape that connects the leg portion and the horizontal portion. Further, when the bicycle is provided with a child seat behind the saddle and the horizontal length from the rotation axis of the center stand to the frontmost portion of the footrest portion of the child seat is L, the following relational expression (2),
L ≧ X (2)
It is preferable to satisfy the relationship represented by. The bicycle of the present invention is suitable for a bicycle having a rear wheel diameter of 18 to 20 inches and an electrically assisted bicycle.

According to the present invention, it is possible to provide a bicycle provided with a center stand, which can be parked with less labor than before. Since the bicycle of the present invention is a two-legged center stand, it is suitable for a bicycle having a relatively large body weight such as an electrically assisted bicycle, a bicycle equipped with a child seat, and a bicycle carrying a heavy object.

It is a schematic side view of the state which the center stand of the bicycle which concerns on one preferred embodiment of this invention stands upright. It is a schematic side view of the state in which the center stand of the bicycle which concerns on one preferred embodiment of this invention is flipped up. It is a schematic side view in the upright state of the center stand of the bicycle which concerns on one preferred embodiment of this invention. It is a schematic side view in the flip-up state of the center stand of the bicycle which concerns on one preferred embodiment of this invention. It is the schematic perspective view in the standing state of the center stand of the bicycle which concerns on one preferred embodiment of this invention.

Hereinafter, the bicycle of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a schematic side view of a state in which the center stand of the bicycle according to the preferred embodiment of the present invention is erected, and FIG. 2 is a center stand of the bicycle according to the preferred embodiment of the present invention. It is a schematic side view of the state which is flipped up. The illustrated bicycle 1 is an electrically assisted bicycle provided with a child seat, and the body frame 2 includes a head tube 3, a down tube 4 extending diagonally downward from the head tube 3, and an obliquely upward rearward from the rear end of the down tube 4. A seat tube 5 extending to the rear, a pair of left and right chain stays 6 extending rearward from the vicinity of the lower end of the seat tube 5, and a pair of left and right seat stays 7 connecting the rear ends of both chain stays 6 and the upper part of the seat tube 5. , Is equipped. A front fork 8 extending diagonally forward and downward is provided at the lower end of the head tube 3, and a front wheel 9 is rotatably mounted on the lower end of the front fork 8. A handle 10 is attached to the upper end of the head tube 3, and a saddle 11 is attached to the upper end of the seat tube 5. Further, a rear wheel 12 is rotatably attached to the rear end of the chain stay 6.

The bicycle 1 of the present invention is provided with a rotatable double-legged center stand 13 at the lower part of the vehicle body. In the illustrated example, in the center stand 13, the rotation shaft 13a of the center stand 13 is located below the crankshaft 14, and specifically, the center stand 13 is attached to the lower part of the chain stay 6. Since the center stand 13 according to the bicycle 1 of the present invention is a two-legged center stand, it is more like an electrically assisted bicycle, a bicycle equipped with a child seat, or a bicycle loaded with heavy objects, as compared with a one-legged stand. Bicycles with a relatively large body weight can be parked in a stable state.

FIG. 3 is a schematic side view of the bicycle center stand according to the preferred embodiment of the present invention in an upright state, and FIG. 4 is a flip-up state of the bicycle center stand according to the preferred embodiment of the present invention. FIG. 5 is a schematic side view and FIG. 5 is a schematic perspective view of a bicycle center stand according to a preferred embodiment of the present invention in an upright state. In the bicycle 1 of the present invention, the center stand 13 is located below the crankshaft 14, and further has a step bar 13b extending rearward when standing up on the leg portion 13c. The illustrated center stand 13 includes a mounting portion 13g to be mounted below the chain stay 6, and the leg portion 13c is placed between the upright position and the flip-up position with the rotation shaft 13a provided on the mounting portion 13g as the center. Rotate. The leg portion 13c has a ground contact portion 13e extending outward in the left-right direction of the bicycle 1 from the free ends of the two leg portions 13c, and the two legs are located at the opposite ends of the ground contact portion 13e. 13c are connected. Further, the center stand 13 is provided with a step bar 13b on one leg 13c that transmits the pedaling force for rotating the center stand 13 to the standing position to the center stand 13, and the step bar 13b has a structure extending rearward when standing. It has become. The free end of the step bar 13b has a stepping portion 13d for applying a treading force, which facilitates the work of lifting the rear wheel 12 of the bicycle with the center stand 13, but is limited to this. It's not a thing.

In the bicycle 1 of the present invention, when the center stand 13 is viewed from the side, the length from the rotation shaft 13a of the center stand 13 to the ground contact portion 13e is X, and the length from the ground contact portion 13e to the free end of the step bar 13b. When Y, the following relational expression (1),
Y ≧ X (1)
Satisfy the relationship represented by. As described above, by setting the length of Y to the length of X or more, the bicycle 1 can be easily lifted when the bicycle is parked by the principle of the lever, and the labor during the bicycle parking can be reduced.

In the bicycle 1 of the present invention, as shown in the figure, the step bar 13b has a horizontal portion 13ba that becomes substantially horizontal when the center stand 13 stands up, and further has a curved shape that connects the leg portion 13c and the horizontal portion 13ba. It is preferable to have a curved portion 13bb. In the illustrated example, the curved portion 13bb is provided between the ground contact portion 13e of the leg portion 13c and the rotation shaft 13a, in other words, is provided in the intermediate portion of the leg portion 13c. Further, the curved portion 13bb is provided on the outer surface of the center stand 13 facing upward of the leg portion 13c in the flipped-up state. When the center stand 13 is in the upright state, the curved portion 13bb extends in the vertical direction and the front-rear direction. With such a structure, when the bicycle 1 is parked, even if the driver steps on the leg portion 13c of the center stand 13 in a flipped-up state, when the center stand 13 rotates, the driver's foot Will move while sliding on the curved portion 13bb, and the driver's foot will naturally move to the treading portion 13d. Therefore, the driver can smoothly park the bicycle.

Further, in the bicycle 1 of the present invention, in the side view of the center stand 13, the length Y from the ground contact portion 13e to the free end of the step bar 13b is set to be vertical from the rotation shaft 13a of the center stand 13 to the crank shaft 14. It is preferably longer than the length. By satisfying such a relationship, a sufficient length of the step bar 13b can be secured, and the above-mentioned effect can be satisfactorily obtained.

As described above, the bicycle 1 of the present invention is suitable for a bicycle having a relatively large body weight such as an electrically assisted bicycle, a bicycle equipped with a child seat, and a bicycle carrying a heavy object, but is provided with a center stand 13. In the bicycle 1, interference between the center stand and other parts such as a child seat is also a problem. To deal with such a problem of interference between the center stand and other parts, for example, in the bicycle proposed in Patent Document 1, the left and right legs of the center stand are opened outward downward. Due to the inclined surface of the inclined mounting member, the respective rotation axes are attached to the mounting member so as to intersect at the bottom, and when the center stand is flipped up, the distance between the ends of both legs is narrowed. This configuration avoids such problems. However, the structure proposed in Patent Document 1 has a problem that the mechanism for rotating both legs at the same time becomes complicated.

Therefore, in the bicycle 1 of the present invention in another embodiment (not shown), when the child seat 15 is installed behind the saddle 11, the rotation shaft 13a of the center stand 13 is horizontal to the frontmost portion of the footrest portion of the child seat 15. When the length is L, the following relational expression (2),
L ≧ X (2)
The relationship represented by may be satisfied. By setting L ≧ X, it is possible to prevent the lengthened step bar 13b from interfering with the footrest portion of the child seat 15 even when the center stand 13 is flipped up. As described above, the bicycle 1 of the present invention has a simple structure and can prevent the center stand 13 and the child seat 15 from interfering with each other.

In the illustrated example, the bicycle 1 of the present invention has a child seat (rear child seat) 15 attached to the rear carrier 16, but a child seat (front child seat) is also attached to the handlebar and the handle stem, and two children are attached. It may be configured to be placed.

Further, in the illustrated bicycle 1, the diameter of the front wheel 9 is larger than the diameter of the rear wheel 12. By making the front wheel 9 larger in diameter than the rear wheel 12, the step running performance is improved, and by making the front wheel 9 larger in diameter, the distance between the pedal and the child seat is improved even when the front child seat is attached. Because of the wider size, even a large user will not have his feet in contact with the front child seat when pedaling, improving driving comfort. Further, by making the front wheel 9 a large diameter, the user's choices will increase in terms of design. On the other hand, by making the diameter of the rear wheel 12 smaller than that of the front wheel 9, it is possible to reduce the burden of loading and unloading the child on the rear child seat 15. In addition, the rear wheel 12 side has a low center of gravity, which can prevent wobbling during traveling. In the bicycle 1 of the present invention, the diameter of the rear wheel 12 is preferably 18 to 20 inches. In the bicycle 1 of the present invention, the front wheel 9 is preferably 24 inches or less. By reducing the diameter of the rear wheel 12, the position of the chain stay 6 can be arranged downward. As a result, the position of the rotating shaft 13a of the center stand 13 attached to the chain stay 6 can be set closer to the road surface, so that the length X from the rotating shaft 13a of the center stand 13 to the ground contact portion 13e can be shortened. Contribute to doing. Although not shown, the bicycle on which a heavy object is loaded is the type of bicycle shown in FIGS. 1 and 2, and the heavy object is placed on the upper part of the rear wheel 12 in the horizontal portion of the rear carrier 16 instead of the child seat 15. An example is a bicycle equipped with a loading basket.

In the bicycle 1 of the present invention, when the rotation shaft 13a of the center stand 13 is located below the crank shaft 14 and the center stand 13 is viewed from the side, the center stand 13 has a step bar 13b extending rearward when standing up. When the length from the rotation shaft 13a of the center stand 13 to the ground contact portion 13e is X, and the length from the ground contact portion 13e to the free end of the step bar 13b is Y, which is provided on the leg portion 13c. , The following relational expression (1),
Y ≧ X (1)
It is only important to satisfy the relationship represented by, and known configurations can be adopted for other configurations.

For example, as a method of mounting the center stand 13, a hole is provided in a plate member fixed by sandwiching the chain stay 6 from above and below, or in a mounting bracket fixed to the chain stay 6 by welding or the like, and is provided on the upper part of the center stand. It can be attached by the screwed portion 13f, but the present invention is not limited to this. Further, in the illustrated example, the two legs 13c of the center stand 13 are integrally molded, but the present invention is not limited to this. Furthermore, in the illustrated bicycle 1, a spring 13h is attached to the leg portion 13c of the center stand 13, and the spring 13h is displaced with respect to the rotation shaft 13a due to the rotation of the leg portion 13c, so that the spring 13h stands up at the flip-up position. At any of the positions, the leg portion 13c of the center stand 13 is stopped by the urging force of the spring 13h.

Further, in the bicycle 1 of the present invention, when the driver steps on the pedal with his / her foot to rotate the crank 17, the main driving force is transmitted by a power transmitting means such as a chain or a belt, and the driving force is transmitted to the rear wheels 12. It can be configured to be transmitted and drive the rear wheels 12. In the illustrated bicycle 1, an electric motor 18 is provided on the front wheels 9, and a battery 19 that supplies electric power to the electric motor 18 can be detachably attached to the rear of the seat tube 5. Further, inside the electric motor 18, an electric motor that supplies an auxiliary driving force to the front wheels 9 can be arranged.

1 Bicycle 2 Body frame 3 Head tube 4 Down tube 5 Seat tube 6 Chain stay 7 Seat stay 8 Front fork 9 Front wheel 10 Handle 11 Saddle 12 Rear wheel 13 Center stand 13a Rotating shaft 13b Step bar 13c Leg 13d Treading part 14 Crank shaft 15 Child seat (rear child seat)
16 Rear carrier 17 Crank 18 Motor 19 Battery

Claims (5)

In a bicycle equipped with a rotatable double-legged center stand at the bottom of the vehicle body
The rotation shaft of the center stand is located below the crankshaft, and the center stand has a step bar on the leg that extends rearward when standing up.
In the side view of the center stand, when the length from the rotation axis of the center stand to the ground contact portion is X and the length from the ground contact portion to the free end of the step bar is Y, the following relational expression (1) ),
Y ≧ X (1)
A bicycle characterized by satisfying the relationship represented by. The bicycle according to claim 1, wherein the step bar has a horizontal portion that becomes substantially horizontal when the center stand stands up, and a curved portion having a curved shape that connects the legs and the horizontal portion. When the bicycle is provided with a child seat behind the saddle and the horizontal length from the rotation axis of the center stand to the frontmost portion of the footrest portion of the child seat is L, the following relational expression (2),
L ≧ X (2)
The bicycle according to claim 1 or 2, which satisfies the relationship represented by. The bicycle according to any one of claims 1 to 3, wherein the diameter of the rear wheel is 18 to 20 inches. The bicycle according to any one of claims 1 to 4, which is an electrically power assisted bicycle.

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