JP7424858B2 - bicycle - Google Patents

Description

The present invention relates to a bicycle, and more particularly to a bicycle equipped with a center stand that allows the bicycle to be parked with less effort than conventional bicycles.

Generally, a bicycle is equipped with a stand for keeping the bicycle body upright when the bicycle is parked. The stand is often attached to the axle of the rear wheel, and for example, a single-legged stand and a double-legged stand that surrounds the rear wheel are widely known. Furthermore, for bicycles equipped with child seats and electrically assisted bicycles, center stands are also known, which are attached between the crankshaft and the rear wheel when the bicycle is viewed from the side, and have left and right legs integrally formed.

For example, in Patent Document 1, the appearance is sleek, and when the stand is in use, the distance between both feet on the ground can be widened to support the vehicle body in a stable state, while when the stand is not in use, the vehicle body can be supported so as not to get in the way. A center stand that allows both feet to be placed close to both sides of the vehicle body and prevents the hem of pants from getting caught while riding, and an electrically assisted bicycle using the center stand have been proposed.

Japanese Patent Application 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 assisted bicycle proposed in Patent Document 1, the distance from the rotation axis of the center stand to the ground contact part is long and the step bar is short, so when parking the bicycle, the force pushing down the stepping part is used as the force to lift the bicycle. cannot be converted efficiently. Therefore, it took a lot of effort to park the bicycle.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a bicycle equipped with a center stand that allows bicycle parking with less effort than conventional bicycles.

As a result of intensive studies to solve the above problems, the inventor of the present invention has found that by optimizing the mounting position of the center stand and the length of the predetermined parts that make up the center stand, it is possible to reduce the amount of labor required compared to the conventional method. The present invention was completed based on the discovery that bicycles can be parked in the parking lot.

That is, the bicycle of the present invention is a bicycle equipped with a rotatable double-legged center stand at the lower part of the bicycle body.
The rotation axis of the center stand is located below the crankshaft, and the center stand has a step bar on its leg that extends rearward when standing up, and
In a side view of the center stand, when the length from the rotation axis of the center stand to the ground contact part is X, and the length from the ground contact part to the free end of the step bar is Y, the following relational expression (1 ),
Y≧X (1)
satisfies the relationship expressed by
The step bar has a horizontal part that becomes substantially horizontal when the center stand is raised, and a curved part that connects the leg part and the horizontal part, and the step bar has a ground contact part of the leg part. The step bar extends from the rear of the leg in the bicycle traveling direction in the upright state, and is provided on the outer surface of the leg facing upward in the flipped up state. This is a characteristic feature.

In the bicycle of the present invention, the bicycle is equipped with a child seat behind the saddle, and when the horizontal length from the pivot axis of the center stand to the foremost part of the footrest of the child seat is L, the following relational expression is provided. (2),
L≧X (2)
It is preferable that the relationship expressed by is satisfied. The bicycle of the present invention is suitable for bicycles whose rear wheels have a diameter of 18 to 20 inches and electrically assisted bicycles.

According to the present invention, it is possible to provide a bicycle equipped with a center stand that can be parked with less effort than conventional bicycles. Since the bicycle of the present invention has a double-legged center stand, it is suitable for bicycles with relatively large body weights, such as electrically assisted bicycles, bicycles equipped with child seats, and bicycles carrying heavy objects.

1 is a schematic side view of a bicycle according to a preferred embodiment of the present invention, with the center stand erected; 1 is a schematic side view of a bicycle according to a preferred embodiment of the present invention, with the center stand flipped up; 1 is a schematic side view of a center stand of a bicycle in an upright state according to a preferred embodiment of the present invention. 1 is a schematic side view of a center stand of a bicycle according to a preferred embodiment of the present invention in a flipped up state; FIG. 1 is a schematic perspective view of a center stand of a bicycle in an upright state according to a preferred embodiment of the present invention.

Hereinafter, the bicycle of the present invention will be explained in detail using the drawings.
FIG. 1 is a schematic side view of a bicycle center stand according to a preferred embodiment of the present invention in an upright state, and FIG. 2 is a schematic side view of a bicycle center stand according to a preferred embodiment of the present invention. It is a schematic side view of the state which flipped up. The illustrated bicycle 1 is an electrically assisted bicycle equipped with a child seat, and the body frame 2 includes a head tube 3, a down tube 4 extending rearward and diagonally downward from the head tube 3, and a down tube 4 extending rearward and diagonally upward from the rear end of the down tube 4. a pair of left and right chain stays 6 extending rearward from near the lower end of the seat tube 5; and a pair of left and right seat stays 7 connecting the rear ends of both chainstays 6 and the upper part of the seat tube 5. , is equipped with. The lower end of the head tube 3 has a front fork 8 extending diagonally downward toward the front, and a front wheel 9 is rotatably mounted on the lower end of the front fork 8. Further, 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. Furthermore, a rear wheel 12 is rotatably attached to the rear end of the chainstay 6.

The bicycle 1 of the present invention includes a rotatable double-legged center stand 13 at the bottom of the vehicle body. In the illustrated example, 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 double-leg type center stand, compared to a single-leg type stand, the center stand 13 according to the bicycle 1 of the present invention is suitable for use on electrically assisted bicycles, bicycles equipped with child seats, bicycles carrying heavy objects, etc. Bicycles and the like whose bodies are relatively heavy can be parked in a stable state.

FIG. 3 is a schematic side view of a bicycle center stand according to a preferred embodiment of the present invention in an upright state, and FIG. 4 is a schematic side view of a bicycle center stand according to a preferred embodiment of the present invention in a flipped-up state. FIG. 5 is a schematic side view of a center stand of a bicycle 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 on a leg portion 13c that extends rearward when standing up. The illustrated center stand 13 includes a mounting part 13g attached below the chainstay 6, and the leg part 13c moves between the upright position and the flip-up position around the rotation shaft 13a provided on the mounting part 13g. Rotate. The leg portions 13c have ground contact portions 13e extending outward in the left-right direction of the bicycle 1 from the free ends of the two leg portions 13c. 13c are connected. Furthermore, the center stand 13 is provided with a step bar 13b on one leg 13c that transmits a pedal force for rotating the center stand 13 to the standing position to the center stand 13, and this step bar 13b has a structure that extends rearward when standing up. It becomes. The free end of the step bar 13b has a treading portion 13d that applies a treading force, thereby making it easier to lift the rear wheel 12 of the bicycle with the center stand 13, but this is not 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 axis 13a of the center stand 13 to the grounding part 13e is X, and the length from the grounding part 13e to the free end of the step bar 13b is X. When Y, the following relational expression (1),
Y≧X (1)
satisfies the relationship expressed by . In this way, by making the length of Y greater than or equal to the length of X, the bicycle 1 can be easily lifted up when the bicycle is parked due to the lever principle, and the effort required when parking the bicycle can be reduced.

In the bicycle 1 of the present invention, as illustrated, the step bar 13b has a horizontal portion 13ba that becomes substantially horizontal when the center stand 13 is upright, 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 grounding portion 13e of the leg portion 13c and the rotation shaft 13a, in other words, it is provided at the intermediate portion of the leg portion 13c. Further, the curved portion 13bb is provided on the outer surface facing upward of the leg portion 13c when the center stand 13 is 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-back direction. With this structure, even if the driver steps on the leg 13c of the center stand 13 that is flipped up when parking the bicycle 1, when the center stand 13 rotates, the driver's foot will be damaged. moves while sliding on the curved portion 13bb, and the driver's foot naturally moves to the stepping portion 13d. Therefore, the driver can smoothly park the bicycle.

In the bicycle 1 of the present invention, in a 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 the vertical distance from the rotation axis 13a of the center stand 13 to the crankshaft 14. It is preferable to set it as the length or more. By satisfying such a relationship, a sufficient length of the step bar 13b can be ensured, and the above-mentioned effects can be favorably obtained.

As described above, the bicycle 1 of the present invention is suitable for bicycles with relatively large body weights, such as electrically assisted bicycles, bicycles equipped with child seats, and bicycles carrying heavy objects. In the bicycle 1, interference between the center stand and other parts such as a child seat also poses a problem. To solve this 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 downward and outward. Due to the inclined surface of the mounting member, the center stand is attached to the mounting member so that their rotational axes intersect at the bottom, and when the center stand is flipped up, the distance between the ends of the legs narrows. structure to avoid such problems. However, the structure proposed in Patent Document 1 has a problem in that the mechanism for simultaneously rotating both legs 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 horizontal distance from the rotation axis 13a of the center stand 13 to the frontmost part of the footrest of the child seat 15 is When the length is L, the following relational expression (2),
L≧X (2)
The relationship expressed by may be satisfied. By setting L≧X, even when the center stand 13 is flipped up, the elongated step bar 13b can be prevented from interfering with the foot rest part of the child seat 15. In this manner, in the bicycle 1 of the present invention, interference between the center stand 13 and the child seat 15 can be prevented with a simple structure.

In addition, 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 child seats (front child seat) are also attached to the handlebars and handle stem, so that two children can be accommodated. It may also be configured so that it can be carried.

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 performance over bumps is improved, and by making the front wheel 9 larger in diameter, even when a front child seat is installed, the distance between the pedals and the child seat is reduced. Because the seat is wider, even large users will no longer have their feet touching the front child seat when pedaling, improving driving comfort. Furthermore, by making the front wheel 9 larger in diameter, the user has more options in terms of design. On the other hand, by making the rear wheels 12 smaller in diameter than the front wheels 9, the burden of loading and unloading a child onto and from the rear child seat 15 can be reduced. In addition, the center of gravity is lowered on the rear wheel 12 side, and it is possible to prevent wobbling while driving. 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 chain stay 6 can be positioned lower. As a result, the position of the rotating shaft 13a of the center stand 13 attached to the chainstay 6 can be positioned closer to the road surface, so the length X from the rotating shaft 13a of the center stand 13 to the ground contact part 13e can be shortened. Contribute to what you do. Although not shown in the drawings, a bicycle on which heavy objects can be loaded is of the type shown in FIGS. An example is a bicycle with a luggage basket installed.

In the bicycle 1 of the present invention, the rotation axis 13a of the center stand 13 is located below the crankshaft 14, and when 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 axis 13a of the center stand 13 to the grounding part 13e is X, and the length from the grounding part 13e to the free end of the step bar 13b is Y. , the following relational expression (1),
Y≧X (1)
It is only important that the relationship expressed by is satisfied, and known configurations can be adopted for other configurations.

For example, the center stand 13 can be attached by providing a hole in a plate member that clamps and fixes the chainstay 6 from above and below, or in a mounting bracket that is fixed to the chainstay 6 by welding or the like, and attaching it to the upper part of the center stand. Although it can be attached using the threaded portion 13f, it is not limited thereto. Further, in the illustrated example, the two legs 13c of the center stand 13 are integrally molded, but the invention is not limited to this. Furthermore, in the illustrated bicycle 1, a spring 13h is attached to the leg 13c of the center stand 13, and the displacement of the spring 13h with respect to the rotation axis 13a as the leg 13c rotates causes the spring 13h to move from the flip-up position to the upright position. The leg portion 13c of the center stand 13 is stopped at either position by the biasing force of the spring 13h.

Further, in the bicycle 1 of the present invention, the main driving force is transmitted by a power transmission means such as a chain or belt when the rider depresses the pedal and rotates the crank 17, and the driving force is transmitted to the rear wheel 12. The rear wheels 12 can be configured to be transmitted to drive the rear wheels 12. In the illustrated bicycle 1, an electric motor 18 is provided on the front wheel 9, and a battery 19 for supplying electric power to the electric motor 18 can be detachably attached to the rear of the seat tube 5. Furthermore, an electric motor that supplies auxiliary driving force to the front wheels 9 can be disposed inside the electric motor 18 .

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 Stepping portion 14 Crankshaft 15 Child seat (rear child seat)
16 Rear carrier 17 Crank 18 Electric motor 19 Battery

Claims (4)

A bicycle with a rotatable double-legged center stand at the bottom of the body.
The rotation axis of the center stand is located below the crankshaft, and the center stand has a step bar on its leg that extends rearward when standing up, and
In a side view of the center stand, when the length from the rotation axis of the center stand to the ground contact part is X, and the length from the ground contact part to the free end of the step bar is Y, the following relational expression (1 ),
Y≧X (1)
satisfies the relationship expressed by
The step bar has a horizontal part that becomes substantially horizontal when the center stand is raised, and a curved part that connects the leg part and the horizontal part, and the step bar has a ground contact part of the leg part. The step bar extends from the rear of the leg in the bicycle traveling direction in the upright state , and is provided on the outer surface of the leg facing upward in the flipped up state. Featured bicycles. When the bicycle is equipped with a child seat behind the saddle and the horizontal length from the rotation axis of the center stand to the frontmost part of the footrest of the child seat is L, the following relational expression (2) is satisfied.
L≧X (2)
The bicycle according to claim 1, which satisfies the relationship expressed by: The bicycle according to claim 1 or 2, wherein the diameter of the rear wheel is 18 to 20 inches. The bicycle according to any one of claims 1 to 3, which is an electrically assisted bicycle.

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