JP7370297B2 - Center stand and bicycle equipped with it - Google Patents

Description

The present invention relates to a center stand (hereinafter also simply referred to as a "stand") and a bicycle equipped with the same, and more particularly to a center stand whose angle when standing up can be adjusted with high accuracy and a bicycle equipped with the same.

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.

As for the technology related to stands, for example, Patent Document 1 discloses a side stand device for two-wheeled vehicles that allows the length of the legs to be adjusted using nuts and prevents a direct impact from acting on the length adjustment mechanism when operating the stand with the foot. is proposed. Further, Patent Document 2 proposes a bicycle stand vertical angle adjustment device that can adjust the angle of the stand using an angle adjustment plate having a thin wall on one side edge and a thick wall on the other side edge. . Specifically, this vertical angle adjustment device sandwiches the top and bottom of the horizontal frame between an upper plate and a lower plate near the pedal axis of the horizontal frame, and fixes the upper plate and the lower plate with bolts and nuts. At this time, the angle of the stand is adjusted by inserting an angle adjustment plate, which has a thin wall on one side and a thick wall on the other side, between the lower plate and the frame and passes through the bolt. .

Utility Model Publication No. 01-033486 Publication No. 48-022929

However, although the side stand device for a two-wheeled vehicle proposed in Patent Document 1 is a single-leg stand, although the length of the leg can be adjusted, the device cannot be applied to a center stand. In addition, the angle adjustment plate of the vertical angle adjustment device for a bicycle stand proposed in Patent Document 2 has the central square hole fitted onto the square shaft of the bolt so that the angle cannot be adjusted unless the angle adjustment plate is removed. It has become. Therefore, the angle of the angle adjustment plate is limited, and delicate angle adjustment cannot be performed.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a center stand whose angle when standing up can be adjusted with high precision, and a bicycle equipped with the center stand.

As a result of intensive studies to solve the above problem, the inventor of the present invention found that the above problem can be solved by using a predetermined fastening member and angle adjustment member that connect the bicycle and the center stand. , we have completed the present invention.

That is, the center stand of the present invention is a center stand that is attached to the lower part of a bicycle.
The center stand has a mounting part attached to a lower part of the bicycle, and the lower part of the bicycle and the mounting part of the center stand are connected to a spherical washer and a fastening member passing through a substantially central part of the spherical washer. connected via
The center stand further includes:
legs that rotate between a standing position and a flip-up position;
a holding part that includes a rotation center axis extending in a direction perpendicular to the rotation axis of the leg and rotatably holds the center stand on the bicycle;
has
The holding portion is characterized in that it holds a portion of the bicycle that extends in the front-rear direction.

The bicycle of the present invention is characterized by comprising the center stand of the present invention.

The bicycle of the present invention is suitable for a bicycle whose rear wheel has a diameter of 18 to 20 inches, and is particularly suitable for a power-assisted bicycle.

According to the present invention, it is possible to provide a center stand whose angle when standing up can be adjusted with high precision, and a bicycle equipped with the center stand. Since the center stand of the present invention is 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.

FIG. 2 is a schematic perspective view of a center stand according to a preferred embodiment of the present invention with its legs flipped up. FIG. 1 is an exploded perspective view of a center stand according to a preferred embodiment of the present invention. FIG. 2 is an exploded perspective view of a mounting portion of a center stand according to a preferred embodiment of the present invention. 1 is a schematic side view of a bicycle according to a preferred embodiment of the present invention, with the center stand of the present invention erected; FIG.

Hereinafter, the center stand of the present invention will be explained in detail using the drawings. FIG. 1 is a schematic perspective view of a center stand according to a preferred embodiment of the present invention with its legs flipped up, and FIG. 2 is a schematic perspective view of a center stand according to a preferred embodiment of the present invention with its legs flipped up. FIG. 3 is an exploded perspective view of a mounting portion of a center stand according to a preferred embodiment of the present invention, and FIG. 4 is an exploded perspective view of a mounting portion of a bicycle according to a preferred embodiment of the present invention. FIG. In the explanation, from the perspective of the driver sitting on the saddle 111, front and rear (left and right in FIG. 4) are the front and rear directions, right and left (the front and back sides of the page in FIG. 4) are the left and right directions, and up and down (the top and bottom of FIG. 4) ) will be explained assuming the vertical direction.

The stand 10 of the present invention has an attachment part 1 that is attached to a bicycle 100, and in the illustrated example, the legs 2 are rotatably attached to the attachment part 1. A lock portion 3 that holds (locks) the leg portion 2 in a flipped-up state is rotatably attached to a position different from the above. The leg portion 2 is rotatable around a rotation shaft 2a, and the lock portion 3 is rotatable around a rotation shaft 3a. Furthermore, in the illustrated example, a spring 4, which is a tension spring, is inserted between a spring mounting portion 3b provided on the upper side of the lock portion 3 and a spring mounting portion 2b provided approximately in the center of the leg portion 2. They are spanned and the two are connected. In the illustrated example, the lock portion 3 has a lever-like operating portion 3c, and is configured to rotate the lock portion 3 using this operating portion 3c.

As described above, the stand 10 of the present invention has the attachment part 1 that is attached to the bicycle 100, and this attachment part 1 includes the fastening member 1a (in the illustrated example, the bolt 1a) that attaches the stand 10 to the lower part of the bicycle 100. )have. The stand 10 of the present invention includes a plate member fixed to the bicycle 100 by sandwiching it from above and below, or a mounting bracket fixed to the chainstay 106 by welding or the like, with holes corresponding to the bolts 1a provided therein. It is attached to the lower part of the bicycle 100 with bolts 1a.

In the stand 10 of the present invention, the fastening member 1a passes through the spherical washer 5, which is made up of a concave washer 5a and a convex washer 5b, so that the bicycle and the mounting portion 1 of the stand 10 are connected. That is, since the stand 10 of the present invention is attached to the bicycle via the spherical washer 5, the angle of the stand 10 can be adjusted more accurately than before. Further, the spherical washer 5 has the advantage that it is easily available because it is not a dedicated part like the angle adjustment plate proposed in Patent Document 2. In the illustrated example, two spherical washers 5 are provided, but in the stand 10 of the present invention, the number of spherical washers 5 may be one or two or more.

In the stand 10 of the present invention, it is preferable that the lower part of the bicycle and the attachment part 1 are further attached via a plane washer 6, as shown in the figure. That is, between the lower part of the bicycle and the attachment part 1, it is preferable that the fastening member 1a passes through the flat washer 6 in addition to the spherical washer 5. By arranging the plane washer 6 in this manner, the height of the stand 10 (the distance between the upper surface of the mounting portion 1 and the lower surface of the mounting bracket, which will be described later) can be adjusted. In the stand 10 of the present invention, there is no particular restriction on the number of plane washers 6, and it is sufficient to use a number that allows the stand 10 to have an appropriate height. In the illustrated example, three plane washers 6 are arranged above and below the spherical washer 5.

The stand 10 of the present invention further includes a holding part 1b which has a rotation center axis extending in a direction perpendicular to the rotation axis 2a of the leg part 2 and which rotatably holds the center stand 10 on the bicycle. It is preferable that you do so. As described above, the stand 10 of the present invention is connected to the lower part of the bicycle 100 by the fastening member 1a such as the bolt 1a, but when the stand 10 is attached to the lower part of the bicycle with only the fastening member 1a, the stand 10 is not fastened. There are cases where the member 1a is rotated as an axis. Therefore, it is preferable that the stand 10 of the present invention is provided with such a holding portion 1b to prevent rotation of the stand 10 about the fastening member 1a.

Further, as described above, the stand 10 of the present invention is attached to a plate member fixed to the bicycle 100 by sandwiching the chainstay 106 from above and below, or to a mounting bracket fixed to the chainstay 106 by welding or the like. The plate member and the mounting bracket are provided with, for example, a portion extending in the front-rear direction of the bicycle 100, and this portion is held by the holding portion 1b of the stand 10. The illustrated stand 10 is swingable in the left-right direction of the bicycle 100 around the central rotation axis of the holding portion 1b, and can balance the left and right sides of the stand. Note that the holding portion 1b may hold a portion provided on the plate member or the mounting bracket that extends in the front-rear direction of the bicycle 100, or may hold the chain stay 106.

Next, an embodiment in which the stand 10 is attached to a mounting bracket of the bicycle 100 will be described in detail. To adjust the angle of the stand 10 with respect to the bicycle 100, first, the holding portion 1b of the stand 10 is attached to a portion of the mounting bracket extending in the longitudinal direction of the bicycle. A plane washer 6 and a spherical washer 5 are sandwiched between the mounting part 1 of the stand 10 and the mounting bracket of the bicycle 100, and the distance between the upper surface of the mounting part 1 and the lower surface of the mounting bracket is adjusted by the number of these. At this time, the flat surfaces of the flat washer 6 and the concave washer 5a are brought into contact, the concave spherical surface of the concave washer 5a and the convex spherical surface of the convex washer 5b are brought into contact, and the flat surface of the convex washer 5b and the flat surface (lower surface) of the mounting bracket are brought into contact with each other. bring it into contact.

Thereafter, the bolt 1a is passed through the mounting portion 1, the spherical washer 5, and the plane washer 6 by sandwiching the spherical washer 5 and the plane washer 6 between the head of the bolt 1a and the mounting bracket. Then, the bolt 1a is fastened to the mounting portion 1. At this time, the flat surface of the mounting bracket and the flat surface of the convex washer 5b are brought into contact, the convex spherical surface of the convex washer 5b is brought into contact with the concave spherical surface of the concave washer 5a, and the flat part of the concave washer 5a and the flat washer 6 are brought into contact with each other. bring it into contact.

By attaching the stand 10 to the bicycle 100 in this way, even if there is an angle between the mounting part 1 of the stand 10 and the mounting bracket of the bicycle 100 when the angle of the stand 10 is adjusted when standing up, The concave spherical surface of the concave washer 5a and the convex spherical surface of the convex washer 5b make it possible to create an angle between the flat part of the concave washer 5a and the flat part of the convex washer 5b, so that each flat part abuts without a gap. can. Therefore, by being able to securely fix the stand 10, the accuracy of the angle adjustment of the stand 10 can be improved. By appropriately changing the numbers of the spherical washers 5 and the planar washers 6, the stand 10 swings in the left-right direction with respect to the bicycle 100 around the rotation center axis of the holding part 1b. The angle can be adjusted with high precision.

The stand 10 of the present invention has a mounting part 1 that is attached to the lower part of the bicycle, and the bicycle and the mounting part 1 of the stand 10 are connected to each other by a spherical washer 5 and a fastening member 1a that passes through the approximate center of the spherical washer 5. The only important thing is that the connection is made through the interface, and known configurations can be used for other configurations. In the stand 10 of the present invention, a spring 4 is attached to the leg 2 of the stand 10, and depending on the displacement of the spring 4 with respect to the rotation axis 2a as the leg 2 rotates, the stand 10 can be placed in either a flip-up position or an upright position. Alternatively, the legs 2 of the stand 10 may be fixed by the biasing force of the springs 4, but as shown in the figure, in addition to the biasing force of the springs 4, when the legs 2 stand up and flip up, A locking portion 3 may be provided to fix the position of 2. Note that the stand 10 of the present invention may be of a double-legged type as shown in the figure, but may also be of a single-legged type.

For example, as shown in FIG. 2, the locking portion 3 of the stand 10 of the present invention is open at the top and recessed toward the bottom when the leg 2 is flipped up. The structure can be such that a recess 2d is provided, a cam follower 3d is disposed inside the lock part 3, and the cam follower 3d can be engaged with and detached from the recess 2d. That is, when the operating part 3c is rotated clockwise with the leg 2 flipped up, the cam follower 3d moves downward, and the cam follower 3d enters the recess 2d provided at the upper end of the leg 2. This restricts the rotation of the leg portion 2 and prevents the leg portion 2 from rotating toward the standing direction.

Next, the bicycle of the present invention will be explained.
FIG. 4 is a schematic side view of a bicycle according to a preferred embodiment of the present invention, with the center stand of the present invention erected. Bicycle 100 of the present invention is equipped with stand 10 of the present invention. In the bicycle 100 of the present invention, by using the stand 10 of the present invention as a double-legged stand, bicycles with relatively large body weights, such as electrically assisted bicycles, bicycles equipped with child seats, and bicycles carrying heavy objects, can be used. etc. can be parked in a stable condition.

The illustrated bicycle 100 includes a body frame 102, a head tube 103, a down tube 104 extending rearward and diagonally downward from the head tube 103, a seat tube 105 extending rearward and diagonally upward from the rear end of the down tube 104, and a seat tube 105. It includes a pair of left and right chain stays 106 that extend rearward from near the lower end, and a pair of left and right seat stays 107 that connect the rear ends of both chain stays 106 and the upper part of the seat tube 105. The lower end of the head tube 103 has a front fork 108 extending diagonally downward toward the front, and a front wheel 109 is rotatably attached to the lower end of the front fork 108. Further, a handle 110 is attached to the upper end of the head tube 103, and a saddle 111 is attached to the upper end of the seat tube 105. Furthermore, a rear wheel 112 is rotatably attached to the rear end of the chainstay 106.

A bicycle 100 according to the present invention includes a center stand 10 according to the present invention at a lower portion of a body frame 102. As long as the stand 10 of the present invention is attached to the lower part of the bicycle 100, there are no particular restrictions on its front and rear positions. Preferably, when the bicycle with the stand 10 in the upright position is viewed from the side, the center of gravity of the bicycle 100 is located forward of a vertical line passing through the ground contact portion of the stand 10. By attaching the stand 10 in such a position, the front wheels 109 come into contact with the ground when the bicycle is parked, making it possible to park the bicycle in a stable state. The mounting position of the center stand 10 is D1/D, where D1 is the horizontal distance from the axle of the front wheel 109 to the mounting position of the stand 10, and D2 is the horizontal distance from the mounting position of the stand 10 to the axle of the rear wheel 112. D2 is in the range of 2.9 to 4.0. By satisfying these conditions, it is possible to park the bicycle in a more stable state, and furthermore, it is possible to prevent interference between the stand 10 and the crank 113 or pedals while the bicycle is running.

Further, in the illustrated bicycle, a child seat 115 is attached to the rear carrier 114, but a configuration in which two children can be carried may also be adopted in which a child seat (front child seat) is also attached to the handlebars and handle stem. The illustrated bicycle 100 has a rear wheel 112 that has a smaller diameter than the front wheel 109, and has a structure that reduces the burden of loading and unloading a child on the attached child seat 115. Further, since the rear wheels 112 have a small diameter, the center of gravity is low on the rear wheels 112 side, and it is also possible to prevent wobbling while driving. Furthermore, since it is necessary to keep the total length of the bicycle 100 in the longitudinal direction below the legal length, by reducing the diameter of the rear wheel 112, the distance from the front end of the rear wheel 112 to the center of rotation of the crank 113 is increased. are doing. This improves the degree of freedom in installing the stand 10 in its mounting position.

Furthermore, in the illustrated bicycle 100, the diameter of the front wheel 109 is larger than the diameter of the rear wheel 112. By making the front wheel 109 larger in diameter than the rear wheel 112, performance over bumps is improved, and by making the front wheel 109 larger in diameter, even when a front child seat is installed, the distance between the pedals and the child seat is reduced. Since 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 109 larger in diameter, the user has more options in terms of design. In bicycle 100 of the present invention, rear wheel 112 preferably has a diameter of 18 to 20 inches. In the bicycle 100 of the present invention, the front wheel 109 is preferably 24 inches or less. Although not shown in the drawings, a bicycle on which heavy objects can be loaded is of the type shown in FIG. One example is a bicycle with a luggage basket.

In the bicycle 100 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 113, and the driving force is transmitted to the rear wheel 112. Accordingly, the rear wheels 112 are configured to be driven. In the illustrated bicycle, an electric motor 116 is provided on the front wheel 109, and a battery 117 that supplies electric power to the electric motor 116 can be detachably attached to the rear of the seat tube 105. Furthermore, an electric motor that supplies auxiliary driving force to the front wheels 109 can be disposed inside the electric motor 116. Therefore, by disposing the electric motor on the front wheel 109, the heavy electric motor that includes magnets and coils is disposed on the front side of the bicycle 100, so that the center of gravity can be moved further to the front side.

1 Mounting part 1a Fastening member 1b Holding part 2 Leg part 2a Rotating shaft 2b Spring mounting part 2d Recessed part 3 Lock part 3a Rotating shaft 3b Spring mounting part 3c Operating part 3d Cam follower 4 Spring 5 Spherical washer 5a Concave washer 5b Convex washer 6 Flat washer 10 Center stand (stand)
100 Bicycle 102 Body Frame 103 Head Tube 104 Down Tube 105 Seat Tube 106 Chain Stay 107 Seat Stay 108 Front Fork 109 Front Wheel 110 Handle 111 Saddle 112 Rear Wheel 113 Crank 114 Rear Carrier 115 Child Seat (Rear Child Seat)
116 Electric motor 117 Battery

Claims (4)

In the center stand attached to the bottom of the bicycle,
The center stand has a mounting part attached to a lower part of the bicycle, and the lower part of the bicycle and the mounting part of the center stand are connected to a spherical washer and a fastening member passing through a substantially central part of the spherical washer. connected via
The center stand further includes:
legs that rotate between a standing position and a flip-up position;
a holding part that includes a rotation center axis extending in a direction perpendicular to the rotation axis of the leg and rotatably holds the center stand on the bicycle;
has
The center stand is characterized in that the holding portion holds a portion of the bicycle that extends in the front-rear direction . A bicycle comprising the center stand according to claim 1 . 3. The bicycle according to claim 2 , wherein the rear wheel has a diameter of 18 to 20 inches. The bicycle according to claim 2 or 3, which is an electrically assisted bicycle.

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