JP2020006796A - Bicycle wheel detachment prevention device - Google Patents

Abstract

To provide a bicycle wheel detachment prevention device that can prevent rotation loss of an axle and improve wheel attachment workability.SOLUTION: A wheel detachment prevention device 100 includes a body 101, an axle insertion opening 103, a first engagement portion 105, and a second engagement portion 107. Even when force acts on the wheel detachment prevention device 100 in a tightening direction of a nut NT, an upper surface P107u of the second engagement portion 107 and an inner circumferential upper surface PASu of an axle attachment groove DS are brought into contact with each other, and thus the axle insertion opening 103 of the wheel detachment prevention device 100 can be prevented from moving and interfering with an axle AC. In other words, a rear wheel can be prevented from being detached while smooth rotation from the axle AC is maintained to reduce rotation loss.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a bicycle derailment prevention device for preventing a bicycle from derailing, and more particularly to a bicycle derailment prevention device that prevents a rotation loss of an axle and improves workability of wheel mounting.

  A conventional bicycle derailing prevention device will be described using a running motorcycle RB shown in FIG. The running bike RB is a kind of bicycle for children, and is a vehicle that gains propulsion by kicking the ground with feet. It has a structure in which driving mechanisms such as pedals, chains, and gears and braking mechanisms such as brake pads and brake levers are removed from a general bicycle structure (see Non-Patent Document 1).

As shown in FIG. 11, the running bike RB has a rear stay RS extending rearward from the down tube DT. The structure of the rear stay RS will be described with reference to FIG. The rear stay RS has an opening DA for a wheel release prevention device and an axle attachment opening AA at a rear end portion RSE where the rear wheel can be taken.

  The axle mounting groove DS is formed to be concave toward the inside from an axle mounting opening AA formed at the rear edge of the rear end portion RSE. That is, the axle mounting groove DS is formed in the rear end portion RSE as a groove shape with one end opened. The front end of the axle mounting groove DS corresponds to a proper axle arrangement position of the axle AC, which is the wheel axis of the rear wheel.

  The opening DA for a wheel removal prevention device is formed as a circular opening. The opening DA for the wheel removal prevention device is formed at a position shifted in the horizontal direction with respect to the axle mounting groove DS, specifically, in front of the axle mounting groove DS, and in a straight line with the axle mounting groove DS. .

  FIG. 13 shows the structure of the derailing prevention device 1. The wheel release prevention device 1 is attached to the running bike RB, and the rear wheel is attached. The wheel removal prevention device 1 has a main body 11, an axle insertion opening 13, and a first engagement portion 15.

  When the user intends to attach the rear wheel by using the derailing prevention device 1, first, the user assembles the rear wheel with the axle AC inserted. Then, as shown in FIG. 14, the axle AC is inserted into the axle mounting groove DS from the axle mounting opening AA, and is positioned at the axle arrangement position at the front end of the axle mounting groove DS.

  As shown in FIG. 15, the user positions the axle AC in the axle insertion opening 13 of the device for preventing wheel removal 1, pushes the device for preventing wheel removal 1 in the direction of the rear stay RS, and removes the first protrusion 15 from the device for preventing wheel removal. The device 1 is inserted into the opening DA, and the device 1 for preventing derailing is attached to a predetermined position. Further, as shown in FIG. 16, the washer WS is arranged so as to cover the derailing prevention device 1, and finally, the nut NT is tightened, and the derailing prevention device 1 is mounted.

Bean Bean Torpedo, “STRIDER” [online], searched June 10, 2018, Internet <URL: http://www.strider.jp/index.html>

  As described above, when the axle AC is first placed in the axle mounting groove DS and the rear wheel is mounted, the mounting of the rear wheel on the running bike RB has the following points to be improved. When tightening the nut NT, a force is applied in the nut tightening direction (generally, clockwise). For this reason, the derailing prevention device 1 rotates about the first engagement portion 15 in the nut tightening direction, and the center of the axle AC is deviated from the center of the axle insertion opening 13 of the derailing prevention device 1. Is concluded. Specifically, as shown in FIG. 17A, the axle insertion opening 13 of the device for preventing derailing 1 is arranged at the axle arrangement position, and the axle AC rotates smoothly without interference between the axle insertion opening 13 and the axle AC. 17B, the inner peripheral surface of the main body 11 forming the axle insertion opening 13 contacts the outer peripheral surface of the axle AC and is fastened in an interference state.

 For this reason, there is a point to be improved in that friction occurs between the wheel release prevention device 1 and the axle AC, and smooth rotation of the rear wheel is hindered. Such a rotation loss due to friction between the wheel-release prevention device 1 and the axle AC is particularly problematic in a race using the running motorcycle RB.

 Further, as described above, in the running bike RB in which the opening DA for the derailing prevention device is formed at a position shifted in the horizontal direction from the axle mounting position, the axle AC is removed before the axle AC is disposed in the axle mounting groove DS. In the case where the wheel prevention device 1 is to be mounted, the first engagement portion 15 of the wheel removal prevention device 1 is inserted into the wheel removal prevention device opening DA. In the engaged state, the axle insertion opening 13 is shifted from the axle attachment position of the axle attachment groove DS by rotating about the first engagement portion 15.

  For this reason, the axle insertion opening 13 is not shifted from the axle mounting position of the axle mounting groove DS, so that the derailing prevention device 1 is clamped so as to be fixed to the rear stay RS, and the rear tire RT is moved to a predetermined position. It is necessary to arrange and insert the axle AC into the axle insertion opening 13, and there is a point to be improved in that the operation becomes complicated, the operation takes time, and the workability is poor.

  Therefore, an object of the present invention is to provide a bicycle derailing prevention device that can prevent loss of rotation of an axle and can improve workability of wheel mounting.

  Means for solving the problems in the present invention and the effects of the invention will be described below.

  A bicycle derailment prevention device according to the present invention is a bicycle derailment prevention device for preventing a wheel of a bicycle from falling off a frame, wherein the axle insertion opening into which the axle of the wheel is inserted is engaged with the frame. The first engagement portion is configured to be in contact with the frame when the bicycle derailment prevention device attempts to move due to the fastening force by the fastening force of the mounting tool when the bicycle derailment prevention device is mounted on the frame. 2 engagement portions.

  With this, even when a force is applied in the fastening direction of the mounting tool when mounting the wheel, the second engagement portion and the frame abut, so that the axle insertion opening interferes with the inserted axle. Moving can be prevented. Thus, the wheels can be prevented from falling off without hindering the rotation of the axle.

  In the bicycle derailment prevention device according to the present invention, the second engagement portion is engaged with the frame even before the bicycle derailment prevention device attempts to move by the fastening force. .

  As a result, the bicycle disengagement prevention device engages with the frame at two places, so that the mounting position is fixed. Therefore, the axle insertion opening can be fixed to the axle proper mounting position without interference between the axle insertion opening and the axle.

  In the bicycle derailment prevention device according to the present invention, the second engagement portion is formed at a position corresponding to an axle mounting groove of the frame.

  Thus, simply by forming the second engagement portion, the rotation of the derailment prevention device due to the fastening force can be easily prevented, and the derailment prevention device can be easily fixed to an appropriate mounting position with respect to the axle. .

  In the bicycle derailment prevention device according to the present invention, the first engagement portion is formed at a position corresponding to an opening for the derailment prevention device of the frame.

  Thereby, the derailing prevention device can be easily engaged with the frame only by forming the first engagement portion.

  In the bicycle derailing prevention device according to the present invention, the bicycle is a running motorcycle.

Thus, in the running motorcycle, the prevention of rotation of the wheel-release preventing device by the fastening force, the fixing of the wheel-release preventing device to an appropriate mounting position on the axle, and the engagement of the wheel-release preventing device with the frame can be easily realized.

FIG. 1 is a perspective view showing a device for preventing wheel derailment 100 which is an embodiment of a device for preventing wheel derailment according to the present invention. It is a figure showing how to use derailing prevention device 100. It is a figure showing how to use derailing prevention device 100. It is a figure showing how to use derailing prevention device 100. It is a figure showing how to use derailing prevention device 100. It is a perspective view which shows the derailment prevention apparatus 200 which is another example of the derailment prevention apparatus which concerns on this invention. FIG. 6 is a diagram showing a method of using the wheel release prevention device 200. It is a perspective view which shows the derailment prevention apparatus 300 which is another example of the derailment prevention apparatus which concerns on this invention. It is a figure showing how to use derailing prevention device 300. It is a perspective view which shows the derailment prevention apparatus 400 which is another example of the derailment prevention apparatus which concerns on this invention. It is a figure showing running bike RB. It is a figure showing running bike RB. It is a figure showing running bike RB. It is a figure which shows the usage method of the conventional derailing prevention apparatus 1. It is a figure which shows the usage method of the conventional derailing prevention apparatus 1. It is a figure which shows the usage method of the conventional derailing prevention apparatus 1. It is a figure which shows the usage method of the conventional derailing prevention apparatus 1.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  A bicycle derailment prevention device 100 (hereinafter, referred to as a derailment prevention device 100) which is one embodiment of a bicycle derailment prevention device according to the present invention will be described. The derailing prevention device 100 is a device that holds an axle AC, which is a wheel axis of a tire, at a predetermined position of a bicycle.

1. As shown in FIG. 1, the device for preventing wheel removal 100 has a main body 101, an axle insertion opening 103, a first engagement portion 105, and a second engagement portion 107. .

  The main body 101 has a flat plate shape. The axle insertion opening 103 is arranged near the center of the main body 101. The axle insertion opening 103 is a circular opening for inserting the axle AC, and has a diameter larger than the outer shape of the axle AC.

  The first engagement portion 105 is formed at one end of the main body 101. The first engagement portion 105 has a rectangular parallelepiped shape. The first engagement portion 105 is arranged perpendicular to the main body 101 and is arranged so as to protrude from the main body 101. The first engagement portion 105 has a length L105 that is slightly smaller than the diameter of the derailing prevention device opening DA (see FIG. 8) formed at the rear end RSE of the rear stay RS.

The second engagement portion 107 is the same as the first engagement portion 105. However, the second engaging portion 107 is formed at one end of the main body 101 that is located opposite to the first engaging portion 105. The second engaging portion 107 has a length L107 slightly smaller than the diameter of the axle mounting groove DS (see FIG. 8) formed in the rear end RSE of the rear stay RS.

2. How to Use the Derailment Prevention Apparatus 100 The method of using the derailment prevention apparatus 100 shown in FIG. 1 will be described with reference to FIGS. The structure of the running bike RB is the same as the conventional one (see FIGS. 7 and 8).

  When attaching the rear wheel by using the derailing prevention device 100, the user first assembles the rear wheel with the axle AC inserted, as in the related art. Then, the axle AC is inserted into the axle mounting groove DS from the axle mounting opening AA, and is positioned at the axle arrangement position at the front end of the axle mounting groove DS (see FIG. 10).

  Then, as shown in FIG. 2, the user positions the axle AC in the axle insertion opening 103 of the derailing prevention device 100, pushes the derailing prevention device 100 in the direction of the rear stay RS, and puts the derailment prevention device 100 on the rear stay RS. Place along the direction. At this time, as shown in FIG. 3A, the first engagement portion 105 of the derailing prevention device 100 is inserted into the derailing prevention device opening DA. Thereby, the lower surface P105d of the first engagement portion 105 is engaged with the inner peripheral surface of the opening DA for the derailment prevention device.

At the same time, the user arranges the second engagement portion 107 of the device for preventing wheel removal 100 in the axle attachment groove DS. Thereby, as shown in FIG. 3A, the lower surface P107d of the second engaging portion 107 and the inner peripheral lower surface PASd of the axle mounting groove DS (see FIG. 3B) are engaged.

  As a result, the wheel removal prevention device 100 is engaged at two positions in the rear end portion RSE, and thus the position is fixed. As a result, as shown in FIG. 4, the axle insertion opening 103 can be fixed at an appropriate axle mounting position without interference between the axle insertion opening 103 and the axle AC.

Thereafter, as shown in FIG. 5, the user arranges the washer WS so as to cover the derailing prevention device 1, and finally tightens the nut NT to mount the derailing prevention device 1. Note that even if the nut is tightened and a force acts on the derailment preventing device 100 in the direction of tightening the nut NT, as shown in FIG. 3B, the upper surface P107u of the second engagement portion 107 and the axle mounting groove DS Since the peripheral upper surface PASu (see FIG. 3A) abuts, it is possible to prevent the axle insertion opening 103 of the derailing prevention device 100 from moving enough to interfere with the axle AC. That is, the rear wheels can be prevented from falling off while maintaining smooth rotation of the axle AC and reducing rotation loss.

[Other embodiments]
(1) Forming position of the first engaging portion 105: In the first embodiment, the first engaging portion 105 is disposed in the opening DA for the derailing prevention device at the rear end RSE of the rear stay RS. However, the present invention is not limited to the example as long as it engages with the rear end RSE of the rear stay RS. For example, a first engagement portion 205 may be formed at the upper end of the main body 201 as in the device for preventing derailing 200 shown in FIG. As shown in FIG. 7A, by engaging the first engagement portion with the upper surface PRSEu of the rear end RSE of the rear stay RS, the derailing prevention device 200 can be engaged with the rear end RSE of the rear stay RS. .

  (2) Shape of the first engagement portion 105: In the first embodiment, the first engagement portion 105 is formed in a rectangular parallelepiped shape, but inside the opening DA for the derailing prevention device at the rear end RSE of the rear stay RS. Is not limited to the example as long as it is disposed at the rear end and engages with the rear end RSE of the rear stay RS. For example, a first engagement portion 305 having a shape similar to that of the opening DA for a wheel-release preventing device may be formed, as in a wheel-release preventing device 300 shown in FIG.

  (3) Forming position of the second engaging portion 107: In the first embodiment described above, the second engaging portion 107 is arranged in the axle mounting groove DS of the rear end RSE of the rear stay RS. It is not limited to the example as long as it engages with the rear end RSE of the RS. For example, a second engagement portion 207 may be formed at the lower end of the main body 201 as in the device for preventing derailing 200 shown in FIG. As shown in FIG. 7B, by engaging the second engagement portion with the lower surface PRSEd of the rear end RSE of the rear stay RS, the rotation of the wheel removal prevention device 200 can be prevented.

  (3) Main body 101: In the first embodiment, the main body 101 is formed in a flat plate shape, but can be formed with the first engagement portion, the second engagement portion, and the axle insertion opening. If there is, it is not limited to the example. For example, the rear stay RS may have a shape similar to that of the rear end portion RSE, as in the derailing prevention device 200 shown in FIG. Thereby, the rear end RSE of the rear stay RS can be reinforced. In addition, since the wide main body 201 can be formed, the design can be improved by illustration display, decoration arrangement, and the like.

  (4) Place of dislocation prevention device: In the above-described first embodiment, the declination prevention device 100 is used for the rear stay RS of the running motorcycle RB. However, the present invention is not limited to the example. For example, it may be arranged at the lower end FFE (see FIG. 9) of the front fork FF.

  8, the axle insertion opening 303 into which the axle AC is inserted is located near the center of the flat plate-shaped main body 301 at a position corresponding to the opening DA for the derailing prevention device. The first engagement portion 305 and the second engagement portion 307 may be formed at a position where rotation due to tightening of the nut NT can be prevented.

  When the derailing prevention device 300 shown in FIG. 8 is used for the front fork FF of the running motorcycle RB, as shown in FIG. 9A, a nut is tightened, and a force acts on the derailing prevention device 300 in the direction of tightening the nut NT. Even if it does, since the inner surface of the second engagement portion 307 and the front surface PFFEf of the end portion FFE of the front fork FF abut, the axle insertion opening 303 of the derailment preventing device 300 is shifted in a direction to interfere with the axle AC. Can be prevented.

  When the derailing prevention device 300 shown in FIG. 8 is used for the front fork FF of the running motorcycle RB, as shown in FIG. 9B, there is no member that engages with the rear surface PFFEr of the end FFE of the front fork FF. . On the other hand, in the front fork FF, since the opening DA for the wheel-release preventing device is formed at a position shifted in the vertical direction with respect to the axle mounting groove DS, it is necessary to prevent the wheel from being removed before the axle AC is disposed in the axle mounting groove DS. Even when the device 1 is to be mounted, the derailment prevention device 300 inserted into the derailment prevention device opening DA is substantially engaged with the derailment prevention device opening DA, and is substantially axle mounting groove DS. , The work of attaching the front wheel to the front fork FF is relatively easy as compared to when attaching the rear wheel to the rear stay RS.

  Further, as in the case of the device for preventing de-wheeling 400 shown in FIG. 10, in addition to the first engaging portion 305 (see FIG. 8) and the second engaging portion 307, when the mounting position of the device for preventing de-wheeling 400 is fixed, The engaging portion 409 may be formed.

(5) Target of use of the device for preventing derailing: In the first embodiment described above, the device for preventing derailing 100 is used for the running bike RB. It is not limited to the example. For example, a normal bicycle may be used.

The bicycle derailment prevention device according to the present invention can be used for, for example, a running motorcycle.

REFERENCE SIGNS LIST 100 bicycle removal device 101 main body 103 axle insertion opening 105 first engagement portion P105d lower surface 107 second engagement portion P107u upper surface P107d lower surface 200 wheel removal prevention device 201 main body portion 205 first engagement portion 207 second engagement Part 300 Derailment prevention device 301 Main body part 303 Axle insertion opening 305 First engagement part 307 Second engagement part 400 Derailment prevention device 409 Third engagement part RB Running bike AC Axle RS Rear stay RSE Rear end part PRSEu Upper surface PRSEd Bottom surface DA Opening for derailment prevention device DS Axle mounting groove PASu Inner upper surface PASd Inner lower surface AA Axle mounting opening WS Washer NT Nut FF Front fork FFE Lower end PFFEf Front PFFEr Rear

Claims (5)

A bicycle wheeling prevention device for preventing a wheel of a bicycle from falling off a frame,
A first engagement portion that engages with the frame,
A second engagement portion that engages with the frame when the bicycle derailment prevention device attempts to move due to the fastening force by a fastening force of a fixture when the bicycle derailment prevention device is mounted on the frame;
Bicycle derailing prevention device having a. The bicycle derailment prevention device according to claim 1,
The second engagement portion includes:
Even before the bicycle derailment prevention device attempts to move due to the fastening force, it is engaged with the frame,
A device for preventing derailment. In the bicycle derailment prevention device according to claim 1 or 2,
The second engagement portion includes:
Being formed at a position corresponding to the axle mounting groove of the frame,
Bicycle derailing prevention device characterized by the above-mentioned. The bicycle derailing prevention device according to any one of claims 1 to 3,
The first engagement portion includes:
Being formed at a position corresponding to the opening for a derailment prevention device of the frame,
Bicycle derailing prevention device characterized by the above-mentioned. In any one of the bicycle dewheeling prevention devices according to claim 1,
The bicycle is
Running bike,
Bicycle derailing prevention device characterized by the above-mentioned.

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