JP2861079B2 - Bicycle fall prevention device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bicycle overturn prevention device which can prevent a steering wheel from turning right or left when a bicycle is parked or the like and can fix the steering wheel at any position. It is about.

2. Description of the Related Art When a bicycle is parked, particularly when a load is placed on a front basket, the handle often turns right or left, and the movement tends to cause the handle to easily fall to the turning side.
For this reason, a method for preventing the bicycle from tipping over by turning the steering wheel has been conventionally devised.

For example, a handle shaft provided with a detent portion and a key portion which comes into contact with the detent portion (Japanese Utility Model Laid-Open No. 58-1828)
No. 91).

Problems to be Solved by the Invention However, in such a conventional configuration, there is a disadvantage that the handle can be fixed only in a limited position, for example, in a state where the handle is turned to the left and right. In addition, since the handle is securely fixed, there is a disadvantage that the impact force applied to the handle and the handle fixing device when it falls is increased. Furthermore, if the driver forgets to release the handle, the driver cannot operate the handle, which is dangerous.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems, and provides a bicycle overturn prevention device that can fix a handle at any angular position and, when a force exceeding a certain level is applied, can rotate the handle by the force. To provide.

Means for Solving the Problems In order to solve the above-mentioned conventional problems, a bicycle overturn prevention device of the present invention includes a head pipe provided on a bicycle frame and a handle rotatably supported by the head pipe. A handle post that rotates integrally with the handle, a flange part that is integrally fixed to the head pipe and has corrugated irregularities on the outer peripheral surface, and can move forward and backward in a direction perpendicular to the center axis of rotation of the handle post. And a fixed piece having an uneven contact portion that rotates integrally with the handle post and engages with the unevenness of the outer peripheral surface of the flange portion, and a cam that pushes the fixed piece toward the rotation center axis of the handle post. And a biasing means disposed between the cam and the fixed piece to elastically bias the fixed piece.

Operation According to the above configuration, when the cam is rotated, the fixed piece is pushed out, and the fixed piece, the unevenness, and the unevenness of the flange portion are engaged. As a result, the movement of the fixed piece and the handle is braked. In this way, at any position on the outer periphery of the flange,
The handle can be fixed, but since it is pressed through a spring, when the rotational force exceeds a certain level, the fixing piece retreats, the engagement between the unevenness on the flange outer periphery and the fixing piece is released, the handle rotates, and the handle rotates. The nature is high.

Embodiment An embodiment will be described with reference to FIGS.

1 is a head pipe constituting a part of a frame, 2 is a front fork holding a front wheel, 3 is a handle (not shown).
Are integrally combined, and the handle post 3 and the front fork 2 are integrated and rotate in conjunction with each other. 4 is a cap nut, 5 is a bracket for attaching a headlight or a basket, 6 is an intermediate nut, 7 is a box-shaped cover, and 8 is a ball holder. The front fork 2 has a thread portion 2a on the outer periphery as shown in FIG. 9 and a groove 2b provided in the axial direction. Is fixed. The cover 7 has a projection provided on the inner peripheral portion.
Since 7a is fitted into the groove 2b of the front fork 2, it moves in conjunction with the handle.

Reference numeral 9 denotes a steel ball, and reference numeral 10 denotes a ball bearing integrated into the head pipe 1 by press fitting. The ball receiver 10 has a flange portion outer periphery 10a having an uneven shape. Numeral 11 denotes a fixing piece, as shown in FIG. 8, an abutting portion 11a having an uneven shape which meshes with the flange portion 10a of the ball receiver 10,
A sliding surface 11b guided on the inner surface of the cover 7, a concave portion 11c for accommodating an end of the coiled spring 12, and a receiving portion 1 for receiving the leaf spring 13.
Has 1d.

14 is a lower cover having screw holes 14a at both ends, a spring seat 14b at the front, and a receiving portion 14c for receiving the fixed piece 11 and the shaft 15 at the rear.
And is fixed to the cover 7 by screws 16.

The spring 12 has a recess 11c of the fixing piece 11 and a spring seat 1 of the lower cover 14.
4b, and always urges the fixing piece 11 in a direction away from the ball receiver 10.

The center of the shaft 15 is bent to form a cam 15a. 15b is an operation unit. The shaft 15 is fitted in the hole of the cover 7, but the operating part 15b is fitted in the elongated hole 7b, and the other is in the round hole 7c.
It is. The shaft 15 is formed by the receiving portion 14c of the lower cover
It rotates without coming off on the side. 17 is an E-ring.

A method of fixing the handle having this structure will be described below.
FIG. 2 shows a state in which the handle is fixed. When the operation portion 15b of the shaft 15 is lowered and the cam 15a is pressed against the spring 13, the fixing piece 11 slides toward the rotation center axis of the handle post, and the contact portion 11a having irregularities is formed with the flange portion outer periphery 10a. In close contact. If you try to rotate the handle in this state,
Rotational force is handle post 3- front pork 2- cover 7-
It is transmitted to the fixing piece 11-ball receiver 10-head pipe (frame) 1 and the handle cannot rotate. However, when a force equal to or greater than a certain torque is applied, the force of the spring 13 is overcome, the fixing piece 11 retreats, the engagement between the fixing piece 11 and the flange portion 10 is released, and the handle rotates.

As described above, according to the present invention, any position of the flange outer periphery 10a can be fixed by the fixing piece 11, so that the handle can select an arbitrary angle. FIG. 4 shows a state in which the handle is not fixed, the cam 15a does not press the spring 13, and the fixed piece 11 and the spring 13 are moved toward the shaft 15 by the spring 12. Axis 15 cam
Since 15a is bent, it rotates when pressed by the spring 13,
The operation unit 15b stands upright and is in a stable state. Even during the operation of the cam, the cam 15a moves over the center of rotation and is stable in a state of being in contact with the inner surface of the cover 7.

10 to 13 show another embodiment. In this example,
A U-shaped spring 19 that pushes the fixing piece 18 toward the ball receiving side is attached to the end of the fixing piece 18 that engages with and fixes the same. Meanwhile, the spring
The shaft 20 having the cam 20a for moving the cover 19 includes the cover 7 and the lower cover 1
It is pivoted on 4. The operating portion 20b of the shaft 20 is fixed by a nut 21 at the upper end prism portion of the shaft 20.

In this configuration, the cam 20a is operated by operating the operation section 20b.
The fixing piece 18 slides according to the eccentric position of the handle, and the handle can be fixed and released. Since the cam 20a is square, it is stable when locked and free.

Effect of the Invention As described above, the present invention has a configuration in which the fixing piece that rotates together with the handle is pressed against the flange portion by the cam via the spring, so that the handle can be fixed at any position and the release can be performed. Even if the driver forgets to run the vehicle, the steering wheel is not completely fixed, so that the device is not broken and the user is safe. Further, it is possible to provide an overturn prevention structure that has few constituent parts, is inexpensive, and has a high practical effect.

[Brief description of the drawings]

1 is a longitudinal sectional view of an overturn prevention device according to an embodiment of the present invention, FIG. 2 is a sectional view taken along the line II-II 'of FIG. 1, FIG. 3 is a plan view of a cover, and FIG. FIG. 5 is a cross-sectional view of a main part, FIG. 6 is a plan view of the lower cover 15, FIG. 7 is a vertical cross-sectional view of the same, FIG. 9 is a partial perspective view of the front fork, FIG. 10 is a plan view of another embodiment, FIG. 11 is a cross-sectional view at the time of its operation, FIG. 12 is a cross-sectional view at the time of unlocking, and FIG. It is a longitudinal cross-sectional view at the time of lock. 1 ... head pipe, 2 ... front fork, 7 ... cover,
10… Ball bearing, 11,18 …… Fixed piece, 12,13,19 …… Spring, 14
…… Bottom cover, 15,20 …… Shaft, 15a, 20a …… Cam.

Continuation of the front page (56) References JP-A-53-34231 (JP, A) JP-A-58-133980 (JP, A) JP-A-63-69693 (JP, U) JP-B-56-48346 (JP, A) , B2) (58) Field surveyed (Int. Cl. ⁶ , DB name) B62K 21/00 B62H 5/06

Claims (1)

(57) [Claims] 1. A head pipe provided on a bicycle frame, a handle post rotatably supported by the head pipe and rotating integrally with a handle, and an outer periphery integrally fixed to the head pipe, A flange portion having corrugated irregularities formed on a surface thereof, which is movable back and forth in a direction perpendicular to a rotation center axis of the handle post, and which rotates integrally with the handle post to form an outer peripheral surface of the flange portion. A fixing piece having an abutting portion having an uneven shape that engages with the unevenness; a cam that pushes the fixing piece toward a rotation center axis of the handle post; and a cam that is disposed between the cam and the fixing piece and is fixed. A device for preventing a bicycle from falling over, comprising a biasing means for biasing the piece elastically.