JP2000159167A - Bicycle steering device - Google Patents

Abstract

(57) [Problem] To simplify a structure of a steering device for turning a steering wheel so that a deflection operation and a return operation to a normal position can be easily performed, and an operation of adjusting a height of the steering wheel can be performed. . A pair of left and right stop pins (9) that elastically enter and exit are provided on the side surface of a handle post (4), and the heads (9 ') of the pins are hooked on the upper end of a fork stem (2) at a deflection angle position and a normal position, respectively. A split groove 10 for stopping is provided, and the handle post 4 is fixed to the fork stem 2 or opened rotatably by tightening and loosening a tightening nut 6 screwed to the upper end of the fork stem 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bicycle for which a steering wheel is rotatable with respect to a steering wheel post so that the steering wheel can be fixed at an angular position parallel to the vehicle body when parking a bicycle. The turning device of the steering wheel is characterized in that the structure of the turning device is simply formed so that the turning operation can be easily performed.

[0002]

2. Description of the Related Art A steering wheel turning device of this kind, in which a handle post is fixed to a fork stem so that it can be turned in a direction parallel to a vehicle body to reduce a space width of a bicycle when placed in a bicycle parking lot. For example, there is Japanese Patent Application Laid-Open No. Hei 9-310249 in the prior application of the present applicant in addition to Japanese Utility Model Laid-Open No. Hei 4-81894.

[0003]

The above-mentioned prior art devices each have a steering wheel turning mechanism and a locking mechanism so that the bicycle can be locked at the time of turning. Therefore, the structure becomes complicated, and the turning operation is performed. However, there was a drawback that it became complicated. Therefore, it has been a problem to be solved in this type of device to simplify the structure of the turning device of the bicycle handle so as to facilitate the turning operation.

[0004]

SUMMARY OF THE INVENTION Accordingly, the present invention provides a pair of left and right holes penetrating in the diametric direction on the side surface of a handle post. Providing a pair of left and right stop pins that appear and disappear, at the upper end of the fork stem, at intervals corresponding to the angle difference between the normal position and the deflection position of the handle, and cut in the length direction from the upper end of the fork stem, A split groove for fitting the head of the stop pin is provided, and a tightening nut provided with an operation lever on the outer surface is screwed into the upper end of the fork stem, and the tightening nut tightens the handle post so as to always connect with the handle post. Provide for the Hawk stem to rotate together. Also, when turning the handle, loosen the tightening nut to allow the handle post to rotate, and at the turning position of the handle post, hook the head of the stop pin into the locking groove at the deflection position of the fork stem. ,
An object of the present invention is to provide a turning device for a bicycle handle in which a handle post is fixed integrally with a fork stem at a deflection angle position by tightening a tightening nut.

As described above, according to the present invention, the handle post and the fork stem can be integrally fixed or rotatably opened by the tightening and loosening operation of the tightening nut. The return operation becomes extremely easy and the structure of the turning device is simplified.

In the turning device of the present invention, the angle between the normal position and the deflection position of the handle is secured by fitting the head of the stop pin provided on the handle post and the split groove provided on the fork stem. So that the safe use of the bicycle is not impaired. The present invention has solved the above-mentioned problems as described above.

In the turning device of the present invention, the handle post and the fork stem are provided with locking holes common to each other at the deflection angle position of the handle post, and the two locking holes are provided at the upper part of the head pipe. If the locking is performed by the locking rod, the steering wheel can be locked at the deflection angle position following the deflection operation in a bicycle parking lot or the like, and the turning device of the present invention can be provided with an anti-theft function.

Further, the turning device of the present invention enables the handle to be locked following the deflection operation as described above, and the locking hole provided on the fork stem side is formed to be vertically long. When the height of the handle is adjusted by changing the fitting length between the handle and the handle post, the function of locking the handle at the deflection angle position is not impaired.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. In the figure, 1 is a head pipe constituting a front part of a vehicle body, 2 is a fork stem which penetrates the head pipe 1 and is rotatably supported by bearings 3 provided above and below the pipe, and 4 is a fork stem. 2, a handle post fitted to the upper end of the handle post 4 so as to be rotatable from the upper end of the handle post 4;
It is a fastening nut screwed on the upper part of.

As shown in FIGS. 2 and 3, the handle post 4 has a pair of left and right holes 7 penetrating in the diameter direction on the side surface of the fitting portion with the fork stem 2. And a pair of left and right stop pins 9 which are biased by a spring 8 to elastically protrude and retract outward.

On the other hand, the fork stem 2 is cut into an upper portion in a slit shape at an interval corresponding to the angle difference between the normal position and the deflection position of the handle 5 and along the length direction from the upper end of the stem 2. A split groove 10 is provided, and a split groove 1
The handle post 4 and the handle 5 are held at the normal position and the deflected position by fitting the head 9 'of the stop pin 9 into the position 0.

The aforementioned fork stem 2 and handle post 4
Are always fixed integrally with each other by tightening a tightening nut 6 screwed from the upper end of the fork stem 2 to a screw portion 11 provided on the outer periphery of the stem, and are provided so as to rotate integrally.

The tightening by the nut 6 is caused by the inward bending of the upper portion of the fork stem 2 excluding the slit 10 provided in a slit shape along the length direction from the upper end of the fork stem 2. Therefore, when the tightening nut 6 is loosened, the fork stem 2 and the handle post 4 are released from the tightening, and can freely rotate with each other.

From the state shown in FIG. 2, after raising the operation lever 12 provided outside the tightening nut 6 to the imaginary line position and turning it in the loosening direction, when the handle 5 and the handle post 4 are rotated, the rotation The force once causes the stop pin 9 to sink into the hole 7 against the spring 8, but when the stop pin 9 is rotated by approximately 90 °, the head 9 'of the pin 9 automatically engages with the split groove 10 provided at the deflected position or the normal position. The handle 5 is held at a predetermined angular position.

The handle 5 held at the predetermined deflection angle position or the normal position as described above is further securely tightened with the tightening nut 6, so that the handle post 4 and the fork stem 2 are joined integrally. However, when the bicycle is in the deflected angle position, the width of the bicycle is minimized, and the bicycle can be safely driven when used. Further, in this deflection device, the height of the handle 5 can be easily adjusted by loosening the tightening nut 6 and sliding the handle post 4 released from tightening up and down.

In this embodiment, as shown in the drawings,
Attach a lock 13 to the upper part of the head pipe 1,
By operating the lock rod 14 controlled by the locking operation and the unlocking operation of the handle 3, the handle post 4 and the handle 5 at the deflection angle position can be locked integrally with the fork stem 2.

That is, in the embodiment, as shown in FIGS. 2 and 3, locking holes 15 and 16 common to the handle post 4 and the fork stem 2 are provided, and the locking operation of the lock 13 is performed in the deflected position. When the lock rod 14 is moved forward, the handle post 4 and the fork stem 2 are locked, so that the angle operation of the handle 5 becomes impossible even when the tightening nut 6 is loosened, so that theft can be prevented when the bicycle is parked. ing.

The locking hole 1 provided on the side of the fork stem 2
5 is formed in a vertically long hole as shown in FIGS. 2 and 3 so that the locking position can be made to correspond even when the height of the handle 5 is changed as described above.

[0019]

According to the turning device of the present invention constructed as described above and used as described above, the structure is simplified as compared with the conventional device, and the steering operation of the steering wheel and the normal position can be performed. There is an excellent effect that the returning operation of the steering wheel can be easily performed and the operation of changing the height of the handle can be easily performed.

[Brief description of the drawings]

FIG. 1 is a partially cutaway perspective view showing a use state of an embodiment.

FIG. 2 is a partially cutaway elevation view of a main part.

FIG. 3 is a partially cutaway elevation view when locked at a turning position.

[Description of sign]

 DESCRIPTION OF SYMBOLS 1 Head pipe 2 Hawk stem 3 Bearing 4 Handle post 5 Handle 6 Tightening nut 7 Hole 8 Spring 9 Stop pin 9 'Head 10 Split groove 11 Screw part 12 Operating lever 13 Lock 14 Lock rod 15 Lock hole 16 Lock hole

Claims (3)

[Claims] 1. A pair of left and right holes penetrating in the diameter direction are provided on a side surface of a handle post, and a pair of left and right stop pins are provided in these holes to be elastically protruded and retracted outward by being urged by a spring from the inside. The upper end of the fork stem is cut in the length direction from the upper end of the fork stem at an interval corresponding to the angle difference between the normal position and the deflection position of the handle,
A split groove for fitting the head of the stop pin is provided, and a tightening nut having an operation lever is screwed from an upper end of the fork stem to an outer surface. Provided so that the system and the system rotate together. Also, when turning the handle, the tightening nut is loosened to allow the handle post to rotate, and at the turning position of the handle post, the head of the stop pin is hooked into the split groove at the deflection position of the fork stem, A turning device for a bicycle handlebar in which a handle post is fixed integrally with a fork stem at a deflection angle position by tightening a tightening nut. 2. The handle post and the fork stem,
2. The turning device for a bicycle handle according to claim 1, wherein a locking hole commonly locked by a lock provided on an upper portion of the head pipe is provided at the deflection angle position of the handle post. 3. The fork stem has a vertically long locking hole which is locked by a lock provided on an upper portion of the head pipe in common with a locking hole on the handle post side,
When the tightening nut is relaxed, the height of the handle can be adjusted by changing the fitting length of the fork stem and the handle post, and the lock is locked by the lock at the position where the fitting length of the handle post is changed. 3. The turning device for a bicycle handle according to claim 2, wherein