JP2006088744A - Overload avoiding head fixing lock for bicycle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an overload avoiding head fixing lock for a bicycle. <P>SOLUTION: In this fixing lock, a constant torque key to be destroyed by more than constant torque is fitted to a key groove provided on an inner diameter surface of a lock gear peripherally provided with a projecting teeth or a recess engaged to a lock pin of the fixing lock on an outer peripheral surface and a key groove of a front fork stem and is linked with the front stem, the constant torque key is destroyed in relation to overload more than required torque from a steering wheel, and overload applied to the head fixing lock such as the fork stem, the lock gear and the lock pin is avoided. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an overload avoidance head fixing lock for a bicycle that avoids an overload applied to the head fixing lock such as a front fork stem, a lock gear, and a lock pin.

Many proposals have been made on bicycle head locking tablets, for example, Japanese Utility Model Publication No. 54-23463. This patent applicant has also proposed Japanese Patent Application Laid-Open No. 11-5576.
The head fixing lock disclosed in Japanese Utility Model Laid-Open No. 54-23463 has a cylinder lock pin mounted on the side of the upper one provided with a large number of locking recesses on the periphery of the upper ball press. The front fork stem, which is fixed integrally with the upper ball press through the access hole, is locked. Next, in the bicycle head fixing lock disclosed in Japanese Patent Application Laid-Open No. 11-5576, a lock gear is provided on the front fork stem, with a longitudinal groove engaged with a key on the inner surface and convex teeth on the outer surface. The front fork stem is locked by engaging a stationary lock pin on the frame with the convex teeth. And these conventional head fixing locks cause the running trouble by fixing the front wheels at an oblique angle with respect to the frame, and exhibit theft prevention.
Japanese Utility Model Publication No. 54-23463 Japanese Patent Laid-Open No. 11-5576

However, there is a case where the head fixing lock is damaged due to an excessive load caused by a handle operation due to mischief due to an impact on the steering wheel due to a fall or trying to return straight for maintenance movement in a bicycle parking lot. The repair requires replacement of damaged parts at a bicycle store, which has the disadvantage of being troublesome and expensive.
The present invention has been made to solve the disadvantages of the conventional bicycle head fixing lock.

  A fixed torque key that breaks at a certain torque or higher is fitted in the key groove provided on the inner diameter surface of the lock gear and the key groove of the front fork stem that engages with the locking teeth of the lock pin on the outer peripheral surface. Overload avoidance head locking lock for bicycles linked to the hawk stem, destroying the constant torque key against excessive load exceeding the required torque from the handle and avoiding overload applied to the head locking lock such as the hawk stem, lock gear and lock pin It is in.

  The bicycle overload avoidance head fixing lock for a bicycle according to the present invention is as described above. Therefore, when an overload is applied from the handle, the constant torque key is destroyed to prevent the handle mechanism and the head fixing lock from being destroyed. .

  In addition, the configuration is simple because the constant torque key only fits into the keyway of the lock gear and the keyway of the handle stem, so the configuration is simple, easy to set and remove from the front fork stem, etc. It shortens and contributes to the reduction of manufacturing cost.

  The front fork stem is fitted with a key groove provided on the inner diameter surface of the lock gear and a key groove of the front fork stem that breaks at a certain torque or higher. An overload avoidance head fixing lock for bicycles that is connected to the bicycle.

  Hereinafter, the bicycle overload avoidance head fixing lock for bicycle according to the present invention will be described with reference to the bicycle overload avoidance head fixing lock 1 shown in FIG. 1 and FIG. 2 as an embodiment. The convex tooth 3 that engages with the lock pin 7 is provided around, the opposite inner diameter surface 2a has a key groove 4, and the key groove 5a of the front fork stem 5 is provided with a constant torque key 6 that is broken by a set torque. Fit and connect. Then, the lock gear 2 is set as required. In addition, although the said convex tooth 3 is not shown in figure, it is good also as a recess.

  The constant torque key 6 is made of a metal material or a synthetic resin material. The breaking load torque is, for example, 62 N · m or more.

  Next, an embodiment of the bicycle overload avoidance head fixing lock 1 according to the present invention and the assembly of the lock gear 2 and the front fork stem 5 will be described with reference to FIGS. 3 and 4. In the upper one 9, a pedestal portion 10 whose peripheral edge and a part of its outer edge are extended in a square shape is extended, and a screw insertion hole is provided in the vicinity of the outer edge of the pedestal portion 10, and this corresponds to the bottom surface. A head fixing lock body 11 provided with a screw receiving hole is attached to the upper surface of the cradle part 10 with a screw 12. After the ball press 13 is screwed into the front fork stem 5 and the bearing 14 is pressed to smoothly support the upper one 9, the key groove 4 provided on the inner diameter surface 2 a of the lock gear 2 and the key groove 5 a provided on the front fork stem 5 are provided. A constant torque key 6 is fitted to the front fork stem 5 and the lock gear 2 is fitted to the front fork stem 5, and a cover 15 is connected to the front fork stem 5 and is fitted to the front fork stem 5. After covering the outside of the upward flange 16 of the head-fixing lock body 11, the upper surface of the cover 15 is press-contacted with the intermediate nut 17 screwed into the front fork stem 5, and the car bracket 18 is fitted thereon, The presser nut 19 is screwed and further tightened with a cap nut 20.

  A cylinder lock receiving hole 21 is provided in the head lock main body 11 attached to the cradle unit 10 and a cylinder lock 22 as an example of a lock means is provided laterally and at a required angle to be freely rotatable. The front end of 22 is exposed on the outer surface of the head-fixing lock body 11, and the lock key 23 can be freely inserted from the outside, and an operation protrusion 24, which is an example of the operation means of the lock means, is integrally provided at the rear end. It can be turned freely.

  The lock pin 7 is reciprocated in the axial direction of the head pipe 8 by an operation projection 24 which is an example of an operation means of the lock means on the head fixed lock body 11, and the linkage provided on the lock pin 7 is provided. The portion 25 and the operation protrusion 24 of the cylinder lock 22 are linked.

  As a safety mechanism of the bicycle overload avoidance head fixing lock 1, a locking lock groove 26 and an unlocking lock groove 27 are provided on the outer periphery near the front end of the cylinder lock 22 at a required angle, in the embodiment, 90 degrees. A push button 29 is provided on the upper surface of the fixed lock body 11 and protrudes by being biased by the action of the safety lock spring 28 on the upper surface of the head fixed lock body 11. The bent portion 30a at one end is provided on the push button 29. The safety lock rod 30 is integrally connected with the operation direction in the transverse direction, and the insertion locking end 30b of the other end of the safety lock rod 30 is provided in the direction opposite to the operation direction, and each corresponds to The locking lock groove 26 and the unlocking locking groove 27 of the cylinder lock 23 are inserted and locked.

  Although the front fork stem 5 and the handle post 31 are not shown, they are integrally fixed by fixing means.

  Since the overload avoidance head fixing lock for bicycles of the present invention is as described above, the handle mechanism and the head fixing lock can be prevented from being broken even if an excessive load is applied to the handle when the handle lock is fixed. A great amount of labor, time and cost in the case of such destruction can be avoided by minimal reassembly.

It is a perspective view of the constant torque key connected with the lock gear used for the bicycle overload avoidance head fixed lock of this invention, and a front fork stem. Similarly, it is a longitudinal sectional view of a lock gear alone. It is a partially cutaway side view of the bicycle overload avoidance head fixing lock of the present invention. Similarly, it is a top view which shows the engagement state of a lock gear and a lock pin by removing an upper half cap nut, a presser screw, and an upper lid.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Bicycle overload avoidance head fixed lock 2 Lock gear 2a Inner diameter surface 2b Outer peripheral surface 3 Convex teeth 4 Key groove 5 Front fork stem 5a Key groove 6 Constant torque key 7 Lock pin 8 Head pipe 9 Upper one 10 Receiving part 11 Head fixed lock Main body 12 Screw 13 Cushion 14 Bearing 15 Cover 15a Outer edge 16 Upward flange 17 Middle nut 18 Car bracket 19 Presser nut 20 Cap nut 21 Cylinder lock receiving hole 22 Cylinder lock 23 Lock key 24 Operation protrusion 25 Linkage portion 26 Locking locking groove 27 Unlocking groove 28 Safety lock spring 29 Push button 30 Safety lock rod 30a One end bent portion 30b The other end insertion locking end 31 Handle post

Claims (1)

  A fixed torque key that breaks at a certain torque or higher is fitted in the key groove provided on the inner diameter surface of the lock gear and the key groove of the front fork stem that engages with the locking teeth of the lock pin on the outer peripheral surface. Overload avoidance head locking lock for bicycles that links with the hawk stem, destroys the constant torque key against excessive load exceeding the required torque from the handle, and avoids overload applied to the head locking lock such as the hawk stem, lock gear and lock pin .

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