JP3062630U - Fixing device of fork stem and lock gear in bicycle handle lock device - Google Patents

Abstract

(57) Abstract: The present invention provides a device for fixing a fork stem and a lock gear in a bicycle handle lock device with a simple, robust structure and low cost. SOLUTION: The outer peripheral surface of the fork stem is provided with at least two or more key grooves having a required width and depth in an outer peripheral surface of a fork stem at a predetermined angle and in a fitting hole of a lock gear. And a protruding portion key that fits and engages with the key groove configured as described above.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a device for fixing a fork stem and a lock gear in a bicycle handle lock device.

[0002]

[Prior art]

 Conventionally, a device for fixing a fork stem and a lock gear in a bicycle handle lock device is disclosed in Japanese Patent Application Laid-Open No. 10-181647. Each of the lock holes 19 penetrates, a convex key 15a projecting from the inside of the lock gear 15 is fitted into the key groove 12a, and the concave cavity 1 opening into the inside of the lock gear 15 is fitted into the lock hole 19. 6 is fitted with a detent key 18 projecting from the inner diameter by an expanding spring 17 to fix the fork stem 12 and the lock gear 15 doubly.

[0003]

[Problems to be solved by the invention]

 Since the conventional fixing device is configured as described above, the fork stem has two processing operations of providing a key groove and a lock hole. A locking key with a complicated structure protruding by spring pressure must be provided in the recessed cavity, which requires a large number of parts as a fixing device, and requires a certain procedure for the assembly process, which increases the manufacturing cost. It was an invitation.

[0004] In view of the above, the present invention has been made with the object of using only the fork stem and the lock gear as components, making the fixing structure simple and robust, and eliminating the drawbacks that increase the conventional manufacturing cost. is there.

[0005]

[Means for Solving the Problems]

 A key groove having a required width and depth is provided at least at two or more places on the outer peripheral surface of the fork stem in the axial direction. The key groove is formed on the outer peripheral surface of the fork stem in the fitting hole of the lock gear. And a fixing device for fixing a fork stem and a lock gear in a handlebar locking device for a bicycle, wherein a convex key which is fitted and engaged with a key groove is formed so as to protrude.

The key groove of the haw stem and the convex key of the lock gear may be press-fitted.

[0007] The lock gear may be provided at a fixed position while being sandwiched between an upper one-ball presser nut and a lock nut screwed into the outer peripheral surface of the fork stem.

[0008]

[Embodiment of the invention]

 A key groove having a required width and depth is provided at least at two or more places on the outer peripheral surface of the fork stem in the axial direction. The key groove is formed on the outer peripheral surface of the fork stem in the fitting hole of the lock gear. The fixing device of the present invention is a device for fixing a fork stem and a lock gear in a handlebar locking device for a bicycle, wherein a protruding portion key which fits and engages with a key groove is formed so as to protrude.

[0009]

【Example】

 Hereinafter, the fixing device for the fork stem and the lock gear in the bicycle handle lock device of the present invention will be described with reference to the drawings as an example of the embodiment. Reference numeral 1 denotes a fork stem and 2 denotes a lock gear. The fork stem 1 is provided with a second key groove 4 which is inconsistent with the key groove 3 originally provided in the axial direction of the outer peripheral surface by 90 degrees, and is fitted into the key groove 3 and the second key groove 4, respectively. A projecting key 6 to be engaged and a second projecting key 7 which is inconsistent with the projecting key 6 by 90 degrees are formed to protrude into the fitting hole 5 of the lock gear 2, and the keyway 3 and the second key of the fork stem 1 are formed. The convex key 6 and the second convex key 7 of the lock gear 2 are fitted and engaged with the groove 4, respectively.

A lock rod 9 is provided at a fixed position with respect to a lock groove 8 formed at a required width and depth on the outer peripheral surface of the lock gear 2, and the lock rod 9 is moved by operation to lock the lock rod 9. The tip of the rod 9 is fitted into one of the lock grooves 8 of the corresponding lock gear 2, restrains the fork stem 1 in a fixed position with respect to the vehicle body 10 equipped with the lock rod 9, and connects the fork stem 1 and the connection thereto. The rotation of the handle post 11 is locked.

The lock gear 2 is fitted and engaged with the fork stem 1 as described above, and is interposed between the upper one-ball presser nut 12 and the lock nut 13 screwed to the outer periphery of the fork stem 1 and arranged at a fixed position. .

The key groove 3 and the second key groove 4 of the fork stem 1 and the convex key 6 and the second convex key 7 of the lock gear 2 can be loosely fitted to each other. In order to eliminate them, the fitting surfaces of the mutual members may be configured as precisely as possible, or they may be press-fitted.

In the illustrated embodiment, the widths of the key groove 3 and the second key groove 4 of the fork stem 1 and the convex key 6 and the second convex key 7 of the lock gear 2 are the same, respectively. For example, the width of the key groove 3 of the main fork stem 1 and the convex key 6 of the lock gear 2 is widened, and the second key groove 4 of the sub fork stem 1 and the second convex key 7 of the lock gear 2 are narrow. It may be configured.

In the illustrated embodiment, the keyway 3 and the second keyway 4 of the fork stem 1 and the protruding key 6 and the second protruding key 7 of the lock gear 2 have a misalignment angle of 90 degrees. However, it is not limited to this.

In the illustrated embodiment, the key groove 3 and the second key groove 4 of the fork stem 1 and the convex key 6 and the second convex key 7 of the lock gear 2 are respectively formed at two locations. However, the present invention is not limited to these two locations, but may be increased to third and fourth, and a required number of key grooves and convex keys may be configured for each required angle.

[0016]

[Effect of the invention]

 The fixing device for the fork stem and the lock gear in the bicycle handlebar lock device of the present invention is as described above. In terms of function, the keyway of the fork stem is provided at two locations, so the engagement bearing surface is more than twice. The impact of the rotation of the steering wheel is twice as strong, so it can withstand enough. In addition, the lowering of the strength due to the second key groove can maintain sufficient strength because the outer peripheral surface is reinforced by the upper ball holding nut and the lock nut.

Since the configuration of the fixing device for the fork stem and the lock gear in the bicycle handle lock device of the present invention is as described above, the lock hole penetrating into and out of the fork stem and the concave cavity of the lock gear are provided. The rotation stop key which is housed and protrudes from the inner diameter by the expanding spring is unnecessary, and the configuration of the fixing device of the fork stem and the lock gear requires the minimum number of parts of only the fork stem and the lock gear, and the key groove in the fork stem is reduced. It is only necessary to increase the number of lock gears by one or more as compared with the conventional ones, and it is sufficient to machine the key groove portion in the production mold and place the lock gear, and in the assembly process, simply fit the lock gear to the fork stem. The cost of production can be minimized.

Therefore, the fixing device for the fork stem and the lock gear in the bicycle handlebar lock device of the present invention greatly contributes to reduction of manufacturing cost.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an engagement state between a fork stem and a lock gear of an embodiment of a fixing device for a fork stem and a lock gear in a bicycle handle lock device of the present invention.

FIG. 2 is a cross-sectional view of the same fork stem of the embodiment.

FIG. 3 is a plan view of the lock gear alone of the embodiment.

FIG. 4 is a partially cutaway side view showing the entirety of the bicycle handle lock device equipped with the embodiment of the device for fixing the fork stem and the lock gear of the present invention.

FIG. 5 is also a plan view.

FIG. 6 is a partially cutaway sectional side view showing a fixing device of a fork stem and a lock gear in a conventional bicycle handlebar lock device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hawk stem 2 Lock gear 3 Keyway 4 Second keyway 5 Fitting hole 6 Convex key 7 Second convex key 8 Lock groove 9 Locking rod 10 Body 11 Handle post 12 Upper one ball holding nut 13 Lock nut

Claims (3)

[Utility model registration claims] At least two key grooves having a required width and depth are provided at at least two places on an outer peripheral surface of a fork stem in an axial direction, and an outer peripheral surface of the fork stem is provided in a fitting hole of a lock gear. A fixing device for a fork stem and a lock gear in a bicycle handle lock device, wherein a convex key that fits and engages with a key groove formed on a surface is formed so as to protrude. 2. The device according to claim 1, wherein the key groove of the fork stem and the convex key of the lock gear are press-fitted. 3. The lock gear according to claim 1, wherein the lock gear is sandwiched between a lock nut and an upper one-ball presser nut screwed onto an outer peripheral surface of the fork stem, and is disposed at a fixed position.
Or a fixing device for fixing the fork stem and the lock gear in the bicycle handle lock device according to claim 2.