JP2585952Y2 - Bicycle handle post folding structure - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a handle post bending structure, and more particularly to a bicycle handle post bending structure for allowing a bicycle handle post to be bent.

[0002]

2. Description of the Related Art As a folding bicycle, for example, a handle post is slidably fixed to a head pipe (Japanese Patent Application Laid-Open No. 52-14500), or a handle is rotatably supported at the upper end of the handle post. (Japanese Utility Model Application Laid-Open No. 55-142386) is known. The former bicycle includes two guide pipes which are arranged parallel to the left and right sides of the head pipe with a space therebetween, and two handle posts which are slidably fixed to the guide pipes. In the latter bicycle, the handle is divided into two members, and the two members are provided so as to be rotatable around the handle axis. The handle is fixed so as to be rotatable around a horizontal axis with respect to the handle post.

In the former prior art, two handle posts need to be provided to avoid interference between the handle posts and the front wheels, so that the structure of the handle is complicated. Further, in the latter prior art, it is necessary to divide the handle into two, and since the handle is simply rotated between the handle and the handle post, the height of the handle does not become too low even when the handle is folded. Therefore, the folding size of the bicycle cannot be made compact.

In order to solve these problems, it is conceivable that the handle post has a bent structure. Generally, when a bicycle frame is formed into a bent structure, it is joined by a hinge and a lock member is put on the hinge (Japanese Patent Publication No. 58-39108). here,
The rear support stay of the bicycle has a bent structure, and the hinge of the bent portion is covered with a wrapper that engages with the outer shape of the bent portion. This locks the bend in the bend.

[0005] In the above-mentioned conventional configuration, since only the bend of the stay is locked by the wrapping tool, the frame rattles during extension due to the gap between the inner surface of the wrapping tool and the stay. Since the handle post is a steering component of the bicycle and is an important component, if such a conventional bent structure is adopted for the handle post, the handle post will rattle and cannot be driven safely.

[0006] An object of the present invention is to reduce backlash during extension in a bent structure.

[0007]

SUMMARY OF THE INVENTION A handle post bending structure according to the present invention is a structure for enabling a handle post of a bicycle to be bent, and includes an upper handle post, a lower handle post, a pin portion, and a sleeve portion. And The upper handle post has a tapered portion whose diameter gradually increases toward the bottom and an upper joint portion connected below the tapered portion at a lower portion. The lower handle post
An upper portion has a male screw portion and a lower joint portion connected above the male screw portion. The pin joints the two joints so as to be pivotable about a horizontal axis. The sleeve portion is disposed on the outer periphery of both joints, and has an enlarged diameter portion that engages with the tapered portion on the inner periphery at one end, and a female threaded portion that is screwed to the male thread portion is formed on the inner periphery at the other end.

[0008]

[Function] In the handle post bending structure according to the present invention,
When the female thread of the sleeve is screwed into the male thread of the lower handle post, the sleeve gradually moves downward. At this time, the enlarged diameter portion formed at one end of the sleeve portion engages with the tapered portion of the upper handle post. Then, as the screw is engaged, the tapered portion and the enlarged diameter portion are joined in a wedge-like manner without a gap, and the upper handle post is raised with no gap with respect to the lower handle post. Therefore, the upper handle post and the lower handle post can be firmly connected at the time of extension.

Conversely, when the male screw portion and the female screw portion are released from each other, the upper handle post and the lower handle post are joined at the joint portion, so that the upper handle post and the lower handle post can be freely turned. Therefore, it can be easily bent. Here, the handle can be bent with a simple structure, and the upper and lower handle posts can be firmly connected at the time of extension, so that there is little backlash at the time of extension.

[0010]

Referring to FIG. 1, a bicycle 1 according to an embodiment of the present invention includes a frame 2, a front wheel 3 supported at a front portion of the frame 2, and a rear wheel 4 supported at a rear portion of the frame 2. It is mainly composed of The frame 2 includes a head pipe 5, a front fork 6 rotatably supported by the head pipe 5 and supporting the front wheel 3, a handle portion 7 connected to the front fork 6 and rotatably supported by the head pipe 5. , An upper pipe 8 fixed in parallel with the head pipe 5
And lower pipe 9 and upright pipe 1 supporting saddle 10
1 and a main frame 12 for slidably fixing the upright pipe 11, the upper pipe 8 and the lower pipe 9.

The handle portion 7 includes a handle post 20,
It has a handle 21 fixed to the upper end of the handle post 20 so as to be rotatable around a horizontal axis, and a bent portion 22 arranged in the middle of the handle post 20. The handle post 20 is, as shown in FIG.
3 and lower handle post 2 supported by head pipe 5
And 4. A bent portion 22 is arranged between the upper handle post 23 and the lower handle post 24. The bent portion 22 includes an upper hinge 25 slidably and rotatably fixed to a lower portion of the upper handle post 23 and a lower hinge 2 screwed to an upper end of the lower handle post 24.
6, a support shaft 27 for pivotally supporting the hinges 25 and 26, a sleeve 28 for linearly connecting the hinges 25 and 26, and a spring 29 for urging the sleeve 28 downward. It is configured. Spring 29
It is disposed in a compressed state between the upper end of the lower handle post 2 4 of the lower end and the sleeve 28.

As shown in FIG. 4, a tapered portion 30 whose diameter gradually increases downward is formed on the lower peripheral surface of the upper hinge 25, and a double clevis 31 is provided below the tapered portion 30. Are connected. Also Niyama Clevis 31
The fixing bolt 32 is disposed between the upper hinge 25 and the center axis of the upper hinge 25. A taper nut 33 is fastened to the upper end of the fixing bolt 32 as shown in FIG.
The taper nut 33 enlarges the upper end of the upper hinge 25,
The upper hinge 25 is pressed against the inner surface of the upper handle post 23 to fix the upper hinge 25 to the upper handle post 23.

On the inner peripheral surface of the sleeve 28 facing the tapered portion 30, there is formed an enlarged diameter portion 34 whose inner diameter gradually increases downward. At the upper end of the lower hinge 26, a single clevis 35 connected to the double clevis 31 by the support shaft 27 is formed. A male screw 36 is formed on the outer peripheral surface of the upper end of the lower handle post 24, and a female screw 37 screwed to the male screw 36 is formed on the inner peripheral surface of the lower end of the sleeve 28.

The handle post 20 constructed as described above
Then, the sleeve 28 is turned to rotate the male screw 36 and the female screw 37.
When the sleeve 28 is lifted up against the urging force of the spring 29, the upper handle post 2
3 and the lower handle post 24 can be bent at the bent portion 22. When the sleeve 28 is rotated to fasten the male screw 36 and the female screw 37 in a state where the upper handle post 23 and the lower handle post 24 are linearly arranged, the tapered portion 30 and the enlarged diameter portion 34 are engaged as the fastening is performed. In this case, the upper handle post 23 is fixed to the lower handle post 24 without rattling.

The upper pipe 8 is composed of two pipes 40 and 41 which expand and contract in the axial direction. One end of the pipe 40 is fixed to the head pipe 5 by welding. Pipe 41
Is larger than the diameter of the pipe 40, and slidably fixes the other end of the pipe 40. The vertical pipe 11 is shown in FIG.
As shown in FIG. 5, a flat plate is bent in an inverted U shape, and a saddle 10 is fixed to a bent portion at the upper end thereof.

The main frame 12 has two flat plate members 12a,
12b are arranged in parallel. On both sides of the main frame 12, standing guide portions 42 for slidably supporting the standing pipe 11 are arranged. Standing guide section 42
Is provided with a lock portion 43 for fixing the standing pipe 11. Further, the flat plate members 12a of the main frame 12,
Between 12b, the pipe 41 of the upper pipe 8 and the lower pipe 9
The horizontal guide portions 44 and 45 for respectively supporting the slidably in the horizontal direction are arranged vertically. Lock portions 46, 46 are also arranged on these guide portions 44, 45. In addition, a hanger part 50 is arranged at a lower center portion of the main frame 12. In hanger part 50,
A gear crank 51 having a pedal 52 attached to the tip is rotatably supported. The pedal 52 can be folded inward by a folding mechanism (not shown). The rear wheel 4 is supported at the rear end of the main frame 12.

As shown in FIG. 5, the lock portion 43 includes a bracket 53 disposed so as to wind the two upright guide portions 42, an eccentric cam 54 supported on one end of the bracket 53, and an eccentric cam 54. And a lever 55 for rotating by 180 °. The eccentric cam 54 is a member for pressing the upright pipe 11 against the side surface of the upright guide section 42. The eccentric cam 54 enables the upright pipe 11 to slide up and down when the distance from the center of the eccentric shaft to the peripheral surface is the shortest, and when the eccentric cam 54 is located 3 to 6 degrees closer to the maximum displacement, The pipe 11 is pressed against the vertical guide portion 42 to lock the vertical pipe 11.

The lock portions 46 disposed on the horizontal guide portions 44 and 45 have the same configuration as shown in FIG. 6, and include a bracket 56 fixed around the horizontal guide portion 44 and a 180 ° rotation of the bracket 56. It has an eccentric cam 57 freely supported and a lever 58 for rotating the eccentric cam 57 by 180 °. Similarly, by rotating the lever 58 in the lock portion 46, the upper pipe 8 and the lower pipe 9 are pressed against the guide portions 44 and 45 to be locked.

In the bicycle 1 configured as described above, the lock portion 43 of the upright pipe 11 is temporarily released during riding,
The vertical pipe 11 is extended upward. Further, the handle 21 is fixed at a predetermined position. Further, the handle post 20 is fixed linearly by screwing the sleeve 28 into the lower handle post 24. Then, the upper pipe 8 and the lower pipe 9 are extended to a predetermined position and locked.

On the other hand, at the time of storage, the upper pipe 8 and the lower pipe 9 are unlocked, and the upper pipe 8 and the lower pipe 9 are contracted leftward in FIG. Then, the front wheel 3 and the rear wheel 4 move in the approaching direction. At this time, since the front wheel 3 and the rear wheel 4 are in contact with the ground, they can be expanded and contracted in a state of contact with the ground. For this reason, the frame 2 can be easily folded without lifting. And placing the saddle 10 on the top of the main frame 1 2 to move the pipe 11 vertically to unlock 43 downward. Further, the handle 21 is rotated downward. Finally, the handle post 20 is bent at the bent portion 22. At this time, the sleeve 28 is rotated to release the fastening of the sleeve 28, and the upper handle post 23 is bent with respect to the lower handle post 24. Then, it can be folded compactly as shown in FIG. Since the upper pipe 8 expands and contracts in two stages, the rear ends of the folded upper pipe 8 and lower pipe 9 do not protrude to the rear of the handle 21 in the stored state.

Here, since the upper pipe and the lower pipe are provided, the rigidity is high. Further, since the handle portion 7 has a bent structure instead of sliding, the handle structure is simplified and the handle portion 7 can be easily and compactly folded. In addition, since the stand pipe 11 is slidably fixed, the height of the stand pipe can be reduced, and the bicycle 1 can be made compact as a whole.

Since the upper handle post 23 and the lower handle post 24 are firmly fixed by the engagement of the tapered portion 30 and the enlarged diameter portion 34, the handle post 20 does not rattle when extended.

[0023]

In the bent structure of the bicycle handle post according to the present invention, the tapered portion and the enlarged diameter portion are joined in a wedge-like manner without any gap as the male screw portion and the female screw portion are screwed together. The upper handle post and the lower handle post can be firmly connected. For this reason, the backlash during extension is small.

[Brief description of the drawings]

FIG. 1 is a side view of a bicycle employing one embodiment of the present invention.

FIG. 2 is a front view taken along the line II-II.

FIG. 3 is an enlarged sectional partial view of a handle post.

FIG. 4 is an enlarged cross-sectional view of a bent portion.

FIG. 5 is an enlarged side view of a lock unit.

FIG. 6 is an enlarged cross-sectional view of a lock unit.

FIG. 7 is a side view showing a posture during storage.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Bicycle 7 Handle part 20 Handle post 22 Bent part 23 Upper handle post 24 Lower handle post 25 Upper hinge 26 Lower hinge 27 Support shaft 28 Sleeve 30 Taper part 31 Double clevis 34 Large diameter part 35 Single clevis 36 Male screw 37 Female screw

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. ⁶ , DB name) B62K 15/00 F16B 7/00

Claims (1)

(57) [Scope of request for utility model registration] 1. A bicycle handle post bending structure for bending a bicycle handle post, the tapered portion having a diameter gradually increasing downward.
An upper handle post having an upper joint portion extending below the tapered portion at a lower portion; a male screw portion; a lower handle post having an upper joint portion extending above the male thread portion at an upper portion; A pin portion rotatably joined about an axis; an enlarged diameter portion disposed on the outer periphery of the two joint portions and engaging with the tapered portion on one inner side; A bicycle handle post bending structure comprising: a sleeve portion formed with a female screw portion to be engaged;