JPS6329675Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a bicycle handle stem, and aims to facilitate the disassembly and assembly of the bicycle when storing it in a bicycle bag, as well as to facilitate the manufacture of the handle stem. purpose.

As shown in FIG. 1, a conventional bicycle handlebar stem 1 includes a stem portion 3 fixed to the stem portion of the upper part of the front fork by a pull-up bolt 2, and a grip integrally protruding from the upper end of the stem portion 3. The grip part 4 has a fork-shaped tip end side, and the base side of the fork part 5 is a holding part 7 which is approximately C-shaped in side view and holds the handlebar 6. Tighten the tip side of the forked part 5 with a bolt 8 and a nut 9
By fastening with the handlebar 6, the handlebar 6 can be tightened and fixed by the holding part 7.
By the way, in the conventional handle stem 1 described above, since the holding part 7 does not open wide, there is an inconvenience that the handle bar 6 cannot be attached to or detached from the handle stem 1 while it is wrapped with handle tape.
Therefore, there is a drawback that disassembling and assembling the bicycle when carrying it in a bicycle carrying bag is time consuming.
Furthermore, although the handle stem 1 is recently manufactured by forging light alloy, the conventional handle stem 1 has a cylindrical stem portion 3 and a forked grip portion 4 as described above. Since the handle stem 1 has a complicated structure in which the handle stem 1 is integrated, it takes a lot of time and effort to forge the handle stem 1, and there is a problem that the handle stem 1 cannot be manufactured easily.

Therefore, the present invention has solved the above problems, and its features include a grip part 17 that holds the handlebar 22 and fastens and fixes it with a fastening bolt 29, and a front fork 1.
In the bicycle handlebar stem 15 which is fixed to the handlebar stem 15 by a pull-up bolt 20 to the grip portion 1
Reference numeral 7 denotes a holding portion 23 having a substantially circular shape in side view and the holding portion 23
The press fitting portions 24 and 25 are provided opposite to each other and protrude rearward from both ends of the rear divided portion, and a circular recess 26 is formed in the lateral center of the upper surface of the upper press fitting portion 24. A protrusion 27 for preventing forward slippage is provided on the lower surface of the lower pressing fitting part 25 and protrudes laterally, and both pressing fitting parts 24 and 25 of the grip part 17 are provided on the front surface of the front end of the stem body 16 of the handle stem 15. A fitting recess 28 is provided with a fitting groove 30 in the lateral direction into which the protrusion 27 is fitted when the slide fitting is slidably fitted and detached from the side. In order to freely press and release the parts 24 and 25 in the direction of approaching each other, a fastening bolt 29 that protrudes freely into and out of the fitting groove 28 and is fitted into the circular recess 26 is attached to the upper surface side of the front end of the stem body 16. The point is that they are screwed together.

Hereinafter, a first embodiment of the present invention will be described based on the drawings. In FIGS. 2 to 4, 11 is a bicycle frame, and a head tube 12 of the frame 11 has a cylindrical stem on the upper part of a front fork 13. A portion 14 is rotatably provided. 15
1 is a handle stem, which is manufactured by forging a light alloy, and consists of a stem body 16 and a grip portion 17 that is detachably attached to the stem body 16. The stem body 16 is the front fork 13
a cylindrical stem portion 18 which is inserted into and removably into the stem portion 14 as an upwardly protruding shape;
It consists of a mounting part 19 projecting forward from the upper end, and a pulling bolt 20 is inserted into the stem part 18 and is removably screwed to a nut 21.
A stem portion 18 is detachably fixed to the stem portion 14. The grip portion 17 is shown in FIGS. 2 and 3.
As shown in the figure, there is a cylindrical holding part 23 that holds the handlebar 22 and is approximately circular in side view, and a holding part 23 which faces each other and protrudes rearward from both ends of the divided part on the rear side of the holding part 23. and press fitting portions 24 and 25 provided,
The press-fitting parts 24 and 25 are spaced apart from each other appropriately, and the handlebar 22 can be tightened and fixed by the holding part 23 and released by expanding and contracting the space. Further, a circular recess 26 is formed in the center in the upper surface direction of the upper press fitting part 24, and a lateral protrusion 27 is provided on the lower surface of the lower press fitting part 25. On the front surface of the mounting portion 19 of the stem body 16, both pressing fitting portions 2 of the grip portion 17 are provided.
A fitting groove 28 is formed in which the fittings 4 and 25 are slidably fitted in and out from the side.
A fastening bolt 29 is screwed into the upper side of the front end of the bolt 9 so that it can move forward and backward, and as the fastening bolt 29 moves forward and backward, the lower end of the fastening bolt 29 can move in and out of the fitting groove 28, and is fastened through the protrusion. The lower end of the bolt 29 is slidably fitted into the circular recess 2 of the grip portion 17.
At the same time, the handlebar 22 is inserted into the grip part 1 and pressed downward to narrow the distance between the two press fitting parts 24 and 25.
It is fastened and fixed to the holding part 23 of No.7. Further, relative movement in the lateral direction between the grip portion 17 and the attachment portion 19 of the stem body 16 is prevented by the engagement between the fastening bolt 29 and the recess 26, and relative movement in the front and rear direction is prevented by the projection 27 and the fitting groove. 28 and the protrusion 27
The grip portion 17 is secured to the stem body 16 by fitting into a lateral fitting groove 30 which is slidably fitted from the side.

The first embodiment of the present invention is constructed as described above. For example, when disassembling a bicycle to store it in a bicycle bag, the fastening bolt 29 is screwed back to prevent it from protruding into the fitting groove 28. After removing the grip, slide the grip part 17 laterally and attach the mounting part 19.
It is only necessary to remove the grip portion 17 more easily. With the grip part 17 attached to the handlebar 22 and the stem body 16 attached to the frame 11, they can be stored in a bicycle bag without any problems, and the disassembly work when storing them in the bicycle bag is easy. It's easy. In addition, when assembling at the destination, the grip part 1 can be left attached to the handlebar 22.
7 into the fitting groove 28, and tighten the fastening bolt 29.
By screwing it forward, the original assembled state can be obtained and the assembly work is easy. Note that handlebar tape, grips, etc. are normally attached to the handlebar 22 for the purpose of improving grip, and the handlebar 22 is stored in a bicycle bag with the grip portion 17 attached. Also, the handle tape, grip, etc. will prevent it from coming off, and there is no risk of the grip part 17 getting lost. As described above, there is no need to rewind the handle tape or attach or detach the grip during disassembly/assembly work, and the speed of work and work efficiency can be improved. Also handle stem 15
The structure is divided into the stem body 16 and the grip part 17, which simplifies the structure of each.
Therefore, it does not take much time or effort to manufacture them, and they can be manufactured simply and easily, and production efficiency can be improved. Furthermore, the fastening bolt 29 is configured to be used both for fixing the grip portion 17 to the stem body 16 and for fixing the handlebar 22 to the holding portion 23 of the grip portion 17, which simplifies the configuration. In addition, by tightening and loosening the fastening bolts 29, the grip part 17 can be fixed and released from the stem body 26, and the holding part 23 can be fixed and released from the handlebar 22 at the same time, which speeds up the disassembly and assembly work. This contributes to improved performance and efficiency. Furthermore, even if the fastening bolt 19 is slightly loosened, the lower end of the fastening bolt 19 may
6, which prevents it from coming off to the side or the front, and also prevents the handlebar 2 from slipping off when driving.
Although a large forward force acts on the grip part 2, the forward slippage is effectively prevented by the engagement between the protrusion 27 and the fitting groove 30, and the posture of the grip part 17 is well maintained. , safety during operation is great. In addition, since the fastening bolt 29 is screwed onto the top side, the fastened state and disengaged state can be easily checked visually.
Safety can also be improved from this point of view. Furthermore, if handlebar stems 15 with stem portions 18 of different lengths are required depending on the bicycle model, only the stem body 16 needs to be manufactured in various ways, and the grip portion 17 can also be used for each bicycle model. It can be easily and inexpensively modified to the optimum position. In addition, compared to the conventional structure in which the front end is provided with a divided portion that is tightened with the fastening bolt 8 and nut 9, the front end of the grip portion 17 is approximately circular in side view, reducing air resistance during running. There are advantages to doing so.

FIG. 5 shows a grip portion 17 as a second embodiment, in which pressing fitting portions 24 and 25 are protruded to face each other in a substantially semicircular shape when viewed from the side.

In the second embodiment, the entire press fitting portion 25 is configured as a protrusion 27.

As described above, in the present invention, the handle stem is divided into a grip part that tightens and fixes the handlebar, and a stem body that is fixed to the front fork, so the manufacture of each part is simple and easy. This can improve production efficiency, and if handlebar stems with different stem lengths are required depending on the bicycle model, it is sufficient to manufacture only the stem body of various types, which can be easily and inexpensively done. Further, when disassembling the bicycle, there is no need to remove the handlebar from the grip, and it is only necessary to remove the grip from the stem body, making the disassembly and assembly easy. Furthermore, even if the fastening bolt becomes slightly loose, the lower end of the fastening bolt is fitted into the recess, which prevents the grip from coming off to the side or the front. Although a large forward force is applied, the engagement between the protrusion and the fitting groove effectively prevents the grip from coming off, and the posture of the grip is maintained well, improving safety. can be achieved. Furthermore, the rear part of the grip section, which is generally circular in side view, is attached to the front side of the stem body, which has the advantage of reducing air resistance during running. Further, since the fastening bolt is screwed onto the upper surface of the stem body, the fastening state and detached state of the fastening bolt can be easily visually confirmed, and from this point of view as well, safety can be improved.

[Brief explanation of drawings]

Fig. 1 is a side sectional view of the main part showing the conventional example, Fig. 2 is a partially sectional side view showing the first embodiment of the present invention, Fig. 3 is an exploded perspective view of the main part, and Fig. 4 is the same as the second embodiment. 5 is a side view of the grip portion in the second embodiment. 13... Front fork, 15... Handle stem, 16... Stem body, 17... Grip section, 20... Pulling bolt, 22... Handlebar, 23... Holding section, 24, 25... Press fit Joint part, 28... Fitting groove, 29... Fastening bolt.

Claims (1)

[Scope of utility model registration request] Tighten the bolt 2 by holding the handlebar 22 in place.
In the bicycle handle stem 15, which is fixed to the front fork 13 by a pull-up bolt 20, the grip part 17 is provided with a grip part 17 which is fastened and fixed by a grip part 9, and which is fixed to the front fork 13 by a pull-up bolt 20.
and press fitting parts 24 and 25 that are opposed to each other and protrude rearward from both ends of the divided part on the rear side of the holding part 23, and a circular recess in the lateral center of the upper surface of the upper press fitting part 24. 26 is formed, and a protrusion 27 for preventing the handle stem 15 from coming off in the lateral direction is provided on the lower surface of the lower pressing fitting part 25, and the stem body 1 of the handle stem 15 is
6 Both pressing fitting parts 2 of the grip part 17 are attached to the front of the front end.
4 and 25 are slidably fitted in and out from the sides, and a fitting groove 28 is provided with a lateral fitting groove 30 into which the protrusion 27 is fitted during the sliding fitting. In order to freely release the pressure in the direction of bringing the pressure fitting parts 24 and 25 closer to each other, a fitting groove 28 is formed.
A bicycle handle stem characterized in that a fastening bolt 29 that protrudes inwardly and retractably and is fitted into the circular recess 26 is screwed onto the upper surface side of the front end portion of the stem body 16.