JPH0225753Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a bicycle handlebar mounting structure.

In general, in competition bicycles and sports-type bicycles, the grip of the handlebar is positioned in front of the outer periphery of the head pipe so that the body leans forward during high-speed riding.

However, in the conventional handle mounting structure, as shown in FIG. 1, the hawk tube 4 of the front fork 3 is rotatably inserted into the head pipe 2 of the frame 1, and a stopper 5 is attached to the upper end of the hawk tube 4.
is screwed on. Then, the lower cylindrical portion 8 of the handle stem 7 to which the drop handle 6 is attached is inserted from the upper end of the hawk tube 4, and the wedge member 10 is screwed onto the lower end of the bolt 9 passed through the lower cylindrical portion 8. by rotating the wedge member 10
By pulling up the lower cylindrical portion 8, the lower cylindrical portion 8 is expanded and fixed to the hawk tube 4 under pressure. In such a conventional handle mounting structure, the handle stem 7 is located above the head pipe 2, so in order for the driver to grasp the handle in front of the outer periphery of the head pipe 2, the drop handle 6 as described above is required. It becomes necessary. That is, by forming a straight part 12 that passes through the clip part 11 of the handle stem 7 and extends in the left-right direction, and U-shaped parts 13, 13, which bend both ends of the straight part 12 in the forward direction and then fold back toward the lower side, the lower part of the straight part 12 is formed. The portion folded back toward the front is located in front of the outer periphery of the head pipe 2 and serves as a grip portion 13a. However, such a drop handle 6 has a complicated shape and is not easily modified.

In view of the above, the present invention provides a handle mounting structure that does not require deforming the handle into a complicated shape when gripping the handle in front of the outer periphery of the head pipe. In a bicycle handlebar mounting structure in which a hawk tube is rotatably inserted into the head pipe in a manner that prevents it from coming off, and a handlebar stem is fixed to the hawk tube, a fixing device provided on the handle stem straddles the head pipe in the vertical direction, Its ends are at points fixed to the hawk tube.

Embodiments of the present invention will be described below with reference to the drawings.

In FIGS. 2 to 4, reference numeral 14 denotes a bicycle frame having a head pipe 15 at its front end. 16 is a tire rotatably supported by the front fork 17. 18 is a handle stem to which a handle 19 is attached. A hawk tube 20 protruding from the upper end of the front fork 17 is inserted into the head pipe 15 so as to be rotatable and not come off, and the handle stem 18 extends through the hawk tube 20 in the vertical direction of the head pipe 15. It is fixed via a fixture 21 and located in front of the outer periphery of the head pipe 15.

Bearings 22, 22 are attached to the upper and lower ends of the head pipe 15, and the hawk tube 20 is rotatably supported on these bearings. A lock nut 24 is screwed onto the upper end of the hawk tube 20, thereby preventing the hawk tube 20 from coming off.

The handle 19 consists of a straight part 25 extending straight in the left-right direction, and grip parts 26, 26 bent forward from both ends of the straight part 25. The front ends of the gripping parts 26, 26 are slightly curved upward.

The handle stem 18 is the straight part 2 of the handle 19
5 is passed through the clip portion 27 and the clip portion 2
It has an arm part 28 which is continuous from 7 in the direction of the head pipe 15, and a flange part 29 provided at the base end of the arm part 28. Further, the arm portion 28 is provided with a hollow portion 30 that opens at the bottom surface of the flange portion 29. The straight portion 25 of the handle 19 that is penetrated by the clip portion 27 is also connected to the clip portion 27.
It is fixed with a bolt 32 via a crescent-shaped pressing piece 31 inserted into the holder. This bolt 32
Since it is inserted through the cavity 30, it is not visible from the outside, making it desirable in terms of appearance.
Further, the joint surface between the pressing piece 31 and the straight portion 25 is a non-slip surface.

As shown in FIG. 5, the fixture 21 includes an upper fixture 21a shaped like an inverted L and a lower fixture 2 shaped like an L.
1b. A mounting hole 34 is provided in the upper end 33 of the upper fixture 21a, and a protrusion 35 is formed on the inner peripheral surface of the mounting hole 34. In addition, a long hole 36 with a long diameter extends in the vertical direction at the bottom of the front surface of the upper fitting 21a.
is provided, and a large number of through holes 37 are provided above it in parallel in the vertical direction. Lower fixture 21
A mounting hole 39 is provided in the lower end portion 38 of b. Both fixtures 21a and 21b are connected by a screw 41 inserted into the elongated hole 36 of the upper fixture 21a. Also, a pair of bolts 4 are inserted into a pair of through holes 37, 37 on the front surface of the upper fixture 21a.
3 and 43, the flange portion 29 of the handle stem 18 is fixed to the fixture 21. Also, before inserting the hawk tube 20 into the head pipe 15, the fixture 21 is placed across the head pipe 15 and the bearings 22, 22 at both ends thereof, and then the hawk tube 20 is inserted into the mounting holes 34, 39 at both ends 38, 38 and into the head pipe. 15 and the bearings 22, 22. At this time, there is a notch 4 on the upper circumferential surface of the hawk tube 20.
4, and the protrusion 3 of the upper end 33 mounting hole 34 is provided here.
By engaging and fitting 5, the fixture 21 and the hawk tube 20 are rendered immovable relative to each other. By screwing the lock nut 24 onto the hawk tube 20, the fixture 21 is attached to the lock nut 24.
and the upper bearing 22, thereby fixing the fixture 21 to the hawk tube 20.

In the handle mounting structure shown in the above embodiment,
Although it is conceivable to form the fixture 21 integrally, the reason why the upper fixture 21a and the lower fixture 21b are formed by connecting them is to accommodate the fact that the length of the head pipe 15 differs depending on the type of bicycle. This is to enable the length of the fixture 21 to be adjusted in the vertical direction, and for this reason both fixtures 21a and 21b are connected to the elongated hole 3.
6 through screws 41.

Further, in the above embodiment, since the handle stem 18 is provided with respect to the fixture 21 so that the vertical position can be freely adjusted, the handle stem 18 can be adjusted according to the physique of the driver.
The vertical position can be adjusted. For this purpose, a large number of through holes 37 for the bolts 43 for fixing the handle stem 18 are provided in the vertical direction on the front surface of the upper fixture 21a. By forming the through hole 37 into an elongated hole 45 as shown in FIG. 6, fine adjustment of its vertical position can be made.

According to the present invention, the fixture 21 provided on the handle stem 18 straddles the head pipe 15 from above and below, and its both ends 38, 38 are fixed to the hawk tube 20, so that the handle stem 18 is attached to the head pipe 15. It is located at the front of the outer periphery, and the handle 19 grip part 26 is connected to the head pipe 15.
Since there is no need to bend the head pipe 2 downward from the top like the conventional drop handle 6 to position it at the front of the outer periphery, the handle 19 can be easily modified because it has a simpler shape than the drop handle 6. . Further, unlike the conventional handle stem 7, the handle stem 19 does not require the lower cylindrical portion 8, so it has a short size, making it less likely to bend, increasing rigidity, and reducing the amount of material required to reduce manufacturing costs. Furthermore, in the conventional handle mounting structure, the handle stem was supported only at the upper end of the head pipe, but according to the present invention, it is supported at two positions above and below the head pipe, which is preferable in terms of strength.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing the mounting state of a conventional drop handle, Fig. 1 and 2 are enlarged cross-sectional views of essential parts showing the same mounting structure, and Fig. 2 shows the mounting state of the handle according to the handle mounting structure of the present invention. Perspective view shown, 3rd
The figure is an enlarged sectional view of the main parts showing the mounting structure, Figure 4 is a front view showing the mounting state, Figure 5 is a perspective view of the fixture according to the present invention, and Figure 6 is a different implementation of the fixture. It is a perspective view showing an example. 14...Frame, 15...Head pipe, 1
7...Front fork, 18...Handle stem, 20...Hawk tube, 21...Fixing tool,
33... Upper end portion, 38... Lower end portion.

Claims (1)

[Scope of utility model registration request] In a bicycle handlebar mounting structure in which a fork tube 20 of a front fork 17 is inserted into a head pipe 15 of a frame 14 so as to be rotatable and not come off, and a handlebar stem 18 is fixed to the fork tube 20, a handlebar stem 18 is provided on the handlebar stem 18. A bicycle handlebar mounting structure characterized in that a fixing member 21 vertically extends over a head pipe 15, and both ends 33, 38 of the fixing member 21 are fixed to a hawk tube 20.