JPH022718Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a bicycle handlebar support structure, in which the handlebar stem is tilted in one direction up and down from the mounting part to the handlebar fitting part, and can be mounted upside down and upside down on the head tube. The purpose of this is to make it possible to change the grip height of the handle.

As shown in FIG. 1, the conventional handle support structure has a handle stem 3 that extends through a head tube 2 rotatably and in a manner that prevents it from coming off, and extends from the upper end of the head tube 2 into a hollow shaft portion of the handle stem 3, which is shaped like an L-shape. 4, the lock bolt 5 is passed through the inserted hollow shaft portion 4, and by pulling up the wedge member 6 with the lock bolt 5, the lower end of the hollow shaft portion 4 is pushed out, and the handle stem 3 is moved against the head tube 2. Install and fix the head tube 2.
The handlebar 7 is fitted and fixed at the tip.

In such a conventional structure, the height of the handlebar stem 3 can be adjusted, but when it is raised, it protrudes greatly from the head tube 2, which reduces the support strength, and the posture of the handlebar remains unchanged.
Cannot be flipped upside down.

By the way, for example, a bicycle handlebar for overtaking has a U-shape when viewed from the side, and its grip is set at a very low position. This allows you to ride in a forward-leaning position so that you can reach high speeds during competitions, but it is extremely tiring during normal driving. Therefore, it is required to be able to change the grip to a higher position. Adjusting the height of the handle stem alone is not enough to change the height of the grip.
If you flip the handlebar upside down, the grip will move from the bottom to the top of the handlebar, making it higher up.

Furthermore, even in general bicycles, it is required that the handle stem can be set at various heights to match the height of the rider or the shape of the handlebar to which it is attached, without reducing its support strength.

The present invention solves the problems of the conventional structure and fully satisfies the above requirements.The main feature of this invention is that the head tube for the front fork can be attached to the head pipe at the front of the frame so that it can rotate freely and cannot be removed. In a bicycle handlebar support structure in which a handlebar stem for fixing the handlebar is attached to the head tube, the handlebar stem is inclined in one direction up and down from the attachment part to the handlebar fitting part, and the attachment part is The main feature is that it can be installed upside down on the head tube.

Hereinafter, embodiments of the present invention will be described based on the drawings.

In the first embodiment shown in FIGS. 2 and 3, a head tube 2 at the top of a front fork 11 is passed through a head pipe 1 at the front of a bicycle frame 10, and this head tube 2 includes a ball 12, a ball pusher 13, and a ball pusher 13. A pair of upper and lower bearings 1 consisting of receivers 14
5, and is prevented from coming off by a lock nut 17 screwed into an upper male threaded portion 16.

A mounting portion 20 of the handle stem 3 is fitted into the male threaded portion 16 of the head tube 2, and is prevented from coming off by a cap nut 21 screwed from the upper end.
A set bolt 22 is screwed into this mounting portion 20, and the set bolt 22 engages with an axial groove 24 for locking a stop washer 23 formed in the male threaded portion 16 to prevent the handle stem 3 from rotating.

The handle stem 3 has a handle fitting part 25 at the tip.
It fits into the center of the handlebar 7 and is relatively fixed via a crescent-shaped pressing body 26 and a screw 27.

The handle stem 3 is inclined in one direction up and down from the mounting part 20 to the handle fitting part 25.
By loosening the head tube 2, it can be attached to and removed from the head tube 2 and can be installed upside down. Therefore, the tip can be placed in the downward tilted position A shown by the solid line in Figures 2 and 3, and the tip shown by the imaginary line in Figure 3. The posture can be changed to an upwardly tilted posture B.

By attaching the handle stem 3 upside down, the height of the handle fitting part 25 is changed, and the grip 28 is also changed up and down with respect to the center of the handlebar 7, so that the grip 28 is vertically moved from the mounting part 20. You can adjust the position by twice the distance. Furthermore, by changing only the mounting direction of the handlebar stem 3 and keeping the attitude of the handlebar 7 unchanged during assembly, it is possible to construct a bicycle with a different grip height by the change in the height of the handlebar fitting part 25.

In the first embodiment, the handle stem 3 can be turned upside down by simply removing the cap nut 21 and loosening the set bolt 22, making it extremely easy to change the posture and adjust the height of the handle.

In the second embodiment shown in FIG. 4, the handle stem 3' has a mounting portion 20' fixed to a mounting member 30 which is U-shaped in side view via a bolt 31, and this mounting member 30 is attached to the head pipe 1 vertically. The lower mounting portion 30D has a shape that extends over the lower bearing 15.
The upper mounting portion 30U is located between the upper bearing 15U and the cap nut 21 between the large diameter portion 2a of the head tube 2, and is fitted with the head tube 2 and is connected to a set bolt provided on the upper mounting portion 30U. Rotation is stopped by 22.

The handle stem 3 has a hollow midway portion 32 extending from the vertical center of the mounting portion 20′ or from a position offset in the vertical direction from the center, and inclined in one direction vertically.
A handle fitting part 25 is formed at the tip thereof, and a screw 27 for pressing the pressing body 26 against the handlebar 7 is screwed into the middle part 32 from inside.

The handle stem 3' of the second embodiment is supported by the head tube 2 at two points, upper and lower, via the mounting member 30, and extends forward from the middle of the mounting member 30, so that the support strength is increased. Moreover, the handlebar 7 can be placed at a lower position.

If the handle stem 3' is turned upside down with respect to the mounting member 30, the handle fitting part 25 can be set either upward or downward, thereby making it possible to set two types of handle heights. 32 protrudes from a position vertically offset from the vertical center of the mounting portion 20',
It is possible to change the handle height by a distance twice as much as the amount of deviation.

Also, this handle stem 3' is attached to the cap nut 21.
In addition, reversal mounting is possible by simply loosening and loosening the bolt 31 without loosening the set bolt 22.

Furthermore, this handle stem 3' has a mounting member 30.
In that case, two types of handlebar heights can be selected only when assembling the bicycle.

According to the present invention described in detail above, the handle stem 3 is tilted in one direction up and down from its attachment portion 20 to the handle fitting portion 25, and the attachment portion 20 is freely attached upside down and upside down with respect to the head tube 2. By installing the handle bar 7 upside down, the handle fitting part 25 is changed to the upwardly inclined position A or the downwardly inclined position B, and its height changes, so that the height of the handlebar 7, that is, the height of the grip 28, can be changed. In addition, by inverting the handlebar 7 along with the handlebar stem 3, the grip height can be changed to a greater extent, making it possible to raise the grip and ride in a comfortable position when riding normally on an overtaking bicycle. It is possible to change the height of the grip of a general bicycle to a required height, and even if the position of the handle fitting part 25 is raised, sufficient support strength for the head tube 2 can be maintained. can.

[Brief explanation of drawings]

Fig. 1 is a longitudinal sectional view showing a conventional structure, Figs. 2 and 3 show a first embodiment of the present invention, Fig. 2 is an overall perspective view, Fig. 3 is a longitudinal sectional view, and Fig. 4 is a longitudinal sectional view. FIG. 7 is a partial cross-sectional view showing a second embodiment. 1...Head pipe, 2...Head tube,
3...Handle stem, 7...Handlebar, 2
0... Mounting part, 21... Cap nut, 25... Handle fitting part.

Claims (1)

[Scope of utility model registration request] A head tube 2 for the front fork is rotatably inserted through the head pipe 1 at the front of the frame in a manner that prevents it from coming off.
In a bicycle handlebar support structure with a fixed handlebar stem 3 attached, the handlebar stem 3
The bicycle handle support structure is characterized in that the mounting part 20 is inclined in one direction up and down from the handle fitting part 25, and the mounting part 20 can be attached to the head tube 2 upside down.