JPH021193Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a folding device for a bicycle handlebar post, and is particularly suitable for a folding bicycle handlebar post.

Conventionally, when folding or disassembling this type of bicycle to carry or store it, if the handlebars are still attached, the width is too large and gets in the way. This required the troublesome work of tying it down together with the wheels.

Furthermore, the above-mentioned conventional folding bicycle has the disadvantage that it is time-consuming because the handlebar must be carefully adjusted so that it faces straight ahead when assembled.

The present invention was devised from the above-mentioned viewpoints, and it not only makes it easy to fold the handlebar, but also allows the handlebar to be connected to the bicycle frame even after folding, making it easy and accurate to position the handlebar during assembly. In addition, it is an object of the present invention to provide a folding handlebar post for a bicycle, which allows easy adjustment of a nut of a lifting mechanism for a lifting chair and securely fixes a handlebar.

Embodiments of the present invention will be described below with reference to the drawings.
In the figure, 1 is the head pipe of the bicycle frame, 1a,
1b is a head drag, 2 is an upper pipe, 3 is a lower pipe, 4 is a front hawk, 5 is a front hawk stem that is integrally connected to the front hawk 4, 6 (see Figure 7) is a lower cone, 7 is a steel ball, 8 is a lower one, 9 is an upper one, 10 is a steel ball, 11 is an upper cone, 12 is a washer, 13 is a middle nut, and 14 is a cap nut.

Further, 15 is a handlebar, and 16 is a handle post. This handle post 16 has an inclined surface 1
It is divided into upper and lower parts by 7, and the lower part will be referred to as the lifting head 18 hereinafter. Note that 19 in FIG. 2 is a clamp bolt for fixing the handlebar 15, and 20 is a clamp nut thereof.

The handle post 16 is shown in FIGS. 4 and 5.
As shown in the figure, it is formed in a hollow shape, and an eccentric cam hole 16a is provided horizontally at the upper end thereof. 21 is a lever with an eccentric cam, and this lever 2
1 and the eccentric camshaft 22 are integrally formed,
An eccentric cam 23 is integrally formed on the lever 21 side of the eccentric cam shaft 22 to fit into the one eccentric cam hole 16a. The other side of the eccentric cam shaft 22 is formed into a square tube shape, and a bush-shaped eccentric cam 23' that fits into the other eccentric cam hole 16a is fitted into the square tube portion 22a, and a washer 24, It is prevented from coming off by a cap nut 25.

Further, as shown in FIG. 6, a cable end connecting fitting 27 having a hole 27a that fits with the eccentric camshaft 22 is fitted and fixed to one end of the wire 26, and a screw end is screwed to the other end of the wire 26. A cable end screw fitting 28 having a portion 28a is fitted and fixed thereto, and the pulling forceps 18 are formed into a hollow cylindrical shape with a bottom, and a screw insertion hole 18a is formed at the bottom thereof.

Then, as shown in FIG.
At the same time, the threaded part 28a of the cable end threaded fitting 28 of the wire 26 is made to protrude outside from the hole 18a, and the lock nut 30 and adjustment nut 31 are inserted into the protruding threaded part 28a via a plurality of disc spring washers 29.
Screw together. Note that 32 is a cap fitted into the upper end of the hollow hole of the handle post 16.

In addition, as shown in FIG. 3, the handle post 16
and a guide groove 33 on one side of the lifting mouse 18.
is provided parallel to the axis. Note that this guide groove 33
In order to prevent the handle post 16 from coming off when the handle post 16 is pulled up, the handle post 16 is stopped midway so that it does not reach the lower end of the lifting scoop 18.

Further, as shown in FIG. 1, a guide washer 35 is formed which fits into the front Hawk stem 5 projecting upward from the center nut 13 and has a projection 34 that engages with the guide groove 33. A split groove 36 into which the protrusion 34 fits is provided in the upper part of the lever 5, and when assembled as shown in FIGS. 2 to 4, the lever 21 is pulled up as shown in FIG. The post 16 is inserted into the front Hawk stem 5 via the guide washer 35 and the cap nut 14 as shown in FIG. That is, the guide washer 35 is inserted between the middle nut 13 and the cap nut 14, and the protrusion 34 of the guide washer 35 is connected to the front hawk stem 5.
It engages with the guide groove 33 via the split groove 36 .

As shown in FIG. 10, a collar 37 having a screw hole 37a is used instead of the guide washer 35 with the protrusion 34, and a long hole 38 is used instead of the split groove 36.
Alternatively, a machine screw 39 may be engaged with the guide groove 33 through the screw hole 37a instead of the protrusion 34.

Since the device of the present invention is constructed as described above, the seventh
If the lever 21 with an eccentric cam is rotated downward in the direction of arrow A from the state shown in the figure, the wire 26 is pulled up via the metal fitting 27 by the action of the eccentric cams 23, 23' integrated with the lever 21, and the wire 26 is pulled up via the metal fitting 27. The end screw fitting 28 also rises together with the nuts 30 and 31. Therefore, the lifting wheel 18 is raised via the disc spring washer 29 as shown in FIG.
As a result of the pressure contact, the handle post 16 and the lifting head 18 are fixed to the front Hawk stem 5 due to the wedge action of the inclined surface 17.

That is, in FIG. 3, the handle post 16
When a force in the direction of arrow B is applied to the handlebar post 16 and a force in the direction of arrow C is applied to the lifting wheel 18, a force in the direction of arrow D is applied to the handle post 16 due to the action of the opposing inclined surface 17, and a force in the direction of arrow D is applied to the lifting wheel 18. As a result of the force acting in the direction of arrow E, the handle is fixed to the front Hawk stem 5. In this case, since the protrusion 34 or the small screw 39 is engaged with the guide groove 33 and positioned, the handlebar is fixed in the correct position with respect to the bicycle frame.

Next, to fold the handle, the lever 21 is rotated upward as shown by arrow F in FIG.
In this case, the wire 26 is lowered by the action of the eccentric cams 23, 23', and a gap S is created between the pulling forceps 18 and the handle post 16 as shown in FIG. 7, resulting in the wedge effect described above. disappears, and the handle post 16 and the lifting head 18 can now freely slide relative to the front Hawk stem 5.

Therefore, as shown in FIG. 9, after pulling up the handle post 16 and the lifting head 18,
By rotating the handle post 16 as shown by arrow G, the handle portion can be folded against the bicycle frame.

In this case, the lifting head 18 and the handle post 1
Since it is connected to the handle post 16 by a wire 26, it can be rotated freely, but the handle post 16
There is no risk of it coming off the bicycle frame. In addition, when pulling up the handle post 16, the lower end of the guide groove 33 stops in the middle of the lifting wheel 18, so that the lifting wheel 18 does not reach the front hawk stem 5.
There is no danger of it falling out.

To assemble the folded handle, pull up the handle post 16 from the state shown in FIG. After alignment, handle post 16
7 into the front hawk stem 5, and at an appropriate position, rotate the lever 21 downward in the direction of arrow A in FIG. 7 as described above.

In addition, in the device of the present invention, the disc spring washer 29 used between the lifting screw 18 and the lock nut 30 can have a large capacity load capacity in a relatively small space. Ideal for locations that require In other words, a disc spring washer can be made with the characteristic that the restoring force becomes nearly horizontal as the displacement increases, as shown by curve H in Figure 12, so if multiple disc spring washers of this type are stacked and used, In other words, if you stack them as shown in Figure 11 a to obtain a stroke, and stack them as shown in Figure 11 b to obtain a larger restoring force, you can achieve a wider stability region (curve H). horizontal area) and an appropriate stroke, the device of the present invention, which includes the disc spring washer 29, has a wide adjustment range for the adjustment nut 31 and provides stable tightening force. Can be done.

Furthermore, the eccentric camshaft 2 used in the device of this invention
2 and the rotation angle of the lever 21 integrated with the eccentric cam 2.
The relationship between the amount of vertical movement of the eccentric camshaft 22 due to the action of 3 and 23' is shown by a sine curve as shown in Fig. 13, and as the amount of vertical movement decreases during tightening, the effect of stabilizing tightening is increased. be able to.

That is, although disc spring washers and eccentric cam mechanisms are well-known technologies, by skillfully combining the characteristics of each, the present invention provides a handle post fixing device with a stable tightening mechanism.

When the disc spring washer is not used, the force of the lever 21 is directly transmitted to the lifting forceps 18, so the relationship between the rotation angle of the lever 21 and the lifting force is as shown in the 14th
If the adjustment nut 31 is adjusted too delicately, as shown by the broken lines a, b, and c in the figure, the result will be as shown by the broken line a, and a large force will be applied to the eccentric camshaft 22, wire 26, and its head. There is a risk of damage due to damage. Furthermore, when the lever 21 is stopped halfway to the top dead center of the eccentric camshaft 22, the lever 21
This poses a safety problem because there is a risk that 1 will return. On the other hand, if the tightening is loosened, the fixing force of the handle post 16 to the front Hawk stem 5 will be insufficient as shown by the broken line c, which will cause problems in use. A solid line J in FIG. 14 is a characteristic curve when a disc spring is used.

In addition, it is possible to use a spring washer, compression coil spring, etc. instead of the disc spring washer 29, but since the cam mechanism of the device of the present invention is subject to an extremely large load, using a spring washer or coil spring would not be possible. The relationship between the lifting force and the spring displacement is very angular and linear. Therefore, adjustment of the adjusting nut 31 becomes extremely difficult, making it unsuitable for practical use.

Since the device of the present invention is as described above, the following effects can be obtained.

(1) Rotate the lever 21 with eccentric cam downward,
By simply pulling up the handle post 16 and rotating the handle post 16 along the inclined surface 17, the handle part of the bicycle can be folded easily and in a short time.

(2) When the handle part is folded, the handle post 16 is connected to the lifting head 18 in the front Hawk stem 5 via the wire 26, and to prevent it from falling apart, it can be tied to the bicycle frame with a string or the like as in the conventional case. There's no need.

(3) A guide groove 33 is provided in the handle post 16 and the lifting head 18, and a protrusion 34 or machine screw 39 that engages with the guide groove 33 is fixed to the head of the frame, so when assembling the handle post 16 to an appropriate position inside the front hawk stem 5 and turn the lever 21 in the tightening direction, the handle post 1
The front of 6 is always facing the front of the bicycle,
It can be set without any adjustment.

(4) When the bicycle is assembled, the folding part is hidden inside the front hawk stem 5, so it can be assembled into a sleek appearance just like a normal handlebar post.

[Brief explanation of the drawing]

Figure 1 is an exploded perspective view of the device of the present invention, Figure 2 is a side view of its handle post, Figure 3 is a rear view of the same, Figure 4 is a vertical sectional view of Figure 3, and Figure 5 is its handle. A cross-sectional view of the post, Figure 6 is a partial cross-sectional view of the upper half of the wire, Figure 7 is a partially cross-sectional side view of the handle post inserted into the front Hawk stem, and Figure 8 is its fixed state. 9th side view showing
The figure is a front view showing the folded state of the handle post, FIG. 10 is an exploded perspective view of the head part showing another embodiment, FIGS. The figure shows the load characteristics of the disc spring washer. Figure 13 shows the relationship between the rotation angle of the lever with an eccentric cam and the vertical movement of the eccentric cam shaft. Figure 14 shows the rotation angle of the lever with the eccentric cam and the lifting force. FIG. 1...Headpipe, 5...Front Hawk Stem,
15... Handlebar, 16... Handle post, 17... Inclined surface, 18... Pulling lever (handle post), 21... Lever with eccentric cam,
22... Eccentric cam shaft, 23, 23'... Eccentric cam,
26...Wire, 27...Cable end connection fitting, 28
...Cable end screw fitting, 29... Belleville spring washer, 30...
...Lock nut, 31...Adjustment nut, 33...
Guide groove, 34... protrusion, 35... guide washer, 36... split groove, 37... collar, 38...
...long hole, 39...machine screw.

Claims (1)

[Scope of utility model registration request] The handle posts 16 and 18, which are divided into two by the inclined surface 17, are inserted into the front Hawk stem 5, and the lever 2 with an eccentric cam is pivotally supported on the handle post 16.
In the device in which the handle posts 16 and 18 are fixed or released from the front Hawk stem 5 by the operation of 1, the handle post 1 is attached to the eccentric cam shaft 22 of the lever 21 inserted through the head of the handle post 16.
6, 18, and the lower part of the wire 26 is passed through the bottom of the lifting head 18 at the lower part of the handle post.
The nuts 30 and 31 are screwed into the protruding screw portion 28a via the disc spring washer 29, and the handle post 16
A guide groove 33 is provided on the side surface of the lifting head 18, and a protrusion 3 protruding from the bicycle frame side is provided.
4 is fitted into the guide groove 33.