JPS5839108B2 - folding bicycle frame - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a frame for a folding bicycle.
It can be assembled instantly when in use, and can be simply and easily folded for compact storage when being carried or not in use.

Conventionally, folding bicycles have had the disadvantage that they are difficult to fold and assemble, and that it takes time to carry them around or fold them when not in use.

The present invention solves the above-mentioned drawbacks, has a strong structure, and can be folded quickly.

Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings. A hanger bracket 3 having a hanger part 2 is provided at the middle part of the lower frame 1, and a head pipe is attached to a shaft 4 attached to the front end of the lower frame 1. A front frame 9 integrally formed with the part 8 is rotatably supported, and a pawl 10 at the rear end of the lower frame 1 supports a rear wheel axle 11, and a hanger bracket 3
A vertical pipe 15 is rotatably supported on a shaft attached to the vertical pipe 15, and a front support stay 18 is rotatably supported between a shaft 16 attached to the vertical pipe 15 and a shaft 17 attached to the front frame 9. A rear support stay 20 is rotatably supported between the shaft 16 of the vertical pipe 15 and the rear wheel shaft 11, and has an indirect shaft 19 whose intermediate portion bends and rotates. A front frame 9 integrally molded with a head pipe part 8 to which a front fork 7 supporting a handle post 5 and a front wheel axle 6 is attached is rotatably attached to a shaft 4 attached to the front end of a lower frame 1. The rear part of the lower frame 1 is divided into two parts,
The pawl 10 at the rear end supports the rear wheel axle.

In addition, the hanger bracket 3 of the lower frame 1 has a shaft 12.
is provided to rotatably support the vertical pipe 15 to which the saddle 13 and the seat post 14 are attached, and the vertical pipe 1
A bracket having a shaft 16 is provided in the middle of the shaft 1.
6 and the shaft 17 of the bracket provided at the intermediate part of the front frame 9
The front support stay 18 is rotatably supported between the shaft 16 of the vertical pipe 15 and the rear support stay 20, which has an indirect shaft 19 with a stopper whose intermediate portion rotates only upward. It is rotatably supported between the wheel shaft 11.

In the present invention configured as described above, as shown in FIG. 2, the rear support stay 20 is pivotably supported at both ends and has an indirect shaft 19 whose intermediate portion is bent and rotated. By pulling it up, the rear support stay 20 is bent at the indirect shaft 19, and as shown in FIG. Then, each axis 4, 11, 12, 16,
17, tilts, and eventually the front wheels 21 and rear wheels 22
is approaching, and the entire frame can be folded into a compact size.

At this time, by covering the indirect shaft 19 disposed in the middle of the rear support stay 20 with the covering device 24 with a stopper 23, not only can complete assembly be performed, but also the covering device 24 can be used when folding. Needless to say, when this is removed, the indirect shaft 19 can freely bend and rotate upward, further ensuring safety.

Conversely, when assembling, push down the rear support stays 20 as if pushing each frame apart, stretch it in a straight line, and assemble.

Further, it goes without saying that a stopper mechanism is provided for the indirect shaft 19 to prevent it from being bent too far downward.

As described above, according to the present invention, the entire frame is made of metal materials with high strength and reliability, and there is no need to loosen or remove screws or attached parts, and the rear support stay can be pulled up with one hand. It is now possible to provide a bicycle frame that can be easily folded or assembled into a compact size in an instant with one simple and easy push-down operation.

[Brief explanation of drawings]

FIG. 1 is a side view showing one embodiment of the present invention. FIG. 2 is a partial side view showing a state in the middle of folding according to the present invention. FIG. 3 is a side view showing the folded state according to the present invention. FIG. 4 is a side sectional view of a wrapping device used in another embodiment of the present invention. FIG. 5 is a partial side sectional view of a state in which a covering tool is wrapped around the indirect shaft in the rear support stay. FIG. 6 is a partial side view of the state in which the covering device is removed from the joint shaft in the rear support stay. In the figure, 1: lower frame, 2: hanger section, 3: hanger bracket, 4: shaft, 5: handle post, 6: front wheel axle,
7: Front fork, 8: Head pipe section, 9: Front frame,
10: Pawl, 11: Rear wheel axle, 12: Axle, 13: Saddle,
14 Nijito post, 15: Vertical pipe, 16: Shaft, 1γ
: shaft, 18: front support stay, 19: indirect shaft, 20: rear support stay, 21: front wheel, 22: rear wheel, 23: stopper, 24: covering device.

Claims (1)

[Scope of Claims] 1. A hanger bracket having a hanger part is provided in the middle part of the lower frame, and the front frame integrally molded with the head pipe is rotatably supported on a shaft attached to the front end of the lower frame. , the claw at the rear end of the lower frame supports the rear wheel axle,
A vertical pipe is rotatably supported on the shaft attached to the hanger bracket, and a front support stay is rotatably supported between the shaft attached to the vertical pipe and the shaft attached to the front frame. A folding bicycle characterized in that a rear support stay having an indirect shaft that is pivotably supported and whose intermediate portion bends and rotates is rotatably supported between a vertical pipe shaft and a rear wheel shaft. flame. 2. Claim 1, characterized in that the intermediate portion has an indirect shaft with a stopper that bends and rotates only in an upward direction.
Folding bicycle frame as described in section. 3. The folding bicycle frame according to claim 1, wherein the indirect shaft disposed in the middle of the rear support stay is removably covered by a covering device with a stopper.