JPS6248639B2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a folding frame for a two-wheeled vehicle.

This invention can be easily folded into a small size, is lightweight and convenient for transportation and storage, is easy to manufacture and suitable for mass production, and has sufficient strength and durability.
The aim is to provide a folding two-wheeled vehicle that can run stably.

Hereinafter, this invention will be explained with reference to drawings showing examples. The front end of a lower pipe 1 whose rear part is integrally formed with a chain stay 2 is pivoted to a bracket 11 attached to a head pipe 10 by a support shaft 13.
The lower end of a pipe-shaped vertical pipe support frame 3 is fixed to a predetermined position of the lower pipe 1, the front end of a back fork 4 is fixed to the back of the upper end of this vertical pipe support frame 3, and the rear end of this back fork 4 is attached to the back of the chain stay 2. Fix it to the rear claw 5 of the end, insert the lower half of the vertical pipe 6 inside the vertical pipe support frame 3, and connect the lower end to the vertical pipe support frame 3 with the support shaft 7, and the front side of the vertical pipe support frame 3. The front end of the upper pipe 16 is provided so that it can rise and fall forward through a longitudinal notch elongated hole 3a provided on the side, and whose rear end is pivoted by a support shaft 15 to a bracket 14 mounted on the vertical pipe 6, to the head pipe 10. It is attached to the attached bracket 11 by the support shaft 12,
An engagement protrusion 8 is implanted in the back of the bracket 14 on the vertical pipe 6, and a depression prevention claw 9 is engaged with the engagement protrusion 8.
is mounted on a vertical pipe support frame 3, and a depression prevention claw device 9a is provided.

Reference numeral 17 denotes a handle, which is bent from the base end to both sides when folded. 18 is the seat post, 19 is the front wheel, 20 is the front fork, 21 is the rear wheel, 22
A hanger bracket is provided by extending the lower end side wall plates of the vertical pipe support frame 3 downward.

Since the frame of this invention is as described above, in the assembled state as shown in FIG. When the vertical pipe 6 is disengaged from the engagement protrusion 8 by resisting the spring 25, for example, around the supporting shaft 24
becomes free, and if, for example, force is applied to Sabal 26 and the vertical pipe 6 is pushed forward, the upper pipe 1
6. The head pipe 10 has its respective support shafts 15, 12,
13 about the axis, and with the handle 17 unfolded and erected, the front wheel 19 is rotated below the lower pipe 1 to partially connect it, as shown in FIG. Then, the handle 17 is released, rotated to both sides, and then rotated backwards so that it can be folded compactly as shown. Assembly into running condition is extremely simple by reversing the procedure.

As described above, the frame of this invention consists of a fixed part consisting of at least the lower pipe 1 and the vertical pipe support frame 3, and a movable part of the vertical pipe 6, the upper pipe 16, and the head pipe 10 whose ends are connected by mutually parallel support shafts. Therefore, by releasing the engaging protrusion 8 of the movable part from the depression prevention claw 9 of the fixed part and applying force, the entire movable part can be rotated, and the upper side of the lower pipe 1 and The vertical pipe 6, the upper pipe 16, and the head pipe 10 are brought close to each other in parallel to the lower side as shown in the figure, and can be easily and compactly folded.

Next, the vertical pipe support frame 3 is welded to the lower pipe 1, and the vertical pipe 6, whose lower end is pivotally supported, is fitted into the vertical pipe support frame 3 and held. No rattling,
In particular, when the back fork 4 and the chain stay 2 are connected in a triangular manner by the lower pipe 1 and the vertical pipe support frame 3 as in the embodiment, sufficient strength and rigidity can be obtained in the fixed part, and the movable part can be By fitting and holding the vertical pipe 6 into the vertical pipe support frame 3,
The head pipe 10 and the upper pipe 16 are held in a triangular shape with the lower pipe 1 and the vertical pipe support frame 3 as one side, and maintain sufficient strength and rigidity compared to a single pipe frame that simply serves as the upper pipe and lower pipe. However, it is possible to achieve a significant weight reduction.

As a result, the entire frame can be folded into a lightweight and compact size, making it convenient to transport and store, and providing a folding bicycle that is highly productive in its folding operations, and that is robust and has excellent running stability and durability. can.

[Brief explanation of the drawing]

FIG. 1 is a side view of a folding bicycle assembled with the frame of the present invention, FIG. 2 is a side view of the folded bicycle, and FIGS. 3 and 4 show the vertical pipe and vertical pipe support frame as shown in FIG. FIG. 3 is a partial explanatory diagram of a state corresponding to FIG. 2; 1... Lower pipe, 2... Chain stay, 3... Vertical pipe support frame, 3a... Notched long hole, 4... Back fork, 5... Rear claw, 6... Vertical pipe, 7... Support shaft, 8...
Engagement protrusion, 9...Downward restraint claw, 9a...Downward restraint claw device, 10...Head pipe, 11...Bracket, 1
2, 13... Support shaft, 14... Bracket, 15... Support shaft, 16... Upper pipe, 17... Handle, 18... Seat post, 19... Front wheel, 20... Front fork,
21...Rear wheel, 22...Hanger bracket.

Claims (1)

[Claims] 1. The front end of the lower pipe, whose rear part is integrally molded with the chain stay, is pivoted to the bracket attached to the head pipe, and the lower end of the pipe-shaped vertical pipe support frame is fixed to a predetermined position on the lower pipe. Fix the front end of the back fork to the back of the upper end, fix the rear end of this back fork to the rear end of the chain stay, insert the lower half of the stand pipe inside the vertical pipe support frame, and pivot the lower end to the vertical pipe support frame. , the front end of the upper pipe is attached to the head pipe, and the rear end is pivotally attached to the bracket attached to the vertical pipe, and the front end of the upper pipe is attached to the head pipe. A folding frame for a two-wheeled vehicle, characterized in that a folding frame for a two-wheeled vehicle is provided with a claw device for preventing the vertical pipe from falling down on the back of a bracket on the vertical pipe.