JPS59230878A - Folding bicycle frame - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention primarily relates to a folding frame for a portable sports vehicle.

Traditionally, portable sports cars with diamond-shaped frames are
There were 11 problems in that special workers were required to disassemble, fold, or assemble, or the work was cumbersome or complicated, requiring a lot of time and considerable skill.

The present invention was made in order to solve the above-mentioned problems, and there is no need to remove parts with special tools, and it can be easily and easily folded by simply loosening the fastened parts. The object of the present invention is to provide a folding bicycle frame that does not impair the lightness, frame rigidity, durability, etc. required for a vehicle.

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

In the figure, 1 is the front wheel of the bicycle, 2 is the rear wheel, 8 is the front fork, 4 is the head pipe, 5 is the handlebar, 6 is the upper pipe, F is the lower pipe, 8 is the crankshaft, 9 is the crank arm slO is the chain stay , 11 is a vertical pipe, 12 is a back hawk, 1
8 is a seat post, and 14 is a saddle.

In the present invention, a substantially vertical center pipe 15 is provided in the middle part of the bicycle frame, and this center pipe 15
An upper center pipe 16 and a lower center pipe 17 are provided which fit on the upper and lower sides of the pipe, respectively, and the rear end of the upper vibro is connected to the upper part of the center pipe 15. Connect the ends to form the front half frame A of the bicycle.

In addition, the upper center pipe 16 and the lower end of the vertical pipe 11 are connected, and the upper end of the back hawk 12 is connected to the bracket 11a which is provided on the upper part of the vertical pipe 11 and protrudes rearward, as shown in FIG. and are connected by a nut 19.

Further, on the rear surface of the lower center pipe 17, as shown in FIG.
0, and the screw hole 10a provided in the rear pawl of this chainstay 10 and the lower end of the back hawk 12 are connected with a bolt 21, and the rear half frame B of the bicycle is connected.
form.

In addition, as shown in detail in FIGS. 8 to 5, 1 center pipe 1
Continuous chevron-shaped teeth 24 arranged radially are formed in a ring shape on the end surfaces of the upper seven rung portions 22 and the lower flange portions 28 of No. 5, respectively.

Continuous angular teeth 24 that mesh with the continuous angular teeth 24 are also formed on the end face of the lower flange portion 25 of the upper center pipe 16e, and are continuous with the cylindrical portion 26 that fits into the center pipe 15 and below the cylindrical portion 26. An apertured cylindrical part 27 having a smaller diameter than the cylindrical part 26 formed integrally with the cylindrical part 27 is provided to protrude below the upper center pipe 16, and an upper cover 28 having a bolt insertion hole 28a is fixed to the upper part of the center pipe 16.

Further, continuous chevron-shaped teeth 24 provided on the lower end surface of the center pipe 15 are also provided on the end surface of the upper seven rung portions 29 of the lower center pipe 17.
A cylindrical portion 80 that fits into the center pipe 15 is formed to protrude above the lower center pipe 17, and a bolt insertion hole 8 is formed inside the cylinder s80.
1a) Fix the pedestal 81.

Then, the cylindrical portions 21, 27.80 of the second half frame B are passed through the central pipe 15 of the first half frame A through the ribs 28a, and the nuts 88 are screwed into the upwardly protruding threaded portions 2N1a of the bolts 82.

Since the bicycle frame of the present invention is constructed as described above,
By loosening the nut 88, the first half frame A and the second half frame B can be moved to the center sr of the center pipes 15, 16°17, <
It can be freely rotated as shown by arrow 0 around the center (see FIG. 2).

In other words, the nut 8 is more than twice the height of the peak of the continuous chevron tooth 24.
8 and rotate it as shown by arrow 0, the upper and lower center pipes 16.
17 chevron teeth 24 due to the action of the slope of the chevron teeth 24,
The mesh of the chevron-shaped teeth 24 is released by moving up and down by the height of the teeth. In this case, the second half frame B is Baraku Hawk 1.
Since the upper and lower parts 6 of 2 are connected by poles 18 and 21, the upper and lower center pipes 16 and 17 described above
A slight vertical movement can be sufficiently absorbed.

Therefore, in order to put a bicycle having the frame of the present invention into a running state, as shown in FIG. 1, it is sufficient to place the front half frame A and the rear frame B in a straight line state and tighten the nut 88. When the nuts 88 are tightened, the upper and lower central pipes 16 and 17 are pressed against the intermediate central pipe 15 by the bolts 82, so that the meshing portions of the upper and lower continuous chevron teeth 24 are brought into close contact with each other. Therefore, the first half frame A and the second half frame B are completely integrated.

Next, to fold the bicycle, loosen the nut 88 and rotate either the front or rear frame around the center line, as shown in FIG.

Note that in order to fix the frame in this folded state, it is sufficient to tighten the nut 88 in the same way.

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

(1) The frame of the present invention has a lower center pipe 17 and an upper center pipe 1 in the center pipe 15 of the first half frame A.
The cylindrical parts 6 are inserted and polymerized together, and the respective joints 7
Since the continuous chevron teeth 24 formed on the flange portion are engaged with each other and fastened with the bolt 82 and nut 38, there is only one fastening point, making the operation simple and easy. When folding, the front and rear frames can be rotated around their axis by releasing the bolt fastening force. Moreover, in this case, there is no need to remove other parts, so it can be folded instantly and easily.

The same goes for assembly.

(2) Continuous chevron teeth that mesh with each other between the center pipe 15 of the first half frame and the center pipes 16 and 17 of the upper and lower parts! Since the 14 teeth are arranged radially, the axes of the frame can always be correctly aligned by simply tightening the stacked cylinders up and down. Furthermore, the fixed frame does not cause backlash or shaft wobbling.

(8) Since the center pipe 15 of the first half frame and the center pipes 16 and 17 of the upper and lower parts of the second half frame are concentrically connected in the middle of the bicycle, this does not impair the light appearance required of a sports car. Not at all.

[Brief explanation of the drawing]

Fig. 1 is a side view showing the entire bicycle having the frame of the present invention, Fig. 2 is a side temperature diagram showing the bicycle in a folded state, Fig. 8 is an exploded view showing the structure of the bicycle frame of the present invention, and Fig. 4 is an exploded view showing the structure of the bicycle frame of the present invention. A side view showing a part of the main part in cross section, and FIG. 5 is a perspective view of the meshing part. A・^First half frame 4...Head vibro...
・Upper pipe 7...Lower pipe B...Late frame 1o...Chain stay 11...Standing vibe 12...Back hawk 15...Center pipe 16...Upper center pipe 17...・Lower center pipe 2o... Hanger pipe 24...
Continuous angle tooth 82...Bolt 88...Nut Fig. 4

Claims (1)

[Claims] 1. A substantially vertical center pipe is provided in the middle part of the bicycle frame, and an upper center pipe and a lower center pipe are provided above and below the center knob, respectively, to form a front half frame including the center pipe, A second half frame including the upper center pipe and the lower center pipe is formed, and continuous chevron-shaped teeth arranged radially are formed in a ring shape on the joint surfaces of the center pipe and the upper and lower center pipes, and these chevron-shaped A folding bicycle frame is characterized in that it can be folded freely by tightening or releasing meshing parts of teeth.