JPH0220476B2 - - Google Patents

Description

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

Conventionally, portable sports cars with diamond-shaped frames require special tools to disassemble, fold, or assemble, or the work is cumbersome and complicated, requiring a lot of time and considerable skill. There was a problem.

The present invention was made to solve the above-mentioned problems, and there is no need to remove parts with special tools, and it is possible to easily fold the sports car by simply loosening one fastening part. 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 bicycles.

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, 3 is the front fork, 4 is the head pipe, 5 is the handle, 6 is the upper pipe, 7 is the lower pipe, 8 is the crankshaft, 9 is the crank arm, 10 is the chain stay, 11 is a vertical pipe, 12 is a backhawk, 13 is a seat post, and 14 is a saddle.

In the present invention, a substantially perpendicular center pipe 15 is provided in the middle part of the bicycle frame, and an upper center pipe 16 and a lower center pipe 17 are provided above and below the center pipe 15, respectively. The rear end of the upper pipe 6 is connected, and the rear end of the lower pipe 7 is connected to the lower part of the center pipe 15 to form the front half frame A of the bicycle.
form.

In addition, the upper central pipe 16 and the lower end of the vertical pipe 11 are connected, and a back hawk 1 is attached to a bracket 11a that is provided on the upper part of the vertical pipe 11 and protrudes rearward.
The upper ends of 2 are connected by bolts 18 and nuts 19, as shown in FIG.

Further, the front end of a chain stay 10 having a hanger pipe 20 at the front as shown in FIG. 12 and the lower end thereof are connected by bolts 21 to form the rear half frame B of the bicycle.

Further, as shown in detail in FIGS. 3 to 5, continuous chevron teeth 24 arranged radially are formed in a ring shape on the end surfaces of the upper flange portion 22 and lower flange portion 23 of the center pipe 15, 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 16, and the cylindrical portion 26 that fits into the center pipe 15 and the cylindrical portion 26 are continuous below the cylindrical portion 26. An apertured cylindrical portion 2 having a smaller diameter than the cylindrical portion 26 integrally formed with
7 protrudes below the upper center pipe 16, and furthermore, a bolt insertion hole 28a is provided in the upper part of the center pipe 16.
Fix the top lid 28 having the following properties.

Further, the end face of the upper flange portion 29 of the lower central pipe 17 is also formed with continuous chevron-shaped teeth 24 that mesh with the continuous chevron-shaped teeth 24 provided on the lower end face of the central pipe 15, and a cylindrical portion that fits into the central pipe 15. 3
A bolt pedestal 31 having a bolt insertion hole 31a is fixed inside the cylindrical portion 30.

After fitting the cylindrical portions 26, 27, and 30 of the second half frame B into the center pipe 15 of the first half frame A from above and below, the bolts 32 are inserted from below the lower center pipe 17, and the bolt insertion holes 31a, 28a are inserted into the center pipe 15 of the first half frame A. is passed through the bolt 32, and the nut 33 is screwed into the upwardly protruding threaded portion 32a of the bolt 32.

Since the bicycle frame of the present invention is configured as described above, by loosening the nut 33, the first half frame A and the second half frame B can be connected to the center pipes 15, 16,
It can be freely rotated as shown by arrow C around the center line L of 17 (see FIG. 2).
In other words, if the nut 33 is loosened by more than twice the height of the continuous chevron teeth 24 and rotated in the direction of arrow C, the upper and lower center pipes 16 and 17 will be rotated in the direction of the arrow C. The chevron-shaped teeth 24 are moved up and down by the height of the tooth by the action of the slope of the chevron-shaped teeth 24, and the meshing of the chevron-shaped teeth 24 is released. In this case, in the latter half frame B, the upper and lower ends of the backhawk 12 are connected by bolts 18 and 21, respectively, so the upper and lower center pipes 1 are connected to each other.
6 and 17 can be sufficiently absorbed.

Therefore, in order to put the 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 half frame B in a straight line and tighten the nut 33. Natsu 33
When tightened, the upper and lower center pipes 16 and 17 are crimped to the middle center pipe 15 by the bolts 32, so that the upper and lower continuous chevron teeth 24
The meshing parts of the two are completely in contact. Therefore, the first half frame A and the second half frame B are completely integrated.

Next, to fold this bicycle, Natsuto 33
2, and rotate either the front or rear frame around the center line L, as shown in FIG. Note that in order to fix the frame in this folded state, the nut 33 may be tightened in the same manner.

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

(1) In the frame of the present invention, the cylindrical portions of the lower center pipe 17 and the upper center pipe 16 are inserted and overlapped into the center pipe 15 of the first half frame A, and continuous chevron teeth 24 are formed on the joint flange portions of each. The bolt 32 and nut 3 are engaged with each other.
Since it is fastened at 3 points, there is only one fastening point, making the operation simple and easy. Furthermore, when folding, the front and rear frames can be rotated around the axis L by releasing the fastening force of the bolts. Moreover, in this case, there is no need to remove other parts, so it can be folded instantly and extremely easily. The same goes for assembly.

(2) Since the teeth of the continuous chevron-shaped teeth 24 that mesh with each other on the center pipe 15 of the first half frame and the upper and lower center pipes 16 and 17 are arranged radially, the axis of the frame can be adjusted simply by tightening the overlapped cylinders up and down. You can always keep your mind in the right alignment. Furthermore, the fixed frame does not cause backlash or shaft wobbling.

(3) 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 drawings]

FIG. 1 is a side view showing the entire bicycle having the frame of the present invention, FIG. 2 is a side view showing the bicycle in a folded state, FIG. 3 is an exploded view showing the structure of the bicycle frame of the present invention, and FIG. The figure is a side view showing a part of the main part in cross section, and FIG. 5 is a perspective view of the engaging part. A...first half frame, 4...head pipe, 6
... Upper pipe, 7 ... Lower pipe, B ... Second half frame, 10 ... Chain stay, 11 ... Vertical pipe, 12 ... Back hawk, 15 ... Center pipe, 16 ... Upper center pipe, 17 ... Lower part Center pipe, 20...hanger pipe, 24...continuous chevron teeth, 32...bolt, 33...nut.

Claims (1)

[Claims] 1. A substantially vertical center pipe 15 is provided in the middle of the bicycle frame, and an upper center pipe 16 and a lower center pipe 17 are provided above and below the center pipe 15, respectively, and the upper pipe 6 and the lower pipe are connected to the head pipe 4. The rear ends of the pipes 7 are connected to the center pipe 15 to form the first half frame A, the upper center pipe 16 and the lower end of the vertical pipe 11 are connected, and the upper end of the vertical pipe 11 and the upper end of the back hawk 12 are connected with bolts. The front end of a chain stay 10 having a hanger pipe 20 at the front is connected to the rear surface of the lower central pipe 17, and the rear part of the chain stay 10 and the lower end of the back hawk 12 are bolted together to form a second half frame B. The central pipe 15, the upper and lower central pipes 16,
This folding bicycle frame is characterized in that continuous chevron-shaped teeth 24 arranged radially are formed in a ring shape on the joining surface with the cylindrical frame 17, and the folding bicycle frame is made freely foldable by tightening or releasing the meshing parts of these chevron-shaped teeth 24.