JP2001001973A - Foldable bicycle with auxiliary wheel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To move a foldable bicycle smoothly through a hand auxiliary wheel with the bicycle folded by disposing the hand auxiliary wheel on the foldableg bicycle on the upper side than a line connecting the respective center lines of front and rear wheels. SOLUTION: This foldable bicycle is foldable in two sections at a folding part 8 formed on the intermediate part of a frame 10, wherein a hand auxiliary wheel 1 is mounted on a head pipe 2 using a bolt or the like through a clamp 3 at a higher position than a line A connecting the respective center lines of a front wheel 4 and a rear wheel 5. In folding the bicycle, a handlebar 6 is folded, a sheet boss 9 is lowered, the frame 10 is folded at the folding part 8. While the front wheel 4 and the rear wheel 5 are being grounded, they are reversed vertically, and the auxiliary wheel 1 is grounded. By facing the front wheel 4 and the rear wheel 5 forward and rolling the auxiliary wheel 1 rearward under this condition, it is possible to move the folded bicycle smoothly.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a structure of a folding bicycle.

[0002]

2. Description of the Related Art In a conventional folding bicycle with auxiliary wheels, auxiliary wheels are arranged near the lower side of a chain ring.

[0003]

Therefore, in order to roll the crank arm in a folded state without rotating the crank arm, the auxiliary wheels are set to the front and the front and rear wheels are set so that the rotation of the rear wheels is in the same direction as when the vehicle is traveling forward. I had to roll as backwards.

[0004] However, when the auxiliary wheel having a small wheel diameter is set at the front, there is a problem in that it is not easy to get over a projection on a rough road surface and the rolling is difficult.

An object of the present invention is to provide a folding bicycle with auxiliary wheels that can smoothly roll with the front and rear wheels having large wheel diameters and the auxiliary wheels as rear.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, according to the present invention, an auxiliary wheel is mounted at a position higher than a line connecting center axes of front and rear wheels, and the bicycle is turned upside down in a folded state. Then, even when the front and rear wheels are set to the front and the auxiliary wheels are set to the rear, the rolling can be performed without rotating the crank arm.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows the auxiliary wheels attached to the head pipe.
FIG. 2 is a detailed view of an auxiliary wheel mounting portion of the first embodiment, and FIG. 3 is a state in which the first embodiment is folded so that front and rear wheels and auxiliary wheels are grounded. FIG. 4 shows a second embodiment in which auxiliary wheels are mounted on a seat tube. FIG. 5 is a detailed view of an auxiliary wheel mounting portion of the second embodiment. FIG. And the auxiliary wheels are grounded.

In the first embodiment, as shown in FIG. 1 and FIG.
2 is attached to the head pipe 2 at a position higher than a line A connecting the central axes of the front wheel 4 and the rear wheel 5. Fold the handle 6, lower the seat post 9, and move the frame 1
FIG. 3 shows a state in which the front wheel 4 and the rear wheel 5 are turned upside down while the front wheel 4 and the rear wheel 5 are grounded, and the auxiliary wheel 1 is grounded, where 0 is folded from the frame folding portion 8.

In the state shown in FIG. 3, when the front wheel 4 and the rear wheel 5 are rolled forward and the auxiliary wheel 1 is rolled backward, the rotation direction of the rear wheel 5 coincides with the forward rotation during traveling, and the crank arm 7 is rotated. Front wheel 4 that can be rolled without
Since the rear wheel 5 and the rear wheel 5 are in front, the protrusion can smoothly get over, and the rear auxiliary wheel 1 follows in a dragged state, and it is easy to carry.

In the second embodiment, as shown in FIGS. 4 and 5, the auxiliary wheel 13 is rotatably engaged with the seat pin 15, and is fixed to the seat tube 14 by tightening the lever 16. FIG. 6 shows a state in which the seat post 9 is removed by loosening the lever 16, the handle 6 and the frame 10 are folded upside down, and the seat post 9 is inserted from the opposite side of the seat tube 14.

The ease of carrying in the state shown in FIG. 6 is the same as that of the first embodiment, but the safety is excellent because the saddle 17 covers the chain ring 18.

In the first embodiment, the bolts 11 and the nuts 12 are removed, and in the second embodiment, the auxiliary wheels can be removed depending on the use of the bicycle by replacing the seat pins without the auxiliary wheels 13. .

[0013]

As apparent from the above description, the present invention has the following effects.

Since the front and rear wheels can be rolled forward and the auxiliary wheels can be rolled rearward, it is possible to smoothly ride over bumps on a rough road surface, and the bicycle can be easily pushed and carried.

[Brief description of the drawings]

FIG. 1 is a side view of a traveling state according to a first embodiment of the present invention.

FIG. 2 is a detailed view of an auxiliary wheel mounting portion according to the first embodiment.

FIG. 3 shows a folded state of the first embodiment.

FIG. 4 is a side view of a traveling state according to a second embodiment of the present invention.

FIG. 5 is a detailed view of an auxiliary wheel mounting portion according to a second embodiment.

FIG. 6 shows a folded state of the second embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Auxiliary wheel 2 ... Head pipe 3 ... Stopper 4 ... Front wheel 5 ... Rear wheel 6 ... Handle 7 ... Crank arm 8 ... Frame folding part 9 ... Seat post 10 ... Frame 11 ... Bolt 12 ... Nut 13 ... Auxiliary wheel 14 ... Seat tube 15 ... Seat pin 16 ... Lever 17 ... Saddle 18 ... Chain ring A ... Line connecting the center axes of the front and rear wheels

Claims (5)

[Claims] 1. A folding bicycle with auxiliary wheels, wherein the auxiliary wheels for pushing in a folded state are arranged above a line connecting the central axes of the front and rear wheels. 2. The bicycle according to claim 1, wherein the auxiliary wheel is attached to the head pipe. 3. The bicycle according to claim 1, wherein the auxiliary wheel is attached to an upper end of the seat tube. 4. The bicycle according to claim 1, wherein the auxiliary wheels are detachable. 5. The bicycle according to claim 1, wherein the saddle is detached, and the saddle is attached so as to cover the chain ring from a lower side in a running state.