JPH05155375A - Bicycle drive telescopic crank and eccentric introduction plate of eccentric moving device thereof - Google Patents

Abstract

PURPOSE:To enable a bicycle to be driven without the fatigue of human' feet when the bicycle is drivingly started or when it is driven over bridges and slightly upward roads for a long time by lengthening a drive telescopic crank forward, and shortening it afterward with a drive shaft made to be a starting point by means of an eccentric introduction plate device, and also making its rotating diameter identical to that of a former one. CONSTITUTION:A eccentric hole is made to coincide with the bearing part of a bicycle drive shaft 2 with both the center line of an eccentric introduction plate 5 and the center line of the eccentric hole 6 positioned in level, so as to be fitted thereon with fittings as required, so that a telescopic crank is mounted onto the drive shaft 2 with the roller 13 part of its introduction rod 11 made to coincide with an introduction groove 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bicycle drive telescopic crank and an eccentric guide plate device for eccentrically rotating the crank.

[0002]

BACKGROUND OF THE INVENTION Conventional drive crank lengths match the reciprocating rotational diameter of a petal to the range of motion of the human foot in front, behind, above, and below.

[0003]

In the conventional bicycle drive, the length of the drive crank is adjusted so that the rotation diameter of the petal matches the range of motion of a person's foot. The drive crank is lengthened to increase the petal and the drive shaft. If the interval is lengthened, the bicycle can be driven easily, but on the contrary, the rotating diameter becomes large, so there is a problem that the foot gets tired quickly. The drive telescopic crank of the present invention is designed to have an eccentric induction device and extend long in the front direction starting from the drive shaft, and shorten in the rear direction so that the rotation diameter is the same as the conventional one.

[0004]

In order to achieve the above object, the center line of the eccentric guide plate and the center line of the eccentric hole of the present invention are set in a horizontal position, and the eccentric hole is aligned with the bearing portion of the bicycle drive shaft.
Attach with metal fittings at any time.

Next, the crank body and the front crank are connected to each other by an induction lot and a connecting pin, and an integral telescopic crank is formed by aligning the roller portion of the induction lot with the induction groove of the eccentric induction plate. It is attached to the drive shaft and driven by this structure.

[0006]

When the drive telescopic crank configured as described above is driven, the roller of the induction lot is guided to the guide groove of the eccentric guide plate, and the petal rotates with the same diameter as the conventional one and draws the same circle as the guide groove.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment will be described with reference to the drawings. In FIGS. 1 and 2, an eccentric guide plate 5 is attached to an eccentric hole 6 provided in the eccentric guide plate 5 and a bearing portion of a bicycle drive shaft. Attach and fix. Next, in the embodiment shown in FIGS. 1 and 2, the crank body 9 and the front crank 10 are
Induction lot 11 and lot 15 equipped with rollers 13
Also, the drive expansion / contraction crank 8 connected so as to be smoothly expanded / contracted by the connecting pin 14 is attached to the bicycle drive shaft 2.

[0008]

Since the present invention is configured as described above, it has the following effects.

The time when the drive telescopic crank rotates from the position shown in FIG. 3 to the position shown in FIG. 1 is the time when the driving force is most necessary for the foot.

When this most driving force is required, the guide lot rotates forward along the guide groove. As a result, the petal mounted on the front crank extends longer than the conventional drive crank by the amount of eccentricity of the eccentric hole and the guide groove.

Next, the drive telescopic crank is shown in FIGS.
4 to 5, the same circle as the eccentric guide groove is drawn to rotate, and at the position shown in FIG. 5, the petal shown in FIG. 1 is shortened by the amount of the extension.

Therefore, the drive telescopic crank rotates long in the front and short in the rear while drawing the same straight circle as the conventional one.

When driven by this rotary drive, not only at the time of starting, but also on a small slope such as a bridge, it is possible to easily travel, and even if a long glue is used, tiredness of the legs is small.

[Brief description of drawings]

FIG. 1 is a front view of a position where an eccentric guide plate and a drive telescopic crank are attached to a bicycle.

FIG. 2 is a side view of a position where an eccentric guide plate and a drive telescopic crank are attached to a bicycle.

FIG. 3 is a front view when an eccentric guide plate and a drive telescopic crank are directed upward.

FIG. 4 is a front view when the eccentric guide plate and the drive telescopic crank face downward.

FIG. 5 is a front view when the eccentric guide plate and the drive telescopic crank are facing rearward.

[Explanation of symbols]

 1 Bicycle 2 Drive shaft 3 Petal 4 Petal shaft 5 Eccentric guide plate 6 Eccentric hole 7 Guide groove 8 Drive telescopic crank 9 Crank body 10 Front crank 11 Guide lot 12 Roller shaft 13 Roller 14 Connecting pin 15 lot

Claims (2)

[Claims] 1. A crank body (9) and a front crank (1)
0) is a drive telescopic crank (8) which is integrated by connecting the induction lot (11) and the lot (15). 2. An eccentric guide plate (5) provided with an eccentric hole (6) and a guide groove (7) of a device for extending and retracting a drive telescopic crank (8).