JP2000335472A - Power-saving bicycle using lever crank - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase the respective leg forces applied to a right and a left pedal by crank by utilizing the principle of the lever and move a pedal bicycle with saved power. SOLUTION: A right and a left crank 3, 4 have the respective vicinities of the roots bent in the reverse direction of the forward rotating direction of a bicycle to be fitted to a shaft 5, and both right and left pedals 1, 2 are fitted thereto. Bending angle of both the cranks 3, 4 is such that the leg force is gradually increased from one degree and becomes maximum at 90 degrees. When the bending angle of both the cranks 3, 4 and the ratio of lengh of two sides agree with each other, the respective leg forces applied to both the pedals 1, 2 are increased by about 20%. Accordingly, a bicycle can be moved with saved power. In the case of a motor-driven auxiliary-powered bicycle, the charged power of a battery can be reduced. Besides, the structure is so simple that trouble can be reduced and the manufacturing cost can be lowered.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power-saving bicycle using a lever crank.

[0002]

2. Description of the Related Art A conventional bicycle is a crank having a rod-like rotation direction.

[0003]

These have the following disadvantages. (A) With a rod-shaped crank, the leg strength of the pedal is not increased by the crank. (B) Therefore, it is easy to get tired when traveling uphill or traveling a long distance. (C) Elderly people and women with weak legs often get tired. This has been made in order to solve the above disadvantages.

[0004]

The left crank (3) and the right crank (4) of the bicycle are bent near the base in a direction opposite to the forward rotation, and attached to the shaft (5). The leg strength of the pedal (1) and the right pedal (2) is increased by the crank, so that the rotational output of the crank is amplified and the bicycle can be moved with less labor.

[0005]

Embodiments of the present invention will be described below. (A) The left crank (3) and the right crank (4) bend near the base in the direction opposite to the forward rotation. (B) Attach the left and right cranks to the shaft (5). (C) Attach the left pedal (1) and the right pedal (2) to the left and right cranks.

[0006]

(A) The bending angle of the crank is increased from 1 degree to the maximum leg strength and 90 degrees. (B) If the ratio between the bending angle of the crank and the length of the two sides matches, the leg force of the pedal is increased by about 20% with the crank. (C) Therefore, it is not tired even when traveling uphill or traveling a long distance. (D) Elderly people and women with weak legs are less likely to get tired. (E) The electric assisted bicycle increases leg strength and reduces the charge power of the battery. (F) Since the lever crank has a simple structure, there is no failure and the manufacturing cost is low.

[Brief description of the drawings]

FIG. 1 is a plan view of the present invention.

FIG. 2 is a left side view of the present invention.

FIG. 3 is a right side view of the present invention.

[Explanation of symbols]

 1 left pedal 2 right pedal 3 left crank 4 right crank 5 axis 6 saddle

Claims (1)

[Claims] 1. A left crank (3) and a right crank (4) of a bicycle bend around the base in a direction opposite to the forward rotation,
When attached to the shaft (5), the left pedal (1)
And the power of the right pedal (2) is increased by the crank, so the rotational output of the crank is amplified and the bicycle can be moved with less labor.