# US 4,398,434 A · Force-saving high speed pedal

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- Number: US 4,398,434 A
- Document ID: US4398434A
- Status: Granted
- Kind: A
- Application number: 06/357,666
- Filed: 1982-03-12
- Granted: 1983-08-16
- Earliest claimed: 1980-03-12
- Inventors: Senkichiro Kimura
- Web page: https://patentgrep.com/patent/US4398434A

## CPC

- B62M 3/08: Pedals
- Y10T 74/2168: Pedals
- B62M: RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES; POWERED PROPULSION OF SLEDGES OR {SINGLE-TRACK} CYCLES; TRANSMISSIONS SPECIALLY ADAPTED FOR SUCH VEHICLES (arrangements or mounting of transmissions in vehicles in general B60K; transmission elements per se F16)
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

The fundamental principle of this invention is based on the fact that the moment of force or torque is equal to the product of a force and a distance through which the force acts from the fulcrum. The pedal of a bicycle comprises a pair of freely rotatable treads together with a pair of inner and outer plates around a spindle connected to a crank, the spindle, a center tube covering the spindle, and minor parts. The force of man's leg onto the pedal per unit time can be conserved or increased by securing one of the rotatable treads to the spindle by means of a one-way clutch means provided in the space between center tube and spindle in order to enlarge the distance from the fulcrum to the point of action of the force.

## Claims

### Claim 1

A bicycle pedal of high mechanical advantage comprising a spindle adapted to be connected to a crank, a center tube covering said spindle, inner and outer plates attached to said center tube perpendicularly thereto and inner and outer treads connecting the plates at their outer edges, said treads being parallel to said spindle, said spindle having at least one bearing race, said center tube having a plurality of arcuate grooves on the inner surface thereof, said grooves being in a single plane between said inner and outer plates and said plane being perpendicular to the axis of said center tube, each of said grooves having a ball bearing therein, the depth of the arc of said grooves becoming gradually smaller and narrower than the size of said ball bearing in the clockwise direction from one end of said groove to the other and thereof to form a one-way clutch by said bearings being wedged between said spindle and said arcuate grooves, whereby said pedal is prevented from rotation in the clockwise direction and is freely rotatable in the counter-clockwise direction.

### Claim 2 (depends on 1)

The pedal according to claim 1 wherein said one-way clutch is adjacent said inner plate.

### Claim 3 (depends on 1, 2)

The pedal according to claim 1 or 2 wherein the outer tread is further from the spindle than the inner tread to increase the distance from the fulcrum of said pedal to the point of action of the force applied to said pedal.