Variable length crank arm

Details Variable length crank arm Variable length crank arm

1995-12-01

1997-06-10

Lorence, Richard M.

Machine element or mechanism

Elements

Cranks and pedals

G05G 114

Patent

active

056365543

ABSTRACT:
A variable length crank arm assembly for transferring energy to the power train of a bicycle, the assembly including a primary crank arm attached to a secondary crank arm by a rotatable coupling. The rotatable coupling enables the secondary crank arm to be rotated to extended and retracted positions during the power and unloading strokes of a pedal cycle. The variable length crank arm is biased to impart a continuous force to rotate the secondary crank arm toward its retracted position, and a stop limits the rotation of the secondary crank arm to establish the extended and retracted positions.

REFERENCES:
patent: 563821 (1896-07-01), Unruh
patent: 597911 (1898-01-01), Morris
patent: 2316530 (1943-04-01), Nilsen

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