Adjustable length crank arm for a bicycle

Details Adjustable length crank arm for a bicycle Adjustable length crank arm for a bicycle

1982-09-16

1984-05-08

Staab, Lawrence J.

Machine element or mechanism

Elements

Cranks and pedals

745944, 74600, 403 3, 403 4, 403359, G05G 114

Patent

active

044467532

ABSTRACT:
A crank for a bicycle, which mounts a pedal shaft into a through bore of each crank arm so that the angular position of the pedal shaft can be changed to change the effective length of the crank arms employs first and second adapters, each having a mounting bore for the pedal shaft which is eccentric with respect to the center of the through bore and an engaging portion engageable with one side of the crank arm, the pedal shaft screwing with at least one of the adapters, at least one of the adapters and the crank arm having therebetween an anti-rotation mechanism so that each adapter is fitted into the mounting bore in relation of being changeable in position and non-rotatable at the changed position with respect to the crank arm, the adapters being drawn toward each other to urge the engaging portions to the crank arm, thereby fixing the pedal shaft to the crank arm through each adapter.

REFERENCES:
patent: 626227 (1899-06-01), Gaylor
patent: 990594 (1911-04-01), Roach
patent: 2860015 (1958-11-01), Matterson
patent: 2948558 (1960-08-01), Schultz
patent: 4106876 (1978-08-01), Tregoning

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