Patent ID: 6968754

Claim:
A right crank, comprising: a crank arm ( 1 ) being arranged with the crank head ( 2 ) such that said crank arm ( 1 ) is able to rotate along its longitudinal plane with a 180Â° rotation angle, the crank arm ( 1 ) is connected to the crank head ( 2 ) through an elastic rotation axis ( 6 ) and a lock axis ( 7 ) having a reduced diameter (D) in the middle of said lock axis ( 7 ); the crank arm ( 1 ) further comprises a lock device ( 4 ) that is connected to the push button ( 5 ) and both together are pressed to a retaining spring ( 3 ) which is inserted in the crank arm hole (H) allowing the middle part of the lock axis ( 7 ) to flush with the crank arm hole (H) and releasing the crank arm ( 1 ); and a fastening nut ( 8 ) to fix the crank head ( 2 ) to a pedal-sprocket.