Crank arm quick release device for bicycle, includes crank arm with locking recesses distributed in crank arm mounting hole for locking respective locking flange of fixing threaded sleeve by sleeve rotation

摘要

The wall portion of the mounting hole (21) of a crank arm (20) has two insertion guide grooves that receive two locking flanges (12) of the fixing threaded sleeve (10) for the pedal (30). Each groove has a locking recess (23) for locking a respective locking flange of the sleeve through sleeve rotation. The locking recess of each guide groove is distributed on a diameter of the mounting hole.