L-shaped monoblock crank for bicycle, has rotating sleeve for coupling crank with bottom bracket shaft of bicycle, where crank and its assembling head are fabricated in monoblock composite material

摘要

The crank (14) has an end provided with an assembling head (142), where the crank and the assembling head are fabricated in a monoblock composite material. A rotating sleeve (16) couples the crank with a bottom bracket shaft of a bicycle. The assembling head of the crank is a polygonal structure, and is assembled to a polygonal hole of the sleeve. The sleeve has a rounded flush mounted assembling element (162) coupled to the bracket shaft of the bicycle.