US Patent 10259526 Assembling structure for crank and pedal

The invention includes a crank, a pedal and a fastener. The crank has a flower-shaped keyed hole at an outboard end thereof. The pedal has a body and a spindle with a connecting end. The connecting end is formed with flower-shaped keys corresponding to the flower-shaped keyed hole so that the connecting end is inserted into the flower-shaped keyed hole with engagement between the flower-shaped keyed hole and the flower-shaped keys. An end surface of the connecting end is formed with a first threaded hole. The fastener passes through the flower-shaped keyed hole and screws into the first threaded hole for fixing the connecting end of the spindle to the crank.