The bicycle gear crank arresting device comprises an axle, a first arresting member and a second arresting member. The axle is fastened pivotally with the five-way tube of a bicycle frame and is provided with a rotary rod. The first arresting member comprises a crank portion having an arcuate section...http://www.google.com/patents/US5782713?utm_source=gb-gplus-sharePatent US5782713 - Bicycle gear crank arresting device
