This product was designed to be double electric and single machine controlled. The steel rope of overspeed governor is to be grasped by the pinch block, and to pull the safety clamp, to force the elevator car stop. Such design abandoned the traditional sheave braking model, to avoid abrasion of sheave caused by braking the steel rope. Brake shoe is made of special material to reduce replacement times after braking, which will help enterprises in cost saving.