Patent ID: 7753176
Filing Date: 2010-07-13
Classification: B66B

Abstract:
1. An emergency stop system for an elevator, composing: a detection portion for detecting a speed and a position of a car; a control portion having a storage portion that stores, in correspondence with the position of the car, an overspeed setting level set to be a value larger than the speed of the car during normal operation, the control portion outputting an activation signal when the speed of the car becomes higher than the overspeed setting level at the position of the car obtained based on information from the detection portion, and the overspeed setting level progressively varies based on a distance between the position of the car and a service floor; a governor rope that moves in synchronism with raising and lowering of the car and is wound around a governor sheave, wherein the detection portion is provided to the governor sheave around which the governor rope is wound; a rope catching device having an electromagnetic actuator that is activated upon input of the activation signal, a restraining portion that restrains the governor rope upon activation of the electromagnetic actuator, and a ratchet gear rotated integrally with the governor sheave; and a braking portion mounted in the car and having a braking member capable of coming into and out of contact with a guide rail for guiding the car, the braking portion braking the car by pressing the braking member against the guide rail when the governor rope is restrained and the car is displaced with respect to the governor rope, wherein the restraining portion is a pressing member capable of displacement into and out of contact with the governor sheave, and the pressing member is pressed against the governor sheave through the governor rope upon activation of the electromagnetic actuator.