Patent ID: 6619435
Filing Date: 2003-09-16
Classification: B66B,Y10T

Abstract:
A device for preventing uncontrolled acceleration of an elevator car of an elevator installation, comprising: pulleys; a governor rope guided over the pulleys in a direction of movement of the elevator car; a braking device; a tripper arranged to connect the braking device to the governor rope so that the braking device brakes the elevator car in both a downward and an upward direction when the governor rope transmits a specified tripping force to the tripper; an overspeed governor operatively connected one of directly to the governor rope and to at least one of the pulleys, so as to bring at least one of the pulleys, or the governor rope, to rest when a speed of travel of the elevator car exceeds a specified limit speed either in the downward direction or in the upward direction; and a slipping connection arranged to connect the braking device to the governor rope so as to limit the force transmitted to the tripper, whereby the governor rope slips on the slipping connection when a force is transmitted from the governor rope to the tripper of the braking device which is significantly greater than the tripping force needed to trip the braking device.