Patent ID: 7607515
Filing Date: 2009-10-27
Classification: B66B

Abstract:
1. An emergency evacuation apparatus for an elevator which has a car with a window, a counterweight, hoist ropes having one end connected to the car and the other end connected to the counterweight, a drive sheave, a brake, and a motor, the evacuation apparatus comprising: a brake operating device connected to the brake; a distal emergency pulley with a grooved rim, mounted on a first shaft which has a fixed axis of rotation, separate from the drive sheave; an intermittent brake release mechanism further comprising an auxiliary drive, further comprising an emergency cable running through the grooved rim of the emergency pulley, passed down, and disposed externally of the window, causing the emergency pulley to turn when the cable is pulled; wherein in response to a stop of the elevator in case of emergency, when the brake actuates to stop a rotation of the drive sheave, a person trapped in the car is able to reach his or her hand out of the window to pull down the emergency cable to turn the emergency pulley which turns the first cam and the second cam respectively; the continuous turning of the first cam intermittently releases and actuates the brake by causing the first cam to act on the brake operating device; and the releasing of the brake allows the second cam to turn the drive sheave to incrementally lower the car to a correct floor.