Patent ID: 7392885

Claim:
An emergency escape apparatus for an elevator including a main motor, a drive sheave, a plurality of hoist ropes rotatably put on the drive sheave, a brake, a counterweight, and a car, comprising: a gear mounted on a front end of the drive sheave; a bar member operatively connected to the brake; an actuation rope having one end terminated at a wall of the car; an electromagnetic actuator mounted on the actuation rope; a pivot bar having one end connected to the other end of the actuation rope; a front cam adjacent the pivot bar; a rear cam adjacent the bar member; a switch adjacent the rear cam; a first shaft connected through the pivot bar and the front and rear cams; a curved front actuation member mounted below the front cam; a curved rear actuation member mounted below the rear cam; a backup power supply; a backup motor mounted in front of the front actuation member and operatively connected thereto; a pinion in a rear of the front actuation member; a plurality of pressing rollers mounted above the hoist ropes; and a second shaft rotatably connecting the actuation members, the pinion, and the pressing rollers together; whereby in response to power outage manually pulling the actuation rope will pivot the pivot bar counterclockwise to rotate the front and rear cams, press the front and rear cams onto the front and rear actuation members respectively, lower the pinion to be in mesh with the gear, press the pressing rollers onto the hoist ropes, activate the bar member to deactivate the brake, close the switch, and activate the backup motor to turn the pinion and the drive sheave through the gear, thereby lowering the car until a predetermined floor is reached; and whereby speeding the car will automatically enable the electromagnetic actuator to pull the actuation rope, pivot the pivot bar counterclockwise to rotate the front and rear cams, press the front and rear cams onto the front and rear actuation members respectively, lower the pinion to be in mesh with the gear, press the pressing rollers onto the hoist ropes, activate the bar member to deactivate the brake, close the switch, and activate the main motor to lower the car until a predetermined floor is reached.