Elevator system

Details Elevator system Elevator system

1983-10-21

1985-07-16

Rolla, Joseph J.

Elevator, industrial lift truck, or stationary lift for vehicle

Stationary lift for roadway vehicle or required component...

Having specific drive means for support

187 61, B66B 1316

Patent

active

045290652

ABSTRACT:
An elevator system including an elevator car having an electromechanical door restraint mechanism which includes a locked position which permits slight opening of the door by passengers for ventilation purposes, while preventing the forcible opening of the elevator car door beyond that point when the elevator car stops outside a predetermined allowable displacement zone adjacent to a floor level. Power supply failure deenergizes a first solenoid of the mechanism which causes the door restraint mechanism to assume its locked position. A capacitor, charged by the power supply before failure thereof, energizes a second solenoid to unlock the door when the elevator car is within an allowable displacement zone, and the closed door is moved slightly by a passenger towards its open position. Continued movement of the car door, beyond the predetermined point, returns the mechanism to the locked position, which now prevents complete closure of the car door.

REFERENCES:
patent: 3878919 (1975-04-01), Dewhurst
patent: 4313525 (1982-02-01), McDonald
patent: 4357998 (1982-11-01), Gibson et al.
patent: 4364454 (1982-12-01), Glaser et al.
patent: 4436184 (1984-03-01), Dorman et al.

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