Elevator door interlock

Details Elevator door interlock Elevator door interlock

1997-05-16

1999-05-04

Noland, Kenneth

Elevator, industrial lift truck, or stationary lift for vehicle

With barrier for regulating access to load support

Operation variable for emergency, maintenance, or abnormal...

187335, B66B 1314

Patent

active

058993029

ABSTRACT:
An elevator door interlock includes a position indicator mounted at each landing, an elongate vane pivotally mounted in a fixed position with respect to the car door for movement between a first position, preferably several degrees rotated from perpendicular, and a second position, preferably generally perpendicular to the door surface, a swing latch including a latch arm secured at one end to the vane, preferably extending generally perpendicular to the vane, a contact plate secured to the end of the swing latch opposite the vane end, and a stop plate mounted in a fixed position with respect to the elevator car. The vane is preferably mounted on a spring-biased hinge, and is normally biased towards the first position such that the contact plate extends into the plane of the stop plate and contacts the stop plate to prevent further opening of the elevator door more than a limited distance when the door is opened unless the elevator car door is moved into a safe landing position within the hoistway.

REFERENCES:
patent: 3912049 (1975-10-01), Holland et al.
patent: 4313525 (1982-02-01), McDonald
patent: 4423799 (1984-01-01), Glaser et al.
patent: 5377785 (1995-01-01), Pearson

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