Restraining elevator car motion while the doors are open

Details Restraining elevator car motion while the doors are open Restraining elevator car motion while the doors are open

1991-04-09

1994-06-14

Stephan, Steven L.

Elevator, industrial lift truck, or stationary lift for vehicle

Stationary lift for roadway vehicle or required component...

Having specific drive means for support

187 38, 187104, B66B 500

Patent

active

053212169

ABSTRACT:
The invention is directed to a safety circuit which detects when the car is at least a predetermined distance away from a floor landing while a car door is open. The safety circuit, upon detection of this condition, activates a solenoid located on a safety governor of the elevator car and/or the counterweight, causing safeties to engage, precluding further motion of the car and/or counterweight. The safety circuit comprises the solenoid and a relay having a contact and a coil. Given means for energizing the coil when the elevator car drifts beyond a predetermined distance with a door open, the contact will close, providing power to the solenoid for actuation. The safety circuit preferably employs a relay which indicates whether the car door is open or closed, as well as relays which indicate whether various other system operational checks are satisfactory. To check the functionality of the components upon which the safety circuit relies, the preferred embodiment provides additional circuitry to check the functionality of the door relay and the operational check relay, as well as circuitry to check the electrical integrity of and the power connections to the solenoid. The safety circuit actuates the solenoid if a car door is open, the car is beyond the predetermined distance from the landing, and a machine tachometer indicates a non-zero velocity. The predetermined distance from the landing is preferably the outer door zone.

REFERENCES:
patent: 4308936 (1982-01-01), Caputo et al.
patent: 4538706 (1985-09-01), Koppensteiner
patent: 4556155 (1985-12-01), Koppensteiner
patent: 4785914 (1988-11-01), Blain et al.
patent: 4923055 (1990-05-01), Holland
patent: 5183978 (1993-02-01), Sheridan et al.
Janovsky "Elevator Mechanical Design Principles & Concepts", Ellis Horwood Limited, England (1987).

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