Elevator system

Details Elevator system Elevator system

1985-05-02

1987-02-17

Duncanson, Jr., W. E.

Elevator, industrial lift truck, or stationary lift for vehicle

Stationary lift for roadway vehicle or required component...

Having specific drive means for support

B66B 502

Patent

active

046432760

ABSTRACT:
A traction elevator system having an elevator car and a counterweight. Counterweight derailment, such as due to an earthquake, is detected via a vertically oriented wire strung tautly in the hoistway, a metallic ring on the counterweight which encircles the wire, control connected to the wire for detecting contact between the ring and wire, and a switch on the counterweight which enables the control to detect contact between the ring and wire only after predetermined abnormal horizontal movement of the counterweight.

REFERENCES:
patent: 4056169 (1977-11-01), Showalter

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