Elevator system

Details Elevator system Elevator system

1977-04-08

1978-08-15

Schaefer, Robert K.

Elevator, industrial lift truck, or stationary lift for vehicle

Stationary lift for roadway vehicle or required component...

Having specific drive means for support

B66B 1324

Patent

active

041065948

ABSTRACT:
An elevator system including apparatus for detecting mechanical damage to the elevator system, such as might be caused by an earthquake. A cable strung in the hoistway is reeved about a plurality of sheaves carried by the counterweight. Normal operation of the counterweight maintains a predetermined tension in the cable, which predetermined tension is used to maintain a switch in a first condition. Abnormal movement of the counterweight outside of its vertical travel path changes the tension in the cable and operates the switch to a second condition which modifies the operation of the elevator system.

REFERENCES:
patent: 3783978 (1974-01-01), Hamilton
patent: 3791490 (1974-02-01), Smith
patent: 4011928 (1977-03-01), Spear et al.
patent: 4056169 (1977-11-01), Showalter
patent: 4069898 (1978-01-01), Tosato et al.

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