Elevator system

Details Elevator system Elevator system

B - Operations, Transporting

66

B

187/13, 364/23

B66B 5/02 (2006.01)

Patent

CA 1067838

ELEVATOR SYSTEM ABSTRACT OF THE DISCLOSURE An elevator system including apparatus for detect- ing 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 coun- terweight. 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 verti- cal travel path changes the tension in the cable and oper- ates the switch to a second condition which modifies the operation of the elevator system.

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