B - Operations – Transporting – 66 – B
Patent
B - Operations, Transporting
66
B
B66B 1/30 (2006.01) B66B 5/02 (2006.01) B66B 11/02 (2006.01) B66B 11/04 (2006.01)
Patent
CA 2540755
The present invention provides an elevator comprising a car (1) arranged to travel along guide rails (6) within a hoistway (8) and a main drive (52,54,56,DMC) to propel the car (1). A sensor (30;40) is mounted on the car (1) to measure a vertical travel parameter (Vc;Ac) of the car (1), a comparator (32) compares the sensed car travel parameter (Vc;Ac) with a reference value (Vr;Ar) derived from the main drive (52,54,56,DMC), and an auxiliary motor (24) is mounted on the car (1) to exert a vertical force (F) on at least one of the guide rails (6) in response to an error signal (Ve;Ae) output from the comparator (32).
Ag Inventio
Riches Mckenzie & Herbert Llp
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