B - Operations – Transporting – 66 – B
Patent
B - Operations, Transporting
66
B
364/1, 187/7
B66B 1/04 (2006.01)
Patent
CA 1277047
53,783 ABSTRACT OF THE DISCLOSURE A hydraulic elevator system for monitoring a cold oil thermostat mounted on a hydraulic oil reservoir to prewarm the oil prior to passenger service by recirculating the oil in the reservoir through a pumping path which goes past up and down valves, thus bypassing the hydrau- lic jack. A control circuit including a microprocessor generally controls all car and corridor functions and is photo-coupled to the thermostat for an input signal which interacts with a program module in a random access memory which is run in sequence by the microprocessor. The program module provides a minimum timer phase for pump motor energization which is short but normally adequate to circulate the oil to standard minimum operating temperature before the sequencing activates a maximum timer phase which is cumulative in time for continuous bypassing until shutdown. The tiered total timer counting thus prevents overtemperature problems to avoid damage to the pump motor windings if the thermostat fails and also prevents recycling.
569039
Shah Denis Dinkerray
Thomas Richard Lester
Ag Inventio
Riches Mckenzie & Herbert Llp
LandOfFree
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