Elevator – industrial lift truck – or stationary lift for vehicle – Stationary lift for roadway vehicle or required component... – Having specific drive means for support
Patent
1979-12-27
1981-11-17
Moses, R. L.
Elevator, industrial lift truck, or stationary lift for vehicle
Stationary lift for roadway vehicle or required component...
Having specific drive means for support
187 31, B66B 1308
Patent
active
043006612
ABSTRACT:
An elevator system includes a microprocessor-based cab controller which controls door motion and which controls the generation of stall forces in the door. The disclosed embodiment includes a dictated velocity, high-speed door profile, and a position-controlled dictated velocity profile, door motion being controlled as the difference between actual door velocity and dictated velocity. A stall mode, in which the door motor is provided with currents required to provide a desired force on the door, is invoked with the door velocity is less than a predetermined stall velocity, provided that the door is at an extreme position of traverse, the previous cycle was a stall cycle, or a hysteresis time period has elapsed with the velocity consistently less than the stall velocity. An exemplary elevator control system and microprocessor-based cab controller, as well as an exemplary overall door control program and details of the present invention are disclosed.
REFERENCES:
patent: 2363929 (1944-11-01), Banks et al.
patent: 3376486 (1968-04-01), Caputo
patent: 4006392 (1977-02-01), Catlett et al.
patent: 4193478 (1980-03-01), Keller et al.
Duncanson Jr. W. E.
Greenstien Robert E.
Moses R. L.
Otis Elevator Company
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