Elevator – industrial lift truck – or stationary lift for vehicle – Stationary lift for roadway vehicle or required component... – Having specific drive means for support
Patent
1979-07-16
1981-05-05
Spar, Robert J.
Elevator, industrial lift truck, or stationary lift for vehicle
Stationary lift for roadway vehicle or required component...
Having specific drive means for support
180170, 180271, 318333, 318652, B66F 906, B60K 3100, G05B 106, H02P 506
Patent
active
042653371
ABSTRACT:
A speed control circuit is provided for a lift truck which is driven by an electric truck drive motor powered from a power source through a motor controller. The motor controller is responsive to a power control signal generated by summing a speed sensor signal, which is derived by comparing a tachometer signal with a speed selection signal. A fork height sensor provides a fork height signal which is used to limit the maximum level of the speed control signal. A safety circuit monitors operation of the speed control circuit and disconnects the circuit from the motor controller upon occurrence of a malfunction.
REFERENCES:
patent: 2751994 (1956-06-01), Remde
patent: 2790513 (1957-04-01), Draxler
patent: 2935161 (1960-05-01), Comfort
patent: 3489238 (1970-01-01), Kruckman
patent: 3524522 (1970-08-01), Thomas et al.
patent: 3542161 (1970-11-01), Ulinski
patent: 3633086 (1972-01-01), Speth et al.
Crown Controls Corporation
Spar Robert J.
Wacyra Edward M.
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