Elevator – industrial lift truck – or stationary lift for vehicle – Stationary lift for roadway vehicle or required component... – Having specific drive means for support
Patent
1986-05-19
1987-06-09
Shoop, Jr., William M.
Elevator, industrial lift truck, or stationary lift for vehicle
Stationary lift for roadway vehicle or required component...
Having specific drive means for support
B66B 302
Patent
active
046713913
ABSTRACT:
A moving distance detector for an elevator including an encoder pulse receiver having a differential amplifier for receiving input signal pulses generated upon movement of an elevator cage and transmitted on first and second signal transmission lines. Resistors are respectively connected between the first signal transmission line and a first input terminal of the differential amplifier and between the second signal transmission line and a second input terminal thereof to provide a difference between the low and high voltage signals at the first and second input terminals of the differential amplifier. Since the biasing voltage of a signal provided at one of the input terminals of the differential amplifier when the corresponding transmission line is interrupted is set to be sufficiently different from the high or low voltage level of the signal at the other input terminal, an output representing a fault or unstable state in the balancing transmission lines is readily produced. The elevator is prevented from being erroneously controlled to improve the accuracy of the moving distance detector.
REFERENCES:
patent: 4218671 (1980-08-01), Lewis
patent: 4341287 (1982-07-01), Kuzunuki et al.
patent: 4518062 (1985-05-01), Makinen et al.
patent: 4624005 (1986-11-01), Tachino
"Parallel Type Transmission Circuit:, Transistor Technique Review, pp. 220-221, Jun. 1979.
"Interphase IC-Operation and Application for Line Driver and Receiver" Texas Instruments, Jan. 1983.
Duncanson Jr. W. E.
Mitsubishi Denki & Kabushiki Kaisha
Shoop Jr. William M.
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