Lift control system

Details Lift control system Lift control system

1981-12-15

1985-05-28

Trafton, David L.

Communications: electrical

Selective

Interrogation response

187 29R, 187 52R, 250221, 250237R, 340555, B66B 300

Patent

active

045203431

ABSTRACT:
A lift control system includes a spatial filter producing a signal having various features, a discriminator for discriminating one or more features of the signal, and for producing a control signal when at least one of the features discriminated falls in a predetermined range, and active devices connected to the discriminator. The active devices are made active upon receipt of the control signal.

REFERENCES:
patent: 2198725 (1940-04-01), Smith
patent: 3168164 (1965-02-01), Kiely
patent: 3444544 (1969-05-01), Pearson et al.
patent: 3803572 (1974-04-01), Campman
patent: 3824392 (1974-07-01), Tibbling
patent: 3972021 (1976-07-01), Leitz et al.
patent: 4052616 (1977-10-01), Keller
patent: 4258255 (1981-03-01), Guscott

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