Optical control system for elevators

Details Optical control system for elevators Optical control system for elevators

1975-12-29

1977-07-05

Schaefer, Robert K.

Electricity: motive power systems

Automatic and/or with time-delay means

Speed or rate-of-movement

318480, 318484, 187 29R, H02H 7093

Patent

active

040342751

ABSTRACT:
A reduction in speed of a movable member is sensed by an R. C. time delay circuit including light activated silicon controlled rectifiers which are respectively activated by light beams sequentially applied thereto at the rate of movement of said movable member.

REFERENCES:
patent: 2996630 (1961-08-01), Bensema et al.
patent: 3389321 (1968-06-01), Miller et al.
patent: 3617815 (1971-11-01), Foldvari et al.
patent: 3801890 (1974-04-01), Ichiyanagi
patent: 3845375 (1974-10-01), Stiebel

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