Automatic door operator

Details Automatic door operator Automatic door operator

1981-01-30

1983-10-04

Weldon, Ulysses

Electricity: motive power systems

Plural diverse motor controls

Motor-reversing

318265, 318466, 318469, H02P 122

Patent

active

044081464

ABSTRACT:
An automatic door operator system is provided with a first potentiometer having its wiper arm coupled to a pivoting member whose angular position varies in accordance with the magnitude and direction of an obstructive load applied to the door. A second potentiometer is provided having its wiper arm coupled to a movable member whose position corresponds to the position of the door. The potentiometers are connected as voltage dividers and the voltages provided at their wiper arms are utilized for controlling the movement of the door.

REFERENCES:
patent: 638150 (1899-11-01), Sautter
patent: 2661450 (1953-12-01), Moler
patent: 3254289 (1966-05-01), Hartman
patent: 3403310 (1968-09-01), Davidoff
patent: 3470431 (1969-09-01), Jones
patent: 3474317 (1969-10-01), Delaney
patent: 3539894 (1970-11-01), Feldman
patent: 3719005 (1973-03-01), Carli
patent: 3764874 (1973-10-01), Geoffrey
patent: 3813590 (1974-05-01), Ellmore
patent: 3851125 (1974-11-01), Deming et al.
patent: 4338553 (1982-07-01), Scott, Jr.

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