Modulated output force door operator

Details Modulated output force door operator Modulated output force door operator

1977-05-09

1979-01-16

Downey, Kenneth

Movable or removable closures

Optionally moved, manually, or by motor

49 26, 49363, E05F 1506

Patent

active

041342313

ABSTRACT:
A pneumatic powered door operator including a pneumatic differential engine with an output shaft having a slide bar applying driving action through a roller to a multiplying lever wherein the multiplying lever is pivotally mounted at one end and provided with a roller at the other end and linkage means for interconnecting the multiplying lever to a slidable door. An electropneumatic control circuit controls the operation of the engine and includes a pneumatic spring arrangement which allows manual operation of the door during electrical failure with air available while being capable of maintaining the door in a closed position when not manually actuated.

REFERENCES:
patent: 965770 (1910-07-01), Voigt
patent: 3003317 (1961-10-01), Schroeder et al.
patent: 3453778 (1969-07-01), Daugirdas
patent: 3552061 (1971-01-01), Hermann
patent: 3916567 (1975-11-01), Daugirdas
patent: 3938282 (1976-02-01), Goyal

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