Industrial hydraulic door operator

Details Industrial hydraulic door operator Industrial hydraulic door operator

1988-06-17

1990-07-17

Garrett, Robert E.

Power plants

Pressure fluid source and motor

Having a mechanical clutch or brake device in the power train

60436, 60441, 60442, 60464, 74625, 74665E, 160310, 160311, 160312, 49 27, 49360, 417442, E06B 9204, E06B 9209, F16D 102

Patent

active

049413201

ABSTRACT:
A door operator having a fluid drive motor and a manual override. The bidirectional hydraulic motor connects to a drive shaft through a power train including a shiftable --quill--type manual clutch mechanism which allows an alternate connection of the drive shaft to a manually-operated wheel. When the cable which shifts the clutch for manual drive is pulled, a switch disables the control for the hydraulic motor. When the motor is not provided with pressured fluid from the pump a hydraulic brake engages the motor.

REFERENCES:
patent: 2096251 (1937-10-01), Knight et al.
patent: 2110231 (1938-03-01), McCloud
patent: 2622452 (1952-12-01), Michelman
patent: 2670065 (1954-02-01), Stevens
patent: 2758836 (1956-08-01), Purdy
patent: 3001038 (1961-09-01), Gessell
patent: 3383948 (1968-05-01), Palmer et al.
patent: 3992991 (1976-11-01), Koch
patent: 4296570 (1981-10-01), Balbach et al.
patent: 4474078 (1984-10-01), Denkowski et al.
patent: 4519487 (1985-05-01), Florin
patent: 4694607 (1987-09-01), Ishida et al.
patent: 4721146 (1988-01-01), Wardlaw

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