Movable or removable closures – With operator for movably mounted closure – Coaxial of closure pivot
Patent
1994-02-23
1995-05-23
Kannan, Philip C.
Movable or removable closures
With operator for movably mounted closure
Coaxial of closure pivot
49 28, E05F 1502
Patent
active
054170117
ABSTRACT:
A swinging door operating mechanism includes a hydraulic cylinder having a piston coupled to the door to open the door with the piston advance, opposite ends of the cylinder being connected through a solenoid actuated four way reversing valve to the input and output respectively of an electric motor driven hydraulic pump. A pressure responsive switch is exposed to the hydraulic fluid delivered to the door opening end of the cylinder and is actuated when the pressure exceeds an adjustable value to deenergize the pump motor and switch the advancing end of the cylinder to the pump inlet. The door opening cycle is initiated by the momentary local or remote closing of a start switch. The cylinder piston is connected to the door by a one way advancing linear to rotary motion coupling.
REFERENCES:
patent: 3195879 (1965-07-01), Bond et al.
patent: 3276164 (1966-10-01), Hilfing et al.
patent: 3864875 (1975-02-01), Hewitt
patent: 3916567 (1975-11-01), Daugirdas
patent: 3940887 (1976-03-01), Slaybaugh
patent: 4523513 (1985-06-01), Gudat et al.
Kannan Philip C.
Miskin Howard C.
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