Two speed hydraulic door operator

Details Two speed hydraulic door operator Two speed hydraulic door operator

1993-11-12

1995-05-02

Kannan, Philip C.

Movable or removable closures

With operator for movably mounted closure

Operator drives closure along guide

60494, E05F 1502

Patent

active

054108420

ABSTRACT:
A hydraulic door operator includes a reversible hydraulic pump driven by an electric motor and connected in a closed loop to a reversible hydraulic motor which operates the door. A bypass valve assembly is connected across the loop between the pump and hydraulic motor. The bypass valve assembly is operative when fluid is delivered by the pump to drive the motor in one direction so that a portion of the fluid flow is bypassed from reaching the motor. When the pump is operated to deliver fluid to drive the motor in the opposite direction, the bypass valve assembly is inoperative. When operative, the bypass assembly will cause the motor to be driven at a slower speed than it will be driven when the bypass valve assembly is inoperative.

REFERENCES:
patent: 3126706 (1964-03-01), Dettinger
patent: 3210065 (1965-10-01), Linder et al.
patent: 3864911 (1975-02-01), Gellantly et al.
patent: 3877347 (1975-04-01), Sheesley et al.
patent: 4194365 (1980-03-01), Stoufflet et al.
patent: 4296570 (1981-10-01), Balbach et al.
patent: 4476678 (1984-10-01), Hall
patent: 4494376 (1985-01-01), Beaufort
patent: 4782662 (1988-11-01), Reeves et al.
patent: 5293747 (1994-03-01), Geiger
Aluma Shield Industries, Inc. Drawing Dated Dec. 3, 1992 and entitled "Dual Speed Hydraulic Operator".

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