E - Fixed Constructions – 02 – F
Patent
E - Fixed Constructions
02
F
268/40
E02F 3/04 (2006.01) E05F 3/10 (2006.01) E05F 3/22 (2006.01)
Patent
CA 1112256
76-LHD-360 TITLE: ZERO FORCE HOLD OPEN DOOR CLOSER INVENTOR: RICHARD L. ZUNKEL A B S T R A C T A door closer for moving a door connected thereto from an open position to a closed position includes a housing, a chamber located within the housing, a piston movable in the chamber in response to movement of the door and a linkage assembly connected to the door for transmitting door movement from the door to the piston. A fluid chamber is disposed on one side of the piston and the piston moves through the fluid chamber upon closing movement of the door. Valve means is provided for controlling the rate of fluid flow from the fluid chamber as the piston moves therethrough to thereby control the rate of movement of the piston and the damping force acting on the door. A spring is disposed in the chamber and acts on the piston to provide a force to move the door toward the closed position. Means are provided for rendering the spring ineffective to bias the piston to move the door toward its closed position while allowing the door to close under a manual force exerted thereon while the closing rate of the door is controlled by the valve means controlling the rate of fluid flow therethrough from the fluid chamber. Such a construction allows the door to be under full control of a hydraulic fluid control system when the closing force exerted by the spring means is rendered ineffective.
312956
Macrae & Co.
Scovill Inc.
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