Importance

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Abstract

A door closer having a housing defining a fluid containing chamber and a fluid reservoir and including a piston supported in the chamber for movement in one and an opposite direction in response to respective opening and closing movements of a door. A first fluid passageway defined by the housing provides communication between the chamber and the reservoir for the free passage of fluid from the chamber to the reservoir in response to initial movement of the piston in the one direction. A second fluid passageway spaced in the one direction from the first fluid passageway contains a ball check valve spring biased to closed position for resisting the flow of fluid from the chamber through the second passageway to the reservoir. The valve is threadably adjustable relative to the housing to regulate the resistance to fluid flow. A third fluid passageway spaced from the first passageway and disposed in bypassing relation to the second fluid passageway includes an adjustable metering orifice and provides a free flow path from the chamber to the reservoir. The size of the metering orifice is also adjusted by threadably adjusting the valve relative to the housing.

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First Claim