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A door closer having a spindle and cam arrangement for driving a cam plate longitudinally within a housing filled with oil, and dual rods connected to the cam plate at one end and to two pistons respectively at an opposite end. The pistons are reciprocal within cylinders having speed valves in flow

A door closer having a spindle and cam arrangement for driving a cam plate longitudinally within a housing filled with oil, and dual rods connected to the cam plate at one end and to two pistons respectively at an opposite end. The pistons are reciprocal within cylinders having speed valves in flow communication to opposite sides of the pistons. Dual springs are arranged, one around each rod and compressed between the pistons and a fixed compression plate within the housing. A single adjusting screw extends from a front end of the housing to a threaded central aperture of the compression plate. Rotation of the adjusting screw sets the initial spring compression force of the return springs which influences the rate of closure of the door and the preload force of the door to the door frame.

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A door closer comprising: a housing having an enclosed interior for holding hydraulic oil; a spindle extending from said housing; a driven means for reciprocating within said housing; a rotation means connected to said spindle for reciprocating said driven means upon rotation of said spindle; first

A door closer comprising: a housing having an enclosed interior for holding hydraulic oil; a spindle extending from said housing; a driven means for reciprocating within said housing; a rotation means connected to said spindle for reciprocating said driven means upon rotation of said spindle; first and second pistons; cylinders formed in said housing for holding said first and second pistons; a first rod and a second rod connected to said first and second pistons respectively and extending out from said cylinders, said first and second rods connected to said driven means; a compression plate arranged between said pistons and said driven means; first and second springs surrounding said first and second rods respectively and arranged between said compression plate and said pistons; and an adjusting screw arranged parallel to and between said first and second rods and engaged to said compression plate and having a tool engageable formation accessible from an outside of said housing, rotation of said adjusting screw positioning said compression plate to add compression or relieve compression of said first and second springs.