Adjustable power closure

Details Adjustable power closure Adjustable power closure

1996-01-31

1997-09-16

Mah, Chuck Y.

Miscellaneous hardware (e.g., bushing, carpet fastener, caster,

Closers

Spring and lever

16 51, 16 53, 16 65, 16 71, E05F 108

Patent

active

056666926

ABSTRACT:
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.

REFERENCES:
patent: 2700175 (1955-01-01), Carlson
patent: 2962749 (1960-12-01), Sasse
patent: 3124848 (1964-03-01), Wheeler et al.
patent: 3127160 (1964-03-01), Wallmann
patent: 3137888 (1964-06-01), Blom
patent: 3246362 (1966-04-01), Jackson
patent: 3724023 (1973-04-01), Tillmann
patent: 3742553 (1973-07-01), Sittmann
patent: 3947918 (1976-04-01), Favre
patent: 4064589 (1977-12-01), Bejarano et al.
patent: 4763384 (1988-08-01), Watabe
patent: 4783882 (1988-11-01), Frolov
patent: 4785493 (1988-11-01), Tillmann et al.

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