Apparatus and method for increasing the efficiency of a door clo

Details Apparatus and method for increasing the efficiency of a door clo Apparatus and method for increasing the efficiency of a door clo

1991-12-13

1993-05-04

Bray, W. Donald

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

Checks and closers

Liquid

16 58, 16 79, E05F 304, E05F 322

Patent

active

052069710

ABSTRACT:
A door closer has a fluid conduit connecting the high pressure portion of the cylinder in front of the piston with a cavity between the surfaces of the cylinder wall and the piston. This cavity is located at the intermediate lateral surface of the piston at the back side of a gear rack formed on the piston. The variable lateral bias provided by the pressurized cavity counteracts separating forces between the gear rack and a gear pinion caused by the tapered teeth. This decreases friction between the piston and the cylinder and reduces wear throughout the closer mechanism.

REFERENCES:
patent: 4763385 (1988-08-01), Furch et al.
patent: 4999872 (1991-03-01), Jentsch

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