Door closer

Details Door closer Door closer

2005-05-03

2005-05-03

Barrett, Suzanne Dino (Department: 3676)

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

Checks and closers

Pneumatic

C016S054000, C016S056000, C016S061000, C016S059000

Reexamination Certificate

active

06886217

ABSTRACT:
A door closer having a pair of main driving springs, a fluid-filled damper arrangement and a pair of thrust springs is provided, the thrust springs coming into effect during the latter part of a door closing operation, so as to provide an augmented closing force at that point. The position at which the augmented closing force is applied is variable, with a cam mechanism being used to control application of the increased closing force.

REFERENCES:
patent: 1334982 (1920-03-01), Arnold
patent: 3887961 (1975-06-01), Saajos
patent: 4317254 (1982-03-01), Chaddock
patent: 5016317 (1991-05-01), Hung
patent: 5706551 (1998-01-01), Jeynes et al.
patent: 6625847 (2003-09-01), Jones
patent: 0052291 (2000-09-01), None

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