Door closer

Details Door closer Door closer

1978-11-08

1981-04-28

Reynolds, Wm. Carter

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

Thermally released check or closer

16 52, 16 62, E05F 1520, E05F 304, E05F 310

Patent

active

042636949

ABSTRACT:
A hydraulically controlled door closer in which a spring cooperating with a piston reciprocatable in a fluid filled bore urges a closer shaft operatively connected to the piston to a position in which a door connected to the closer shaft is closer. The spring is tensioned during turning of the closer shaft in a door opening direction and may be releasably held in the tensioned condition by an additional piston located between one end of the spring and the first-mentioned piston and provided with a first passage therethrough in which a one-way valve is located in a second passage which may be closed and opened by an electromagnetically operated valve.

REFERENCES:
patent: 3852846 (1974-12-01), Slaybaugh
patent: 4050114 (1977-09-01), Zunkel
patent: 4067084 (1978-01-01), Tillman
patent: 4115897 (1978-09-01), Zunkel

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