Door closer piston assembly having separate head portions

Details Door closer piston assembly having separate head portions Door closer piston assembly having separate head portions

1986-04-01

1987-05-19

Silverberg, Fred

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

Checks and closers

Liquid

16 58, 16 62, 16 79, 91405, 92136, 92255, E05F 310

Patent

active

046655832

ABSTRACT:
A hydraulic door closer has a housing including a bore and a piston supported for reciprocal sliding movement within the bore in door opening and closing directions corresponding, respectively, to opening and closing movements of an associated door. The piston has a head at one end and an open opposite end which receives a portion of a spring which biases the piston in its door closing direction. First and check second check valves within the head comprise part of a fluid control system for checking movement of the piston during at least a portion of its travel in either its door opening or door closing direction.

REFERENCES:
patent: 3000043 (1961-09-01), Check
patent: 3220047 (1965-11-01), Flint
patent: 3323422 (1967-06-01), Freese
patent: 3408683 (1968-11-01), Zahn

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