Door closer

Details Door closer Door closer

1977-02-07

1978-07-25

Feldbaum, Ronald

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

Checks and closers

16 82, E05F 300

Patent

active

041020049

ABSTRACT:
A device for controlling the opening or closing speed of a door includes a piston-piston rod assembly slidably fitted in the inner tube of a dual tube hydraulic cylinder. Oil is enclosed in the inner tube and in a portion of the outer tube, and a high pressure gas is enclosed in the outer tube for affording a force on the assembly to project the piston rod outwardly of the cylinder. A mechanism controls oil flow in the cylinder when the piston moves in one direction in the cylinder. A device converts the reciprocal movement of the piston rod into opening-closing movement of the door.

REFERENCES:
patent: 2881467 (1959-04-01), Struhar
patent: 3042957 (1962-07-01), Mussel et al.
patent: 3156002 (1964-11-01), Schmid

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