Door closer

Details Door closer Door closer

1978-03-14

1980-01-01

Schroeder, Werner H.

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

Checks and closers

Liquid

16DIG9, 16DIG10, 16DIG21, E05F 322

Patent

active

041808886

ABSTRACT:
A door closer includes a horizontally disposed inner cylinder receiving oil therein, an outer cylinder surrounding the inner cylinder and receiving gas and oil in an annular spaced defined around the inner cylinder, a piston slidably fitted in the inner cylinder, a piston rod secured to the piston and extending out of the cylinders for connection to a door, a passage disposed at one end of the inner cylinder for communicating the interior of the inner cylinder with the annular space, a valve member movably mounted on the piston rod and normally at a position spaced from the piston for cooperating with the passage so as to reduce the effective passage area of the passage in the end portion of outward movement of the piston rod relative to the cylinders.

REFERENCES:
patent: 3446317 (1969-05-01), Gryglas
patent: 3487494 (1970-01-01), Baan et al.
patent: 3584331 (1971-06-01), D'Hooge
patent: 3742553 (1973-07-01), Sittmann
patent: 3822438 (1974-07-01), Takenaka
patent: 3997037 (1976-12-01), Schupner
patent: 4075734 (1978-02-01), Nagase

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