Braking apparatus for door closer

Details Braking apparatus for door closer Braking apparatus for door closer

1987-11-10

1989-05-02

Seidel, Richard K.

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

Checks and closers

Liquid

16 76, 16 82, 188306, 188310, 267217, E05F 306

Patent

active

048255033

ABSTRACT:
An improved door closer which prevents overly rapid closing due to an external force, such as wind pressure, being exerted on the door. A pair of oil holes are formed communicating with a first pressure chamber and a non-pressure chamber formed in the main cylinder of the closer. A slide valve is disposed in a communicating hole communicating with the oil holes and extending generally perpendicular to the cylinder. A head portion and a braking valve portion are formed on the valve rod of the slide valve at positions corresponding to the oil holes. An elastic member urges the slide valve in the direction opposite to the normal flow direction of the operating oil when the door is closing. An adjusting screw controls the position of the slide valve.

REFERENCES:
patent: 3446317 (1969-05-01), Cryglas
patent: 4325164 (1982-04-01), Sasaki
patent: 4423800 (1984-01-01), Kobiske et al.

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