Device for damping the closing movement of a dual door spring-lo

Details Device for damping the closing movement of a dual door spring-lo Device for damping the closing movement of a dual door spring-lo

1983-02-15

1990-11-06

Godici, Nicholas P.

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

Checks and closers

Liquid

16 62, 16 64, 16 84, 16DIG10, 16DIG17, 16DIG21, 16 485, 188292, 188295, E05F 312

Patent

active

049674447

ABSTRACT:
A double-winged door spring is biased for closing with a mechanism for damping of the closure movement and includes a closure sequence control, particularly of a fire-resistant door, in which the damping of the movable door portion is accomplished through a hydraulic damping element with throttled overflow. The hydraulic damping element includes two oppositely controlled pressure chambers defined by a double-acting piston and a valve disposed in the overflow conduit connecting the two pressure chambers, the valve being actuated directly or indirectly through the stationary door portion. By the valve being disposed in the overflow conduit, actuation of the movable door portion can be inhibited until the stationary door portion is closed.

REFERENCES:
patent: 1826553 (1931-10-01), Lasier
patent: 2098501 (1937-11-01), Lasier
patent: 4073033 (1978-02-01), Lexnas
patent: 4267619 (1981-05-01), Suska

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