Door closer delayed action speed control system

Details Door closer delayed action speed control system Door closer delayed action speed control system

1981-03-16

1983-04-05

Bell, Paul A.

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

Checks and closers

Liquid

16 49, E05F 322

Patent

active

043786120

ABSTRACT:
A delayed action door closer that delays a portion of the closing of a door for an adjustably determined period of time after the door has been moved to its fully open position. An interdependent hydraulic speed control system utilizes a delayed action speed control regulating valve which controls the closing speed of the door in the delayed action zone only, and whose speed cannot be adjusted faster than the main closing speed, but can be adjusted to provide a desired delay time prior to the door closing under normal regulation. The placement of the interdependent hydraulic system in the checking end of the closer allows the closer to have a fully adjustable independent backcheck.

REFERENCES:
patent: 1152339 (1915-08-01), Norton
patent: 2790991 (1957-05-01), Schlage
patent: 3220047 (1965-11-01), Flint
patent: 3934307 (1976-01-01), Lasier et al.
patent: 4115897 (1978-09-01), Zunkel

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