Door closer to generate a sudden change in the transmission rati

Details Door closer to generate a sudden change in the transmission rati Door closer to generate a sudden change in the transmission rati

1998-12-31

2000-11-28

Mah, Chuck Y.

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

Checks and closers

Liquid

16 49, 16 58, 16 79, 16DIG17, 16DIG21, E05F 304

Patent

active

061517534

ABSTRACT:
A door closer with a door piston, which door piston is acted on by a driven shaft during the opening of a door. The door piston has an extension attached to it. The door closer also can have a pressure piston and an energy storage mechanism which acts on the pressure piston. The pistons can be axially guided and can interact with hydraulically connected pressure chambers to connect and disconnect the pistons during the opening and closing of the door closer.

REFERENCES:
patent: 4580365 (1986-04-01), Sieg
patent: 4686739 (1987-08-01), Fritsche et al.
patent: 4793023 (1988-12-01), Simpson et al.
patent: 4967444 (1990-11-01), Korling et al.
patent: 5259090 (1993-11-01), Fayngersh
patent: 5488896 (1996-02-01), Current

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