Door closer

Details Door closer Door closer

1997-10-28

1998-12-22

Mah, Chuck Y.

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

Closers

Spring and gear

16 71, E05F 108

Patent

active

058506713

ABSTRACT:
A hydraulically damped door closer is described which has a relatively weak closer spring (3c) and stronger back-up closer springs (3a, 3b). If, after a predetermined time period, the door does not arrive in the closed position under the effect of the closer spring (3c), the back-up closer springs (3a, 3b) are connected for the closing. Their connection is therefore controlled by way of a time function element, which represents a simple and, at the same time, reliable control.

REFERENCES:
patent: 3561036 (1971-02-01), Crane
patent: 3911527 (1975-10-01), Lasier
patent: 4115897 (1978-09-01), Zunkel
patent: 4378612 (1983-04-01), Beers
patent: 4580365 (1986-04-01), Sieg
patent: 4590639 (1986-05-01), Fritsche et al.
patent: 4744125 (1988-05-01), Scheck et al.
patent: 4763385 (1988-08-01), Furch et al.
patent: 4999872 (1991-03-01), Jentsch
patent: 5259090 (1993-11-01), Fayngersh
patent: 5343593 (1994-09-01), Fayngersh

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