Door closer with assist or door operating features

Details Door closer with assist or door operating features Door closer with assist or door operating features

1980-05-27

1982-07-20

Krizmanich, George H.

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

Checks and closers

Liquid

49 30, 49 32, 49340, 91 38, 91318, E05F 300

Patent

active

043398430

ABSTRACT:
Hydraulic door closer apparatus has associated with it means for counter-balancing the bias of a return spring, to assist in opening the door by reducing the force needed to open it, or to open the door by over-balancing the bias of the return spring. Remotely manually operable means may initiate opening of the door.

REFERENCES:
patent: 2190653 (1940-02-01), Dunn
patent: 3084927 (1963-04-01), Linder
patent: 3145796 (1964-08-01), Padula
patent: 3160486 (1964-12-01), Busch
patent: 3478468 (1969-11-01), Martin
patent: 3864875 (1975-02-01), Hewitt

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