Hydraulic door closer construction

Details Hydraulic door closer construction Hydraulic door closer construction

1978-07-27

1983-07-26

Dorner, Kenneth

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

Checks and closers

Liquid

16 62, 277DIG3, 285351, E05F 314

Patent

active

043947875

ABSTRACT:
A hydraulic door closer is provided with a fluid seal for its output shaft, the seal comprising multiple O-rings disposed side-by-side in an elongated annular chamber.

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patent: 633682 (1899-09-01), Cliff
patent: 1178688 (1916-04-01), Stronach
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patent: 2765185 (1956-10-01), Mott
patent: 3076683 (1963-02-01), Hanley
patent: 3106743 (1963-10-01), Ellis et al.
patent: 3160426 (1964-12-01), Faeser
patent: 3194589 (1965-07-01), Kahlbau et al.
patent: 3485142 (1969-12-01), Kutas et al.
patent: 3546734 (1970-12-01), Pollack et al.
patent: 4080687 (1978-03-01), Jentsch
Parker Seal Company, 1971, pp. 1-8, 1-9, 6-21, 6-22, 6-23.

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