Door control device

Details Door control device Door control device

1994-01-16

1996-01-30

Denion, Thomas E.

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

Checks and closers

Liquid

92240, 92181R, E05F 310

Patent

active

054872065

ABSTRACT:
A door closing device comprises a piston (12) having at one end a seal (21) which seals the interface between the piston and a housing (10). The seal (21) also acts as a one-way valve and carries a pressure relief valve (37).

REFERENCES:
patent: 1299668 (1919-04-01), Blomquist
patent: 2461106 (1949-02-01), Brandt
patent: 2727471 (1955-12-01), Martin
patent: 2774987 (1956-12-01), Ring et al.
patent: 2953810 (1960-09-01), Hall
patent: 3057004 (1962-10-01), Sogoian
patent: 3129453 (1964-04-01), Turner
patent: 3224378 (1965-12-01), Graham
patent: 3284841 (1966-11-01), Patriquin
patent: 3980004 (1976-09-01), Jones et al.
patent: 4792065 (1988-12-01), Soehnlein et al.
patent: 5187835 (1993-02-01), Lee
patent: 5193433 (1993-03-01), Reimer
United Kingdom Search Report on Application No. GB 9300288.9 (1 page).
European Search Report on Application No. EP 93 12 0951 (1 page).

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