Miscellaneous hardware (e.g. – bushing – carpet fastener – caster – Checks and closers – Pneumatic
Patent
1997-05-29
1999-09-28
Mah, Chuck Y.
Miscellaneous hardware (e.g., bushing, carpet fastener, caster,
Checks and closers
Pneumatic
16 49, E05F 302
Patent
active
059568062
ABSTRACT:
A door closer has a cylindrical body `A` installed in a swing door and a base plate `B` fixed to a wall `C` standing still and near the door. The body `A` has an oil-hydraulic third cylinder 3 fixed by a connecting pin 4 in a second cylinder 2, which slides in a first cylinder 1 serving as an outer casing. A piston rod 7 displaceable into and out of the third cylinder has a front end fixed to a piston 5 in this, and a rear end fixed to a piston 6 at rear end of the second cylinder. A tie rod 9 connects the second cylinder's front end to the base plate, and an airtight chamber 10 is defined between the piston 6 and the first cylinder's inner end wall. An air suction passage 12 is formed through which the chamber communicates with atmosphere, a one-way valve 11 disposed in the passage allows only suction of air into the chamber, and a thin ventilation hole 13 communicates with the airtight chamber.
REFERENCES:
patent: 1898609 (1933-02-01), Anderson
patent: 3042957 (1962-07-01), Muessel et al.
patent: 3143757 (1964-08-01), Quinn
patent: 3531820 (1970-10-01), Koivusalo
patent: 4102006 (1978-07-01), Jenkins
patent: 5170530 (1992-12-01), Kopec et al.
Daiyasu Metal Industry Co., Ltd.
Gurley Donald M.
Mah Chuck Y.
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