Miscellaneous hardware (e.g. – bushing – carpet fastener – caster – Checks and closers – Hinge
Patent
1997-03-31
1999-01-05
Mah, Chuck Y.
Miscellaneous hardware (e.g., bushing, carpet fastener, caster,
Checks and closers
Hinge
16 54, 16 71, E05F 320
Patent
active
058550402
ABSTRACT:
A hinge structure of rotary door, including a mechanical rotary hinge and a buffering rotary hinge inserted in a hinge casing. An upper section of the rotary shaft of the buffering rotary hinge is formed with two opposite ring seats. A flange body is slidably fitted around the rotary shaft between the ring seats. An upper and a lower edges of the flange body and the ring seats are respectively disposed with corresponding projecting wedge edges and recessed wedge edges so as to lift or lower the rotary shaft along with the opening or closing of the door. A flange body is formed with an insertion hole and the ring seat is formed with a slide slot to be inserted in the casing. A piston body disposed with oil seal ring is fitted with the end of the rotary shaft to be slidably disposed in an oil cylinder. The piston body is formed with an annular groove communicated with a lower chamber by several through holes for fast opening the door. The rotary shaft in the piston body is disposed with an oil vent communicated with the cenrtral shaft hole at the up per and lower chambers to buffer the closing the door. The end of the inner wall of the oil cylinder is formed with an expansion section for releasing the buffering force at the end stage of closing of the door.
REFERENCES:
patent: 4068344 (1978-01-01), Okabe
patent: 4073037 (1978-02-01), Curry et al.
patent: 4155144 (1979-05-01), Koganei
patent: 4756051 (1988-07-01), Shy
patent: 5152029 (1992-10-01), Pai
patent: 5383253 (1995-01-01), Lin
Dawnwell Int'l Co., Ltd.
Mah Chuck Y.
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