Miscellaneous hardware (e.g. – bushing – carpet fastener – caster – Checks and closers
Patent
1994-08-31
1996-04-16
Bradley, P. Austin
Miscellaneous hardware (e.g., bushing, carpet fastener, caster,
Checks and closers
16 71, 16 51, E05F 300
Patent
active
055070701
ABSTRACT:
A mechanism for controlling the opening and closing of a closure object, comprising an outer cylinder whose inner chamber, contains hydraulic fluid, a distal end of the outer cylinder being attachable to either a closure object or an object to be closed. A circumferential single groove is located in an inner wall of the outer cylinder and a piston shaft telescopically received within the outer cylinder extends proximally therefrom, being attachable to either a closure object or an object to be closed, and distally into the inner chamber. A piston head is mounted distally on the piston shaft. The piston head contains a bore therethrough, a peripherally located circumferential retaining groove, and an inclined outer surface which increases in cross section in the distal direction. A seal prevents hydraulic fluid from passing around the piston head between the distal chamber and the proximal chamber. A snap ring, partially housed within the single groove, engages the inclined outer surface of the piston head. A retainer is mounted proximate the distal end of the piston shaft and a valve plate, with an orifice extending therethrough, is slideably mounted on the piston shaft between it and the piston head.
REFERENCES:
patent: 3765053 (1973-10-01), Anweiler
patent: 4663800 (1987-05-01), Mettenleiter et al.
patent: 4973097 (1990-11-01), Hosan et al.
patent: 5157806 (1992-10-01), Wartian
Fijas David A.
Spyche, Jr. Gerald J.
Bradley P. Austin
Enidine Inc.
Mah Chuck Y.
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