Pneumatic cylinder of a pneumatic lever-lift chair, and its asse

Details Pneumatic cylinder of a pneumatic lever-lift chair, and its asse Pneumatic cylinder of a pneumatic lever-lift chair, and its asse

1996-04-17

1997-12-30

Ramirez, Ramon O.

Supports

Stand

Standard type

248161, 248631, 267 6412, 29734419, F16M 1100

Patent

active

057020833

ABSTRACT:
A pneumatic cylinder for use in a pneumatic lever-lift chair, including a cylindrical casing having an inward bottom flange and a plurality of vertically spaced inside annular flanges, a stop plate mounted inside the cylindrical casing and having a plurality of raised portions at the bottom respectively welded to the inward bottom flange of the cylindrical casing by a spot welding machine, and an inner barrel mounted inside the cylindrical casing and having an outward top flange stopped above the top end of the cylindrical casing and a plurality of vertically spaced annular grooves around the periphery respectively forced into engagement with the inside annular flanges of the cylindrical casing.

REFERENCES:
patent: 3891270 (1975-06-01), Crossman et al.
patent: 4720068 (1988-01-01), Tornero
patent: 4940202 (1990-07-01), Hosan et al.
patent: 4969619 (1990-11-01), Bauer et al.
patent: 5078351 (1992-01-01), Gualtieri
patent: 5413414 (1995-05-01), Bauer
patent: 5443573 (1995-08-01), Thiele et al.
patent: 5462248 (1995-10-01), Bauer
patent: 5556170 (1996-09-01), Lai et al.

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