Chairs and seats – Back movement resiliently opposed in operating position – Back adjusts independent of seat
Patent
1993-11-03
1995-05-30
Dorner, Kenneth J.
Chairs and seats
Back movement resiliently opposed in operating position
Back adjusts independent of seat
297304, A47C 702
Patent
active
054196159
ABSTRACT:
A chair includes a movable base, a first pneumatic cylinder, a support frame, a pivot frame, an elongated spring plate unit, and a second pneumatic cylinder. The first pneumatic cylinder is mounted uprightly on the movable base. The support frame has an upright sleeve which is sleeved rotatably on a top end of the first pneumatic cylinder, an arm plate which extends forwardly from a top end of the sleeve, and parallel front and rear shafts which are mounted transversely on the arm plate. The pivot frame has a front end that is mounted pivotally on the rear shaft and further has a seat and a backrest fixed thereon. The spring plate unit has a rear end portion which is mounted on the front end of the pivot frame and a front end portion which extends underneath and abuts with the front shaft. The second pneumatic cylinder is connected to a bottom end of the support frame and to a rear end of the pivot frame, and is operable so as to vary a length thereof in order to cause pivoting movement of the pivot frame and permit retaining of the seat and the backrest at desired inclined positions.
REFERENCES:
patent: 4703974 (1987-11-01), Brauning
patent: 4707029 (1987-11-01), Korn
patent: 4743065 (1988-05-01), Meiller et al.
patent: 4979778 (1990-12-01), Shields
patent: 5069496 (1991-12-01), Kunh et al.
Dorner Kenneth J.
Jr. Milton Nelson
Shin Yeh Enterprise Co., Ltd.
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