Chair spring tension control

Details Chair spring tension control Chair spring tension control

2008-01-08

2008-01-08

McPartlin, Sarah B. (Department: 3636)

Chairs and seats

Back movement resiliently opposed in operating position

Adjustable resistance

C297S302400, C297S300500

Reexamination Certificate

active

07316453

ABSTRACT:
A tilt mechanism for an office chair includes a spring tension control that incorporates a wedge arrangement including a moveable wedge component that is displaceable laterally by turning a control knob below the seat of the chair, to force fixed wedge components apart and increase the spring tension. Turning the knob in the opposite direction reduces spring tension.

REFERENCES:
patent: 1926259 (1933-09-01), Bitzenburger
patent: 2110874 (1938-03-01), Herold
patent: 3453024 (1969-07-01), Williams
patent: 4744600 (1988-05-01), Inoue
patent: 4830431 (1989-05-01), Inoue
patent: 2001/0013569 (2001-08-01), Donati

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