Underseat mechanism for a chair

Details Underseat mechanism for a chair Underseat mechanism for a chair

1992-02-20

1994-02-15

Kannan, Philip C.

Chairs and seats

Movable back

297301, 297328, 297374, A47C 746

Patent

active

052860884

ABSTRACT:
An arrangement providing a backrest support pillar, particularly, though not exclusively, for an office chair whereby the height of a backrest can be selected by the user in a simple and ready manner using one hand. More particularly an arrangement is contemplated wherein the pillar is adjustable from a maximum length to a minimum length without resistance and is adjustable incrementally from that minimum length and automatically maintainable at a selected length. The invention also provides a seat/back synchronous tilt mechanism for a chair which eliminates the "shirt-lifting" effect of known chairs.

REFERENCES:
patent: 4062587 (1977-12-01), Wolters
patent: 4143910 (1979-03-01), Geffers et al.
patent: 4629249 (1986-12-01), Yamaguchi
patent: 4639039 (1987-01-01), Donovan
patent: 4640547 (1987-02-01), Fromme
patent: 4693514 (1987-09-01), Volkle
patent: 4786108 (1988-11-01), Dauphin
patent: 5037158 (1991-08-01), Crawford

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