Height adjusting mechanism for chair back

Details Height adjusting mechanism for chair back Height adjusting mechanism for chair back

1981-03-11

1983-05-24

Lyddane, William E.

Chairs and seats

Movable back

248408, 403107, 403325, A47C 100

Patent

active

043847420

ABSTRACT:
An adjustable mechanism for use with an office chair, such as a secretarial chair, to allow vertical adjustment of the seat back. The mechanism includes a slide which is mounted on the chair back and is vertically slidably supported on an upright which projects from the seat portion of the chair. The slide has a latching lever pivotally mounted thereon and spring-urged into engagement with one of a series of notches formed along one side of an elongated slot formed in the upright. The notches, together with the latching projection formed on the lever, are defined by upper and lower edge surfaces which are individually generated about a centerpoint which is coincident with the pivot axis of the lever to maintain the chair back securely latched when either upward or downward external forces are imposed thereon.

REFERENCES:
patent: 3802658 (1974-04-01), Binding
patent: 4012158 (1977-03-01), Harper
patent: 4036525 (1977-07-01), Howk
patent: 4043592 (1977-08-01), Fries
patent: 4221430 (1980-09-01), Frobose

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