Chair with adjustable back

Details Chair with adjustable back Chair with adjustable back

1976-01-05

1977-02-15

Mitchell, James C.

Chairs and seats

Back movement resiliently opposed in operating position

Constantly oriented during up-and-down movement

297355, 297408, A47C 300

Patent

active

040079627

ABSTRACT:
A work chair with an upholstered, adjustable seat and back which gives ergonomically correct support to the occupant's spine. The chair back comprises a back support and a shoulder support. The lower end of the back support is pivotally mounted in a rounded buttocks support at the rear of the chair seat. The shoulder support is pivotally mounted at the upper end of the back support. Both parts are contoured to correspond to the natural position of the spine. The inclinations of the back support and shoulder support are independently governed by a gas spring device and a torsion member respectively.

REFERENCES:
patent: 2685327 (1954-08-01), Pitman
patent: 3172699 (1965-03-01), Naughton
patent: 3189312 (1965-06-01), Bilancia
patent: 3837704 (1974-09-01), Bauer

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