Adjustable chair

Details Adjustable chair Adjustable chair

1989-01-23

1989-08-08

Brown, Peter R.

Chairs and seats

Movable bottom

Interconnected with back for relative concurrent movement

297340, 297353, A47C 320

Patent

active

048546410

ABSTRACT:
A chair with adjustable seat height in which the height change, made to suit the size of a given occupant, will at the same time change the height of the back rest above the seat. The amount of rise of the back rest is arranged to be in accordance with the proportions of average people. There is a pivoting, four-bar parallelogram-type linkage which raises the back support relative to the seat as the seat is raised. The front part of the linkage is fixed in height while the rear part raises and lowers the seat back. The linkage is rotated upward at the rear of the chair by one pin in the middle of the linkage which rises with the seat. An additional movement is developed in the linkage by having it bent downward toward the rear of the chair. The movement developed is a shifting of the seat back rearward of the seat as the seat rises.

REFERENCES:
patent: 2365200 (1944-12-01), Lorenz
patent: 2615496 (1952-10-01), Lorenz et al.
patent: 2859799 (1958-11-01), Moore
patent: 3902755 (1975-09-01), Sirot
patent: 3913975 (1975-10-01), Carter
patent: 4173372 (1979-11-01), Norris
patent: 4387876 (1983-06-01), Nathan
patent: 4763950 (1988-08-01), Tobler

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