Chairs and seats – Bottom or back with means to alter contour – Having a plurality of adjacent relatively adjustable sections
Patent
1993-11-08
1996-09-24
Nelson, Jr., Milton
Chairs and seats
Bottom or back with means to alter contour
Having a plurality of adjacent relatively adjustable sections
2972846, 297DIG3, A47C 3025
Patent
active
055583989
ABSTRACT:
A seat back for a seating system wherein the contour of the seat back is automatically adjusted to the spinal curvature of an occupant by a multiplicity of compressible interconnected plenum chambers which project horizontally forward from the seat back and are connected to a source of air under sufficient pressure to inflate and maintain the plenum chambers fully extended when the seat is unoccupied. The plenum chambers are interconnected by either very small-diameter tubing, or tubing having small-orificed restrictors therein for reducing the rate of flow of air from one chamber to another for introducing a time delay between movement of the occupant and inflation and deflation of the chambers affected by such movement. The plenum chambers are arranged in one or more arrays each consisting of vertically-separated pairs, the chamber of each pair being equally spaced from a vertical center-line. When an occupant is seated, or shifts position while seated, air is automatically distributed among the plenums, at a controlled rate, so as to alter the horizontal extension of the plenum chambers and, accordingly, the contour of the array(s) to the spinal contour of the occupant.
REFERENCES:
patent: 2434641 (1948-01-01), Burns
patent: 3363941 (1968-01-01), Wierwille
patent: 3982786 (1976-09-01), Burgin et al.
patent: 4120061 (1978-10-01), Clark
patent: 4969684 (1990-11-01), Zarotti
patent: 5314235 (1994-05-01), Johnson
Jr. Milton Nelson
Olson Spencer E.
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