Chairs and seats – Bottom or back with means to alter contour – Providing support for lower back region
Patent
1993-05-19
1994-04-05
Brown, Peter R.
Chairs and seats
Bottom or back with means to alter contour
Providing support for lower back region
2972844, A47C 746
Patent
active
052998517
ABSTRACT:
An adjustable cushion assembly includes a cushion, a covering enclosing the cushion, an upright flexible metal plate disposed behind the cushion, and an adjustment device. The metal plate has several pairs of aligned horizontal notches that are formed in two opposite side portions thereof. The adjustment device includes a generally vertical flexible pull rod abutting against the metal plate and having an upper end portion secured to the metal plate. A threaded horizontal rod is journalled on a lower end portion of the metal plate, A movable nut member engages threadably the horizontal rod. An inclined first connecting rod has a lower end connected pivotally to the nut and an upper end connected pivotally to the lower end of the pull rod. An inclined second connecting rod has a lower end mounted pivotally on the metal plate and an upper end mounted pivotally on the lower end of the pull rod. Accordingly, when the horizontal rod is rotated, the nut member moves on the horizontal rod so as to increase an angle between the first and second connecting rods, thereby moving the pull rod downward. The downward movement of the pull rod flexes the metal plate and the cushion.
REFERENCES:
patent: 3724144 (1973-04-01), Schuster
patent: 4316631 (1982-02-01), Lenz et al.
patent: 4354709 (1982-10-01), Schuster
patent: 4632454 (1986-12-01), Naert
patent: 5088790 (1992-02-01), Wainwright et al.
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