Seat cushion

Details Seat cushion Seat cushion

1992-01-21

1994-03-15

Brittain, James R.

Chairs and seats

Bottom or back

Contoured bottom

29745257, 29745227, 297DIG1, 5653, A47C 718

Patent

active

052941817

ABSTRACT:
A seat cushion is described which has particular utility as a wheelchair seat cushion. The seat cushion includes a base layer of polyurethane foam with a front edge of greater height than the rear edge so as to define a downwardly sloping upper surface. The base layer supports an essentially constant thickness intermediate layer which is less firm than the base layer. The intermediate layer has a pair of laterally spaced recesses formed in the forward end of the intermediate layer which curve both upwardly and inwardly from the front edge of the intermediate layer. A top layer is secured to the intermediate layer and has a constant thickness. The top layer is formed of foam material which is less firm (e.g., a lower 65% IFD value) than the foam forming the intermediate layer. The intermediate layer is formed of a foam which is less firm (e.g., a lower 65% IFD value) than the material forming the base layer. The upper surface of the top layer defines a pair of depressions in the areas where the top layer is received within the recesses of the intermediate layer. The top layer includes a convoluted upper surface and in one embodiment the top layer includes a similarly convoluted extension which provides a backrest.

REFERENCES:
patent: D238235 (1975-12-01), Elgebrandt
patent: 1843893 (1932-02-01), Becher
patent: 2831532 (1958-04-01), Kasper
patent: 3000020 (1961-09-01), Lombard et al.
patent: 3118153 (1964-01-01), Hood
patent: 3393012 (1968-07-01), Chancellor, Jr.
patent: 3513491 (1970-05-01), Gordon
patent: 3939508 (1976-02-01), Hall et al.
patent: 3965508 (1976-06-01), Hunter
patent: 3987507 (1976-10-01), Hall
patent: 4132228 (1979-01-01), Green
patent: 4143916 (1979-03-01), Trotman et al.
patent: 4615856 (1986-10-01), Silverman
patent: 4637651 (1987-01-01), Sperr
patent: 4643481 (1987-02-01), Saloff et al.
patent: 4646374 (1987-03-01), Shafer
patent: 4753480 (1988-06-01), Morell
patent: 4828325 (1989-05-01), Brooks
patent: 4837881 (1989-06-01), Kondo et al.
patent: 4847933 (1989-07-01), Bedford
patent: 4879776 (1989-11-01), Farley
patent: 4951334 (1990-08-01), Maier
patent: 4953913 (1990-09-01), Graebe
patent: 4960304 (1990-10-01), Frantz
patent: 5022111 (1991-06-01), Fenner, Sr.
patent: 5079790 (1992-01-01), Pouch
patent: 5160785 (1992-11-01), Davidson, Jr.
patent: 5163737 (1992-11-01), Navach et al.

Affiliated with

Also associated with

Rating

Seat cushion does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Seat cushion, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Seat cushion will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1532746