Chairs and seats – Bottom or back – Contoured back
Patent
1993-08-04
1995-09-26
Cranmer, Laurie K.
Chairs and seats
Bottom or back
Contoured back
29745227, 29725235, 29745237, 297DIG1, A47C 702
Patent
active
054529409
ABSTRACT:
An integral lower back pressure relief cushion with a substantially U-shaped aperture at the lower portion of the cushion open at the bottom and extending from the front to the rear of the cushion, such that the sacral and coccyx areas of the user are free from pressure contact while the portions of the cushion on either side of the aperture support the posterior superior iliac spine of the user, the cushion comprising at least three segments of resilient material, a removable convex shape in the front side above the aperture, and the rear side having a convex side and support base.
REFERENCES:
patent: 2855986 (1958-10-01), Engelen
patent: 3749442 (1973-07-01), Berg et al.
patent: 4189182 (1980-02-01), Rhoe
patent: 4951334 (1990-08-01), Maier
patent: 5039158 (1991-08-01), Maier
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