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US 4,502,728 AGranted
Portable seat and back rest
AssigneeNepsco, Inc.
InventorsSamuel B. Sheldon, Jack L. Leach, Scott A. Harkness
Life of this patent
Estimating the term…
Abstract
A portable seat and back rest that can be folded for convenient carrying includes a seat and back rest having spring steel plates as frames and covered by foam pads. The curvature of the back rest is controlled by a slide assembly movable on tracks on the rear of the back rest.
Claims14
A portable seat and back rest assembly comprising
- a pair of spring-like plates hinged together to form a seat rest frame and a back rest frame,
- a soft foam cover on the top surface of the seat plate and on the front surface of the back rest plate,
- a pair of parallel tracks mounted on the back of the back rest plate, one adjacent each side edge of the plate,
- an adjusting slide mounted on the tracks and bearing against the back of the back rest plate and imparting a forward transverse bow in the back rest plate to provide a lumbar support,
- and friction means forming part of the slide and engaging the tracks to yieldably retain the slide at any selected vertical elevation on the tracks.
2 more elements
A back rest assembly comprising a back rest plate made of a flexible material,
- a slide assembly mounted on the back surface of the back rest plate and movable vertically against the back surface to change the curvature of the plate and produce a horizontal ridge across it to press against the small of the back of the user of the back rest, said slide assembly including
- a pair of vertical tracks on the back of the back rest plate along the sides thereof and somewhat stiffer than the plate,
- a housing slidable up and down on each of the tracks and bearing against the back surface of the plate, and flexible band means connected to the two housings and bearing against the back surface of the plate between the housing,
- and means in the housings frictionally engaging the track to hold the assembly in any set vertical position on the tracks.
1 more element
Dependencies are inferred from the claim text.