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US 4,251,892 AGranted
Box spring assembly with arcuate bendable springs
AssigneeHoover Universal, Inc.
InventorWilliam L. Hancock
Life of this patent
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AssigneeHoover Universal, Inc.
InventorWilliam L. Hancock
Estimating the term…
A box spring assembly which includes a generally rectangular frame, a plurality of upwardly extending wire springs mounted on the frame, and a wire grid supported on the upper ends of the springs so that the grid and springs cooperate to yieldably resist downwardly directed bedding loads. Each of the springs has a body comprised of two side-by-side arcuate portions formed integral at their upper ends with torsion bars that are connected by a connecting bar located between the arcuate portions. The arcuate body portions thus resist bedding loads with bending stresses and without any areas of stress concentration that would cause early spring failure. The torsion bars in each spring divide the spring load and resist bedding loads principally with torsional stresses, the combination of both bending and torsional stresses in the springs enabling increased load-resisting capabilities in the springs with a resulting efficient use of spring wire material.
In a box spring assembly which includes a generally horizontal, rectangular frame, a plurality of wire springs mounted on said frame and connected to each other so as to yieldably resist downwardly directed bedding loads, each of said springs being formed of spring steel wire and having a body comprised of two side-by-side arcuate portions, each of said arcuate portions being upright and being formed integral at its lower end with a mounting foot secured to said frame so that in response to downwardly directed loads said body portions will bend in substantially vertical planes, each of said arcuate portions being formed integral at its upper end with a torsion bar located so that the torsion bars in said body are in substantially the same horizontal plane and are spaced horizontally, a connecting bar extending between said torsion bars, and a wire grid supported on and secured to the upper ends of said springs.
A box spring assembly comprising a rectangular frame having side rails, end rails, and a plurality of cross rails that are generally parallel and are substantially perpendicular to said side rails, a plurality of wire springs mounted on said cross rails and connected to each other so as to yieldably resist downwardly directed bedding loads, each of said springs being formed of spring steel wire and having a body comprised of two side-by-side arcuate portions, each of said arcuate portions being upright and being formed integral at its lower end with a mounting foot secured to one of said cross rails so that in response to downwardly directed loads, said body portions will bend in substantially vertical planes, said vertical planes being substantially parallel and being generally perpendicular to said cross rails, each of said arcuate portions being formed integral at its upper end with a torsion bar located so that the torsion bars in said body are in substantially the same horizontal plane and are spaced horizontally in a direction generally perpendicular to said cross rails, a connecting bar extending between said torsion bars and positioned generally perpendicular to said torsion bars, and a wire grid having some wires substantially parallel to and disposed on top of said torsion bars and other wires substantially parallel to and disposed on top of said connecting bars, and clip means securing said grid wires to the bars on which they are disposed.
Dependencies are inferred from the claim text.