The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 14, 1989
Filed:
Jul. 06, 1987
John E Miller, Tupelo, MS (US);
Parma Corporation, Denton, NC (US);
Abstract
A mattress core particularly useful in a sofa bed has a plurality of rows of coil springs extending longitudinally of the coil in the head to foot direction thereof. A plurality of coiled spring wires extend transversely of the rows while interconnecting adjacent coil springs in each row and adjacent coil springs of adjacent rows by being wound about the coil springs. The coiled spring wires are located on opposite sides of the core. On only one side of the core which forms the sleep surface are a plurality of transversely extending 'torsion' spring wires, however, these wires are of a generally rectilinear shape with intermediate offset portions at intervals extending generally along the head to foot direction while being connected to the coil springs of each of the rows. The offset portions provide torsion arms providing torsional resistance to deflection at the sleep surface to thereby increase resistance to deflection while, at the same time, distributing loads across the sleep surface. The bottom side of the core opposite the sleep surface does not have the torsion wires and is therefore more flexible than the spring surface to facilitate compression of the core when moved into the sofa mode.