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:
Sep. 12, 1978
Filed:
Apr. 04, 1977
Larry Higgins, Carthage, MO (US);
Leggett & Platt, Incorporated, Carthage, MO (US);
Abstract
An improved single cone coil spring and an improved box spring assembly made from the improved single cone coil springs. The box spring assembly comprises a base frame, a series of the improved small diameter single cone coil springs and a welded wire grid, the coil springs being connected at their bottom ends to the base frame and connected at their top ends to the welded wire grid. The coil springs are established in a plurality of rows and columns throughout the box spring assembly, at least one transverse wire and at least one longitudinal wire of the wire grid span all coil springs within each row and column, respectively. Further, a supplemental transverse wire is positioned between adjacent coil spring rows, and is of a length equal to at least one of the coil springs' transverse wires adjacent thereto. All crossover points of all the grid's transverse and longitudinal wires are welded to establish the welded wire grid. The improved single cone coil springs are all of the same diameter, that diameter being less than three and one-half inches in the top loop of the coil springs. The coil spring columns are separated one from the other, and the coil spring rows are separated one from the other, by a distance at least as great as the diameter of the coil springs.