Method of making spring core for a bedding or seating product

摘要

Disclosed herein is a method of making a spring core (12) for a bedding or seating product (10). The spring core (12) has coil springs (26) having unknotted end turns (72, 74) made from high tensile strength wire. In each embodiment, the end turns (72, 74) of the coil springs (26) are generally U-shaped having one arcuate leg (76) longer than the other (78), the legs (76, 78) being joined by a connector (80) having an arcuate bump (81) therein. The springs (26) are oriented in the spring core (12) such that a long leg (76) of one end turn (72) abuts a short leg (78) of the adjacent end turn (72) prior to being wrapped in helical lacing wire (32). The high tensile wire enables the coil springs (26) to be manufactured using less wire than heretofore possible.

主权项

1. A method of making a spring core for a bedding or seating product, comprising:
providing upper and lower border wires and a plurality of identically configured coil springs each made of a single piece of wire having a central spiral portion defining a central spring axis and terminating at opposing ends with unknotted upper and lower end turns disposed in planes substantially perpendicular to the spring axis, each of said upper and lower end turns being substantially U-shaped and having a first leg and a second leg joined by a connector having a bump, each of said end turns terminating in a free end, said first leg being at the free unknotted end of one of said end turns and the second leg being at the free unknotted end of the other of the end turns, the connector of one of the end turns being on the opposite side of the central spiral portion than the connector of the other end turn, arranging the coil springs in side-by-side rows and columns, and connecting adjacent rows of coil springs at the upper and lower end turns of the coil springs by helical lacing wires to form a spring core, the coil springs being oriented the same direction in the spring core except some of the coil springs of the outermost columns of the spring core, securing the coil springs of the outermost columns to only one of the upper and lower border wires.