Patent ID: 8474805
Filing Date: 2013-07-02
Classification: A47C,B60N,F16F

Abstract:
1. A coil spring in an innerspring assembly in a cushioning article, comprising a high-carbon steel wire coiled into a helical spring and alloyed with an alloying element, wherein the high carbon steel wire includes carbon that is from about 0.50 to about 0.99 weight percent of the spring, wherein the high carbon steel wire has a diameter of 0.04 to 0.11 inches (1.016 to 2.794 millimeters); wherein the alloying element comprises titanium, silicon, and copper, the titanium ranging from 0.001 to about 0.1 weight percent of the spring, the silicon ranging from 0.001 to less than 0.55 weight percent of the spring, and the copper ranging from 0.1 to about 0.3 weight percent of the spring, and wherein a total amount of the alloying element is from 0.001 to 2 weight percent of the spring.