MICROALLOYED SPRING

• US 20130270755A1
• Filed: 06/13/2013
• Published: 10/17/2013
• Est. Priority Date: 04/18/2008
• Status: Active Grant

• Current Assignee: Dreamwell Limited (Serta Simmons Bedding LLC)
• Original Assignee: Dreamwell Limited (Serta Simmons Bedding LLC)
• Inventors: DeFranks, Michael S., Lynn, Jeremy B., Ready, William J.
• Granted Patent: US 8,919,752 B2
• Time in Patent Office: Days
• US Class Current: 267/166
• CPC Class Codes: A47C 23/0438 of special shape
• CPC Class Codes: A47C 27/005 liquid-impermeable
• CPC Class Codes: A47C 27/064 Pocketed springs
• CPC Class Codes: A47C 27/065 of special shape
• CPC Class Codes: A47C 31/001 Fireproof means
• CPC Class Codes: A47C 31/007 Anti-mite, anti-allergen or anti-bacterial means
• CPC Class Codes: B60N 2/7094 Upholstery springs
• CPC Class Codes: F16F 1/021 characterised by their composition, e.g. comprising materials providing for particular spring properties composition and manufacture of clock or watch springs G04B1/145
• CPC Class Codes: F16F 1/04 Wound springs making springs by coiling wire B21F3/00
• CPC Class Codes: F16F 1/06 with turns lying in cylindrical surfaces
• CPC Class Codes: F16F 3/04 composed only of wound springs

Abstract

The systems and methods described herein include innerspring assemblies or innerspring cores for use with cushioning articles such as mattresses. The innerspring core may have one or more coil springs formed from a high-carbon steel wire alloyed with one or more suitable alloying elements such as titanium and copper and capable of imparting greater strength and durability to the innerspring core.

Claims

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 ranging from 0.001 to about 0.1 weight percent of the spring, and wherein a total amount of the alloying element is from about 0.001 to about 2 weight percent of the spring

2. The coil spring of claim 1, wherein the alloying element includes manganese that is from about 0.3 to about 0.9 weight percent of the spring.

3. The coil spring of claim 1, wherein the alloying element includes vanadium that is from about 0.001 to about 0.23 weight percent of the spring.

4. The coil spring of claim 1, wherein the alloying element includes molybdenum that is from about 0.001 to about 1.15 weight percent of the spring.

5. The coil spring of claim 1, wherein the alloying element includes niobium that is from about 0.001 to about 0.1 weight percent of the spring.

6. The coil spring of claim 1, wherein the alloying element includes copper that is from about 0.1 to about 0.3 weight percent of the spring.

7. The coil spring of claim 1, wherein the alloying element includes titanium and copper.

8. The coil spring of claim 7, wherein the titanium is about 0.001 to about 0.01 weight percent of the spring and the copper is about 0.1 to about 0.3 weight percent of the spring.

9. The coil spring of claim 7, wherein the spring includes from about 10 to about 30 times more copper than titanium.

10. The coil spring of claim 1, wherein the spring includes about four times more carbon than at least one of the alloying elements.

11. The coil spring of claim 1, wherein the steel wire includes a plurality of strands.

12. The coil spring of claim 1, further comprising an encasing material formed around the helical spring.