Method and system for forming strings of pocketed coil springs

US 6,499,275 B1
Method and system for forming strings of pocketed coil springs
Roland Graf, St. Gallen (Switzerland); Niels S. Mossbeck, Carthage, Mich. (US); and Thomas J. Wells, Carthage, Mich. (US)
Assigned to Spuhl AG St. Gallen, Wittenbach (Switzerland)
Filed on 16-Jun-2000, as Appl. No. Spuhl AG St. Gallen, Wittenbach (Switzerland)
Int. Cl.7B65B 63/02

US 6,499,275 B1 Method and system for forming strings of pocketed coil springs Roland Graf, St. Gallen (Switzerland); Niels S. Mossbeck, Carthage, Mich. (US); and Thomas J. Wells, Carthage, Mich. (US) Assigned to Spuhl AG St. Gallen, Wittenbach (Switzerland) Filed on Jun. 16, 2000, as Appl. No. 9/595,755. Application 09/595755 is a continuation in part of application No. 09/353483, filed on Jul. 13, 1999. Application 09/353483 is a continuation in part of application No. 09/293221, filed on Apr. 16, 1999. Int. Cl.7B65B 63/02 U.S. Cl. 538212;436 27 Claims 1. A method of forming a string of pocketed coil springs comprising the steps of: feeding a supply of fabric having first and second generally parallel plies; inserting a series of compressed springs between the first and second plies; joining the first and second plies together to form a longitudinal seam proximate free edges of the first and second plies; allowing the springs to at least partially expand to an extent permitted by the fabric so that a longitudinal axis of each of the springs is generally perpendicular to the longitudinal seam of the fabric; and forming a transverse seam in the fabric generally parallel to the longitudinal axis of the springs and between adjacent springs to thereby enclose each of the springs within a fabric pocket; wherein the transverse seam is formed after the springs are allowed to at least partially expand.