Method for providing pocketed coil strings having a flat overlap side seam
AssigneeSimmons U.S.A. Corporation
InventorWalter Stumpf
Life of this patent
Estimating the term…
Abstract
An improved method and apparatus for constructing an improved pocketed coil string, in which a tube of fabric is formed, a transverse seam is provided across the tube, a partially compressed coil spring is inserted adjacent to the seam, and a second seam is provided, thus encapsulating the spring. The fabric is guided around the outer surface of a tubular mandrel, thus forming a tube, and the spring is inserted into the mandrel such that as the spring exits the opposite side of the mandrel, it is within the tube of fabric. Excessive spring compression is avoided.
Claims24
A method of forming pocketed coil strings, comprising the steps of:
- (a) forming an elongate tube of fabric having a longitudinal axis;
- (b) forming a first transverse seam across said tube;
- (c) inserting a spring into said elongate tube and positioning said spring adjacent to said transverse seam;
- and
- (d) forming a second transverse seam across said tube, said second transverse seam being positioned adjacent to said spring such that said first and second transverse seams are on opposite sides of said spring, and said spring is substantially enclosed by said fabric.
A method of forming pocketed coil strings, comprising the steps of:
- (a) forming an elongate tube of fabric over the outer surface of an elongate mandrel portion having a downstream end, such that a first portion of said tube substantially conforms to the outer surface of said mandrel portion and such that a second portion of said tube extends off said downstream end of said mandrel portion;
- (b) forming a first transverse seam across said second tube portion which extends off said downstream end of said mandrel portion;
- (c) inserting a spring into said elongate tube and positioning said spring adjacent to said first transverse seam;
- and
- (d) forming a second transverse seam across said tube, said second transverse seam being positioned adjacent to said spring such that said first and second transverse seams are on opposite sides of said spring, and said spring is substantially enclosed by said fabric.
A method of forming pocketed coil strings, comprising the steps of:
- (a) forming an elongate tube of fabric over the outer surface of an elongate mandrel portion having a downstream end and having a longitudinal axis substantially parallel to a first axis, such that a first portion of said tube substantially conforms to the outer surface of said mandrel portion and such that a second portion of said tube extends off said downstream end of said mandrel portion;
- (b) forming a first transverse seam across said second tube portion which extends off said downstream end of said mandrel portion, said seam having a longitudinal axis that lies in a first plane that is substantially normal to said first axis;
- (c) inserting a spring into said elongate tube and positioning said spring adjacent to said first transverse seam;
- (d) urging said spring against said first transverse seam along a second axis substantially parallel to said first axis, such that said spring and said tube are urged along said second axis and said spring passes through said first plane;
- and
- (e) forming a second transverse seam across said tube, said second transverse seam being positioned adjacent to said spring such that said first and second transverse seams are on opposite sides of said spring, and said spring is substantially enclosed by said fabric.
Dependencies are inferred from the claim text.