Manufacture of pocket spring assemblies

Details Manufacture of pocket spring assemblies Manufacture of pocket spring assemblies

1997-12-22

2000-02-29

Le, Mark T.

Spring devices

Spring panel

With means to vary preliminary tension of spring

56558, F16F 300

Patent

active

060299576

ABSTRACT:
In the production of a pocket spring assembly, fabric is secured along multiple parallel seam zones so as to form a quilt defining a plurality of parallel fabric tubes connected to each other at uniformly spaced intervals. The tubes so formed are supported on guides extending longitudinally through the tubes, portions of the quilt are repeatedly drawn from the guides at their one ends and folds formed in each layer of fabric in the drawn off portion are secured to form pockets from the drawn off portions of the quilt, and precompressed coil springs are passed through the guides and released into the pockets between each drawing of the quilt, with their axes perpendicular to both the axes of the fabric tubes and the direction of advancement of the quilt, so that secured folds in the fabric of the tubes in front of and behind the released springs retain them in the pockets. The quilt may be formed either as a separate step, or in situ on the guide, and from separate superposed webs of fabric, or separate webs for each tube. The connections between the tubes preferably have a span perpendicular to the plane of the quilt which is similar to the span of the connections of the folds.

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patent: 3417544 (1968-12-01), Grevich
patent: 3513629 (1970-05-01), Hoagland et al.
patent: 4381637 (1983-05-01), Ballestrazzi et al.
patent: 4401501 (1983-08-01), Stumpf
patent: 4439977 (1984-04-01), Stumpf

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