Method for providing pocketed coil strings having a flat overlap

Details Method for providing pocketed coil strings having a flat overlap Method for providing pocketed coil strings having a flat overlap

1988-06-13

1989-08-08

Echols, P. W.

Metal working

Upholstered article making

Tufting

5477, 53450, 53550, 53114, 156 70, B68G 700

Patent

active

048540234

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.

REFERENCES:
patent: 1466617 (1923-08-01), Foster
patent: 1950186 (1934-03-01), Lofman
patent: 3462779 (1969-08-01), Thompson
patent: 3668816 (1972-06-01), Thompson
patent: 4234983 (1980-11-01), Stumpf
patent: 4439977 (1984-04-01), Stumpf
patent: 4451946 (1984-06-01), Stumpf
patent: 4485506 (1984-12-01), Stumpf et al.
patent: 4578834 (1986-04-01), Stumpf
patent: 4722168 (1988-02-01), Heaney

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