Pocketed spring unit and method and apparatus for forming the same
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United States of America Patent
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Apr 28, 2020
Grant Date -
Jan 12, 2017
app pub date -
Jan 30, 2015
filing date -
Jan 30, 2014
priority date (Note) -
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Abstract
A method of forming a pocketed spring unit for an upholstered article comprises taking successive strings of pocketed springs and welding at least one sheet of material to at least a first end of the pocketed springs. Anvils 46 are moved from a non-operative position to an operative position, in which they are located between adjacent pockets at upper and lower ends of the springs. This embodiment makes use of the surplus material that is formed at the ends of the pockets in the form of flaps or “ears” of material. These flaps protrude upwardly initially, and then become folded flat as the spring unit advances between the rolls 48 of material.
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