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Title:
POCKETED SPRING UNIT AND METHOD AND APPARATUS FOR FORMING THE SAME
Document Type and Number:
WIPO Patent Application WO/2019/034849
Kind Code:
A3
Abstract:
Apparatus for forming a pocketed spring unit, comprising a plurality of strings of pocketed springs and at least one cover sheet, comprises welding tools for welding together the pocketing material and the sheet. One of the welding tools (200) is provided with a cutter (230) for cutting the pocket prior to welding. The tool (200) travels in the direction of Arrow Al, so that the cutter (230) penetrates the pocketing material substantially centrally at the circular proximal end face 160 of the pocket (110a). Once inside the pocket (110a), the tool (200) moves axially through the centre of the spring (120) until it reaches the distal end face (150) of the pocket. Before the end face (150) is reached, the piercing member becomes retracted in the direction of Arrow A2, so that the blade does not pierce the distal end face (150) of the pocket (110a).

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Inventors:
SPINKS SIMON (GB)
CLARE DAVID (GB)
MARCANGELO DARREN (GB)
ESSERY RICHARD (GB)
Application Number:
PCT/GB2018/052278
Publication Date:
May 23, 2019
Filing Date:
August 10, 2018
Export Citation:
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Assignee:
HS PRODUCTS LTD (GB)
International Classes:
B29C65/18; A47C27/06; B29C65/74
Domestic Patent References:
WO2015114361A12015-08-06
Attorney, Agent or Firm:
MOHUN, Stephen (GB)
Download PDF:
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