Pocketed spring unit and method and apparatus for forming the same
US10633245B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 30, 2015 |
| Grant date | Apr 28, 2020 |
| Priority date | — |
| Expiry date | Dec 17, 2035 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB68G15/00
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
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.The external anvils are then made to apply heat and pressure to the material flaps trapped between them and the internal anvils at the sides of the pockets, between the springs to weld them to the material from the rolls 48.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.