Method and apparatus for making a series of pocketed coil springs
US4439977A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 16, 1981 |
| Grant date | Apr 3, 1984 |
| Priority date | — |
| Expiry date | Jul 16, 2001 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T156/1737
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
A method and apparatus are disclosed for making a series of coil springs pocketed within individual pockets in an elongate fabric strip comprised of two overlying plies capable of being thermally welded together. The fabric strip is fed along a guide path during which compressed coil springs are inserted between the piles with the axes of the springs substantially normal to the planes of the plies, whereafter the fabric plies are thermally welded together longitudinally and transversly to form a series of connected pocketed springs. After thermal welding, the pocketed springs are passed through a turner assembly during which the coil springs are reoriented within the fabric pockets to positions wherein the axes of the springs are transverse to the fabric strip.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.