Synthetic organic polymeric plastic sling protected by vulcanized or cured elastomeric laminate at load contacting area thereof
US4200325A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 23, 1977 |
| Grant date | Apr 29, 1980 |
| Priority date | — |
| Expiry date | Sep 23, 1997 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD07B5/005
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
A web sling, such as one of the endless, standard eye-and-eye or twisted eye type, is made from a web of woven synthetic organic polymeric plastic strands, such as those made from nylon, aramid or polyethylene terephthalate filaments, with a lamina of elastomeric material, such as polyurethane, vulcanized or cured onto a load contacting area thereof. The elastomeric material penetrates surface openings between the polymeric plastic strands but may be prevented from penetrating through the web, when so desired. To assist the elastomer in holding tightly to the strands there is applied to the web before vulcanizing a thin coating of a curable adhesive material, such as resorcinol-formaldehyde. In preferred embodiments of the invention particular thicknesses of filaments, strands, webs, adhesive coatings and elastomeric coverings are employed, the sides of the web are also integrally covered with the elastomer in the areas thereof designed to contact a load to be lifted or carried and the areas thereof designed to contact the lifting member are also so covered. Also within the invention are methods of manufacturing the described webs and slings. The slings of this invention are longer…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.