Protected prong file fastener and method of making
US8747588B1 · kind B1 · utility
1Cited by
18References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 8, 2011 |
| Grant date | Jun 10, 2014 |
| Priority date | — |
| Expiry date | Jan 19, 2032 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB42F3/04
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A prong style file fastener, and method of manufacturer, is disclosed which has a protective element to prevent damage to paper documents and personal injury. In one embodiment, the prongs of the fastener is covers with a heat shrinkable sheath. In another, the prongs are overcoated with a powder coating which is melted thereon. A method of applying the sheath to the prongs uses a pair of jaws to drive the sheath onto the prongs. In the case of the powdercoat covering, the production line uses a cam drive sprocket retractor to release the line onto a takeup.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.