Assembly of ring binders and resulting product
US4722628A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 24, 1986 |
| Grant date | Feb 2, 1988 |
| Priority date | — |
| Expiry date | Oct 24, 2006 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C66/8322
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
An elongated hollow rectangular spine or backplate formed of plastic material for supporting and securing ring hardware in a loose-leaf binder has spaced, parallel, front and back walls joined at the edges and a centrally disposed strengthening rib extending between the front and back walls longitudinally for the length of the back plate. The ring hardware is secured to the backplate by inserting circumferentially grooved metal rivets through apertures in the ring hardware, pressing into the backplate rib and sonically welding the rivet therein. The circumferential grooves on the rivet shank facilitate anchoring the rivets to the backplate rib.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.