Assembly of ring binders and resulting product
US4582442A · kind A · utility
21Cited by
9References
7Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Apr 12, 1985 |
| Grant date | Apr 15, 1986 |
| Priority date | — |
| Expiry date | Apr 12, 2005 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB42C7/002
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
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 backplate. The ring hardware is secured to the backplate by inserting plastic rivets through apertures in the ring hardware aligned with counterbored holes in the backplate rib and sonically welding the rivet therein. The rivets and counterbored holes of the backplate rib facilitate the welding operation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.