Paper punch
US5386638A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 19, 1993 |
| Grant date | Feb 7, 1995 |
| Priority date | — |
| Expiry date | Aug 19, 2013 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T83/222
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A paper punch having a pair of pivotably mounted top struts and a pair of pivotably mounted bottom struts, with the pair of top struts being pivotably mounted to the pair of bottom struts. As mounted, the pairs of struts can fold against each other. Associated with each adjacent top and bottom strut is a die which moves through guide openings when the struts are moved into their operative position away from each other. A spring is situated between each adjacent top and bottom strut for biasing each adjacent top and bottom strut away from each other as the pairs of struts are moved in a direction opposite to their folding direction. One of the pairs of struts define slits for the reception of a paper sheet to be punched.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.