Effort-saving hand operated punching device
US8109189B2 · kind B2 · utility
1Cited by
2References
16Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 26, 2008 |
| Grant date | Feb 7, 2012 |
| Priority date | — |
| Expiry date | Apr 12, 2030 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T83/943
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A hole punching device includes two first punching members and a second punching member intermediate the two first punching members. First, second and third lever arms are adapted to render one of the two first punching members, another of the two first punching members and the second punching member to press holes in sheets respectively. The first lever arm has a longitudinal length longer than those of the second and third lever arms, with the second lever arm being longer than that of the third lever arm. Further, the first lever arm actuates the second and third lever arms upon depression of the hole punching device.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.