Compound screwdriver head
US7322265B2 · kind B2 · utility
6Cited by
10References
19Claims
0Family size
Inventor
Key dates
| Filing date | Jan 9, 2006 |
| Grant date | Jan 29, 2008 |
| Priority date | — |
| Expiry date | Apr 15, 2026 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB25B15/005
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A compound screwdriver head, which comprises a first working portion and a second working portion of the same size, the first, second working portion of the bigger size is used for screwing and unscrewing a bolt of bigger, smaller size respectively, so that different sizes of bolts can be locked and unloaded by one screwdriver. Thereby this invention is not only can save the structure of the bolt, but also can prolong the life of the bolt.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.