Torque driving tool and retainer for driven member
US4970922A · kind A · utility
45Cited by
9References
20Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 1, 1990 |
| Grant date | Nov 20, 1990 |
| Priority date | — |
| Expiry date | Mar 1, 2010 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB25B15/005
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A rotatable driving tool for imparting torque to a driven member, such as a threaded fastener having an axial recess in the head thereof, comprises a circularly cylindrical body with a plurality of substantially circularly helical driving portions projecting laterally therefrom and equiangularly spaced about the cylindrical axis, each of the driving portions having a small helix angle, preferably between one and three degress. The driving portions mate with lobes of the fastener recess but are slightly inclined with respect thereto to provide a wedge fit to retain the fastener in engagement with the tool body.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.