US Patent: 4,970,922
|
| Torque Driving Tool and Retainer for Driven Member
|
|
Patentee:
|
|
| Bert Krivec (exact or similar names) - Waukesha, WI |
| Manufacturer: |
| Not known to have been produced |
|
|
Patent Dates:
|
| Applied: |
Mar. 01, 1990 |
| Granted: |
Nov. 20, 1990 |
USPTO (New site tip)
Google Patents
Report data errors or omissions to steward
Stan Schulz
Snap-On Tools Company History
|
|
Description: |
| Emrich & Dithmar - patent attorneys
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.
|
|
