Ratchet driver
US4086831A · kind A · utility
14Cited by
4References
7Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jan 28, 1977 |
| Grant date | May 2, 1978 |
| Priority date | — |
| Expiry date | Jan 28, 1997 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB25G1/085
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A screwdriver including a relatively large teardrop-shaped, hollow handle, comfortable to the hand for delivering increased turning power, is provided with a self-contained ratchet mechanism which, in turn, has a three-position ratchet control (forward, reverse and lock). The shank of the screwdriver houses a magnet for releasably holding any one of a number of bits in place during use. The handle has a series of finger-engageable projections on its stem to assist the operator in applying torque and for storage of bits therein. A retainer ring on the stem holds the bits in the chambers until indexed to a bit-releasing position.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.