Combination screw-tapping and screwdriving tool
US4796319A · kind A · utility
14Cited by
9References
2Claims
0Family size
Inventor
Key dates
| Filing date | Jun 11, 1987 |
| Grant date | Jan 10, 1989 |
| Priority date | — |
| Expiry date | Jun 11, 2007 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T408/9065
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A drill accessory kit for mounting screw-type fasteners is comprised of several drill bit holders and a screwdriving attachment. The bit holder engages a common twist drill bit in the chuck of a drill and allows one to drill a pilot hole to a desired depth in a workpiece with a cutting action which provides a proper-shaped hole for clean flush mounting or countersinking of a screw. Subsequently, the screwdriver attachment slips over the drill bit and engages with the bit holder, allowing a quick change from drilling to powerdriving of a screw.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.