Telescopically extensible drill
US5168944A · kind A · utility
8Cited by
7References
10Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 6, 1991 |
| Grant date | Dec 8, 1992 |
| Priority date | — |
| Expiry date | Jun 6, 2011 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B17/07
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A telescopically extensible drill comprises a drill barrel, a drill bit connected to the barrel, and a drill rod which can be displaced between two longitudinally spaced positions in relation to the drill barrel, and secured in either of those positions. The drill can thus be extended in length without having to splice additional barrels or rods to the drill.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.