Portable variable angle drilling machine
US4441564A · kind A · utility
11Cited by
8References
3Claims
0Family size
Inventor
Key dates
| Filing date | Jul 27, 1981 |
| Grant date | Apr 10, 1984 |
| Priority date | — |
| Expiry date | Jul 27, 2001 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B7/02
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A hole drilling machine which includes a geared stationary drill frame with a guide track to which support legs are attached at either end. A drive shaft made of hollow flexible tubing driven by a motor suspended from the guide track. An adjustable swivel axel to which the drill end is mounted. The drill end is a hollow tube with openings in an end to permit streams of water to wash loose soil out of the hole and assist in the drilling process and a helical knife edge attached thereto. An angled metal piece with exit holes to permit the flow of water is attached to the working end.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.