Interchangeable conveying spiral for rock drills
US4699226A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 12, 1986 |
| Grant date | Oct 13, 1987 |
| Priority date | — |
| Expiry date | May 12, 2006 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B17/22
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
An interchangeable conveying spiral which can be removably, slidably mounted on a drill shaft for conveying drillings away from a drill head mounted on the end of the spiral. The spiral includes an elongated strip having at least first and second substantially orthogonal webs. The first web has a free, squared-off end. The strip is wound in a spiral with the free, squared-off end of one turn abuting the free, squared-off end of an adjoining turn of the spiral so that the first web forms a closed jacket tube which can be removably, slidably mounted on a drill shaft, and the second web serves exclusively as a transporting shoulder for conveying drillings.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.