Hammer drill
US4690226A · kind A · utility
10Cited by
3References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 12, 1986 |
| Grant date | Sep 1, 1987 |
| Priority date | — |
| Expiry date | May 12, 2006 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B1/30
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A hammer drill has clamping jaws which are provided, in addition to clamping surfaces for radial clamping a cylindrical tool shaft, also with additional axially extending guiding surfaces for axially non-rotatably holding and guiding of the tool shaft, and the tool shaft is provided with guiding grooves associated with the clamping jaws.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.