Hammer drill
US5373905A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 8, 1993 |
| Grant date | Dec 20, 1994 |
| Priority date | — |
| Expiry date | Nov 8, 2013 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB25D2250/191
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A hammer drill has a three-part hammering sleeve. A hardened tool socket is attached to a guide tube made of unhardened steel by an axial connection. For connection to the driving gearwheel, the guide tube furthermore carries a latching ring fixed on the guide tube by three rollers which make possible good torque transmission. This construction has the advantage that it is no longer necessary to harden the entire hammering sleeve but only the tool socket and the latching ring. The guide tube can be composed of soft steel. The connections and ensure large-area transmission of force, wear on the soft guide tube caused by conventional connection techniques thereby being avoided.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.