Rotary hammer with variable hammering stroke
US5036925A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 22, 1989 |
| Grant date | Aug 6, 1991 |
| Priority date | — |
| Expiry date | Aug 22, 2009 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB25D2250/191
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A rotary hammer has a pneumatic hammering mechanism driven by a wobble plate drive arrangement. A rotatably driven intermediate shaft transmits torque for rotating a tool holder. A carrier sleeve is rotatably mounted on the intermediate shaft and is elastically coupled with the intermediate shaft for limited rotational displacement relative thereto. The tool holder is rotatably driven via gearing by the carrier sleeve. On a suitable portion of the carrier sleeve a hub body of the wobble plate drive is mounted so as to be rotatable relative to the carrier sleeve but non-rotatable in relation to the intermediate shaft. In use, when a hammer bit in the tool holder is placed under load, the carrier sleeve and the intermediate shaft are caused to rotationally displace relative to each other as a result of the elastic coupling, wherein the inclination of the hub body of the wobble plate drive alters and with this the hammering stroke is altered.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.