Rotary hammer
US4895212A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 28, 1989 |
| Grant date | Jan 23, 1990 |
| Priority date | — |
| Expiry date | Feb 28, 2009 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB25D16/003
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A rotary hammer has a pneumatic hammer mechanism which can be driven by means of a driver-part mounted rotatably on an intermediate shaft, with which driver-part a first coupling element of a coupling is non-rotatably connected, while the second coupling element of the coupling is non-rotatably mounted on the intermediate shaft and through axial displacement can be brought into positive coupling engagement with the first coupling element. A synchronizing arrangement is provided, which on approach of the coupling elements to one another, accelerates the first coupling element at least approximately to the rotational speed of the second coupling element and only then permits the positive engagement of the coupling elements.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.