Drilling and/or percussion power tool
US6116352A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 4, 1999 |
| Grant date | Sep 12, 2000 |
| Priority date | — |
| Expiry date | Mar 4, 2019 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB25D2250/035
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A drilling and a percussion power tool and the tool holder, a housing, an air cushion percussion mechanism arranged in the housing and including a guiding tube, a piston reciprocating in the guiding tool, a striker reciprocating in the guiding tube, an air cushion chamber formed on the guiding tube between the striker and the piston, at least one control opening ventilating the air cushion chamber in an idling position of the percussion mechanism, a control part which in a percussion operation closes the at least one control opening for forming an air cushion in the air cushion chamber, and at least one additional opening formed in the guiding tube for ventilating of the air cushion chamber and arranged forwardly of the at least one control opening at a side of a tool so that in the percussion operation the at least one additional opening is covered by the striker.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.