Impact mechanism for a hammer drill
US5653294A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 6, 1996 |
| Grant date | Aug 5, 1997 |
| Priority date | — |
| Expiry date | Aug 6, 2016 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB25D11/106
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A hammer drill has a motor disposed in a housing, and the motor has a rotatable armature shaft. A pinion at an end of the armature shaft drives an axially displaceable intermediate gear mounted on an intermediate shaft. An intermediate pinion is mounted for rotation with the intermediate gear and drives an output gear fixed about the midsection of an axially displaceable output shaft. The intermediate gear has input and output faces. The input face is associated with a first cam mechanism for generating reciprocating motion. The output face is engageable with an impact face of the output gear to transmit axial displacement therebetween. A second cam mechanism is affixed to the housing and axially spaced from the first cam mechanism. The first and second cam mechanisms are engageable by sufficiently axially displacing the output shaft so that the output gear impact face abuts the intermediate gear output face axially displacing the intermediate gear so that the first and second cam mechanisms abut each other. The first and second cam mechanisms are configured with respect to each other to generate reciprocating motion and cause the intermediate gear to reciprocate axially as the fir…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.