Hammer drill with a mode change-over mechanism
US5842527A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 15, 1996 |
| Grant date | Dec 1, 1998 |
| Priority date | — |
| Expiry date | Aug 15, 2016 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB25D16/006
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A hammer drill has a mode change-over mechanism including a change link with a horizontally elongated slot, an eccentric pin projecting from a mode selector switch and penetrating the slot. The change link is moved vertically by rotating the mode selector switch, which in turn vertically moves a pair of change keys secured to a holder of the change link, thus either engaging or disengaging the change keys with or from a sleeve provided in a rotation transmission mechanism for transmitting the rotation of a motor to the tool holder. In the engagement position, the rotation of the motor of the hammer drill is transmitted to a tool holder while in the disengagement position, the rotation of the motor is not transmitted. Also, the eccentric pin is engaged with a square recess formed in a lock ring which is fitted around the tool holder and urged backward by a compression spring. The eccentric pin is horizontally moved by rotating the mode selector switch, which in turn moves the lock ring in the axial direction, thereby couple or de-couple the lock ring to or from the tool holder.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.