Apparatus for making a drilled hole with an undercut
US5544989A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 29, 1994 |
| Grant date | Aug 13, 1996 |
| Priority date | — |
| Expiry date | Aug 29, 2014 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T408/93
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
The drilling apparatus for making a drilled hole with an undercut includes a drive device for rotating a hollow drilling shaft (3); a drill bit holder (23,38) held in the hollow drilling shaft (3); a drill bit (4,26) having a drilling head provided with laterally projecting cutting edges (25) projecting from the drill bit holder (23,38); a device for swivelling out the drill bit holder (23, 38) with the drill bit from a drilling center line (5) including at least one control element of the drill bit holder, a sliding sleeve (11) surrounding the drilling shaft (3) and a swivelling-out element (21,39) connected to the movable sliding sleeve and engaging the control element to swivel out the drill bit holder (23, 38); and a device for raising and lowering the drive device (2) together with the drill bit holder (23,38) and the drill bit (4,26). In one embodiment the swivelling-out element is a sliding block and the control element is a cam surface in a slot provided in the drill bit holder.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.