Pressure foot of printed circuit board drilling apparatus
US4915550A · kind A · utility
32Cited by
3References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 22, 1988 |
| Grant date | Apr 10, 1990 |
| Priority date | — |
| Expiry date | Dec 22, 2008 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T409/304088
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
In a pressure foot used in an apparatus for drilling printed circuit boards, which includes a bearing for holding a spindle, and formed at the end portion thereof with an inner void space having a bottom hole for passing the drill bit, the end portion of the pressure foot is provided with an annular end surface possibly contacting with the printed circuit board and air injection ports for injecting compressed air into the inner space. The air injection ports are so directed that the air flow from each injection port is tangently contacts with the circumferential surface of the drill.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.