Hand held drilling tool for removing spot welds
US4830550A · kind A · utility
3Cited by
3References
13Claims
0Family size
Inventor
Key dates
| Filing date | Oct 5, 1987 |
| Grant date | May 16, 1989 |
| Priority date | — |
| Expiry date | Oct 5, 2007 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T408/99
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A drilling tool for removing spot welds includes a central shaft having a threaded portion which extends through a center nut and washer assembly. A pair of oppositely opposed compression springs bear on the center nut and washer assembly to maintain it in a fixed position. Stops located on the shaft engage the center nut and washer assembly to limit the forward travel of the drill bit. This ensures that the drill bit has a predetermined stroke length. The springs provide compression for the drill bit as the shaft rotates thus forcing the drill bit into the workpiece, but with some resilience so that the drill does not bind up.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.