Clamping device
US6988720B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jan 23, 2003 |
| Grant date | Jan 24, 2006 |
| Priority date | — |
| Expiry date | Jan 23, 2023 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB23B31/402
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A clamping device 2 is provided with a hydraulic cylinder 7 for biasing a collet member 5 upward via a collet supporting member 6 and driving a pull rod 4 downward. A piston member 30 has a greater pressure receiving area than the collet supporting member 6 in the circular hydraulic chamber 31 of the hydraulic cylinder 7. Therefore, the hydraulic cylinder 7 can drive the pull rod 4 downward while the collet member 5 is biased upward. Meanwhile, the collet 5a of the collet member 5 is resiliently deformed in a diametrically expanding manner to engage in the vertical bore 1b of a workpiece 1 while slightly moving downward, ensuring a secure locking of the workpiece 1 to a workpiece receiving surface 3a.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.