Device for holding precious stones during cutting and polishing the facets thereof
US4221082A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 26, 1979 |
| Grant date | Sep 9, 1980 |
| Priority date | — |
| Expiry date | Jan 26, 1999 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB24B9/16
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A device for holding precious stones during cutting and polishing the facets thereof comprises a rod having a mounting tip at one end for mounting the stone, a positioning collar loosely received on the rod so as to be movable both axially and rotatably thereon and including a plurality of flat faces on its outer surface each adapted to be pressed against a locating surface of an aligning fixture for positioning the stone with respect to a cutting or polishing disc, an indexing collar having a plurality of indexing positions, and spring means for fixing the positioning collar to the indexing collar and the latter collar to the rod at desired preselected positions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.