Method of making a polytetrafluoroethylene hydrodynamic seal
US4450614A · kind A · utility
6Cited by
3References
6Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Feb 19, 1982 |
| Grant date | May 29, 1984 |
| Priority date | — |
| Expiry date | Feb 19, 2002 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/49918
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
The disclosure relates to a method of manufacturing an oil seal element from polytetrafluoroethylene and the like. A tubular billet having concentric inner and outer cylindrical surfaces is faced off at one end. An arcuate slit is cut in the end face of the billet at each of a plurality of angularly spaced positions. Indexing of the billet is synchronized with rotation of the slitting tool. A disk of desired thickness having arcuate slits on one of its faces is then sliced from the billet, thereby also facing the billet for the next slitting sequence.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.