Threaded coupling
US4861209A · kind A · utility
10Cited by
4References
5Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 14, 1987 |
| Grant date | Aug 29, 1989 |
| Priority date | — |
| Expiry date | Jul 14, 2007 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T403/5746
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A threaded coupling for a high frequency percussion drill assembly comprises a rod and a sleeve having external and internal threads, respectively. The threads are of the asymmetrical type and make contact along opposing shoulder portions disposed on only one side of each crown portion. The threads have a maximum diameter from 30 to 40 mm, a pitch of 7 to 11 mm, and a height from 1.2 to 1.6 mm. The parts of the root and crown portions located immediate adjacent the contacting shoulder portions have radii from 3 to 5 mm.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.