Device for protecting threadings and butt-type joint bearing surfaces of metallic tubes
US4796668A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 18, 1985 |
| Grant date | Jan 10, 1989 |
| Priority date | — |
| Expiry date | Jul 18, 2005 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16L57/005
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
A device for protecting, before use, threadings and butt-type joint bearing surfaces (66) which contribute to the hermetic character and to the threadings (55) of male or female joining regions of metallic tubes. It comprises a ring (56) of plastics material which is screwed onto the threading (55) of the metallic tube (54). A first lip (63) rests in a resilient tight manner on the joint bearing surface (66) in the vicinity of the inner edge (65) thereof. A closed annular volume (67) protects the bearing surface of the joint. A second lip (59) protects the threaded region. This device is used in particular for the frustoconical joint bearing surfaces of tubes with a frustoconical threading. The ring can be clothed by a metallic reinforcing sleeve (68).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.