Device for protecting threadings and butt-type joint bearing surfaces of metallic tubes
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United States of America Patent
Stats
-
Jan 10, 1989
Grant Date -
N/A
app pub date -
Jul 18, 1985
filing date -
Jan 9, 1984
priority date (Note) -
Expired
status (Latency Note)
Importance
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).
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