Joints and connections – Molded joint – Socket or open cup for bonding material
Patent
1987-06-15
1989-04-18
Kundrat, Andrew V.
Joints and connections
Molded joint
Socket or open cup for bonding material
403334, F16B 1100
Patent
active
048222011
ABSTRACT:
A sucker rod coupling pin comprises a hole into which the sucker rod is to be inserted, and has a plurality of annular depressions which surround the inner wall of the hole. As viewed crosswise, the annular depressions respectively have tapered surface portions arranged in series from the open end to the closed end of the coupling pin hole. The tapered surface portions whose cross sections progressively increase toward the closed end of the coupling pin hole have their respective lengths progressively shortened in relation to the preceding tapered portion, toward the closed end of the coupling pin hole, and the angle of inclination of the respective tapered surface portions progressively increases toward the closed end of the coupling pin hole.
REFERENCES:
patent: 4475839 (1984-10-01), Strandberg
patent: 4653953 (1987-03-01), Anderson et al.
patent: 4662774 (1987-05-01), Morrow, Jr.
Iwasaki Toshio
Katoh Akihiko
Murao Atsuhiko
Nakano Takashi
Nasu Masaru
Kundrat Andrew V.
Nippon Kokan Kabushiki Kaisha
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