F - Mech Eng,Light,Heat,Weapons – 16 – B
Patent
F - Mech Eng,Light,Heat,Weapons
16
B
103/142
F16B 11/00 (2006.01) E21B 17/04 (2006.01) F16B 13/14 (2006.01) F16B 13/00 (2006.01)
Patent
CA 1271087
Abstract of the Disclosure A sucker rod coupling pin defines 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 an- nular depressions respectively have tapered portions arranged in series from the open end to the closed end of the coupling hole, the tapered portion whose cross section progressively increases toward the closed end of the coupling hole has its length progressively shortened in relation to the preceding tapered portion, toward the closed end of the coupling hole, and the angle of inclination of the respective tapered portions progressively increase toward the closed end of the coupling hole.
539864
Iwasaki Toshio
Katoh Akihiko
Murao Atsuhiko
Nakano Takashi
Nasu Masaru
Iwasaki Toshio
Katoh Akihiko
Murao Atsuhiko
Nakano Takashi
Nasu Masaru
LandOfFree
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