| 摘要 |
PROBLEM TO BE SOLVED: To absorb misalignment thereby to secure certain seal at all time, by forming a pressed portion of a metal pipe to be spherical shape and disposing a collar formed to be such as a spherical shape between the pressed portion and a bottom portion of the ball head lock nut. SOLUTION: When a metal pipe 2 is connected to a mating part 1, an internal screw 3-1 of a ball lock nut 3 is screwed into an external screw 1-1 of the mating part 1 with a state where a pressing bearing surface 2-3 in a pressing head portion 2-2 of the metal pipe is come into contact with a pressed bearing surface 1-3 of the mating part 1. A recessed face 4-1 of a collar 4 presses a pressed portion 2-4 in the rear of the pressing head portion 2-2 so that the pressing bearing surface 2-3 is press-contacted to the pressed bearing face 1-3 to enable to obtain certain seal. At the time, even if a shaft center of the mating part 1 and that of the metal pipe 2 is deviated from each other, the collar 4 slides on a flat bottom portion 3-2 of the ball head lock nut 3 in a diameter direction, so that the pressing bearing surface 2-3 is properly press-contacted to the pressed bearing surface without eccentric touch.
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