| 摘要 |
PURPOSE:To make possible to simply press-fit a socket, by plastically deforming the cylindrical opening end side part of an upper sheet into a spherical shape in the inner peripheral direction with the use of a predetermined jig so that the above-mentioned opening side has a diameter which is less than the opening diameter of hollow section of a socket. CONSTITUTION:An upper sheet 7 adapted to be fitted in a socket 2 has one end formed in a cylindrical shape and a part axially extending in a predetermined length from its cylindrical opening end, which serves as a press-fit section 14 subjected to deformation in conformity with the spherical section 4 of a ball stud 1. The press-fit section 14 is plastically deformed into a spherical shape before a lower sheet 8 and the ball stud 1 are assembled to the upper sheet 7. That is, the press-fit section 14 is drawn into the spherical surface 20 side of a jig 19, being guided by the chamfered section of the jig 19, until it abuts against the stopper surface 22 of the jig 19, thereby it is plastically deformed into the spherical shape. In this case, the fabricated amount of the upper sheet 7 is such a degree that it may be fitted therein with the lower sheet 8 and the spherical section of the ball stud 1.
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