| 摘要 |
PURPOSE:To suppress a swelling at both sides of a needle by drive-in forming a spring seat with a press after making a hole to the needle where the spring seat is drive-in formed from the driving-in side. CONSTITUTION:A penetrating hole 24 made at the center of a needle 4A beforehand prior to press-processing a spring seat 21A is made in a diameter smaller than that of the spring seat 21A. Consequently, when a press 23 is driven in the needle 4A, the deformation of the needle 4A portion is absorbed as a swelling 403A in the penetrating hole 24. As a result, a swelling at both sides of the needle 4A can be prevented or suppressed. Moreover, by providing the penetrating hole 24, a separation spring 8 can be set from the upper side by inserting a rod-form tool through the penetrating hole 24, and the workability is improved.
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