| 摘要 |
PROBLEM TO BE SOLVED: To provide a height adjustment nut which can prevent any idling of the height adjustment nut, and easily assemble the height adjustment nut to a bottom plate. SOLUTION: A part 23c to be caulked is inserted in an insertion hole 22h in a lower plate 22 from a lower side, a flanged part 23d is abutted on a lower side of the lower plate 22, the part 23c protruded upwardly from the insertion hole 22h is caulked from an upper side, and a circumferential part of the insertion hole 22h in the lower plate 22 is firmly held between a caulked part 23f and the flanged part 23d to fix the height adjustment nut 23 to the lower plate 22 side. Then, an upper insertion part 23b is inserted in an insertion hole 12e in an upper plate 21 from a lower side, and the upper plate 21 and the lower plate 22 are coupled with each other to dispose the height adjustment nut 23 on a bottom plate BP, and the idling of the height adjustment nut 23 can be prevented by the holding.
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