| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a spring hole structure and a fitting device with a rust proof function.SOLUTION: A spring hole 10 includes an opening 12 which is bored in a speaker holder 11 with a planar shape formed in a circle. The hole is formed having a prescribed height with respect to a front face of the speaker holder 11 with an approximately hollow cylindrical longitudinal section. Four ribs 13a, 13b, 13c and 13d are formed at intervals of 90 degrees on the inner wall of the hole. Height of respective ribs 13a-13d is arranged so that a spring does not contact with adjacent ribs of the ribs 13a-13d when the spring is inserted into the spring hole 10. Therefore, outer peripheral surface of the spring does not closely contact with the inner wall of the spring hole as before to be point/line contact so that moisture content kept by surface tension at a contact part or a peripheral part thereof between the outer peripheral surface of the inserted spring and an inner wall surface of the hole can be decreased, less likely to occur corrosion of the spring as a result.</p> |
