| 摘要 |
PROBLEM TO BE SOLVED: To improve the appearance of the mounted state of joint pieces by efficiently carrying out the work for brazing the joint pieces to top and bottom end segments of eyewires. SOLUTION: The outer peripheral parts of the upper and lower joint pieces 6 and 7 are provided with fitting grooves 15 and 16. The inside surface sides of both the joint pieces 6 and 7 are provided with recessed parts 23, so as to be recessed on the peripheries at the edges of the fitting grooves 15 and 16. A spacing 38 is formed by matching of the recessed parts 23 and 23 between the edges of the fitting grooves 15 and 16, in a state of the inside surfaces of both joint pieces 6 and 7 being abutted against each other. When the top and bottom end segments of the eyewires are fitted into the upper and lower fitting grooves 15 and 16 and are brazed, the flow of the brazing filler metal made into a molten state on the one fitting groove side is shut off by the spacing 38, so as not to move to the other fitting groove side. The spacing 38 is covered and hidden by the end segments 3 and 5 and will not be exposed, in a state with the end segments of the eyewires being fitted into the fitting grooves 15 and 16.
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