| 摘要 |
PROBLEM TO BE SOLVED: To prevent a fatigue disconnection of a wire material caused by floating and to realize a long life by using a twisted copper wire or braided copper wire for a short-circuiting wire material for connecting a movable T-formed contact piece to a supporting piece, laying the wire material in parallel to a short piece of the movable contact piece at the nearest part of the abutting part of the movable contact piece on the supporting piece and spot-welding one end of the wire material. SOLUTION: A wire material 50 comprising a soft twisted copper wire is layed in parallel to a short piece 33 of a movable contact piece 30 at an approximately nearest part of the abutting part 34 of the movable contact piece 30 on an abutting part 41 of a movable contact piece-supporting piece 40 and an end 51 of the wire material 50 is spot-welded to the movable contact piece 30. The wire material 50 is layed in parallel to a longitudinal side 43 of the movable contact piece-supporting piece 40 and an end 52 is spot-welded to the supporting piece 40. Thus, the floating of the wire material 50 by an opening/closing action of a power switch and a generation of a fatigue disconnection are suppressed to enhance a durability by short-circuiting both pieces at the nearest part of the abutting part of the movable contact piece 30 and the supporting piece 40 with the wire material 50 of a soft twisted copper wire or a braided copper wire having a durability. The wire material 50 can bear even against one hundred thousand times or more of opening/closing actions.
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