| 摘要 |
PROBLEM TO BE SOLVED: To horizontally hold finger contact pieces, prevent defective contact with a pinched contact piece due to vibration, and maintain the good contact state by suppressing the rotation of the finger contact pieces in the vertical direction around carriers. SOLUTION: A pair of finger contact pieces 29 having a U-shaped cross section are fitted to carriers 17 erected on both sides of the tip section of a blade 7a rotatably in the horizontal direction around the carriers 17, and the finger contact pieces 29 are electrically connected to the blade 7a via connecting conductors 25 fitted to their base end sections. When a pinched contact piece 6b expands the tip sections of the finger contact pieces 29 of contact pieces 26a to rotate them in the opposite directions around the carriers 17 in a closing action, the contact pieces 6b, 29 are held at the proper contact pressure. Even if the blade 7 a is vertically moved by the vibration of an earthquake, the finger contact pieces 29 are not rotated in the vertical direction, and the contact between the contact pieces 6b, 29 is satisfactorily maintained. |
