The disc (D) is supported on one pivot (14) in its stable positions and on both pivots (14, 15) in the intermediate position as the push button (B) slides on an axis perpendicular to the line of the supporting pivots. It acts alternately on the open and common contacts and the closed and common contacts. The contact pieces are U-shaped with the sides forming the contact points and the cross piece between the sides forming a connecting point for a terminal, although only the common piece uses both sides as contacts. The contact pieces are positioned through passages in the base (11) of the switch housing.
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