| 摘要 |
PROBLEM TO BE SOLVED: To make structure simple, make size small and thin, prevent simultaneous operation of plural switches, and realize high reliability by installing a projection acting as a stopper by striking against a member placed in the displacement target when an operation lever is displaced on the lower surface of the intermediate part of each arm. SOLUTION: An operation lever 35 is pushed and falls, a projection 30 of the central lower surface of the operation lever 35 deforms a contact spring 29, bending of the contact spring 29 is reversed and comes in contact with a contact pattern on a circuit board 23, and a switch in the central part is closed. When the central part of the operation lever 35 is pushed and the operation lever 35 falls, the tip of each arm falls, but move falling down the tip of a mediation lever 32 with the projection on the tip lower surface of the arm is reduced to a half or less by the lever ratio of the mediation lever 32 in a portion of the projection on the lower surface of the mediation lever 32, deformation of the contact spring 29 pushed with the projection 33 is smaller than that of the contact spring 29 in the central part, and the bending part cannot come in contact with the contact pattern on the circuit board 23.
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