| 摘要 |
PROBLEM TO BE SOLVED: To securely prevent a switch from malfunctioning even when a part, opposed to the middle between two adjacent switches, of an operation member is pressed.SOLUTION: Columnar stoppers 11A to 11D are extended downward from four places on a reverse surface of an operation member 1. The stoppers 11A to 11D are each arranged in the center between two adjacent switches among switches 4A to 4D. When one of operation positions 12A to 12D of the operation member 1 is pressed, tips of two stoppers across the pressed operation position among the stoppers 11A to 11D abut on a top surface of a base 3, and the operation member 1 swings until the switch positioned below the pressed operation position operates. When a part between two adjacent operation positions among the operation positions 12A to 12D is pressed, the tip of the stopper right below the pressed position abuts on the base 3 to restrict the swing of the operation member 1, and the two switches on both sides do not operate. |
