| 摘要 |
PROBLEM TO BE SOLVED: To give a satisfactory sense of click without inclining and displacing an operation plunger 3, if subjected to single-side depression. SOLUTION: With first and second rectangular levers 12, 13 having first - fourth arm portions 12-1 through 12-4, 13-1 through 13-4 alternately combined, an operation plunger 3 is fitted and connected to the third arm portions 12-3, 13-3 of both levers 12, 13 to form a parallel motion mechanism for moving up and down the third arm portions 12-3, 13-3 being kept in parallel to the first arm portions 12-1, 13-1 held by a base member 8. A wire resilient spring 15 is laid between the third arm portion 12-3 of the first lever 12 and the first arm portion 13-1 of the second lever 13 to give a clicking feel.
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