| 摘要 |
PROBLEM TO BE SOLVED: To attain reduction in cost, simplification and reduction in height while keeping a nonlinear keying sense by adding energizing force which corresponds to the displacement of a sliding part to be engaged with one of a key top and a base in a direction different from the raising and lowering of at least one elastic member by a pair of link member for guiding and supporting the key top raising and lowering, accompanied by opening and closing of the contact of an electric circuit. SOLUTION: A pair of pivotal parts 24, 28 having bearing holes 24a, 28a and a pair of sliding engaging parts 26, 30 having bearing grooves 26a, 30a are formed on an inner surface 12b of a key top 12 and the opening inner edge part 14b of a base 14. Support shafts 38 on one-side ends of two arms 32 of first and second link members 16, 18 connected in X-shaped and rotatable about a pivotal shaft 40 are fitted to the bearing hole 24a and the bearing groove 26a, and support shafts 36 on both sides of a connecting bar 34 are fitted to the bearing hole 28a and the bearing groove 30a. A plate spring 48 stationarily connected fixedly to an inner edge part 14c of the base 14 and existing between it and the first link member 16 energizes the key top 12 leaving upward, and a dome-like elastic operating member is dispensed with.
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