Patent ID: 6072134
Filing Date: 2000-06-06
Classification: H01H

Abstract:
A key switch device including:a key top having a back surface, the key top being provided with a first engagement portion and a second engagement portion on the back surface;a base plate provided with a third engagement portion corresponding to the first engagement portion of the key top and a fourth engagement portion corresponding to the second engagement portion of the key top;a guide support member for guiding vertical movement of the key top, the guide support member being disposed between the key top and the base plate and constructed of a first and second link members mutually movably arranged, the first link member being provided with a first shaft engaged in the first engagement portion and a fourth shaft engaged in the fourth engagement portion, and the second link member being provided with a second shaft engaged in the second engagement portion and a third shaft engaged in the third engagement portion;a first shoulder portion formed close to the fourth shaft in the first link member, the first shoulder portion being recessed inwardly from a lower end surface of the fourth shaft and held in contact with an upper surface of the base plate;a second shoulder portion formed close to the third shaft in the second link member, the second shoulder portion being recessed inwardly from a lower end surface of the third shaft and held in contact with the upper surface of the base plate; anda switching member which performs a switching operation in response to the vertical movement of the key top.