Patent ID: 6040540
Filing Date: 2000-03-21
Classification: H01H

Abstract:
A key switch comprising:a base plate member having a lower pivot groove formed therein;a conductive membrane fixedly mounted on said base plate member;an elastic member;a key having an upper pivot groove and a pivot recess formed therein;a key support mechanism having first and second support levers, said first and second support levers being centrally pivotally mounted each to the other and having identical U-shaped structural contours, said first support lever forming first and second vertical shafts and having a first pivot shaft slidably mounted within said upper pivot groove of said key and having a first lateral shaft pivotally mounted within said lower pivot groove of said base plate member, said second support lever forming a third and a fourth vertical shaft and having a second pivot shaft pivotally secured within said pivot recess of said key, said pivot recess containing at least one-half of the length of said second pivot shaft, said pivot recess forming first and second walls, said first and second walls being contiguous with said second pivot shaft, said first wall having a hook formed thereon, said hook having a length greater than a radius of said second pivot shaft, said second wall having a thickness less than that of said first wall to allow for structural flexibility, said second support lever having a second lateral shaft in slidable electrical contact with said conductive member.