Patent ID: 6057522
Filing Date: 2000-05-02
Classification: H01H

Abstract:
A keyswitch, comprising:a keycap;a switch element, responsive to the reciprocal movement of the keycap, for selectively being turned ON;a rubber sheet disposed on the switch element;a housing disposed on the rubber sheet, said housing having a pair of hook devices formed thereon to define slots and having openings formed at locations substantially under the respective slots; anda balance lever having a longitudinal portion connected to two traverse portions forming an ""U"" shape, wherein end terminals of the traverse portions are disposed within the respective slots;further wherein protrusions are formed on the rubber sheet at locations corresponding to the respective slots, said protrusions extending into the respective openings and contacting with the respective end terminals of the traverse portions of the balance lever to lower the noise generated during movement of the traverse portions.