Patent ID: 6156986
Filing Date: 2000-12-05
Classification: H01H

Abstract:
A computer key switch comprising a frame, a membrane circuit mounted on said membrane, a key switch base mounted on said membrane circuit, a rubber cone supported on said membrane circuit inside said key switch base, and a key cap coupled to said key switch base for depressing by hand to compress said rubber cone in triggering said membrane circuit to output a signal, wherein said key cap comprises a downwardly extended plunger of H-shaped cross section, and two symmetrical hook rods, said plunger comprising eight longitudinally extended guide ribs formed integral with the periphery thereof and disposed in contact with an inside wall of said key switch base for enabling said key cap to be moved up and down relative to said key switch base; said key switch base is a hollow shell comprising an upper frame board, and a bottom frame board, said upper frame board being a hollow, rectangular structure in which the plunger of said key cap is moved up and down with said key cap, an inside wall disposed in contact with the guide rids of the plunger of said key cap, and two hooks formed integral with said inside wall at two opposite sides corresponding to said hook rods to limit up stroke of said key cap; said rubber cone is mounted inside said bottom frame board and supported on said membrane circuit above said frame, comprising a top bearing portion, which supports the plunger of said key cap, and a triggering rod suspended on the inside and spaced above said membrane circuit for triggering a contact at said membrane circuit upon down stroke of said key cap.