Patent ID: 6184481
Filing Date: 2001-02-06
Classification: G06F,H01H

Abstract:
A key switch of the type comprisinga key base,a respective conductive rubber cone received inside said key base at the bottom and supported on a circuit board and having a rectangular hole above said rubber cone,a plunger received inside said rectangular hole and having two spring strips respectively terminating in a respective hooked portion hooked on a respective retaining groove on said key base to limit the upward movement of said plunger within said key base, anda key cap fastened to said plunger and depressed to squeeze said plunger against said rubber cone causing it to trigger a respective electrical contact on said circuit board, whereinsaid plunger is made of a springy material and has a mounting slot at the top in the middle;said key cap has a hollow projecting rod on the inside fitted into said mounting slot causing said plunger to be fastened to said key cap;said spring strips are respectively integrally extended downward from two opposite sides of said plunger in the middle; andsaid plunger further comprises two longitudinal through holes on two opposite sides alongside said mounting slot, said longitudinal through holes each being substantially parallel to a side of said mounting slot.