Patent ID: 6300582
Filing Date: 2001-10-09
Classification: H01H

Abstract:
A dust and liquid resistant keyswitch assembly disposed upon a circuit board comprising:(a) a base plate including at least one stage support member, said stage support member having a substantially tubular lower portion and a substantially tubular upper portion extending axially therefrom, said lower and upper portions being joined by a step portion extending radially therebetween, said lower and upper portions each defining respective inner surfaces;(b) a key cap displaceably coupled to said stage support member, said key cap including a top portion and a plunger portion projecting longitudinally therefrom, said plunger portion extending coaxially through and slidably engaging said inner surface of said stage support member upper portion to be displaceable between released and pressed positions, said plunger portion in said released position retentively engaging said step portion of said stage support member and in said pressed position extending axially through said lower portion of said stage support member for contacting the circuit board; and(c) an elastic member elastically disposed between said top portion of said key cap and said step portion of said stage support member to encircle at least a portion of said key cap plunger portion.