Patent ID: 6194677
Filing Date: 2001-02-27
Classification: H01H

Abstract:
A keyswitch apparatus comprising:(a) a keytop having formed thereon at least one first retaining plate and at least one second retaining plate;(b) a circuit base having formed therein at least one first through hole and at least one second through hole, said circuit base having a first retaining body extending over said at least one first through hole and a second retaining body extending over said at least one second through hole;(c) a resilient dome disposed over said circuit base for selective electrical coupling thereto; and,(d) a supporting lever assembly for displaceably supporting said keytop over said circuit base and said resilient dome, said supporting lever assembly including:(1) a first lever having distal sliding and rotating portions, said sliding portion slidably engaging said first retaining body of said circuit base, said rotating portion pivotally engaging said first retaining plate of said keytop, said sliding portion having formed thereon a pair of laterally spaced clamping blocks and a sliding shaft axially extending therebetween, each of said clamping blocks defining outer and bottom surfaces adjoined by a tapered edge extending laterally adjacent an axial direction defined by said sliding shaft, said sliding shaft being disposed in sufficiently recessed manner relative to said clamping blocks to extend into said at least one first through hole of said circuit base; and,(2) a second lever intermediately coupled in pivotal manner to said first lever, said second lever having distal sliding and rotating portions, said second lever sliding portion slidably engaging said second retaining plate of said keytop, said second lever rotating portion having formed thereon a pair of laterally projecting rotational shafts each pivotally engaging said at least one second retaining body of said circuit base, each of said rotational shafts extending into said at least one second through hole of said circuit base.