Importance

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Abstract

A key underboard structure adapted to be used in a computer key board assembly having a plurality of movable keys, includes a lower board and an upper board connected together by means of bayonet engagement to sandwich therebetween a rubber pad with an electrical circuit board having a plurality of contacts corresponding to the keys interposed between the rubber pad the lower board. The rubber pad having a plurality of resilient caps received and extending through holes formed on the upper board and to each contain therein a contact pad. A driving device is constituted by a first member having one end pivoted to the upper board to overlap a second member which has an opposite end movably and rotatably received within an L-shaped member formed on the upper board. The second member has an opening to allow the first member to extend therethrough and define a pivotal connection therebetween so as to allow the driving device to be movable between an expanded, cross configuration condition to rest on the cap and a collapsed, overlapped configuration condition so that when the key is depressed, the driving device changes from the expanded condition to the collapsed condition to deform the cap from an un-deformed configuration to a depressed configuration to bring the contact pad disposed therein into contact with the associated contact of the circuit board.

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First Claim