Patent ID: 6550993
Filing Date: 2003-04-22
Classification: H01H

Abstract:
An improved keyboard structure comprising a lower plate, a membrane circuit, an upper plate, a bridge means, an elastic element and a key cap, wherein:the key cap is allowed to receive an external force for moving the bridge means downward to depress the elastic element and the membrane circuit to output a signal corresponding to the key cap; the lower plate has a set of symmetrical first latch sections and a set of retaining sections formed at selected locations corresponding to the first latch sections; and the upper plate has a set of symmetrical apertures corresponding to the first latch sections, a set of symmetrical second latch sections corresponding to the apertures, and openings in front of the second latch sections for housing the retaining sections; wherein the bridge means has a first pivotal end insertable in a bias manner into a space formed between the second latch section and the retaining sections, and a second pivotal end latching to the first latch sections such that the bridge means is assembled on the upper plate and the lower plate in a single direction; and the upper plate being movable to allow the second latch sections to separate from the first pivotal end for removing the bridge means.