Abstract: A keyboard pushbutton apparatus is provided. The apparatus includes a stationary base and a movable cap coupled in axially displaceable manner thereto. The base is formed with an upwardly, extending section within which are disposed at least a pair of wedge members. The cap is formed with a downwardly extending guide post that slidably engages the upwardly extending section of the base. The guide post includes at least a pair of opposed resiliently deflective panels, each formed with a pair of axially directed ribs protruding transversely therefrom. The ribs are laterally spaced to define therebetween a slot for slidably engaging one of the base wedge members. A lower portion of at least one of the ribs includes a transversely directed oblique face for engaging a first surface of the wedge member, and a laterally directed oblique face for engaging a second surfaces of the wedge member.

Abstract: A keyboard pushbutton includes a stationary base forming an upward-extending silo having a rectangular cross section having four corners. Two wedge blocks are formed on an inside surface of the silo and are opposite to each other. A movable cap forms a depending guide post movably received in the silo whereby the cap is movable with respect to the base between a released position and a depressed position. The guide post forms two panels each defining two slits for making the panel resiliently deflectable. Each panel forms a slot defined between two ribs for movably receiving the corresponding wedge block. The ribs converge toward each other at a free end of the panel and the converging configuration of the ribs is complementary to the shape of the wedge block for effectively preventing the cap from separating from the base and slowing down the moving speed of the cap when the cap is forcibly returned back from the depressed position to the released position so as to reduce the noise caused thereby.

Abstract: The present invention relates to lighting unit that comprises at least a trough, a plurality of slots on a light penetration member attached at the bottom of a base, and at least a LED disposed in the trough. Fasteners are attached to the end of the feet of each key to join the key to the slots on the light penetration member. Each key is capable to move up and down freely with respect to the base. The LED connects to a power supply, the LED lights. All relevant keys will have an appropriate luminosity.