Pushbutton of keyboard

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. Each wedge block forms a camming surface and the corresponding ribs form inclined lower ends cooperating with the camming surface for guiding the wedge block into the slot between the ribs. The guide post forms flanges coextensive therewith, each flange having a rounded free edge in physical engagement with the corresponding corner of the silo for guiding smooth movement of the guide post with respect to the silo.

Dependencies are inferred from the claim text.