Keycap overlay snap-on system

A system for converting the graphic symbols on a computer data entry keyboard to another set of graphic symbols such as another language of scientific symbols, the data entry keyboard having a plurality of data entry keys, said data entry keys having an upper exterior rectangular surface and downwardly extending sides, comprising in combination:

• a plurality of keycaps, each keycap being adapted for positioning over the upper exterior surface of a data entry key on the computer data entry keyboard and adjacent to the downwardly extending sides of the data entry key, and having a top rectangular surface corresponding in size and shape to the upper exterior surface of the data entry key over which it is to be positioned, and further having a plurality of sidewalls extending downwardly and flared outwardly from the top rectangular surface for mateable receiving the adjacent sides of the data entry key to be covered, and a rim outwardly depending peripherally at a lower edge of the sidewalls, the rim having a plurality of lugs positioned midway on an inner edge thereof, for contacting the data entry key and further for separating an inner surface of the sidewall from the data entry key, each keycap having formed on the top rectangular surface thereof a first indicia corresponding to the graphic symbol to be displayed upon the striking of the data entry key, and still further having a second indicia on an interior surface thereof, the second indicia corresponding to the graphic symbol on the upper surface of the data entry key;
• a cabinet having a size and shape adapted to receive the plurality of keycaps that are in a stacked relationship and an open top end for receiving the stacked keycaps;
• and
• a lid for protecting the plurality of stacked keycaps when stored in the cabinet, the lid being sized to overlap a plurality of sidewalls of the cabinet and having an interior surface adapted to engage an upper edge of the cabinet.