includes an outer frame member which forms an air chamber extending around the perimeter of a raised keyboard thereby preventing any liquid spilled on the keyboard from reaching the interior elements of the keyboard the frame member is easily removable from the keyboard allowing the interior elements to be replaced or exchanged in accordance with the business environment in which the terminal device is to be used application_number US 40854382 A description referring now to fig1 there is shown an exploded view of a keyboard assembly associated with a data terminal device not shown in a manner that is well known in the art included in the keyboard assembly is a flat supporting member 20 which is normally located in the top surface of the terminal device the supporting member 20 includes a flat surface 22 having a centrally located raised supporting portion 24 which includes a circumferentially extending sidewall 26 and an upper flat surface 28 oppositely located at the peripheral edge of the upper surface 28 are a plurality of mounting apertures 30 which are used to secure a cover assembly to the raised supporting portion 24 in a manner to be described more fully hereinafter associated with the raised supporting portion 24 is a flat membrane type keyboard member 32 of standard construction an example of such a construction may be found in the previously cited u s pat no 4 006 850 which discloses a keyboard member comprising an upper flexible membrane having a plurality of key locations which when depressed will actuate a switch matrix portion.