Secrecy cover for key pad matrix

A secrecy cover for use on a square key matrix type key pad having a 3×4 matrix of similar pressure depressible keys, the secrecy cover having manually manipultable operating mechanism to interface with the key pad for secret entry of data into the key pad in a visually observable area, comprising in combination:

• an open bottom generally rectilinear casement having similar opposed sides, a top, a bottom and a face extending therebetween to define a medial cavity to fit over and cover a 3×3 square matrix array of key pad keys having a medial laterally extending row and a medial vertically extending column of keys;
• three operator keys movably carried by the casement to extend from the medial cavity, through the face and spacedly therefrom lineal array parallel to the casement sides, said operator keys arrayed vertically adjacent to three keys of the medial column of the 3×3 matrix of key pad keys covered by the secrecy cover;
• three elongate operator bars carried by the casement sides for slidable motion toward and away from the face and extending perpendicularly to the lineally arrayed operator keys, with one operator bar adjacent each operator key for movement toward and away from the face responsive to motion of the associated operator key;
• and
• a key depressor carried by each operator bar and within the medial cavity for slidable motion between three predetermined positions and extending distally from the casement face to selectively depress one of three key pad keys adjacent the operator bar responsive to the associated operator key motion.

A secrecy cover for use on a square key matrix type key pad having a 3×4 matrix of similar pressure depressible keys, the secrecy cover having manually manipulable operating mechanism to interface with the key pad for secret entry of data into the key pad in visually observable area, comprising in combination:

• an open bottom generally rectilinear casement having similar opposed sides, a top, a bottom and a face extending therebetween to define a medial cavity to fit over and cover a 3×3 square matrix array of key pad keys having a medial laterally extending row and a medial vertically extending column of keys;
• three operator keys movably carried by the casement to extend
• from the medial cavity, through the face and spacedly therefrom in lineal array parallel to the casement sides, said operator keys arrayed vertically adjacent to three keys of the medial column of the 3×3 matrix of key pad keys covered by the secrecy cover;
• three operator bars carried by the casement sides for pivotal motion toward and away from the face and extending perpendicularly to the lineal array of operator keys and spacedly inwardly from each operator key with one operator bar adjacent each operator key for pivotal movement toward and away from the face responsive to motion of the associated operator key;
• a key depressor carried by each operator bar and within the medial cavity for slidable motion between three predeterminable positions and extending distally from the casement face to selectively depress one of three key pad keys adjacent the operator bar responsive to the associated operator key motion.

A secrecy cover for a matrix type key pad having a 3×4 matrix of elongate pressure depressible keys with lateral length greater than perpendicular width, the secrecy cover having manually manipulable operating mechanism to interface with the key pad for secret data entry into the key pad in a visually observable area said secrecy cover and alignment structure, comprising in combination:

• an open bottom generally rectilinear casement formed by two similar opposed sides, a top, a bottom and a face extending therebetween to define a medial cavity to fit over and cover a 3×3 square matrix array having laterally extending rows and perpendicular vertically extending columns of elongate key pad keys, said casement having
• alignment ledges carried by both sides, the top and the bottom distally from the face to extend into the medial cavity equal distances that are incrementally distant from the distal edges of the opposed vertical columns of the covered 3×3 matrix of elongate key pad keys to horizontally align the casement on the covered matrix of elongate keys, and
• at least two spaced alignment arms extending spacedly inwardly into the medial cavity from each alignment ledge incrementally distant from the distal edges of the opposed horizontal rows of the covered 3×3 matrix of elongate key pad keys to vertically align the casement on the covered matrix of key pad keys said alignment arms arrayed to extend between horizontal rows of key-pad keys.