Pushbutton dials

A pushbutton dial comprising:

• a cover having a plurality of apertures therein, said apertures arranged in columns and rows;
• a pushbutton in each aperture, each pushbutton having an upper portion, a base portion and a flange extending peripherally of the pushbutton at the junction of said upper and base portions, said upper portion a sliding fit in said aperture and guided thereby;
• a series of longitudinal shafts pivotally supported on the back surface of the cover, a longitudinal shaft related to each column of apertures;
• a series of transverse shafts pivotally supported on the back surface of the cover, a transverse shaft related to each row of apertures;
• each of said longitudinal and transverse shafts having a plurality of levers positioned to be engaged by said flanges on said pushbuttons, a lever on a longitudinal shaft and a lever on a transverse shaft associated with each flange;
• an extension on one end of each longitudinal shaft and each transverse shaft, said extensions alternating at said ends of said shafts;
• a back member mounted on and spaced from the back surface of said cover;
• spring means positioned between each pushbutton and said back member and biasing said pushbutton away from said back member, said flange limiting movement of said pushbutton away from said back member;
• a plurality of bushes in said back member adjacent to the periphery thereof, a bush aligned with each of said extensions on said shafts;
• a pin axially slidable in each bush, each pin in engagement at a forward end with one of said extensions on said shafts;
• a circuit member mounted on and spaced from the back surface of said back member;
• a plurality of pairs of spring contacts mounted on the back surface of said circuit member adjacent the periphery thereof, a pair of contacts associated with each bush and related pin;
• said pins extending through holes in said circuit member, a rearward end of each pin in engagement with a contact of one of said pairs of spring contacts.