Miniaturized calculator keyboard switch assembly having universally pivoted key actuators

Claim 1

A portable electronic calculator comprising: a body; a keyboard consisting of a plurality of keys housed in said body and exposed to the outside of said body through openings formed in the body, the keys of said keyboard being aligned with one another in a single row; an indicator for displaying the result of a calculation; said indicator being housed in the body and exposed to the outside of said body through an elongated opening formed in said body, said elongated indicator opening being disposed in alignment with said single row of keys; said keyboard including a plurality of resilient members each of which is retained at one end thereof by an engaging portion formed on the inside of one of said keys respectively, each of said resilient members being secured at its other end to a stationary portion of said body, each of said keys being normally held in a predetermined neutral position by its associated resilient member and being adapted to be tilted forwardly, backwardly, to the right, and to the left when the key is so depressed by the finger tip of a user on the front surface of the key; said keyboard further including a set of four make-and-break contacts housed in the body in opposing relation to the inside of each of said keys, different ones of said contacts being selectively actuated in accordance with the direction of tilting of the key when the key is tilted; an integrated calculator circuit housed in said body for receiving a signal based on the operation of each of the make-and-break contacts by the key operation to perform a calculation and to supply the result of the calculation to said indicator for viewing by the user through said elongated indicator opening; and a power source housed in said body for supplying power to said integrated calculator circuit and to said indicator.