Multiple push button electrical switch apparatus

Claim 1

A MULTIPLE PUSH BUTTON SWITCH APPARATUS FOR PREVENTING PRESELECTED ELECTRICAL CIRCUITS FROM BEING CONNECTED, COMPRISING: A RIGID FRAME, A PLURALITY OF LONGITUDINALLY MOVABLE PUSH BUTTON-TYPE PLUNGERS PARALLEL ALIGNED IN TWO ROWS SLIDABLY MOUNTED IN SAID FRAME INCLUDING MEANS FOR ACTUATING THE ARMATURES OF SEPARATE ELECTRIC SWITCHES, OBSTRUCTING MEANS FORMED ON EACH OF SAID PLUNGERS ALONG THE LENGTH THEREOF AND EXTENDING TOWARD THE ROW OPPOSITE THEREOF FOR PREVENTING MOVEMENT OF SAID PLUNGERS, AND A LOCK-OUT BEAM PIVOTALLY CONNECTED AT THE ENDS THEREOF TO SAID FRAME BETWEEN SAID ROWS OF PLUNGERS AND NESTED UNDERNEATH SAID OBSTRUCTING MEANS, SAID BEAM HAVING THE SIDE EDGES THEREOF INDENTED AT PREDETERMINED INTERVALS ALONG THE LENGTH THEREOF ADJACENT TO A PRESELECTED NUMBER OF SAID OBSTRUCTING MEANS; WHEREBY DEPRESSING ANY ONE PLUNGER IN EITHER OF SAID ROWS IMMOBILIZES CERTAIN PLUNGERS IN THE OTHER OF SAID ROWS.