Pump arrangement for dispensing predetermined quantities of liquid

Claim 1

IN A PUMP DRIVEN BY AN ELASTIC MOTOR AND DRIVE SHAFT, AN ARRANGEMENT TO TURN SAID DRIVE SHAFT THROUGH A PREDETERMINED ANGLE SO AS TO DELIVER A MEASURED QUANTITY FROM SAID PUMP, COMPRISING IN COMBINATION; FIRST AND SECOND SWITCH MEANS DISPOSED IN THE VICINITY OF SAID DRIVE SHAFT SO SET THAT ONE SWITCH IS OFF UNLESS ENGAGED WHILE THE OTHER SWITCH IS ON UNLESS ENGAGED; A DISC MOUNTED SAID SHAFT FOR ENGAGING SAID FIRST AND SECOND SWITCH MEANS ACTUATING ONE SWITCH ON AND THE OTHERS OFF; SPRING MEANS URGING SAID DISC OUT OF ENGAGEMENT WITH SAID FIRST AND SECOND SWITCH MEANS; ARCUATE CAM MEANS AXIALLY ALIGNED WITH SAID DISC PARTLY ENCIRCLING SAID SHAFT; A LEVER AND ROLLER INTERPOSED BETWEEN SAID CAM AND DISC URGING SAID CAM INTO ENGAGEMENT WITH SAID FIRST AND SECOND SWITCH MEANS WHEN SAID ROLLER RIDES SAID CAM MEANS BUT FREEING SAID DISC FROM ENGAGEMENT WHEN SAID ROLLER IS OFF SAID CAM MEANS; A GEAR WHICH IDLES ON SAID SHAFT COUPLED TO SAID LEVER AND ROLLER TO TURN SAID ROLLER AROUND SAID CAM MEANS; A FIRST CIRCUIT BETWEEN SAID FIRST SWITCH MEANS AND SAID ELECTRIC MOTOR; AND A RESET MOTOR AND DRIVE GEAR DRIVING SAID GEAR WHEEL AND A CIRCUIT BETWEEN SAID SECOND SWITCH MEANS AND SAID RESET MOTOR.