Air pump with means for mounting on water tank

Claim 1

IN AN AIR VOLUME CONTROL PUMP FOR WATER TANKS AND THE LIKE, THE COMBINATION OF A PLATE HAVING AN INTEGRAL UPRIGHT WALL THEREON, SAID WALL DEFINING A CAVITY OPEN AT THE TOP THEREOF, A COVER FOR SAID CAVITY ATTACHED TO THE TOP OF SAID WALL, A PIPE ATTACHED TO THE BOTTOM OF SAID PLATE SUPPORTING SAID PLATE ON A TANK, A SENSOR ATTACHED TO SAID PLATE INTO SAID TANK FOR SENSING A PREDETERMINED LIQUID LEVEL IN SAID TANK, SAID WALL HAVING A CYLINDER MEANS OPENING INTO SAID CAVITY, A PISTON SLIDABLE IN SAID CYLINDER MEANS, A PISTON ROD CONNECTED TO SAID PISTON, AN ECCENTRIC CONNECTED TO SAID PISTON ROD, MEANS SUPPORTING SAID PISTON ROD AND SAID ECCENTRIC IN SAID CAVITY, SAID MEANS COMPRISING A STUB SHAFT AND ADJUSTABLE MEANS SUPPORTING SAID STUB SHAFT IN THE BOTTOM OF SAID CAVITY SO THAT SAID PISTON AND SAID PISTON ROD ARE ADAPTED TO BE RAISED OR LOWERED WITH RESPECT TO THE AXIS OF SAID CYLINDER MEANS, A MOTOR MOUNTED ON SAID COVER, SAID MOTOR HAVING A SHAFT AND MEANS ALIGNED WITH A HOLE THROUGH SAID COVER CONNECTING SAID SHAFT TO SAID ECCENTRIC, SAID PLATE HAVING AN AIR PASSAGE CONNECTING SAID CYLINDER MEANS TO SAID PIPE, AND MEANS RESPONSIVE TO SAID SENSOR FOR CONNECTING SAID MOTOR TO A SOURCE OF CURRENT SUPPLY WHEN THE LIQUID IN SAID TANK IS AT SAID PREDETERMINED LEVEL.