Switch for detecting piston in fluid flow line

Claim 1

A PISTON DETECTOR SWITCH ADAPTED TO BE POSITIONED ON A PIPE HAVING A SMALL DIAMETER OPENING IN THE UPPER SURFACE THEREOF TO DETECT THE PASSAGE OF A PISTON IN THE PIPE MOVING IN EITHER DIRECTION, SAID PISTON DETECTOR SWITCHING COMPRISING: A HOLLOW UPSTANDING BODY MEMBER SEALABLY AFFIXED TO SAID PIPE ENCOMPASSING SAID OPENING IN SAID PIPE; A TUBULAR SHAFT HOUSING AFFIXED TO AND COMMUNICATING WITH THE INTERIOR OF SAID BODY MEMBER AND EXTENDING SUBSTANTIALLY IN A PLANE PARALLEL THE PLANE OF SAID PIPE; A SHAFT ROTATIVELY SUPPORTED IN SAID SHAFT HOUSING HAVING ONE END THEREOF EXTENDING WITHIN SAID HOLLOW BODY MEMBER; A BALL OF A DIAMETER SLIGHTLY LARGER THAN THE DIAMETER OF SAID OPENING IN SAID PIPE, SAID BALL LOOSELY AND ROTATIVELY POSITIONED IN SAID OPENING IN SAID PIPE AND WITHIN SAID HOLLOW BODY MEMBER WHEREBY A PORTION OF SAID BALL NORMALLY PROTRUDES WITHIN THE INTERIOR OF SAID PIPE; AN ACTUATOR CAM MEMBER AFFIXED AT ONE END TO SAID SHAFT WITHIN SAID HOLLOW BODY MEMBER, SAID ACTUATOR CAM MEMBER EXTENDING TO ENGAGE THE UPPER SURFACE OF SAID BALL WHEREBY THE DISPLACEMENT OF SAID BALL ROTATES SAID SHAFT; AN ENCLOSED SWITCH HOUSING SUPPORTED TO AND COMMUNICATING WITH SAID TUBULAR SHAFT HOUSING, THE OTHER END OF SAID SHAFT TERMINATING WITHIN SAID SWITCH HOUSING; A MICROSWITCH HAVING AN ACTUATOR PLUNGER EXTENDING THEREFROM, THE MICROSWITCH SUPPORTED IN SAID SWITCH HOUSING AND ADJACENT SAID SHAFT; AND A SWITCH CAM AFFIXED TO SAID SHAFT WITHIN SAID HOUSING, SAID CAM ENGAGING SAID SWITCH ACTUATOR PLUNGER TO DEPRESS SAID ACTUATOR PLUNGER UPON THE ROTATION OF SAID SHAFT BY THE DISPLACEMENT OF SAID BALL.