Pneumatic relay

Claim 1

A PNEUMATIC RELAY OF THE TYPE DESCRIBE AND COMPRISING A HOUSING HAVING A PRESSURE SUPPLY CHAMBER AND AN EXHAUST CHAMBER, A PASSAGE HAVING ONE END COMMUNICATING WITH SAID SUPPLY CHAMBER AND ITS OTHER END COMMUNICATING WITH SAID EXHAUST CHAMBER, AN OUTPUT PRESSURE PORT LEADING OUT FROM SAID PASSAGE BETWEEN ITS ENDS, A FIRST VALVE BODY IN SAID PRESSURE SUPPLY CHAMBER FOR CONTROLLING THE OPENING AT SAID ONE END, SPRING MEANS URGING SAID FIRST VALVE BODY TOWARDS SAID ONE PASSAGE END, DIAPHRAGM MEANS IN SAID EXHAUST CHAMBER ARRANGED FOR MOVEMENT TOWARDS AND AWAY FROM SAID PASSAGE, A SECOND VALVE BODY EXTENDING INTO SAID OTHER PASSAGE END, SAID SECOND VALVE BODY HAVING A BASE PORTION THE SIDES OF WHICH ARE TAPERED WITH RESPECT TO THE LONGITUDINAL AXIS OF SAID PASSAGE, SAID BASE PORTION BEING WIDER THAN THE OPENING AT SAID OTHER PASSAGE END SO THAT SAID SIDES MAY ENGAGE THE EDGES OF THE OPENING, STEM MEANS FORMING PART OF SAID SECOND VALVE BODY AND EXTENDING THROUGH SAID PASSAGE TO CONTACT SAID FIRST VALVE BODY TO MOVE IT AWAY FROM SAID ONE PASSAGE END IN RESPONSE TO MOVEMENT OF SAID SECOND VALVE BODY TOWARDS SAID PASSAGE, AND MOUNTSAID FIRST VALVE BODY TOWARDS SAID ONE PASSAGE END, DIAPHRAGM MEANS, SAID MOUNTING MEANS INCLUDING MEANS TO ACCOMMODATE LATERAL SHIFTING MOVEMENT OF SAID SECOND VALVE BODY MEANS RELATIVE TO SAID DIAPHRAGM MEANS, WHEREBY TO PROVIDE CENTERING OF SAID SECOND VALVE BODY WHEN IT IS FORCED UP AGAINST SAID OTHER PASSAGE END BY THE APPLICATION OF PRESSURE TO THE REVERSE SIDE OF SAID DIAPHRAGM MEANS.