Dispensing device

Claim 1

A CONTROL DEVICE FOR RELEASING A FLUID UNDER PRESSURE COMPRISING A BODY PROVIDING A WALL ENCLOSING A CYLINDRICAL BORE, THE BODY BEING PROVIDED WITH AN INLET AT ONE END LEADING INTO SAID BORE AND A DISCHARGE PORT IN THE WALL REMOTE FROM THE INNER END OF SAID INLET; A PISTON RECIPROCABLY SLIDABLE IN SAID BORE AND MOVABLE UNDER PRESSURE OF SAID FLUID ON THE INNER END THEREOF FROM A FIRST POSITION IN WHICH SAID PORT IS CLOSED BY THE PISTON TO A SECOND POSITION IN WHICH SAID PORT IS OPENED BY THE PISTON; A VALVE IN SAID BODY BETWEEN THE INNER END OF THE PISTON AND SAID INLET FOR RESTRICTING THE FLOW OF FLUID FROM SAID INLET INTO SAID BORE; THE FLUID PRESSURE ON THE INNER END OF THE PISTON BEING DECREASED THEREBY WHEN SAID PORT IS OPENED; A GOVERNING MECHANISM OPERATIVELY CONNECTED TO THE PISTON FOR CONTROLLING THE RATE OF THE MOTION OF THE LATTER FOR AT LEAST A PORTION OF ITS TRAVEL FROM SAID FIRST POSITION TO SAID SECOND POSITION; SECOND MEANS BIASING THE PISTON TOWARD SAID FIRST POSITION, SAID SECOND MEANS BEING EFFECTIVE TO MOVE THE PISTON TO SAID FIRST POSITION UPON DECREASE OF THE FLUID PRESSURE ON SAID INNER END OF THE PISTON; AND MEANS FOR RELEASING THE PISTON FROM THE CONTROL OF SAID GOVERNING MECHANISM DURING A PORTION OF THE STROKE OF THE PISTON IN ONE DIRECTION, AND FOR REESTABLISHING SAID CONTROL AT A PORTION OF THE STROKE OF THE PISTON IN THE OTHER DIRECTION.