Timer valve

Claim 1

IN A TIMER VALVE OF THE TYPE HAVING A VALVE BODY, A VALVE SEAT IN THE BODY, AN INLET OPENING COMMUNICATING WITH THE VALVE SEAT, AN OUTLET OPENING, CONDUIT MEANS BETWEEN THE VALVE SEAT AND THE OUTLET OPENING, CASING MEANS SECURED TO SAID VALVE BODY HAVING A CYLINDER OPPOSITE THE VALVE SEAT, A PISTON MOUNTED FOR RECIPROCATING MOVEMENT IN THE CYLINDER AND HAVING A VALVE ELEMENT THEREON TO ENGAGE SAID VALVE SEAT, SAID PISTON HAVING A PASSAGEWAY THERETHROUGH COMMUNICATING BETWEEN THE INLET OPENING AND THE CYLINDER, AND RESILIENT MEANS URGING THE VALVE ELEMENT TOWARD THE VALVE SEAT, THE IMPROVEMENT COMPRISING: A SHAFT EXTENDING THROUGH THE CASING MEANS IN AXIAL ALIGNMENT WITH THE CYLINDER, SAID CYLINDER HAVING A PORT IN ITS SIDEWALL COMMUNICATING BETWEEN THE OUTLET OPENING AND THE INTERIOR OF THE CYLINDER, A CAM IN THE CYLINDER MOUNTED ON THE SHAFT AND EXTENDING RADIALLY TO THE CYLINDER SIDEWALL FOR COVERING SAID SIDEWALL PORT IN A FIRST ROTARY POSITION AND UNCOVERING SAID PORT IN A SECOND ROTARY POSITION, A SPRING IN THE VALVE BODY CONNECTED TO THE SHAFT AND BIASING THE SHAFT TO ROTATE THE CAM TOWARD THE FIRST ROTARY POSITION, SAID CASING MEANS HAVING A CLOSED CHAMBER FORMED THEREIN OPPOSITE SAID CYLINDER AND COAXIAL THEREWITH ENCLOSING A PORTION OF THE SHAFT, A DISC IN THE CHAMBER MOUNTED ON THE SHAFT, A PERIPHERAL SURFACE ON THE DISC SPACED FROM AND FACING AN INTERIOR SURFACE OF THE CHAMBER, AND A VISCOUS FLUID FILLING THE SPACE BETWEEN SAID SURFACES, WHEREBY ROTATION OF THE SHAFT IN ONE DIRECTION UNCOVERS THE PORT PERMITTING THE PISTON TO BE DISPLACED OFF THE VALVE SEAT AND THE DISC RETARDS MOVEMENT OF THE CAM TOWARD THE PORT.