Valve controlled variable pattern lawn sprinkler

Claim 1

A LAWN SPRINKLER COMPRISING A GROUND ENGAGING BASE, A SPRINKLER HEAD MOUNTED ON SAID BASE FOR ROTARY MOVEMENT ABOUT AN UPRIGHT AXIS, SAID SPRINKLER HEAD HAVING MEANS DEFINING A CENTRAL WATER DISTRIBUTING CHAMBER THEREIN INCLUDING AN UPPER END WALL AND A PERIPHERAL WALL PROVIDING A CHAMBER DEFINING PERIPHERAL SURFACE OF REVOLUTION ABOUT THE AXIS OF ROTATION OF SAID HEAD, MEANS CARRIED BY SAID BASE FOR COMMUNICATING A SOURCE OF WATER UNDER PRESSURE WITH SAID CHAMBER, SAID SPRINKLER HEAD INCLUDING A PLURALITY OF ARMS EXTENDING OUTWARDLY FROM SAID PERIPHERAL WALL, EACH OF SAID ARMS HAVING A PASSAGE EXTENDING THERETHROUGH THE INNER END OF WHICH COMMUNICATES WITH SAID CHAMBER THROUGH SAID PERIPHERAL WALL, SAID ARMS HAVING ORIFICE MEANS COMMUNICATING WITH THE OUTER END PORTIONS OF SAID PASSAGES OPERABLE TO EFFECT ROTATION OF SAID HEAD IN RESPONSE TO FLOW OF WATER OUTWARDLY THERETHROUGH, SAID UPPER END WALL HAVING A PLURALITY OF CIRCUMFERENTIALLY SPACED GENERALLY VERTICALLY EXTENDING OPENINGS FORMED THEREIN AND PROVIDING AN ARCUATE DIFFUSING SURFACE DISPOSED ABOVE EACH OF SAID OPENINGS FOR DIFFUSING A STREAM OF WATER ISSUING FROM EACH OF SAID OPENINGS INTO A PLUTIALLY CIRCULAR SEGMENTAL PATTERN ON THE GROUND, A VALVE MEMBER ROTATABLY CARRIED BY SAID HEAD IN SAID CHAMBER FOR ROTATION WITH THE HEAD AND SELECTIVE MOVEMENT INTO A PLURALITY OF OPERATIVE POSITIONS CONTROLLING THE FLOW OF WATER FROM SAID CHAMBER TO SAID PASSAGES AND SAID OPENINGS, SAID VALVE MEMBER INCLUDING A DISC-LIKE PORTION DISPOSED BELOW SAID UPPER END WALL WITHIN SAID CHAMBER TO COVER CERTAIN OF SAID OPENINGS WHEN SAID VALVE MEMBER IS DISPOSED IN CERTAIN OF SAID OPERATIVE POSITIONS AND HAVING OPENING MEANS FORMED THEREIN OPERABLE TO REGISTER WITH CERTAIN OF SAID OPENINGS WHEN SAID VALVE MEMBER IS DISPOSED IN CERTAIN OF SAID OPERATIVE POSITIONS, SAID VALVE MEMBER ALSO INCLUDING A SKIRT PORTION EXTENDING ADJACENT SAID PERIPHERAL WALL WITHIN SAID CHAMBER TO COVER CERTAIN OF SAID PASSAGES WHEN SAID VALVE MEMBER IS DISPOSED IN CERTAIN OF SAID OPERATIVE POSITIONS, SAID VALVE MEMBER ALSO INCLUDING A SKIRT PORTION EXTENDING ADJACENT SAID PERIPHERAL WALL WITHIN SAID CHAMBER TO COVER CERTAIN OF SAID PASSAGES WHEN SAID VALVE MEMBER IS DISPOSED IN CERTAIN OF SAID OPERATIVE POSITIONS AND HAVING OPENING MEANS FORMED THEREIN OPERABLE TO REGISTER WITH CERTAIN OF SAID PASSAGES WHEN SAID VALVE MEMBER IS DISPOSED IN CERTAIN OF SAID OPERATIVE POSITIONS.