Oscillating lawn sprinkler

Claim 1

A WAVE TYPE LAWN SPRINKLER COMPRISING A FRAME HAVING AN ARBOR AT ONE END AND A HOUSING ADJACENT ITS OTHER END; SAID HOUSING HAVING WALLS DEFINING AN IMPULSE CHAMBER AND A GEAR CHAMBER, SAID IMPULSE CHAMBER HAVING A FLUID INLET AND OUTLET; A SPRAY TUBE PIVOTALLY MOUNTED AT ONE END IN SAID FLUID OUTLET AND AT ITS OTHER END TO SAID ARBOR, SAID SPRAY TUBE INCLUDING MEANS TO ADJUST THE AREA OF THE PATTERN THEREOF; DRIVE MEANS IN SAID HOUSING COMPRISING AN IMPELLER IN SAID IMPULSE CHAMBER MOUNTED FOR ROTATION THEREIN ON A DRIVE SHAFT JOURNALLED IN SAID HOUSING WALLS AND EXTENDING INTO SAID GEAR CHAMBER; REDUCTION GEARS IN SAID HOUSING AND EXTENDING OUTWARDLY THEREFROM; AND MOTION LINKAGE INTERCONNECTING SAID OUT PUT SHAFT WITH SAID SPRAY TUBE FOR EFFECTING OSCILLATING MOVEMENT TO SAID SPRAY TUBE IN RESPONSE TO ROTATION OF SAID OUTPUT SHAFT; SAID LINKAGE COMPRISING A PAIR OF DISCS CONCENTRICALLY MOUNTED ON SAID OUTPUT SHAFT AND HAVING SPACED APART PORTIONS DEFINING A PASSAGEWAY, A ROD CONNECTING SAID SPRAY TUBE ADJUSTING MEANS TO ONE END OF A LINK ARM PIVOTED AT ITS OTHER END TO SAID HOUSING, A PORTION OF SAID LINK ARM BEING RETAINED IN SAID PASSAGEWAY BY A FOLLOWER FREELY POSITIONED THEREIN AND ADAPTED TO TRAVERSE THE CONFIGURATION THEREOF IN RESPONSE TO ROTATION OF SAID OUTPUT SHAFT, WHEREBY SAID SPRAY TUBE RECEIVES OSCILLATORY MOVEMENT FROM SAID LINK ARM AND FOLLOWER CONFORMING TO THE CONFIGURATION OF SAID PASSAGEWAY.