Oscillating arm pop-up sprinkler

Claim 1

MEANS FOR POP-UP INSTALLATION OF SPRINKLERS, COMPRISING: A HOUSING DEFINING AN UPPER SPRINKLER-RECEIVING CHAMBER AND A LOWER TUBULAR GUIDE STEM OPEN AT ITS LOWER END AND JOINED TO A WATER SUPPLY LINE; A SLIDE COLLAR AT THE UPPER END OF SAID GUIDE STEM; A TUBULAR SLEEVE OPEN AT BOTH ENDS AND SLIDABLE IN SAID SLIDE COLLAR; MEANS SLIDABLY AND NONROTATABLY CONNECTING SAID SLEEVE WITH SAID GUIDE STEM TO PERMIT MOVEMENT OF SAID SLEEVE AXIALLY INTO SAID SPRINKLER-RECEIVING CHAMBER UNDER URGE OF WATER PRESSURE IN SAID GUIDE STEM; A TUBULAR ROTATABLE STEM JOURNALED IN SAID SLEEVE AND EXTENDING AXIALLY BEYOND THE ENDS THEREOF; SEALING MEANS AT THE EXTREMITIES OF SAID SLEEVE COOPERATING WITH SAID ROTATBLE STEM; OTHER SEALING MEANS AT THE UPPER EXTREMITY OF SAID SLIDE COLLAR COOPERATING WITH SAID SLEEVE; AND A SPRINKLER AT THE OUTER END OF SAID ROTATBLE STEM MOVABLE BETWEEN A RETRACTED POSITION WITHIN SAID SPRINKLER-RECEIVING CHAMBER AND AN EXTENDED POSITION RELATED THERETO.