초록 ▼

A pop-up sprinkler unit for mounting beneath the surface of a soil formation includes an outer cylindrical housing for subsurface mounting, with an inner housing carrying a nozzle and drive turbine reciprocally mounted in the outer housing for extending up through a portion of the soil and pressure

A pop-up sprinkler unit for mounting beneath the surface of a soil formation includes an outer cylindrical housing for subsurface mounting, with an inner housing carrying a nozzle and drive turbine reciprocally mounted in the outer housing for extending up through a portion of the soil and pressure responsive seals disposed between the inner and outer housings for sealing at predetermined pressures.

대표청구항 ▼

[ We claim:] [1.] A pop-up sprinkler unit for mounting beneath the surface of the soil of an earth formation, comprising:an elongated outer housing member having a cylindrical through bore extending from an inlet for connecting to a source of pressurized water to an outlet end for receiving a retrac

[ We claim:] [1.] A pop-up sprinkler unit for mounting beneath the surface of the soil of an earth formation, comprising:an elongated outer housing member having a cylindrical through bore extending from an inlet for connecting to a source of pressurized water to an outlet end for receiving a retractable housing;an elongated inner housing having an inner end and an outer end with a nozzle mounted on said outer end thereof reciprocally mounted in said bore and movable between a retracted position within said bore and an extended position wherein said outer end and said nozzle is extended from said outlet end of said bore, and said inner housing responsive to said pressurized water for extending to said extended position from said bore;spring means for normally biasing said inner housing to said retracted position; andpressure responsive seal means disposed between said inner housing and said outer housing, said seal means having a base portion mounting said seal means to one of said inner and said outer housings, and said seal means including an annular lip extending toward said retracted position of said inner housing, and said lip being normally retracted from a surface of the other of said inner and said outer housing, and responsive to a predetermined minimum water pressure to extend into sealing engagement with the other of said inner and said outer housings.