Plastic and nonmetallic article shaping or treating: processes – Forming continuous or indefinite length work – Of varying cross-sectional area or with intermittent...
Patent
1995-02-17
1997-10-14
Weldon, Kevin
Plastic and nonmetallic article shaping or treating: processes
Forming continuous or indefinite length work
Of varying cross-sectional area or with intermittent...
26417111, 26417127, 2642093, 239542, B29C 4702
Patent
active
056768974
ABSTRACT:
The dripline duct with internally attached emitter is used for irrigation. The duct is plastic and continuous, but does not have constant cross-section along its total length. The emitter may be simple, namely only having internally a meandering stroke or other form of stroke for adjusting the supply, or may be auto-adjusting for securing constant supply at a particular area of water pressures.
The emitters are entered one by one in the interior of the duct at its production phase and are covered almost totally by the wall of the duct with is obviously swollen at this point, holding firmly the emitter in its interior. The cross-section of the duct is completely free along the total length. The emitter may also have an elevated water outflow end-tube.
REFERENCES:
patent: 3895085 (1975-07-01), Suzuki
patent: 4366926 (1983-01-01), Nehouder
patent: 5234379 (1994-06-01), Eckstein
patent: 5282916 (1994-02-01), Bloom
patent: 5324371 (1994-06-01), Mehoudar
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