Fluid sprinkling – spraying – and diffusing – Conduit or nozzle attached irrigation-type decelerator
Patent
1989-06-09
1991-12-31
Kashnikow, Andres
Fluid sprinkling, spraying, and diffusing
Conduit or nozzle attached irrigation-type decelerator
138 42, 156285, 264511, B05B 1500
Patent
active
050764985
DESCRIPTION:
BRIEF SUMMARY
This invention relates to an irrigation tape of the general type in which an elongated tape is provided with a waterway which extends longitudinally along the tape and communicates with a series of flow restrictor channels of tortuous form, at least one of each channels having an inlet to the waterway and at least an outlet being provided from each channel remote from the inlet to allow the outflow through the tortuous channel.
This general type of irrigation tape is already known, and for instance in Australian Patent No. 516,536 (29122/77) and corresponding U.S. Pat. No. 4,195,784 in the name of Gideon Gilead is shown a tape formed by superimposing three foils and marginally dividing together the foils, a water channel being provided between two of the foils while between one of these foils and a third foil is formed the series of flow restricted channels which have communication with the flow channel and with the atmosphere, the inlet and outlet points being displaced in relation to each other along the flow control channel.
A similar Gilead specification is U.S. Pat. No. 4,175,882 filed Dec. 29, 1976, but containing more restricted claims than in the Australian counterpart.
Similarly the complete specification of Australian Patent Application No. 34599/76 in the name of Jaime Sahagun-Barragan shows a further form of such tape and relates particularly to a specific form of tortuous part whereby the flow rate is broken down to allow the tape to act as a trickle feed of water to an area from the waterway of the tape.
The referred to prior art documents are distinguished principally by the position of the marginal joins of the foils which form the tape.
The specification of U.S. Pat. No. 4,548,360, May 22, 1984, in the name of Daniel W. C. Delmer uses a single foil doubled back to form a supply tube and overlapped to form a bleed channel between overlapped edges of the foil, but the bleed channels results from the overlap.
A recently filed specification by Townsend Controls Pty. Ltd., Australian Patent Application No. 33361/84, published Mar. 28, 1985, also relates to this type of irrigation tape but relates principally to a particular pattern of the flow restrictor channel and the method by which the channels are produced.
In this form a single foil is twice overlapped to form a water channel on one side of a medial portion, a tortuous channel being formed on the other side by embossing.
It is and object of this invention to provide a continuous irrigation tape which is simple to construct and does not require precision laying of adhesives or other connecting elements between the forming foils.
It is a further object to provide a simple and effective method of forming such a tape.
Other objects will be apparent from the following description.
The drip irrigation tape according to the invention is formed from one or more foils, formed from thermo-plastic material and sealed to produce a main waterway extending along the tape, and a series of tortuous flow restricting channels formed in a portion of the foil which co-operates with another portion of the foil to close the channels, each channel communicating at one position with the main waterway and having an outlet at another position to give a drip feed from each channel to an area to be watered.
While the construction can use one or more foils marginally fused together, the preferred method uses a tubular foil or individual sections which can be extruded directly to the tape forming machine where it is shaped and manipulated to provide overlapping sections with two sections forming the wall of the waterway and another section carrying the flow restricted channels, this section being fused to one wall section.
Features of the invention include a method of folding the vacuum forming means for the flow restricting channels, also the temperatures controls for fusing, as well as heat flow control, cutting of apertures in the foils, cutting or nicking an outlet in the restricted channels, controlling the distance between inlet and outlet of each of the restric
REFERENCES:
patent: 3126580 (1964-03-01), Paschke
patent: 3895087 (1975-07-01), Ottinger et al.
patent: 4175882 (1979-11-01), Gilead
patent: 4177102 (1979-12-01), Tokuno
patent: 4195784 (1980-04-01), Gilead
patent: 4473191 (1984-09-01), Chapin
patent: 4548360 (1985-10-01), Delmer
patent: 4657625 (1987-04-01), Kawakami
patent: 4722759 (1988-02-01), Roberts et al.
patent: 4731138 (1988-03-01), Lupke
Forman Michael J.
Kashnikow Andres
Townsend Controls Pty. Ltd.
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