US3719327A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drip irrigation nozzle
Assignee: MCMAHAN BROTHERS Mfg CO Inc
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Filing: 1971-08-13
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Granted: 1973-03-06
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Expires: 1991-08-13
Abstract
Abstract A drip irrigation nozzle having pressure regulating and selfcleaning characteristics. The nozzle includes a resilient closure member which in a flow limiting position partially blocks the nozzle metering orifice in proportion to the pressure of the supplied fluid. The nozzle discharge or ''''drip'''' rate thus is substantially independent of fluid supply pressure. When the irrigation fluid is turned on or off, the transient burst of fluid past the closure member cleans debris from the nozzle.
Inventors
- 👤 W Mcmahan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 07:03
CPC Classifications
F; F16; F16K; F16K25/00; F16K25/02; A; A01; A01G; A01G25/00; A01G25/02; A01G25/023; Y; Y02; Y02A; Y02A40/00; Y02A40/10; Y02A40/22
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
159 words
A drip irrigation nozzle comprising: a generally cylindrical outer body member adapted for connection to a fluid supplying conduit, a generally cylindrical inner body member threadedly mounted within said outer body member to permit adjustment of the relative axial position of said inner and outer body members, a resilient closure member, a closure supporting shaft extending through said inner body member with a fluid flow permitting discharge passageway therebetween, said closure member being attached to said shaft, fluid supplied via said conduit forcing said closure member toward a fluid flow limiting position against said inner or outer body member, and a metering orifice allowing fluid to drip past said closure member and through said discharge passageway when said closure member is in said fluid flow limiting position, said resilient closure member more or less closing said metering orifice in response to variation in fluid supply pressure, thereby providing a substantially uniform fluid drip rate independent of fluid supply pressure.
Claim 2
Dependent Claim
159 words
A drip irrigation nozzle comprising: a generally cylindrical outer body member adapted for connection to a fluid supplying conduit, a generally cylindrical inner body member threadedly mounted within said outer body member to permit adjustment of the relative axial position of said inner and outer body members, a resilient closure member, a closure supporting shaft extending through said inner body member with a fluid flow permitting discharge passageway therebetween, said closure member being attached to said shaft, fluid supplied via said conduit forcing said closure member toward a fluid flow limiting position against said inner or outer body member, and a metering orifice allowing fluid to drip past said closure member and through said discharge passageway when said closure member is in said fluid flow limiting position, said resilient closure member more or less closing said metering orifice in response to variation in fluid supply pressure, thereby providing a substantially uniform fluid drip rate independent of fluid supply pressure.
Claim 3
Dependent Claim
159 words
A drip irrigation nozzle comprising: a generally cylindrical outer body member adapted for connection to a fluid supplying conduit, a generally cylindrical inner body member threadedly mounted within said outer body member to permit adjustment of the relative axial position of said inner and outer body members, a resilient closure member, a closure supporting shaft extending through said inner body member with a fluid flow permitting discharge passageway therebetween, said closure member being attached to said shaft, fluid supplied via said conduit forcing said closure member toward a fluid flow limiting position against said inner or outer body member, and a metering orifice allowing fluid to drip past said closure member and through said discharge passageway when said closure member is in said fluid flow limiting position, said resilient closure member more or less closing said metering orifice in response to variation in fluid supply pressure, thereby providing a substantially uniform fluid drip rate independent of fluid supply pressure.
Claim 4
Dependent Claim
159 words
A drip irrigation nozzle comprising: a generally cylindrical outer body member adapted for connection to a fluid supplying conduit, a generally cylindrical inner body member threadedly mounted within said outer body member to permit adjustment of the relative axial position of said inner and outer body members, a resilient closure member, a closure supporting shaft extending through said inner body member with a fluid flow permitting discharge passageway therebetween, said closure member being attached to said shaft, fluid supplied via said conduit forcing said closure member toward a fluid flow limiting position against said inner or outer body member, and a metering orifice allowing fluid to drip past said closure member and through said discharge passageway when said closure member is in said fluid flow limiting position, said resilient closure member more or less closing said metering orifice in response to variation in fluid supply pressure, thereby providing a substantially uniform fluid drip rate independent of fluid supply pressure.
Claim 5
Dependent Claim
39 words
A drip irrigation nozzle according to claim 1 wherein said outer body member has a conduit connecting portion forming a housing for said closure member, one end of said housing being closed except for an interiorly threaded opening therethrough.
Claim 6
Dependent Claim
37 words
A drip irrigation nozzle according to claim 2 wherein the diameter of said closure member is greater than the interior diameter of said interiorly threaded opening, said housing one end being notched to form said metering orifice.
Claim 7
Dependent Claim
31 words
A drip irrigation nozzle according to claim 2 further comprising a filter disc disposed transversely across the interior of said housing and attached to the lower end of said closure member.
Claim 8
Dependent Claim
46 words
A drip irrigation nozzle according to claim 2 wherein a surface of said closure member is notched, and wherein said inner body member projects beyond said housing one end, said notched closure member surface seating against said inner body member in said fluid flow limiting position.
Claim 9
Dependent Claim
37 words
A drip irrigation nozzle according to claim 1 wherein said metering orifice comprises at least one notch in the surface of said closure member which is forced against said body member in said fluid flow limiting position.
Claim 10
Dependent Claim
60 words
A drip irrigation nozzle according to claim 1 wherein the end of said outer body member facing said conduit is notched radially, said relative axial position establishing the degree to which said inner body member eclipses said notch to control the amount of fluid dripping therethrough when said closure member is in said flow limiting position against said notched end.
Claim 11
Dependent Claim
59 words
A drip irrigation nozzle according to claim 1 wherein the other end of said shaft includes a flange abutting against said inner body member to limit the extent of travel of said closure member away from said flow limiting position and to cover the discharge passageway through said inner body member when no fluid is supplied by said conduit.
Claim 12
Dependent Claim
87 words
A drip irrigation nozzle according to claim 8 wherein said shaft is disposed vertically, said closure member dropping downward away from said flow limiting position when said fluid supply is terminated, said closure member being forced upwardly toward said flow limiting position by the pressure of said fluid when said supply is turned on, said nozzle being cleaned by the burst of fluid flowing past said closure member during the transient period taken for said closure member to reach or drop away from said flow limiting position.
Claim 13
Dependent Claim
28 words
A drip irrigation nozzle according to claim 1 wherein said metering orifice comprises at least one notch in the end of said inner body member facing said closure.
Claim 14
Dependent Claim
28 words
A drip irrigation nozzle according to claim 1 wherein said metering orifice comprises at least one notch in the surface of said outer body member facing said closure.
Claim 15
Dependent Claim
169 words
For use in a drip irrigation system wherein irrigation fluid is supplied via a conduit to a plurality of nozzles, a nozzle including: a. a first body member having associated means for connection to said conduit and having a discharge passageway therethrough, b. a resilient closure member fabricated of rubber or plastic, c. said closure member being attached to a shaft loosely extending through said discharge passageway, the other end of said shaft cooperating with said first body member to permit limited travel of said closure member toward or away from said first body member, d. a metering orifice in the fluid path from said conduit to said passageway, e. fluid from said conduit forcing said closure member toward a position in which fluid flow between said conduit and said passageway is limited only to said metering orifice, the extent to which said closure member blocks said orifice being proportional to the supplied fluid pressure, thereby providing a uniform drip rate substantially independent of pressure variation along the conduit.
Claim 16
Dependent Claim
169 words
For use in a drip irrigation system wherein irrigation fluid is supplied via a conduit to a plurality of nozzles, a nozzle including: a. a first body member having associated means for connection to said conduit and having a discharge passageway therethrough, b. a resilient closure member fabricated of rubber or plastic, c. said closure member being attached to a shaft loosely extending through said discharge passageway, the other end of said shaft cooperating with said first body member to permit limited travel of said closure member toward or away from said first body member, d. a metering orifice in the fluid path from said conduit to said passageway, e. fluid from said conduit forcing said closure member toward a position in which fluid flow between said conduit and said passageway is limited only to said metering orifice, the extent to which said closure member blocks said orifice being proportional to the supplied fluid pressure, thereby providing a uniform drip rate substantially independent of pressure variation along the conduit.
Claim 17
Dependent Claim
25 words
A nozzle according to claim 12 wherein said metering orifice comprises a notch in the end of said closure member facing said first body member.
Claim 18
Dependent Claim
38 words
A nozzle according to claim 10 adapted to be flushed clean by depression of said other shaft end to move said closure member away from said flow limiting position, thereby permitting water to rush through said discharge passageway.
Claim 19
Dependent Claim
25 words
A nozzle according to claim 12 wherein said first body member is adjustably positioned within a second body member adapted for connection to said conduit.
Claim 20
Dependent Claim
18 words
A nozzle according to claim 15 wherein said metering orifice comprises a notch in said second body member.
Claim 21
Dependent Claim
27 words
A nozzle according to claim 16 wherein said first body member may be adjustably positioned to eclipse a portion of said notch to establish said drip rate.
Claim 22
Dependent Claim
53 words
A nozzle according to claim 15, said nozzle being convertible into a full circle sprinkler by adjustably positioning said first body member not to eclipse said metering orifice, said shaft having a conical upper end, fluid flowing through said discharge passageway being deflected into a circular spray by said shaft conical upper end.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-03-05 | 1976-09-04 | 1977-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-05 | 1980-09-04 | 1981-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-05 | 1984-09-04 | 1985-03-06 | $7700.00 | Window Closed / Lapsed |