US3561536A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Jet head for foam generators
Assignee: Individual
•
Filing: 1968-06-12
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Granted: 1971-02-09
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Expires: 1988-06-12
Abstract
Abstract A jet head for a fire-fighting foam generator by which the jet is caused to form a uniform conical spray of droplets without substantial loss of kinetic energy. The liquid stream to form the jet passes through a chamber having an inlet orifice with slots around its periphery, and the part of the stream that passes through these slots impinges on the end wall of the chamber around the periphery of the outlet orifice.
Inventors
- 👤 Thomas Anthony Henshaw
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:51
CPC Classifications
A; A62; A62C; A62C31/00; A62C31/005
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
190 words
For the production of a conical spray of liquid to be formed into foam by the incorporation of air, a device comprising a tube for the supply of liquid and a jet head at the end of the tube, the jet head comprising a chamber with opposed end walls, one end wall being formed with an inlet orifice from the periphery of which slots extend outwards, and the other end wall being formed with an outlet orifice, both the inlet and outlet orifices being smaller in cross-sectional area than the chamber, and the diameters of the orifices and their distance apart being such that in the absence of the slots liquid supplied under appropriate pressure for forming foam would pass as a solid jet from the inlet orifice through the outlet orifice, and the slots being of such spacing and dimensions that liquid supplied under appropriate pressure for forming form and passing through the slots impinges on the second end wall around the outlet orifice, whereby the jet is broken up into a uniform conical spray of droplets without substantial loss of kinetic energy of the jet as a whole.
Claim 2
Dependent Claim
190 words
For the production of a conical spray of liquid to be formed into foam by the incorporation of air, a device comprising a tube for the supply of liquid and a jet head at the end of the tube, the jet head comprising a chamber with opposed end walls, one end wall being formed with an inlet orifice from the periphery of which slots extend outwards, and the other end wall being formed with an outlet orifice, both the inlet and outlet orifices being smaller in cross-sectional area than the chamber, and the diameters of the orifices and their distance apart being such that in the absence of the slots liquid supplied under appropriate pressure for forming foam would pass as a solid jet from the inlet orifice through the outlet orifice, and the slots being of such spacing and dimensions that liquid supplied under appropriate pressure for forming form and passing through the slots impinges on the second end wall around the outlet orifice, whereby the jet is broken up into a uniform conical spray of droplets without substantial loss of kinetic energy of the jet as a whole.
Claim 3
Dependent Claim
24 words
A jet head according to claim 1 in which the inlet orifice has from four to 12 rectangular slots equally spaced around its periphery.
Claim 4
Dependent Claim
72 words
A jet head as claimed in claim 1 in which the distance between the inlet and outlet orifices is between 0.25 and three times the diameter of the outlet orifice, the slots extend from the periphery of the inlet orifice to a distance of between 0.125 R and 0.5 R and the width of each slot is between 0.1 R and 0.5 R, where R is the radius of the inlet orifice.
Claim 5
Dependent Claim
21 words
A jet head as claimed in claim 3 in which the inlet and outlet orifices are of the same cross-sectional area.
Claim 6
Dependent Claim
51 words
A jet head according to claim 3 in which the inlet orifice has six slots equally spaced around its periphery, each slot extending outwards from the periphery to a distance of 0.25 R and the width of each slot being 0.2 R, where R is the radius of the inlet orifice.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-02-08 | 1974-08-10 | 1975-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-08 | 1978-08-10 | 1979-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-08 | 1982-08-10 | 1983-02-09 | $7700.00 | Window Closed / Lapsed |