US3797787A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Jet engine blast fence
Assignee: Nippon Steel Corp
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Filing: 1972-04-14
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Granted: 1974-03-19
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Expires: 1992-04-14
Abstract
Abstract A jet engine blast fence comprising a blast shield plate made of an expanded metal, a retaining frame to which said blast shield plate is affixed and a base for fixing the retaining frame to the ground in such a manner that the retaining frame is inclined toward the jet blast, the said expanded metal having strands sloping upward in the lee direction, the said strands defining openings which are also horizontally clear so that a part of the blast is positively allowed to pass horizontally through said openings of the expanded metal and is raised upward by a part of the blast which part is deflected obliquely upward in the lee direction along the strands of the expanded metal.
Inventors
- 👤 S Watanabe
- 👤 N Watanabe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 01:28
CPC Classifications
B; B64; B64F; B64F1/00; B64F1/26
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
153 words
A jet engine blast fence comprising: a retaining frame to which the blast shield plate is affixed, a base on which said retaining frame is mounted for fixing the retaining frame to the ground with the retaining frame inclined toward the jet blast, and a blast shield plate made of an expanded metal having a plate thickness of 4.0 to 7.0 mm and a clearance ratio relative to an enveloping plane of the expanded metal of approximately 60 to 80 percent, said expanded metal having the strands thereof sloping upwardly in the lee direction, the said strands defining openings which are also clear in the horizontal direction, whereby a part of the blast is allowed to pass horizontally through said openings of the expanded metal and said part is raised upwardly by a part of the blast which is deflected obliquely upwardly in the lee direction along the strands of the expanded metal.
Claim 2
Dependent Claim
153 words
A jet engine blast fence comprising: a retaining frame to which the blast shield plate is affixed, a base on which said retaining frame is mounted for fixing the retaining frame to the ground with the retaining frame inclined toward the jet blast, and a blast shield plate made of an expanded metal having a plate thickness of 4.0 to 7.0 mm and a clearance ratio relative to an enveloping plane of the expanded metal of approximately 60 to 80 percent, said expanded metal having the strands thereof sloping upwardly in the lee direction, the said strands defining openings which are also clear in the horizontal direction, whereby a part of the blast is allowed to pass horizontally through said openings of the expanded metal and said part is raised upwardly by a part of the blast which is deflected obliquely upwardly in the lee direction along the strands of the expanded metal.
Claim 3
Dependent Claim
91 words
A blast fence as defined in claim 1 wherein said retaining frame comprises: a middle horizontal member of shaped steel, an upper and a lower horizontal member, both being of shaped steel and substantially equally spaced upwardly and downwardly from said middle horizontal member, and a multiplicity of longitudinal members of shaped steel which are arranged perpendicularly to the middle, upper and lower horizontal members and spaced transversely at regular intervals, said horizontal and longitudinal members together constituting a Rahmen structure wherein a plurality of upper and lower sub-frames are formed.
Claim 4
Dependent Claim
59 words
A blast fence as claimed in claim 2 wherein said members of said frame have flanges thereon and said blast shield plate is secured to said retaining frame all over said retaining frame, the said blast shield plate consisting of plate sectiOns the circumferential sides of which are welded to the flanges of the said horizontal and longitudinal members.
Claim 5
Dependent Claim
88 words
A blast fence as claimed in claim 2 wherein said blast shield plate is comprised of separate upper and lower sections which are bent in respect to each other with the middle horizontal member disposed therebetween and the angle of inclination of the upper blast shield plate in relation to a vertical plane is slightly smaller than that of the lower shield plate, whereby the jet stream having passed through the lower shield plate serves to raise the jet stream which has passed through the upper shield plate.
Claim 6
Dependent Claim
52 words
A blast fence as claimed in claim 4 wherein the angle of inclination of said upper blast shield plate in relation to the vertical plane is approximately 10* to 15* while the angle of inclination of said lower blast shield plate in relation to the vertical plane is approximately 35* to 40*.
References Cited (Backward Citations)
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US1523995A
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US2187641A
Cited
US2765994A
Cited
US3037726A
Cited
US3010684A
Cited
US3191728A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-03-18 | 1977-09-17 | 1978-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-18 | 1981-09-17 | 1982-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-18 | 1985-09-17 | 1986-03-19 | $7700.00 | Window Closed / Lapsed |