US4789116A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Landing deck for aircraft
Assignee: Raufoss Ammunisjonsfabrikker AS
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Filing: 1985-06-27
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Granted: 1988-12-06
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Expires: 2005-06-27
Abstract
Abstract Landing deck for aircraft, in particular for helicopters, on seagoing vessels and offshore installations, such as platforms. When fuel is leaking from a helicopter after an accident, as for instance an unsuccessful landing, a fire often starts. In order to reduce the combustion intensity and the duration of such a fire continuous grooves or channels (8) are formed in beams of steel or metal, of which the deck is made, in the surface facing upwardly. Thereby fuel which has leaked out will be collected in the grooves or channels. The air supply to the grooves or channels is poorer than the air supply to fuel situated on decks without grooves or channels, and the combustion intensity, therefore, is reduced. Moreover, the combustion takes place on the surface of the liquid, and it is possible to drain a substantial part of the fuel without ignition thereof. Fuel may be collected from the grooves or channels by means of a collecting manifold or gutter.
Inventors
- 👤 Bard Eftestol
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 12:18
CPC Classifications
B; B64; B64F; B64F1/00; B64F1/002; E; E01; E01C; E01C11/00; E01C11/22; E01C11/224; E01C11/227; A; A62; A62C; A62C3/00; E01C9/00; E01C9/008; E01F; E01F3/00
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
118 words
A landing deck for aircraft which provides enhanced removal of liquids deposited thereon, said landing deck comprising a plurality of parallel drainage beams which are situated in side-by-side relationship to one another, said drainage beams being inclined along their longitudinal dimensions, each of said drainage beams including upper flanges which define a longitudinal slit therebetween and channel walls extending below said upper flanges which form a longitudinal drainage channel below said upper flanges, said longitudinal slit communicating with said longitudinal drainage channel to enable liquid located on said upper flanges to flow through said longitudinal slit and into said longitudinal drainage channel, said longitudinal slit having a narrower width than the maximum width of said longitudinal drainage channel.
Claim 2
Dependent Claim
118 words
A landing deck for aircraft which provides enhanced removal of liquids deposited thereon, said landing deck comprising a plurality of parallel drainage beams which are situated in side-by-side relationship to one another, said drainage beams being inclined along their longitudinal dimensions, each of said drainage beams including upper flanges which define a longitudinal slit therebetween and channel walls extending below said upper flanges which form a longitudinal drainage channel below said upper flanges, said longitudinal slit communicating with said longitudinal drainage channel to enable liquid located on said upper flanges to flow through said longitudinal slit and into said longitudinal drainage channel, said longitudinal slit having a narrower width than the maximum width of said longitudinal drainage channel.
Claim 3
Dependent Claim
22 words
A landing deck as defined in claim 1, wherein each of said upper flanges are inclined downwardly towards said longitudinal slit therebetween.
Claim 4
Dependent Claim
72 words
A landing deck as defined in claim 2, wherein each of the first and second upper flanges includes a free edge remote from said longitudinal slit, and wherein the free edge of one of said upper flanges forms a slot and the free edge of the other of said upper flanges forms a tongue, a tongue of one said drainage beams being insertable in a groove of another of said drainage beams.
Claim 5
Dependent Claim
32 words
A landing deck as defined in claim 2, including a seal means between the tongue of each drainage beam and the slot of the adjacent drainage beam in which the tongue fits.
Claim 6
Dependent Claim
17 words
A landing deck as defined in claim 4, wherein each seal means comprises a double-sided adhesive tape.
Claim 7
Dependent Claim
22 words
A landing deck as defined in claim 1, wherein each said drainage beam includes a lower flange connected to said channel walls.
Claim 8
Dependent Claim
16 words
A landing deck as defined in claim 1, wherein each drainage beam is made of steel.
Claim 9
Dependent Claim
16 words
A landing deck as defined in claim 1, wherein each drainage beam is made of aluminum.
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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) | 1991-12-06 | 1992-06-06 | 1992-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-12-06 | 1996-06-06 | 1996-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-12-06 | 2000-06-06 | 2000-12-06 | $7700.00 | Window Closed / Lapsed |