INFLATABLE FLOATABLE LIFERAFT FOR MARINE RESCUE

• US 20140199901A1
• Filed: 06/15/2012
• Published: 07/17/2014
• Est. Priority Date: 06/17/2011
• Status: Active Grant

• Current Assignee: Viking Life-Saving Equipment A/S (Claus Sørensen Fond Holding A/S)
• Original Assignee: Viking Life-Saving Equipment A/S (Claus Sørensen Fond Holding A/S)
• Inventors: Ibsen, Christian, Pedersen, Knud Sndertoft
• Granted Patent: US 9,352,813 B2
• Time in Patent Office: Days
• US Class Current: 441/42
• CPC Class Codes: B63B 1/14 the hulls being interconnected resiliently or having means for actively varying hull shape or configuration collapsible, foldable, inflatable or like vessels B63B7/00
• CPC Class Codes: B63B 1/34 by reducing surface friction
• CPC Class Codes: B63B 2029/043 Seats; Arrangements thereof on vessels
• CPC Class Codes: B63C 2009/042 inflatable
• CPC Class Codes: B63C 2009/044 covered
• CPC Class Codes: B63C 9/04 Life-rafts
• CPC Class Codes: B63H 2005/005 Front propulsors, i.e. propellers, paddle wheels, or the like substantially arranged ahead of the vessels' midship section
• CPC Class Codes: B63H 2005/1254 Podded azimuthing thrusters, i.e. podded thruster units arranged inboard for rotation about vertical axis
• CPC Class Codes: B63H 5/08 of more than one propeller
• CPC Class Codes: Y02T 70/10 Measures concerning design or construction of watercraft hulls

Abstract

The present invention relates to an inflatable floatable liferaft (1) for marine rescue which in its deflated state is capable of being stored in a container on board a ship, vessel or sea installation, and which is inflatable when deployed into the water, the fully inflatable floatable liferaft (1) extending in a longitudinal direction and comprising a non-rigid bottom element (2) having a water side (2a) and an air side (2b). The inflatable floatable liferaft (1) further comprises a plurality of non-rigid floatation tubes (3) arranged beneath the non-rigid bottom element (2), the non-rigid bottom element (2) extending in the longitudinal direction and being arranged with an intermediate distance (ID1) between neighbouring non-rigid floatation tubes (3). The present invention further more relates to improved propulsion through the water of such an inflatable liferaft (1).

Claims

1. An inflatable floatable liferaft for marine rescue which in its deflated state is capable of being stored in a container on board a ship, vessel or sea installation, and which is inflatable when deployed into the water, the fully inflatable floatable liferaft extending in a longitudinal direction and comprising a non-rigid bottom element having a water side and an air side, wherein the inflatable floatable liferaft further comprises a plurality of non-rigid floatation tubes arranged beneath the non-rigid bottom element, the non-rigid floatation tubes extending in the longitudinal direction and being arranged with an intermediate distance between neighbouring non-rigid floatation tubes.

2. The inflatable floatable liferaft according to claim 1, wherein the intermediate distance between two neighbouring non-rigid floatation tubes is longer than an average of a first width of one of the neighbouring non-rigid floatation tubes and a second width of the other of the neighbouring non-rigid floatation tubes.

3. The inflatable floatable liferaft according to claim 1, wherein the water side of the non-rigid bottom element is above sea level when the floatable liferaft is fully loaded with passengers.

4. The inflatable floatable liferaft according to claim 1, wherein the inflatable floatable liferaft has a drag coefficient C_d below 1 at a speed of more than 3 knots, such as more preferably a drag coefficient C_d below 0.75 at a speed of more than 3.5 knots, or even more preferably a drag coefficient C_d below 0.5 at a speed of more than 4 knots.

5. The inflatable floatable liferaft according to claim 1, wherein the non-rigid floatation tubes have a bow end and a stern end, and at least the bow end has a drag-reducing end shape, such as a cone shape or other tapered shape.

6. The inflatable floatable liferaft according to claim 5, wherein the drag-reducing end shape is constituted by floatation tube side walls sealed in a substantially vertical bond at the bow end, constituting a vertical keel shape or a vertical bow shape.

7. The inflatable floatable liferaft according to claim 1, wherein the surfaces of the inflatable non-rigid floatation tubes comprise a drag-reducing coating, such as a water ablative paint or coating.

8. The inflatable floatable liferaft according to claim 1, further comprising a propulsion device.

9. The inflatable floatable liferaft according to claim 1, further comprising at least two propulsion devices arranged in a bow starboard position of the floatable liferaft and in a bow port position of the floatable liferaft.

10. The inflatable floatable liferaft according to claim 1, further comprising at least four propulsion devices arranged in a bow starboard position, in a bow port position, in a stern starboard position and in a stern port position of the floatable liferaft.

11. The inflatable floatable liferaft according to claim 9, wherein the propulsion devices arranged in the bow starboard position and in the bow port position of the floatable liferaft have a non-level bow propulsion direction pointing towards the water surface when the floatable liferaft is in forward motion to oppose drag effects.

12. The inflatable floatable liferaft according to claim 9, wherein the propulsion devices arranged in the bow starboard position and in the bow port position of the floatable liferaft have the non-level bow propulsion direction pointing towards the water surface, and wherein the propulsion devices arranged in the stern starboard position and in the stern port position of the floatable liferaft have a non-level stern propulsion direction pointing away from the water surface when the floatable liferaft is in forward motion to oppose drag effects.

13. The inflatable floatable liferaft according to claim 11, wherein the non-level bow and stern propulsion directions may be controlled automatically or by a user as a function of the speed of the floatable liferaft.

14. The inflatable floatable liferaft according to claim 8, wherein the propulsion device is arranged within a protecting shell.

15. The inflatable floatable liferaft according to claim 1, further comprising a plurality of protecting shells.

16. The inflatable floatable liferaft according to claim 1, wherein a ballast extending in the longitudinal direction is arranged below and attached to the inflatable non-rigid floatation tubes in the longitudinal direction.

17. The inflatable floatable liferaft according to claim 1, wherein seating arrangements are arranged on the air side of the non-rigid bottom element.

18. The inflatable floatable liferaft according to claim 1, wherein seating arrangements are arranged on the air side of the non-rigid bottom element between two neighbouring floating tubes.

19. The inflatable floatable liferaft according to claim 1, wherein the inflatable tubes are made of a polymeric material, such as natural rubber, polyurethane, thermoplastic poly urethane, butyl rubber, polyvinylchloride, polychloroprene, polyethylene, or a combination thereof.

20. The inflatable floatable liferaft according to claim 1, wherein the inflatable floatable liferaft preferably has an aspect ratio between length and width above 3:

2, and more preferably above 7;

4, and even more preferably above 2;

1.

21. The inflatable floatable liferaft according to claim 1, wherein the inflatable floatable liferaft has a capacity of at least 150 persons, and more preferably more than 200 persons, and even more preferably more than 300 persons.

22. The inflatable floatable liferaft according to claim 1, wherein the inflatable floatable liferaft preferably has a dimension of the inflatable floatable liferaft above 10 metres in length and 6 metres in width, and more preferably above 12 metres in length and 7 metres in width, and even more preferably above 14 metres in length and 8 metres in width.

23. The inflatable floatable liferaft according to claim 1, wherein the inflatable floatable liferaft preferably has a floating capacity of more than 10,000 kilos, and more preferably more than 20,000 kilos, and even more preferably above 30,000 kilos in weight.