Stabilized survival raft

Abstract

A stabilized life raft utilizing a fluid filled depending buoy chamber for overall stabilization and including as improved features thereon a peripheral skirt chamber which fills with the raft supporting fluid upon deployment of the raft and serves as a temporary stabilizer while the buoy chamber becomes filled. The buoy chamber includes baffles to impede the flow of the stabilizing fluid from one portion of the chamber to another in the event of a sudden weight shift within the raft. An improved valve permits a more rapid inward flow of fluid upon deployment of the raft and yet prevents outward flow in instances where the buoyant raft is suddenly thrust upwardly by elements such as waves. The raft, because of the particular placement of the various structural elements in conjunction with the placement of the survival gear and inflation system, is automatically self-righting.

What is claimed is: 
     
       1. A greatly improved device for assisting in the saving of lives at sea including a platform capable of supporting humans, said platform maintained in a stable upright floating condition by a buoyant peripheral flotation structure and .[.an attached main stabilizing chamber extending around the periphery of the flotation structure,.]. .Iadd.a substantially closed, pendulous main stablizing chamber secured to the flotation structure .Iaddend.said chamber designed to be filled with the supporting fluid when the device is in use, the improvement comprising: a. .[.a circumferential.]. sheet means secured to the buoyant peripheral flotation structure at a point spaced from the attachment of the .Iadd.main .Iaddend.stabilizing chamber and extending downwardly therefrom, said sheet .Iadd.means .Iaddend.being secured to the main stabilizing chamber distally from the flotation structure thus forming a peripheral chamber, and   b. openings in the wall of the .[.circumferential.]. sheet means whereby the peripheral chamber quickly fills with the supporting fluid and serves as a stabilizer until the main chamber fills with fluid.   
     
     
       2. A stablized life raft having a peripheral, inflatable member supporting a floor spanning the interior .[.distance.]. .Iadd.dimension .Iaddend.of the raft and a stabilizing chamber defined by the floor of the raft and a wall structure spaced from said floor, a peripheral trough surrounding said chamber, said trough filling with the supporting fluid and providing temporary stabilization during the filling of the main chamber, said chamber being filled with the supporting fluid when in use and means separating the stablizing chamber into communicating sections permitting controlled fluid flow between the .[.chambers.]. .Iadd.sections .Iaddend.to assure stability even though the weight in the raft shifts. 
     
     
       3. A device as in claim 1 wherein the stabilizing chamber includes at least one baffle means extending across the chamber to impede the flow of fluid in the event of a rapid shifting of relative position of the device. 
     
     
       4. A device as in claim 3 wherein the baffle means includes a plurality of intersecting flexible elements including openings to permit the restricted flow of fluid therethrough. 
     
     
       5. A device as in claim 1 and further including a plurality of flexible resilient elements sewn within the walls of the chamber, said elements being coiled in a compact configuration when the device is stored and expanding to a large circular loop when the device is in use. 
     
     
       6. A device as in claim 1 and further including a one way valve in the lower portion of the stabilizing chamber. 
     
     
       7. A device as in claim 6 wherein the one way valve comprises a plurality of similar interconnected overlapping valve elements permitting a greater opening for inflow and yet a reliable restriction upon the outflow of fluid. 
     
     
       8. A life saving device for use upon a fluid such as water comprising a buoyant platform of a size and buoyancy to support a human body, said platform including a protective canopy structure to shield an occupant of the platform from the elements, access means to the interior of said canopy by an inwardly opening door, means securing the door to the canopy capable of rapid securement and release and opening means secured to the door, extending from the upper corner of the door interior of the canopy to the exterior of the canopy adjacent the lower edge of the door whereby the door may be opened by a person in the water by a single tug upon the opening means whereby a person suffering from exposure and having lost control of small muscles is still able to gain entrance to the canopy. 
     
     
       9. A life saving device as in claim 2 wherein the stabilizing chamber includes a multi-sectional one-way valve to control the fluid flow. .Iadd. 
     
     
       10.  A greatly improved device for assisting in the saving of lives at sea, including a platform capable of supporting humans, said platform maintained in a stable, upright floating condition by a buoyant peripheral flotation structure, and a substantially closed main stabilizing chamber secured to the flotation structure, said chamber defined by a bottom of the platform and a first sheet means depending therefrom, said sheet means including openings to permit entry of the supporting fluid, said chamber designed to be filled with the supporting fluid when the device is in use, the improvement comprising: second sheet means secured to the buoyant peripheral flotation structure at a point spaced from the attachment of the main stabilizing chamber and extending downwardly therefrom, said second sheet means being secured to the main stabilizing chamber distally from the flotation structure thus defining a peripheral chamber, at least one opening in the wall of the second sheet means and between the peripheral chamber and the main chamber whereby the peripheral chamber quickly fills with the supporting fluid and serves as a stabilizer until the main chamber fills with fluid. .Iaddend. .Iadd.11. A stablized life raft having a peripheral, inflatable member supporting a floor spanning the interior dimension of the raft and a main stabilizing chamber defined by the floor of the raft and a wall structure below said floor, a peripheral trough surrounding said chamber and in fluid communication therewith, said trough filled with the supporting fluid and providing temporary stabilization during the filling of the main chamber, said chamber being filled with the supporting fluid when in use, and means separating the stabilizing chamber into communicating sections and permitting controlled fluid flow between the sections to assure stability even though the weight in the raft shifts. .Iaddend. .Iadd.12. A device for assisting in the saving of lives in a body of water such as the ocean, comprising:   a platform capable of supporting humans, said platform supported by a buoyant peripheral flotation structure;   a main stabilizing chamber secured to the flotation structure, said chamber defined by the bottom of the platform and a first sheet means depending from the peripheral flotation structure and having at least one opening therein through which water passes from the body of water into the main stabilization chamber, said chamber being designed to be filled with water to form a depending pendulous structure when the device is in use; and   a second sheet means secured to the buoyant peripheral flotation structure at a point spaced from the attachment of the main stabilizing chamber and extending downwardly therefrom, said second sheet means being interconnected to the main stabilizing chamber display from the flotation structure thus defining a peripheral chamber, said second sheet means having at least one opening to permit fluid flow through said second sheet means, and said first sheet means having at least one opening to permit fluid flow between the peripheral chamber and the main chamber;   whereby the peripheral chamber fills quickly with water when the flotation structure inflates. .Iaddend.