SLEEPING PAD WITH DUAL COATED BOTTOM SHEET AND CENTRAL LAYER

Abstract

An inflatable sleeping pad or air mattress comprises an inflatable pad having a top layer and a bottom layer. At least one middle layer is disposed parallel to the top and bottom layers, and supported between the top layer and the bottom layer by a plurality of support baffles, wherein a first plurality of support baffles is disposed between the at least one middle layer and the top layer, and a second plurality of support baffles disposed between the at least middle one layer and the bottom layer. The sleeping pad further comprises an air inlet/outlet valve disposed on at least one of the inflatable pad top or bottom layers.

Claims

1. An inflatable sleeping pad comprising: an inflatable pad having a top layer and a bottom layer, said top and bottom layers disposed parallel to one another and having a length and a width; a middle layer constructed of a first material having a length and a width and disposed between and parallel to said top and bottom layers, and wherein said middle layer is supported between the top layer and the bottom layer, and wherein said middle layer includes a plurality of openings; and a plurality of support baffles, a first plurality of support baffles disposed between the middle layer and the top layer, and a second plurality of support baffles disposed between the middle layer and the bottom layer, and wherein predetermined regions of said first plurality of truss baffles are welded at predetermined points directly to predetermined regions of said second plurality of truss baffles through said plurality of openings in said middle layer.

2. The inflatable sleeping pad according to claim 2, wherein the first and second plurality of support baffles are truss support baffles, attached at predetermined locations between the top layer, the middle layer, and the bottom layer.

3. The inflatable sleeping pad according to claim 3, wherein said first and second plurality of truss support baffles are made of a heat weldable material and are spot welded at predetermined locations between the top layer, the middle layer, and the bottom layer.

4. The inflatable sleeping pad according to claim 4, wherein said top and bottom layers each include an interior facing surface, and wherein each of said interior facing surfaces of said top and bottom layers include at least a plurality of heat weldable regions.

5. The inflatable sleeping pad according to claim 2, wherein said at least one middle layer is not heat weldable.

6. The inflatable sleeping pad according to claim 2, wherein the at least one middle layer is constructed of a thermal energy reflective material.

7. The inflatable sleeping pad according to claim 9, wherein the middle layer is a mylar coated aluminum sheet.

8. The inflatable sleeping pad according to claim 2, wherein the bottom layer is coated with polyurethane on at least predetermined regions of an inner surface and generally entirely on an outer surface thereof.

9. An inflatable sleeping pad comprising: an inflatable pad having a top layer and a bottom layer, said top and bottom layers disposed parallel to one another and having a length and a width, wherein said top and bottom layers each include an interior facing surface, and wherein each of said interior facing surfaces of said top and bottom layers include at least a plurality of heat weldable regions; at least one middle layer constructed of a thermal energy reflective material having a length and a width and disposed parallel to said top and bottom layers, and wherein said at least one middle layer is supported between the top layer and the bottom layer and comprises a plurality of openings; and a plurality of truss support baffles constructed of a heat weldable material, a first plurality of truss support baffles disposed between the at least one middle layer and said interior facing surface of the top layer, and a second plurality of truss support baffles disposed between the at least middle layer and the interior facing surface of the bottom layer, wherein said first and second plurality of truss support baffles are spot welded at predetermined locations between the top layer, the middle layer, and the bottom layer, and wherein predetermined regions of said first plurality of truss baffles are welded at predetermined points directly to predetermined regions of said second plurality of truss baffles through said plurality of openings in said at least one middle layer.

10. The inflatable sleeping pad according to claim 17, wherein the middle layer is a mylar coated aluminum sheet.

11. The inflatable sleeping pad according to claim 17, wherein the first plurality of baffles is spot welded between the top layer and the middle layer, and the second plurality of baffles is spot welded between the middle layer and the bottom layer.

12. The inflatable sleeping pad according to claim 17, wherein the bottom layer is coated with a polyurethane coating on an inner surface and an outer surface thereof.

13. The inflatable sleeping pad according to claim 17, wherein the first plurality of baffles is spot welded between the top layer and the middle layer, and the second plurality of baffles is spot welded between the middle layer and the bottom layer.

14. An inflatable sleeping pad comprising: an inflatable pad having a top layer and a bottom layer, said top and bottom layers disposed parallel to one another and having a length and a width, wherein said top and bottom layers each include an interior facing surface, and wherein said interior facing surface of said top layer includes at least a plurality of heat weldable regions, and wherein the interior facing surface of said bottom layer is coated with a polyurethane coating on said interior facing surface and on an outer surface thereof; a middle layer constructed of a thermal energy reflective material having a length and a width and disposed parallel to said top and bottom layers, and wherein said middle layer is supported between the top layer and the bottom layer and comprises a plurality of openings; and a plurality of truss support baffles constructed of a heat weldable material, a first plurality of truss support baffles disposed between the at least one middle layer and the interior facing surface of said top layer, and a second plurality of truss support baffles disposed between the at least middle layer and the interior facing surface of said bottom layer, wherein said first and second plurality of truss support baffles are spot welded to each other at predetermined locations between the top layer, the middle layer, and the bottom layer, and wherein said first plurality of truss baffles are welded at predetermined points directly to said second plurality of truss baffles through said plurality of openings in said middle layer.

15. An inflatable sleeping pad comprising: a top layer; a bottom layer; a middle layer disposed between the top layer and the bottom layer and having a plurality of openings extending therethrough; a first plurality of truss baffles disposed between the top layer and the middle layer, each of said first plurality of truss baffles having a first predetermined welding point and a second predetermined welding point spaced from the first predetermined welding point; and a second plurality of truss baffles disposed between the middle layer and the bottom layer, each of said second plurality of truss baffles having a first predetermined welding point and a second predetermined welding point spaced from the first predetermined welding point; wherein said top layer, bottom layer, and middle layer are arranged substantially parallel to one another; wherein the first predetermined welding spots of the first and second plurality of truss baffles are welded to the top and bottom layers, respectively; and wherein each second predetermined welding spot of each of the first plurality of truss baffles is welded to a second predetermined welding spot of a second truss baffle through an opening of the middle layer.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0014] These and other features and advantages of the present invention will be better understood by reading the following detailed description, taken together with the drawings wherein:

[0015] FIG. 1 illustrates a double layer pad construction providing an additional weld at the center of the pad that joins the top and bottom baffle fabrics; and

[0016] FIG. 2 illustrates an inflatable pad having a bottom sheet of fabric that is coated on both sides with polyurethane to facilitate field repairs and internal welding.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] Closely related to an air mattress, an inflatable pad requires an external pressure source to inflate, typically in the form of a pump or by blowing orally. Convection of the air inside the mattress from a bottom surface typically against a cold and/or wet ground to the top surface against which a user sleeps reduces the amount of insulation the air mattress provides. One method of reducing convection is by partitioning the internal cavity between the top and bottom sheets or by filling the cavities with material to trap the air such as down feathers or synthetic insulation. Manually inflated pads have the advantage of offering good thickness and a great deal of comfort while being lightweight and able to pack to a small size.

[0018] Accordingly, the feature of the present invention is a construction technique for inflatable sleeping pads 50 and the like which provides one or more additional sheet 26 at the center of the pad that joins the top 20 and bottom 22 sheets to a series of internal baffles 24, 28, see FIG. 1, in order to stop or lessen convection that would tend to make the pad less effective at insulating the user from cold, damp surfaces on which the air mattress 50 is placed. The purpose of the center weld is to create a structure that can support an additional layer of material 26 in the center of the pad. One possible construction consist of 3 layers of coated mylar; a top layer 20 supported by baffles 28; a central layer 26 supported in the center of the pad or mattress 50 by both a top baffle layer 28 and a bottom baffle layer 24; and a bottom layer 22 of the pad held in place by bottom baffles 24 welded to the interior surface 30 of the bottom sheet 22. The purpose of this construction is to create smaller air cells within the pad to reduce convective heat transfer and to add an additional layer of IR reflective material (central layer 26) to reduce radiant heat loss from the user to the surface on which the air mattress or pad is placed.

[0019] An additional feature of this embodiment of the present invention features providing a bottom sheet of fabric 22 on an inflatable air pad or the like, that is coated on both sides (interior and exterior) with polyurethane, FIG. 2. The inside facing surface 30 is coated with polyurethane either in its entirety or at least in selected predetermined areas to facilitate welding to the baffles 24 while the outside facing surface 32 is coated generally entirely to facilitate field repair of punctures with a quick curing self-adhesive patch. A repair of a standard vinyl air pad that is not coated with polyurethane or a similar substance takes about 24 hours to cure and be usable. However, a standard repair kits such as tear-aid brand patches reach 80% of their full strength in just minutes making the pad usable almost immediately and certainly that night.

[0020] The sleeping pad 50, in accordance with an embodiment of the present invention, is described in more elaboration hereinafter with respect to FIGS. 1 and 2. The inflatable sleeping pad 50 comprises an inflatable pad having a top layer 20 and a bottom layer 22, wherein the top and bottom layers 20, 22 are disposed parallel to one another and have a length and a width. The sleeping pad 50 further comprises at least one middle layer 26 constructed of a first material having a length and a width and disposed parallel to the top and bottom layers 20, 22. The middle layer 26 is supported between the top layer and the bottom layer 20, 22. The sleeping pad further comprises a plurality of support baffles, wherein a first plurality of support baffles 28 is disposed between the at least one middle layer 26 and the top layer 20, and a second plurality of support baffles 24 is disposed between the at least middle one layer 26 and the bottom layer 22. The sleeping pad 50 further comprises an air inlet/outlet valve 34 disposed on at least one of the inflatable pad top or bottom layers.

[0021] In one embodiment, the first and second plurality of support baffles 24, 28 are truss support baffles, attached at predetermined locations between the top layer 20, the middle layer 26, and the bottom layer 22. In one example, the first and second plurality of truss support baffles are made of a heat weldable material and are spot welded at predetermined locations between the top layer 20, the middle layer 26, and the bottom layer 22.

[0022] In a non-limiting embodiment, the top and bottom layers 20, 22 each include an interior facing surface, and wherein each of the interior facing surfaces of the top and bottom layers include at least a plurality of heat weldable regions. Furthermore, the at least one middle layer 26 includes a plurality of openings 25. Predetermined regions of the first plurality of truss baffles 28 are welded at predetermined points directly to predetermined regions of the second plurality of truss baffles 24 through the plurality of openings 25 in the at least one middle layer 26.

[0023] In an alternative embodiment, the at least one middle layer 26 may be heat weldable and therefore may not include a plurality of openings. The at least one middle layer 26 is preferably constructed of a thermal energy reflective material. In one example, the middle layer 26 is a mylar coated aluminum sheet and thus not heat weldable and therefore the provision of a plurality of openings 25 facilitates the welding of first and second trusses 24, 28 directly to one another through the openings.

[0024] Accordingly, the present invention provides a novel and nonobvious air mattress including the features of a bottom layer having polyurethane coating on both the interior and exterior surfaces to facilitate heat welding to the interior surface of the bottom layer and tear or puncture repair on the exterior surface of the bottom layer. One or more middle layers, preferably heat reflective layer, is provided in the Central region of the air mattress and supported by first and second layers of trusses which suspend or support the middle layer between the bottom layer and the top layer, to reduce convective air currents within the interior of the air mattress thereby preventing heat from a user's body from escaping to the ground or other cold surface on which the air mattress is placed.

[0025] Modifications and substitutions by one of ordinary skill in the art are considered to be within the scope of the present invention, which is not to be limited except by the allowed claims and their legal equivalents.