Claims
- 1. A pillow comprising a top surface, a flexible bottom surface and a compressible filler therebetween, said pillow further including a thin envelope layer intermediate to said surfaces and positioned adjacent said bottom surface below a center plane running between said surfaces, said envelope layer being adapted to sealably receive a fluid-like material therein isolated from said top surface by said compressible filler, said envelope being secured within said pillow to maintain a position overlying said bottom surface, the uncompressed volume of said compressible filler being at least several times greater than the in use volume of said envelope, said pillow being readily deformable when a load is applied to said top or bottom surface.
- 2. A pillow as claimed in claim 1 wherein said envelope is sloped across the pillow front to back with the envelope adjacent the front being elevated.
- 3. A pillow as claimed in claim 2 wherein said envelope is spaced from said bottom surface by a foam member which serves to dispose said envelope at said slope and wherein said envelope is secured about the periphery thereof to a bottom surface of the pillow.
- 4. A pillow as claimed in claim 3 wherein said foam member is wedge shaped.
- 5. A pillow as claimed in claim 1 wherein said envelope is additionally separated from a front edge of said pillow by compressible filler material maintained in a separate pocket within said pillow at said front edge to avoid rearward displacement of the material.
- 6. A pillow as claimed in claim 1 wherein said envelope is separated from said bottom surface by a thermal reflecting material to partially isolate the envelope.
- 7. A pillow as claimed in claim 1 wherein said envelope adjacent said bottom surface includes an accessible closable inlet through which water or other flowable fluid can be introduced into said envelope whereafter said inlet is closed.
- 8. A pillow as claimed in claim 1 wherein said envelope is attached to said bottom surface generally about the perimeter of said envelope.
- 9. A pillow as claimed in claim 1 wherein said envelope is partially filled with water such that localized depression causes a portion of the water in the region of the localized depression to be displaced.
- 10. A pillow comprising a flexible top surface and a flexible bottom support surface and at least several inches of compresible fiber fill material captured therebetween, both top and bottom surfaces being of a fabric material, a liquid retaining envelope positioned adjacent said bottom surface and secured relative to said bottom surface to maintain a thin profile when said bottom surface is generally flat, said liquid retaining envelope being positioned below a center plane passing between said bottom surface and said top surface, said envelope being thin and only partially filled such that in a horizontal position the envelope would have an average depth of less than about half of an inch to an inch, said envelope being spaced from said top surface by said fiber fill which acts as an insulator reducing heat transfer between said top surface and said envelope, said pillow being readily deformable from all surfaces when said bottom surface is generally horizontal.
- 11. A pillow as claimed in claim 10 wherein said envelope is of a plastic material having a heat fused seal adjacent the periphery thereof and a securing flange beyond said seal, said flange being physically attached to said bottom surface to urge said envelope to maintain a thin profile when said pillow is supported on the bottom surface in a horizontal orientation.
- 12. A pillow as claimed in claim 11 wherein said flange is secured by stitching to said bottom surface.
- 13. A pillow as claimed in claim 12 wherein said envelope includes a reclosable inlet accessible through a port provided in said bottom surface whereby the amount of fluid within said envelope may be varied by the user to modify the properties of the pillow in accordance with the user's requirements.
- 14. A pillow as claimed in claim 13 wherein said envelope is slightly spaced from said bottom surface and normally disposed at an angle such that the forward edge of the envelope is elevated.
- 15. A pillow as claimed in claim 10 including means at the front of the pillow for maintaining a pocket of fill material at the front of said pillow.
- 16. A pillow as claimed in claim 15 wherein said means at the front of the pillow is a separate partition secured to the pillow casing.
- 17. A pillow comprising a thin fluid retaining envelope at a bottom, flexible surface of the pillow, about 3 to 4 inches of a suitable compressible filler material above said envelope and in front thereof, said envelope and said filler all being retained in position due to securement with or confinement by a pillow casing, said compressible filler material being essentially supported on a displaceable liquid layer within said envelope having an average depth of less than about one inch, said compressible filler material providing a compressible means for distributing the load to said envelope and increase the area of support of the envelope when a load is applied to the top of said pillow when said pillow is supported on a generally horizontal bed surface, said envelope including securing means attached to said pillow to maintain a thin profile of said envelope above and adjacent said bottom surface, below a center plane running between the top and bottom surfaces of the pillow.
FIELD OF THE INVENTION
This application is related to United States Application Ser. No. 845,898 now abandoned.
The present invention relates to water filled pillows and particularly, pillows having a water envelope preferably for use on a flat surface such as a bed, cot or the like. In particular, the invention relates to a pillow having an envelope layer adjacent the bottom surface thereof separated from the top surface by a compressible filler material.
Various seat supports have been proposed which make use of a fluid envelope where the fluid is displaced or partially displaced as a person sits upon the pillow. It is also known to combine the water envelope with an outer envelope, which preferably has compressed air, where this outer area acts as a border and protects against leakage should puncture occur to the inner envelope.
Other pillow arrangements are known where the water envelope is placed centrally within a pillow with a compressible layer top and bottom thereabout. This symmetrical arrangement provides the water envelope with a greater range of deformation and uncertainty with respect to the in use configuration of the water envelope.
The following references show various prior art structures:
U.S. Pats. Nos. 2,822,544, 3,251,075, 2,612,645, 2,691,179, 2,748,399, 3,702,484, 3,736,604, 4,292,702, 4,389,742, 2,942,281, 3,983,587, 3,251,075, 3,722,012, 4,247,963, 4,656,681.
According to the present invention, a pillow comprises a top surface, a bottom surface and a compressible filler therebetween with a thin envelope layer intermediate the pillow and adjacent the bottom surface offset from the center plane running between the top and bottom surfaces. The envelope layer is adapted to sealably receive a fluidlike material therein and the compressible filler serves to isolate the thin envelope from the top surface.
According to an aspect of the invention, the envelope is disposed at an angle to slope from front to back within the pillow such that the envelope adjacent the front of the pillow is elevated. By so disposing the envelope, initial compression of the bed and the pillow brings the envelope to a more or less horizontal position and as such, the envelope initially moves towards a horizontal position during compression, rather than merely move away from the horizontal position if the envelope was not so disposed.
US Referenced Citations (11)
Non-Patent Literature Citations (1)
| Entry |
| "Liberty" An Ad on Page 87 of the Flotation Sleep Industry Magazine, Jun. 1982 Issue. |
Patent Grant
4847931
