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Convective cushion with positive coefficient of resistance heating mode

  • US 20090126110A1
  • Filed: 01/06/2009
  • Published: 05/21/2009
  • Est. Priority Date: 09/13/2005
  • Status: Active Grant
First Claim
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1. A convective cushion comprising:

  • a plenum defined by a laterally extending bottom surface and a laterally extending top surface secured around a perimeter extending transversely therebetween to contain an open air space, an air flow structure formed of flexible open cell material disposed in the air flow space, said air flow structure spacing the top surface from the bottom surface, said top surface adapted for convective air flow delivered from said air flow structure over substantially the entire top surface responsive to a flow of air blown laterally through said plenum, said top surface being sufficiently impervious to air to retain greater air pressure within the air flow space, said air flow structure maintaining a substantial portion of said flow of air within a venting air flow in a coplanar direction laterally between said top and bottom surfaces to be directed laterally outward through said plenum proximate said perimeter, a portion of the flow of air venting through said top surface;

    a power unit in fluid communication with the plenum, and housing a blower in fluid communication with a heating element;

    a controller unit in communication with the blower and heating module;

    whereby a user resting atop the cushion is able to control the blower and heating module to deliver air of a desired temperature and quantity into the cushion to said air flow structure, to deliver said air of desired temperature and quantity to said top surface producing the convective air flow over substantially the entire top surface.

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