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Reduced energy and volume air pump for a seat cushion

  • US 5,657,499 A
  • Filed: 01/11/1996
  • Issued: 08/19/1997
  • Est. Priority Date: 01/11/1996
  • Status: Expired due to Term
First Claim
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1. A pump system comprising:

  • at least one pair of inflatable bladder means within a cushion to support a body having sufficient weight to compress the bladder means;

    a reversible pump connected to drive means, the pump comprising a piston within a cylinder, the piston being moved within the cylinder by the drive means and defining a first chamber section within the cylinder on one side of the piston and a second chamber within the cylinder on the other side of the piston;

    first fluid conduit means connecting one bladder means of the pair of bladder means to the first chamber section;

    second fluid conduit means connecting the other bladder means of the pair of bladder means to the second chamber section; and

    two valve means disposed respectively within the first and second chamber sections near the distal end of the travel of the piston within a chamber that open and equalize the pressure across the piston when the piston reaches the valve means.

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