Check valve for fluid bladders

Details Check valve for fluid bladders Check valve for fluid bladders

1991-10-28

1992-09-08

Nilson, Robert G.

Beds

Bedclothing

And means to facilitate changing thereof

137223, 137846, 417480, F16K 1516

Patent

active

051447088

ABSTRACT:
A check valve provides a one-way fluid passage from without to within a fluid bladder formed by a pair of plastic sheets sealed together about their periphery. The check valve is formed by a pair of superimposed films of thermoplastic material, generally equal in length, thermally bonded together at predetermined areas to define the fluid passage throughout the length of the valve. Each of the films, adjacent one end thereof, is sealed to one of the outer sheets where the valve enters the bladder by a seal line of wedge shape. Each of the films has a high-gloss, cohesive inner surface and a matte, non-cohesive, outer surface. At least one of the films includes, on its inner surface, a release material disposed at a location which corresponds to the area at the inlet end of the fluid passage through the peripheral seal of the bladder to prevent the fusing together of the films at that area of the seal. The seal in that area has a V-shape with apex pointing in a direction opposite the one-way fluid flow. The terminal ends of the superimposed films extend in surface-to-surface relation into the bladder to provide a "duck-bill" type check valve.

REFERENCES:
patent: 3068494 (1962-12-01), Pinkwater
patent: 3133696 (1964-05-01), Mirando
patent: 4708167 (1987-11-01), Koyanagi
patent: 4917646 (1990-04-01), Kieves
patent: 4930174 (1990-06-01), Hunter
patent: 4966197 (1990-10-01), Jaron

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