Pneumatic lift with unidirectional valve

1. A system of inflating or deflating stacked mattresses comprising, in combination:

a unidirectional valve arranged in air flow communication between each of a first inflatable mattress and a second inflatable, said unidirectional valve including a first housing configured to sealingly penetrate a portion of said first inflatable mattress with at least one opening in said first housing communicating with an interior of said first inflatable mattress and a conduit communicating between an interior portion of said first housing and an ambient external environment wherein said first housing includes a central pier having an intermittent free edge, a downwardly projecting annular wall, and two spaced apart, coaxially arranged annular rings that project downwardly from an under surface of said central pier, such that said two spaced apart annular rings are arranged in coaxial relation to said downwardly projecting annular wall and said central pier structurally supports an annular flange with a plurality of struts that extend radially outwardly in circumferentially spaced relation to one another from said free edges and further wherein one of said struts is wider and thicker than other of said struts so as to provide sufficient structural support for said conduit communicating between said interior portion of said first housing and said external ambient environment;

a second housing configured to sealingly penetrate a portion of said second inflatable mattress so as to be in mating relationship with said first housing, said second housing having at least one opening communicating with an interior of said second mattress wherein said second housing includes a plate and an upwardly projecting annular wall arranged on said plate so as to be complementarily positioned with respect to said first housing; and

a resilient diaphragm captured by said first housing so as to isolate said conduit from said interiors of said inflatable mattresses thereby maintaining said interior portion of said first housing at an ambient external pressure during inflation or deflation of said first and second inflatable mattresses.

2. A pneumatic lift comprising:

a first inflatable mattress that defines a first internal chamber;

a second inflatable mattress that defines a second internal chamber, wherein said first inflatable mattress is positioned in overlying relation to said second inflatable mattress so as to define a common region between them; and

a unidirectional valve arranged in air flow communication with each of said first internal chamber and said second internal chamber, said unidirectional valve comprising a first housing sealingly penetrating a portion of said first inflatable mattress with at least one opening in said first housing communicating with said first internal chamber and a pressure-equalization conduit communicating between an interior portion of said first housing and said common region wherein said first housing includes a central pier having an intermittent free edge, a downwardly projecting annular wall, and two spaced apart, coaxially arranged annular rings that project downwardly from an under surface of said central pier, such that said two spaced apart annular rings are arranged in coaxial relation to said downwardly projecting annular wall and said central pier structurally supports an annular flange with a plurality of struts that extend radially outwardly in circumferentially spaced relation to one another from said free edges and further wherein one of said struts is wider and thicker than other of said struts so as to provide sufficient structural support for said conduit communicating between said interior portion of said first housing and said external ambient environment;

a second housing sealingly penetrating a portion of said second inflatable mattress in aligned, mating relationship with said first housing, said second housing having at least one opening communicating with said second internal chamber wherein said second housing includes a plate and an upwardly projecting annular wall arranged on said plate so as to be complementarily positioned with respect to said first housing; and

a diaphragm captured by said first housing so as to isolate said pressure- equalization conduit from said at least one openings in said first and said second housings thereby maintaining said interior portion of said first housing at an ambient pressure defined by said common region during inflation and deflation of said first and second inflatable mattresses.

3. A pneumatic lift comprising:

a first inflatable mattress having a top panel, a bottom panel, and a perimeter band that joins said top panel to said bottom panel so as to define a first chamber;

a second inflatable mattress having a top panel, a bottom panel, and a perimeter band that joins said top panel to said bottom panel so as to define a second chamber, wherein said first inflatable mattress is positioned in overlying relation to said second inflatable mattress such that said bottom panel of said first inflatable mattress confronts said top panel of said second inflatable mattress thereby defining a region between said confronting top panel and bottom panels;

wherein said inflatable mattresses are arranged in internal air flow communication with one another through a unidirectional valve comprising:

a first housing sealingly penetrating said bottom panel of said first inflatable mattress with at least one opening communicating with said first chamber and a pressure-equalization conduit communicating between an interior portion of said first housing and said region between said confronting top panel and bottom panels wherein said first housing includes a central pier having an intermittent free edge, a downwardly projecting annular wall, and two spaced apart, coaxially arranged annular rings that project downwardly from an under surface of said central pier, such that said two spaced apart annular rings are arranged in coaxial relation to said downwardly projecting annular wall and said central pier structurally supports an annular flange with a plurality of struts that extend radially outwardly in circumferentially spaced relation to one another from said free edges and further wherein one of said struts is wider and thicker than other of said struts so as to provide sufficient structural support for said conduit communicating between said interior portion of said first housing and said external ambient environment;

a second housing sealingly penetrating said top panel of said second inflatable mattress in aligned, mating relationship with said first housing, said second housing having at least one opening communicating with said second chamber wherein said second housing includes a plate and an upwardly projecting annular wall arranged on said plate so as to be complementarily positioned with respect to said first housing; and

a biased diaphragm captured by a portion of said first housing so as to isolate said pressure-equalization conduit and said an interior portion of said first housing from said at least one openings in said first and said second housings thereby maintaining said pressure-equalization conduit of said first housing at a common pressure defined by said region during inflation and deflation of said first and second inflatable mattresses.

4. A pneumatic lift according to claim 3 wherein each of said inflatable mattresses comprise a top panel having a peripheral edge and a bottom panel having a peripheral edge with a perimeter band sealed to and extending between said peripheral edges so as to define an internal chamber.

5. A pneumatic lift according to claim 4 wherein said internal chamber houses a plurality of spaced apart transverse baffle-panels that extend between said top panel and said bottom panel.

6. A pneumatic lift according to claim 4 wherein each of said inflatable mattresses is fixedly fastened to an adjacent inflatable mattress.