Control fold liquid expulsion bladder

Claim 2

A liquid expulsion device comprising: a cylindrical hollow container, a support structure longitudinally disposed within said container, said support structure forming at least a concave wall paralleling the axis of said container, said concave wall and a portion of an inner wall of said container together forming an open bay which is symmetrical about a median plane, and a collapsible bladder formed to nest within said bay, said bladder having a first wall with a varying wall thickness from thin to thick from a central area to edge areas thereof and a second wall of a constant wall thickness integral with and opposite to said first wall, said bladder when subjected to a source of external pressure being caused to buckle in a radial direction starting at the thinnest section of said first wall propagating towards the thicker section, thereby causing said first wall to fold against said second wall in a controlled manner to expel liquid contained in said bladder.

Claim 3

The invention as set forth in claim 1 further comprising: means to connect the volume between the inner periphery of said container and the outer periphery of the bladder to said source of external pressure, said pressure being produced by gas, the gas being directed into said container between the inner wall of said container and the outer wall of said bladder to cause said bladder to buckle in a radial direction.

Claim 4

The invention as set forth in claim 1 wherein said first wall of said bladder is comprised of stepped sections having longitudinally extending ridges separating said sections, each successive section being thicker in cross-section as the wall descends from the apex of said bladder.

Claim 5

The invention as set forth in claim 3 wherein said bladder is comprised of aluminum, said aluminum being chemically milled forming said stepped sections.

Claim 6

The invention as set forth in claim 1 wherein said support structure forms three longitudinally extending bays, each of said bays containing bladders from 105* to 120* apart.

Claim 7

The invention as set forth in claim 1 further comprising a second cylindrical hollow container independent of and concentric with said first mentioned container, said second container being housed within said support structure of said first container, the second container having a support structure longitidinally disposed within the container, wherein an open bay is formed symmetrical about a median plane between said support structure and said second container which nests therein, a collapsible bladder having a varying wall thickness for the purpose of expelling a second liquid contained within said second container when said bladder is subjected to a source of external pressure.

Claim 8

A liquid expulsion device comprising: a cylindrical hollow container, a support structure longitudinally disposed within said container, said support structure forming three concave walls from 105* to 120* apart paralleling the axis of said container, each of said concave walls together with a portion of the inner wall of said container forming a bay which is symmetrical about a median plane, said inner wall of said container and said concave walls of said support structure forming three open bays, a collapsible bladder formed to nest within each of said bays, said bladder having a first wall with a varying wall thickness from thin to thick from a central area to edge areas thereof and a second wall of constant wall thickness integral with and opposite to said first wall, and means to connect the volume between the inner periphery of said container and the outer periphery of the bladder to a source of gas pressure, said gas pressure being directed into said container between the inner wall of said container and the outer wall of said bladder to cause said bladder to buckle radially inwardly starting at the thinnest section of said first wall propagating towards the thicker section thereby causing said first wall to fold against said second wall in a controlled manner to expel liquid contained in said bladder.

Claim 9

A liquid expulsion device comprising: a cylindrical hollow container, a support structure longitudinally disposed within said container, said support structure forming three concave walls from 105* to 120* apart paralleling the axis of said container, each of said concave walls together with a portion of the inner wall of said container forming a bay which is symmetrical about a median plane, said inner wall of said container and said concave walls of said support structure forming three open bays, a collapsible bladder formed to nest within each of said bays, said bladder having a first wall with a varying wall thickness from thin to thick from a central area to edge areas thereof and a second wall of constant wall thickness integral with and opposite to said first wall, and means to connect the volume between the inner periphery of said container and the outer periphery of the bladder to a source of gas pressure, said gas pressure being directed into said container between the inner wall of said container and the outer wall of said bladder to cause said bladder to buckle radially inwardly starting at the thinnest section of said first wall propagating towards the thicker section thereby causing said first wall to fold against said second wall in a controlled manner to expel liquid contained in said bladder.

Claim 10

A liquid expulsion device comprising: a hollow container, a collapsible bladder within sad container, said bladder having at least one bladder wall with a varying wall thickness from thin to thick from a central area to edge areas thereof, said bladder wall being positioned adjacent an inner wall in said hollow container, said bladder when subjected to a source of external pressure being caused to buckle inwardly starting at the thinnest section propagating towards the thicker section thereby causing said bladder wall to fold in a controlled manner against an opposite inner wall of said container to expel liquid contained in said bladder.

Claim 11

A liquid expulsion device comprising: a hollow container, a collapsible bladder within sad container, said bladder having at least one bladder wall with a varying wall thickness from thin to thick from a central area to edge areas thereof, said bladder wall being positioned adjacent an inner wall in said hollow container, said bladder when subjected to a source of external pressure being caused to buckle inwardly starting at the thinnest section propagating towards the thicker section thereby causing said bladder wall to fold in a controlled manner against an opposite inner wall of said container to expel liquid contained in said bladder.

Claim 12

The invention as set forth in claim 8 further including an internal support structure within said container and forming said opposite inner wall, said opposite inner wall being concave in curvature, said bladder having a second bladder wall of greater stiffness than said bladder wall of varying wall thickness, said second bladder wall being integral with said first bladder wall and nesting within the opposite concave inner wall, said inner wall together with said opposite inner wall forming a bay which is symmetrical about a median plane.