Low cost accumulator device

As a new article of manufacture a low cost light weight hydraulic accumulator device comprising a unitary metallic shell defining a pressure vessel, said shell including a spherical reservoir, a generally cylindrical neck portion extending from said reservoir, said neck portion including a radially outwardly extending flange, a rim extending downwardly from said flange in the direction of the axis of said neck portion, a stop shoulder extending radially from said rim portion, a rigid hollow generally cylindrical casing extending into said reservoir, said casing including throughgoing perforations, a radially directed flange on said casing having an upper surface engaging said stop shoulder and a lower surface, a mounting fixture including an oil port supported in said neck portion, said fixture having a downwardly facing base portion and an upper surface portion engaging said lower surface of said flange of said casing, inturned portions of said neck portion underlapping said base portion of said fixture to clampingly support said fixture and the flange of said casing between said stop shoulder and inturned portions, and a resilient distensable generally cylindrical elastomeric bladder member disposed over said casing and dividing said reservoir into two chambers, said bladder member having a thickened rim portion defining a mouth, said bladder including portions disposed in an annular space defined between said neck and said casing, said thickened rim portion being clamped in an axially compressed condition between said flange of said neck and said upper surface of said flange of said casing to thereby define a seal between said casing and said vessel at said neck portion.