Means for mounting a diaphragm in an accumulator-reservoir device

An accumulator-reservoir device including a beaded diaphragm, wherein a housing defining the walls of said device is comprised of separable sections opposing ends of which have a mating configuration forming a gland to receive the diaphragm bead, a relative approaching motion of the housing sections confining the diaphragm bead in said gland under pressure to achieve a sealing contact with plural gland faces and there being an annular opening from said gland through which a portion of the diaphragm wall adjacent to said bead extends, opposing ends of said housing sections terminating in laterally offset projecting generally cylindrical lips received one within another in a radially spaced concentric relation to define a gland of rectangular configuration having angularly related interior faces, said annular opening separating a first face on the outer periphery of a radially inwardly positioning one of said lips and a second face on the housing section terminating in a radially outwardly positioning one of said lips, said first face inclining from the extremity of said inwardly positioning lip toward the common axis of said cylindrical lips and said second face declining out of a plane perpendicular to said common axis.