Patent ID: 6080685
Filing Date: 2000-06-27
Classification: F04B,F16J,Y10T

Abstract:
An improved fluid pump diaphragm substantially resistant to abrasive wear for use in certain applications in which at least a portion of said diaphragm is in contact with a flange of such fluid pump which would tend to abrade said diaphragm, said diaphragm comprising:(a) a generally flat center portion,(b) a generally arcuately shaped flexure annular portion connected at an inner periphery thereof to an outer periphery of said generally flat portion, said generally arcuate shaped flexure annular portion having a convex surface and a concave surface,(c) an outer edge portion connected at an inner periphery thereof to an outer periphery of said generally arcuately shaped flexure annular portion of said diaphragm for securing said diaphragm to a pump housing, wherein said generally flat center portion, said generally arcuately shaped flexure annular portion and said outer edge portion include at least one layer of a flexible material selected from a group including natural rubber, synthetic rubber, fabric reinforced rubber, plastic and mixtures thereof,(d) an abrasion resistant polymeric material, having a predetermined thickness and a predetermined size, adhered to said generally flat center portion and to a predetermined portion of said convex surface of said generally arcuately shaped flexure annular portion of said at least one layer of said flexible material of said diaphragm, said predetermined size being sufficient to cover that portion of said generally flat center portion and at least said predetermined portion of said convex surface of said generally arcuately shaped flexure portion of said diaphragm that is in contact with such flange of such fluid pump which would tend to abrade said diaphragm, and(e) a central aperture formed in and through said generally flat portion of said diaphragm and said abrasion resistant polymeric material, said central aperture having a predetermined diameter for attaching said diaphragm to a piston rod of such pump.