Abstract: A diaphragm assembly for a fluid driven diaphragm pump includes a piston having an inflexible core. This core includes a hub with a plate extending radially from about the periphery of the hub. The piston further includes a unitary diaphragm body molded with the inflexible core in situ. The unitary diaphragm body has a plurality of connective tendons extending through the plate. A thermoplastic coating extends about the inflexible core between the core and the molded unitary diaphragm body having a thermally miscible surface with the thermoplastic coating. An inflexible backing plate extends in juxtaposition with the diaphragm.

Abstract: A diaphragm assembly designed for employment in a fluid driven diaphragm pump includes a piston having an inflexible core. This core includes a hub with a plate extending radially from about the periphery of the hub and a center attachment concentrically arranged in the hub and accessible from a first end of the hub. The plate defines the inflexibility of the piston. The piston further includes a unitary diaphragm body molded with the inflexible core in situ. A peripheral convolute portion outwardly of the piston is integrally molded with the unitary diaphragm body. The unitary diaphragm body has a plurality of connective tendons extending through the plate. A thermoplastic coating extends about the inflexible core between the core and the molded unitary diaphragm body. The unitary diaphragm body is of thermoplastic elastomer having at least a thermally miscible surface with the thermoplastic coating.