Arrangement of connecting a diaphragm with an actuator rod in a diaphragm-operated device

Claim 1

A diaphragm-operated pump comprising a pump body; a diaphragm formed of elastic material and dividing the hollow interior of said pump body into a pump chamber having an inlet port and an outlet port and an atmospheric chamber, said diaphragm having a movable central portion with a connection boss formed thereon, said connection boss having a blind bore and an annular projection extending radially inwardly from the inner periphery of said blind bore; an actuator rod fitted in said blind bore for elastic engagement therewith having one end portion extending into said blind bore, said one end portion having an annular recess receiving the inwardly extending projection; a retainer fitted over the outer periphery of said connection boss for restraining deformation of said connection boss, said retainer including a cylinder portion fitted over the outer periphery of the connection boss for restraining radially expansive deformation of the boss and a flange portion integrally extending from the cylinder portion in a radially outward direction with its one side surface abutting against the diaphragm; and spring means for urging said retainer against said diaphragm, the other side surface of said flange portion supporting one end of said spring means.