Patent ID: 7887304

Claim:
A method of preventing water from leaking in a diaphragm type pressurized pump, comprising the steps of: providing a motor and a plurality of wobble plates driven by said motor, each wobble plate including a threaded hole formed therein; providing a diaphragm sheet having a plurality of piston acting regions corresponding respectively to the plurality of wobble plates, each piston acting region including a hollow cylinder formed on a top surface of the piston acting region and corresponding to a respective threaded hole; disposing a plurality of piston head pushing chunks respectively on the piston acting regions such that a ladder hole formed in each piston head pushing chunk receives a respective hollow cylinder, the hollow cylinders protruding upwardly from the piston head pushing chunks, each ladder hole having a flange member formed at a bottom portion of the ladder hole; driving a fixing screw through the ladder hole in each piston head pushing chunk and a center hole in each hollow cylinder such that the fixing screw engages the threaded hole in the wobble plate; causing the hollow cylinder to deform as the fixing screw in driven such that an upper portion of the hollow cylinder is sandwiched between a bottom surface of a head of the fixing screw and the flange member of the ladder hole to seal the threaded hole from water.