Patent ID: 7134850
Filing Date: 2006-11-14
Classification: F04B,F05C,F16F

Abstract:
1. A fitted assembly bellows pump for generating a pumping action based on reciprocal movements of an air cylinder portion to thereby suck and discharge a fluid via valves, comprising: a pump body including an in-flow passage and an out-flow passage for the fluid; a pump cylinder formed on one end of said pump body; a bellows formed from a resin and capable of being extended or contracted in said pump cylinder and along a center axis; an air cylinder portion for extending or contracting said bellows; and check valves disposed within the pump body facing a pumping chamber defined by said pump body, pump cylinder and bellows and alternately operative to open and close in conjunction with the extension and contraction of said bellows to thereby alternately suck and discharge the fluid, wherein the fitted assembly formed by at least partially fitting said pump cylinder, bellows and air cylinder portion with each other is tightly inserted in an external cover and constrained on the opposite ends thereof for come-off prevention.