Patent ID: 8622254

Claim:
A dispenser pump for allowing a user to dispense contents by a predetermined amount by pressing a push button ( 40 ), the dispenser pump comprising: a pump body ( 10 a ) mounted to an opening of a container; a cylinder ( 20 ) mounted to the pump body ( 10 a ); a second cylinder tube ( 24 ); a connecting/feeding pipe ( 28 ) disposed at least partially within the second cylinder tube ( 24 ); a working piston rod ( 26 ) disposed at least partially within the connecting/feed tube ( 28 ); and; a resilient member ( 30 ) mounted between the cylinder ( 20 ) and the working piston rod ( 26 ) wherein the contents do not contact the resilient member throughout the process of dispensing the resilient member ( 30 ) having an annular catching step extending radially outward from an peripheral portion of one end thereof, the annular catching step having a tip end to fit in an insert groove formed on an upper surface of the second cylinder tube ( 24 ), the resilient member ( 30 ) also having an annular coupling step extending radially inward from a peripheral portion at an opposite end thereof and having a tip end to fit in a stepped inner surface of the connecting/feeding pipe ( 28 ).