LIQUID INJECTION PUMP

摘要

PROBLEM TO BE SOLVED: To provide a liquid injection pump having a simple structure in which a stem 5 is projected out of the upper end of an installed cap 4 fitted to a port neck segment 3 of a container in such a way that it can be moved up and down under its upward urging state, an injection head 7 having a nozzle 6 at the upper end of the stem is fitted to and fixed to it and sound can be generated automatically at the time of liquid injecting operation. SOLUTION: An annular cylinder A is arranged on an installed cap and there is provided an annular piston B having its upper segment fixed to an injection head 7 in such a way that it can be integrally moved. A top plate of the piston is provided with a whistle C of which one end is opened and communicated with an external side and the other end is opened into the annular piston B, there is provided a whistle C for generating sound through passing of air when the injection head is moved up and down.