Patent ID: 6105830
Filing Date: 2000-08-22
Classification: B05B

Abstract:
A pump mechanism which is to be attached to a container to be filled with a liquid and ejects the liquid from the container, said pump mechanism comprising:a cylinder having a liquid introduction port;a piston which is displaceable in said cylinder;an ejection guide path for the liquid, said path being communicated with a space in said cylinder, the liquid stored in said cylinder being ejected via said ejection guide path by a pushing force which causes said piston to be displaced from an original position to a displaced position; andrecovery means for restoring said piston from the displaced position to the original position by a gas pressure and storing the liquid in said cylinder when the pushing force is released, the gas pressure being generated by the pushing force;wherein the gas pressure is generated by making a space in said cylinder a substantially vacuum state, thereby generating a pressure difference between an internal pressure of the space and atmospheric pressure acting via the liquid on said piston.