| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a discharge pump capable of preventing the leakage of the content by securing the sealing property of a contact place between a stem and a piston. <P>SOLUTION: The discharge pump 1 is provided with a cylinder 4 arranged in a container 2 housing the content, the stem 5 erecting to be pushed from the top end of the cylinder 4 under upward energized state and a cylindrical piston 6 arranged inside the cylinder 4 and being in liquid-tightly contact with the inner peripheral surface of the cylinder 4 and the inner peripheral surface of the stem 5, wherein the stem 5 is pushed into the cylinder 4, consequently the piston 6 is pushed by the stem 5 and slides downward in the cylinder 4 and the content supplied from the container 2 into the cylinder 4 is discharged through the stem 5. In the pump, the sliding resistance of the stem 4 to the piston 6 is set to be smaller than the sliding resistance of the cylinder 4 to the piston 6 and the stem 5 is formed from a material having a non-swelling property to the content. <P>COPYRIGHT: (C)2009,JPO&INPIT |
