| 摘要 |
<P>PROBLEM TO BE SOLVED: To prevent the air leakage of a push pump which is used for a detergent container or the like. <P>SOLUTION: This push pump is constituted of a fixed pipe 10, a movable pipe 20, and a tightly sealing apparatus 30. On one end of the fixed pipe, a lid for the detergent container is arranged. In the fixed pipe, a space in which a content liquid flows, and a pump mechanism is arranged is formed. The tightly sealing apparatus is composed of a piston 31 and a reverse flow preventing valve 32, and a liquid sealing chamber 33 is formed in a space to the tip of the movable pipe. The tightly sealing apparatus performs a returning operation to an original position by a returning part 13 composed of a spring under the piston to a pump operation which is performed by depressing the head of the movable pipe. The content liquid in the fixed pipe is pressurized by the pump operation, pushes to open the valve, and is pumped out through the inside of the movable pipe by going through the liquid sealing chamber. When the pump is stopped, the valve closes and seals the liquid sealing chamber, and the content liquid is stored inside. Therefore, the tight sealing of the piston is kept even if there is a wear flaw on the internal wall of the fixed pipe. <P>COPYRIGHT: (C)2008,JPO&INPIT |
