| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a push-down head of a pump which can prevents clogging due to solidification of liquid in a nozzle tube, prevent dryness of the nozzle tube in most cases without special operation, jet the liquid as it is, switch to the dryness-preventing state automatically after jetting the liquid, and can be easily handled. <P>SOLUTION: The nozzle tube A<SB>3</SB>is formed of a very flexible and elastic material. A bulky seal material A<SB>4</SB>engages with the tip end of the inside of the nozzle tube to shield the inside from the outside. A pull out-preventing mechanism is mounted to prevent the seal material from being pulled out of the nozzle tube, and the liquid is jetted through a clearance d between the seal material and the nozzle tube by expanding the nozzle tube with liquid pressure during jetting. <P>COPYRIGHT: (C)2010,JPO&INPIT |
