| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a novel foam jetting unit having high sealing property sufficient to surely prevent the inner leakage over a long period of time. <P>SOLUTION: The foam jetting unit is provided with a pump 2 having two feed passages for separately sucking, pressurizing and force-feeding the content in a vessel and air and a nozzle head 8 connected to the pump 2 through a through hole (h) and for mixing the content and the air force-fed respectively through two feed passages by the action of the pump 2 and making the mixture foam-like and jetting it toward the outside. The pump 2 is provided with a large diameter cylinder part 2a forming a suction, storage and pressurizing space for air and a small diameter cylinder part 2b integrally connecting to the bottom wall of the large diameter cylinder part 2a and forming a suction, storage and pressurizing space for the content. In an air piston 3 arranged in the large diameter cylinder part 2a, one of a cylindrical guide 9 holding the air piston 3 and a circular seat part 10 in contact with the cylindrical guide 9a is provided with a thin walled part 11 for blocking a feed passage 13 for the air by keeping a contact part of the circular seat part 10 with the cylindrical guide 9 to high air tightness by being made flexibly deformable by the contact. <P>COPYRIGHT: (C)2008,JPO&INPIT |
