| 摘要 |
PROBLEM TO BE SOLVED: To prevent the inside of a cylinder lower section from being highly pressurized when an operation body is clamped to the lower limit in a vertical pump type liquid jetting instrument in which the operation member to stand up by being upwardly energized from inside the cylinder is pressed down in against the energizing force and engaged at the pressing-down position and the lower end of a liquid jet pipe of the operation member is closed at the pressing-down position by a closed-end sealing cylinder at the upper end of a sealing member standing up from inside the cylinder low section. SOLUTION: A closed-end sealing pipe 24 section being in contact with a lower section inner wall face of a jet pipe 12 in the water-tight state is formed in the upper section of a sealing cylinder, and an elastically deformable thin-wall section or sections 36 are formed vertically on one or a plurality of sections on the upper section of the sealing cylinder, and a check valve 37 for releasing the liquid in the cylinder lower section into the jet pipe 12 is formed by the thin-wall sections 36 and the lower section inner wall face of the jet pipe 12 with which the outer faces of the thin wall sections 36 are brought into contact. |
