| 摘要 |
PROBLEM TO BE SOLVED: To provide a pump which comprises an operation member attached to a cylinder B so as to be vertically movable with respect to the cylinder, in which the operation member E comprises a piston E3 attached to a stem E1 so as to be relatively vertically movable with respect to the stem, and which scoops up and discharges liquid in a vessel body 100 by the vertical movement of the operation member, and is improved in structure so as not to easily come off by constituting a particular structure in the fitting of a piston guide.SOLUTION: A lower end of a stem is formed of an inner cylinder part 40 having an opening 45 and an outer cylinder part 41, a piston E3 is constituted by connecting an internal slide part 60 whose upper end is slidably fit to an internal periphery of the outer cylinder part and an external slide part 61 which is slidably fit to an internal periphery of a cylinder B by a connecting part 62, an attachment base 50 having an attachment cylinder 50a attached to an external periphery of the inner cylinder is fit to a lower end of the inner cylinder via recess/protrusion engagement means, and a piston guide E2, in which a second check valve seat 51 reaching a lower part of the outer cylinder part from an external periphery of the attachment cylinder and forming a second check valve V2 together with the internal slide part is protrusively formed, is arranged. |
