Patent ID: 6938803

Claim:
A liquid jetting pump comprising: a mounting cap fitted to a container neck portion; a cylinder fixed to a container through the cap and including a suction valve provided in a lower edge part extending downward into the container; a stem having an annular piston fitted to an interior of the cylinder and protruding from a lower part of an outer periphery, and so provided as to be vertically movable in an upward-biased state; a push-down head, with a nozzle, disposed in continuation from an upper edge of the stem and so provided as to be vertically movable above the mounting cap; and a discharge valve provided with a valve member for closing a valve hole by placing it on a valve seat provided on an inner upper part of the stem, a liquid within the container being sucked into the cylinder through a suction valve, and a liquid within the cylinder being jetted out of the nozzle through the discharge valve from the stem by vertically moving a vertically movable member constructed of the stem and the push-down head, wherein a bar-like member with its upper edge part protruding into the stem is provided, a tip of the bar-like member is in a lower position of the valve seat of the discharge valve in the maximum ascent position of the vertically movable member, the tip of the bar-like member protrudes with a gap along the periphery upwardly of the valve seat by pushing down the vertically movable member, and the liquid existing downstream of the discharge valve flows back upstream of the discharge valve via the gap when the vertically movable member is raised, and wherein an inner lower edge of the stem includes an annular protruded portion having an inner peripheral surface that is slidably fitted to the outer periphery of the bar-like member to allow stable vertical movement of the vertically movable member and the interior of the cylinder communicates with an interior of the stem while the annular protruded portion is slidably fitted to the bar-like member.