| 摘要 |
PROBLEM TO BE SOLVED: To provide a trigger dispenser not generating a problem such as the discharge failure caused by liquid dripping or drying solidification even in such a case that a liquid relatively high in viscosity and much in discharge quantity per one time is discharged. SOLUTION: In the trigger dispenser constituted so as to reciprocate a piston by the shaking operation of a trigger lever to discharge a content liquid by constant quantity, a suction valve is provided in a cylinder chamber and a discharge valve is provided to the leading end of a discharge pipeline and the quantity of the residual liquid remaining in front of the discharge valve is made as little as possible to prevent not only liquid dripping but also the drying solidification of the residual liquid and the liquid relatively high in viscosity and much in discharge quantity per one time can be discharged. A cut-off valve for cutting off the suction valve and the discharge pipeline in the state before the operation of the trigger lever is provided and a sucking return groove for sucking the residual liquid to return the same is formed to the valve seat of the discharge valve and the cut-off valve is closed before the completion of the suction process of the piston to suck the residual liquid to return the same in the remaining suction process and the residual liquid is still more reduced to certainly prevent liquid dripping.
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