| 摘要 |
A trigger type liquid dispenser having a nozzle unit including a nozzle at its front end, a pump operated by a trigger and a container mount, in which the pump is operated by the trigger and has an annular cylinder including concentric outer and inner cylindrical members of double wall shape projecting forwardly of a body, and a piston unit telescoped in the annular cylinder and having an annular piston sliding on the inner surface of the outer cylindrical member and the outer surface of the inner cylindrical member. The piston unit has skirts annularly flared at the axial edges of the sliding surfaces which coact with the surface of the inner and outer cylindrical members to form a pump chamber. A spring is contained in a spring chamber formed of a bore in the inner cylindrical member of the annular cylinder with the piston unit telescoped about the inner cylindrical member, the spring urging the piston unit outwardly of the annular cylinder. The spring chamber capable of communicating with the atmosphere, and an intake valve is provided for communicating atmospheric air with the neck of the container whenever the piston unit is operated by the trigger. Thus, the trigger type liquid dispenser can protect a spring, complete a pumping action and smoothly execute the intaking operation of a liquid container.
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