| 摘要 |
The pump includes components designed for fabrication by high speed injection molding from plastic material, and is adapted for mounting by a suitable closure to a container. The basic components are a base, a head and an actuator. The base provides a sealed closure with the mouth of the container and provides a support barrel for the head. The support barrel also includes structure providing an inlet check valve seat, and for supporting the dip tube. The head includes a body having a dependent support stem for latching engagement with the support barrel, and a laterally projecting hollow plunger for supporting the actuator. The actuator is essentially a hollow barrel received over the plunger to define a variable pumping chamber, having a discharge orifice at its distal end, and having a trigger handle for manipulation and pumping action by the user. A compression spring within the pumping chamber assists in the pumping action. These basic components include coacting structure for latching the plunger in a locked condition where the container can be shipped with the pump assembly attached and leakage is prevented, and wherein the latching structure is designed to inhibit release of the plunger to the pumping position by children. As an accompanying structure, the pump base and container may have coacting structural features for latching the pump assembly to the container in a manner to inhibit removal of the pump assembly from the container by children.
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