| 摘要 |
A pump for bottles, cans, containers, and the like, which dispenses a fluid mist or spray. The pump has a spray head with a series of cavities forming passageways leading from a tube, which extends down into the bottle, can or other container to a jet-orifice at a spray-dispensing nozzle. Between two of the cavities is a trigger-bulb which expands, after compression, under the force of a plastic memory to suck fluid from the can or bottle. When the trigger-bulb is again squeezed, or otherwise actuated, the fluid is forced out the jet-orifice at the nozzle. The upper edge walls of the trigger-bulb provide the valving action which opens or closes the passageways to control the direction of fluid flow. The breathing air which replaces dispensed fluid in the container, or the like, is controlled by a valve action under the flange. To control the amount of fluid which is dispensed on each pump action, the internal volume of the trigger-bulb may be changed by a molding insert or sleeve in order to reduce its volume. A back-stop anvil limits the rearward travel of the trigger-bulb. In some embodiments, this anvil has a contour which establishes the deformation of the bulb, when it is squeezed.
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