| 摘要 |
A combined closure and dispensing control top for closing containers and for controlling the rate of dispensing of the contents of the containers when inverted. The top has a housing defining a body member with fore and ejection chambers interconnected by a passageway. A closure member has a piston portion positioned for sliding movement within the ejection chamber for controlling the effective size of the passageway. The piston portion is movable between a blocking position closing the passageway and a dispensing control position which determines the effective size of the passageway. The ejection chamber has front and rear openings, with the front opening being closable by an intermediate portion projecting forwardly from the piston portion. Prior to initial dispensing from the container, the closure and dispensing control member has an enlarged portion positioned outside of the housing and connected to the intermediate portion. The enlarged portion has a size greater than the diameter of the front opening in the ejection chamber and provides a visual indication that the container has not been previously used. The closure and dispensing control member also has a portion extending rearwardly from the piston portion through the rear opening of the injection chamber. This portion terminates in an enlarged end that can be grasped by a user to move the piston portion. Initial movement of the piston portion rearwardly separates the enlarged front portion from the intermediate portion. The closure and dispensing control member includes an axially extending bore that admits air into the ejection chamber during dispensing.
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