| 摘要 |
A cam-advance, thread-retract dispensing stopper cap construction of unusually short axial dimension, comprising a body portion having annular walls with a discharge passage extending through it, and a captive screw cap movable axially on the body portion between sealing and dispensing positions. Both the screw cap and the body portion have cooperable screw threads which are operable in a screwing-down direction only. The body portion has a stopper plug which is carried in the discharge passage by means of multiple webs, and which is adapted to be received in a discharge orifice of the screw cap when the latter is disposed in the sealing or fully screwed-down position. An annular space is defined between the walls of the body portion and the stopper plug, and contains a curved cam track on which a depending cam follower lug of the screw cap can ride as the latter is unscrewed, thereby to positively force the cap open. The arrangement is such that in the fully unscrewed condition, the discharge orifice of the screw cap is raised above the stopper plug a sufficient amount to permit the contents of the container to be dispensed therethrough. Due to the unique arrangement of the cooperable threads and of the cam track and follower construction, an extremely compact closure is realizeable, with only a minimum amount of axial length being required. This is important in certain applications, as where it is necessary to limit the overall axial length of the container.
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