| 摘要 |
A two-piece, plastic, screw-on, closure and dispenser has an outer tubular female part with upper and lower internal screw threads and a separate, inner tubular male part with a single external screw thread rotatably attachable to the upper thread of the female part the lower thread of which is screwed onto the external screw thread of an outlet on top of a container, the male part is double-walled, an elongated pouring spout is an integral axial extension of an inner wall and a knurled hand knob is at the top of an outer wall and is turnable in either direction within the stationary female part for axial extension or retraction of the spout. An integral, internal, annular frustro-conical flange extends around the internal wall surface of the female part between threads and forms a valve seat around a fluid-flow opening. A disc-like valve member with a frustro-conical, peripheral, valve-sealing surface is spaced by webs below the male part creating in conjunction with the valve seat, a baffled port for interrupting two way flow of air entering and liquid exiting a container via the device to smooth out liquid dispensing by reducing the size and increasing the rapidity of " glugging". Combination movement stops and sealing surfaces on external ledges are provided between male and female parts.
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