Valve-type closure for containers
AssigneeAlumasc Limited
InventorRoger J. Hyde
Life of this patent
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Abstract
In order to reduce the risk of inadvertent removal from an internally-pressurized cask or keg of a valve-type closure through which the contents are discharged, the valve body (15, 16) has rotationally-mounted on it an axially-trapped sleeve (23) which is threaded into the usual fixed socket (11) on the cask or keg. As the sleeve is screwed in, a peg (24) on the body enters a channel (25) in the socket to guide the body axially into the socket. On attempted removal of the sleeve (23) without a special tool to restrain rotation of the body in the unscrewing direction, the body tends to rotate in the unscrewing direction and the peg (24) enters a blind-ended passage (27) so preventing removal of the closure. However, the body moves axially sufficiently to open a gas-relief passage from the cask or keg to atmosphere.
Claims8
A closure arrangement for a metal container comprising in combination a neck adapted to be rigidly secured to said container, a screw-threaded socket internally of said neck, and a valved closure to be screw-threaded into said socket;
- a construction of said valved closure comprising a tubular body, a closure valve housed within said body to control fluid flow therethrough, a sleeve rotatably mounted exteriorly on said body, means locating said sleeve against axial displacement of said sleeve on said body, said sleeve having an external screw-thread to engage said internal screw-thread of said socket, and a guiding connection between said tubular body and said neck to restrict rotation of said body in said neck and allowing axial travel of said body into said neck to a fully-inserted position on screwing-in of said sleeve, and said guiding connection including body-retaining means operative to limit axial travel of the body from the fully-inserted position on occurrence of rotation of the body in the neck in the unscrewing direction on unscrewing the sleeve;
- and pressure-gas relief means including a gas passage, and a seal operative to close the gas passage in said fully-inserted position of the body, said gas passage being opened around said seal on travel of the body axially from the fully-inserted position.
Dependencies are inferred from the claim text.