CHILD-RESISTANT CLOSURES FOR CONTAINERS, AND CONTAINERS FOR CLOSURE THEREBY

摘要

A double-shell child-resistant screw closure and a container neck to be fitted with the closure have complementary multi-start threads with quick-rise characteristics. When the closure has been applied projections (60) formed on the container are received in recesses (63) in the closure threads. The additional frictional resistance created by the projections as they ride out of the recesses and move along the closure threads ensures that the child-resistant capability of the closure is not lost because of inadequate resistance between the inner shell and the container.