| 摘要 |
A screw-on closure cap for closing the filling opening of a container or a tubular spout, the cap comprising relatively rotatable upper and threaded lower cap parts assembled together coaxially and having a resilient drive connection between them capable of transmitting a predetermined maximum torque between the upper and lower cap parts in the closing direction. When during the screwing on of the cap onto the neck of a container or filling spout by the manual application of closing torque to the upper cap part, directly the closure cap reaches a certain degree of tightness on the cooperating part of the container or spout such that the predetermined transmitted closing torque is exceeded, the resilient drive connection yields ratchetwise to allow the continued free rotation of the upper cap part relatively to the threaded lower cap part. In this way excessive tightening of the closure, such as would lead to difficulty in loosening it manually, is prevented. The resilient drive connection may comprise a disc having oblique spring tongues engaging ratchetwise in cooperating recess for example in the interior of a hollow pressed-out hand grip portion on the upper cap part; or spring-loaded ball catches cooperating with recesses; or dog-like projections with oblique or rounded faces cooperating with recesses; or oblique spring tongues engaging behind rigid projections.
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