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US 4,135,306 AGranted
Closure testing means and method
OwnerCharles N. Hannoninventor
Life of this patent
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OwnerCharles N. Hannoninventor
Estimating the term…
The depth of thread in a roll-on closure is tested by determining the radial distance between the peak and valley defining a profile of the external surface of the threaded section. Apparatus for measuring the peak includes a first sensor broad enough to span the valley. Apparatus for measuring the valley includes a sensor able to fit into the valley. The container with the closure thereon is rotated to permit the latter sensor to enter to the full depth of the thread valley in case the point at which that sensor first encounters the surface of the closure is in a shallow end of the valley or not in the valley at all. If the second sensor moves far enough relative to the first sensor and in a radial direction with respect to the closure, the apparatus will respond to such relative movement as indicating that the closure has a predetermined thread depth. If the second sensor does not move far enough relative to the first sensor within a prescribed length of time or amount of rotation of a container, after the initiation of measurement of the closure on that container, the apparatus indicates that the thread depth of that closure is less than the predetermined value.
Apparatus for testing closures on containers, said closures comprising a thin-walled cylindrical portion deformed over a predetermined axial region by external pressure to form a threaded section comprising an outer surface with outwardly extending parts and a valley therebetween in conformity with a threaded part of the neck of the container, said apparatus comprising:
The method of testing the thread depth of the external surface of closures on containers, said method comprising the steps of:
Dependencies are inferred from the claim text.