Screw threaded plastic plug
AssigneeKoninklijke Emballage Industrie Van Leer B.V.
InventorMatheus Johannes Martinus Coppens
Life of this patent
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Abstract
A plug of plastic or other soft material to be screwed into a metal neck, with means for preventing the possibility of screwing in the plug obliquely. The means comprises a cone-shaped bevel around the first thread of the plug, the top angle of the bevelling cone corresponding to the top angle of the reamer used to ream the entry of the neck screw thread.
Claims8
Plug of plastic or another rather soft material provided with external screw thread and adapted to be screwed in a metal neck provided with internal screw thread, especially in a closure of a vessel, characterized in that the first thread of the screw thread on the plug is bevelled over 360.degree. by cone-shaping the lower edge of the plug, the top angle of the bevelling cone corresponding to the top angle of the reamer, with which the entry of the screw thread in the neck has been reamed.
Dependencies are inferred from the claim text.