Tube head equipped with a lid, associated with an improved perforating cap which ensures protection of the lid prior to first use thereof
A tube head assembly includes a tube head that includes a solid insert forming a lid closing the neck, a cap that includes a punch, and a removable spacing ring disposed against the shoulder around the neck. The ring and the cap are formed integrally in one piece and are joined by material bridges and configured in such a way as to allow sliding of the cap through the ring after breakage of the material bridges, characterised in that the ring includes internal stops adapted to limit the movement of the cap through the ring in such a way as to keep the punch spaced from the lid when the cap is screwed onto the neck and butts against the ring.
1. A tube head assembly comprising:
a tube head comprising a neck defining a longitudinal axis, a shoulder and a solid insert forming a lid closing the neck,
a cap comprising a punch adapted to cut the lid, said cap being adapted to be screwed onto said neck, and configured in such a way that when said cap is screwed onto the neck the punch is inserted into an interior of the neck,
a removable spacing ring bearing against the shoulder around the neck,
the removable spacing ring and the cap being formed integrally in one piece and joined by material bridges, the removable spacing ring having an internal diameter greater than an external diameter of said cap, so as to enable the cap to slide through the removable spacing ring after breakage of said material bridges, characterized in that the removable spacing ring comprises internal stops adapted to limit movement of said cap through the removable spacing ring in such a way as to keep the punch spaced from the lid when the cap is screwed onto the neck and butted against the removable spacing ring.
2. The assembly according to claim 1 , wherein said punch is adapted to achieve partial cutting of said lid in order to open said neck when said cap is screwed in abutment against the shoulder after withdrawal of the spacing removable spacing ring from the tube head assembly, the lid remaining attached to an uncut part of the insert.
3. The assembly according to claim 1 , wherein the removable spacing ring comprises a plurality of ribs adapted to center the removable spacing ring around the neck.
4. The assembly according to claim 1 , wherein the removable spacing ring has a shape of a portion of a circle of which a free end forms a tab which can be gripped by a user.
5. The assembly according to claim 1 , wherein said punch has a free end bevelled along a plane inclined with respect to the longitudinal axis (Z-Z) of the neck when the cap is screwed onto said neck.
6. The assembly according to claim 5 , wherein said bevelled free end has a semi-circular cross-section.