Lid with sealing foil comprising retaining means

Abstract

The invention relates to a lid (1) for a can for foodstuff, paint and so on, which lid comprises: ringlike bare part (2) defining a opening (3); a sealing foil (4) arranged an the base part and covering the opening; a lip (5) arranged with one end to the foil for tearing the foil; retaining means for retaining a free end of the lip adjacent the sealing foil, whereby the retaining means comprise a first retaining part being part (7) of the sealing foil and a second retaining part being (8) part or the lip.

Claims

1. A sealing lid for a can comprising: a base part substantially shaped like a ring defining an opening; a sealing foil arranged on the base part and covering the opening; a peripheral lip unitary with the sealing foil and having a thickness that is equal to a thickness of the sealing foil, the peripheral lip coupled to the sealing foil to facilitate removing the foil from the base part arranged with a free end thereof folded back onto an upper surface of the sealing foil; and a releasable retaining means for releasably retaining the free end of the lip to the sealing foil, the releasable retaining means consisting of a first retaining part formed of the sealing foil integrally disposed on the upper surface of the sealing foil and a second retaining part formed of the sealing foil disposed on an underside of the peripheral lip, wherein the first retaining part and the second retaining part have a shape defined connection comprising projections which releasably engage with each other wherein the projections have a substantially T-shaped cross-section, and wherein lifting of the free end of the peripheral lip releases the first retaining means from the second retaining means while the sealing foil covers and closes the opening and subsequent action on the lifted free end of the peripheral lip opens the can by removing the sealing foil along with the unitary peripheral lip from the base part.

2. The sealing lid according to claim 1, wherein the lip and the sealing foil are integral.

3. The sealing lid according to claim 1, wherein the sealing foil is selected from among aluminum foil, steel foil and combinations of aluminum foil and steel foil.

4. A sealing lid for a can comprising: a base part substantially shaped like a ring defining an opening; a sealing foil arranged on the base part and covering the opening; a peripheral lip unitary and integral with the sealing foil and having a thickness that is equal to a thickness of the sealing foil, the peripheral lip coupled to the sealing foil to facilitate removing the foil from the base part arranged with a free end thereof folded back onto an upper surface of the sealing foil; and a releasable retaining means for releasably retaining the free end of the lip to the sealing foil, the releasable retaining means consisting of a first retaining part formed of the sealing foil integrally disposed on the upper surface of the sealing foil and a second retaining part formed of the sealing foil disposed on an underside of the peripheral lip, wherein the first retaining part and the second retaining part have a shape defined connection comprising projections which releasably engage with each other wherein the projections have a substantially T-shaped cross-section, and wherein lifting of the free end of the peripheral lip releases the first retaining means from the second retaining means while the sealing foil covers and closes the opening and subsequent action on the lifted free end of the peripheral lip opens the can by removing the sealing foil along with the unitary peripheral lip from the base part, and wherein the sealing foil is selected from among aluminum foil, steel foil and combinations of aluminum foil and steel foil.

Description

(1) These and other features of the invention will be elucidated in conjunction with the accompanying drawings.

(2) FIG. 1 shows an upper view of a lid according to the invention.

(3) FIG. 2 shows a bottom view of the lid according to FIG. 1.

(4) FIG. 3 shows a sectional view of the lid according to FIG. 1 taken along the line III-III.

(5) FIGS. 4A and 4B show two steps of a method according to the invention.

(6) FIGS. 5A and 5B show a cross-sectional view of the deformation accomplished with the steps according to FIG. 4A and FIG. 4B.

(7) In FIGS. 1 and 2 a lid 1 according to the invention is shown. This lid comprises a ring-like base part 2 which defines an opening 3. A sealing foil 4 is arranged onto the ring-like base part 2 covering the opening 3. The sealing foil 4 is sealingly arranged to the base part 2.

(8) Integral with the sealing foil 4 a lip 5 is provided. This lip 5 is attached to the sealing foil 4 through a retaining means 6, which resembles a rivet.

(9) In FIG. 3 a cross-sectional view of the lid according to FIG. 1 is shown. Clearly can be seen that the ring-like base part 2 defines an opening 3 onto which the sealing foil 4 is arranged. The lip 5 is integral with the sealing foil 4 and folded back onto the sealing foil 4. The lip 5 and the sealing foil 4 are connected by retaining means 6, which consists of a first T-shaped protrusion 7 which is arranged in a second T-shaped protrusion 8. Due to the T-shape the retaining action is accomplished.

(10) In FIG. 4A a tool 10 is shown with which a connection of a lip with a sealing foil can be achieved. The tool 10 has a lower die 11 and an upper die 12. On the upper die 12 a pressing member 13 is slidedly arranged and put under pressure by a spring 14.

(11) The sealing foil 4 and the lip 5 are brought onto the lower die 11. The upper die 12 together with the pressing member 13 is brought down onto the sealing foil 4 and the lip 5. The pressing member 13 will contact the lip 5 first through which a protrusion is pressed into the material of the foil and the lip (see FIG. 5A). After this protrusion is formed into both the sealing foil 4 and the lip 5, the upper die 12 is brought down further with force, such that the bottoms 15, 16 of the protrusions are butted. This causes the material of the bottoms 15, 16 to flow, such that the thickness of the bottoms 15, 16 reduces, but that the area A increases. This provides a T-shaped protrusion which connects both the sealing foil 4 and the lip 5.

(12) The lip can only be disconnected from the sealing foil 4 by deforming the material of the lip 5. As this deformation is visible, this lid according to the invention provides also a tamper proof.