KR20110031167A - Metallic lid for a can - Google Patents

Abstract

The lid 20 includes a bottom wall 21 that employs sidewalls 22 that are seated in the sheet S formed by the openings 14 of the can 10 and held axially. The bottom wall 21 includes a peripheral annular portion 23, a central portion 24, and a rib portion 25 having an inverted U-shaped approximation and connecting the peripheral annular portion 23 and the central portion 24. The central portion 24 includes an annular panel 24a and a central panel 24b connected to each other by an axial step 24c, and the outer circumferential edge of the annular panel 24a is incorporated into the annular rib portion 25. The axial step portion 24c is made of a material that is plastically deformed from the adjacent annular panel portion 24a and the center panel portion 24b.

Description

Metal lid for cans {METALLIC LID FOR A CAN}

Field of invention

The present invention represents a peripheral sidewall with a free upper edge designed to be axially seated in the seat formed in the upper opening of the can and retained in an axial direction, the central region of which generally receives an auxiliary lid of transparent plastic material. Reference is made to the metal lid of the type optionally provided with an inspection opening.

Conventional technology

Metal lids of the type described above are well known. They are formed from a single piece of metal sheet and generally include a disk-shaped bottom wall, the peripheral edge of which is removably fitted into the sheet formed in the upper opening of the can in combination with an upwardly protruding side wall. It can be maintained in the axial direction. The sheet may be formed by a tubular protrusion incorporated into the top of the central opening of the upper wall of the can having a circular or polygonal cross section.

The metal lid of the above-described type is US Patent No. 2,074,231, US Patent No. 3,347,308, UK Patent No. 8002622-2, UK Patent No. 8002618-4 and UK Patent No. The two patents at the end are those of the same applicant as the present patent application. In these prior art structures, the lid structure comprises only a bottom wall and a peripheral side wall, and maintaining the lid axially in a sheet formed in the upper opening of the can is typically at least one of the sheet and lid side wall portions in the upper opening. Through engagement means provided in the part so as to be able to interact with another of the parts. In a structure of the type described above, the lid structure is closed even if the bottom wall of the lid exhibits a drawn or raised center as taught in the solutions disclosed in British Patents 7601221-2 and 3,347,4-8. Care must be taken when applying the force, which closes the cover unavoidably, preventing the airtight and secure sealing of the can. The aforementioned structural defects are due to the fact that the lid structure is incorporated into the annular upper wall of the can body as in the decades known structure disclosed and shown in US Patent 795,126, filed in 1904. This is because it does not exhibit the usual peripheral strength that is ensured in a metallic lid with a perimeter annular recess having a cross-section that is frictionally seated inside the recess having a corresponding cross section forming a sheet and having a substantially inverted ladder shape.

Structures disclosed and claimed in Brazilian Patent Application No. PI0405458-0 of the same applicant in view of increasing the structural strength of known lids, which represent only peripheral sidewalls and bottom walls that are seated in the upper opening of the can and maintained in the axial direction. An alternative solution has been proposed, in which the bottom wall of the lid comprises a central and peripheral annulus interconnected by annular ribs approximating the inverted U shape. This conventional structure provides a lid that is formed to a desired metal sheet thickness without increasing the metal sheet thickness, increases in structural strength, and overcomes the deficiencies of known lids. Providing annular ribs to the bottom wall, as disclosed in Brazilian Patent No. 0405458-0, results in a higher structural strength of the lid. However, even if the annular ribs are incorporated into the bottom wall of the lid, the metal sheet must still have a constant minimum thickness for the structural strength required for proper and reliable operation of the lid.

Summary of the Invention

In accordance with the foregoing with respect to the prior art, the present invention is capable of opening and closing the lid in a conventional manner or without the risk of causing plastic deformation that can render the lid useless without reducing the structural strength to a value lower than desired. It is an object of the present invention to provide a metal lid of the above-described type in which an annular rib portion is provided in the bottom wall and the strength is increased to the extent that the lid can be constructed of a metal sheet having a reduced thickness.

The above and other objects of the present invention exhibit a cross-section having a peripheral annular portion, a central portion, and an inverted U approximation shape adjacent to the side wall of the lid, with the side legs downwardly at adjacent edges of the peripheral annular portion and the central portion of the bottom wall, respectively. It is achieved by providing a metal lid of the type having a bottom wall comprising coalesced annular ribs.

According to the invention, the central portion of the bottom wall comprises an annular panel and a central panel connected by an axial step, wherein the outer circumferential edge of the annular panel is incorporated into an adjacent side leg of the annular rib portion, and the axial step portion is an adjacent annular panel portion. And a material that is plastically deformed from the center panel portion.

By the structure generally defined above, in addition to the fact that the central part and the peripheral annular part of the bottom wall of the can are connected to each other by the annular rib part, the central part employs an axial step part in the radial center area, which is the bottom part. It is incorporated into the wall to form one or more structural elements spaced apart from the sidewalls of the lid.

In addition to providing an annular rib, the provision of an auxiliary axial step provides a lid with considerably greater structural strength than that obtained in the prior art structure described above, which has a suitable structural strength and a smaller thickness, ie material consumption. A lid formed of fewer metal sheets can be obtained.

Further, the structure of the lid object of the present invention can be made such that the central panel of the central portion of the bottom wall exhibits an inspection opening that forms a sheet for seating the auxiliary lid of the transparent plastic material in the axial direction.

The invention will now be described with reference to the accompanying drawings, which are given as examples of possible constructions for the lid, wherein:
1 shows a partial schematic cross-sectional view of an upper region of a can in which a lid fitted in one of the known prior art solutions is fitted in the discharge end opening;
FIG. 2 shows a plan view of a lid of the type shown in FIG. 1 but employing an axial step according to the first embodiment of the invention; FIG.
3 shows a partial schematic cross-sectional view of the lid mounted on the discharge end opening of the can according to line III-III of FIG. 2;
4 shows a plan view of a lid of the type shown in FIG. 2 but employing a radial extension of a central panel according to a second embodiment of the invention;
5 and 6 show partial schematic cross-sectional views taken along the lines VV and VI-VI of FIG. 4, with the lid mounted to the discharge end opening of the can;
7 shows a plan view of a third embodiment of a lid of the present invention;
8 is a partial schematic cross-sectional view taken along the line VIII-VIII of FIG. 7 with a lid mounted to the discharge end opening of the can.

Detailed description of the invention

As shown in the accompanying drawings, the lid of the present invention is applied to a can 10 which schematically shows only the upper part of the side wall 11, on the upper edge of the can which is typically an annular upper wall by a double seam 12. An outer circumferential edge of (13) is attached, and an opening 14 is provided at the center of the lid, and a suspension tubular protrusion 15 is formed at the edge of which forms a seat ("S") for seating the lid of the can. have.

In the structure of the prior art illustrated in FIG. 1 of the drawings for the purposes of Applicant's Brazilian Patent No. 9408643-5, the suspended tubular protrusion 15 has a continuous circular shape as described in the prior patent. In order to form the tubular rib 16 there is provided a lower end bent inwardly and upwardly of the opening 14 and with respect to the suspended tubular protrusion 15.

However, the structure of the suspended tubular protrusion 15 of the annular upper wall 13 of the can 1 may have other structural arrangements as exemplified and discussed in the above-mentioned prior patent document, the modification of which It should be understood that it does not alter the structural and functional purpose of the invention.

As already mentioned, the lid 20 of the present invention is typically formed from a single piece of metal sheet comprising a bottom wall 21 in the form of a flat disc, incorporating side walls 22 around the top and around the side walls 22. Has a free upper edge 22a and is frictionally seated inside the seat " S " formed by the suspended tubular protrusion 15 of the opening 14 provided in the annular upper wall 13, Designed to be maintained.

In the exemplary structure shown in the figure, the lid 20 has a side wall 22 with a continuous peripheral recess 22b, inside the continuous tubular rib of the suspended tubular protrusion 15. 16 is fitted in a sealed manner and held in the axial direction.

In the illustrated structure, both the continuous tubular rib 16 of the suspended tubular protrusion 15 and the continuous peripheral recess 22b of the side wall 22 of the lid 20 are at least partially circular and correspond to each other. Since the shapes are mutually seated, the components improve not only the axial holding force of the lid 20 in the opening 14 of the can 10 but also the sealing effect in this friction seating region. However, it is understood that continuous tubular ribs 16 and continuous peripheral recesses 22b may exhibit shapes other than the circular tubular shapes illustrated in the figures, as can be seen in the prior art literature cited at the outset of this description. shall.

 Also in accordance with the embodiment shown in the figure, the lid 20 extends outwardly to form a tubular upper rib 22c in the area surrounding the opening 14 to be seated in the annular upper wall 13 of the can 10. And a free upper edge 22a that is bent downward and toward the side wall 22. Thus, the free upper edge 22a of the side wall 22 of the lid 20 may exhibit another structural form as exemplified in the prior art document cited above, and the upper side of the side wall 22 of the lid 20. It should be understood that such other modifications to the arrangement and shape of the area do not alter the functional features of the present invention proposed herein.

According to the present invention, the bottom wall 21 of the lid 20 has a cross section in the form of a peripheral annular portion 23, a center portion 24, and an inverted U approximation adjacent to the side wall 22, and the side legs have a bottom wall ( 21 and annular ribs 25 incorporated downwardly at adjacent edges of the peripheral annular portion 23 and the central portion 24. The annular rib 25 is preferably stamped with the remainder of the lid 20 to project upwardly from the peripheral annular portion 23 and the central portion 24 of the bottom wall 21, and of the can 1. The annular rib portion 25 is provided at an appropriate distance from the side wall 22 to provide the edge region of the lid 20 with the structural strength necessary to resist the compressive force exerted on the lid 20 when the lid is fitted in the opening 14. Are spaced apart.

According to a preferred embodiment, the central portion 24 of the bottom wall 21 is disposed on a surface higher than the surface including the peripheral annular portion 23 of the bottom wall 21. By this structural arrangement, when loading the lids into the automatic can closure, the central portion 24 of the bottom wall 21 acts together with the annular rib portion 25 to form a seating means for placing the lid up and down, or Alternatively, the lid 20 can be automatically fitted to each annular top wall 13 before being double seamed on the side wall 11 of the can 1.

The annular ribs 25 are also constructed and dimensioned in such a way that they are arranged below the surface Ps comprising the free upper edge 22a of the side wall 22 of the lid 20, the relative dimensions of these parts being In accordance with the loading characteristics discussed above and discussed in Brazilian Patent 0405458-0.

According to the present invention, the central portion 24 of the bottom wall 21 is the outer circumferential edge incorporated in the adjacent side leg of the annular rib portion 25 and the center disposed on the surface slightly above the annular panel 24a in a general planar form. A general planar annular panel 24a having an inner circumferential edge united by an axial step 24c to an outer circumferential edge of the panel 24b is included. In order to be able to form the lid 20 representing the axial step 24c into a blank metal sheet with annular ribs 25 having the same dimensions as needed to produce the lid defined in FIG. The directional step portion 24c is made of a material that is plastically deformed from the adjacent annular panel portion 24a and the center panel portion 24b.

Providing the axial step 24c is sufficient to ensure that the structural strength of the lid can be reduced in the normal thickness of the metal sheet of the lid without accurate or reliable opening and closing of the can by the lid or reaching a detrimental value. The structural strength of the lid 20, in particular the bottom wall 21, is improved.

In the embodiment illustrated in FIGS. 2 and 3, the center panel 24b is completely closed and has no openings and has a radius R that is about twice the radial width RL of the annular panel 24a. Have

The height of the axial step 24c should only be such that it yields the desired effect of increasing the structural strength of the lid 20 having a value approximately equal to the thickness of the metal sheet used to form the lid 20. The material used to form is limited only to the material which is deformed from the adjacent annular panel portion 24a and the center panel portion 24b during the stamping operation of the lid.

In the second embodiment illustrated in FIGS. 4, 5, and 6, the central panel portion 24b of the lid 20 employs a plurality of radial extensions 24d, which extensions comprise the central panel portion. It is coplanar with (24b) and extends to the adjacent side leg of the annular rib part 25 in which they were merged. In the illustrated embodiment, the radial extensions 24d are four in number, but may vary more or less than this number. However, the radial extensions 24d are preferably equally spaced apart from each other at an angle. It is also possible to stamp the lid 20 such that the radial extension 24d of the center panel 24b is disposed on a surface slightly off the surface of the center panel 24b in the axial direction.

In the embodiment illustrated in FIGS. 7 and 8, the central panel 24b is radially spaced from the axial step 24c to seat the peripheral sidewall 31 of the auxiliary lid 30 of transparent plastic material. An inspection opening 26 is provided which forms a sheet to hold in the axial direction, and the inspection opening 26 is provided with an inner circumferential rib to be fitted into a corresponding circumferential recess 33 provided in the peripheral side wall 31 of the auxiliary lid 30. And a suspended skirt portion 27 formed to incorporate 28. The structure of the inspection opening 26 and the auxiliary lid 30 can follow the same procedure applied to the lid 20, keeping the dimensions of the incidental parts proportionately proportional to the minimum diameter of the auxiliary lid 30. It should be understood that the radial extension 24d of the center panel 24b is also annular in this case and may also be provided in the embodiment illustrated in FIGS. 7 and 8.

In the embodiment illustrated in the drawings, the central portion 24 and the peripheral annular portion 23 of the bottom wall 21 of the lid 20 are flat.

Although only some structural forms of the lid are illustrated here with the sheet structure, it is to be understood that modifications of the form of the component parts may be made without departing from the structural concepts defined in the claims appended hereto.

Claims (10)

A metal lid to be applied to a can 10 having an opening 14 forming a sheet S, the lid 20 having a free upper edge 22a and seated in a friction manner within the sheet S. An axially retaining sidewall 22 is employed around the top, and the bottom wall 21 has a cross section having a peripheral annular portion 23, a central portion 24, and an inverted U approximation shape adjacent to the sidewall 22. The side legs are merged downward to the peripheral annular portion 23 and the adjacent edges of the central portion 24 of the bottom wall 21, and the lid 20 has a central portion 24 with an axial step portion 24c. And an annular panel 24a and a center panel 24b connected by the outer peripheral edge of the annular panel 24a, which are incorporated into adjacent side legs of the annular rib portion 25, wherein the axial step 24c A metal cap comprising a material that is plastically deformed from the adjacent annular panel portion 24a and the center panel portion 24b. The metallic lid of claim 1, wherein the radial width (RL) of the annular panel (24a) corresponds to about half of the radius (R) of the center panel (24b). 3. Metallic lid according to claim 1 or 2, characterized in that the axial step (24c) exhibits a thickness approximately equal to the thickness of the metal sheet used to form the lid. The metal lid according to any one of claims 1 to 3, wherein the annular rib portion (25) protrudes upward from the peripheral annular portion (23) and the center portion (24) of the bottom wall (21). 5. The metallic cap according to claim 4, wherein the central portion (24) of the bottom wall (21) is disposed on a surface higher than the surface comprising the peripheral annular portion (23) of the bottom wall (21). 5. The metallic lid according to claim 4, wherein the annular rib portion (25) is disposed below the surface (Ps) including the free upper edge (22a) of the side wall (22) of the lid (20). The metal lid according to any one of claims 1 to 6, wherein the annular panel 24a and the center panel 24b are flat, and the center panel is disposed on a surface slightly higher than the annular panel 24a. . 8. The central panel 24b is spaced apart from the axial step 24c, and the peripheral side wall 31 of the auxiliary lid 30 of transparent plastic material is seated in the center panel 24b. An inspection opening 26 is formed to form a sheet to hold in the axial direction, and the inspection opening 26 is provided with an inner circumferential rib to be fitted into a corresponding circumferential recess 33 provided in the peripheral side wall 31 of the auxiliary lid 30. A metal lid comprising a suspended skirt portion 27 formed to coalesce with 28. 9. The central panel 24b of the central portion 24 of the lid 20 employs a plurality of radial extensions 24d, the plurality of radial extensions being angled to each other. A metal lid, which is spaced apart from each other and extends to adjacent side legs of the annular rib portion 25 in which these extensions are incorporated. 10. The metallic lid according to claim 9, wherein the radial extension (24d) is coplanar with the center panel (24b).

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