KR20100075866A - Composite lid for container - Google Patents

Abstract

A composite lid for containers which comprise a tubular body (10) carrying an annular upper wall (20) made of sheet metal, in which is defined an opening (A) surrounded by a seat (21), which is configured to receive and retain a lid (30), which comprises a base portion (31) peripherally incorporating a retention portion (32) to be seated and retained on the seat (21), when the lid (30) is closed. The base portion (31) of the lid (30) comprises: a peripheral annular element (33) molded in plastic material, in a single piece with the retention portion (32); and a central element in the form of a sheet metal plate and having an outer peripheral edge (34a) attached to the peripheral annular element (33). The peripheral annular element (33) may incorporate, internally and in a single piece, a central panel (33d), disposed on the central element, which may be incorporated to the lid during its injection or attached thereto afterwards.

Description

Composite Lid for Containers {Composite Lid for Container}

FIELD OF THE INVENTION The present invention relates to a lid made of multiple materials, in particular having a tubular body having an annular top wall to place a lid that is formed to access the opening of the container and that is detachably joined and supported to close the container. A composite lid made of sheet metal or plastic material applied to a container formed of a generally can having a circular or polygonal cross section obtained from sheet metal or other material.

Lids of cans or other similar containers are well known in the art, which is formed of a single piece of stamped sheet metal or molded plastic material, covering the opening of the container and placing it on the sheet when the lid is closed. And a supporting portion supported on the outer periphery.

Lids formed of stamped sheet metal generally do not have a tamper secondary seal that projects radially outwardly and engages the support to cooperate with the upper edge region of the container body. These lids made of sheet metal have been used for many years and have shown structural changes in the foundation and support. However, even though they exhibit practical mechanical strength, adequate oxygen and water vapor impermeability, and adequate light-blocking properties, these metal lids are tamper-formed, separately formed to be applied to the vessel, either externally or internally to the lid to suit the determined application. Provide an incident sealing element.

On the other hand, the lid molded from the plastic material contemplated herein may be formed in a single piece, having a base, a support, a seal, and easily opened and closed to allow the user to gradually use the storage contained in the container. To ensure that the closure element with strength and non-invasiveness and adequate sealing properties can be obtained.

However, plastic molded lids present some limitations in some applications, particularly with respect to gas and water vapor impermeability and also effective light shielding, during long term shelf storage.

Another aspect to be considered with respect to the container is that the upper annular wall, which is attached to the end edge (upper edge) of the tubular body of the container to be double seamed or otherwise sealed to the outer periphery, is formed of stamped sheet metal. Under these conditions, the intermediate scraps of sheet metal resulting from stamping the upper annular wall are discarded as scrap, even if the sheet metal parts are subjected to the surface treatment required for application in making the container. None of the solutions of metal lids or plastic lids have solved the problem of discarding intermediate scrap resulting from stamping the top annular wall of the container.

Configurations for known synthetic lids made of plastic and sheet metal are disclosed and registered in C1 0401239-9. Said prior art document is a sheet metal having an outer periphery coupled to a support ring made of plastic material with sealing means to ensure axial support of the lid in closed condition and suitably adapted to rest on the upper edge of the tubular body of the container. It has a constructed base.

The above-mentioned configuration and the composite lid as defined in US Pat. No. 5,881,907, US 6,220,466, US 7,147,118, US 7,175,039 integrally cover the open top of the tubular body of the container and have a shape adapted to be placed to seal on the upper edge of the tubular body. A base made of sheet metal with an outer circumference, the axial support of the base being coupled to a support means which is selectively engageable with sealing means detachable from the first opening of the lid and which is provided on the outside of the tubular body of the container It has an annular or blind top flange which lies on the outer skirt and the metal base and is ensured by an annular outer element of plastic material.

However, the synthetic lid solution described above is applied to a container without a top wall to form a sheet of the lid, and the axial locking of the lid is by means such as curls, ribs or screws provided externally to the tubular body of the container. And is joined by a circumferential annular element with plastic material without any sealing function against the sheet for positioning the foundation integrally with the sheet metal.

In these known lids, the impermeability and light blocking properties of oxygen and water vapor are produced by the base integrally with sheet metal, which is combined with the sheet formed by the upper edge of the tubular body of the container without the aid or assistance of the intermediate resin sealing material. It must be correct to interact. These solutions represent a relatively complex configuration and a burdensome configuration, and it is not possible to apply lids that can be joined and supported on a sheet formed in the upper annular wall of the container.

The object of the present invention is to overcome the shortcomings and limitations of the lid of this type considered above, having a simple configuration that is less expensive than known synthetic lids, with or without a tamper-evident seal, and is formed of plastic material only. The present invention provides a lid made of sheet metal and plastic material that has improved impermeability to light (and other gases) and light blocking properties.

Another object of the present invention is to provide a lid as described above having a metal part formed by a stamping scrap.

Yet another object of the present invention is to provide a lid capable of safely stacking a container closed by the lid.

In order to achieve the above object, the lid of the present invention has a base portion which, when the lid is closed, is placed on the sheet of the upper annular wall of the container and the supporting portion is joined to the outer peripheral portion.

According to the invention, the base of the lid comprises an annular outer circumferential element formed in one piece with a support and cast from a plastic material; It has a central outer element in the form of a sheet metal plate with an outer peripheral edge attached to be sealed to the annular outer peripheral element. Considering the formation of the upper annular wall in the stamped sheet metal, the present invention allows the central element of the base of the lid to be formed by its own intermediate scrap from the stamping of the upper annular wall, so that the metal pieces of the composite lid are usually scraped. Formed into elements to be treated with.

The lid formed in accordance with the invention allows the support, which is a plastic material, to act as a sealing element in cooperation with the sheet as an element for assisting the lid to the tubular body of the container and to significantly lower the production cost, and to be opaque sheet metal that is gas impermeable. It has a total area formed into a plate and formed to close the container opening.

In a structural variant, the annular outer circumferential element is arranged on the central element and the closed central panel of plastic material is internally joined in one piece. In this case, the plastic piece formed by the annular outer element and the support by the center panel forms a hermetic closure barrier, which is bonded to the plastic material after casting or the plastic material of the annular outer element during injection of the plastic material of the lid. In the area where the central panel is joined with the metal center element, which may have a circumferential edge merged into it, it forms a downwardly reinforced sealing closure element.

The invention is described below with reference to the accompanying drawings, which are given by way of illustration in the embodiments of the invention.

1 is a perspective view showing a lid configuration according to the present invention.
FIG. 1A is a view similar to FIG. 1 but showing another configuration of a lid, which is the central element of the sheet metal covered entirely by the plastic material constituting the annular outer circumferential element and the support.
FIG. 2 is a partial cross-sectional view of the lid of FIG. 1 when joined on a sheet formed on the upper annular wall of the tubular body of the can in a cross-section taken along line II-II of FIG. 1.
2A is a partial cross-sectional view of a lid similar to FIG. 2 as a variation of FIG. 1A.
3 is a top perspective view of the central element of the base of the composite lid.
4 is a partial cross-sectional view of the central element of the lid taken on line IV-IV of FIG. 3.
FIG. 5 is a partial cross-sectional view of a lid similar to FIGS. 2 and 2A showing another structural variant according to a central element attached to the annular outer circumferential element after being cast by the radial support protrusion coupled to the annular outer circumferential element.
FIG. 6 is a partial cross-sectional view of a lid similar to FIGS. 2, 2A, and 5 for another structural variant according to a central element attached to the annular outer circumferential element after being cast through a thread coupled to the annular outer circumferential element.
7 is a top perspective view of the central element shown in the embodiment of FIGS. 5 and 6.
8 is a partial cross-sectional perspective view in which the upper annular wall obtained by stamping the central element of the base of the lid may be provided in an exploded view.

The composite lid of the present invention consists of a sheet metal and typically has a tubular body 10 having a cylindrical sidewall 11 with an upper annular wall 20, and also of sheet metal and against which the lid 30 is placed and supported. It is applicable to a container of the type having an opening A surrounded by the sheet 21. The upper annular wall 20 is formed or topped by a deformation of the side wall 11 of the tubular body 10 as disclosed in Brazilian patent application No. PI 0504528-2 (PCT / BR2005 / 000232) of the same applicant. As shown in FIGS. 2 and 8 by double seaming Rs, the method is different from the method obtained from a separate sheet metal circumferentially attached to the upper edge of the side wall 11 of the tubular body 10 and stamped. Can be formed.

Independent of the structure applied to the upper annular wall 20 (either one piece or single piece double seamed to the side wall 11 of the tubular body 10), the upper annular wall 20 until the tubular form is completed. In the illustrated configuration, the inner circumferential edge of which takes the form of a rib having a circular or substantially circular tubular cross section obtained bent downwards, upwards, outwards, so that the inner circumferential edge, around the opening A and the sheet 21 are formed. It is composed. However, the sheet 21 has a structure other than that which can not only axially support the lid on the sheet 21, but also associate with the form of the composite lid proposed herein to ensure the tightness of the container. You should know that For example, the sheet 21 may have a cross section formed by an arc with a well-extended portion that is tightly laid and supported by the well-coupled outer circumference of the lid.

As shown in FIG. 8, when the upper annular wall 20 is formed by stamping on the side wall of the tubular body 10 to form a pin metal and double seaming, the annular shape of the upper wall is typically rounded away by scrap. It is obtained by stamping an intermediate scrap R in the form of a flat disk.

According to the invention, the lid 30 has a base 31 on which the outer periphery is joined with the support 32 cast from a plastic material which is laid and supported relative to the sheet 21.

The base 31 of the lid 30 has an annular outer circumferential element 33 molded from a plastic material in one piece with the support 32, and an outer outer circumferential edge attached in a sealed or unsealed state to the annular outer circumferential element 33. And a central element 34 in the form of a sheet metal sheet. In particular, the outer circumferential edge 34a of the central element 34 is inserted and supported in the plastic material construction of the annular outer circumferential element 33, in the embodiment shown in FIGS. 1, 1A, 2 and 2A. 1 and 2, the outer circumferential edge 34a of the central element 34 is an annular outer circumferential element 33 because the central element 34 acts as a lid closure element, ie as a sealing element. Must be sealably supported in the plastic material structure of the substrate. In the embodiment of FIGS. 1A and 2A, the annular outer circumferential element 33 is engaged to close inwardly a single piece of the central panel 33d arranged on the central element 34. In this case, the support of the outer peripheral edge 34a of the annular outer peripheral element 33 made of plastic material need not be sealed.

When the upper annular wall 20 is attached to the container by upper double seaming Rs, the central element of the base 31 of the lid is stamped on the upper annular wall 20, as shown in FIG. It is formed by the obtained self intermediate scrap (R). As is known, the intermediate scraps R are produced by stamping the upper annular wall 20 before double seaming to the side wall 11 of the tubular body 10.

In the configuration shown, the annular outer circumferential element 33 of the base 31 made of plastic material is the outer side of the central element 34 made of sheet metal in the embodiment shown in FIGS. 1, 1A, 2 and 2A. It has an upper edge 33b made of a plastic material that surrounds and supports the outer circumferential edge 34a and is substantially overlapped with a single piece of inner circumferential wall portion 33a protruding upward in a cylindrical or truncated conical arrangement. The annular outer circumferential element 33 is also joined to the outer circumference with the outer cradle 35 which can be placed against the seat 21 to axially support the lid 30 in the closed condition and the annular outer circumference of the base 31. In the configuration shown, which takes a substantially cylindrical wall 32a spaced radially away from the inner circumferential wall portion 33a of the element 33, it is externally coupled in one piece to the lower region of the support 32. The annular outer circumferential element 33 can be separated from the inner circumferential wall 3a such that the outer circumferential edge 34a of the central element 34 receives and supports the construct of plastic material therein. In this case, the annular outer circumferential element 33 and the central element 34 are generally arranged on the same plane. However, this coplanar structure does not exhibit the advantages for proper structural strength, gain of the internal capacity of the container, and good lamination of the lid in the magazine in an automatic closing machine.

In addition, in the structure shown, the support 32 of the lid 30, in particular the substantially cylindrical wall 32a, is positioned above the upper annular wall 20 of the tubular body 10 when the lid 30 is closed. Overlapping engagement with the one-piece annular wall 36 protruding radially outwardly.

The annular wall 36 has an outer edge 36a which extends above the upper double seaming Rs or above the upper edge of the side wall 11 of the tubular body 10 when it is not equipped with the upper double seaming Rs. The outer edge 36a is engaged with the grip handle 37 projecting downward so that when the lid 30 is placed on the seat 21, it remains adjacent to the side wall 11 of the tubular body 10.

In order to avoid the laterally displaced two vertically stacked containers, the annular wall 36 is formed of another container 10 that is placed before being stacked, as shown in FIGS. 5 and 6 serving as stacking guides. Protrudes upwards from the annular wall 36 in a radially spaced or unspaced manner relative to the outer edge 36a of the annular wall 36 so as to be inwardly or outwardly loosely coupled from the lower end double seaming and continuously It may be combined with at least one outer lip extension (36b) formed in the form or segment.

In the embodiment shown in FIGS. 1, 1A, 2 and 2A the sheet metal plate of the central element is annular to sealably attach the central element 34 made of sheet metal to the annular outer element 33 made of plastic material. Hole 34c consisting of a sheet metal plate projecting outward from the plane of the outer circumferential edge through the hole 34b filled with the plastic material of the annular outer circumferential element 33 by the coupling of the central element 34 to the outer circumferential element 33. It is provided with a little space along the outer peripheral edge 34b having a plurality of spaced through holes 34b which can be deformed through. This coupling may be achieved, for example, by injecting the annular outer circumferential element 33 and the support 32 of a single piece of plastic material with the central element 34 already located in the mold. The outer circumferential edge 34a of the central element 34 may also be in the form of curled downwards, for example, to increase even more mechanical support between the sheet metal and the plastic material. For ease of handling of the central element 34 and for structural strength, a central groove 34d in the form of a spherical cap projecting downward may be provided with Dh.

In the configuration shown, the upper edge 33b of the inner circumferential wall 33a of the annular outer circumferential element 33 engages with the inner annular flange 33c and has an outer circumferential edge 34a of the central element 34 therein. Is supported. However, it is possible for other structural devices to be obtained for fixing, and if necessary, a sealing attachment of the central element 34 made of sheet metal to a single piece of plastic material is formed by the support and the annular outer element 33.

Another structural example of the lid 30 is shown in FIGS. 1A and 2A. In this structure, the annular outer circumferential element 33 has an upper edge 33b or radially inner region of the inner circumferential wall 33a to facilitate the printing of a message about the marking of the product on which the annular outer circumferential element 33 is to be packaged. To form a central panel 33d above the central element so as to extend in one piece over the entire extension of the central element 34. In this embodiment, the strength in the fixed area between the central metal element 34 and the annular outer circumferential element 33 need not be as high as required in the embodiment of FIGS. 1 and 2.

In other structural embodiments shown in FIGS. 5, 6 and 7, the annular outer circumferential element 33 is internally coupled in one piece to a closed central panel 33d made of plastic material, and in this configuration, In these embodiments, the central element 34 exhibits a substantially constant thickness along the entire area formed therein in the inner circumferential wall portion 33a such that the central element 34 is placed under the center panel 33d and axially supported. Has an outer circumferential edge 34a that is engaged and locked in a support means 38 provided in the annular outer circumferential element 33.

In a specific method, as already described in the above embodiments, the inner circumferential wall portion 33a having the upper edge 33b overlaps and is joined in one piece, and the upper edge 33b is annular edge edge 33. Is internally coupled to the single piece central panel 33d and the support means 38, which are provided internally in the inner circumferential wall portion 33a of the inner wall.

The support means 38 are joined by a plurality of q-a-head projections 38a and a single radial circumferential projection 38a in a single piece with respect to the inner circumferential wall 33a, as shown in FIG. When mounted to the center panel 33d, it is coupled to the outer peripheral edge 34a of the middle element 34.

The support means 38 may be formed by at least one thread 38b in a single piece on the inner circumferential wall 33a, as shown in FIG. 6, in which the lid is positioned with respect to the center panel 33d. Is coupled to the outer peripheral edge 34a of the central element 34 to allow it to be axially supported.

5 and 6, the upper edge 33b of the inner circumferential wall portion 33a is centered without the inner annular flange 33c of the embodiment shown in FIGS. 1, 1A, 2 and 2A. It can be directly coupled to the panel 33d. 5 and 6, a plurality of radially projecting elements spaced at an angle from a single piece of radially circumferential protrusion 38a may be cast from a plastic material to allow for simplification of the casting tool. A gap is formed therebetween to tightly engage the corresponding circumferential extension of the outer circumferential edge 34a of the central element 34, which then allows the lid 30 to be safely and easily attached under the center panel 3d. Slightly spaced apart from the center panel 33d.

While only a few embodiments of the invention are shown herein, it is to be understood that other forms of lids may vary in form or physical arrangement without departing from the constructive concepts defined in the claims appended hereto.

Claims (18)

An tubular body (10) formed with an opening (A) surrounded by a sheet (21), configured to receive and support a lid (30), and having an upper annular wall (20) made of sheet metal; In the composite lid for a container provided with a base portion 31 for coupling the support portion 32 to the outer circumference such that when the lid 30 is closed, it is held in the seat 21,
The base portion 31 includes an annular outer circumferential element 33 cast from a plastic material in one piece with the support portion 32; A composite lid for a container, characterized in that it has a central element (34) in the form of a sheet metal plate and having an outer peripheral edge (34a) attached to the annular outer circumferential element (33).
The method according to claim 1,
The upper annular wall 20 of the container is formed by stamping the intermediate strap R, and the central element 34 of the base 31 is formed by the intermediate strap R. Synthetic lid.
The method according to claim 1 or 2,
Said outer circumferential edge (34a) of said central element (34) is inserted into and supported in said annular outer circumferential element (33) of plastic material.
The method according to claim 3,
The annular outer circumferential element 33 is joined in one piece with the inner outer circumferential wall portion 33a projecting upward in a substantially cylindrical or truncated cone arrangement, which is coupled to the outer circumferential edge 34a of the central element 34. A composite lid for a container, characterized in that it has an upper edge (33b) made of a plastic material surrounding and supporting it.
The method according to claim 4,
The upper edge 33b of the inner circumferential wall 33a of the annular outer circumferential element 33 is engaged with the inner annular flange 33c and supports therein the outer circumferential edge 34a of the central element 34. Composite lid for a container, characterized in that.
The method according to claim 3 or 5,
The sheet metal plate of the central element 34 supports a plurality of through holes spaced apart so that the annular outer element 33 is filled with a plastic material as it supports the central element 34 with respect to the annular outer element 33. A composite lid for a container, characterized in that it is provided slightly spaced along the outer circumferential edge (34a) with 34b).
The method of claim 6,
Said through hole (34b) is formed by deforming the through hole (34c) of the sheet metal plate of said central element (34) protruding outward from the plane of said central element.
The method according to claim 3 or 5,
Said outer circumferential edge (34a) of said central element (34) is in the form of a curved curl.
The method according to claim 3,
A composite lid for a container, characterized in that it is hermetically supported of the outer peripheral edge (34a) of the central element (34) inside the annular outer peripheral element (33) made of the plastic material.
The method according to claim 3 or 9,
Said annular outer element (33) is a composite lid for a container, characterized in that a single piece of closed central panel (33d) arranged on said central element (34) is coupled therein.
The method according to claim 1 or 2,
The annular outer circumferential element 33 is coupled to the outer circumference of the annular outer circumferential element 33 so as to be locked to the support means 38 provided in the annular outer circumferential element 33 so that the central element 34 placed under the center panel 33d is axially supported. A composite lid for a container, characterized in that the central element (34) having an edge (34a) and a single closed central panel (33d) are coupled therein.
The method of claim 11,
The annular outer circumferential element 33 is internally coupled in one piece to the support means 38 and the central panel 33d provided therein in the inner outer circumferential wall portion 33a of the annular outer circumferential element 33. A composite lid for a container, characterized in that it overlaps with and engages with an inner circumferential wall portion (33a) consisting of a single piece projecting upward in a substantially cylindrical or truncated conical arrangement.
The method of claim 12,
The support means 38 are formed by at least one radial projection 38a coupled in one piece to the inner circumferential wall 33a and, when mounted under the center panel 33d, the central element ( 34. A composite lid for a container, characterized in that it is coupled to an outer circumferential edge 34a.
The method of claim 12,
The support means 38 is formed by at least one thread 38b coupled in one piece to the inner circumferential wall 33a and, when mounted under the center panel 33d, the central element 34. Composite lid for the container, characterized in that coupled to the outer peripheral edge (34a) of the.
The method according to claim 3 or 11,
The annular outer circumferential element 33 is in the form of a substantially cylindrical wall 32a which is joined to the outer circumference and the outer cradle 35 which will be placed against the seat 21 as the lid 30 is closed. Composite lid for the container, characterized in that combined in one piece overlapping the lower region.
The method according to claim 15,
The support part 32 of the lid 30 is a single piece of annular wall protruding radially outward so that when the lid 30 is closed, it is positioned above the annular upper wall 20 of the tubular body 10. 36) A composite lid for a container, characterized in that overlapping and combined.
The method according to claim 16,
The annular wall 36 has an outer edge 36a and is coupled with a grip handle 37 projecting downwards therein, the grip handle 37 having the lid 30 with the seat 21. Composite lid for a container, characterized in that it is configured to be in close contact with the side wall (11) of the tubular body (10) upon being placed on.
The method according to claim 16,
Said annular wall (36) is a composite lid for a container, characterized in that it combines with at least one outer lip extension (36b) protruding upwards to act as a stacking guide.

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