FR2535687A1 - Paint or varnish container with sealable lid - Google Patents

Abstract

The paint or varnish container (10) is of a sheet metal construction and uses a lid (11) with a sealing gasket (22). The container walls are folded over to form a radially projecting lip (18) which has an inverted section of which the outer leg (33) returns externally square (34) to form a rebate (32). The lid has walls (19) of a form complementing those of the container, having an external top edge flange (23) which rolls under (21) to define a groove (20) locating the gasket.The overall radial width of the inverted 'U' section rim is less than the corresponding width (L) of the groove, and a bulbous lid toe (29,37) clips behind inclined drum wall zone (36) to ensure that the lip penetrates a gasket of compressible material.

Description

 The present invention relates generally to packages of the kind formed generally of a body, for example cylindrical or frustoconical and of a plug, or cover, of the so-called reentrant type, adapted to be engaged in a removable manner in the outlet of said body.

 It relates in particular, but not exclusively, to those of these packages which are commonly called "truck pots".

 Such packages, which are in practice metallic, their body resulting for example from the rolling of a metallic sheet on itself, to form a side wall, and from the crimping of a bottom at the lower end of it. Ci, are usually used for the packaging in bulk of very diverse products, such as paints, glues or varnishes for example.

 They must therefore lend themselves satisfactorily to various constraints, such as mechanization of loading, mechanization of capping, low price, tightness, and holding of the cap despite possible internal overpressures due for example to a possible volatility at least partial of the content.

 In addition, due to a possible aggressiveness of this content, it is preferable that, in order to accept If necessary an interior coating, their body does not internally exhibit zones, such as end slices of the sheet from which their side wall is formed, where the protection of the metal constituting such a sheet is difficult.

 This is one of the reasons why it is commonly proposed to date to form, on the periphery of the outlet of the body, such packages, in one piece with the side wall of this body, in continuity with the latter, a rolled edge projecting radially outward.

 Indeed, this arrangement, which implies in practice that the edges of the rolled sheet of which such a body is made are electrically welded, and not stapled, the rolling of stapled edges can only subject to excessive stress the metal of which such a sheet indeed makes it possible to transfer the corresponding terminal portion thereof to the outside.

 It also advantageously leads to packaging of the full opening type, that is to say packaging the opening of which takes place at full opening, without shrinking due to a possible ball specific to the engagement of the stopper, said plug then comprising azeul2arement, at its periphery, a side wall which is complementary to that of the body.

 To further ensure the disengageable retention of the plug on the body, it has already been proposed to provide, between the plug and the body, snap-fit surfaces capable of cooperating with one another? 'one on the side wall of the body, the other on that of the plug, in cooperation with, on the plug, around the side wall thereof, a groove in which, to ensure joint.

ment the desired seal, is usually installed a seal.

 Such an arrangement is notably described in the English patent N 714,978, and in the French patent published under N 2,241,465.

 In practice, the latching surfaces thus provided for in these patents are grooves with a cross-section substantially in a semicircle, formed in a complementary manner on the side walls of the body and of the plug, the parts of such a side wall arranged at- above and below such a groove having radially substantially the same dimensions and thus being substantially in the extension of one another.

 In English Patent No. 714,978, the groove of the plug, and / or that of the body, is formed after engagement of the plug in said body.

 As a variant, in French patent N 2,241,465, such a groove is preformed in advance, both for the plug and for the body.

 Anyway, at the end of the engagement of the stopper in the outlet of the body, the latching surfaces thus provided between this stopper and this body come into engagement with each other, with corollary axial compression. of the seal also implemented, and, remaining in engagement with each other, they ensure, with good security, the durability of this axial compression, guaranteeing the desired seal.

 Although they are likely, at least for certain applications, to be satisfactory, such packages have drawbacks, in particular with regard to their opening.

 Indeed, it turns out to be difficult.

 The reason is, in particular; that the grooves forming in practice the latching surfaces used lead to significant contact friction, which must be overcome, between the plug and the body.

The reason is also that, in practice, in the English patent N 714,978 and in the French patent
N 2,241,465, the grip offered by the plug to act on it is reduced.

 Indeed, in both of these patents, the edge of the cover, which is possibly fragmented into legs, is folded under the rolled edge of the body.

In addition that such a folding of the edge of the cover under the rolled edge of the body requires, when closing, a special tool, it makes it difficult, when opening, the action of a tool or any other instrument. , such a tool or such an instrument not being able to effectively take support on the corso
However, it is also known, in particular in so-called "penny" boxes, to provide, at the periphery of the stopper, a rolled edge, which, if a groove is also provided for the implantation of a seal sealing, in practice borders such a groove.

 This rolled edge of the cover, which does not intervene in any way in the retention of the seal, the latter adhering sufficiently by itself to the bottom of the groove in which it is implanted, is arranged in line with the rolled edge. from the body.

 It is therefore possible, using any instrument, a penny or a screwdriver for example, suitably inserted between the rolled edge of the Body and that of the plug, to rest on the rolled edge of the body to push back the plug, which normally allows easy packaging of the packaging in question.

 However, in packaging of this type known to date, the rolled edge of the stopper is in practice very close to that of the body when the latter is closed, so that it is not always easy to insert therein. 'instrument to be used for the desired opening.

 To overcome this difficulty, it has been proposed in the French patent published under No. 2,387,855 to provide, from place to place, on the rolled edge of the cap, creations capable of facilitating, upon opening, the intervention of an instrument.

However, this provision itself has the disadvantage of being able to sometimes lead to gaps in sealing.
Indeed, thus practiced on the rolled edge of the stopper, the slots used can lead in particular to local deformations of the bottom of the groove in which the seal is implanted, and therefore to modifications. local working conditions thereof0
In all cases, whether there are such slots or not on the rolled edge of the cover, the proximity of the latter with respect to the rolled edge of the body, whether between slots when these exist, is such as to be able to lead to untimely parasitic contacts between these rolled edges, to the detriment of the axial compression desired for the seal, and therefore to the detriment of the seal obtained.

 The present invention generally relates to provisions which make it possible to avoid these drawbacks while satisfying the various requirements succinctly recalled above.

More specifically, it relates to a packaging of the kind comprising a body, the side wall of which forms, in one piece, at the periphery of its outlet, a rolled edge radially projecting outwards, and a plug. , there is a cover, which, of the so-called "re-entrant" type is adapted to be removably engaged in the outlet of said body, and which annularly, for this purpose, at its periphery, a side wall complementary to that of said body, with around this, a rolled edge, this packaging being, according to a first aspect, generally characterized in that, in line with the rolled edge of the cap, the rolled edge of the body comprises, at least locally, a dropout 4
Such an offset, which, when opened, is intended to facilitate the insertion of any instrument between the rolled edge of the body and that of the plug, therefore affects, according to the invention, not the rolled edge of the plug , but that of the body
It is thus advantageously without interference with the conditions of implantation, and therefore of work, of the seal possibly, but preferably, implemented, which can therefore safely assume its sealing function e
Preferably, the recess thus presented according to the invention the rolled edge of the body extends annularly continuously throughout the latter.
As a result, no untimely contact is to be feared between the rolled edge of the plug and that of the body, so that the axial compression of the seal, if any, is advantageously fattened in a uniform manner. along this one
According to a second aspect, the packaging according to the invention is further characterized in that, snap-on surfaces suitable for cooperating with each other being provided, one on the side wall of the body, the 'other on that of the plug, for releasable retaining this when it is engaged in the outlet of said body, the latching surface thus presented by the side wall of said body is a simple generally frustoconical surface, the part of this side wall disposed above this latching surface being radially recessed inwardly relative to its part disposed below the latter.

 Preferably, the latching surface which the joint side wall of the plug then presents is also a simple, generally trcnccnic surface.

 Anyway, from the simple fact that the latching surface presented by the side wall of the body needs a simple generally frustoconical surface, the contact friction between the plug and the body when their latching surfaces are in engagement is advantageously reduced.

 The opening of the plug is advantageously made easier, in conjunction with the ease of insertion of an instrument between the rolled edges in question due to the detachment which, according to the invention, presents that of the body.

 In addition, such frustoconical snap-on surfaces are easy to produce in advance, both on the stopper and on the body, using for example a conventional mage-shaped material, such as a crimper or the like.

 In short, the packaging according to the invention has the advantages of an acceptable cost price, of a seal provided in complete safety when a seal is applied, without risk of parasitic contact between the rolled edges of the stopper and of the body, and of an effective holding of the stopper despite possible limited internal overpressures, this stopper is also advantageously suitable for unclogging and recapping particularly easy.

The characteristics and advantages of the invention will become apparent from the description which follows, by way of example, with reference to the appended schematic drawings in which
Figure 1 is, with local cutaway, a partial exploded view of a package according to the invention, for the opening configuration thereof
Figures 2, 3 show, each respectively, on a larger scale, the details of Figure 1 identified by inserts II, III on it
Figure 4 is, on the scale of Figures 2, 3, a partial view in axial section of the packaging according to the invention, for the closed configuration thereof.

These figures illustrate, by way of example, the application of the invention to packaging of the "truck truck" type.
In a manner known per se, such a package comprises, overall, a body 10, forming a bucket, and a cover 11, of the so-called "reentrant" type, adapted to be removably engaged in the outlet 12 of said body 10.

 As shown, the body 10 is generally conical.

 Alternatively, it may as well be cylindrical.

Anyway, it is preferably a body of revolution, and, as a corollary, the cover ll has a circular outline
In practice, the body 10 is metallic 9 and the same is true of the cover 11.

 For example, and in a manner known per se, the body 10 may consist of a side wall 13, and a bottom, not visible in the figures, suitably attached, for example by crimping, to the lower end of this side wall 13, the latter being itself formed by rolling on itself a metal sheet whose edges are suitably secured to one another follows a generator, for example by electric welding.

Since such arrangements are well known in themselves, and are not part of the present invention, they will not be described in more detail here,
It will be the same, both with regard to the molding 15 which is present in the embodiment shown in the body EO, projecting outwards, near its outlet 12, possibly in combination with other moldings of same type distributed over its height, as with the handle 16 which, to facilitate handling, is attached to it externally, in this embodiment, by means of swivel tips 17 suitably secured, for example by welding, to its side wall 13.

 In a manner also known per se, the side wall 13 of the body 10 forms, in one piece, at the periphery of the outlet 12 thereof, a rolled edge 18, which is radially projecting outwards, and which will be described in more detail later.

 To be adapted to be engaged in a removable manner in the outlet 12 of the body 10, the plug it comprises, annularly, at its periphery, a side wall 19 complementary to the side wall 13 of said body 10 to said outlet 12 of that -this.

 In cooperation with this side wall 19, the plug 11 comprises, around the latter, in the embodiment shown, a groove 20, which is bordered by a rolled edge 21, and in which a seal is implanted 22.

 In the embodiment shown, the bottom 23 of the groove 20 extends transversely in a substantially planar manner, perpendicular to the axis of the assembly, and the rolled edge 21 has, axially, a substantially circular cross section.

 In a manner known per se, the seal 22 can result from the simple spite, in liquid form, in the groove 20, of a material remaining elastically deformable after it has set.

 As a variant, it may be a preformed seal, suitably placed in the groove 20.

 Anyway, it preferably adheres to the metal constituting the plug 11, either as a result of its in situ formation process in the groove 20 thereof, or by gluing.

 Anyway, also, it has, preferably, axially, a height 111 greater than or equal to that 112 of the rolled edge 21 which flanks it.

 As described above, the side wall 19 of the plug 11 delimits, towards the inside, a groove 20, with a concavity directed downwards.

 In the embodiment shown, it also delimits, outwards, a groove 25, with a concavity directed upwards.

 In addition to this side wall 19, this groove 25 is delimited, inwards, by an axial wall 26, which forms a U with said side wall 19, in continuity with the latter, and which is itself continuous, on the side opposite said side wall 19, with a transverse wall 27 forming the central face of the plug II.

 As shown, this transverse wall 27 may include annularly one or more steps 28.

 It can also include annular other circular deformations, such as rods, moldings, or corrugations.

 As will be noted, the bottom of the throat 25 of the plug is very widely rounded, so that there is provided a rounded connection leave both on the side of the axial wall 26 and on the side of the side wall. 19.

 For reasons which will appear below, the radius of curvature of the connection leave 29 thus provided on the side of the side wall 19 is greater than that of the connection leave 3a also thus provided on the side of the axial wall 26.

 As is easy to understand, the stopper thus formed can for example between produced by stamping and rolling.

 According to the invention, and according to a first aspect thereof, in line with the rolled edge 21 of the plug 11, the rolled edge 18 of the body 10 comprises, at least locally, a recess 32.

 Preferably, and as shown, this offset 32 do rolled edge 18 of the body 10 extends annularly continuously throughout thereof.

 In practice, as shown, it is delimited on the one hand by an axial wall 33 forming an inverted U with the side wall 13 of the body 10, in continuity with the latter, and on the other hand by a transverse wall 34, which, in continuity with said axial wall 33, extends substantially at right angles, towards the outside, relative to the latter.

 Preferably, and as shown, beyond the preceding transverse wall 34, the rolled edge 18 of the body 10 continues, closing substantially in a hook on itself, near the side wall 13 of said body 10, or even in contact with it.

 In practice, the thickness E1 that the inverted U formed radially by the rolled edge 18 of the body 10 is less than the radial width L of the groove 20 that the plug 11 presents to you as a corollary for the implantation of the seal 22 .

 Furthermore, in the embodiment shown, and in a manner known per se, snap-on surfaces 36, 37 suitable for cooperating with each other are preferably provided, one on the side wall 13 of the body. 10, the other on the side wall 19 of the plug II, for disengageable retention of said plug 11, with axial compression of the seal 22, when this plug 11 is engaged in the outlet 12 of said body 10.

 According to the invention, and according to a second aspect thereof, the latching surface 36 thus presented by the side wall 13 of the body 10 is a simple generally frustoconical surface, the part of said side wall 13 disposed above this latching surface 36 being radially recessed inwardly relative to its part disposed below the latter.

 Jointly, the snap-fastening surface 37 which corollarily has the side wall 19 of the plug 11 is also, according to the invention, a simple generally frustoconical surface.

To be at least partly complementary to that of the body 10, it widens towards the base
This is the reason why the connection leave 29 forming the bottom of the groove 25 of the plug 11 on the side of the side wall 19 thereof has a radius of curvature greater than that of the connection leave 30 forming this bottom of the side of the associated axial wall 26.

 The conicity C1, with respect to the vertical, of the latching surface 36 that has the side wall 13 of the body 10 is for example of the order of 300.

 It goes without saying, however, that such a value, which is preferred, should in no way be considered as limiting the invention.

 Preferably, in order to limit contact friction, the conicity C2g with respect to the vertical, of the surface a9 snap-fit 37 which corollarily has the side wall 19 of the plug ll is less than that Cl of the snap-on surface 36 of the body 10 .

 For example, and as shown 9 it is less than half that of this one.

 In the context of the numerical example given above, it is therefore of the order of 150.

Anyway, the snap-on surfaces 36537 thus provided on the body 10 and the plug 11 being simple generally frustoconical surfaces, they can easily be formed in advance on this body 10 and on this plug îî, at the using conventional forming equipment, such as a crimper for example0
In practice, upon closing, and at the end of the corresponding axial engagement of the plug ll in the outlet 12 of the body 10 according to the arrow F in FIG. 4, the snap-on surfaces 36, 37 provided according to the invention between this body 10 and this plug li come into engagement with each other.

 This results in a satisfactory retention of the plug 11 on the body 10, with axial compression of the e-seal 22, the U formed upwards by the rolled edge 18 of the body 10 on the margin of the recess 32 thereof. having entered the groove 20 of the plug 11.

Of course, during the axial engagement of the plug 11 in the body 10, there is not only an elastic deformation of the sealing jo-int 22, with a partial creep of the latter between the rolled edge 18 of the body 10 and the rolled edge 21 of the plug 11, but also, radially, an elastic deformation of the island plug
Thanks to the recess 32 which presents according to the rolled edge 18 of the body 10, there remains, axially, a large gap E2 between the rolled edge 21 of the plug 11 and this rolled edge 18 of the body 10, without risk of any contact. nuisance parasite between such rolled edges
In addition, at the opening, this gap C2 advantageously facilitates the insertion, between the rolled edge 18 of the body 10 and the rolled edge 21 of the plug 11, of any instrument suitable for making this opening easier.

 As will be noted, the bottom 23 of the groove 20 of the plug 11 in which the seal 22 is implanted, and, more generally, all of the walls delimiting this groove 20, permanently retain a determined configuration, guaranteeing determined working conditions for the seal 22, and therefore guaranteeing the seal which the latter must provide.

 As will also have been noted elsewhere, the connection leave 29 with a large radius of curvature formed by the bottom of the groove 25 of the plug ll on the side of the side wall 19 of the latter is advantageously such as to allow a rigorous and precise stacking of such a bottom on another, this connection leave 29 then coming to bear on the upper axial end, it rounded mummy, of the side wall 19 of the underlying plug 11.

Of course, the present invention is not limited to the embodiment described and shown, but encompasses any variant of execution.
Its field of application is not limited either to that of "truck pots" but extends more generally to that of packages whose body and cover are bordered by a rolled edge.

 This is the case, for example, of packaging of the so-called "penny box" type, which are generally of smaller capacity than that of "truck pots", and which do not have latching surfaces between their body and the cover, but simple engagement surfaces allowing, by appropriate dimensional tolerances, a suitable maintenance of such a plug in such a body, with or without seal.

Claims (10)

 1. A packaging of the kind comprising a body (10), the side wall (13) of which forms, in one piece at the periphery of its outlet (12), a rolled edge (18) radially projecting outwards, and a plug (il), or cover, which, of the so-called 9'rentrant "type, is adapted to be removably engaged in the outlet (12) of said body (10), and which comprises, annularly, for this purpose, at its periphery, a side wall (19) complementary to that of said body, with, around it, a rolled edge (21), characterized in that, in line with the rolled edge (21) of the plug (ll), the rolled edge (18) of the body (10) comprises, at least locally, a recess (32) o  2.Packaging according to claim 1, characterized in that the recess (32) of the rolled edge 618) of the body (10) s1 annularly extends continuously throughout the latter.  3. Packaging according to claim 2, characterized in that the recess (32) of the rolled edge (18) of the body (10) is delimited on the one hand by an axial wall (33) forming an inverted U with the side wall ( 13) of the body (10), in continuity with the latter, and on the other hand by a transverse wall (34), which, in continuity with said axial wall (33), extends substantially at right angles, towards the outside, relative to it,  4.Packaging according to claim 3, wherein the plug (11) has a groove (20), which is bordered by its rolled edge (21) and in which is installed a seal (22), characterized in that , radially, the thickness (El) of the inverted U formed by the rolled edge (18) of the body (10) is less than the width (L) of the groove (20) thus presented by the plug (11) for the installation of the seal (22).  5. Packaging according to any one of claims 1 to 4, in which snap-on surfaces (36,37) suitable for cooperating with each other are provided, one on the side wall (13) of the body (10), the other on that (19) of the plug (II), for disengageable retention of the latter when it is engaged in the outlet (12) of the body (10), characterized in that the surface dSeneliguetage (36) that the side wall (13) of the body (10) has is a generally frustoconical surface, the part of said side wall (13) disposed above this latching surface (36) being radially in withdrawal towards the interior with respect to its part disposed below it.  6. Packaging according to claim If characterized in that the latching surface (37) that has the side wall (19) of the plug (11) is also a simple generally frustoconical surface.  7. Packaging according to claim 6, characterized in that the taper (C2) of the latching surface (37) that has the side wall (19) of the plug (11) is less than that (C1) of the surface d 'snap (36) that has the side wall (13) of the body (10).  8. Packaging according to claim 7, characterized in that the taper (C2) of the latching surface (37) that has the side wall (19) of the plug (11) is substantially equal to half of the taper (bottom ) of the latching surface (36) which has the side wall (13) of the body (10).  9. Packaging according to any one of claims 5 to 8, characterized in that the taper (C1) of the latching surface (36) that has the side wall (13) of the body (10) is of the order of 300.  10. Packaging according to any one of claims 1 to 9, in which the side wall (19) of the plug (11) externally delimits a groove (25), characterized in that, on the side of said side wall (19), the bottom of said groove (25) forms a connection leave (29) with a large radius of curvature.