Transportable container and associated hinge

Abstract

A transportable container comprising at least one first half-shell (2), a second half-shell (3) and a hinge (100) provided with at least one first member (101), anchored to the first half-shell (2), and a second member (102), anchored to the second half-shell (3) and rotatably coupled to the first member (101), for the mutual articulation of the half-shells (2, 3) between a first extreme angular configuration, for closing an inner compartment (7), and a second extreme angular configuration, for maximum opening and free access to the compartment (7). The first member (101) comprises a first longitudinal rib (104) and a second longitudinal rib (105), which protrude from the lateral surface of the first member (101) and are oriented parallel to the axis of articulation (A) formed by the hinge (100); at the second extreme configuration the first longitudinal rib (104) and the second longitudinal rib (105) are arranged so as to interfere with the rotational travel, about the axis of articulation (A) and toward the first configuration, of a first perimetric flap (3a) and a second perimetric flap (3b), respectively, of the second half-shell (3).

Description

[0001] The present invention relates to a transportable container and to an associated hinge.

[0002] The category of transportable containers encompasses a heterogeneous range of constructive solutions, which can include trunks, crates, suitcases, trolleys, backpacks, bags, and more. These products differ in shape, size, materials and / or functionality, as well as in their intended use, the type of goods that can be placed inside them and / or the target customers.

[0003] Among the many possibilities offered by the market, containers are known which have a box-like shape and comprise a pair of mutually articulated half-shells, made of high-strength rigid (polymeric) material, so as to ensure that they can withstand even intense impacts without deforming and, above all, without compromising the integrity of what is accommodated in the inner compartment, delimited by the half-shells in the closure configuration.

[0004] Moreover, high impact resistance is often associated with effective insulation properties of the inner compartment, achieved in the container's closed configuration by virtue of gaskets and other solutions that prevent air, water, moisture or dust from entering.

[0005] These prerogatives are particularly appreciated, mainly in professional settings but sometimes also in a private context, whenever it is necessary to accommodate in the container electronic devices or otherwise shock- and stress-sensitive instruments, such as for example photo / video equipment, computers, optical or medical devices, weapons and ammunition, or more.

[0006] Specifically when the container is designed to house a computer or otherwise a device with which to interact in a similar way, the need is also felt to ensure the temporary mutual locking of the half-shells in an open configuration, so as to allow the user to use the device while keeping it inside the compartment, without the risk of accidental closures of the container.

[0007] Known solutions prove to be at most adequate in heavier containers, but are often ineffective when the walls of the half-shells are made of lightweight materials (as is increasingly being demanded by the market), which, while meeting the stiffness requirements mentioned in the paragraphs above, have greater deformability (such as to circumvent the simple mechanical constraints that are provided for the desired locking).

[0008] Another need often felt, in particular precisely when the container accommodates instrumentation or devices of various kinds, is to be able to quickly (but reversibly) uncouple the half-shells. In known solutions, this result is achieved with solutions that are often complex and onerous in terms of production costs.

[0009] The aim of the present invention is to solve the problems described above by providing a transportable container that can be effectively immobilized in an open configuration.

[0010] Within this aim, an object of the invention is to provide a hinge that allows to effectively immobilize the container in an open configuration.

[0011] Another object of the invention is to provide a container and a hinge that allow uncoupling of the half-shells at at least one relative angular disassembly position.

[0012] Another object of the invention is to provide a container and a hinge that ensure high reliability of operation.

[0013] Another object of the invention is to provide a container and a hinge that adopt a technical and structural architecture that is alternative to those of conventional solutions

[0014] Not least object of the invention is to provide a container and a hinge that are easily obtainable starting from commonly commercially available elements and materials.

[0015] Yet another object of the invention is to provide a container and a hinge that have low costs and are of assured application.

[0016] This aim and these and other objects that will become better apparent hereinafter are achieved by a container according to claim 1 and by a hinge according to claim 10.

[0017] Further characteristics and advantages of the invention will become better apparent from the description of a preferred but not exclusive embodiment of the container and of the hinge according to the invention, illustrated by way of non-limiting example in the accompanying drawings, wherein: Figure 1 is a partially exploded perspective front view of the container according to the invention, provided with two hinges according to the invention; Figure 2 is a top view of the container of Figure 1; Figures 3 and 4 are views of highly enlarged details of Figures 1 and 2, respectively; Figure 5 is a front perspective view of the container of Figure 1, in the second extreme angular configuration; Figure 6 is a rear perspective view of the container of Figure 5; Figure 7 is a top view of the container of Figure 5; Figure 8 is a sectional view of Figure 7, taken along the plane VIII-VIII; Figure 9 is a view of a highly enlarged detail of Figure 8; Figure 10 is a view of a highly enlarged detail of Figure 5; Figures 11 and 12 are views of highly enlarged details of Figure 6; Figure 13 in practice is a view of the same detail of Figure 12, seen from behind; Figure 14 in practice is a view of the detail of Figure 12, in the sectional view of Figure 7 taken along the plane XIV-XIV; Figure 15 is a rear perspective view of the container of Figure 1, in the first extreme angular configuration; Figure 16 is the same sectional view as Figure 8, with the container in the angular configuration of Figure 15; Figure 17 is a view of a highly enlarged detail of Figure 16; Figure 18 is a view of a highly enlarged detail of Figure 15; Figure 19 is a rear perspective view of the container of Figure 1 in an intermediate angular configuration; Figure 20 is the same sectional view as Figure 8, with the container in the angular configuration of Figure 19; Figure 21 is a view of a highly enlarged detail of Figure 20; Figure 22 is a view of a highly enlarged detail of Figure 19.

[0018] With reference to the figures, a transportable container comprising at least one first half-shell 2, a second half-shell 3, and a hinge 100 is generally designated by the reference numeral 1.

[0019] The container 1 can comprise any number of hinges 100: in fact, for example, the container 1 in the accompanying figures comprises two hinges 100, which are mutually aligned. What will be stated hereinafter in relation to "a" hinge 100 is to be understood to extend to any number of hinges 100 that may be included in the container 1.

[0020] Likewise, any reference that will be made to containers 1 in the present description is to be understood as extending to any type of product capable of accommodating objects and tools of various types, whether for private or professional use, facilitating their subsequent transport.

[0021] Within the protective scope claimed herein, in fact, tools, apparatuses, electronic equipment or others, in professional use, as well as clothing, objects of various kinds and personal items, in private use, can be housed in the container 1.

[0022] In the preferred application shown in the accompanying figures, the container 1 is adapted for mainly professional use and is a sort of trunk or suitcase, made of a polymeric material that provides adequate rigidity and high impact resistance. Preferably, the container 1 can be provided with appropriate solutions that ensure complete airtightness and thus the ability to prevent the entry of water, moisture, dust and contaminants in general, which otherwise could damage the instrumentation and delicate apparatuses that especially in professional uses are often carried inside it.

[0023] Typically (not necessarily), one of the half-shells 2, 3 serves as the base (the first half-shell 2 in the accompanying figures), while the other is in practice a lid.

[0024] However, it is to be noted that the scope claimed herein also includes other types of containers 1 made of any material.

[0025] Moreover, numerous complementary devices and solutions, such as handles 4, locks 5, valves 6 for controlling internal pressure, casters, telescopic handles, etcetera, can be associated with the half-shells 2, 3 and in general with the container 1.

[0026] The hinge 100 is provided with at least one first member 101, anchored to the first half-shell 2 (they can also be provided monolithically, by molding or otherwise), and with a second member 102, anchored to the second half-shell 3 (they can also be provided monolithically, by molding or otherwise).

[0027] The second member 102 is rotatably coupled to the first member 101 to ensure mutual articulation of the half-shells 2, 3 between a first extreme angular configuration (the one for example in which the container 1 and the hinge 100 are shown in Figures 15-18) and a second extreme angular configuration (Figures 5-14).

[0028] In the present description, an "angular configuration" is generically means any relative position of the two half-shells 2, 3 (and of the two members 101, 102), which can be obtained by rotating one half-shell 2, 3 (typically the second half-shell 3) around the other, with respect to the axis of articulation A formed by the hinge 100 (by its members 101, 102).

[0029] The first extreme angular configuration is the configuration for closure (by the half-shells 2, 3) of an inner compartment 7 (internal to the container 1), intended indeed to accommodate instruments or objects of various kinds. The compartment 7 is typically delimited indeed by the half-shells 2, 3, when they are in the first extreme angular configuration.

[0030] The second extreme angular configuration is instead the one for maximum opening and free access to the compartment 7. For example, in the accompanying figures the second extreme configuration is obtained, starting from the first extreme configuration, with a rotation of slightly more than 90° (equal to 95°, for example).

[0031] A further opening stroke is prevented in various ways, for example (Figure 9) by providing the first member 101 with a protruding ridge 103 that acts as a stroke limiter for the (opening) rotation of the second member 102 relative to the first.

[0032] So far, however, the transportable container 1 and the hinge 100 are substantially of the known type; the person skilled in the art will be able to choose the most appropriate components and devices that in each instance are most appropriate to best configure the solution to be offered to the public.

[0033] According to the invention, the first member 101 comprises a first longitudinal rib 104 and a second longitudinal rib 105, both of which protrude from the lateral surface of the first member 101 and are oriented parallel to the axis of articulation A.

[0034] The ribs 104, 105 are not mutually aligned: they can be (preferably) arranged side by side, as in the accompanying figures, or even staggered, but in any case indeed they are not arranged along a same imaginary straight line, for reasons that will become evident hereinafter.

[0035] At the second extreme configuration, the first longitudinal rib 104 and the second longitudinal rib 105 are arranged so as to interfere with the rotation stroke, around the axis of articulation A and toward the first configuration, of a first perimeter flap 3a and of a second perimeter flap 3b of the second half-shell 3, respectively (as clearly shown for example in Figure 9).

[0036] In greater detail, the ribs 104, 105 are configured to effectively contrast a force that tends indeed to rotate the second half-shell 3 with respect to the first, up to a predefined intensity, beyond which, for example by elastic forcing, rotation is allowed anyway, indeed to allow the closure of the container 1 (the return to the first extreme angular configuration). That is to say, the resistance offered by the ribs 104, 105 is such as to avert the danger of accidental closure but not (obviously) prevent intentional closure by the user.

[0037] A similar resistance is obviously offered by the ribs 104, 105 when an attempt is made to open the container 1, and thus when arriving proximate to the second extreme angular configuration by rotating the second half-shell 3 in the opposite direction.

[0038] In practice, therefore, in the second configuration the stroke limiter prevents a further opening rotation, while the closing rotation is prevented by the ribs 104, 105: thus the intended aim is achieved, since in the second extreme angular configuration (of maximum opening) the immobilization of the half-shells 2, 3 is obtained. In it, the second half-shell 3 and the second member 102 are in practice "trapped" between the stroke limit and the ribs 104, 105, which prevent any accidental relative movement, ensuring the stability of the container 1 and also avoiding, in practice, any oscillation.

[0039] It should be noted that the stroke limiter constituted by the ridge 103 is preferably placed so as to hinder the further rotational travel of the first perimeter flap 3a of the second half-shell 3, which is prevented from rotating, in the opposite direction, by the first longitudinal rib 104. This condition is clearly shown in Figure 9, which also shows how the rotation of the second perimeter flap 3b is hindered by the second rib 105.

[0040] In the embodiment shown in the accompanying figures, which is of considerable practical interest but does not limit the application of the invention, the first member 101 comprises a block 106 (which is at least partially cylindrical), which is anchored to the first half-shell 2, and a pivot 107, which extends from the block 106 and is rotatably inserted into a hole 108 provided in the second member 102, so as to obtain the mutual articulation of the half-shells 2, 3 with respect to the axis of articulation A, which in this case coincides with the axis of longitudinal symmetry of the pivot 107.

[0041] In this embodiment (and as can be clearly seen from the accompanying figures), the ribs 104, 105 (and the ridge 103) are provided along the lateral surface of the block 106.

[0042] In particular, the pivot 107 can be made of metal or otherwise be a separate body from the block 106 and can be partially embedded in the latter (as in the accompanying figures). However, the possibility of providing the block 106 and the pivot 107 monolithically is not excluded.

[0043] More particularly, and with further reference to the preferred but not exclusive embodiment of the accompanying figures, the perimeter flaps 3a, 3b are constituted by respective edges of a contoured protrusion 8 (one for each hinge 100), which protrudes from an edge of the second half-shell 3.

[0044] Usefully, the ribs 104, 105 are connected by at least one groove 109, which protrudes transversely from the lateral surface of the first member 101 (of the block 106), remaining however at a height that does not exceed that of the ribs 104, 105. The hinge 100 may be provided with any number of grooves 109, typically but not necessarily perpendicular to the ribs 104, 105: for example, in the accompanying figures each hinge 100 comprises two grooves 109.

[0045] Each groove 109 preserves the integrity of the hinge 100 and in particular of the ribs 104, 105; during the relative rotation of the half-shells 2, 3, the sharp edge offered by the perimeter flaps 3a, 3b slides on the groove 109 and does not affect the bottom of the ribs 104, 105 (or in any case the ribs 104, 105), averting the danger of damage and / or progressive wear.

[0046] Favorably, in at least one intermediate angular configuration (Figures 19-22) for stabilization, and by virtue of an appropriate sizing of the components involved, the first rib 104 is interposed between the flaps 3a, 3b, to hinder at least partially the relative rotation.

[0047] That is to say, in practice, in the stabilization configuration, the double hindrance to closing rotation offered by the two ribs 104, 105 (and the hindrance to opening offered by the stroke limiter) is absent, but in any case rotation in one direction or the other is still hindered by the two ribs 104, 105, which "trap" the first perimeter flap 3a (see in particular Figure 21). This allows to obtain an at least partial stabilization of the half-shells 2, 3 in an additional angular configuration, different from the second extreme angular configuration.

[0048] Advantageously, the hinge 100 can comprise means for selective uncoupling, configured to allow the mutual uncoupling of the members 101, 102 (and of the half-shells 2, 3) in at least one intermediate angular configuration, indeed for the uncoupling of the half-shells 2, 3. In the preferred (non-exclusive) solution, the intermediate angular configuration for uncoupling coincides with the intermediate configuration for stabilization described earlier (and shown in Figures 19-22).

[0049] In particular, in the preferred (non-exclusive) embodiment, the means comprise a protrusion 110 which protrudes from the first half-shell 2 (anchored in a cantilever manner to the first half-shell 2). By virtue of its location (when the members 101, 102 are coupled), during the relative rotation of the half-shells 2, 3 the protrusion 110 is free to slide along an (annular) groove 111, which is provided along the second member 102 and is adapted to contrast the extraction of the pivot 107 from the hole 108 (since it normally opposes the longitudinal translation, parallel to the axis of articulation A, of the protrusion 110). The groove 111 is placed in communication with a longitudinal slot 112, which (by conveniently sizing the components) is aligned with the protrusion 110 in the intermediate angular configuration for uncoupling, in order to allow extraction of the pivot 107 from the hole 108. By conveniently choosing the width of the slot 112 and the corresponding size of the protrusion 110, uncoupling can be made possible not only at a precise angle formed by the half-shells 2, 3 but for an entire angular range (between a minimum value and a maximum value).

[0050] In practice, the groove 111 is delimited on one side by the raised edge of the second member 102 and on the other by an expansion 113 of the lateral surface, which also delimits the slot 112.

[0051] Positively, the container 1 may comprise a locking system, which may be selectively activated to inhibit the means for selective uncoupling (for example, to avert the danger of accidental extraction of the pivot 107 when one is in the intermediate angular configuration for uncoupling).

[0052] In particular, in the embodiment of the accompanying figures (see in particular Figures 12, 13 and 14), the system comprises a seat 114 (preferably threaded), which is provided in the second member 102 and is in communication with the hole 108, and a grub screw 115 (preferably threaded), which can be inserted in the seat 114.

[0053] The seat 114 is preferably a radial channel which forms a female thread, which extends at right angles to the axis of articulation A and to the hole 108, leading to the latter.

[0054] The grub screw 115 enters the seat 114 with the possibility of selective movement (for example, by screwing and unscrewing) between at least one first arrangement, in which it is at least partially inserted in an annular groove 107a provided along the pivot 107, to hinder the extraction of the pivot 107 from the hole 108, and a second arrangement, in which it is spaced from the pivot 107, to allow the extraction of the latter from the hole 108. The pivot 107 can also comprise multiple grooves 107a at different longitudinal distances.

[0055] In practice, in other words, the user can push the grub screw 115 into the seat 114 to a greater or lesser depth, to produce or not an obstacle to the extraction of the pivot 107.

[0056] In any case, the system can be provided in another way, by resorting to threadless grub screws 115 or even other solutions, for example a plate provided with a contoured slot formed by two circular portions of different diameters that interpenetrate: in the larger-diameter circular portion, the pivot 107 can slide freely (and thus slide out of the hole 108), while in the other one (which can be aligned with the pivot 107 by moving the plate relative to the second member 102) it can accommodate only the portion of pivot 107 in which the annular groove 107a is provided, in order to prevent extraction.

[0057] In addition to the container 1 according to the invention, sold comprising one or more hinges 100 according to the invention, the hinge 100, sold even individually in anticipation of its fitting on a container 1 possibly acquired separately, constitutes the subject matter of the protection claimed herein.

[0058] In this context, the hinge 100 according to the invention comprises in practice all of the prerogatives shown so far.

[0059] In greater detail, the hinge 100 for transportable containers 1 comprises at least one first member 101, which can be anchored to a first half-shell 2 of the container 1, and a second member 102, which can be anchored to a second half-shell 3 of the transportable container 1 and is rotatably coupled to the first member 101, so as to produce the mutual articulation of the half-shells 2, 3 about an axis of articulation A (formed by the hinge 100), between a first extreme angular configuration and a second extreme angular configuration. In the first extreme angular configuration, the half-shells 2, 3 provide the closure of the inner compartment 7 of the container 1, while the second extreme angular configuration corresponds to the maximum opening of the container 1, for free access to the compartment 7.

[0060] According to the invention, the hinge 100 comprises a first longitudinal rib 104 and a second longitudinal rib 105, which protrude from the lateral surface of the first member 101 and are oriented parallel to the axis of articulation A.

[0061] At the second configuration, the first longitudinal rib 104 and the second longitudinal rib 105 are configured to interfere with the rotation stroke, about the axis of articulation A and toward the first configuration, of a first perimetric flap 3a and a second perimetric flap 3b of the second half-shell 3, respectively.

[0062] The operation of the container and of the hinge according to the invention has already been described; in any case, a brief summary is given hereinafter.

[0063] In per se known manners, the hinge(s) 100 ensure(s) the relative rotation of the half-shells 2, 3, between the first extreme angular configuration, for closing the compartment 7, and the second one, for maximum opening and free access to the compartment 7.

[0064] The ribs 104, 105 constitute a hindrance to relative rotation, in one direction or the other, and the user is called to an additional effort when, during rotation, the flaps 3a, 3b rest against the ribs 104, 105, which can be passed only by elastic forcing, for example.

[0065] In particular, when the container 1 is in the second extreme angular configuration, the rotation of the second half-shell 3 is prevented by the stroke limiter (in the direction for further opening) and by the ribs 104, 105 (in the closing direction), thus producing an effective immobilization of the half-shells 2, 3 in both directions, which can be overcome (in the direction for reclosing) only by a voluntary act of the user, who has to force indeed the resistance to rotation offered by the ribs 104, 105.

[0066] Precisely the choice of providing the hinge 100 with two unaligned ribs 104, 105 makes it possible to oppose two distinct obstacles to the rotation of two different perimetric flaps 3a, 3b of the second half-shell 3, and this ensures optimal resistance to rotation, even when the half-shells 2, 3 or in any case the components involved are made of lightweight or otherwise elastically deformable materials, i.e., such as to determine (with known solutions) a high risk of exceeding the mechanical constraints provided (and therefore of unwanted accidental rotation).

[0067] As shown, the selective uncoupling means give an additional interesting functionality to the hinge 100 and the container 1, allowing in fact the uncoupling of the half-shells 2, 3 at at least one relative angular position (the intermediate angular configuration for uncoupling).

[0068] The means for selective uncoupling can besides be effectively inhibited (temporarily) by means of the grub screw 115 or in any case by virtue of the locking system.

[0069] Moreover, the constructive simplicity of the hinge 100 is an assurance of reliable operation and allows to provide the invention at low cost.

[0070] The invention thus conceived is susceptible of numerous modifications and variations, all of which are within the scope of the appended claims; all the details may furthermore be replaced with other technically equivalent elements.

[0071] In the embodiments shown, individual characteristics, given in relation to specific examples, may actually be interchanged with other different characteristics that exist in other embodiments.

[0072] In practice, the materials used, as well as the dimensions, may be any according to the requirements and the state of the art.

[0073] The disclosures in Italian Patent Application No. 102024000001131 from which this application claims priority are incorporated herein by reference.

[0074] Where technical features mentioned in any claim are followed by reference signs, those reference signs have been included for the sole purpose of increasing the intelligibility of the claims and accordingly, such reference signs do not have any limiting effect on the interpretation of each element identified by way of example by such reference signs.

Claims

1. A transportable container comprising at least one first half-shell (2), a second half-shell (3) and a hinge (100) provided with at least one first member (101), anchored to said first half-shell (2), and a second member (102), anchored to said second half-shell (3) and rotatably coupled to said first member (101), for the mutual articulation of said half-shells (2, 3) between a first extreme angular configuration, for closing an inner compartment (7), and a second extreme angular configuration, for maximum opening and free access to said compartment (7), characterized in that said first member (101) comprises a first longitudinal rib (104) and a second longitudinal rib (105), said longitudinal ribs (104, 105) protruding from the lateral surface of said first member (101) and being oriented parallel to the axis of articulation (A) formed by said hinge (100), at said second extreme configuration said first longitudinal rib (104) and said second longitudinal rib (105) being arranged so as to interfere with the rotational travel, about said axis of articulation (A) and toward said first configuration, of a first perimeter flap (3a) and a second perimeter flap (3b), respectively, of said second half-shell (3).

2. The transportable container according to claim 1, characterized in that said first member (101) comprises a block (106) which is anchored to said first half-shell (2) and a pivot (107), which extends from said block (106) and is inserted rotatably in a hole (108) provided in said second member (102), for the mutual articulation of said half-shells (2, 3) with respect to said axis of articulation (A), which coincides with the axis of longitudinal symmetry of said pivot (107), said ribs (104, 105) being provided along the lateral surface of said block (106).

3. The transportable container according to claim 1 or 2, characterized in that said perimeter flaps (3a, 3b) are constituted by respective edges of a contoured protrusion (8), which protrudes from an edge of said second half-shell (3).

4. The transportable container according to one or more of the preceding claims, characterized in that said ribs (104, 105) are connected by at least one groove (109), which protrudes transversely from said lateral surface of said first member (101).

5. The transportable container according to one or more of the preceding claims, characterized in that in at least one intermediate, stabilizing angular configuration, said first rib (104) is interposed between said flaps (3a, 3b), in order to hinder relative rotation at least partially.

6. The transportable container according to one or more of the preceding claims, characterized in that said hinge (100) comprises means for selective uncoupling, configured for clearance to the mutual uncoupling of said members (101, 102) in at least one intermediate angular configuration, for the uncoupling of said half-shells (2, 3), which preferably coincides with said intermediate stabilization configuration.

7. The transportable container according to claim 6, characterized in that said means comprise a protrusion (110) which protrudes from said first half-shell (2) and is free to slide, during the relative rotation of said half-shells (2, 3), along a groove (111) provided along said second member (102) and adapted to contrast the extraction of said pivot (107) from said hole (108), said groove (111) being placed in communication with a longitudinal slot (112), which is aligned with said protrusion (110) in said intermediate angular uncoupling configuration, in order to allow the extraction of said pivot (107) from said hole (108).

8. The transportable container according to claim 6 or 7, characterized in that it comprises a locking system, which can be activated selectively to inhibit said selective uncoupling means.

9. The transportable container according to claim 8, characterized in that said system comprises a seat (114), obtained in said second member (102) and placed in communication with said hole (108), and a grub screw (115), which can be inserted in said seat (114) with the possibility of selective movement between at least one first arrangement, in which it is at least partially inserted in an annular groove (107a) provided along said pivot (107), for hindering the extraction of said pivot (107) from said hole (108), and a second arrangement, in which it is spaced from said pivot (107), in order to allow the removal of said pivot (107) from said hole (108).

10. A hinge for transportable containers (1), comprising at least one first member (101), which can be anchored to a first half-shell (2) of a transportable container (1), and a second member (102), which can be anchored to a second half-shell (3) of the transportable container (1) and is rotatably coupled to said first member (101), for the mutual articulation of the half-shells (2, 3) about an axis of articulation (A), between a first extreme angular configuration, for closing an inner compartment (7) of the container (1), and a second extreme angular configuration, for maximum opening and free access to the compartment (7), characterized in that it comprises a first longitudinal rib (104) and a second longitudinal rib (105), which protrude from the lateral surface of said first member (101) and are oriented parallel to said axis of articulation (A), at said second configuration said first longitudinal rib (104) and said second longitudinal rib (105) being configured to interfere with the rotational travel, about said axis of articulation (A) and toward said first configuration, of a first perimetric flap (3a) and a second perimetric flap (3b) of the second half-shell (3), respectively.

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