METHOD FOR MANUFACTURED A MUSICAL OBJECT AND THE RESULTING MUSICAL OBJECT

Description

Technical field:

[0001] The present invention relates to a method for manufacturing a musical object, said musical object comprising a hollow and compressible body, made of a flexible and elastic material, delimiting an internal cavity, an internal wall disposed inside said body to divide said internal cavity into two chambers, and a musical insert mounted through said internal wall to connect said chambers and arranged to emit a sound when it is crossed by a flow of air, said flow of air being generated by a mechanical pressure exerted on said body at the right of one of the chambers, method in which the body of said musical object is made according to a molding technique in elastomer material shaped in a hollow manufacturing mold provided with a vent, the internal volume of said mold corresponding to the three-dimensional impression of said body.

[0002] The invention also relates to a musical object obtained according to the manufacturing process mentioned above. Technical previous:

[0003] The musical objects to which the invention applies include, but are not limited to, small wind instruments such as whistles used for music, games, rescue, signaling, and alerting, as well as toys for children and infants, pet toys, and any other squeaky or whistling object that emits a sound when compressed and / or chewed. These objects are traditionally made by molding from an elastic material, such as natural or synthetic rubber, or any other technically equivalent material, that is, one with elastic properties that allow the object to return to its original shape after the compression is removed. Furthermore, depending on the intended use of the object, the material used must meet strict health standards for non-toxicity, particularly in contact with a child's saliva.In this case, natural materials such as latex will be preferred, although this example is not exhaustive.

[0004] The musical insert typically includes a small beveled, reed, or vibrating wind instrument, or a combination of both, arranged to produce a sound by constriction or vibration as a pressurized airflow passes over it, caused either by blowing from the mouth or by air being forced out of the object's internal volume when the toy's body is compressed by mechanical pressure.

[0005] The musical insert also includes a music sleeve, which can be injection-molded from a material identical or similar to that of the object, allowing both the insertion and operation of the musical insert within the object. Generally, the musical insert contained in these objects is added after the object's manufacture during a manual finishing step and is introduced through a vent hole formed in a wall of the object's body during the molding stage. Thus, the musical insert is mounted in this vent hole in such a way that it communicates, on one hand, with the object's internal volume and, on the other hand, with the object's external environment, creating a gas exchange between these two environments when the user applies pressure to the object's body to compress it and releases the pressure so that the object returns to its original shape.At each activation of said object, the musical insert emits a sound as the airflow passes in one direction from the inside of the object to the outside when the object is under compression and / or in the other direction from the outside of the object to the inside when the activation on said object is removed.

[0006] The operation of these musical instruments inherently involves a risk of contamination of the instrument itself, and consequently of the user, by external contaminants that may originate from the user or the surrounding environment. It is therefore complicated, if not impossible, to properly clean and disinfect the musical instrument to prevent any cross-contamination.

[0007] Publications FR 2 793 152 A1, WO 2012 / 158742 A1 and WO 2017 / 045166 A1 describe respectively a whistle usable without the mouth, a whistle integrated into a toy, and a waterproof whistle, each of which necessarily requires an opening to the outside environment.

[0008] Publications EP 2 446 737 A2, EP 2 446 738 A2 and US 2012 / 0067294 A1 describe an animal toy comprising, among other things, a squeaky element that also communicates with the outside environment via an opening, but arranged in such a way that the animal cannot access and damage it.

[0009] Finally, US publication 2012 / 270467 A1 proposes a musical toy designed for child safety, in which the musical element is mounted in a holder, which is then glued to the toy's body through a hole in the toy's body. One of the schematically illustrated variants is particularly safe, as it prevents accidental access to the musical element. It features a closed body, inside which a musical element is mounted on an internal partition. This partition divides the inner chamber into two cavities, and allows sound to be produced by pressing the toy's body against one of the cavities. This solution could thus avoid the aforementioned contamination risks, but its industrial production is not described.

[0010] Therefore, there is currently no industrially feasible solution that avoids the aforementioned risk of contamination while meeting child safety requirements. Description of the invention:

[0011] The present invention aims to overcome these drawbacks by proposing a so-called "clean" musical object which avoids any risk of contamination of said object by external contaminants which may come from the user as well as from the ambient air and therefore any risk of cross-contamination when said musical object is exchanged between several users, to simplify the cleaning and disinfection of said object by allowing cleaning by immersion, or by simple contact with a washing solution, and to significantly simplify the industrial process for the manufacture of said object.

[0012] To this end, the invention relates to a manufacturing method of the kind indicated in the preamble, characterized in that said inner wall, provided with a through-hole arranged to receive and hold said musical insert in position, is manufactured separately; in that, prior to the molding stage of said body, said inner wall is added to said manufacturing mold in such a way that its perimeter is overmolded by said body during the molding stage; in that, after the molding operation of said body, said musical insert is introduced into said body through the vent hole left in the outer wall of said body by the vent of said manufacturing mold, to fit it into the inner wall through said through-hole and simultaneously hermetically seal said through-hole; and in that, after mounting the musical insert in said body,The vent hole is closed with a plug to seal it airtight and hermetically seal the internal cavity, so that the musical insert is placed inside the body, between the two chambers, communicating only with them, without any communication with the external environment of the musical object.

[0013] Preferably, the said inner cavity is filled with a determined and constant total volume of air, taking into account the elasticity of the said material constituting the said body and the three-dimensional shape of the said body, to allow a movement of air between the two chambers when a mechanical pressure is exerted on the said body at the right of one of the chambers and thus allow the creation of a sound at each mechanical stress of the said object.

[0014] In a preferred embodiment of the invention, a rotomolding technique is used as the molding technique.

[0015] Preferably, for the inner wall and the body of said musical object, a similar, identical or compatible elastomeric material is used, allowing fusion between the two materials during the molding operation, this elastomeric material being able to be chosen from natural rubbers, synthetic rubbers, thermoplastic elastomers.

[0016] Advantageously, the musical insert is provided with a mounting area complementary to the through-hole provided in the inner wall and arranged to hermetically seal the through-hole. In particular, the mounting area may be made in the form of a groove arranged to receive the through-hole, and two lips arranged on either side of the groove, arranged to press against opposite faces of the inner wall, hold the musical insert in the mounting position relative to the inner wall, and hermetically seal the through-hole.

[0017] For this purpose also, the invention relates to a musical object of the kind indicated in the preamble, characterized in that said inner wall has its perimeter overmolded by said body and includes a through orifice arranged to receive and hold in position said musical insert, in that said musical insert is arranged to hermetically close said through orifice, and in that said body includes a vent hole hermetically closed by a plug so that said musical insert is disposed inside said body, between the two chambers so as to communicate only with them, without any communication with the external environment of said musical object.

[0018] In an advantageous embodiment of the invention, said inner cavity is filled with a determined and constant total volume of air, taking into account the elasticity of said material constituting said body and the three-dimensional shape of said body, to allow a displacement of air between the two chambers when mechanical pressure is exerted on said body at the right of one of the chambers and thus allow the creation of a sound at each mechanical stress of said object.

[0019] In the preferred embodiment of the invention, said musical insert comprises a mounting area complementary to the through-hole provided in said inner wall and arranged to hermetically seal said hole.

[0020] The said mounting area may include a groove arranged to receive the said through-hole, and two lips arranged on either side of the said groove and arranged to press against the opposite faces of the said inner wall, to hold the said musical insert in the mounting position relative to the said inner wall and to hermetically seal the said through-hole. Brief description of drawings:

[0021] The present invention and its advantages will become more apparent from the following description of an embodiment given by way of non-limiting example, with reference to the accompanying drawings, in which: there figure 1 is an exploded view of an object according to the invention in a first manufacturing stage, showing the insertion of an inner wall into a hollow body of said object during a molding operation, the figure 2 is an exploded view of the object of the figure 1a second manufacturing stage, showing the assembly of a musical insert into the body of the object obtained by molding, the figure 3 is an axial cross-sectional view of the object of the figure 2 , there figure 4 is an exploded view of the object of the figure 2 in a third manufacturing stage, showing the fitting of a cap to hermetically seal the body of said object, the figure 5 is an axial cross-sectional view of the musical object according to the invention obtained after manufacture, showing the stopper assembled to the body of said object and the volume of air contained in said body, the figure 6 is a cross-sectional view along the VI-VI axis through the partition wall of the musical object of the figure 5 , and the figure 7 is a view similar to the figure 5 showing said musical object in operation, one part of the body of said musical object being compressed and in depression and the other part being expanded and in overpressure. Illustrations of the invention and the best way to implement it:

[0022] With reference to the figures, the invention relates to a musical object 10 which can have several uses, such as those listed in the prior art description, without this list being exhaustive. The musical object 10 is illustrated in the figures in a simplified parallelepiped shape, but can of course have any other three-dimensional shape, geometric or otherwise, fanciful or otherwise, representing a figurine or not, this shape being defined and chosen according to the intended use of said object. The musical object 10 in all cases comprises a hollow and compressible body 11, delimiting at least one closed internal cavity 12.The body 11 of said musical object 10 is advantageously made of an elastomeric material, such as natural or synthetic rubber, or any other technically equivalent material, that is to say, one having elastic properties allowing the object to return to its original shape after the removal of compressive stress. It is preferably manufactured in one piece and has a continuous outer wall 14, obtained by molding as explained below. Of course, depending on the complexity of the three-dimensional shape of said object, it may be manufactured in two or more pieces assembled along one or more joint planes screwed, welded, glued, or assembled by any other known technical means, to be detachable or non-detachable, according to the specifications of said object.

[0023] The musical object 10 advantageously comprises an inner wall 15 which divides the inner cavity 12 into two airtight chambers 12a, 12b and supports a musical insert 20. This insert is positioned inside the body 11, between the two chambers 12a, 12b, so that it communicates only with them, without any communication with the external environment of the object. The inner wall 15 is preferably positioned in a central area of ​​the musical object 10 to divide the inner cavity 12 into two chambers 12a, 12b of substantially equal volume. This embodiment is preferred but not the only one, as the two chambers could have different volumes without affecting the operation of the musical insert 20. In this case, the chamber with the smaller volume must have sufficient volume to allow adequate airflow for the musical insert 20 to emit a sound.Conversely, if the volume of the smaller chamber is insufficient, the air movement will not be able to generate sound. Indeed, the volume of these chambers 12a and 12b defines the airflow that will pass through the musical insert 20 to create a sound each time the object is activated. To do this, the total air volume of the two chambers 12a, 12b of the musical object 10 in the initial state, i.e. without mechanical stress, must be determined according to the elasticity allowed by the material constituting the body 11 of said object and the three-dimensional shape of said musical object 10. This means that the chambers 12a, 12b must not be put under overpressure in the initial state of said musical object 10, because if the total air volume is too large to the point of saturating the chambers, there will be no possibility of air movement between the two chambers 12a, 12b and consequently no sound creation.Similarly, chambers 12a, 12b should not be placed under negative pressure in the initial state of said musical object 10, because too small a total air volume will prevent any movement of air between the two chambers and any creation of sound.

[0024] The inner wall 15 further includes a through-hole 16 for receiving and holding in position the musical insert 20. During installation, the through-hole 16 must be hermetically sealed, so that the airflow F passes from one chamber to the other exclusively through the musical insert 20, guaranteeing optimal operation. In the example shown, this through-hole 16 is positioned in the center of the inner wall 15, allowing the musical insert 20 to be centered relative to the body 11, although this position is not mandatory. Naturally, the position of the inner wall 15, the number of inner walls 15, the position of the musical insert 20, and the number of musical inserts 20 can vary depending on the size, shape, and intended use of the musical object 10.It is entirely possible to juxtapose several musical objects 10, each equipped with a different musical insert 20, in a single device to create several tones of sound depending on the area activated. The inner wall 15 can be made of a material identical to, or at least chemically compatible with, the material of the body 11. It can be manufactured separately and then inserted into the mold for manufacturing the body 11, forming a single piece with the body 11 after molding. Of course, if the body 11 of the musical object 10 is manufactured in two or more pieces assembled along one or more parting lines, the inner wall 15 can be integrated into a parting line between two pieces.

[0025] The musical insert 20 is designed to be housed inside the inner cavity 12 of the body 11 and secured to the inner wall 15 of said object without communicating with the external environment. The inner cavity 12 of said body 11 is therefore hermetically sealed and contains a defined and constant volume of air. This volume of air remains clean and free of contaminants because it is never in contact with the external environment during the use of the musical object 10. Consequently, the musical insert 20 also remains clean because it is confined within a hermetically sealed volume; it is therefore never polluted by contaminants or soiled by dust, and its operation is never impaired. The result of this design is a musical object 10 offering excellent safety for the user, since the musical element 20 is never accessible, even accidentally.

[0026] The musical insert 20 is arranged to emit a sound when it is traversed by an airflow F obtained as soon as the body 11 of said musical object 10 is deformed by mechanical pressure at the right-hand side of one of the chambers 12a, 12b and the volume of air contained in this chamber 12a, 12b on one side of the inner wall 15 is forced towards the other chamber 12b, 12a on the other side of the inner wall 15 by way of the musical insert 20 ( Fig. 7To this end, the body 11 is advantageously made of a flexible and elastic material, giving the musical object 10 great flexibility, allowing it to be easily deformed by compression and expansion generating the movement of an airflow F from one chamber 12a, 12b to the other solely through the musical insert 20, while also having the ability to quickly and automatically return to its initial shape as soon as it is no longer under stress. The musical insert 20 generally makes it possible to create a sound in both directions of movement of the airflow F.

[0027] Musical insert 20, illustrated from the figure 2The musical insert 21 may consist of any type of commercially available musical insert, or may be specially designed for the present invention. It comprises a hollow musical sleeve 21 forming an air duct 22 open at both ends by an orifice 23 allowing the circulation of an airflow F through the sleeve. A musical element 30 is mounted inside the air duct 22 to be traversed by said airflow F and to emit a sound when the body 11 of said musical object 10 is deformed and compressed at one of the chambers 12a, 12b. Of course, the musical element 30 and the musical sleeve 21 may form a single piece, or two separate pieces assembled together in a locked mounting position.

[0028] The musical insert 20 has a mounting area 25, which may be central or not, allowing both its axial insertion into the through-hole 16 of the inner wall 15, its axial locking in both directions relative to this wall, and the sealing of said through-hole 16. This mounting area 25 has, for this purpose, a groove 26 adapted to receive the thickness of said inner wall 15, and two lips 27 arranged on either side of said groove 26 to, on the one hand, lock the axial position of the musical insert 20 in both directions relative to the inner wall 15, and on the other hand, ensure the airtightness of this assembly. In the example shown, the music sleeve 21 is cylindrical and the mounting area 25 is annular. Thus, the inner diameter of the groove 26 must be substantially equal to, or even slightly larger than, the diameter of the through-hole 16 to ensure a tight fit.Similarly, the width of the groove 26 must be substantially equal to, or even slightly less than, the thickness of the inner wall 15 to press the lips 27 against the two opposite faces of said wall. Furthermore, the outer diameter of the lips 27 must be greater than the diameter of the through-hole 16 to contribute to the airtightness of this assembly. Of course, any other equivalent technical means may be suitable. Likewise, the cylindrical shape of the music sleeve 21 and the annular shape of the mounting area 25 are not limiting and may differ while still fulfilling the intended functions.

[0029] The musical element 30 contained within the musical insert 20 belongs to the category of small wind instruments. In the illustrated example, it consists of a double-entry whistle, in which the sound is created by the vibration of a reed as airflow F passes through it, flowing in opposite directions depending on whether one or the other chamber 12a, 12b is compressed. It is one of the known elements and will not be described in further detail. It can be made of wood, reed, metal, synthetic material such as a thermoplastic, composite material, or a combination of at least two of these materials. Of course, any other shape and / or design of a musical element may be suitable. Application possibilities industrial:

[0030] The manufacturing process for the musical object 10 according to the invention comprises a molding operation of the object's body 11 in a hollow mold (not shown), the inner surface of which corresponds to the three-dimensional impression of said object. A rotomolding or rotational molding technique can be chosen, which allows for the production of hollow, one-piece parts without a parting line, by shaping molten plastic against the inner wall of a hollow mold. Alternatively, a two-piece injection molding technique can be used, with a step of bonding the two parts on a press along a parting line. A blow molding technique can also be used, if the plastic material used is suitable. In the present invention, an elastomer such as natural or synthetic rubber can be used as the principal plastic material, although this example is not limiting.The manufacturing mold is generally made in two parts, although this example is not exhaustive, and is equipped with one or more vents to ensure pressure balance inside the mold. A dose of plastic material is loaded into the mold before it is closed, determined according to the wall thickness of the object to be manufactured. The molding process includes a heating stage and a cooling stage. The vent allows the gases contained in the mold to escape during the heating stage, and then allows air to enter the mold during the cooling stage, thus preventing the part from being under negative pressure.

[0031] Prior to the molding stage of the body 11 of said object, the inner wall 15, which has been manufactured separately, is added inside the mold, for example between the two parts of the mold. In this case, it may be provided that the vent provided in the mold extends into the through-hole 16 of the inner wall 15 to prevent this hole from becoming blocked by the molten plastic. Thus, at the end of the molding phase, and after opening the mold, the body 11 of said object is obtained, according to the figure 1 incorporating the inner wall 15, the perimeter of which is intimately bonded to the outer wall 14 of the body 11 by fusion between the two materials during the molding operation. This is why the inner wall 15 and the body 11 of said object are made of a similar, identical, or compatible elastomer material.

[0032] After the maturation or complete drying phase of said body 11, the musical insert 20 is introduced inside the body 11 through the vent hole 13 left in the outer wall 14 of said body 11 by the vent of the manufacturing mold, as shown in the figures 2 and 3 Since the material forming the body 11 is flexible and elastic, the musical insert 20 can pass through the vent hole 13, which opens as the music sleeve 21 and the lips 27 pass through it. The musical insert 20 is guided inside the body 11 to be fitted into the inner wall 15 through the through-hole 16. The material forming the inner wall 15 and / or the music sleeve 21 allows the through-hole 16 and / or the lips 27 to deform as the music sleeve 21 and one of the lips 27 pass through it. After the musical insert 20 is mounted in the body 11, as shown in the figure 4A plug 17 is inserted into the vent hole 13 to seal it airtight. In the illustrated example, this plug 17 is shouldered and secured to the wall 14 by bonding or any other equivalent method, ensuring a hermetic seal of the internal cavity 12. Similarly, any other type of plug that performs the same function may be suitable, such as an elastomeric or latex seal created by the accumulation of material in the vent hole 13, an elastomeric pellet placed over the vent hole 13 and sealed with latex, etc. Therefore, the term "plug" should not be interpreted restrictively.

[0033] The musical object 10 obtained by the manufacturing process according to the invention is illustrated in the figures 5 to 7 It constitutes an object completely airtight, containing in its internal cavity 12 a determined and constant volume of air (symbolized at the figure 5by an equal point density between the two chambers). This volume of air may be at atmospheric pressure or at a pressure slightly higher or lower than atmospheric pressure, determined empirically based on the elasticity of the material constituting said body 11 and the three-dimensional shape of said body 11. In the illustrated example, this volume of air is divided into two substantially equal parts in the two chambers 12a, 12b, which are hermetically sealed from each other by the inner wall 15, through which said musical insert 20 is positioned. As mentioned above, the two chambers 12a, 12b may not have the same volume. The balanced position of the musical object 10 is shown in the figure 5, a position in which the object emits no sound. This balanced position corresponds to the initial state of said musical object 10, that is, when it is not subjected to any mechanical stress. To create a sound, it is necessary to exert mechanical pressure on the body 11 of said musical object 10 at one of the chambers 12b, represented by the arrows P in the figure 7 which will expel some of the air volume from chamber 12b into the other chamber 12a, in order to create an airflow F in one direction through the musical insert 20, generating a sound. The volume of air expelled from one of the chambers 12b will put that chamber 12b under negative pressure (symbolized by a point density greater than the density of the equilibrium position of the figure 5 ) and the other chamber 12a under overpressure (symbolized by a point density lower than the density of the equilibrium position of the figure 5), thereby increasing the air volume and causing the expansion of body 11 opposite this other chamber 12a, represented by arrows E. This unbalanced position is illustrated in the figure 7 Conversely, mechanical pressure (not shown) exerted on the body 11 opposite the other chamber 12a forces some of the air volume from chamber 12a into the other chamber 12b, creating an airflow F in the opposite direction through the musical insert 20, which also generates a sound. The cessation of compression on the musical object 10 results in an automatic rebalancing of the pressures between the two chambers 12a and 12b via the musical insert 20, which may or may not generate a sound depending on its sensitivity. The musical object 10 automatically returns to its balanced position or to its initial state ( Fig. 5 ) and no longer emits any sound.

[0034] It is clear from the foregoing that the invention makes it possible to achieve the stated objectives. In particular, this musical object 10 can emit sounds without communicating with the external environment, through a simple transfer of air between two hermetically sealed chambers 12a, 12b via a musical insert 20. Therefore, this musical object 10 is considered "clean" since its internal volume and its musical insert 20 are protected from the user and the external environment by its hermetically sealed body 11, thus preventing any risk of contamination. Furthermore, it can be easily washed, cleaned, and disinfected to again prevent any risk of contamination through touch.This musical object 10 can be used in all kinds of applications, from emergency services as a sound alert, to sports as a means of refereeing, to leisure as a musical instrument, to play as a squeaky or whistling toy for children and pets, etc. Its unique design makes this musical object 10 a completely safe device for the user, since the musical insert 20 is not accessible, even accidentally.

[0035] The present invention is not limited to the exemplary embodiment described but extends to any modification and variant obvious to a person skilled in the art within the scope of protection as defined by the following claims.

Claims

1. Method for producing a musical instrument (10), said musical instrument comprising a hollow and compressible body (11) made of a flexible and elastic material, delimiting an internal cavity (12), an internal wall (15) arranged inside said body (11) in order to divide said internal cavity (12) into two chambers (12a, 12b), and a musical insert (20) mounted through said internal wall (15) in order to place said chambers (12a, 12b) in communication with one another and designed to emit a sound when passed through by an air flow (F), said air flow being generated by a mechanical pressure exerted on said body (11) at the level of one of the chambers, in which method the body (11) of said musical instrument (10) is made, using a moulding technique, from an elastomer material shaped in a hollow production mould provided with a vent, the internal volume of said mould corresponding to the three-dimensional impression of said body (11), characterised in that said internal wall (15) provided with a through-orifice (16) designed to receive and hold said musical insert (20) in position is produced separately, in that, prior to the step of moulding said body (11), said internal wall (15) is added into said production mould such that the periphery thereof is overmoulded by said body (11) during the moulding step, in that, after the moulding operation for said body (11), said musical insert (20) is inserted into said body (11) via the vent hole (13) left in the external wall (14) of said body (11) by the vent of said production mould, in order to interlock same in the internal wall (15) through said through-orifice (16) and simultaneously hermetically seal said through-orifice, and in that, after mounting the musical insert (20) inside said body (11), said vent hole (13) is closed by a plug (17) in order to sealingly plug and hermetically seal said internal cavity (12), such that said musical insert (20) is arranged inside said body (11), between the two chambers (12a, 12b) so as to communicate solely therewith, without any communication with the environment external to said musical instrument (10).

2. Production method according to claim 1, characterised in that said internal cavity (12) is filled with a determined and constant total air volume taking into account the elasticity of said material forming said body (11) and the three-dimensional shape of said body (11) in order to allow air to be displaced between the two chambers (12a, 12b) when a mechanical pressure is exerted on said body (11) at the level of one of the chambers and thus allow a sound to be created each time said instrument is mechanically stressed.

3. Production method according to claim 1, characterised in that the internal wall (15) and the body (11) of said musical instrument (10) are made of a similar, identical, or compatible elastomer material, allowing the two materials to fuse during the moulding operation.

4. Production method according to claim 3, characterised in that said elastomer material is chosen from natural rubbers, synthetic rubbers, and thermoplastic elastomers.

5. Production method according to claim 1, characterised in that said moulding technique is a rotational moulding technique.

6. Production method according to claim 1, characterised in that a mounting area (25) complementary to the through-orifice (16) provided in said internal wall (15) is provided on said musical insert (20) and designed to hermetically seal said through-orifice (16).

7. Production method according to claim 6, characterised in that said mounting area (25) is produced in the form of a groove (26) designed to receive said through-orifice (16), and two lips (27) arranged on either side of said groove (26) and designed to be pressed against the opposite faces of said internal wall (15), to hold said musical insert (20) in the mounting position relative to said internal wall (15) and to hermetically seal said through-orifice (16).

8. Musical instrument (10) obtained by the production method according to any of the preceding claims, said musical instrument comprising a hollow and compressible body (11) made of a flexible and elastic material, delimiting an internal cavity (12), an internal wall (15) arranged inside said body (11) in order to divide said internal cavity (12) into two chambers (12a, 12b), and a musical insert (20) mounted through said internal wall (15) in order to place said chambers (12a, 12b) in communication with one another and designed to emit a sound when passed through by an air flow (F), said air flow being generated by a mechanical pressure exerted on said body (11) at the level of one of the chambers, characterised in that said internal wall (15) has its periphery overmoulded by said body (11) and comprises a through-orifice (16) designed to receive and hold said musical insert (20) in position, in that said musical insert (20) is designed to hermetically seal said through-orifice (16), and in that said body (11) comprises a vent hole (13) that is hermetically sealed by a plug (17) such that said musical insert (20) is arranged inside said body (11), between the two chambers (12a, 12b) so as to communicate solely therewith, without any communication with the environment external to said musical instrument (10).

9. Musical instrument according to claim 8, characterised in that said internal cavity (12) is filled with a determined and constant total air volume taking into account the elasticity of said material forming said body (11) and the three-dimensional shape of said body (11) in order to allow air to be displaced between the two chambers (12a, 12b) when a mechanical pressure is exerted on said body (11) at the level of one of the chambers and thus allow a sound to be created each time said instrument is mechanically stressed.

10. Musical instrument according to claim 8, characterised in that said musical insert (20) comprises a mounting area (25) complementary to the through-orifice (16) provided in said internal wall (15) and designed to hermetically seal said orifice.

11. Musical instrument according to claim 10, characterised in that said mounting area (25) comprises a groove (26) designed to receive said through-orifice (16), and two lips (27) arranged on either side of said groove (26) and designed to be pressed against the opposite faces of said internal wall (15), to hold said musical insert (20) in the mounting position relative to said internal wall (15) and to hermetically seal said through-orifice (16).