CH714808A2 - Ring ring for maintaining a rotating bezel system. - Google Patents

Abstract

The invention relates to an annular ring (16) for holding a rotating bezel system (6) intended to cooperate with a cylindrical outer surface (8) of a middle part (4) of a watch case (2). ) to allow rotation of the rotating bezel (14) on the middle part (4), the annular ring (16) comprising means (26) for rotating the rotating bezel (14) around the middle part (4). According to the invention the annular ring (16) further comprises means (28) configured to slow the rotation of the rotating bezel (14) around the middle part (4) and to dampen the sound.

Description

Description

TECHNICAL FIELD OF THE INVENTION The invention relates to an annular ring for holding a rotating bezel system.

The invention also relates to an annular rotating bezel system comprising the retaining ring.

The invention also relates to a watch case comprising a middle part and the annular rotating bezel system mounted for rotation on the middle part.

The invention further relates to a watch comprising the watch case. The watch is for example a diving watch, without this being limiting in the context of the present invention

STATE OF THE ART [0005] Known annular rotating spectacle systems are provided with an annular ring for holding the system, intended to cooperate with a cylindrical outer surface of a watch case middle to allow rotation of the rotating bezel on the middle. Such an annular ring for holding a rotating bezel system is for example described in patent document EP 2 672 333 A1. The annular ring is a flat ring provided with an internal rim comprising a peripheral projection. The peripheral projection cooperates with an annular projection of an outer wall of the middle part to vertically hold the rotating bezel system on the middle part, and serves as a means of guiding the rotating bezel in rotation around the middle part. However, in such a rotating bezel system, the annular ring does not provide good braking torque between the rotating bezel and the outer wall of the middle part. In addition, during the rotation of the rotating bezel around the middle, the meshing of the various elements of the system produces an unpleasant noise for a user, detrimental to the qualitative feeling of the quality of the equipped watch that the user can have.

SUMMARY OF THE INVENTION The object of the invention is therefore to provide an annular ring for holding a rotating bezel making it possible to guarantee good braking torque between the rotating bezel and the outer wall of the middle part and to control the noise produced during rotation of the bezel, while retaining good rotational guidance of the rotating bezel around the middle.

To this end, the invention relates to an annular ring for holding a rotating bezel system which comprises the characteristics mentioned in independent claim 1.

Particular forms of the ring are defined in dependent claims 2 to 13.

A first advantage of the present invention is to provide good braking torque between the rotating bezel and the outer wall of the middle part. Indeed, thanks to the presence of the means configured to slow down the rotation of the rotating bezel around the middle and to dampen the sound, the different games inside the rotating bezel system are smoothed, so that the user of the bezel does not feel them. The rotation torque of the telescope is also controlled, making it softer and the telescope more pleasant to handle. In addition, the noise produced by the rotation of the bezel is damped and gives the user a quality impression of the bezel system and more generally of the watch equipped with this system.

In addition, the annular ring keeps the spring means and the toothed ring in the rotating bezel, thereby promoting the mounting of the rotating bezel on the middle.

According to a first embodiment of the invention, the annular ring comprises on a periphery an alternation between the tongues of a first group of tongues and the tongues of a second group of tongues, the tongues of the first group and the tongues of the second group having dimensions, in the radial direction, differentiated, the tongues of one of the first and second groups of tongues forming said means for guiding in rotation, the tongues of the other of the first and second groups of tongues forming said braking and sound damping means. An advantage of this first embodiment is that it limits the passage of dirt inside the rotating bezel system, thanks to the presence of the different tabs which block such dirt.

Advantageously, according to this first embodiment, the tongues of the first group have dimensions in the radial direction smaller than those of the tongues of the second group, the tongues of the first group forming said means for guiding in rotation, the tongues of the second group being made up of segments which are more flexible than the tongues of the first group, said segments being able to flex axially and forming said braking and sound damping means. Thanks to the axial flexibility of the tongues of the second group, these can ensure braking of the rotation of the rotating bezel around the middle by friction against the cylindrical outer surface, as well as damping of the product sound.

Advantageously also, according to this first embodiment, the tongues of the first and second groups are separated from each other by notches. This allows in particular to improve the flexibility of the tabs of the second group of tabs.

CH 714 808 A2 Advantageously also, according to this first embodiment, the first and second groups of tabs each comprise six tabs, the tabs of the first and second groups being distributed over 360 °, the tabs of the same group of tabs being spaced two by two by 60 °. This further improves braking and noise damping, in particular by further reducing the play inside the system and making the torque even smoother.

According to a second embodiment of the invention, the annular ring comprises on an inner or outer periphery a set of bosses, said bosses forming said braking and sound damping means. An advantage of this second embodiment is that the bosses act radially in a plane in which the ring extends, and not perpendicular to this plane like the tongues of the first embodiment. Thanks to the radial flexibility of the bosses, these can ensure braking of the rotation of the rotating bezel around the middle by friction against the middle or the bezel, as well as damping of the sound produced. In a first variant of this second embodiment, the bosses are arranged on an inner periphery of the ring to cooperate with a cylindrical outer surface of the middle part, the annular ring being intended to be secured to the rotating bezel. In a second variant of this second embodiment, the bosses are arranged on an outer periphery of the ring to cooperate with an inner surface of the rotating bezel, the annular ring being intended to be secured to the middle part.

Advantageously, according to this second embodiment, the annular ring comprises a set of oblong slots, each oblong slot being formed in the thickness of the annular ring opposite one of said bosses, the thickness being measured according to a axial direction perpendicular to a plane in which the ring extends. This gives each boss radial flexibility in the plane in which the ring extends.

Advantageously also, according to this second embodiment, the annular ring comprises six bosses distributed over 360 °, the bosses being spaced two by two by 60 °. This further improves braking and noise damping, in particular by further reducing the play inside the system and making the torque even smoother.

Advantageously, the annular ring is formed from a single piece of material consisting of a plastic material, in particular PTFE, ethylene-tetrafluoroethylene (Tefzel®), and polyoxymethylene (Delrin®) if necessary coated with a layer aimed at improving the coefficient of friction. This material has the advantage of having a good flexibility / rigidity compromise, allowing the tongues of the first group of tongues and the tongues of the second group of tongues to have the desired elastic and mechanical properties.

To this end, the invention also relates to an annular rotating bezel system comprising the annular retaining ring described above, and which comprises the characteristics mentioned in the dependent claim

14.

To this end, the invention also relates to a watch case comprising the annular rotating bezel system described above, and which comprises the characteristics mentioned in dependent claim 15.

Particular forms of the watch case are defined in dependent claims 16 and 17.

To this end, the invention also relates to a watch comprising the watch case described above, and which comprises the characteristics mentioned in dependent claim 18.

BRIEF DESCRIPTION OF THE FIGURES The purposes, advantages and characteristics of the retaining ring of a rotating bezel according to the invention will appear better in the following description on the basis of at least one non-limiting embodiment illustrated by the drawings in which:

fig. 1 is an exploded perspective view of an annular rotating bezel system comprising an annular ring according to a first embodiment of the invention;

fig. 2 is a top view of the annular rotating bezel system of FIG. 1, once assembled;

fig. 3 is a sectional view of the system of FIG. 2, taken along a sectional plane III-III;

fig. 4 is a top view of the annular ring of FIG. 1;

fig. 5a is a perspective view of an annular ring according to a second embodiment of the invention; and fig. 5b is an enlarged view of a detail of the embodiment of the annular ring of FIG. 5a.

CH 714 808 A2

DETAILED DESCRIPTION OF THE INVENTION [0024] FIG. 1 represents a watch 1 provided with a watch case 2. The watch case 2 typically comprises a middle part 4. The watch case 2 also comprises an annular rotating bezel system 6 as well as a watch movement which extends in a plan, the watch movement not being shown in the figures for reasons of clarity. The annular rotating bezel system 6 is mounted for rotation on the middle part 4. Preferably, as illustrated in FIGS. 1 to 3, the annular rotating bezel system 6 is formed by an independent module. The annular rotating bezel system 6 is for example clipped onto the middle part 4, as will be detailed later.

As illustrated in FIG. 1, the middle part 4 is of annular shape. The middle part 4 comprises a cylindrical outer surface 8. As can be seen in FIG. 3, the cylindrical outer surface 8 is provided with a peripheral shoulder defined by a side wall 12a and a base 12b. This peripheral shoulder serves as a housing for the rotating bezel system 6. The side wall 12a comprises an annular projection or bead 13 extending over the entire perimeter of the side wall 12a and allowing the spitting of the rotating bezel system 6 to the middle 4, by clipping. The annular rotating bezel system 6 is based on the base 12b. The rotating bezel system 6 is thus mounted on the middle part 4, from above the latter, allowing the system 6 to be blocked in an axial direction perpendicular to the plane of the watch movement, while allowing rotation of the bezel around the middle part 4. In the watch case 2 taken as an example in figs. 1 to 3, the configuration of the watch case is substantially circular. However, the invention is in no way limited to such a configuration of the watch case, nor to the other arrangements described above for the middle part. The middle part can be made of metal, typically steel, titanium, gold. , platinum or ceramic typically based on alumina, zirconia or silicon nitride.

The annular rotating bezel system 6 comprises a rotating bezel 14, an annular retaining ring 16, a toothed ring 18 and spring means 20. Preferably, the system 6 further comprises a decor ring 22 forcibly engaged on the rotating bezel 14. The decor ring 22 carries for example graduations, typically diving graduations in the case of a diving watch 1. The decor ring 22 is for example ceramic.

The rotating bezel 14 is of annular shape and includes an upper face 23a visible to the user and a lower face 23b. As illustrated in fig. 1 and 3, the rotating bezel 14 is for example provided on an inner periphery with an annular rim 24. The annular rim 24 cooperates by clipping with the protrusion 13 of the middle part 4, and forms with the latter a free spitting system . The rotating bezel 14 is for example made of metal but could be made of any other material, for example ceramic.

The annular ring 16 maintains the toothed ring 18 and the spring means 20 in the bezel 14, in an axial direction perpendicular to the plane of the watch movement. This makes it easier to mount the rotating bezel 14 on the middle part 4. Preferably, and as visible in FIG. 3, the annular ring 16 is driven into the rotating bezel 14, securing it to the latter. In an alternative embodiment not shown in the figures, the annular ring 16 is secured to the middle part 4.

The annular ring 16 rests on the base 12b of the middle part 4, and thus surrounds the cylindrical outer surface 8 of the middle part 4. The annular ring 16 is configured to cooperate with the cylindrical outer surface 8 to allow rotation of the rotating bezel 14 on the middle 4.

As illustrated in FIGS. 1,4 and 5a, the annular ring 16 according to the invention comprises means 26 for guiding the rotating bezel 14 in rotation around the middle part 4, and means 28 configured to slow down the rotation of the rotating bezel 14 around the middle 4 and to dampen the sound. The annular ring 16 is for example formed from a single piece of material made of a plastic material, in particular PTFE, ethylene-tetrafluoroethylene (Tefzel®), or polyoxymethylene (Delrin®) if necessary coated with a layer aimed at improving the coefficient of friction. The annular ring 16 is for example of generally rectangular section.

In a first embodiment shown in FIGS. 1 and 4, the annular ring 16 comprises on an inner periphery an alternation between tongues 30a of a first group of tongues, and tongues 30b of a second group of tongues. The tongues 30a of the first group and the tongues 30b of the second group are in contact with the cylindrical outer surface 8 of the middle part. Such tongues 30a, 30b limit the passage of dirt inside the rotating bezel system 6. In the variant not shown in the figures according to which the annular ring 16 is secured to the middle part 4, the tongues 30a of the first group and the tongues 30b of the second group are arranged on an outer periphery of the annular ring 16 and are in contact with a inner surface of the rotating bezel 14.

In the embodiment of FIGS. 1 and 4, the first and second groups of tabs each comprise six tabs 30a, 30b, distributed over the inner periphery of the ring 16 over 360 °. The tabs of the same group of tabs are thus spaced two by two by 60 °, the tabs 30a, 30b of the first and second groups of tabs being alternated.

The tabs 30a of the first group and the tabs 30b of the second group have dimensions, in the radial direction, differentiated. In the example of embodiment of fig. 1 and 4, the tongues 30a of the first group of tongues have dimensions in the radial direction smaller than those of the tongues 30b of the second group of tongues, and form the means for guiding in rotation 26. Thus, as shown in FIG. 4, the radial distance

CH 714 808 A2

D1 separating the tabs 30a from the first group of tabs from the center of the ring 16 is greater than the radial distance D2 separating the tabs 30b from the second group of tabs from the center of the ring 16.

The tongues 30b of the second group of tongues form the braking and damping means of the sound 28. More precisely, the tongues 30b of the second group of tongues are made up of softer segments than the tongues 30a of the first group. Such segments are capable of bending in an axial direction perpendicular to the plane of the watch movement. To do this, a particular embodiment shown in FIGS. 1 and 4 consists in that the tongues 30a of the first group and the tongues 30b of the second group have differentiated thicknesses, the thickness being measured in the axial direction perpendicular to the plane of the watch movement. Typically, the tabs 30b of the second group have a thickness less than that of the tabs 30a of the first group, thus giving them greater flexibility. Thanks to the axial flexibility of the tongues 30b of the second group, these can ensure braking of the rotation of the rotating bezel 14 around the middle part 4 by friction against the cylindrical outer surface 8, as well as damping of the sound produced.

Preferably, the tongues 30a, 30b of the first and second groups are separated from each other by notches 32. This makes it possible in particular to improve the flexibility of the tongues 30b of the second group of tongues.

More preferably, as shown in FIG. 4, the tongues 30a, 30b of the first and second groups of tongues extend angularly over a substantially equal angular sector S1.

In a second embodiment shown in FIGS. 5a and 5b, the annular ring 16 no longer comprises tongues but comprises, on an inner periphery, a set of bosses 33. The bosses 33 are in contact with the cylindrical outer surface 8 of the middle part 4 and form the braking means and sound damping 28. Such bosses 33 act radially in a plane in which the ring 16 extends, and not perpendicular to this plane like the tongues 30a, 30b of the first embodiment. In the variant not shown in the figures according to which the annular ring 16 is secured to the middle part 4, the bosses 33 are arranged on an outer periphery of the annular ring 16 and are in contact with an inner surface of the rotating bezel 14. In the exemplary embodiment illustrated in FIGS. 5a and 5b, the means for guiding in rotation 26 consist of the rest of the inner periphery of the ring 16, between the bosses 33.

In the embodiment of FIGS. 5a and 5b, the ring 16 comprises six bosses 33, distributed over the inner periphery of the ring 16 over 360 °. The bosses 33 are thus spaced two by two by 60 °.

In order to give the bosses 33 radial flexibility in the plane in which the ring 16 extends, the ring 16 preferably comprises a set of oblong slots 35. As illustrated in FIGS. 5a and 5b, each oblong slot 35 is formed in the thickness of the annular ring 16 opposite one of the bosses 33. In the embodiment of FIGS. 5a and 5b, the ring 16 thus comprises six oblong slots 35, distributed over 360 °. The oblong slots 35 are thus spaced two by two by 60 °.

Thanks to the radial flexibility of the bosses 33 in the plane in which the ring 16 extends, these can ensure braking of the rotation of the rotating bezel 14 around the middle part 4 by friction against the cylindrical outer surface 8, as well as a damping of the sound produced.

Braking the rotation of the telescope 14 by the means 28 has the advantage of smoothing the various clearances inside the system so that the user of the telescope does not feel them, as well as controlling the torque of the bezel making it softer. In addition, the braking and sound damping means 28 make it possible to reduce the noise produced by the rotation of the telescope and therefore to improve the user feeling.

The toothed ring 18 includes several teeth, for example 120 teeth, also distributed over its outer periphery over 360 °. Preferably, the toothed ring 18 also has, on its inner periphery, at least one lug 34 received in a notch 36 provided in the cylindrical outer surface 8 of the middle part 4. In the embodiment illustrated in FIG. 1, the toothed ring 18 comprises three lugs 34 distributed over 360 ° and spaced two by two by 120 °. The cylindrical outer surface 8 of the middle part 4 comprises three corresponding notches 36. This lug system 34 / notches 36 allows easy angular attachment of the toothed ring 18 to the middle part 4, while facilitating the positioning of the toothed ring 18 on the middle part 4. This system also makes it possible to guide the rotating bezel system 6 for its mounting on the middle part 4. Thus, by pressing from above the system 6, the lugs 34 are engaged in the notches 36, making it possible to snap the elements inside the system 6 and to clip the system 6 onto the middle part 4. The toothed ring 18 is formed from a single piece of material. The toothed ring 18 is for example made of a metal alloy, in particular a cobalt-based alloy (40% Co, 20% Cr, 16% Ni and. 7% Mo) commercially called phynox or steel typically a stainless steel for example 316L. As a variant, the toothed ring 18 can be made of a thermoplastic material, in particular a thermostable semi-crystalline thermoplastic material such as for example polyarylamide (Ixef®), polyetheretherketone (PEEK) or else a ceramic material (zirconia or alumina).

The spring means 20 cooperate elastically with the toothed ring 18. According to an exemplary embodiment illustrated in FIGS. 1 to 3, the spring means 20 consist of a spring ring. As shown in fig. 3, the toothed ring 18 is arranged to fit into the spring ring 20, that is to say that the toothed ring 18 is dimensioned to be able to be placed in the spring ring 20. The toothed ring 18 and the spring ring 20 are concentric and coplanar, and are held between the lower face 23b of the bezel 14 and an upper face of the retaining ring 16.

CH 714 808 A2 The spring ring 20 comprises at least one thinned portion 38 having at least one tooth 40 which is elastically and radially engaged with the toothed ring 18. In the embodiment illustrated in FIG. 1, the spring ring 20 comprises three thinned portions 38 distributed over 360 °, each thinned portion 38 having a tooth 40 arranged in a middle portion of the thinned portion 38. The three thinned portions 38 are spaced two by two by 120 °. The spring ring 20 extends in a plane in which it is capable of deforming elastically along a radius. The thinned portions 38 are arranged to increase the flexibility of the spring ring 20 in its plane. This configuration allows, when the toothed ring 18 is inserted inside the spring ring 20, the teeth 40 cooperate with the teeth of the toothed ring 18. In this configuration, each tooth 40 is in contact with the toothed ring 18 so that there is a rest position in which each tooth 40 is in a hollow between two teeth of the toothed ring 18. When the user grabs the bezel 14 and turns it, of the flexibility of the spring ring 20 conferred by the thinned portions 38, the spring ring 20 deforms elastically in its plane, allowing the teeth 40 to disengage from the hollows of the toothed ring 18 and to re-mesh in an adjacent tooth of the toothed ring 18. The bezel 14 then effectively rotates from a corresponding angular sector, to a new position.

Preferably, as illustrated in FIG. 1, the thinned portions 38 are thinned radially.

More preferably, the spring ring 20 has, on its outer periphery, at least one notch 42 in which a lug of the bezel 14 is engaged. In the exemplary embodiment illustrated in FIG. 1, the spring ring 20 comprises three notches 42 distributed over 360 ° and spaced two by two by 120 °, and the rotating bezel 14 comprises on a internal lateral face three corresponding lugs. The notches 42 are formed in portions 46 of the spring ring 20 which are thicker than the thinned portions 38, in the middle parts of these portions 46. Thus, the teeth 40 and the notches 42 form an alternation on the spring ring 20 , regularly distributed over 360 °. This lug / notch system 42 allows the spring ring 20 to be easily linked in rotation to the rotating bezel 14, while facilitating the positioning of the spring ring 20 in the bezel 14.

The spring ring 20 is formed from a single piece of material. The spring ring 20 is for example made of a metal alloy, having good spring properties, that is to say which easily deforms elastically while being able to deform significantly without undergoing plastic deformation, in particular of the phynox® or amorphous metal alloys. Of course, the spring ring 20 can also, as a variant, be made of a synthetic material.

The previous description of the annular rotating bezel system according to the invention was made with reference to a toothed ring angularly secured to the middle part, and to spring means angularly secured to the rotating bezel. However, those skilled in the art will understand that the reverse configuration is possible without departing from the scope of the present invention, that is to say that the toothed ring can be angularly secured to the rotating bezel, and the spring means angularly secured the middle.

claims

Claims (18)

1. Annular ring (16) for holding a system (6) of rotating bezel (14), intended to cooperate with a cylindrical outer surface (8) of a middle part (4) of a watch case (2) to allow the rotation of the rotating bezel (14) on the middle part (4), the annular ring (16) comprising means (26) for guiding the rotating bezel (14) in rotation around the middle part (4); characterized in that the annular ring (16) further comprises means (28) configured to slow the rotation of the rotating bezel (14) around the middle (4) and to dampen the sound. 2. Annular ring (16) according to claim 1, characterized in that it comprises on a periphery an alternation between tongues (30a) of a first group of tongues and tongues (30b) of a second group of tongues , the tongues (30a) of the first group and the tongues (30b) of the second group having dimensions in differentiated radial direction, the tongues (30a, 30b) of one of the first and second groups of tongues forming said guide means in rotation (26), the tongues (30a, 30b) of the other of the first and second groups of tongues forming said braking and sound damping means (28). 3. Annular ring (16) according to claim 2, characterized in that the tongues (30a) of the first group have dimensions in the radial direction smaller than those of the tongues (30b) of the second group, the tongues (30a) of the first group forming said means for guiding in rotation (26), the tongues (30b) of the second group being made up of segments which are more flexible than the tongues (30a) of the first group, said segments being able to flex axially and forming said braking means and sound damping (28). 4. Annular ring (16) according to claim 2 or 3, characterized in that the tongues (30a) of the first group and the tongues (30b) of the second group have differentiated thicknesses, so that the tongues (30a, 30b) of one of the first and second groups of tongues are more flexible than the tongues (30a, 30b) of the other of the first and second groups of tongues, the thickness being measured in an axial direction perpendicular to a plane in which s 'extends the bezel (14). 5. Annular ring (16) according to any one of claims 2 to 4, characterized in that the tongues (30a, 30b) of the first and second groups are separated from each other by notches (32). CH 714 808 A2 6. Annular ring (16) according to any one of claims 2 to 5, characterized in that the first and second groups of tabs each comprise six tabs (30a, 30b), the tabs (30a, 30b) of the first and second groups being distributed over 360 °, the tabs of the same group of tabs being spaced two by two by 60 °. 7. Annular ring (16) according to any one of claims 2 to 6, characterized in that the tongues (30a, 30b) of the first and second groups extend angularly over a substantially equal angular sector (S1). 8. Annular ring (16) according to any one of claims 2 to 7, characterized in that the tongues (30a) of the first group and the tongues (30b) of the second group are arranged on an inner periphery of the ring (16 ); the annular ring (16) being intended to be secured to the rotating bezel (14). 9. Annular ring (16) according to any one of claims 2 to 7, characterized in that the tongues (30a) of the first group and the tongues (30b) of the second group are arranged on an outer periphery of the ring (16 ); the annular ring (16) being intended to be secured to the middle part (4). 10. Annular ring (16) according to claim 1, characterized in that it comprises on an inner or outer periphery a set of bosses (33), said bosses (33) forming said braking and sound damping means ( 28). 11. Annular ring (16) according to claim 10, characterized in that it comprises a set of oblong slots (35), each oblong slot (35) being formed in the thickness of the annular ring (16) opposite d 'one of said bosses (33) so as to allow radial flexibility of the boss (33) in a plane in which the ring (16) extends, the thickness being measured in an axial direction perpendicular to said plane. 12. Annular ring (16) according to claim 10 or 11, characterized in that it comprises six bosses (33) distributed over 360 °, the bosses (33) being spaced two by two by 60 °. 13. Annular ring (16) according to any one of the preceding claims, characterized in that the annular ring (16) is formed from a single piece of material made of a plastic material, in particular PTFE, ethylene -tetrafluoroethylene, or polyoxymethylene. 14. System (6) of annular rotating bezel intended to be mounted for rotation on a middle part (4) of a watch case (2) inside which is housed a clockwork movement which extends in one plane, comprising a rotating bezel (14), an annular retaining ring (16), a toothed ring (18), and spring means (20) cooperating elastically with the toothed ring (18), said toothed ring (18) and said means springs (20) being held in an axial direction perpendicular to the plane of movement in the bezel (14) by the annular retaining ring (16), one of the toothed ring (18) and spring means (20) being arranged to be angularly secured to the rotating bezel (14), and the other being arranged to be angularly secured to the middle part (4), characterized in that the annular ring (16) conforms to any one of the preceding claims . 15. Watch case (2) comprising a middle part (4) and a system (6) provided with an annular rotating bezel (14) rotatably mounted on the middle part (4), characterized in that the system (6) of The annular rotating bezel conforms to claim 14. 16. Watch case (2) according to claim 15 when the annular ring (16) depends on claim 8 or one of claims 10 to 12, characterized in that the annular ring (16) is secured to the rotating bezel (14), the tongues (30a) of the first group and the tongues (30b) of the second group, or the bosses (33), being in contact with said cylindrical outer surface (8) of the middle part (4). 17. Watch case (2) according to claim 15 when the annular ring (16) depends on claim 9 or one of claims 10 to 12, characterized in that the annular ring (16) is secured to the middle part ( 4), the tongues (30a) of the first group and the tongues (30b) of the second group, or the bosses (33), being in contact with an inner surface of the rotating bezel (14). 18. Watch (1) comprising a watch case (2), characterized in that the watch case (2) conforms to any one of claims 15 to 17.