Watch case and method for connecting a watch case middle to a bezel of the watch case

Abstract

The present invention relates to a watch case (1000) comprising: - a middle (2; 2'), - a bezel (1; 1'), arranged to be connected to the middle (2; 2'), - an annular axial-retention element (3; 3'), arranged to hold the bezel (1; 1') on the middle (2; 2'), one of either the middle (2; 2') and the bezel (1; 1') comprising a first housing (200, 100') for receiving the annular axial-retention element (3; 3') when the bezel (1; 1') is not connected to the middle (2; 2'), the bezel (1; 1') and / or the middle (2; 2') being arranged to be moved axially so as to bring the bezel (1; 1') closer to the middle (2; 2'), in order to connect the bezel (1; 1') to the middle (2; 2'), the respective other of either the bezel (1; 1') or the middle (2; 2') comprising a second housing (100; 200'), arranged to cooperate with the first housing (200; 100') so as to create a third housing (300; 300') for receiving the annular axial-retention element (3; 3') once the bezel (1; 1') is connected to the middle (2; 2'). The dimensions and the shape of the annular axial-retention element (3; 3') are the same in the third housing (300; 300') and outside of the watch case (300; 300') after having been received in the third housing (300; 300').

Description

Watch case and method for attaching a watch case middle to a watch case bezel technical field

[0001] The present invention relates to a watch case and a method for linking a case middle of a watch case to a bezel of the watch case. State of the art

[0002] Many watches feature a watch case with a rotating bezel, designed to turn around an axis. This axis is usually perpendicular to the crystal or dial of the watch movement and typically passes through the center of the crystal or dial. The bezel may display markings that the user can position at a chosen angle. A bezel can be used in a watch for various purposes, such as quickly determining the time in a second time zone or indicating the duration of a dive.

[0003] Watch boxes, including watch boxes offered by the plaintiff, generally include: - a build, - a telescope arranged to rotate around an axis, the telescope comprising a toothed mechanism, - a spring ring arranged to be fixed to the case, the spring ring comprising four leaf springs arranged on a first diameter of the spring ring, and arranged to cooperate with the teeth, in order to produce a click when rotating the bezel.

[0004] In these watch cases, a spring (a confounding arm spring or a polygonal spring with a round cross-section, for example a flat spring) cooperating with both the bezel and the case allows axial retention of the bezel, namely retention of the bezel along a direction perpendicular to a principal plane of the bezel.

[0005] This solution has some disadvantages: it is difficult to guarantee synchronization of the four leaf springs when they interact with the scope's teeth, which increases the noise produced during the scope's rotation. Furthermore, the scope's rotational torque is not constant, which exacerbates play and noise: in particular, there are variations in the rotational torque from zero to a peak value exceeding 1 N cm, resulting in a sensation of play and noise for the user.

[0006] Finally, in this solution the bezel must have a certain width in order to cooperate with the axial retaining spring, which does not allow maximizing the diameter of the dial.

[0007] Document EP0403717 relates to a watch with a rotating bezel, in which the bezel is mounted on the case by means of an inclined multi-pronged wire spring. This spring presses the bezel downwards against a shoulder on the case. A toothed crown is freely positioned between the bezel and the case. The angular position of this crown relative to the bezel is determined by crown pins that engage in notches on the bezel. A flat spring with elastic leaves that rattle and engage with the teeth of the crown is housed in a groove on the case.

[0008] Document EP1182521 relates to a rotating bezel that can be moved vertically between a lower stop point and an upper stop point. When in the lower stop point, it is held in place by a positioning elastic element held by a bezel positioning groove and a case positioning protrusion. In this position, a rotation restriction ring prevents further rotation. By pushing the rotating bezel via its surface to the When moving in a vertical direction, the elastic positioning element is bent and passes over the positioning protrusion on the case and interacts with an inclined upper face of the case, thereby stopping the rotating bezel at an upper stopping point. At the upper stopping point, the rotating bezel 1 can be rotated freely.

[0009] Document CH703400 relates to a watch case in which a retaining ring is freely rotated around the bezel's axis of rotation within a groove in the case middle, allowing the bezel to be axially locked in the vertical direction. The retaining ring comprises an inner annular portion and a peripheral portion. The inner portion is designed to be elastically snapped into the groove in the case middle. To achieve this, the retaining ring is split to allow for elastic deformation. Brief summary of the invention

[0010] One aim of the present invention is to provide a watch case free from the limitations of known watch cases.

[0011] Another objective of the present invention is to offer an alternative watch case to known watch cases.

[0012] Another aim of the present invention is to provide a watch case in which the bezel takes up less space in width compared to some known solutions, thus allowing the diameter of the dial to be maximized.

[0013] Another object of the present invention is to propose a method for linking a watch case to a watch case bezel free from the limitations of known methods.

[0014] Another objective of the present invention is to propose a method for linking a watch case to a watch case bezel as an alternative to known methods.

[0015] According to the invention, these goals are achieved in particular by means of the watch case according to claim 1 and the method for linking a case middle of a watch case to a bezel of the watch case according to claim 17.

[0016] The watch case according to the invention comprises a case middle and a bezel arranged to be connected to the case middle, that is, to be fixed to the case middle. The bezel is not necessarily a rotating bezel.

[0017] The watch case according to the invention also includes an axial retaining ring, arranged to hold the bezel on the case middle. In this context, the adjective "axial" indicates a direction perpendicular to a principal plane of the bezel.

[0018] According to the invention, one of the case and the bezel comprises a first housing for receiving the axial retaining ring when the bezel is not attached to the case. The bezel and / or the case is / are arranged to be moved axially so as to bring the bezel closer to the case (or vice versa), in order to attach the bezel to the case.

[0019] According to the invention, one of the bezels respectively the case comprises a second housing, arranged to cooperate with the first housing so as to create a third housing to receive the axial retaining annular element once the bezel is linked to the case.

[0020] In the watch case according to the invention, the dimensions and shape of the axial retaining ring element are the same in the third housing and outside the watch case after it has been received in the third housing. In other words, the axial retaining annular element is in its nominal form both when it is in the third housing and when it is outside the watch case in a stress-free state, after having been received in the third housing.

[0021] In other words, the axial retaining ring element does not work in compression once the bezel is linked to the case.

[0022] In one embodiment, the dimensions and shape of the axial retaining ring are the same in the first and third housings. In other words, the axial retaining ring is in its nominal shape both in the first and third housings.

[0023] In other words, the axial retaining ring does not work in compression once the bezel is attached to the case; it only deforms during a time interval within which there is relative axial movement between the bezel and the case, in order to establish the connection between the bezel and the case. Specifically, the axial retaining ring deforms within a time interval between the moment of initial contact between the bezel and / or the case and the axial retaining ring, and the end of the axial movement of the bezel and / or the case.

[0024] In other words, the elastic (not plastic) characteristics of the axial retaining annular element are exploited during a time range within the interval in which there is relative axial movement between the bezel and the case, in order to achieve the connection between the bezel and the case.

[0025] In another embodiment, the dimensions or shape of the axial retaining ring element are different in the first and third housings: this does not indicate that the element The axial retaining ring works under compression once the bezel is attached to the case, because in this embodiment the axial retaining ring is not compressed; in particular, it is free from any compression, including compression in a direction perpendicular to the principal plane of the watch case. Indeed, according to the invention, the dimensions and shape of the axial retaining ring are the same in the third housing and outside the watch case after it has been received in the third housing, which is not the case if the axial retaining ring were compressed. These different dimensions and / or shape in the first and third housings can occur, for example, if the axial retaining ring were to flex during the attachment between the bezel and the case, without being compressed.During plasticizing, the axial retaining ring changes its shape and therefore its dimensions. However, its volume remains unchanged.

[0026] In the watch case according to the invention, the bezel takes up less space in width compared to some known solutions, thus allowing the diameter of the dial to be maximized.

[0027] In one embodiment, the dimensions and shape of the axial retaining annular element are the same in the first housing and in the third housing.

[0028] In one embodiment, the dimensions and / or shape of the axial retaining annular element are different in the first housing and in the third housing.

[0029] In one embodiment, one of the bezels or the case is arranged to come into contact with the axial retaining annular element during the axial movement of the bezel and / or the case, the axial movement of the bezel and / or the case ending when the bezel is linked to the case, the axial retaining annular element is arranged to deform during a period of time included in the interval of said axial displacement of the bezel and / or case.

[0030] In one embodiment, the axial retaining annular element is arranged to remain permanently in contact with a first and a second contact surfaces of the first housing.

[0031] In one embodiment, the second contact surface corresponds to an edge of the first housing.

[0032] In one embodiment, the axial retaining annular element is arranged to come into contact with a friction surface of the first housing during a time range within the interval of the axial displacement of the bezel and / or case.

[0033] In one embodiment, the friction surface is substantially parallel to the first contact surface.

[0034] In one embodiment, the axial retaining annular element is arranged to come into contact with a bonding surface of the second housing when the bezel is linked to the case.

[0035] In one embodiment, the axial retaining annular element is arranged to come into contact with at least one edge of the second housing during axial movement of the bezel and / or case.

[0036] In one embodiment, the axial retaining annular element has a substantially trapezoidal cross-section.

[0037] In one embodiment, the telescope is a telescope that rotates around an axis.

[0038] In one embodiment, the axial retaining annular element is arranged to dampen sounds during rotation of the scope.

[0039] In one embodiment, the axial retaining annular element is arranged to create a substantially constant rotational torque of the telescope, thanks to the friction of the axial retaining annular element on the telescope during the rotation of the telescope.

[0040] In one embodiment, the rotational torque is within the range of 3 N cm to 7 N cm.

[0041] The invention also relates to a timepiece, comprising the watch case according to the invention.

[0042] The invention also relates to a method for attaching a watch case to a watch case bezel, the method comprising the steps of: - to house an axial retaining element in a first recess of one of the case and the bezel, the retaining element being arranged to hold the bezel onto the case, - axially move the bezel and / or case, so as to bring the bezel closer to the case, in order to link the bezel to the case, one of the bezel respectively the case comprising a second housing, arranged to cooperate with the first housing so as to create a third housing for the axial retaining element when the bezel is linked to the case, in which the dimensions and shape of the annular axial retaining element are the same in the third housing and outside the watch case in a stress-free state, after having been received in the third housing. Brief description of the figures

[0043] Examples of implementation of the invention are given in the description illustrated by the accompanying figures, in which: Figure 1 illustrates a perspective view of a watch case according to one embodiment of the invention. Figure 2 illustrates a perspective view of a portion of the watch case in Figure 1, according to section AA. Figure 3 illustrates a side view according to section BB of the portion of the watch case in Figure 2. Figure 4 illustrates a side view according to section AA of the watch case of figure 1, without the bezel. Figure 5 illustrates a perspective view along section AA of a portion of the watch case in Figure 4. Figure 6 illustrates a side view according to section AA of a portion of the watch case of figure 1, and in particular of the bezel. Figure 7 illustrates a perspective view from below along section AA of the portion of the telescope in Figure 6. Figure 8 illustrates a perspective view from above along section AA of a portion of a telescope opposite to the portion of a telescope in Figure 7. Figure 9 illustrates a perspective view of the axial retaining ring element of the watch case in Figure 1. Figure 10 illustrates a top view of the axial retaining ring element of Figure 9. Figure 11 illustrates a CC cross-sectional view of the axial retaining annular element of Figure 10. Figures 12A to 12E illustrate steps of a method for linking a case of a watch case to a bezel of the watch case, according to an embodiment of the invention. Figures 13A to 13E illustrate steps of a method for linking a case middle of a watch case to a bezel of the watch case, according to another embodiment of the invention. Figure 14 illustrates a perspective view of a watch case spring ring according to one embodiment of the invention. Figure 15 illustrates a top view of the spring ring of Figure 14. Figure 16 illustrates a side view from the left of the spring ring of Figure 15. Figure 17 illustrates a side view from below of the spring ring of Figure 15. Figure 18 illustrates a DD cross-sectional view of the spring ring of Figure 15. Figure 19 illustrates a side view from the right of the spring ring of Figure 15. Example(s) of embodiment(s) of the invention

[0044] In the following description, provided by way of example, a rotating bezel will be used for simplicity. However, the invention is not limited to such a bezel, but also relates to watch cases comprising fixed bezels, namely bezels that do not rotate.

[0045] In unclaimed embodiments, it is possible to replace the bezel and case middle of the claimed watch case with other watch elements or components intended to be linked via the claimed axial retaining element, for example a watch movement intended to be linked to an element of the watch case, a watch case back intended to be linked to the case middle, etc.

[0046] Figure 1 illustrates a perspective view of a watch case 1000 according to one embodiment of the invention. It comprises a case middle 2 and a bezel 1, the bezel 1 being arranged to rotate about an axis, in particular about the Z-axis. The Z-axis is perpendicular to a principal plane XY of the bezel 1. In one embodiment, the Z-axis is perpendicular to the crystal or the dial of the watch movement (not shown) and passes through its center. In one embodiment, one or more indicator elements of the watch (not shown) are arranged to rotate about the Z-axis or about another axis. In one embodiment, the bezel 1 is arranged to rotate in only one direction; in another embodiment, it is arranged to rotate in both directions. Generally, a crystal (not shown) is mounted directly onto the case middle 2 and is not fixed to the bezel 1.In another embodiment, a glass is assembled on the bezel 1 and rotates as a unit with the latter.

[0047] The telescope 1 in Figure 1 has a polygonal shape, specifically dodecagonal. However, the invention is not limited to such a shape, but includes all other shapes, for example and without limitation circular, oval shapes, etc.

[0048] The scope 1 in Figure 1 has edges comprising grooves 13, to improve the user's grip on the scope. However, the invention is not limited to the presence of such grooves, nor to their number, shape, or arrangement as illustrated in Figure 1.

[0049] Case 2 generally houses a watch movement (not illustrated) and is usually closed on the movement bridge side by a case back (not illustrated), which is opposite a crystal (not illustrated).

[0050] The case 2 may be, for example and without limitation, made of metal, precious metal, ceramic, etc. The bezel 1 may be made of the same material as the case or of a different material. The bezel 1 may include a portion, in particular an upper portion, comprising graduations or markers 14.

[0051] In one embodiment, the case 2 conventionally includes a crown (not shown) for winding the watch and / or moving the indicator(s). The crown may be housed in a crown slot 21. In another embodiment not shown, the case 2 also includes one or more activation elements such as buttons or push-buttons for performing other functions, for example, but not limited to, the functions of a chronograph watch, etc.

[0052] In one embodiment, the case 2 conventionally includes lugs 22 (removable or not), allowing the case to be linked to strands of a bracelet (not illustrated).

[0053] Figure 2 illustrates a perspective view of a portion of the 1000 watch case from Figure 1, according to section AA. Figure 3 illustrates another cross-section of the portion of the 1000 watch case in Figure 2.

[0054] In one embodiment, the telescope 2 comprises a circular track 11, visible for example in Figure 2, having a first diameter, and a toothed track 12, also visible in Figure 2, arranged on a circle having a second diameter different from the first diameter. In one embodiment, the circular track 11 is adjacent to the toothed track 12. The circular track 11 is smooth, i.e., without teeth.

[0055] In one embodiment, the diameter of the teeth 12 is smaller than the diameter of the circular track 11, as can be seen for example in Figure 2. In another embodiment (not illustrated), the diameter of the teeth 12 is larger than the diameter of the circular track 11.

[0056] The 1000 watch case also includes an axial retaining ring element 3, arranged to hold the bezel 1 onto the case middle 2.

[0057] Figure 9 illustrates a perspective view of the axial retaining ring element 3 of the watch case of Figure 1. Figure 10 illustrates a top view of the axial retaining ring element 3 of Figure 9. Figure 11 illustrates a CC sectional view of the axial retaining ring element 3 of Figure 10.

[0058] In one embodiment, the axial retaining ring element 3 is a ring having a single-part cross-section in the XZ plane. In one embodiment, this cross-section is polygonal. In another embodiment, this cross-section is concave and / or convex. In one embodiment, at least a portion of the perimeter of this cross-section is curved.

[0059] In one embodiment, this section is a quadrilateral, in particular a trapezoid, one embodiment of which can be seen for example in figures 2, 3 and 11.

[0060] In one embodiment, the axial retaining annular element 3 is monobloc, namely it is made monolithically.

[0061] In one embodiment, the axial retaining ring element 3 is made of a deformable material, particularly one deformable in bending. In one embodiment, it is made of a polymer, for example, a thermoplastic elastomer. In another embodiment, it is made of Hytrel.

[0062] In one embodiment, the axial retaining annular element 3 is arranged to dampen sounds during the rotation of the bezel 1.

[0063] In one embodiment, the axial retaining annular element 3 is arranged to allow the removal of the bezel 1 from the case 2 when an axial force greater than a threshold is applied to the bezel 1 and / or the case 2. In one embodiment, this threshold is related to the resistance exerted by the axial retaining annular element 3.

[0064] In one embodiment, the axial retaining annular element 3 is arranged to create a substantially constant rotational torque of the telescope 1, thanks to the friction induced by the axial retaining annular element 3 during the rotation of the telescope 1.

[0065] In this context, the expression "the axial retaining ring element 3 is arranged to create a substantially constant rotational torque of the telescope 1" indicates that the axial retaining ring element 3 contributes to the creation of this substantially constant rotational torque. Indeed, the constant rotational torque of the telescope 1 is not obtained not only via the reaction force due to the friction of the axial retaining element 3 on the rotating telescope 1, but also thanks to the cooperation between the first leaf spring of a spring ring 4 which will be discussed later, and the circular track 11 of the telescope 1. In particular, this substantially constant rotational torque is created by the action of the first leaf spring which pushes the telescope upwards and by the reaction of the seal (namely of the annular axial retaining element) which holds the telescope.

[0066] In one embodiment, the contribution to the substantially constant rotational torque due to the interaction between the first leaf spring 4 and the circular track is approximately 50%, namely 50% ± 10%. In this embodiment, this percentage is due to the fact that the force exerted by the first leaf spring on the bezel 1 is the same as the reaction force of the seal on the bezel 1 (the bezel 1 is in equilibrium), the only difference in terms of torque being due to the radius of contact between the first leaf spring and the bezel 1 and between the seal and the bezel 1.

[0067] In one embodiment, the contribution to the substantially constant rotational torque due to the cooperation between the first leaf spring and the circular track is (slightly) greater than 50%, for example it is greater than 55%, if the first leaf spring presses on the bezel 1 corresponding to a diameter greater than the support of the seal on the bezel 1: indeed, the torque being equal to the force times the lever arm (namely the radius), and the forces being equal, only the radius has an impact on the contribution to the torque.

[0068] The rotational torque of the telescope 1 is greater than that of known solutions. In one embodiment, the rotational torque is in the range of 3 N cm to 7 N cm.

[0069] Figures 12A to 12E illustrate steps in a process for linking, for example by pressing, a case 2 to a bezel 1, according to an embodiment of the invention.

[0070] In one embodiment, the case 2 includes a first housing 200 for receiving the axial retaining ring 3. One embodiment of this housing 200 is shown, for example, in Figure 12A. In this embodiment, the housing 200 is substantially mirror-image in the shape of a P, that is, a P shape obtained with axial symmetry about the Z-axis, and it comprises a first U-shaped portion 201 lying along the X-axis, and a second, substantially rectangular portion 202. As will be seen, this embodiment is not limited to such a shape.

[0071] As can be seen in Figure 12B, the housing 200 is arranged to receive, at least partially, the axial retaining annular element 3. In the embodiment of Figure 12B, a portion of the axial retaining annular element 3 does indeed protrude from the housing 200 of the case 2. However, in this embodiment, the axial retaining annular element 3 remains properly housed in the housing 200, so that it is integral with the case 2.

[0072] As can be seen in Figure 12B, the housing 200 comprises a first contact surface 203 and a second contact surface 204 which are arranged to remain permanently in contact with (i.e. to touch permanently) the axial retaining annular element 3.

[0073] In this context, the expression "permanently" indicates that there is contact between the axial retaining annular element 3 and both the first contact surface 203 and the second contact surface 204 when the bezel 1 is not linked to the case 2 (Figure 12B), when the bezel 1 and / or the case 2 is(s) moved axially so as to bring the bezel 1 closer to the case 2 in order to link the bezel 1 to the case 2 (Figure 12C and 12D) and when the bezel 1 is linked to the case 2 (Figure 12E).

[0074] In one embodiment, the second contact surface 204 corresponds to an edge of the first housing 200.

[0075] In one embodiment, the housing 200 also includes a friction surface 205. The axial retaining annular element 3 is not in contact with this friction surface 205 when the bezel 1 is not linked to the case 2: there is a distance di, visible for example in figures 12B and 12C, between this friction surface 205 and the axial retaining annular element 3 when the bezel 1 is not linked to the case 2.

[0076] The axial retaining annular element 3 is not in contact with this friction surface 205 when the bezel 1 is linked to the case 2: there is a distance d2, visible for example in figure 12E, between this friction surface 205 and the axial retaining annular element 3 when the bezel 1 is linked to the case 2.

[0077] In one embodiment, the distance di is equal to the distance d2. In another embodiment (not shown), both the distance di and d2 are zero, provided that the contact between the axial retaining annular element 3 and the friction surface 205 does not deform the axial retaining annular element 3.

[0078] In one embodiment, the axial retaining annular element 3 is in contact with this friction surface 205 only during a time range within the interval in which the bezel 1 and / or the case 2 is(s) moved axially so as to bring the bezel 1 closer to the case 2, in order to link the bezel 1 to the case 2, as seen for example in Figure 12D.

[0079] In one embodiment, this friction surface 205 is substantially parallel to the first contact surface 203.

[0080] In one embodiment, and as can be seen for example in Figure 12C, the axial retaining annular element 3 therefore comprises a surface 303 substantially parallel to the first contact surface 203 of the housing 200, and at least a portion of which is arranged to enter into in permanent contact with this first contact surface 203; a surface 305 substantially parallel to the friction surface 205 of the housing 200 and of which at least a portion is arranged to come into contact with the friction surface 205 when the bezel 1 and / or the case 2 is(s) moved axially so as to bring the bezel 1 closer to the case 2, in order to link the bezel 1 to the case 2; a surface 301 substantially parallel to a first friction surface 101 of a housing 100 of the bezel; and a surface 302, substantially parallel to the surface 301, of which a portion is arranged to come into permanent contact with this second contact surface 204 of the housing 200 of the case.

[0081] As discussed, the bezel 1 and / or the case 2 are arranged to be moved axially so as to bring the bezel 1 closer to the case 2, in order to link the bezel 1 to the case 2: in the embodiment of figures 12A to 12E, it is the bezel 1 which is moved along the direction of arrow E in figure 12D, to link the bezel 1 to the case 2.

[0082] During this movement, in the embodiment shown in Figures 12A to 12E, the bezel 1 comes into contact with the axial retaining annular element 3, the axial movement of the bezel 1 ending when the bezel 1 is connected to the case 2 (Figure 12E). In particular, the axial retaining annular element 3 (and specifically a portion of its surface 301) first comes into contact with the first friction surface 101 of the bezel 1 (this contact not being visible in Figures 12A to 12E) and then with a second friction surface 102 of the bezel 1 (as shown in Figure 12D), this second friction surface 102 forming, together with the first friction surface 101 of the bezel 1, an edge 104 of the bezel 1.

[0083] During this movement, the axial retaining annular element 3 deforms, in particular deforms by bending, for example along the direction of arrow F in figure 12D.

[0084] During this movement, only a portion of the surface 303 of the axial retaining annular element 3 remains in contact with the first contact surface 203 of the housing 200, as seen in Figure 12D.

[0085] During this movement, the surface 305 of the axial retaining annular element 3 slides on the friction surface 205, for example in the direction of arrow G in Figure 12D.

[0086] In the embodiment shown in Figure 12C, the housing 100 of the telescope 1 has a substantially trapezoidal shape, in particular a rectangular trapezoid. However, this shape is not limiting, and any other shape may be used, provided that the housing 100 includes a connecting surface 106, arranged to form an edge 107 with the second friction surface 102.

[0087] Indeed, the axial retaining annular element 3 (in particular a portion of its surface 306) comes into contact with this edge 107 of the housing 100 during the axial movement of the bezel 1 and / or the case 2. In the embodiment of figures 12A to 12E, the axial retaining annular element 3 also comes into contact with the edge 104 of the housing 100 during the axial movement of the bezel 1 and / or the case 2.

[0088] When the axial movement of the bezel 1 and / or the case 2 is completed, i.e. when the bezel 1 is linked to the case 2, as for example seen in Figure 12E, the housing 100 cooperates with the housing 200 so as to create a third housing 300 which receives the axial retaining annular element 3.

[0089] In the configuration of Figure 12E, at least a portion of the surface 306 of the axial retaining annular element 3 comes into contact with the connecting surface 106 of the housing 100. In a mode of In realization, the surface 306 of the axial retaining annular element 3 is substantially parallel to the connecting surface 106 of the housing 100.

[0090] In one embodiment, the friction between the surface 306 of the axial retaining annular element 3 and the connecting surface 106 of the housing 100 contributes to the creation of a substantially constant rotational torque of the telescope 1.

[0091] In the configuration of Figure 12E, the first contact surface 203 of the housing 200 is in contact with (all) the surface 303 of the axial retaining annular element 3, the second contact surface 204 of the housing 200 is in contact with a portion of the surface 302 of the axial retaining annular element 3 and there is a distance d2 between the surface 305 of the axial retaining annular element 3 and the friction surface 205 of the housing 200.

[0092] Advantageously, the dimensions and shape of the axial retaining annular element 3 are the same in the third housing 300 and outside the watch case after being received in the third housing 300. In other words, the axial retaining annular element 3 is in its nominal shape both when it is in the third housing 300 and when it is outside the watch case in a stress-free state, after being received in the third housing 300.

[0093] In other words, the axial retaining annular element 3 does not work in compression once the bezel 1 is linked to the case 2.

[0094] In one embodiment, the dimensions and shape of the axial retaining ring element 3 are the same in the first housing (Figure 12B) and in the third housing (Figure 12E). In other words, the axial retaining ring element 3 does not work in compression once the bezel 1 is attached to the case 2 (Figure 12E); it only deforms during a time range within the interval in in which there is a relative axial movement between the bezel 1 and the case 2 (figure 12D), in order to achieve the connection between the bezel 1 and the case 2. In other words, the axial retaining annular element 3 is in its nominal form both when it is in the first (figure 12B) and in the third housing 300 (figure 12E).

[0095] In another embodiment (not illustrated), the dimensions or shape of the axial retaining ring element 3 are different in the first housing 100 and in the third housing 300, for example in the case of plasticization of the axial retaining ring element 3 during the connection between the bezel 1 and the case 2.

[0096] Figures 13A to 13E illustrate steps of a method for linking, for example by pressing, the case 2' to the bezel 1', according to another embodiment of the invention: in this embodiment, the annular axial retaining element 3' is received in a housing 100' of the bezel l' when the bezel l' is not yet linked to the case 2' (figure 13B).

[0097] In this embodiment, the telescope includes a first housing 100' for receiving the axial retaining annular element 3'. One embodiment of this housing 100' is shown, for example, in Figure 13A. In this embodiment, the housing 100' is substantially P-shaped "in mirror image," namely a shape obtained with symmetry about the X-axis, specifically it comprises a first portion 101' that is substantially rectangular, and a second portion 102' that is U-shaped and lying along the X-axis. As will be seen, this embodiment is not limited to such a shape.

[0098] As can be seen in Figure 13B, the housing 100' is arranged to receive, at least partially, the axial retaining ring element 3'. In the embodiment of Figure 13B, a portion of the axial retaining ring element 3' does indeed protrude from the housing 100' of the bezel 1'. However, in this embodiment, the retaining ring element axial 3' remains well housed in housing 100', so that it is fixed to the telescope l'.

[0099] As can be seen in Figure 13B, the housing 100' comprises a first contact surface 103' and a second contact surface 104' which are arranged to remain permanently in contact with (i.e. to touch permanently) the axial retaining annular element 3'.

[0100] As in the embodiment of figures 12A to 12E, the expression "permanently" indicates that there is contact between the axial retaining annular element 3' and both the first contact surface 103' and the second contact surface 104' when the bezel l' is not linked to the case 2' (figure 13C), when the bezel l' and / or the case 2' is(s) moved axially so as to bring the bezel l' closer to the case 2' in order to link the bezel l' to the case 2' (figure 13C and 13D) and when the bezel l' is linked to the case 2' (figure 13E).

[0101] In one embodiment, the second contact surface 104' corresponds to an edge of the housing 100'.

[0102] In one embodiment, the housing 100' also includes a friction surface 105'. The axial retaining annular element 3' is not in contact with this friction surface 105' when the bezel l' is not linked to the case 2': there is a distance of i, visible for example in figure 13B, between this friction surface 105' and the axial retaining annular element 3' when the bezel l' is not linked to the case 2'.

[0103] The axial retaining annular element 3' is not in contact with this friction surface 105' when the bezel is linked to the case 2': there is a distance of 2, visible for example in figure 13E, between this friction surface 105' and the axial retaining annular element 3' when the bezel is linked to the case 2'.

[0104] The considerations made for di and d2 also apply to the distances of i and d2.

[0105] The axial retaining annular element 3' is in contact with this friction surface 105' only during a time range within the interval in which the bezel l' and / or the case 2' is(s) moved axially so as to bring the bezel l' closer to the case 2', in order to link the bezel l' to the case 2', as seen for example in figure 13D.

[0106] In one embodiment, this friction surface 105' is substantially parallel to the first contact surface 103'.

[0107] In one embodiment and as seen for example in Figure 13C, the axial retaining annular element 3' therefore comprises a surface 303' substantially parallel to the first contact surface 103' of the housing 100' and of which at least a portion is arranged to be in permanent contact with this first contact surface 103'; a surface 305' substantially parallel to the friction surface 105' of the housing 100' and of which at least a portion is arranged to be in contact with the friction surface 105' when the bezel l' and / or the case 2' is(s) moved axially so as to bring the bezel l' closer to the case 2', in order to link the bezel l' to the case 2'; a surface 301' substantially parallel to a first friction surface 201' of a housing 200' of the case 2';and a surface 302', substantially parallel to the surface 301', a portion of which is arranged to come into permanent contact with this second contact surface 104' of the housing 100' of the telescope l'.;

[0108] As discussed, the bezel l' and / or the case 2' are arranged to be moved axially so as to bring the bezel l' closer to the case 2', in order to link the bezel l' to the case 2': in the embodiment of Figures 13A to 13E, it is the case 2' that is moved along of the direction of arrow E' in figure 13D, to link the scope l' to the case 2'.

[0109] During this movement, in the embodiment shown in Figures 13A to 13E, the case 2' comes into contact with the axial retaining annular element 3', the axial movement of the case 2' ending when the bezel is attached to the case 2' (Figure 13E). In particular, the axial retaining annular element 3' (and specifically a portion of its surface 301') first comes into contact with the first friction surface 201' of the case 2' (this contact not being visible in Figures 13A to 13E) and then with a second friction surface 202' of the case 2' (as shown in Figure 13D), this second friction surface 202' forming, together with the first friction surface 201' of the case 2', an edge 204' of the case 2'.

[0110] During this movement, the axial retaining annular element 3' deforms, in particular deforms by bending, for example along the direction of the arrow F' in figure 12D.

[0111] During this movement, only a portion of the surface 303' of the axial retaining annular element 3' remains in contact with the first contact surface 103' of the housing 100', as seen in Figure 13D.

[0112] During this movement, the surface 305' of the axial retaining annular element 3' slides on the friction surface 105', for example in the direction of arrow G' in Figure 13D.

[0113] In the embodiment of Figure 13C, the housing 200' of the case 2 has a substantially trapezoidal shape, in particular a rectangular trapezoid. However, this shape is not limiting, and any other shape may be used, provided that the housing 200' includes a connecting surface 206', arranged to form an edge 207' with the second friction surface 202'.

[0114] Indeed, the axial retaining annular element 3' (in particular a portion of its surface 301') comes into contact with this edge 207' of the housing 200' during the axial movement of the bezel l' and / or the case 2'. In the embodiment of figures 13A to 13E, the axial retaining annular element 3'3' (in particular a portion of its surface 301') also comes into contact with the edge 204' of the housing 200' during the axial movement of the bezel l' and / or the case 2'.

[0115] When the axial displacement of the bezel l' and / or the case 2' ends, namely when the bezel l' is linked to the case 2', as for example visible in figure 13E, the housing 200' cooperates with the housing 100' so as to create a third housing 300' which receives the axial retaining annular element 3'.

[0116] In the configuration of Figure 13E, at least a portion of the surface 306' of the axial retaining annular element 3 comes into contact with the connecting surface 206' of the housing 100. In one embodiment, the surface 306' of the axial retaining annular element 3' is substantially parallel to the connecting surface 206' of the housing 200'.

[0117] In one embodiment, the friction between the surface 306' of the axial retaining annular element 3' and the connecting surface 206' of the housing 200' contributes to the creation of a substantially constant rotational torque the bezel l'.

[0118] In the configuration of Figure 13E, the first contact surface 103' of the housing 100' is in contact with (all) the surface 303' of the axial retaining annular element 3', the second contact surface 104' of the first housing 100' is in contact with a portion of the surface 302' of the axial retaining annular element 3' and there is a distance of 2 between the surface 305' of the axial retaining annular element 3' and the friction surface 105' of the housing 100'.

[0119] Advantageously, the dimensions and shape of the axial retaining ring element 3' are the same in the third housing 300' and outside the watch case after it has been received in the third housing 300'. In the illustrated embodiment, the dimensions and shape of the axial retaining ring element 3' are also the same in the housing 100' (Figure 13B) and in the third housing 300' (Figure 13E). In other words, the axial retaining ring element 3' does not work in compression once the bezel l' is linked to the case middle 2' (Figure 13E); it only deforms during a time range belonging to the interval in which there is relative axial movement between the bezel l' and the case middle 2' (Figure 13D), in order to achieve the link between the bezel l' and the case middle 2'.In other words, the axial retaining annular element 3' is in its nominal form both when it is in housing 100' (Figure 13B) and in housing 300' (Figure 13E).

[0120] In another embodiment (not illustrated), the dimensions or shape of the axial retaining ring element 3' are different in the first housing 100' and in the third housing 300', for example in the case of plasticization of the axial retaining ring element 3' during the connection between the bezel l' and the case 2', without being compressed.

[0121] In the embodiments shown in Figures 12A to 12E and 13A to 13E, insertion of the bezel onto the case is facilitated, but removal of the bezel is more difficult. However, removal of the bezel remains possible, provided sufficient force is applied (for example, a force greater than the equivalent forces in the event of an impact, for example 5000g), without damaging the axial retaining ring.

[0122] In the embodiment of Figures 12A to 12E, to extract the bezel 1 from the configuration of Figure 12E, it is necessary to axially move the bezel 1 and / or the case 2, so as to move the telescope 1 of the case 2. For example, it is possible to move the telescope 1 axially in a direction opposite to that of arrow E in figure 12D.

[0123] During this movement, the axial retaining annular element 3, and in particular its surface 306, slides on the connecting surface 106 of the telescope and then on the edge 107 (Figure 12E). The surface 301 of the axial retaining annular element 3 then comes into contact with the second friction surface 102, the edge 104 and then the first friction surface 102, to return to the configuration of Figure 12C.

[0124] During this movement, (at least a portion of) the first contact surface 203 and (at least a portion of) the second contact surface 204 are arranged to remain permanently in contact with the axial retaining annular element 3. During this movement, the axial retaining annular element 3 comes into contact with the friction surface 205, and moves away from it when the bezel 1 is no longer linked to the case 2, as illustrated for example in Figure 12C.

[0125] The considerations made regarding the extraction of telescope 1 in the embodiment shown in Figures 12A to 12E apply to the extraction of telescope l' in the embodiment shown in Figures 13A to 13 E , mutatis mutandis.

[0126] Figure 14 illustrates a perspective view of a spring ring 4 for a watch case 1000 according to one embodiment of the invention. Figures 15 to 19 illustrate different views of this spring ring 4. This spring ring 4 is arranged to be fixed to the case and to cooperate with the bezel of the embodiments shown in Figures 1 to 8, 12A to 12E, and 13A to 13E. For simplicity, reference will be made to the embodiment shown in Figures 1 to 8 and 12A to 12E in the following text.

[0127] This spring ring 4 is arranged to be fixed to the case 2 and to cooperate with the bezel 1, as can be seen, for example, in Figures 2 and 3. The spring ring 4 includes, in particular, at least one first A spring-blade 41 is arranged on a first diameter of the spring ring 4, for example on an external diameter. In the embodiment of Figure 14, there are three first spring-blades 41. Each of these first spring-blades 41 comprises a body 410, a fixed end 411, and a free end 412.

[0128] Each of these first leaf springs 41 is arranged to cooperate with the circular track 11 of the telescope 1 (visible in Figure 3), in order to create a substantially constant rotational torque of the telescope. As discussed, the constant rotational torque of the telescope 1 is not obtained solely through the cooperation between the first leaf spring(s) 41 and the circular track 11, but also through another reaction force, namely the reaction force due to the friction of the axial retaining element 3 on the rotating telescope 1.

[0129] The spring ring 4 also includes at least one second leaf spring 42 arranged on a second diameter of the spring ring, for example on an internal diameter. In the embodiment of Figure 14, there is only one second leaf spring 42. However, several second leaf springs 42 may also be present. Each of these second leaf springs 42 comprises a body 420, a fixed end 421 and a free end 422.

[0130] Each of these second leaf springs 42 is arranged to cooperate with the teeth 12 of the telescope 1 (visible in figure 3), in order to produce a click when rotating the telescope 1.

[0131] The spring ring 4 therefore performs several functions, namely it helps to create a constant torque while also enabling a click to be made when rotating the telescope 1. These functions are decomposed, as they are performed by the interaction between the first leaf spring 41 and the circular track 11 of the telescope 1, respectively by the interaction between the second leaf spring 42 and the teeth 12 of the telescope 1.

[0132] Thanks to this spring ring 4 which performs several functions, the 1000 watch case has fewer components compared to known watch cases.

[0133] Thanks to the spring ring 4, the rotational torque of the bezel 1 can be adjusted as needed. The spring ring 4 also allows for independent adjustment of both the rotational torque and the noise (the "click") of the bezel during its rotation. The presence of two tracks on the bezel (one toothed 12 and the other smooth 11) and two diameters for the spring blades of the spring ring 4 enables independent adjustment of the rotational torque and the "click." For example, if only the constant torque value needs to be increased, only the winding of the spring blade(s) 41 that rub against the track 11 of the bezel can be increased. If only the click needs to be modified, only the winding of the spring blade(s) 42 that engage with the teeth of the track 12 can be modified, or the teeth themselves can be changed.

[0134] The spring ring 4 also allows for a greater rotational torque of the telescope 1 compared to known solutions. In one embodiment, the rotational torque is within the range of 3 N cm to 7 N cm. The rotational torque also depends on the number of the first leaf springs 41: the greater this number, the greater the rotational torque of the telescope 1. In one embodiment, the larger the diameter of the telescope 1, the greater the rotational torque exerted by a user.

[0135] Thanks to the spring ring 4, the telescope 1 produces a controlled and defined noise during its rotation, compared to the noise of known solutions. In one embodiment, the telescope 1 produces a reduced noise during its rotation compared to the noise of certain known solutions.

[0136] In one embodiment, the body 410 of the first leaf spring(s) 41 and the body 420 of the second leaf spring(s) 42 form an angle α (visible for example in figure 14) with respect to a principal plane of the spring ring 4 (which is substantially parallel to the principal plane of the telescope 1). Preferably, but not necessarily, these angles are all equal.

[0137] In one embodiment, the first spring(s) 41 and the second spring(s) 42 are arranged to push the bezel 1 towards an upper face of the watch case 1000. In this context, the upper face of the watch case 1000 is the one that includes the dial, and which is opposite a lower face including the bottom of the watch case 1000.

[0138] In one embodiment, the rotational torque of the telescope 1 also depends on the angle a: the larger this angle, the greater the rotational torque of the telescope 1.

[0139] In one embodiment, the rotational torque of the telescope 1 also depends on the width w (visible in figure 15) of each first leaf spring 41: the larger this width, the larger the rotational torque of the telescope 1 will be.

[0010] In one embodiment, the rotational torque of the scope 1 also depends on the length I (visible in Figure 15) of each first leaf spring 41. Longer leaves, combined with increased winding, increase the robustness of the system, namely, they allow it to withstand geometric variations that are small at the winding point without significant impact. In other words, the longer the leaves and the more winding can be used, the smaller the geometric variations of the leaves relative to this winding, and the more robust the system.

[0141] In one embodiment, the first leaf spring(s) 41 and the second leaf spring(s) 42 are equidistant (in angle), namely they are arranged so that the angle separating two adjacent leaf springs is always the same.

[0142] In one embodiment, the spring ring 4 includes an orientation (or angular positioning) element 45 of the spring ring 4 relative to the case 4. In the embodiment of figure 45, this orientation element is a hook, but other orientation elements known to those skilled in the art may be used instead of the hook.

[0143] In one embodiment, the spring ring 4 includes a fixing element 43 for attaching the spring ring 4 to the frame 2 for each first or second leaf spring. These fixing elements 43 also prevent undesirable deformation of the spring ring 4.

[0144] In the embodiment of figure 14, each fastening element 43 is a through hole, which cooperates with a screw (not shown), however other fastening elements known to those skilled in the art may be used instead of the hole-screw assembly, for example a clip system, etc.

[0145] In one embodiment, the angular distance between a hole and the fixed end of a corresponding leaf spring is less than 1°, for example equal to 0.6°.

[0146] In one embodiment, the attachment of the spring ring 4 to the case 2 has an impact on the rotational torque of the bezel 1. In one embodiment, the attachment is adjustable (for example, the screw is more or less tight), which allows the rotational torque of the bezel 1 to be adjusted.

[0147] In one embodiment, the spring ring 4 includes elements which allow both the attachment to the case 2 of the spring ring 4 and its orientation relative to the case 2.

[0148] The free end 412 of each first leaf spring 41 can form a first angle, which can be different from that (a) formed by the body 410 of each first leaf spring 41.

[0149] The free end 422 of each second leaf spring 42 can form a second angle, which may be different from that (a) formed by the body 420 of each first leaf spring 42. The second angle may be different from that of the first angle of the free end 412 of each first leaf spring 41, as can be seen in Figure 14 for example.

[0150] In one embodiment, the first leaf spring(s) 41 and the second leaf spring(s) 42 comprise a contact portion with the track 11 and the teeth 12, respectively, and an end portion comprising the free end 412 and 422, respectively, the contact portion being distinct from the end portion. This ensures that the contact with the track 11 and the teeth 12 does not occur at the free end 412 and 422, respectively, of each leaf spring, thus providing a controllable contact that is not at the edge of the free end 412 and 422. In another embodiment, the contact portion coincides with the end portion.

[0151] In one embodiment, the spring ring 4 is a single piece.

[0152] In one embodiment, the spring ring 4 is made of a material having a high yield strength (e.g., equal to or greater than 1500 MPa), high stiffness (e.g., equal to or greater than 180 GPa), which is polishable, which has resistance to fatigue and / or corrosion, and / or which is easily manufacturable (e.g., via conventional processes such as cutting, bending, etc.).

[0153] In one embodiment, the spring ring 4 is made of spring steel, durnico or Durimphy®.

[0154] In one embodiment, the spring ring 4 is made of an austenitic non-magnetic material, for example phynox.

[0155] In one embodiment, the rotational torque of the telescope 1 also depends on the material of each first leaf spring 41.

[0156] In one embodiment, the teeth 11 of the telescope 1 are arranged so that the telescope 1 can rotate in only one direction of rotation relative to the axis of rotation Z. In another embodiment, the teeth 11 of the telescope 1 are arranged so that the telescope 1 can rotate in two opposite directions of rotation relative to the axis of rotation Z.

[0157] The spring ring 4 can be made: - by cutting the first spring blade(s) 41 and the second spring blade(s) 42 from a body of the spring ring, - by bending the first spring blade(s) 41 and the second spring blade(s) 42, so that the body of the first spring blade(s) 41 and the second spring blade(s) 42 form an angle α with respect to a principal plane of the spring ring. These angles α may all have the same value or may have different values.

[0158] The spring ring 4 can be used in place of known spring rings and the watch case 1000 can be compatible with existing watch models. Reference symbols used in the figures: 1. Bezel 2. Circular track 3. Tooth 4. Graduation / mark 2. Case 1. Crown housing 2. Horn 3. Axial retaining ring Ring spring 1 First blade 2 Second blade 3 Fixing element 5 Guiding element 00, 100' Bezel housing 01 First friction surface of housing 100 02 Second friction surface of housing 100 03' First contact surface of housing 100' 04' Second contact surface of housing 100' 04 Edge of housing 100 05' Friction surface of housing 100' 06 Connecting surface of housing 100 07 Edge of housing 100 00, 200' Case housing 01 First portion of housing 200 01' First friction surface of housing 200' 02 Second portion of housing 200 02' Second friction surface of housing 200' 03 First contact surface of housing 200 04 Second contact surface of housing 200 04' Edge of housing 200' 06' Housing connection surface 200' 07' Housing edge 200' 300, 300' Third dwelling 301, 301' Surface of the axial retaining annular element 3 302, 302' Surface of the axial retaining annular element 3 303, 303' Surface of the axial retaining annular element 3 305, 305' Surface of the axial retaining annular element 3 306, 306' Surface of the axial retaining annular element 3 410 Body of the first blade 41 411 Fixed end of the first blade 41 412 Free end of the first blade 41 420 Body of the second blade 42 421 Fixed end of the second blade 42 422 Free end of the second blade 42 1000 Watch Box AA Cup BB Cup CC Coupe DD Cut di, d2 Distance d'i, d'2 Distance E, E' Arrow F, F' Arrow G, G' Arrow Length w Width XY Plan Z-axis angle

Claims

Claims 1. Watch box (1000) including: - a build (2; 2'), - a bezel (1; l'), arranged to be linked to the caseband (2; 2'), - an annular axial retaining element (3; 3'), arranged to hold the bezel (1; l') on the caseband (2; 2'), one of the caseband (2; 2') and the bezel (1; l') comprising a first housing (200, 100') for receiving the annular axial retaining element (3; 3') when the bezel (1; l') is not connected to the caseband (2; 2'), the bezel (1; l') and / or the caseband (2; 2') being arranged to be moved axially so as to bring the bezel (1; l') closer to the caseband (2; 2'), in order to connect the bezel (1; l') to the caseband (2; 2'), one of the bezel (1; l') respectively the caseband (2; 2') comprising a second housing (100; 200'), arranged to cooperate with the first housing (200; 100') so as to create a third housing (300; 300') to receive the annular axial retaining element (3; 3') once the bezel (1; 1') is connected to the caseband (2; 2'), wherein the dimensions and shape of the annular axial retaining element (3;3') are the same in the third housing (300; 300') and outside the watch case (300; 300') after being received in the third housing (300; 300').; 2. Watch case (1000) according to claim 1, the dimensions and shape of the annular axial retaining element (3; 3') are the same in the first housing (200; 100') and in the third housing (300; 300').

3. Watch case (1000) according to claim 1, the dimensions and / or the shape of the annular axial retaining element (3; 3') are different in the first housing (200; 100') and in the third housing (300; 300').

4. Watch case (1000) according to one of claims 1 to 3, one of the bezel (1; 1') respectively the caseband (2; 2') being arranged to enter in contact with the annular axial retaining element (3; 3') during the axial displacement of the bezel (1; l') and / or the caseband (2; 2'), the axial displacement of the bezel (1; l') and / or the caseband (2; 2') ending when the bezel (1; l') is connected to the caseband (2; 2'), wherein the annular axial retaining element (3; 3') is arranged to deform during a period of time included in the interval of said axial displacement of the bezel (1; l') and / or the caseband (2; 2').

5. Watch case (1000) according to one of claims 1 to 4, the annular axial retaining element (3; 3') being arranged to remain permanently in contact with a first and a second contact surfaces (203, 204; 103', 104') of the first housing (200; 100').

6. Watch case (1000) according to claim 5, the second contact surface (204; 104') being in correspondence with an edge of the first housing (200; 100').

7. Watch case (1000) according to one of claims 1 to 6, the annular axial retaining element (3; 3') being arranged to come into contact with a friction surface (205; 105') of the first housing (200; 100') during a time range included in the interval of the axial displacement of the bezel (1; 1') and / or the caseband (2; 2').

8. Watch case (1000) according to claim 7, the friction surface (205; 105') being substantially parallel to the first contact surface (203; 103').

9. Watch case (1000) according to one of claims 1 to 8, the annular axial retaining element (3; 3') being arranged to come into contact with a connecting surface (106; 206') of the second housing (100; 200') when the bezel (1; 1') is connected to the caseband (2; 2').

10. Watch case (1000) according to one of claims 1 to 9, the annular axial retaining element (3; 3') being arranged to come into contact with at least one edge (104, 107; 204', 207') of the second housing (100, 200') during the axial movement of the bezel (1; 1') and / or the caseband (2; 2').

11. Watch case (1000) according to one of claims 1 to 10, the annular axial retaining element (3; 3') having a substantially trapezoidal section.

12. Watch case (1000) according to one of claims 1 to 11, the bezel (1; 1') being a bezel rotating around an axis (Z).

13. Watch case (1000) according to claim 12, the annular axial retaining element (3; 3') being arranged to dampen sounds during rotation of the bezel (1; 1').

14. Watch case (1000) according to one of claims 12 to 13, the annular axial retaining element (3; 3') being arranged to create a substantially constant rotational torque of the bezel (1; l'), thanks to the friction of the annular axial retaining element (3; 3') on the bezel (1; l') during rotation of the bezel (1; l').

15. Watch case (1000) according to claim 14, the rotational torque being in the range 3 N cm to 7 N cm.

16. Timepiece, comprising the watch case (1000) according to one of claims 1 to 15.

17. Method for connecting a case middle (2; 2') of a watch case (1000) to a bezel (1; 1') of the watch case (1000), the method comprising the steps of: - house an axial retaining element (3; 3') in a first housing (200; 100') of one of the caseband (2; 2') and the bezel (1; 1'), the retaining element (3; 3') being arranged to hold the bezel (1; 1') on the caseband (2; 2'), - axially moving the bezel (1; l') and / or the caseband (2; 2') so as to bring the bezel (1; l') closer to the caseband (2; 2'), in order to connect the bezel (1; l') to the caseband (2; 2'), one of the bezel (1; l') respectively the caseband (2; 2') comprising a second housing (100; 200'), arranged to cooperate with the first housing (200; 100') so as to create a third housing (300; 300') for the axial retaining element (3; 3') when the bezel (1; l') is connected to the caseband (2; 2'), wherein the dimensions and shape of the annular axial retaining element (3; 3') are the same in the third housing (300; 300') and outside the watch case (300; 300') in a stress-free state, after being received in the third housing (300; 300').

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