Mandrel for a clockwork barrel

Abstract

A spindle (10) for a watch spring barrel (100) includes: a longitudinal axis (A); a first member (1) including a first shoulder (13) intended to position a drum (4) or cover (3) accordingly; and a second member (2) attached to or fastened to the first member (1), the second member including a second shoulder (14) intended to position the drum (4) or cover (3) accordingly, the first member (1) and / or the second member (2) including a first pivot for the drum (4) or cover (3) accordingly. The surface (11), the first shoulder (13) and the second shoulder (14) are positioned on both sides of the first pivot surface (11), the first member (1) includes a third pivot surface (21) intended to mate with a first bearing (8) arranged in the blank (81), and the second member (2) includes a fourth pivot surface (22) intended to mate with a second bearing (9) arranged in the blank (91), and the first member (1) includes a second pivot surface (12) correspondingly for the cover (3) or the drum (4).

Description

Technical Field

[0001] This invention relates to a spindle for a watch mainspring barrel. It also relates to a watch mainspring barrel including such a spindle. Furthermore, it relates to a watch movement including such a spindle or such a mainspring barrel. Finally, it relates to a method for assembling a watch mainspring barrel and / or a watch movement and / or a watch. Background Technology

[0002] The mainspring barrel typically comprises a spindle that engages with a spring housed within a drum enclosed by a cover. The axial clearance and runout of the drum relative to the spindle are known to be difficult to control. This is because clearance and runout depend particularly on a long series of dimensions extending between the spindle, drum, and cover, and also on the potential deformation of the latter two components, especially during the assembly of the mainspring barrel. For example, the disc shape of the drum and cover may warp, forming a hollow, concave, or convex dome that inevitably affects its clearance and runout. To control clearance and runout, it is common practice for the watchmaker to calibrate the mainspring barrel.

[0003] US677689 describes a spring barrel comprising a two-piece mandrel, wherein a first member 12 is screwed into a second member 11. The assembly of these two members allows for the capture of a spring barrel cover 1 that pivots around the second member 11 via a jewel 9. The axial clearance of the cover 1 is then defined by a shoulder 14 of the second member 11 of the mandrel and a drum 21 fixed to the mandrel via the first member 12. During operation, the drum 21 and the cover 1 move relative to each other. Therefore, the drum 21 cannot be closed by the cover 1, thus failing to prevent contamination of the spring barrel or migration of lubricant. Summary of the Invention

[0004] The object of this invention is to provide a spring barrel mandrel that overcomes the aforementioned drawbacks and improves upon existing spring barrel mandrels. Specifically, this invention proposes a spring barrel mandrel that allows for improved control of the axial clearance and runout of the drum by significantly reducing a series of dimensions.

[0005] The mandrel according to the invention is defined in claim 1.

[0006] Different embodiments of the mandrel according to the invention are defined in claims 2 to 4.

[0007] The spring-loaded spring according to the invention is defined in claim 5.

[0008] Different embodiments of the spring box according to the present invention are defined in claims 6 to 11.

[0009] The watch movement according to the invention is defined in claim 12.

[0010] The embodiment of the watch movement according to the present invention is defined in claim 13.

[0011] The clock according to the invention is defined in claim 14.

[0012] The assembly method according to the invention is defined in claim 15. Attached Figure Description

[0013] The accompanying drawings illustrate, by way of example, embodiments of the clocks according to the present invention.

[0014] Figure 1 This is an axial cross-sectional view of an embodiment of a clock according to the present invention.

[0015] Figure 2 This is an exploded perspective view of an embodiment of the spring barrel spindle.

[0016] Figure 3 This is an axial cross-sectional view of an embodiment of the spring barrel spindle. Detailed Implementation

[0017] The following is for reference. Figures 1 to 3 An embodiment of the clock 300 according to the present invention will be described. The clock is, for example, a watch, particularly a wristwatch. The clock includes a clock movement 200. The clock movement 200 may be:

[0018] - Mechanical movements, especially automatic movements, or

[0019] - Hybrid movement.

[0020] The watch 300 also includes a housing designed to receive the watch movement 200 and protect it from external environmental influences.

[0021] The watch movement 200 includes a mainspring barrel 100. The mainspring barrel 100 includes:

[0022] - Drum 4,

[0023] - Cover 3,

[0024] - Main Clockwork 5, and

[0025] - Spring barrel spindle 10.

[0026] The drum 4 and the cover 3 form an assembly that defines the receiving portion 4a for the mainspring 5. The drum 4 and the cover 3 pivot about the mainspring barrel spindle 10.

[0027] Due to the elastic deformation of the mainspring, the mainspring barrel can store energy in the form of potential energy, which can be used to maintain the motion of the oscillator via the gear train.

[0028] One end (inner end) of the mainspring 5 engages with the spindle 10, and the other end (outer end) of the mainspring 5 engages with the drum 4, such that rotation of the spindle 10 relative to the drum 4 allows the mainspring 5 to wind in one direction and relax in another. More specifically, the mainspring 5 extends between the central portion diameter or central portion 5a of the spindle 10 and the inner diameter or inner wall 5b of the generally cylindrical drum 4. The central portion 5a includes means for hooking one end of the mainspring, and the inner wall 5b may specifically include notches for facilitating hooking of the other end of the mainspring 5. The mainspring 5 may optionally be provided with a sliding strap.

[0029] The mainspring barrel spindle 10 pivots within the blanks 81, 91 of the watch movement (e.g., bridges or plates). This pivoting can occur, particularly, in bearings, especially in jewels, bushings, or ball bearings attached to these blanks. Preferably, the mainspring barrel spindle 10 includes an upper pivot and a lower pivot designed to mate with a first bearing 8 and a second bearing 9, respectively. Preferably, the bearings are the first jewel 8 and the second jewel 9.

[0030] The upper pivot includes an upper pivot surface 21 and an upper shoulder 23. Similarly, the lower pivot includes a lower pivot surface 22 and a lower shoulder 24. The upper pivot surface 21 and the lower pivot surface 22 ensure that the spindle 10 pivots within the bearings 8 and 9, respectively. The axial clearance of the spring barrel 100, or more specifically, the axial clearance of the spindle 10, is ensured by the engagement of the upper shoulder 23 and the lower shoulder 24 with the bearings 8 and 9, respectively.

[0031] The spring barrel spindle 10 also includes two other pivots or pivoting parts, thereby allowing:

[0032] - The relative pivoting of drum 4 around axis 10, and

[0033] - The relative pivoting of cover 3 around the central axis 10.

[0034] The first pivoting surface 11 correspondingly allows the drum 4 or the cover 3 to pivot. The second pivoting surface 12 correspondingly allows the cover 3 or the drum 4 to pivot. Preferably, the first pivoting surface 11 and the second pivoting surface 12 mate with a first protrusion 41 formed on the drum 4 and a second protrusion 31 formed on the cover 3, respectively. These protrusions 31, 41 have cylindrical portions that extend in a direction substantially parallel to the axis of rotation A of the spring barrel. The axis A extends longitudinally relative to the spindle 10 and passes through the center of the spindle 10. These protrusions are made to increase the contact area on the pivoting surfaces 11, 12, which can reduce contact pressure and provide improved guidance, especially reducing the wobbling of the drum 4 and the cover 3.

[0035] The drum 4 is designed to receive the mainspring 5 within the receiving portion 4a. Therefore, the drum 4 receives most of the force or stress generated by the winding of the mainspring 5 via the spindle 10. At least, the drum 4 and the spindle 10 are components directly loaded by the winding of the mainspring 5.

[0036] The drum 4 includes teeth or any other device that enables the energy stored in the mainspring 5 to be transferred to the gear train of the watch movement.

[0037] Preferably, the cover 3 is assembled onto the drum 4, securing it to the drum 4, and thus creating a fixed assembly and forming a closed receiving portion 4a for the mainspring 5. The closed receiving portion 4a thus forms a sealed, dust-proof receiving portion and prevents potential migration of lubricant within the mainspring barrel. This closed receiving portion 4a also prevents the mainspring 5 from rotating due to friction with components such as blanks, bridging members, plates, moving parts, or mechanisms caused by the relative movement of the drum 4.

[0038] The cover 3 is preferably assembled to the drum 4 by clamping so that it can be removed, for example, by a watchmaker. More generally, the cover 3 can be assembled to the drum 4 by clamping and / or driving and / or riveting and / or gluing and / or welding.

[0039] In order to wind the mainspring 5, the specified wheel, or more specifically the ratchet 6, can be assembled with the spindle 10, or at least constrained to rotate with the spindle 10. Thus, the ratchet 6 is assembled to allow torque to be transmitted to the spindle 10. Conventionally, torque can be transmitted through the fit between a square portion formed (particularly machined) at the center of the ratchet 6 and a complementary geometry formed (particularly machined) on the spindle 10 and fitting into a square hole.

[0040] Alternatively or additionally, the ratchet 6 may be assembled with the spindle 10 by means of threaded connection, drive, riveting, gluing or welding.

[0041] The unique feature of this design is that the spring barrel mandrel 10 is made of two components or two separate parts 1 and 2. The first component 1 and the second component 2 are assembled together so that they are completely fixed to each other (fixed connection) to form the spring barrel mandrel 10. They can be assembled by driving and / or gluing and / or welding and / or threaded connection and / or riveting or any other means to fix the two components 1 and 2.

[0042] The first component 1 of the mandrel 10 may include:

[0043] - Central part 5a,

[0044] - Upper pivoting surface 21 and upper shoulder 23 designed to mate with the first bearing 8,

[0045] The first pivot surface 11 and / or the second pivot surface 12 allow the drum 4 and / or the cover 3 to pivot.

[0046] Preferably, the ratchet 6 is assembled on the first component 1 of the spindle 10 to ensure optimal and / or reliable torque transmission between the ratchet 6 and the hook of the mainspring 5 during the winding of the mainspring 5.

[0047] To prevent any assembly or torque resistance problems, the central portion 5a is advantageously integrally formed with the first component 1 of the spindle 10.

[0048] The second component 2 may include:

[0049] - Lower pivot surface 22, and

[0050] - Lower shoulder 24 designed to mate with the second bearing 9.

[0051] The second component 2 may include the first pivot surface 11. In other words, if it is not already included in the first component 1, the second component 2 may include the first pivot surface 11.

[0052] Therefore, the first member 1 advantageously includes a third pivot surface 21 intended to mate with a first bearing 8 arranged in the blank 81, and the second member 2 advantageously includes a fourth pivot surface 22 intended to mate with a second bearing 9 arranged in the blank 91.

[0053] The fact that the spring barrel spindle 10 consists of two components 1 and 2 advantageously allows the cover 3 or drum 4 to be defined between the two:

[0054] - Including a first shoulder 13 formed in or on the first member 1, and

[0055] - Included in or formed on the second member 2, the second shoulder 14.

[0056] Therefore, the cover 3 or drum 4 can be defined axially along the longitudinal axis A relative to the first member 1 and / or the second member 2 or more generally relative to the mandrel 10.

[0057] The spindle 10 therefore includes:

[0058] - First component 1, which includes a first shoulder 13 intended to position the drum 4 or cover 3 accordingly, and

[0059] - A second component 2 attached or fastened to the first component 1, the second component including a second shoulder 14 intended to position the drum 4 or cover 3 accordingly.

[0060] The first component 1 and / or the second component 2 include a first pivot surface 11 corresponding to the drum 4 or the cover 3. In addition, a first shoulder 13 and a second shoulder 14 are arranged on both sides of the first pivot surface 11.

[0061] The first shoulder 13 and the second shoulder 14 are opposite to each other or face each other, or are arranged to face each other, so as to form an upper axial stop and a lower axial stop respectively, thereby restricting the axial movement of the cover 3 or the drum 4 in two translational directions along axis A. Preferably, the first shoulder 13 and the second shoulder 14 are adjacent to the first pivot surface 11 and are positioned on both sides of the first pivot surface 11.

[0062] - First axial protrusion 41 or second axial protrusion 31, and

[0063] - First shoulder section 13 and second shoulder section 14

[0064] Advantageously arranged such that the first axial protrusion 41 or the second axial protrusion 31 is axially defined by the first shoulder 13 and the second shoulder 14 relative to the longitudinal axis A.

[0065] As a result, the axial clearance J1 of the drum 4 or cover 3 is advantageously provided by the mandrel 10, and depends only on the minimum of two dimensions. Therefore, the axial clearance J1 can be the result of the following dimensions:

[0066] - First dimension C1, which defines the length of the cylindrical portion of the first protrusion 41 or the second protrusion 31 on the pivoting surface of the drum 4 or the cover 3, and

[0067] - A second dimension C2 that defines the length of the first pivot surface 11.

[0068] Dimensions C1 and C2 are preferably formed by high-precision turning. Therefore, unlike known mainspring barrels in the prior art, the proposed solution allows for improved control of the axial clearance J1, as this clearance is generated by a very short series of dimensions and advantageously does not depend on the axial position of bearings 8, 9 or the axial deformation of drum 4 or cover 3. Advantageously, using such a solution, watchmakers do not need to, and are no longer able to, correct the axial clearance J1 of the mainspring barrel body 100.

[0069] In a conventional spring barrel, the spring barrel mandrel comprises a series of increasingly larger diameters and shoulders from each end until it reaches a central portion with the largest diameter, which typically corresponds to the diameter of the central portion. Using a spring barrel mandrel 10 consisting of two components 1, 2 also offers the advantage of allowing greater design freedom, particularly by making it possible to reduce the diameter of the central portion 5a. In fact, at the interface of the two components 1, 2, it is advantageous to obtain a first pivot surface 11 with a diameter less than or equal to the diameter of the adjacent fourth pivot surface 22.

[0070] Therefore, the central portion 5a adjacent to the first pivot surface 11 can typically have a smaller diameter compared to a conventional mainspring barrel. This results in an increase in the volume of the mainspring housing and, consequently, an increase in power reserve.

[0071] exist Figures 1 to 3 In the embodiment specifically shown, the cover 3 is fastened to the spring barrel drum 4 by peripheral clamping, thereby forming a fixed assembly having a closed receiving portion 4a for the mainspring 5.

[0072] exist Figures 1 to 3 In the embodiment specifically shown, the drum 4 and the cover 3 pivot on a first pivot surface 11 and a second pivot surface 12, respectively, which are formed on the first member 1 of the mandrel 10. The first pivot surface 11 is located between the following portions:

[0073] - Central part 5a, and

[0074] - The lower end of the first component 1.

[0075] The second pivot surface 12 is located between the following portions:

[0076] - Central part 5a, and

[0077] - Third pivot surface 21.

[0078] The upper shoulder 23 is adjacent to the third pivot surface 21 and the second pivot surface 12.

[0079] A square portion is machined into the upper end of the first component 1 of the mainspring barrel spindle 10 to receive the ratchet 6. The upper end of the first component 1 also includes an internal thread 7a designed to receive a screw 7, which secures the ratchet 6 to the mainspring barrel spindle 10. The square portion, the internal thread 7a, and the screw 7 are advantageously arranged concentrically with the rotation axis A of the mainspring barrel. Preferably, the ratchet 6 is thus secured to the first component 1 of the spindle 10.

[0080] The second component 2 is assembled onto the first component 1 at its lower end. The second component 2 preferably includes a portion 2a, particularly a stud or strut 2a, intended to be driven into a hole 1a formed in the first component 1 of the spindle 10. The hole 1a and the stud 2a may be concentric with the axis A of the spindle 10, and more generally with the axis of rotation A of the spring barrel. However, the reverse is also possible, where the stud is made in the first component and the hole is made in the second component. As another alternative, the first component 1 and the second component 2 can also be assembled without creating the hole 1a or the stud 2a, using a fastening system that allows for precise alignment.

[0081] The second component 2 also includes a fourth pivot surface 22 and an adjacent lower shoulder 24.

[0082] Advantageously, the first shoulder 13 and the second shoulder 14 are adjacent to and positioned on either side of the first pivot surface 11 to provide optimal control over the axial clearance J1 of the drum 4 within the spindle 10. Figures 1 to 3 In the specific embodiment shown, the first shoulder 13 is located on the first member 1, and the second shoulder 14 is located on the second member 2.

[0083] Therefore, the axial clearance J1 depends only on two dimensions, C1 and C2. Furthermore, although the drum 4 experiences most of the forces and stresses generated by the mainspring 5, any deformation of it will not affect the axial clearance J1. However, for the spindle 10, the axial position of the cover 3 depends on the axial position of the drum 4 and any deformation therein. Therefore, sufficient axial clearance must be provided between the cover 3 and the spindle 10 to prevent any jamming or excessive friction during pivoting. This structure also improves the retention of the cover 3 on the drum 4 by preventing the cover 3 from experiencing axial stresses caused by pivoting of the cover 3 around the spindle 10. In other words, with this arrangement, the spindle 10 can advantageously no longer exert contact forces on the cover 3 that could remove it.

[0084] The first dimension C1 defines the length of the pivoting surface of the drum 4, and the second dimension C2 defines the length of the first pivoting surface 11 on the first member 1 of the mandrel. Therefore, the clearance J1 is a result of dimensions C1 and C2.

[0085] This invention also relates to a method for assembling a mainspring barrel, a watch movement, or a watch. One implementation of the above-described mainspring barrel is described in detail below. The assembly method includes at least the following steps:

[0086] a. The first component 1 for supplying the mandrel 10;

[0087] b. Supply drum 4 or cover 3 accordingly;

[0088] c. Place the drum 4 or the cover 3 on the first pivot surface 11 formed on the first member 1 of the spindle 10 or on a portion of the first pivot surface 11;

[0089] d. Supply the second component 2 of the mandrel 10;

[0090] e. Fasten or assemble the second component 2 of the mandrel 10 onto the first component 1 of the mandrel 10.

[0091] Alternatively, the assembly method includes at least the following steps:

[0092] a. The second component 2 supplies the mandrel 10;

[0093] b. Supply drum 4 or cover 3 accordingly;

[0094] c. Place the drum 4 or the cover 3 on the first pivot surface 11 or a portion of the first pivot surface 11 formed on the second member 1 of the spindle 10 accordingly;

[0095] d. Supply the first component 1 of the mandrel 10;

[0096] e. Fasten or assemble the first component 1 of the mandrel 10 onto the second component 1 of the mandrel 10.

[0097] Fastening or assembling can accordingly axially define the drum 4 or cover 3 (relative to axis A) between the two components 1 and 2.

[0098] The assembly method may also include the following steps:

[0099] f. Accordingly, supply cover 3 or drum 4;

[0100] g. Place the mainspring 5;

[0101] h. Place the cover 3 or drum 4 onto the second pivot surface 12 accordingly;

[0102] i. Assemble the cover (3) and the drum (4), particularly by clamping and / or driving and / or riveting and / or gluing and / or welding.

[0103] The assembled watch barrel 10 is then mounted onto the blank to form the watch movement 200.

[0104] In this assembly method, step e is performed after step c.

[0105] In the described embodiment, the ratchet 6 is assembled onto the first member 1 of the spindle. However, regardless of the embodiment and variation, the ratchet 6 can also be assembled onto the second member 2. Therefore, a square portion will be formed on the second member. An internal thread 7a can then be formed on the second member 2 or on the lower end of the first member 1. In this last variation, the second member 2 can then be fastened to the first member 1 by a screw 7, which also fastens the ratchet 6. The second member 2 and the ratchet 6 are then sandwiched between the screw 7 and the first member 1.

[0106] As an alternative, regardless of the implementation and variation, the spring box can also be configured such that a ratchet 6 is assembled between the first member 1 and the second member 2. Therefore, the ratchet 6 allows the axial clearance of the drum 4 or cover 3 to be limited by including a first shoulder 13 or a second shoulder 14.

[0107] As an alternative, regardless of the implementation method and variation, the ratchet 6 may be included in the first member 1 or the second member 2, or formed on the first member 1 or the second member 2.

[0108] In the illustrated embodiment, the positions of drum 4 and cover 3 can also be reversed. Then, cover 3 will pivot upwards on the lower side and drum 4 will pivot upwards on the upper side.

[0109] exist Figures 1 to 3 In the illustrated embodiment, the first member 1 includes a first pivot surface 11 for the drum 4. Alternatively, regardless of the embodiment and variant, the second member 2 may include a first pivot surface for the drum or cover. As another alternative, regardless of the embodiment and variant, the first and second members may together include a first pivot surface for the drum or cover. In this last case, the first pivot surface for the drum or cover:

[0110] - Partially formed on the first component, and

[0111] - Partially formed on the second component.

[0112] Regardless of the implementation method and variations, the maximum diameter of the mandrel 1 can be less than 3.5 mm, or less than 2.5 mm, or approximately 1.8 or 1.4 mm.

[0113] Regardless of the implementation method and variations, the diameter of the first pivot surface 11 may be at least substantially equal to or smaller than the diameter of the fourth pivot surface 22.

[0114] With the above-described solution, the two-piece mainspring barrel spindle can increase the internal volume available for the mainspring while reducing the space occupied by the mainspring barrel or the safety space, as well as the clearance around the mainspring barrel within the movement, particularly by improving the control of the axial clearance of the drum. This solution also minimizes runout, thereby preventing excessive contact between the cover or drum and the blank.

[0115] More specifically, this structure advantageously allows:

[0116] - Improve control over the drum's axial clearance and runout by significantly reducing a series of dimensions and thus reducing the resulting tolerance for axial clearance.

[0117] - Axial clearance is unaffected by potential deformation of the barrel drum or cover.

[0118] - Improve lid retention by preventing the lid from being subjected to axial stress caused by the pivoting of the lid around the mandrel.

[0119] Finally, the structure also provides greater freedom in defining the spring barrel, particularly by enabling a reduction in the diameter of the central portion of the mandrel.

[0120] Throughout this document, "blank" is used to refer to bridging components or plates.

Claims

1. A spindle (10) for a watch spring barrel (100), comprising: - Longitudinal axis (A). - First component (1), which includes a first shoulder (13) intended to position the drum (4) or cover (3) accordingly, and - A second member (2) attached or fastened to the first member (1), the second member including a second shoulder (14) intended to position the drum (4) or cover (3) accordingly. The first component (1) and / or the second component (2) include a first pivot surface (11) for the drum (4) or cover (3). The first shoulder (13) and the second shoulder (14) are positioned on both sides of the first pivot surface (11). The first component (1) includes a third pivoting surface (21) designed to mate with a first bearing (8) disposed within the blank (81), and The second component (2) includes a fourth pivot surface (22) designed to mate with a second bearing (9) arranged within the blank (91). The first component (1) includes a second pivot surface (12) for the cover (3) or drum (4).

2. The spindle (10) for a watch spring barrel (100) according to claim 1, wherein: - The first shoulder (13) and the second shoulder (14) are opposite each other, or - The first shoulder (13) and the second shoulder (14) face each other, or - The first shoulder (13) and the second shoulder (14) are arranged to face each other. So as to axially define a drum (4) or cover (3) relative to the first member (1) and / or the second member (2) along the longitudinal axis (A).

3. The mandrel (10) for a watch spring barrel (100) according to any of the preceding claims, wherein the first component (1) includes a central portion (5a).

4. The spindle (10) for a watch spring barrel (100) according to any of the preceding claims, wherein the first component (1) is fastened to the second component (2) by threaded connection and / or by gluing and / or by driving and / or by welding and / or by riveting.

5. A watch spring barrel (100), comprising: - Drum (4) - Cover (3) - Mainspring (5), and - The mandrel (10) according to any one of the preceding claims.

6. The watch spring barrel (100) according to claim 5, wherein the cover (3) is assembled on the drum (4) to form a closed receiving portion (4a) together with the drum (4).

7. The watch spring barrel (100) according to claim 6, wherein the cover (3) is assembled onto the drum (4) by clamping and / or driving and / or riveting and / or gluing and / or welding.

8. The watch spring barrel (100) according to any one of claims 5 to 7, wherein the watch spring barrel (100) includes a ratchet (6), and wherein the ratchet (6) is fastened to the first member (1) of the spindle (10) or the second member (2) of the spindle (10).

9. The watch spring barrel (100) according to any one of claims 5 to 8, wherein the drum (4) includes a first axial protrusion (41) that engages with the first pivot surface (11) or the second pivot surface (12).

10. The watch spring barrel (100) according to any one of claims 5 to 9, wherein the cover (3) includes a second axial protrusion (31) that engages with the second pivot surface (12) or the first pivot surface (11).

11. The watch spring barrel (100) according to claims 9 and 10, wherein: - The first axial protrusion (41) or the second axial protrusion (31), and - The first shoulder (13) and the second shoulder (14). Arranged such that the first axial protrusion (41) or the second axial protrusion (31) is axially defined by the first shoulder (13) and the second shoulder (14) relative to the longitudinal axis (A).

12. A watch movement (200) comprising a spindle (10) according to any one of claims 1 to 4 and / or a watch barrel (100) according to claims 5 to 10.

13. The watch movement (200) according to claim 12, wherein the watch movement (200) includes a first bearing (8) cooperating with the third pivot surface (21) and a second bearing (9) cooperating with the fourth pivot surface (22).

14. A clock (300), particularly a wristwatch, comprising a spindle (10) according to any one of claims 1 to 4 and / or a mainspring barrel (100) according to any one of claims 5 to 11 and / or a clock movement (200) according to claim 12 or 13.

15. A method for assembling a watch mainspring barrel (100), particularly a watch mainspring barrel (100) according to any one of claims 5 to 11, and / or a watch movement (200), particularly a watch movement (200) according to claim 12 or 13, and / or a watch (300), particularly a watch (300) according to claim 14, the assembly method comprising at least the following steps: - The first component (1) of the supply mandrel (10); - Accordingly, supply a drum (4) or a cover (3); - Place the drum (4) or the cover (3) accordingly onto the first pivot surface (11) formed on the first member (1) of the spindle (10) or onto a portion of the first pivot surface (11); - A second component (2) supplies the mandrel (10); - Fasten or assemble the second component (2) of the mandrel (10) onto the first component (1) of the mandrel (10); or At least the following steps: - The second component (2) of the supply mandrel (10); - Accordingly, supply a drum (4) or a cover (3); - Place the drum (4) or the cover (3) accordingly onto the first pivot surface (11) formed on the second member (2) of the spindle (10) or onto a portion of the first pivot surface (11); - The first component (1) that supplies the mandrel (10); - Fasten or assemble the first component (1) of the mandrel (10) onto the second component (2) of the mandrel (10).

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