CH705487A2 - Assembly barrel for use in keyless watch, has driving spring, and drum that is mounted at end of barrel, and longitudinal adjustment unit arranged with regard to direction of pin between drum and driving spring - Google Patents

Abstract

The barrel has a driving spring (2), and a drum (3) that is mounted at an end (21) of the barrel. Another end (22) of the barrel is arranged with a reception surface (5) that comprises a plug (4) that is arranged coaxial to the drum around a fulcrum pin (D). A maximum radius of the plug with regard to the pin is lower than nine times the maximum thickness of the spring. A longitudinal adjustment unit (6) is arranged with regard to the direction of the pin between the drum and the driving spring. An independent claim is also included for a clockwork.

Description

Field of the invention

The invention relates to a barrel assembly for mechanical watch with reduced bung diameter.

The invention also relates to a watch movement comprising at least one such barrel assembly.

The invention also relates to a timepiece comprising at least one such movement and / or at least one such barrel assembly.

The invention relates to the field of watchmaking, and more particularly the field of energy storage barrels, for feeding a movement, a ring, or other functionality of a timepiece.

Background of the invention

To increase the power reserve, by increasing the number of turns of a mainspring, a solution consists of a decrease in the diameter of the barrel shaft and the associated bung, so as to increase the available space in the drum for the spring.

The ratio of the bead radius with respect to the thickness of the spring is usually between 10 and 20, and the invention proposes to lower this ratio below 10, and preferably in the range between 5 and 10. and 10.

The sizing should not be done lightly, indeed a risk of breakage exists if the diameter of the plug is too small.

In the conventional architecture of the barrels, a ratchet is mounted axially on a barrel axis or on a bung, via a square, the ratchet being generally fixed by an axial screw. The size of this screw and that of the square thus condition a minimum diameter of a pivoting surface. A shoulder abutting with this pivoting surface limits axial fretting of the shaft or the bung relative to a plate or bridge carrying a stone or the like.

[0009] A diameter even greater than that of this shoulder is necessary for a pivoting guide surface of the drum on the shaft or on the bung, combined with a shoulder for limiting the axial frustum of the drum. The respect of minimal sections of matter implies a quotation chain which results in a large size, difficult to reduce. In particular, it is not enough to reduce all the sizing, because the sections of material are then insufficient to ensure fatigue resistance.

Summary of the invention

Due to these physical limits to the dimensioning of the various components, it is necessary to consider other barrel architectures than the conventional architecture that has just been described.

The invention takes into account several solutions to achieve this reduction of the bung diameter.

An important constraint is to ensure the disassembly of the assembly, for a possible exchange of the mainspring.

The different routes proposed by the invention can be combined with each other, to obtain an optimal result depending on the available space, the position of the ratchet, the presence or absence of a lid for closing the barrel this function can also be assigned to the ratchet.

A first solution is to ensure the exchange between the drum and lid by the mainspring, by transferring to the spring this frolicking adjustment function, in particular by equipping the spring protruding areas, such as dots, larger laminated areas, reported flange, or the like. It is then possible to remove the bearing shoulders of the drum and cover on the barrel shaft or on the bung.

A second solution is to make a bung in several parts, in particular in two or three parts. This solution makes it possible in particular to make a bung of diameter smaller than the pivoting diameter of the drum. Advantageously, the plug is introduced through the bore of the drum. A shaft or a bung in two parts, or more, facilitates the machining of hook of hook of the shell of the mainspring.

The bung may comprise, for driving the ratchet, a conventional square, or a thread. Or, in a non-limiting way, in a second variant.

The bung may also include one or more washers or diameter catch rings for its guidance in platinum and bridge.

Another solution is to chase on the bung a drum-lid drum adjustment washer. This ring is mounted so as to avoid, for intervention on the barrel, any disassembly of a bridge.

Yet another solution is to provide pivoting in the bridges for the drum or / and the cover, instead of performing this pivoting at the barrel shaft or the bung. Advantageously, both the drum and the lid are pivoted in a plate and a bridge.

The various variants provided by the invention provide ease of machining, ease of assembly, ease of disassembly, and control of axial debates between the various components and with respect to the bridges.

In a particular version, the invention relates to a watch barrel assembly, comprising at least one torsion motor spring mounted in torsion between at a first end a barrel drum, and at a second end a receiving surface. which comprises a barrel plug coaxial with said drum about a pivot axis, characterized in that the maximum radius of said bung with respect to said pivot axis is less than nine times the maximum thickness of said spring, and further characterized in that that said barrel assembly comprises, elsewhere than on said bond, means for adjusting the longitudinal frust, in the direction of said pivot axis, between said drum and said mainspring.

According to a feature of the invention, said receiving surface is a surface of revolution relative to said pivot axis.

According to a characteristic of the invention, said surface of revolution consists of a clearance between two ranges, which define said maximum radius of said bung with respect to said pivot axis.

According to a feature of the invention, said clearance is cylindrical and has the same height as said spring which is centered between said bearing surfaces, which are flat and perpendicular to said pivot axis.

According to a feature of the invention, said clearance has a depth corresponding to twice the thickness of said spring.

According to a feature of the invention, said clearance has a height less than that of said spring which is centered obliquely between said bearing surfaces, which comprise oblique faces facing each other so as to define a vee support for singing surfaces; that includes said spring.

According to a feature of the invention, said spring is enclosed in a chamber defined by said drum and a cover, and said barrel assembly comprises, elsewhere than on said leap, means for adjusting the longitudinal swell, according to the direction of said pivot axis, between said cover and said motor spring.

According to a characteristic of the invention, said spring comprises at least one projecting zone arranged to cooperate in support with an internal face of said drum and / or with an inner face of a cover delimiting with said drum a housing chamber of said spring.

According to a feature of the invention, a said projecting zone comprises at least one lug at least one of the edges; that includes said spring.

According to a feature of the invention, a said projecting zone comprises at least one turn extended in height of said spring.

According to a feature of the invention, a said protruding zone comprises at least one flange attached, of height locally higher than that of said spring, and fixed thereto.

According to a feature of the invention, said drum comprises, on its largest inner diameter, a peripheral clearance between two surfaces, for the support and the peripheral holding of said spring.

According to a feature of the invention, said peripheral clearance is cylindrical and has the same height as said spring which is centered between said bearing surfaces, which are flat and perpendicular to said pivot axis.

According to a feature of the invention, said peripheral clearance has a height less than that of said spring which is centered obliquely between said bearing surfaces, which comprise oblique faces facing each other so as to define a vé support for singing surfaces that includes said spring.

According to a feature of the invention, said spring is fixed to said bung by friction.

According to another characteristic of the invention, said spring is welded or brazed to said bung so as to form a monoblock spring-binder subassembly.

The invention also relates to a watch movement comprising at least one such barrel assembly for energy storage with an incorporated input, or by a ratchet integral pivotally of said bond, or by a set of teeth. drum mounted pivotally integral with said drum, and an output constituted respectively, or by a toothing drum mounted integral pivoting said drum, or by a ratchet integral pivotally of said bung.

The invention also relates to a timepiece comprising at least one such watch movement and / or at least one such set for energy storage with an incorporated input, or by a ratchet mounted pivotally mounted of said bung, or by a toothing drum pivotally integral with said drum, and an outlet constituted respectively, or by a toothing of drum mounted integral pivoting said drum, or by a ratchet mounted pivotally integral with said bung .

Brief description of the drawings

Other features and advantages of the invention will appear better on reading the detailed description which follows, with reference to the accompanying drawings, in which: <tb> - fig. 1 <sep> represents, schematically and in section in a plane passing through its pivot axis, a watch cylinder, <tb> - fig. 1A <sep> represents, schematically and in section in a plane passing through its pivot axis, a cylinder according to the invention, <tb> - fig. 1B <sep> represents, schematically and in section in a plane passing through its pivot axis, another variant of the cylinder according to the invention, <tb> - fig. 2 <sep> represents, schematically and in perspective, a barrel plug according to the invention, <tb> - fig. 3 <sep> represents, schematically and in perspective, a bung variant according to the invention, comprising a holding clearance of the mainspring, <tb> - fig. 4 <sep> represents, schematically and in plan view, the plug of FIG. 2 <tb> - figs. 5A, 5B, and 5C <sep> show, schematically, respectively in elevation, in section, and in plan, a bung with a spring mounted by friction, and the end of this spring presented flat, <tb> - figs. 6A, 6B, and 6C <sep> show, schematically, respectively in elevation, in section, and in plan, a bung with another type of spring mounted by friction, and the end of this spring presented flat, <tb> - fig. 7 <sep> shows, schematically, partially, and in section in a plane passing through its pivot axis, a cylinder according to the invention, with a particular arrangement of the bung at the internal receiving surface of the spring, <tb> - fig. 8 <sep> represents, schematically, partially, and in section in a plane passing through its axis of pivoting, in its right part a cylinder according to the invention, with a spring provided with pins according to the invention, and the fig. 8Apresent, flat, a detail of this spring, <tb> - fig. 9 <sep> shows, schematically and in perspective, a spring according to the invention with a locally wider projecting lamination, and FIG. 10show a detail of this spring, <tb> - fig. 11 <sep> shows, schematically and in perspective, a spring according to the invention with a projecting flange projecting, and FIG. 12 shows a detail of this spring, <tb> - fig. 13 <sep> shows, schematically, partially, and in section in a plane passing through its pivot axis, a cylinder according to the invention, with a particular arrangement of the largest diameter of the barrel at the receiving surface external spring, <tb> - fig. 14 <sep> represents, in the form of a block diagram, a clockwork movement comprising a barrel assembly according to the invention, and a timepiece comprising this movement and a barrel assembly according to the invention, <tb> - figs. 15A, 15B, and 15C <sep> represent, in a manner and in perspective, different variants of a bung according to the invention arranged for the welding of the mainspring, <tb> - fig. 16 <sep> represents, in the form of a block diagram, a watch movement comprising a barrel assembly according to the invention, and a timepiece comprising this movement and a barrel assembly according to the invention.

Detailed Description of the Preferred Embodiments

The invention relates to the field of watchmaking, and more particularly the field of energy storage barrels, for feeding a movement, a ring, or other functionality of a timepiece.

More particularly, the invention relates to a mechanical watch cylinder with reduced bung diameter.

In a particular version, the invention relates to a barrel assembly 1 clock, comprising at least one mainspring 2 barrel. This spring 2 is mounted in torsion between, at a first end 21 a barrel drum 3, and at a second end 22 a receiving surface 5 which comprises a barrel plug 4 coaxial with the drum 3 about a pivot axis D.

According to the invention the maximum radius of the bung 4 relative to the pivot axis D is less than nine times the maximum thickness of the spring 2.

And this barrel assembly 1 comprises, other than on the bung 4, means for adjusting the longitudinal bead 6, in the direction of the pivot axis D, between the drum 3 and the spring 2

Figs. 2 and 3 show a bung included in an envelope radius RO about the axis D. The receiving surface 5 comprises a hook 41 for hooking the shell of the spring 2, a clearance 52 allows the attachment of the spring2 and facilitates the machining of the hook 41. Spans 43 and 44 are provided to cooperate with stones mounted in the plates or bridges of the movement receiving the barrel assembly 1. The square 42 is provided for the attachment of a ratchet 12. The 45 and 46 respectively cooperate with a bore 35 of the drum 3 and a bore 75 of the lid 7.

In a particular embodiment, as visible in FIGS. 3, 15A, 15B, 15C, the receiving surface 5 is a surface of revolution with respect to the pivot axis D. Preferably, this receiving surface is a contact surface for fixing the spring 2 by welding on the bonde 4, by a point 53, or along a segment, preferably parallel to the pivot axis D, passing through such a point 53, as visible in FIGS. 15A, 15B, 15C.

In the case of FIG. 15Ale spring 2 bears at point 53 on a cylindrical portion of the bung 4 of small width. In the case of FIG. 15B the spring 2 bears at the point 53 on a flat tangent to one of the bearing surfaces 45 or 46 of the drum 3 or the cover 7, here preferably to the bearing 45 intended to cooperate with the bore 35 of the drum 3 Fig. 15C illustrates a cylindrical bearing surface of the spring 2 wider than that of FIG. 15A, and which is locally confused with one of the bearing surfaces 45 or 46 for guiding the drum 3 or the cover 7, here preferably with the bearing surface 45 intended to cooperate with the bore 35 of the drum 3.

In a particular embodiment, as visible in FIG. 3, the surface of revolution 5 is constituted by a clearance 8 of height h between two bearing surfaces 91, 92, belonging to flanges 47 and 48. These bearing surfaces 91 and 92 define the maximum radius of the bung 4 with respect to the axis Preferably, this clearance 8 is cylindrical and at the same height as the spring 2 which is centered between the bearing surfaces 91, 92 which are flat and perpendicular to the pivot axis D.

Advantageously, the clearance 8 has a depth P corresponding to twice the thickness of the spring 2.

In another variant illustrated in Figure 7, the clearance 8 has a height h less than that of the spring 2 which is centered obliquely between the bearing surfaces 91, 92, an upper flange 47 and a flange lower 48. These bearing surfaces 91 and 92 have oblique faces, inclined at an angle, facing each other so as to define a support v for the edge surfaces 27 and 28 that comprises the spring 2 .

In a preferred embodiment, as shown in FIGS. 1A and 1B, the spring 2 is enclosed in a chamber 32 defined by the drum 3 and a cover 7, and the barrel assembly 1 according to the invention comprises, other than on the bung 4, adjustment means of the longitudinal edging 6, in the direction of the pivot axis D, between the cover 7 and the spring 2.

FIG. 1B illustrates an embodiment in which the drum has a shoulder 3A facing the spring 2, and can abut by a bearing surface 3B on a bearing surface 4B that includes the bung 4, and wherein the lid 7 has a shoulder 7A turned towards the spring 2, and can be supported by a bearing surface 7B on a bearing surface 4C that includes the bung 4.

As visible in FIGS. 8 and 8A, the spring 2 advantageously comprises at least one projecting zone 23 arranged to cooperate in abutment with an inner face 31 of the drum 3 and / or with an internal face 71 of a cover 7 delimiting with the drum 3 a housing chamber 32 of the spring 2.

As visible in FIG. 8A, in a first variant, such a protruding zone 23 comprises at least one lug 24 at the level of at least one of the edges 27; 28 This spring region 23 is arranged to cooperate with an inner surface 31 of the drum 3, and / or with an inner surface 71 of the cover 7, and preferably with both.

In another variant visible in FIG. 9 or 10, such a protruding zone 23 comprises at least one turn extended in height of the spring 2.

In yet another variant, visible in FIGS. 11 and 12, such a protruding zone 23 comprises at least one attached flange 26, locally higher than that of the spring 2, and fixed to the latter, for example by welding.

In the particular embodiment of FIG. 13, the drum 3 comprises, on its largest inside diameter, a peripheral clearance 36 between two upper and lower flanges 37 and 38, the edges of which, upper 27 and lower 28, respectively carry two bearing surfaces 33 and 34, oblique at an angle α , for the support and the peripheral maintenance of the spring 2.

The combination of the embodiments of FIGS. 7 and 13is easy to achieve and ensures a good retention of the spring 2. In the preferred case where it has a projecting zone 23, it is at a fixed dimension relative to the drum 3 or / and the cover 7, which guarantees a perfect adjustment of the game.

Alternatively, the peripheral clearance 36 is cylindrical and has the same height as the spring 2 which is centered between the bearing surfaces 33, 34, which are flat and perpendicular to the pivot axis D.

In this variant, as illustrated, the peripheral clearance 36 has a height less than that of the spring 2, which is centered obliquely between the bearing surfaces 33 and 34 which comprise oblique faces facing one towards the other so as to define a support v for singing surfaces 27; 28 that includes the spring 2.

As visible in particular, but in a non-limiting manner in FIGS. 5A, 5B, 5C, 6A, 6B, 6C, the barrel assembly 1 comprises a spring 2 which is fixed to the bung 4 by friction, the end of the spring 2 then preferably comprises a shoulder designed to hold in abutment the free end of the spring 2 during its winding ..

In other embodiments, the spring 2 is welded or brazed to the bung 4 so as to form a monoblock spring-binder subassembly. This embodiment is particularly advantageous, economical, and a very easy assembly.

The invention also relates to a watch movement 100 comprising at least one such barrel assembly 1 for storing energy with an incorporated input, or by a ratchet 12 mounted pivotally connected to the bung 4, or by a toothing drum 13 mounted pivotally integral with the drum 3, and an outlet respectively constituted by either a toothing drum 13 mounted pivotally integral with the drum 3, or by a ratchet 12 mounted pivotally integral with the bung 4 .

The invention also relates to a timepiece 1000 comprising at least one such watch movement 100 and / or at least one such barrel assembly for energy storage with an incorporated input, or by a ratchet 12 mounted pivotally mounted on the bung 4, or by a toothing drum 13 mounted pivotally integral with the drum 3, and an outlet constituted respectively, or by a toothing drum 13 mounted pivotally integral with the drum 3, or by a ratchet 12 mounted pivotally integral with the bung 4.

Claims (18)

1. Barrel assembly (1) timepiece, comprising at least one mainspring (2) mounted torsionally between, at a first end (21) a drum (3) barrel, and at a second end (22) a receiving surface (5) which comprises a barrel plug (4) coaxial with said drum (3) about a pivot axis (D), characterized in that the maximum radius of said bung (4) with respect to said axis of pivoting (D) is less than nine times the maximum thickness of said spring (2), and further characterized in that said barrel assembly (1) comprises, other than on said bung (4), adjustment means of longitudinal edging (6), in the direction of said pivot axis (D), between said drum (3) and said motor spring (2). 2. barrel assembly (1) according to claim 1, characterized in that said receiving surface (5) is a surface of revolution relative to said pivot axis (D). 3. barrel assembly (1) according to claim 2, characterized in that said surface of revolution (5) is constituted by a clearance (8) between two surfaces (91, 92) which define said maximum radius of said bung (4). ) with respect to said pivot axis (D). 4. barrel assembly (1) according to claim 3, characterized in that said clearance (8) is cylindrical and at the same height as said spring (2) which is centered between said surfaces (91, 92) which are flat and perpendicular said pivot axis (D). 5. barrel assembly (1) according to claim 4, characterized in that said clearance (8) has a depth corresponding to twice the thickness of said spring (2). 6. Barrel assembly (1) according to claim 3, characterized in that said clearance (8) has a height less than that of said spring (2) which is centered obliquely between said bearing surfaces (91, 92) which have faces oblique turned towards each other so as to define a support v for singing surfaces (27; 28) that comprises said spring (2). 7. barrel assembly (1) according to one of the preceding claims, characterized in that said spring (2) is enclosed in a chamber (32) defined by said drum (3) and a cover (7), and further characterized in what said barrel assembly (1) comprises, other than on said bung (4), means for adjusting the longitudinal gap (6), in the direction of said pivot axis (D), between said cover (7) and said spring (2) motor. Barrel assembly (1) according to one of the preceding claims, characterized in that said spring (2) comprises at least one projecting zone (23) arranged to cooperate in abutment with an inner face (31) of said drum (3). or / and with an inner face (71) of a lid (7) delimiting with said drum (3) a chamber (32) for accommodating said spring (2). 9. barrel assembly (1) according to claim 8, characterized in that a said projecting zone (23) comprises at least one lug (24) at least one of the edges (27; 28) that comprises said spring ( 2). 10. Barrel assembly (1) according to claim 8, characterized in that a said projecting zone (23) comprises at least one turn extended in height of said spring (2). 11. A barrel assembly (1) according to claim 8, characterized in that a said protruding zone (23) comprises at least one attached flange (26), locally higher than that of said spring (2), and fixed to the latter . 12. A barrel assembly (1) according to one of the preceding claims, characterized in that said drum (3) has, on its largest inner diameter, a peripheral clearance (36) between two surfaces (33; 34) for l supporting and maintaining peripheral said spring (2). 13. Barrel assembly (1) according to claim 12, characterized in that said peripheral clearance (36) is cylindrical and at the same height as said spring (2) which is centered between said bearing surfaces (33; 34) which are flat and perpendicular to said pivot axis (D). 14. barrel assembly (1) according to claim 12, characterized in that said peripheral clearance (36) has a height less than that of said spring (2) which is centered obliquely between said bearing surfaces (33; 34) which comprise oblique faces facing each other so as to define a support v for edge surfaces (27; 28) that comprises said spring (2). 15. Barrel assembly (1) according to one of the preceding claims, characterized in that said spring (2) is fixed to said bung (4) by friction. 16. A barrel assembly (1) according to one of claims 1 to 14, characterized in that said spring (2) is welded or brazed to said bung (4) so as to form a monoblock spring-binder subassembly. 17. Watchmaking movement (100) comprising at least one barrel assembly (1) according to one of the preceding claims for storing energy with an incorporated inlet, or by a ratchet (12) pivotably mounted on said bung (4), or by a toothing drum (13) mounted pivotally integral with said drum (3), and an outlet constituted respectively, or by a toothing drum (13) mounted pivotally integral with said drum (3) or by a ratchet (12) pivotally mounted on said bung (4). 18. Timepiece (1000) comprising at least one watch movement (100) according to claim 17 and / or at least one barrel assembly (1) according to one of claims 1 to 16 for energy storage. with an inlet constituted by either a ratchet (12) pivotably mounted to said bung (4) or by a toothing of drum (13) pivotably mounted to said drum (3) and an outlet respectively constituted by or by a toothing drum (13) mounted pivotally integral with said drum (3), or by a ratchet (12) mounted integral pivotally of said bung (4).