CH705488B1 - Together watch barrel bung reduced diameter. - Google Patents

Abstract

The invention relates to a watch cylinder assembly (1), comprising a motor spring (2) torsionally mounted between a drum (3) and a receiving surface (5) which comprises a plug (4) coaxial with said drum (3). ) about an axis (D). Said bung (4) comprises successively, from a first (86), to a second end (87): means for fixing a ratchet, and / or a first pivoting surface in a plate, a third bearing (43) pivoting said drum (3), a flange (40) projecting from said third bearing surface (43), pressing an inner face (31) of said drum (3) towards said spring (2), radially recessed relative to said flange (40), said receiving surface (5), recessed radially with respect to the latter, a fourth bearing surface (44) for pivoting a lid (7) for closing said barrel (1), a second bearing surface pivoting (182) in a platen.

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 dimensioning 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.

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

The invention proposes to set up a solution allowing a significant decrease in bung diameter compared to the prior art.

For this purpose, the invention relates to a watch barrel assembly, comprising at least one barrel drive spring mounted between at a first end a barrel drum, and at a second end a receiving surface that 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 ten times the maximum thickness of said spring, further characterized in that said bung comprises successively, from a first end, towards a second end: means for fixing a ratchet, and / or a first pivoting surface in a plate or a bridge of a clock mechanism, then a pivoting surface with respect to a bore of said drum, then a flange projecting radially relative to said bearing surface and cooperating in abutment with an internal face that comprises said drum on the side of said at least one spring, then, flush or recessed radially with respect to said flange, said receiving surface of said at least one spring, then, radially recessed with respect to said receiving surface, a pivoting surface with respect to a bore of a cover arranged to constitute with said drum a chamber containing said at least one mainspring, then a second pivoting range in a plate or bridge of said clock mechanism.

According to one embodiment of the invention, the outer diameter of said bung is degressive stepwise from said flange to said second end.

According to one embodiment of the invention, the outer diameter of said bung is degressive stepwise from said flange to said first end.

According to one embodiment of the invention, said scope is the range of larger diameter after said flange.

According to one embodiment of the invention, said barrel assembly comprises means for supporting an extraction tool arranged to allow the axial extraction of said bung, along said pivot axis, by the exercise. a thrust or traction force on said bung.

According to one embodiment of the invention, said support means of an extraction tool are constituted by at least one groove and / or a shoulder that comprises said bung in the vicinity of said second end and beyond said range.

According to one embodiment of the invention, said bung is made of at least two parts, the first portion of diameter less than the smallest of the two diameters of said bore of said drum and said bore of a lid, and the other substantially tubular second portion having a bore driven on said first portion and which second portion, or comprises said receiving surface of said mainspring, or constitutes the inner end of said mainspring.

According to one embodiment of the invention, said bung is made in at least two parts, the first said inner portion comprising said means for fixing a ratchet or constituting said ratchet, and comprising said first scope of pivoting, said first portion having a centering surface and a thread, respectively a tapping, according to said pivot axis, and the other substantially tubular second portion having a centering bore fitted on said centering surface, and having a tapping, respectively a thread, complementary to said thread, respectively tapping, of said first part, said second part carrying said bearing surface of said flange, said second part also carrying said receiving surface of said mainspring or constituting the inner end of said spring motor, and said second part still carrying said span, and said second pivoting range.

According to one embodiment of the invention, said bung is made of at least two parts, the first part comprising a cylindrical or tubular barrel shaft and having at its two opposite axial ends said first pivoting surface and said second pivoting surface, which are either monobloc indémontable with said barrel shaft or reported thereon by screwing, and the other second part which carries said bearing surface and said flange, said second part also comprising said receiving surface of said motor spring or constituting the inner end of said motor spring, and said second portion still carrying said fourth range, said second portion having a bore driven on said first portion.

According to one embodiment of the invention, said first part is made unbreakable monobloc with a ratchet holder or with a said ratchet.

According to one embodiment of the invention, said second part comprises pivoting drive means of said first portion and / or a said ratchet arranged to cooperate with complementary drive means that includes said first portion or said ratchet, and to provide both a pivotal contact that a contact in the axial direction of said pivot axis.

According to one embodiment of the invention, said second part is itself composed of several coaxial parts, one of which is in the form of a ring and carries a catch hook of a shell that includes said less a spring.

According to one embodiment of the invention, said receiving surface carries a catch hook of a shell that comprises said at least one spring, and said collar comprises a notch clearance of the hook machining tools. .

According to one embodiment of the invention, said ratchet is integral with said bung unbreakable.

According to one embodiment of the invention, said receiving surface is a surface of revolution with respect to said pivot axis.

According to one embodiment of the invention, said spring is fixed to said bung by friction.

According to one embodiment of the invention, said spring is welded or brazed to said bung so as to form a subassembly bung-spring unbreakable monobloc.

The invention further relates to a movement comprising at least one such barrel assembly for energy storage with an incorporated inlet, or by a ratchet integral pivotally of said bung or a barrel shaft integral with said bonde, or by a toothing of drum mounted integral pivotally of said drum, and an output constituted respectively, or by a toothing of drum mounted integral pivoting said drum, or by a ratchet mounted pivotally integral with said bung or said barrel tree.

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

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 according to the invention, with a bung having a flange cooperating with an inner surface of a barrel drum, <tb> fig. 2 <SEP> is a variant of FIG. 1, with pivoting of the plug in a plate beyond the barrel drum, <tb> fig. 3 <SEP> is a variant of the cylinder according to the invention, wherein the flange also constitutes the receiving surface of the mainspring, and is made in two parts, one axial carries a ratchet, <tb> fig. 4 <SEP> is a variant of the barrel according to the invention, with a bung made in three coaxial parts, two of which at the pivot axis of the barrel, <tb> fig. 5 <SEP> is a variant of the barrel according to the invention, with a bung made in four coaxial parts, two of which at the pivot axis of the barrel, and a tubular portion carrying an outer portion carrying a hook of hooking of the mainspring spring, <tb> fig. 6 <SEP> is a variant of the barrel according to the invention, with a bung made in two coaxial parts, including a cylindrical at the pivot axis of the barrel, and an outer portion carrying a collar and a snap hook of the mainspring, <tb> figs. 7 to 9 <SEP> illustrate, FIG. 8 being seen along the pivot axis and FIGS. 7 and 9 in section along this axis, a variant of the barrel according to the invention, with means for pivoting a bearing portion of a ratchet, <tb> fig. <SEP> represents a variant of the barrel according to the invention, with a main part of the bung carrying a flange, and an outer ring carrying a catch hook of the mainspring, <tb> fig. 11 <SEP> represents, in plan view, an unbreakable monoblock bung flange and hook and whose collar comprises a notch clearance of hook machining tools, <tb> fig. 12 <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 to the field of energy storage barrels, for feeding a movement, a ring, or another feature of a timepiece.

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

The invention relates to a barrel 1 watch assembly, comprising a mainspring 2 of the 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.

The maximum radius of the plug 4 with respect to the pivot axis D is less than ten times the maximum thickness of the spring 2, and preferably less than eight times this thickness, thanks to the arrangements described below.

The bung 4 comprises successively, from a first end 86, towards a second end 87: fastening means 120 of a ratchet 12, and / or a first pivoting surface 181 in a plate 10 or a bridge of a clock mechanism, then a third pivoting surface 43 with respect to a bore 35 of the drum 3, then a flange 40 protruding radially from the third bearing surface 43 and cooperating in abutment with an inner face 31 that the drum 3 has on the side of the at least one spring 2, then, flush with or retracted radially from the flange 40, the receiving surface 5 of the at least one spring 2, then, radially recessed with respect to the receiving surface 5, a fourth pivoting surface 44 with respect to a bore 75 of a cover 7 arranged to constitute with the drum 3 a chamber 32 containing the at least one driving spring 2, then a second pivoting surface 182 in a plate or a bridge of the clock mechanism.

In the embodiment of FIG. 1, the outer diameter of the plug 4 is gradually decreasing from the flange 40 to the second end 87.

In an exemplary embodiment as visible in FIG. 2, the outer diameter of the plug 4 is gradually decreasing from the flange 40 to the first end 86.

As visible in FIG. 1, in a particular variant, the third span 43 constitutes the range of larger diameter after the collar 40.

Advantageously, the barrel assembly 1 comprises support means of an extraction tool 190, which are arranged to allow the axial extraction of the bung 4, along the pivot axis D, by the exercising a thrust or pulling force on the bung 4.

In figs. 4 and 5, in a non-limiting embodiment, these support means of an extraction tool 190 are constituted by at least one groove 191 and / or a shoulder that comprises the bung 4 near the second end 87 and the fourth range 44.

Preferably, the spring 2 is enclosed in a chamber 32 defined by the drum 3 and a cover 7 fixed on the drum 3, and the bung 4 comprises a second outer shaft portion 44 on which a lower bore 75 of the lid 7.

In a variant illustrated in FIG. 6, the plug 4 is made of at least two parts, the first part 4A of smaller diameter than the smaller of the two diameters of the bore 35 of the drum 3 and the bore 75 of a cover 7, and the other part 2 4B substantially tubular having a bore driven on the first part 4A. This second part 4B, either comprises the receiving surface 5 of the mainspring 2, or constitutes the inner end of the mainspring 2.

In the variant illustrated in FIG. 3, the bung 4 is made of at least two parts. The first inner part 4A comprises the fixing means 120 of a ratchet 12 or constitutes the ratchet 12, and comprises the first pivoting surface 181. This first part 4A comprises a centering surface 183 and a threading 185, respectively a tapping, according to the pivot axis D.

The other substantially tubular second portion 4B comprises a centering bore 184 fitted on the centering surface 183, and comprises a tapping 186, respectively a thread, complementary to the thread 185, respectively tapping, of the first part 4A. This second part 4B is carrying the third seat 43, the flange 40, the receiving surface 5 of the mainspring 2 or constitutes the inner end of the driving spring 2, and is still carrying the fourth seat 44, and the second pivoting surface 182.

In another variant, the bung 4 is made of at least two parts, the first part 4A comprising a cylindrical or tubular barrel shaft 18 and having at its two opposite axial ends the first pivoting surface 181 and the second pivoting surface 182, which are either monobloc indémontable with the barrel shaft or reported on the latter by screwing and / or hooping and / or welding. The other second part 4B carries the third seat 43, the flange 40, comprises the receiving surface 5 of the mainspring 2 or constitutes the inner end of the driving spring 2, and still carries the fourth seat 44. This second part 4B having a bore driven on the first portion 4A.

Advantageously, the first part 4A is made unbreakable monobloc with a ratchet holder 81 or with a ratchet 12.

As can be seen in FIGS. 7 to 9, the second portion 4B advantageously comprises drive means 187 pivoting the first portion 4A and / or a ratchet 12 arranged to cooperate with complementary drive means 188 that includes the first portion 4A or the ratchet 12, and to ensure both a pivotal contact that a contact in the axial direction of the pivot axis D. In the case of the figures, a clearance 188 made in the ratchet 12 by a drill string cooperates with a profile 187 with two milled plates at the end of the bung.

In the advantageous embodiment in terms of machining costs of FIG. 10, the second part 4B itself consists of several coaxial parts, one of which is in the form of a ring and carries a hook 41 for hooking a shell which comprises the at least one spring 2.

As visible in FIG. 11, in an integral unbreakable embodiment, the receiving surface 5 carries a hook 41 for hooking a shell that includes the at least one spring 2, and the bung 4 comprises, at right hook 41, and particularly at the level of the flange 40, a clearance 52 for the passage of a cutter or a drill string for machining the hook 41.

In a variant of the invention, the ratchet 12 is integral with the bung 4 indémontable.

In a variant of the invention, the receiving surface 5 is a surface of revolution with respect to the pivot axis D.

In a variant of the invention, the spring 2 is fixed to the bung 4 by friction.

In a variant of the invention, the spring 2 is welded or soldered to the bung 4 so as to form a subassembly bung-spring unbreakable monoblock.

The invention also relates to a watch movement 100 comprising at least one such barrel assembly 1 for energy storage with an incorporated input, or by a ratchet 12 mounted integral pivoting of the bung 4 or a barrel shaft 18 integral with the bung 4, or by a toothing drum 13 pivotally integral with the drum 3, and an outlet formed respectively, or by a toothing drum 13 pivotally integral with the drum 3, or by a ratchet 12 mounted pivotally integral with the bung 4 or the barrel shaft 18.

The invention also relates to a timepiece 1000 comprising at least one such watch movement 100 and / or at least one such barrel assembly 1 for energy storage with an incorporated entrance, or by a ratchet 12 pivotally mounted to the bung 4 or a barrel shaft 18 integral with the bung 4, or by a toothing drum 13 pivotally integral with the drum 3, and an output constituted respectively, or by a set of teeth drum 13 integral in pivoting drum 3, or by a ratchet 12 mounted pivotally integral with the bung 4 or the barrel shaft 18.

Claims (19)

1. barrel assembly (1) timepiece, comprising at least one mainspring (2) mounted between barrel, at a first end (21) a drum (3) barrel, and at a second end (22) a surface receiving device (5) comprising a barrel plug (4), coaxial with said drum (3) about a pivot axis (D), characterized in that the maximum radius of said plug (4) with respect to said axis of rotation pivoting (D) is less than ten times the maximum thickness of said spring (2), further characterized in that said bung (4) comprises successively, from a first end (86), towards a second end (87): Means (120) for fastening a ratchet (12) and / or a first pivoting surface (181) in a plate (10) or a bridge of a clock mechanism, - then a third bearing surface (43) with respect to a bore (35) of said drum (3), - Then a flange (40) protruding radially from said third bearing surface (43) and cooperating in abutment with an inner face (31) that comprises said drum (3) on the side of said at least one spring (2), - Then, flush or recessed radially relative to said flange (40), said receiving surface (5) of said at least one spring (2), - then, radially recessed with respect to said receiving surface (5), a fourth bearing surface (44) pivoting with respect to a bore (75) of a cover (7) arranged to constitute with said drum (3) a chamber (32) containing said at least one mainspring (2), And then a second pivoting surface (182) in a plate or a bridge of said clock mechanism. 2. Barrel assembly (1) according to the preceding claim, characterized in that the outer diameter of said bung (4) is degressive stepwise from said flange (40) to said second end (87). 3. Barrel assembly (1) according to one of the preceding claims, characterized in that the outer diameter of said bung (4) is degressive stepwise from said flange (40) to said first end (86). 4. Barrel assembly (1) according to one of the preceding claims, characterized in that said third span (43) is the range of larger diameter after said flange (40). 5. A barrel assembly (1) according to one of the preceding claims, characterized in that it comprises means for supporting an extraction tool (190) arranged to allow the axial extraction of said plug (4) along said pivot axis (D) by exerting a thrust or pulling force on said bung (4). 6. barrel assembly (1) according to the preceding claim, characterized in that said support means of an extraction tool (190) are constituted by at least one groove (191) and / or a shoulder that includes said bung (4) near said second end (87) and beyond said fourth span (44). 7. A barrel assembly (1) according to one of the preceding claims, characterized in that said plug (4) is made in at least two parts, the first portion (4A) of smaller diameter than the smaller of the two diameters of said boring (35) of said drum (3) and said bore (75) of a cover (7), and the other substantially tubular second portion (4B) having a bore driven on said first portion (4A) and which second portion (4A) 4B), or comprises said receiving surface (5) of said motor spring (2), or constitutes the inner end of said motor spring (2). Barrel assembly (1) according to one of claims 1 to 6, characterized in that said bung (4) is made in at least two parts, the first part (4A) said inner having said fixing means ( 120) of said ratchet (12) or constituting said ratchet (12), and having said first pivoting surface (181), said first portion (4A) having a centering surface (183) and a thread (185), respectively a tapping along said pivot axis (D) and the other substantially tubular second portion (4B) having a centering bore (184) fitted to said centering surface (183) and having a thread (186), respectively a thread , complementary to said thread (185), respectively tapping, of said first portion (4A), said second portion (4B) bearing said third bearing surface (43), said collar (40), said second portion (4B) being also carrier of said reception surface tion (5) of said motor spring (2) or constituting the inner end of said motor spring (2), and said second part (4B) still carrying said fourth bearing surface (44), and said second pivoting surface ( 182). 9. Barrel assembly (1) according to one of claims 1 to 6, characterized in that said plug (4) is made of at least two parts, the first portion (4A) having a barrel shaft (18) cylindrical or tubular and having at its two opposite axial ends said first pivoting surface (181) and said second pivoting surface (182), which are either monoblock indémontable with said barrel shaft or reported thereon by screwing, and the other second portion (4B) carrying said third seat (43) and said collar (40), said second portion (4B) also comprising said receiving surface (5) of said driving spring (2) or constituting the end internal of said motor spring (2), and said second portion (4B) still carrying said fourth bearing surface (44), said second portion (4B) having a bore driven on said first portion (4A) 10. Barrel assembly (1) according to the preceding claim, characterized in that said first portion (4A) is made integral piece, or with a ratchet holder (81) constituting said fixing means (120) of said ratchet (12). or with said ratchet (12). 11. A barrel assembly (1) according to claim 9 or 10, characterized in that said second portion (4B) comprises drive means (187) pivoting said first portion (4A) and / or a said ratchet (12) arranged to cooperate with complementary drive means (188) that includes said first portion (4A) or said ratchet (12), and to provide both a pivotal contact and a contact in the axial direction of said axis pivoting (D). 12. Barrel assembly (1) according to one of claims 7 to 11, characterized in that said second portion (4B) itself consists of several coaxial parts, one of which is in the form of ring and carries a hook (41) hooking a shell that comprises said at least one spring (2). 13. barrel assembly (1) according to one of claims 1 to 11, characterized in that said receiving surface (5) carries a hook (41) for hooking a shell that comprises said at least one spring (2 ), and that said flange (40) has a recess (52) for clearing the machining tools of the hook. 14. A barrel assembly (1) according to one of the preceding claims, characterized in that said ratchet (12) is integral with said unobtrusive plug (4). 15. Barrel assembly (1) according to one of the preceding claims, characterized in that said receiving surface (5) is a surface of revolution relative to said pivot axis (D). Barrel assembly (1) according to one of the preceding claims, characterized in that said spring (2) is fixed to said bung (4) by friction. 17. A barrel assembly (1) according to one of claims 1 to 15, characterized in that said spring (2) is welded or brazed to said bung (4) so as to form a subassembly bung-spring unbreakable monobloc. 18. Watchmaking movement (100) comprising at least one barrel assembly (1) according to one of the preceding claims for energy storage with an incorporated inlet, or by said ratchet (12) pivotably mounted to said bung (4) or a barrel shaft (18) integral with said bung (4), or by a toothing drum (13) pivotally integral with said drum (3), and an output constituted respectively, or by a toothing drum (13) pivotally integral with said drum (3), or by said ratchet (12) mounted pivotally integral with said bung (4) or said barrel shaft (18). 19. Timepiece (1000) comprising at least one watch movement (100) according to claim 18 and / or at least one barrel assembly (1) according to one of claims 1 to 17 for energy storage. with an inlet constituted, or by said ratchet (12) pivotally mounted to said bung (4) or a barrel shaft (18) integral with said bung (4), or by a toothing drum (13). ) integral in pivoting of said drum (3), and an output constituted respectively, or by a toothing drum (13) pivotally integral with said drum (3), or by said ratchet (12) mounted pivotally attached to said bung (4) or said barrel shaft (18).