CH705489B1 - Together watch barrel bung reduced diameter. - Google Patents

Abstract

The invention relates to a barrel assembly (1) comprising a spring (2) mounted between a drum (3) and a plug (4) coaxial with a shaft (18) around a pivot axis (D). Said shaft (18) extends between a first end (86) having an end shoulder (85) and a second end (87) having a bearing surface (84) driven into a bore (411) of said bung (4) according to said axis (D). Said bung (4) has a first outer shaft portion (43) on which a bore (35) of said drum (3) slides, and said shaft (18) has between said end shoulder (85) and said bearing (84). , a ratchet carrier (81) having a bearing for driving a ratchet (12), which ratchet carrier (81) limits, directly or indirectly, the frust of said drum (3) with respect to a face of support (43A) of said bung (4) at the edge of the receiving surface (5) of a spring (2).

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, and coaxial with a barrel shaft, characterized in that the maximum radius of said plug with respect to said pivot axis is less than ten times the maximum thickness of said spring , further characterized in that said barrel shaft extends between a first end having an end shoulder and a second end having a bearing which is forced out in a bore that comprises said bung along said pivot axis, further characterized in said bung comprises a first upper outer shaft portion on which a bore of said drum slides, and further characteristics erected in that said barrel shaft comprises, between said end shoulder and said bearing, a ratchet holder having a bearing for driving a ratchet, which ratchet holder limiting, directly or indirectly, the fretting of said drum by relative to a bearing face that includes said bung on the edge of said receiving surface.

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

According to one embodiment of the invention, said spring is enclosed in a chamber defined by said drum and a lid fixed on said drum, and said bung comprises a second outer lower shaft portion on which slides a bore of said lid.

According to one embodiment of the invention, said barrel shaft and said bung trap, with a functional game, a movable support ring on said scope, between, on the one hand and a first side of said ring, or a first shoulder that comprises said barrel shaft, or said ratchet holder, and secondly and a second side of said support ring opposite said first side and arranged to bear on a first end face that includes said bung, the side opposite to a second end face of said bung, which second end face defining, with said end shoulder of said barrel shaft, a functional spacing of said barrel assembly between bearings in which it pivots at pivots at its said first end and said second end.

According to one embodiment of the invention, said barrel shaft comprises, between said end shoulder and said bearing, and externally to a housing formed to receive said support ring, a ratchet holder arranged to receive a ratchet chased on a range that includes said ratchet holder.

According to one embodiment of the invention, said ratchet holder comprises at least one notch in the immediate vicinity of said first shoulder and partially superimposed on said support ring to allow the exercise of a thrust on said ring. support for its disassembly using a tool introduced by said notch (82).

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 bung is made in two parts, a first tubular portion arranged to cooperate with said barrel shaft and having at its two opposite axial ends said first end face and said second end face, and whose outer diameter of said tubular portion constitutes a first outer shaft portion arranged to form a pivot of a bore of said drum, and the other second substantially tubular portion having a bore driven on said first outer shaft portion. and which second part, or comprises said receiving surface of said mainspring, or constitutes the inner end of said mainspring.

According to one embodiment of the invention, said functional clearance is between 0.04 mm and 0.08 mm.

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 also 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 by a fixed drum toothing in pivoting of said drum, and an output constituted respectively, or by a toothing of drum mounted integral pivotally of 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 barrel assembly for energy storage with an incorporated input, or by a ratchet mounted integral with pivoting of said bung or by a toothing of drum mounted pivotally integral with said drum, and an output constituted respectively, or by a toothing of drum mounted pivotally integral with said drum, or by a ratchet mounted pivotally attached to said bung .

Brief description of the drawings

Other embodiments 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> shows, schematically and in section in a plane passing through its pivot axis, a watch cylinder according to the invention, with a bung mounted on a barrel shaft, <tb> fig. 2 <SEP> is a detail of the central part of FIG. 1, <tb> fig. 3 <SEP> is a top view, partial, of the barrel assembly of FIG. 1, <tb> fig. 4 <SEP> is a variant of the barrel of FIG. 1, with a bung itself made in two coaxial parts and mounted on a barrel shaft, <tb> fig. <SEP> represents, similarly to FIG. 2, another variant of the cylinder according to the invention, with a ratchet holder located under the bridge, and support means for the bung extraction tool, and <tb> fig. 6 <SEP> is a variant of this same barrel with interposition of a wedge washer between the bung and the barrel shaft, <tb> fig. 7 <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.

The invention relates to a barrel assembly 1 clock, comprising at least one mainspring 2 barrel. This spring 2 is mounted 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.

This bung 4 is coaxial with a barrel shaft 18.

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

In the version illustrated in FIG. 1, the barrel shaft 18 extends between a first end 86 having a butt end 85 and a second end 87 having a bearing surface 84, which is forced out in a bore 411 which the bung 4 comprises along the axis pivoting D.

The bung 4 comprises a first upper outer shaft portion 43 on which slides a bore 35 of the drum 3.

The barrel shaft 18 comprises, between the end shoulder 85 and the bearing 84, a ratchet holder 81 having a bearing for driving a ratchet 12. This ratchet holder 81 limits, directly or indirectly , the frolicking of the drum 3 with respect to a support face 43A that includes the bung 4 at the edge of the receiving surface 5.

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

As illustrated, 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 lower outer shaft portion 44 on which slides a bore 75 cover 7.

According to the invention, as shown in FIGS. 1, 2 and 3, the barrel shaft 18 and the plug 4 trap, with a functional clearance J, a bearing ring 19 movable on the bearing surface 84, between, on the one hand and a first side 191 of the ring 19, or a first shoulder 83 that includes the barrel shaft 18, or the ratchet holder 81, and secondly and a second side 192 of the support ring 19 opposite the first side 191. This second side 192 is arranged to bear on a first end face 49 that includes the bung 4, the opposite side to a second end face 49A of the bung 4. This second end face 49A defines, with the end shoulder 85 of the barrel shaft 18, a functional center distance E of the barrel assembly 1, between bearings in which it pivots at pivots at its first end 86 and its second end 87.

[0038] Preferably, the functional clearance J is between 0.04 mm and 0.08 mm.

In this version, the barrel shaft 18 comprises, between the end shoulder 85 and the bearing surface 84, and externally to a housing formed to receive the bearing ring 19, a ratchet holder 81 arranged to receive a ratchet 12 driven on a range that includes the ratchet holder 81.

This ratchet holder 81 comprises at least one notch 82 in the immediate vicinity of the first shoulder 83 and partially superimposed on the support ring 19 to allow the exercise of a thrust on the support ring 19 for disassembly using a tool introduced by the notch 82, thus constituting the support means for extraction tool 190.

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

In the variant of FIG. 4, the bung 4 is made in two parts, the first tubular portion 4A arranged to cooperate with the barrel shaft 18, and having at its two opposite axial ends the first end face 49 and the second end face 49A . The outer diameter of the tubular portion 4A constitutes a first outer shaft portion 43 arranged to constitute a pivot of a bore 35 of the drum 3, and the other substantially tubular second portion 4B comprises a bore driven on the first outer shaft portion 43. This second part 4B, either comprises the receiving surface 5 of the mainspring 2, or constitutes the inner end of the mainspring 2.

FIG. 5 illustrates, similarly to FIG. 2, another variant of the cylinder according to the invention, with a ratchet holder 81 located below the bridge, and support means for binder extraction tool 190 constituted here by a groove 190A.

FIG. 6 is a variant of the same cylinder with the interposition of a washer 193 wedging between the bung and the barrel shaft.

In a variant not shown, the spring 2 is fixed to the bung 4 by friction.

Advantageously, the spring 2 is welded or soldered to the bung 4 so as to form a subassembly bung-spring unbreakable monobloc.

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

Claims (14)

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) which comprises a barrel plug (4), coaxial with said drum (3) about a pivot axis (D), and coaxial with a barrel shaft (18), characterized in that the maximum radius said bung (4) with respect to said pivot axis (D) is less than ten times the maximum thickness of said spring (2), further characterized in that said barrel shaft (18) extends between a first end ( 86) having an end shoulder (85) and a second end (87) having a bearing surface (84) which is force-driven into a bore (411) which said bung (4) comprises along said pivot axis (D), further characterized in that said bung (4) has a first upper outer (43) outer stem portion on the slidable a bore (35) of said drum (3), and further characterized in that said barrel shaft (18) has, between said end shoulder (85) and said seat (84), a ratchet holder (81) having a bearing for driving a ratchet (12), which ratchet carrier (81) limiting, directly or indirectly, the start of said drum (3) relative to a bearing face (43A) that includes said bung (4) bordering said receiving surface (5). 2. Barrel assembly (1) according to the preceding claim, characterized in that it comprises extraction tool support means (190) arranged to allow the axial extraction of said bung (4) along said axis of pivoting (D), by the exercise of a thrust force or traction on said bung (4). 3. 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) fixed on said drum ( 3), and in that said bung (4) has a second outer shaft portion (44) on which a bore (75) of said cover (7) slides. 4. Barrel assembly (1) according to one of the preceding claims, characterized in that said barrel shaft (18) and said bung (4) trap, with a functional clearance (J), a bearing ring (19) movable on said bearing surface (84), between, on the one hand and a first side (191) of said ring (19), or a first shoulder (83) that comprises said barrel shaft (18), or said ratchet carrier (81), and secondly and a second side (192) of said support ring (19) opposite said first side (191) and arranged to bear on a first end face ( 49) having said bung (4), on the opposite side to a second end face (49A) of said bung (4), which second end face (49A) defining, with said end shoulder (85) of said barrel (18), a functional spacing (E) of said barrel assembly (1) between bearings in which it is intended to pivot at the level of pivots at its first end it (86) and its said second end (87). 5. A barrel assembly (1) according to the preceding claim, characterized in that said functional clearance (J) is between 0.04 mm and 0.08 mm. 6. barrel assembly (1) according to claim 4 or 5, characterized in that said ratchet holder (81) comprises an inner housing for receiving said support ring (19). 7. A barrel assembly (1) according to one of claims 4 to 6, characterized in that said ratchet holder (81) comprises at least one notch (82) in the immediate vicinity of said first shoulder (83) and partially superimposed on said support ring (19) for allowing a thrust on said support ring (19) to be disassembled by means of a tool introduced by said notch (82), said at least one notch ( 82) and said support ring (19) together forming said extraction tool bearing means (190) of said bung (4). Barrel assembly (1) according to claim 1 or one of claims 3 to 6, characterized in that it comprises extraction tool support means (190) arranged to allow the axial extraction of said bung (4), according to said pivot axis (D), by the exercise of a tensile force on said bung (4), which consist of at least one groove (190A) and / or a shoulder that includes said plug (4) near a second end face (49A) that comprises said plug (4), at one of its ends opposite to said bearing face (43A) and beyond a second outer shaft portion (44) lower than comprises said bung (4) and arranged to slidably receive a bore (75) of a cover (7) arranged to constitute with said drum (3) a chamber (32) containing said at least one motor spring (2). 9. 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). 10. Barrel assembly (1) according to one of the preceding claims, characterized in that said bung (4) is made in two parts, a first tubular portion (4A) arranged to cooperate with said barrel shaft (18) and having at its two opposite axial ends a first end face (49) and a second end face (49A), and whose outer diameter of said tubular portion (4A) constitutes a first outer shaft portion (43) arranged to constitute a pivot of a bore (35) of said drum (3), and the other substantially tubular second portion (4B) having a bore driven on said first outer shaft portion (43) and which second portion (4B), or comprises said receiving surface (5) of said motor spring (2), or constitutes the inner end of said motor spring (2). 11. A barrel assembly (1) according to one of the preceding claims, characterized in that said spring (2) is fixed to said bung (4) by friction. 12. A barrel assembly (1) according to one of claims 1 to 10, characterized in that said spring (2) is welded or brazed to said bung (4) so as to form a unbreakable monoblock bung spring subassembly. 13. 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 a ratchet (12) pivotably mounted to said shaft barrel (18), or by a toothing drum (13) pivotally integral with said drum (3), and an outlet formed respectively, or by a toothing drum (13) pivotally integral with said drum (3), or by a ratchet (12) pivotably mounted to said barrel shaft (18). Timepiece (1000) comprising at least one watch movement (100) according to claim 13 and / or at least one barrel assembly (1) according to one of claims 1 to 12 for energy storage. with an incorporated inlet, or by a ratchet (12) pivotably mounted to said barrel shaft (18), or by a drum toothing (13) pivotally attached to said drum (3), and an outlet respectively constituted, or by a toothing drum (13) pivotally integral with said drum (3), or by a ratchet (12) mounted pivotally integral with said barrel shaft (18).