CH708043B1 - Exhaust wheel. - Google Patents

Abstract

The invention relates to an escape wheel (1) for a watch movement comprising: a hub (2) intended to be mounted to rotate with an axis, the axis being intended to be subjected to a mechanical torque; a plurality of resilient members (3) extending from the hub (2); a plurality of stop members (5) extending from the hub (2) and each interposed between two adjacent resilient members (3); wherein each resilient member (3) is provided with an end portion (4). According to the invention: said end portion (4) comprises at least a first (6) and a second (7) protuberance; the first protuberance (6) forms a tooth of the escape wheel for interacting with an anchor; and the second protrusion (7) forms a first abutment protrusion, extending towards, and engageable with, a first abutment member (5) adjacent thereto.

Description

Description TECHNICAL FIELD [0001] The present invention relates to the field of watchmaking. It relates, more particularly, an escape wheel.

STATE OF THE ART [0002] US 7,708,454, CH 705,300 and JP 4,849,998 disclose escape wheels, in which the exhaust teeth are formed by the tops of flexible blades extending from a rigid hub. In comparison with the conventional and relatively stiffer exhaust wheels, these flexible arm exhaust wheels have improved shock absorption between the pallets of the anchor. This is particularly important if the escape wheel is made from a breakable material such as silicon, corundum or the like, which can be easily damaged by mechanical impacts caused by the impacts between the exhaust teeth and the means of limiting the anchor.

In addition, the flexible blades of such flexible arm exhaust wheels store a certain amount of energy during the rest phases of the exhaust, due to the flexion of the flexible blades, a portion of this energy being restored at anchor during the impulse phases of the exhaust.

The escape wheel may be subject to a variable mechanical torque depending on the state of winding of the mainspring. As a result, the pulses supplied to the anchor can vary considerably, on the one hand as a function of the impulses due to the rotation of the hub, on the other hand as a function of the pulses due to the energy stored in the flexible blades during the rest phases. Therefore and similarly to a standard escapement (without flexible arm), the amplitude of the pendulum can vary considerably, which affects the isochronism of the watch movement.

The object of the invention is thus to provide an escape wheel capable of reducing at least partially the variation of the pulses supplied to the anchor when said wheel is integrated in a clockwork movement.

Disclosure of the invention [0006] More specifically, the invention relates to an escape wheel for a watch movement, comprising a hub intended to be mounted integral in rotation with an axis, the axis being intended to be subjected to a mechanical torque induced by a motor spring with which it is associated (via a conventional finishing gear), a plurality of elastic elements extending from the hub, a plurality of stop members extending to from the hub, each interposed between two adjacent elastic members, and wherein each elastic member is provided with an end portion.

According to the invention, said end portion comprises at least a first and a second protuberance, the first protuberance forming a tooth of the escape wheel intended to interact with the exhaust anchor to which it is associated, the second protrusion forming a first abutment protrusion, extending towards, and capable of cooperating with, a first adjacent abutment member.

Therefore, the amount of energy that can be stored in each elastic member during the rest phases can be limited depending on the bending of the elastic member before the first abutment protrusion comes into contact with the first member. adjacent stop. Once such contact is complete, the flexure of the elastic member being thus limited, the amount of energy stored is also limited. The pulse at the anchor due to the energy stored in the elastic element therefore remains substantially constant for the torque values applied to the hub of the escape wheel, which are sufficient to put the first abutment protrusion and the first adjacent abutment member in contact during the rest phases of the anchor.

Advantageously, the end portion may comprise a third protuberance forming a second abutment protrusion extending to a second adjacent abutment member. This third protuberance and the second adjacent abutment member may be arranged to substantially prevent rotation of the end portion relative to the point of contact between the second protuberance and the first adjacent abutment member when the second protuberance and the first adjacent abutment member. are in contact. Therefore, the geometric position of the teeth of the escape wheel is not undesirably changed when the axis of the escape wheel is subjected to a relatively large torque.

Advantageously, the elastic member may comprise at least two blades, and the end portion may comprise a fourth protuberance still forming a tooth of the escape wheel for interacting with the anchor. Therefore, the resilient member can withstand a torque applied around the point of contact between the second protrusion and the adjacent abutment member, thereby avoiding an undesirable change in the geometrical position of the teeth of the escape wheel when its axis is subject to a relatively large torque.

Advantageously, each elastic element is arranged in such a way that the first abutment protrusion and the first adjacent abutment element are intended to come into contact with each other when the elastic element is subjected to a mechanical torque equal to or greater than a predetermined torque, this predetermined torque being substantially 0.5 pNm. Therefore, the first abutment protrusion and the adjacent abutment element already come into contact during the rest phases when the axis of the escape wheel is subjected to a predetermined minimum torque. Thus, the pulse applied to the anchor due to the energy stored in the elastic element therefore remains substantially constant throughout the movement.

Advantageously, the escape wheel is formed in one piece and is preferably made of non-metallic material, preferably based on silicon, based on silicon dioxide, diamond-based, based on sapphire, ruby-based or corundum-based.

The object of the invention is also achieved by a method of transmitting energy between an escape wheel and an escapement anchor, the escape wheel being as defined above.

The method comprises the following steps: applying a mechanical torque to the hub of the escape wheel; by said pair, pressing a tooth of the escape wheel against a rest plane of the escape anchor, thereby bending the elastic element with which the tooth is associated until at least a portion of the the elastic element and / or the extremal part of the elastic element comes into contact with an adjacent abutment element, this flexion making it possible to store energy in the elastic element; releasing the tooth from the rest plane of the pallet of the anchor, to press it against an impulse plane of the escape anchor and transmitting at least a portion of the energy stored in the elastic element to said anchor impulse plan of the anchor.

This method has the same effects and the same advantages as the escape wheel according to the invention itself, which will not be repeated for reasons of space.

Preferably, the end portion comprises at least a first protuberance which forms said tooth of the escape wheel, and at least a second protrusion which forms a first abutment protrusion extending towards a first adjacent abutment element, the second protrusion coming into contact with an adjacent abutment member when applying said tooth of the escape wheel against said rest plane of the escape anchor.

Advantageously, said abutment elements are each interposed between two adjacent elastic members.

BRIEF DESCRIPTION OF THE DRAWINGS [0018] Other details of the invention will appear more clearly on reading the description which follows, made with reference to the appended drawing in which:

Fig. 1 is a plan view of an escape wheel according to one embodiment of the invention;

Fig. 2 is a partial plan view of an escape wheel according to another embodiment of the invention;

Fig. 3 is a plan view of an escape wheel according to the embodiment of FIG. 2 and an anchor;

Fig. 4 is a plan view of an escape wheel according to yet another embodiment of the invention and an anchor;

Fig. 5 is a plan view of an escape wheel according to yet another embodiment of the invention and an anchor;

Fig. 6 is a plan view of an escape wheel according to yet another embodiment of the invention;

Fig. 7 is a plan view of the escape wheel of FIG. 3 with his anchor in rest position;

Fig. 8 is a plan view of the escape wheel of FIG. 3 with his anchor during a first part of the impulse phase;

Fig. 9 is a plan view of the escape wheel of FIG. 3 with his anchor during a second part of the impulse phase;

Fig. 10 is a plan view of the escape wheel of FIG. 3 with its anchor at the end of the impulse phase (impulse phase on the tooth);

Fig. 11 is a graph qualitatively illustrating the energy transmitted to the balance in an exhaust having a conventional escape wheel; and

Fig. 12 is a graph illustrating qualitatively the energy transmitted to the balance wheel in an exhaust having an escape wheel according to the invention.

Embodiment of the Invention [0019] It will first be noted that identical or equivalent parts are indicated in the drawings with the same reference signs.

FIG. 1 shows an escape wheel 1 according to a first embodiment of the invention. The escape wheel 1 comprises a hub 2 pierced with an opening 2a for an axis (not shown) intended to be subjected to a torque provided by a motor spring of the clockwork movement in which the escape wheel 1 is intended to be integrated, so that it can be rotated in the direction of rotation R. The opening 2a can be formed at the discretion of those skilled in the art, according to known embodiments.

A plurality of elastic elements 3 extends from the hub 2 towards the outside of the escape wheel 1. In the present example, twenty elastic elements 3 have been illustrated, but this number can be chosen according to the needs of the watchmaker.

Between each pair of adjacent elastic elements 3 is a stop element 5, also extending from the hub 2 towards the outside of the escape wheel 1. These abutment elements 5 are formed in order to be substantially stiffer than the elastic members 3. The abutment members 5 as illustrated herein are perforated, but alternatively may be full.

It is noted that, for the sake of clarity, a single elastic element 3 and a single abutment element have been referenced, the other elastic elements and the other abutment elements respectively being substantially identical. In the following, if it is necessary to identify a stop element 5 upstream of an elastic element 3, this abutment element is identified with the suffix "a", the suffix "b" being used to identify the stop element 5 downstream.

Each elastic element 3 is provided at its free end with an end portion 4. Each end portion 4 comprises a plurality of protuberances 6, 7, 8, which protrude from the junction point between the elastic element 3 and its end portion. 4. The first protrusion 6 defines a tooth of the escape wheel 1, which is intended to interact conventionally with an anchor, and thus has a conventional shape. As illustrated here, the first protrusion 6 is formed to interact with a Swiss anchor, but the first protuberance 6 could be formed for any type of escapement.

The second protrusion 7 extends to the adjacent abutment element 5, in this case in the upstream direction, and forms an abutment protrusion, limiting the degree of flexion of the elastic element 3 when the latter is subjected to a sufficient torque by the hub, as will appear more clearly in the following.

In the embodiment shown in FIG. 1, each end portion 4 comprises a third protrusion 8, which in this case has no technical operation and could be deleted, as is the case in the embodiment of FIG. 6 (see below).

Figs. 2 and 3 show an alternative embodiment of an escape wheel according to the invention. Fig. 2 shows a partial view at an end portion 4 and the free ends of a first abutment member 5a adjacent to the end portion 4 in the upstream direction and a second abutment member 5b adjacent to the end portion 4 in downstream direction. The abutment members 5a, 5b as illustrated herein are solid, but alternatively may be perforated. As in the embodiment illustrated in FIG. 1, the first protrusion 6 is intended to form a tooth of the escape wheel 1.

The escape wheel according to the embodiment of Figs. 2 and 3 differs from that of FIG. 1 in that the third protuberance 8 is formed to interact with the second abutment member 5b, in the downstream direction of the end portion 4. The second protuberance 7 has a triangular beak shape, forming a first abutment protrusion, in order to contacting the upstream stop element 5a at a single contact point 5a2, taking the form of an angular side cut. The third protrusion 8 also has a beak shape, thus also forming a second abutment protrusion, and is intended to come into contact with the part 5bi of the downstream abutment element 5b overhanging the third protrusion 8. When the elastic element 3 is subjected to a sufficient torque by the hub 2, the second protrusion 7 comes into contact with the first abutment element 5a at the point of contact 5a2, and the third protrusion 8 comes into contact with the second abutment element 5b, which has a part 5 ^ overhanging the third protrusion 8. Thanks to this double contact between the protuberances 7, 8 of the extremal part 4 and the two abutment elements 5a, 5b situated on either side of the extremal part 4, unwanted rotation of the end portion 4 about the point of contact between the second protrusion 7 and the first abutment member 5a is substantially avoided, such so that the abutment position does not differ significantly as a function of the torque applied to the wheel. The operation of the escape wheel 1 is thus ensured even for relatively large torque values applied to the hub 2.

Fig. 3 shows the same escape wheel 1 as in FIG. 2, associated with its anchor 9. The anchor 9 is of standard shape, having an entry pallet 10 and an outlet pallet 13. It is pivoted in the usual manner about its axis 11, and therefore should not be described in more detail. Although the anchor 9 is illustrated as a monoblock anchor, this characteristic is not essential to the operation of the escapement: it works equally well with conventional anchors having ruby vanes.

In the view of FIG. 3, the first protrusion 6 of the extremal portion 4 of the elastic element 3 is illustrated in contact with the rest plane of the entry pallet 10 of the anchor 9.

In this illustration, the escape wheel 1 is not subjected to a torque, which is the case when the motor spring of the watch movement in which the escape wheel 1 is integrated is not back up or when the gear train is blocked. Consequently, the elastic element 3 is not flexed and is in its rest position. In addition, the end portion 4 is neither in contact with the upstream stop element 5a, nor with the downstream stop element 5b.

FIG. 4 also shows an alternative variant of an embodiment of the present invention, in a view similar to that of FIG. 3.

In this variant, the elastic element 3 consists of 2 blades 3a, 3b, linked by a single end portion 4. This end portion comprises a first protuberance 6, a second protrusion 7, and a third non-functional protuberance 8 (which can therefore be omitted), formed and operating in a manner analogous to that of the embodiment illustrated in FIG. 1. The end portion 4 further comprises a fourth protuberance 12, formed similarly to the first protrusion 6, and also serving as the tooth of the escape wheel 1. These two teeth of the escape wheel is that is, the first protuberance 6 and the fourth protuberance 12 are interconnected by a bar 14, which is substantially more rigid than the blades 3a, 3b of the elastic element 3. This bar 14 is illustrated in FIG. 4 as curved and full, but can also be straight and / or openwork.

The bar 14 and the two blades 3a, 3b of the elastic member 3 have essentially the same purpose as the double contact between the end portion 4 and the upstream abutment elements 5a and 5b downstream embodiments of Figs. 2 and 3, that is to say to avoid unwanted rotation of the end portion 4 when the elastic member 3 is subjected to a torque. In the case of FIG. 4, the bar 14 and the two blades 3a, 3b can withstand a torque applied around the point of contact between the second protrusion 7 and the upstream stop element 5a, so that the abutment position does not differ significantly in function of the torque applied to the wheel.

FIG. 5 shows another alternative of the invention, according to a view similar to that of FIG. 3.

This variant differs from that of FIG. 3 in that the first protuberance 6 has a pointed shape to form an escape wheel 1 for an English-type exhaust, that is to say with an unshared pulse, either on the pallet only.

FIG. 6 shows yet another variant, according to a view similar to that of FIG. 1.

This variant differs from that of FIG. 1 in that the terminal portion 4 is relatively smaller, and in that the third protuberance is absent. The second protuberance 7 is reduced to a curved corner projecting from the junction point between the elastic element and the end portion 4, extending towards a contact surface 5a2 of the upstream stop element 5a, with which the second protuberance is intended to come into contact when the elastic element 3 is in the bent position. In other words, the second protuberance can be considered as projecting from an axis formed by the projection of the elastic element towards the outside of the escape wheel.

The sequence of operation of the escape wheel 1 according to the invention during the rest phase, the release of the input pallet 10 of the anchor 9, and the pulse phase will be described later with reference to the embodiment illustrated in FIG. 3. It goes without saying that the other embodiments function essentially in the same way, mutatis mutandis, and this operation will not be specifically described. It is also noted that, in the description of the operation of the escape wheel 1, the reference signs 3-8 refer to the elastic element 3 and its extremal part 4 which interacts with the anchor 9 at a given moment. .

FIG. 7 illustrates an escape wheel 1 identical to that of the embodiment of FIG. 3, also with the first protrusion 6 of the end portion 4 of the elastic member 3 in the rest position against the rest plane of the pallet 10 of the anchor 9. In the illustration of FIG. 5, a torque has been applied to the hub 2 by means of its axis (not shown), this torque being of sufficient value to bend the elastic element 3 until the second protrusion 7 comes into contact with the point contact 5a2 of the upstream stop element 5a, and the third protrusion 8 comes into contact with the overhanging part 5b, of the swivel stop element 5b. It should be noted that this last point does not occur for the embodiments of the escape wheels 1 illustrated in FIGS. 1.4 and 6. Typically, the minimum torque to achieve this contact would be about 0.5 pNm for an exhaust that operates with between about 0.2 and 2 pNm of torque, but is likely to be arbitrarily chosen by watchmaker according to his needs and according to the construction of the movement. The other elastic elements that are not subject to the torque naturally remain in their rest positions.

FIG. 8 illustrates the position of the escape wheel 1 and the anchor 9 during a first part of its pulse phase, just after the release of the first protuberance 6 of the rest plane of the entry pallet 10 of the anchor 9. As is generally the case, the clearance causes the anchor 9 to rotate about its axis 11 in the clockwise direction (for the entry pallet) under the action of the pendulum (not shown), then starts the impulse phase.

The escape wheel 1, considered in its entirety, has a certain moment of inertia. In the case of a traditional escape wheel, that is to say rigid, at the time of release, the anchor is already moving, while the escape wheel is stopped. Due to its inertia and possibly also at least a part of the inertia of the upstream work train, it catches the input pallet only after about the first third of the impulse plane. The tooth gives an impulse to the anchor as it travels along the other two-thirds of the impulse plane.

The exhaust wheels having flexible teeth generally operate in a slightly different manner, the moment of inertia of the individual teeth, including their elastic elements, being substantially less important than the moment of inertia of the wheel exhaust taken in its entirety. Therefore, immediately after disengagement, the elastic member, which was bent in the rest position by the torque applied by the hub, can accelerate relatively quickly compared to the rest of the escape wheel, and can therefore follow the impulse plane of the pallet of the anchor to a greater extent than in the case of a rigid escape wheel. As a result, the tooth of the flexible escape wheel comes into contact with the pulse plane at a point closer to the rest plane than is the case for a rigid exhaust wheel as mentioned above.

This situation is shown in FIG. 8, in which the elastic element 3 is partially discharged, having applied a portion of the energy that it stores at the pulse plane of the entry pallet 10 of the anchor 9. Thanks to the flexion of the elastic element 3 limited by the contact between the second protrusion 7 and the upstream stop element 5a, the pulse supplied to the balance (via the anchor) due to the energy stored in the elastic element 3 is substantially constant for torque values greater than that required to bring the second protrusion 7 and the upstream abutment element 5a into contact, in the rest phase of the exhaust (as illustrated in Fig. 7), e.g. above 0.5 pNm.

FIG. 9 illustrates the situation a few moments after that illustrated in FIG. 6. The escape wheel 1 accelerates, and rotates in the direction of rotation R, and catches the extremal portion 4 of the elastic element 3. The first protrusion 6 remaining in contact with the pulse plane of the pallet 10 of the anchor 9, the elastic element 3 is thus bent again, until the second protrusion 7 comes into contact with the upstream stop element 5a and the third protrusion 8 comes into contact with the part overhanging 5b ·, the abutment member swallows 5b.

From the moment when the elastic element is again pressed on the upstream stop element 5a, the pulse supplied to the anchor 9 is given substantially exclusively by rigid transmission between the hub 2 and the first protrusion 6 via the upstream stop element 5a, the second protuberance 7 remaining in contact with the upstream stop element 5a and the third protuberance 8 remaining in contact with the downstream abutment element 5b until the end of the first stage. 'impulse.

FIG. 10 illustrates the situation just before the end of the impulse phase on the tooth. The first protrusion 6 is about to leave the pulse plane of the entry pallet 10 of the anchor 9, and it should be noted that the second protrusion 7 always remains in contact with the upstream stop element 5a and the third protuberance 8 remains in contact with the downstream abutment member 5b.

Once the first protrusion 6 is released by the anchor 9, the elastic element 3 returns to its rest form, and the first protuberance of another tooth comes into contact with the rest plane of the pallet. output 13 of the anchor 9. Subsequently, the operating sequence as described above for the input pallet 10 is repeated for the output pallet 13.

As regards the embodiment of the escape wheel 1 illustrated in FIG. 4, the sequence of operation is identical, not only for the first protrusion 6 of the extremal part 4, but also for the fourth protrusion 12, which also forms a tooth of the escape wheel 1 functionally identical to the first protrusion 6. It should be noted further that, for the embodiments of the escape wheel 1 illustrated in FIGS. 1 and 4, the comments above concerning the third protuberance 8 do not apply because the third protuberance 3 is not functional, and does not interact with the downstream abutment element 5b.

It should also be noted that a portion of the elastic element 3 can bear against the upstream stop element 5a, as an alternative to, or in addition to, the second protrusion 7 in all the embodiments. . In addition, as an alternative to or in addition to the abutment elements 5 interposed between the elastic elements 3 of the embodiment of FIG. 4, stop elements can be located between the blades 3a, 3b of the elastic element 3.

FIG. 11 illustrates qualitatively in graph form the energy transmitted to the balance wheel when using a traditional and rigid exhaust anchor and escape wheel, during the phases of disengagement and impulse. The values of E lying above the horizontal axis represent the energy supplied to the balance wheel by the escape wheel via the anchor 9, and those lying below the horizontal axis represent the energy consumed by the balance during the release to overcome the friction and pulling force. The bars in dark gray represent the energy values for the case where the drive member is heavily armed (relatively high torque applied to the hub), and bars in light gray represent the energy values for the case where the organ motor is weakly armed (relatively low torque applied to the hub). In this figure, it can be seen that the energy consumed during the release and the energy supplied during the pulse are greater if the drive member is heavily armed than if the drive member is weakly armed. The total energy transferred is greater if the motor unit is heavily armed than if it is weakly armed.

FIG. 12 illustrates, in a manner similar to FIG. 11, the energy E transmitted to the balance with the use of an escape anchor and an escape wheel according to the invention. The energy consumed during the release remains

Claims (11)

substantially similar to that of the case of FIG. 11. The energy supplied during the pulse can be divided between the energy supplied by the elastic element 3, and the energy supplied by the hub 2. Due to the limitation of the bending of the elastic element 3 due in contact between the protrusion (s) 7, 8 of the extremal portion 4 and the abutment elements 5, the energy stored in the elastic element 3 is regulated. Therefore, the energy supplied to the anchor 9 by the elastic member remains substantially constant. The energy supplied to the anchor due to the hub always varies according to the winding of the mainspring, but the total of the energy transferred relative to the winding of the mainspring is substantially more constant than for the traditional illustrated case. in fig. 11. Although the invention has been explained with reference to a limited number of embodiments of the escape wheel 1, it is not limited to these examples. There are indeed an unlimited number of forms of the escape wheel 1 incorporating the required characteristics, which are defined by the appended claims. claims 1. Exhaust wheel (1) for clockwork, comprising: - a hub (2) intended to be mounted integral in rotation with an axis, the axis being intended to be subjected to a mechanical torque; a plurality of elastic members (3) extending from the hub (2); a plurality of abutment elements (5) extending from the hub (2) and each interposed between two adjacent elastic elements (3); wherein - each elastic member (3) is provided with an end portion (4); characterized in that - said end portion (4) comprises at least a first (6) and a second (7) protuberance; the first protuberance (6) forms a tooth of the escape wheel (1) intended to interact with an anchor (9); and - the second protuberance (7) forms a first abutment protrusion, extending towards and capable of cooperating with a first abutment element (5) adjacent. 2. Exhaust wheel (1) according to the preceding claim, wherein the end portion (4) comprises a third protuberance (8) forming a second stop protrusion extending to a second abutment member (5) adjacent. 3. Exhaust wheel (1) according to the preceding claim, wherein the third protrusion (8) and the second abutment member (5) adjacent are arranged to limit the rotation of the end portion (4) relative to the point of contact between the second protuberance (7) and the first abutment member (5) adjacent when the second protuberance (7) and the first abutment member (5) adjacent are in contact. 4. Exhaust wheel (1) according to one of the preceding claims, wherein each elastic element (3) is arranged so that the second protrusion (7) and the first abutment member (5) adjacent are intended contacting each other when the elastic member (3) is subjected to a mechanical torque equal to or greater than a predetermined torque. 5. Exhaust wheel (1) according to one of the preceding claims, wherein the elastic element (3) comprises at least two blades, and wherein the end portion further comprises a fourth protuberance (12) forming a further tooth of the escape wheel (1) intended to interact with the anchor (9). 6. Exhaust wheel (1) according to the preceding claim, wherein said predetermined torque is substantially 0.5 pNm. 7. Exhaust wheel (1) according to one of the preceding claims, wherein the escape wheel (1) is formed in one piece. 8. Exhaust wheel (1) according to one of the preceding claims, wherein the escape wheel (1) is made of a non-metallic material, preferably based on silicon, based on silicon dioxide, to diamond base, sapphire based, ruby based, or corundum based. 9. A method of transmitting energy between an escape wheel (1) according to one of claims 1 to 8 and an exhaust anchor (9), the method comprising the following steps: - applying a mechanical torque to the hub the escape wheel (1); - By said pair, press a tooth of the escape wheel (1) against a rest plane of the anchor (9) exhaust, thus bending the elastic element (3) to which the tooth is associated until at least a portion of the elastic element (3) and / or the end portion (4) of the elastic element (3) comes into contact with an adjacent abutment element (5). storing energy in the elastic member; releasing the tooth from the rest plane of the anchor (9), pressing it against an impulse plane of the escapement anchor (9) and transmitting at least a portion of the energy stored in the element elastic (3) to said impulse plane of the anchor (9). 10. Method according to the preceding claim, wherein the end portion (4) comprises at least a first protuberance (6) forming said tooth of the escape wheel (1), and at least a second protuberance (7) forming a first abutment protrusion extending to a first adjacent abutment member (5), and wherein the second protuberance (7) contacts an abutment member (5) adjacent to the application of said tooth of the abutment wheel (5). exhaust (1) against said rest plane of the anchor (9) exhaust. 11. Method according to one of claims 9 or 10, wherein said abutment members (5) are each interposed between two adjacent elastic members (3).