EP3845975B1 - Safety device and ringing mechanism - Google Patents

Description

Technical area

The field of the present invention concerns that of safety devices. More particularly, the present invention relates to the field of surprises in watch mechanisms.

Technology background

The striking mechanism is a very particular mechanism which is often used with a surprise fixed on a snail so as to prevent it from ringing falsely, or more precisely from ringing the time indicated by an indicator on a dial, which is not obvious just before a ten or quarter change for example.

Indeed, this passage is generally delicate because when it comes to the transition from one hour to another, i.e. at 59 minutes 50 seconds for example, and, in the absence of surprise, the striking mechanism (200) may sound the next time instead of sounding the indicated time, causing user confusion.

Thanks to the surprise, a safety mechanism well known to watchmakers (see for example "complicated watches" by François LECOULTRE pages 175-181), it is possible to manage the changes from 14 to 0 minutes every quarter and the change from 59 to 0 every hour, for example.

However, this mechanism is sensitive, complicated and induces an additional torque gain at the end of the ringing.

Furthermore, in the particular case of a chronograph repeater, when the jumper of the classic striking mechanism is in contact with the surprise, the latter applies a torque to the chronograph mobile and therefore can cause the chronograph friction to slip and therefore move the needle of chronograph, which would result in incorrect reading of the time measured by the user. The document EP 3 502 793 A1 shows all the features of the preamble of claim 1.

Summary of the invention

• un premier mobile ; ledit au moins un premier mobile étant configuré pour être engrené et monté mobile sur un axe ; ledit au moins un premier mobile comprenant au moins un organe de butée;
• un deuxième mobile ; ledit au moins un deuxième mobile étant monté mobile sur ledit axe et configuré pour être entraîné par ledit au moins un organe de butée lorsque ledit au moins un premier mobile est engrené ; ledit au moins un deuxième mobile comportant au moins une première portion correspondant à la partie entière d'un premier nombre, au moins une deuxième portion correspondant à la partie entière d'un deuxième nombre et au moins une portion intermédiaire disposée entre ladite au moins une première portion et ladite au moins une deuxième portion ;
• un élément d'actionnement ; ledit au moins un élément d'actionnement étant configuré pour agir sur ladite au moins une portion intermédiaire de sorte à dégager ledit au moins un deuxième mobile dudit au moins un organe de butée et de préférence à sonner la partie entière dudit deuxième nombre.

The present invention proposes to resolve all or part of these drawbacks by means of a safety device for striking a clock mechanism to sound the entire part of a number indicated by an indicator on a dial; said safety device comprising at least:

• a first mobile; said at least one first mobile being configured to be meshed and mobile mounted on an axis; said at least one first mobile comprising at least one stop member;
• a second mobile; said at least one second mobile being mounted mobile on said axis and configured to be driven by said at least one stop member when said at least one first mobile is engaged; said at least one second mobile comprising at least a first portion corresponding to the integer part of a first number, at least one second portion corresponding to the integer part of a second number and at least one intermediate portion arranged between said at least one first portion and said at least one second portion;
• an actuation element; said at least one actuating element being configured to act on said at least one intermediate portion so as to release said at least one second mobile from said at least one stop member and preferably to ring the entire part of said second number.

Thanks to this arrangement, the mechanism is simplified by the absence of surprise and therefore of constraints applied to the chronograph mobile.

• un premier mobile ; ledit au moins un premier mobile étant configuré pour être engrené et monté mobile sur un axe ; ledit au moins un premier mobile comprenant au moins un organe de butée;
• un deuxième mobile ; ledit au moins un deuxième mobile étant monté mobile sur ledit axe et configuré pour être entraîné par ledit au moins un organe de butée lorsque ledit au moins un premier mobile est engrené ; ledit au moins un deuxième mobile comportant au moins une première portion correspondant à la partie entière d'un premier nombre, au moins une deuxième portion correspondant à la partie entière d'un deuxième nombre et au moins une portion intermédiaire disposée entre ladite au moins une première portion et ladite au moins une deuxième portion ;
• un élément d'actionnement ; ledit au moins un élément d'actionnement étant configuré pour agir sur ladite au moins une portion intermédiaire de sorte à dégager ledit au moins un deuxième mobile dudit au moins un organe de butée et de préférence à sonner la partie entière dudit deuxième nombre.

In other words, the present invention relates to a surprise-free safety device comprising at least:

• a first mobile; said at least one first mobile being configured to be meshed and mobile mounted on an axis; said at least one first mobile comprising at least one stop member;
• a second mobile; said at least one second mobile being mounted mobile on said axis and configured to be driven by said at least one stop member when said at least one first mobile is engaged; said at least one second mobile comprising at least a first portion corresponding to the integer part of a first number, at least one second portion corresponding to the integer part of a second number and at least one intermediate portion arranged between said at least one first portion and said at least one second portion;
• an actuation element; said at least one actuating element being configured to act on said at least one intermediate portion so as to release said at least one second mobile from said at least one stop member and preferably to ring the entire part of said second number.

According to one embodiment, said at least one first mobile is mounted to move in rotation around said axis.

Thanks to this arrangement, the mechanism is more compact and better suited for repetitive movements.

According to one embodiment, said at least one second mobile is mounted to move in rotation around said axis.

Thanks to this arrangement, the mechanism is more compact and better suited for repetitive movements.

According to one embodiment, said at least one second mobile is mobile between at least a first position and at least a second position ; said at least one second mobile is in contact with said at least one stop member when said at least one second mobile is in said at least one first position or in said at least one second position.

Thanks to this arrangement, said at least one second mobile can move between at least two positions.

According to one embodiment, said at least one first mobile comprises at least one tooth to be meshed; said at least one tooth comprises at least one surface and/or at least one dimension configured to move said at least one actuating element from said at least one first portion or from said at least one second portion towards said at least one intermediate portion and preferably to move said at least one actuating element into contact with said at least one intermediate portion so that said at least one actuating element acts on said at least one intermediate portion and releases said at least one second mobile from said at least one stop member.

Thanks to this arrangement, said at least one second mobile is released from said at least one stop member.

According to one embodiment, said at least one actuating element is configured to exert a force on said at least one second mobile and preferably on said at least one first portion, said at least one second portion and/or said at least an intermediate portion so as to release said at least one second mobile from said at least one stop member; said force being generated by the force of gravity and/or by a support force exerted by a return member and/or a drive member on said at least one actuating element.

Thanks to this arrangement, said at least one actuating element exerts a force on said at least one second mobile so that it moves.

According to one embodiment, said at least one intermediate portion breaks down said force into a radial component to said axis and a component perpendicular to the radial component configured to move said at least one intermediate portion so that said at least one second mobile emerges from said at least one stop member.

Thanks to this arrangement, said at least one actuating element exerts a force on said at least one second mobile so that it moves.

According to one embodiment, said at least one actuation element is in contact with said at least one second mobile and preferably in contact with said at least one first portion corresponding to the integer part of a first number and at least one second portion corresponding to the integer part of a second number separated by at least one intermediate portion.

Thanks to this arrangement, said at least one actuating element exerts a force on said at least one second mobile so that it moves.

According to one embodiment, said at least one first mobile comprises a wheel and/or a pinion.

Thanks to this arrangement, said at least one first mobile can be engaged.

According to one embodiment, said at least one second mobile is a ringing cam.

Thanks to this arrangement, said at least one second mobile has a profile corresponding to seconds, tens of seconds, minutes, tens of minutes, quarters of minutes, hours, tens of hours, quarters of hours.

According to one embodiment, said at least one stop member is arranged on said at least one first mobile.

Thanks to this arrangement, said at least one first mobile can drive said at least one second mobile via said at least one stop member.

According to one embodiment, said at least one first portion and said axis are separated by a first distance, said at least one second portion and said axis are separated by a second distance and said at least one intermediate portion and said axis are distant from an intermediate distance between said first distance and said second distance.

Thanks to this arrangement, the element can pass the minutes or seconds.

The present invention relates to a striking mechanism comprising at least one safety device according to any one of the preceding claims, at least one arm and at least one striking cam arranged on said at least one safety device; said at least one ringing cam comprising at least one distal portion representing the entire part of said first number and at least one proximal portion representing the entire part of said second number; said at least one proximal portion being closer to said axis than said at least one distal portion so that when said at least one actuating element acts on said at least one intermediate portion, said at least one arm is moved from said at least one a distal portion towards said at least one proximal portion.

Thanks to this arrangement, the mechanism is simplified by the absence of surprises and the energy is optimized because there is no superfluous torque gain. Furthermore, the striking mechanism cannot ring out of tune when changing from one minute to another, i.e. at 59 seconds for example.

According to one embodiment, said at least one chiming cam is a seconds, tens of seconds, quarter minutes, minutes, or quarter hours chiming cam.

Thanks to this arrangement, the mechanism can strike the quarter minute and/or hour mark.

According to one embodiment, said at least one striking cam is a seconds, minutes or hours snail.

Thanks to this arrangement, the mechanism can sound the number of seconds, minutes and/or hours.

The present invention relates to a chronograph comprising at least one driven mobile, safety device according to the invention and/or a striking mechanism according to the invention, in which said at least one actuating element drives said at least one mobile. driven when said at least one actuating element acts on said at least one intermediate portion.

Thanks to this arrangement, the mechanism is simplified by the absence of surprises and the energy is optimized because there is no superfluous torque gain. Furthermore, the striking mechanism cannot ring out of tune when changing from one minute to another, i.e. at 59 seconds for example.

The embodiments and variants mentioned above can be taken individually or in any technically possible combination.

The present invention will be well understood and its advantages will also emerge in the light of the description which follows, given solely by way of non-limiting example and made with reference to the appended figures, in which identical reference signs correspond to elements structurally and/or functionally identical or similar.

Brief description of the figures

• La figure 1 illustre un dispositif de sûreté 100 selon un mode de réalisation ;
• Les figures 2A-2B exposent une partie d'un mécanisme de sonnerie 200 ; et,
• La figures 3A et 3B exposent une partie d'un mécanisme de sonnerie 200.

The invention will be described below in more detail using the appended drawings, given by way of non-limiting examples, in which:

• There figure 1 illustrates a safety device 100 according to one embodiment;
• THE figures 2A-2B expose part of a ringing mechanism 200; And,
• There Figures 3A and 3B expose part of a ringing mechanism 200.

Detailed description of the invention

The present invention proposes to omit the use of a surprise in a ringing mechanism 200 in order to simplify it on the one hand and on the other hand to avoid unnecessary torque gain and therefore optimize the energy available for the clockwork and/or striking mechanism. Furthermore, one of the advantages linked to this arrangement is to allow said striking mechanism 200 to ring correctly, when the passage from one minute to another, i.e. at 59 seconds for example.

To do this, said ringing mechanism 200 comprises at least one safety device 100 represented on the figures 1-3B , at least one arm 230 which can take the form of a feeler 230 for example, and at least one ringing cam 210 arranged on said at least one safety device 100.

On the Figures 2A to 4B , one embodiment according to the invention represents a chronograph repeater which can sound the minutes, tens of seconds and/or seconds but without being limited to a chronograph repeater because said striking mechanism 200 can also operate for any other watch with ringing, such as a minute repeater watch.

Indeed, as shown by the figures 4A-4B , said at least one safety device 100 has at least one first mobile 110, at least one second mobile 120 and at least one element actuation 130. The latter, that is to say said at least one safety device 100 can be associated with said at least one ringing cam 210 comprising at least one distal portion 211 representing the entire part of a first number on which said at least one arm 230 is in contact, visible on the figure 4A , and at least one proximal portion 212 representing the integer part of a second number as shown on the Figure 4B . In the embodiment of Figures 4A and 4B , said at least one striking cam 210 is a tens of seconds cam, but could also take the form of a seconds, quarter minutes, minutes, or quarter hours cam, or in another mode of embodiment, said at least one striking cam 210 can be a seconds, minutes or hours snail. Obviously, it is possible to superimpose these different embodiments on said at least one safety device 100.

Furthermore, it is clearly visible on the figures 4A-4B that said at least one proximal portion 212 is closer to said axis 101 than said at least one distal portion 211 so that when said at least one actuating element 130 acts on said at least one intermediate portion 123, said at least one arm 230 or feeler 230 will come to feel said at least one distal portion 211 instead of said at least one proximal portion 212.

In the following example based on the figures 4A-4B and for reasons of readability, said at least one chiming cam 210 represents a tens of seconds cam 210, the units of seconds cam will be deliberately omitted.

On all the figures and in particular on the figures 1-3B , as mentioned previously, said at least one second mobile 120 is driven by said at least one stop member 115 when said at least one first mobile 110 is in movement.

Said at least one second mobile 120 comprises at least a first and second portions 121, 122, preferably six portions for represent the six tens of seconds that constitute a minute and each said portion is separated by at least one intermediate portion 123.

As will be described below, said at least one safety device 100 also comprises at least one actuating element 130 configured to act on said at least one intermediate portion 123 so as to advance the cam and snail assembly of said mechanism ringing ring 200 of a given angle, and more precisely of an angle proportional to said at least one intermediate portion 123. This advance takes place every ten seconds and at the passage of a minute for example.

When said ringing mechanism 200 is activated just before said at least one actuating element 130 advances the cam and snail assembly, then we will ring for example 59 seconds, or the entire part of said first number. Thus, when said safety device 100 is integrated into a chronograph 300 comprising at least one driven mobile 310, said at least one actuating element 130 drives said at least one driven mobile 310, which can take the form of a counter 310 for example, when said at least one actuating element 130 acts on said at least one intermediate portion 123, so that said at least one driven mobile 310, or counter 310, is incremented.

And when said at least one actuating element 130 acts on said at least one intermediate portion 123, the cam and snail assembly of said striking mechanism 200 advances so as to strike the following minute and 0 seconds, i.e. the entire part of said second number.

In the example which follows, it will be considered that the user initiates said striking mechanism 200 for a chronograph at 29.83 seconds for example, said at least one arm 230 or feeler 230 comes into contact with said at least one distal portion 211 and more exactly at the end of said at least one distal portion 211 and will ring two tens of seconds but also 9 seconds, although the cam of the second units are not illustrated in this example, i.e. the entire part of 29. In the case of a chronograph repeater of poor manufacture or without said safety device 100 according to the invention, the latter could strike 39 seconds, because 29.83 seconds being close to 30 seconds, the feeler of the poorly manufactured chronograph could slip and sound three tens of seconds and 9 seconds. In other words, the difference between 29.83 seconds and 30 seconds is approximately 0.5% which could lead the poorly manufactured chronograph to make a rough approximation and sound three tens of seconds while the difference between 9 .83 seconds and 10 seconds is about 2%, so enough margin of error to sound "just" 9 seconds.

The reasoning is identical if the chronograph would indicate 9 minutes and 59 seconds for example. Said striking mechanism 200 will ring 9 minutes or the entire part of the minutes and 5 tens of seconds and 9 seconds or the entire part of the seconds, and not 10 minutes and 59 seconds because of the rough approximation.

This rough approximation could be due to a slight shock or wear of the end of the striking cam but also to the precision of machining and assembly of the different parts present in the chronograph repeater of poor manufacture, and in the cases the most common, brings the probe into contact with the wrong part of the cam and therefore will sound “false”.

As mentioned previously, one way to overcome this mistake is to add a surprise. However, the latter induces an additional torque gain at the end of the ringing on the one hand but above all, the jumper of the classic striking mechanism, in contact with the surprise, applies a torque on the chronograph mobile and therefore could cause the friction of the chronograph to slip. chronograph and therefore move the chronograph hand, which would result in incorrect reading of the time measured by the user, which is not tolerable in said striking mechanism 200 for plaintiff's chronograph, where everything is perfectly adjusted and optimized to ring true.

Indeed, said safety device 100 of the applicant is an unsurprising safety device 100 making it possible to ring the entire part of a number indicated by an indicator on a dial thanks to at least a first mobile 110, to at least a second mobile 120 and at least one actuation element 130, as is visible on the figure 1 .

THE Figures 2A and 2B show, for their part, said at least one first mobile 110 mounted mobile on an axis 101, preferably mounted mobile in rotation around said axis 101, which allows said safety device 100 and at the same time said ringing mechanism 200 to be more compact and better suited for repetitive movements like that of chronographs for example.

Indeed, said at least one first mobile 110 may be in the form of a wheel 110 and/or a pinion 110 or may comprise a wheel and/or a pinion in order to be able to be meshed. In this sense, the latter, that is to say said at least one first mobile 110, is provided with at least one tooth 111 to be able to be meshed.

Said at least one stop member 115, mentioned above, can be arranged on said at least one first mobile 110 and configured to allow the driving of said at least one second mobile 120 when said at least one first mobile 110 is engaged.

On the figures 2A-3B , said at least one second mobile 120 is represented in a movable manner on said axis 101, preferably said at least one second mobile 120 is mounted to move in rotation around said axis 101, and configured to be driven by said at least one stop member 115.

Always visible on the figures 2A-3B , said at least one second mobile 120 can be a drive cam 120, which can have a profile corresponding to seconds, tens of seconds, minutes, tens of minutes, quarters of minutes, hours, tens of hours, or quarters of hours for example. Said at least one second mobile 120 is called a drive cam 120 because it can drive said at least one ringing cam 210.

Said at least one second mobile 120 may also comprise at least a first portion 121 corresponding to the integer part of a first number, at least one second portion 122 corresponding to the integer part of a second number and at least one intermediate portion 123 arranged between said at least one first portion 121 and said at least one second portion 122. It is exactly this portion, that is to say said at least one intermediate portion 123 which is configured to act with said at least one element actuation mechanism 130, mentioned above, so as to release said at least one second mobile 120 from said at least one stop member 115 and therefore allow said ringing mechanism 200 to ring the entire part of said second number during delicate passage.

As can be observed in the aforementioned figures, said at least one first portion 121 is distant from said axis 101 by a first distance 125 and said at least one second portion 122 is distant from said axis 101 by a second distance 124. Said at least an intermediate portion 123, located between said at least one first portion 121 and said at least one second portion 122, is spaced from said axis 101 by an intermediate distance 129 comprised between said first distance 125 and said second distance 124. It is obvious for skilled in the art, that by "distance" it should be understood that this is the average distance of said at least one first portion 121 with said axis 101: the same goes for said at least one second portion 122 and said at least one intermediate portion 123.

As mentioned previously, said at least one second mobile 120 is mobile between at least a first position 126 and at least a second position 127, represented on the figures 2A , 3A And 2B , 3B respectively. In said at least one first position 126, said at least one second mobile 120 is in contact with said at least one stop member 115, since as described above, said at least one stop member 115 drives said at least one second mobile 120, and when said at least one actuating element 130 acts on said at least one intermediate portion 123, said at least one second mobile 120 is moved towards said at least one second position 127, that is to say said at least one second mobile 120 is no longer in contact with said at least one stop member 115: in other words, said at least one actuating element 130 releases said at least one second mobile 120 from said at least one member of stop 115.

The cinematic, which the aim is to reproduce figures 2A-2B and 3A-3B, shows how said at least one tooth 111, which comprises at least one surface and/or at least one dimension, is configured to move said at least one actuating element 130 from said at least one first portion 121 towards said at least one intermediate portion 123, more particularly, how said at least one actuating element 130 is moved into contact with said at least one intermediate portion 123 so that it, that is to say said at least one actuating element 130, acts on said at least one intermediate portion 123 and releases said at least one second mobile 120 from said at least one stop member 115.

Indeed, when said at least one first mobile 110 is rotated around said axis 101, or more precisely when said at least one first mobile 110 is engaged in rotation around said axis 101 via said at least one tooth 111 , said at least one actuating element 130 slides and/or rubs, depending on the materials used, on said at least one first portion 121 which forces said at least one second mobile 120 to be in contact with said at least one control member. stop 115, and consequently, if said ringing mechanism 200 is engaged, said at least one feeler 230 will be in contact with said at least one distal portion 211.

In particular, said at least one actuating element 130 is configured to exert a force on said at least one second mobile 120 and preferably on said at least one first portion 121, on said at least one intermediate portion 123 and on said at least one a second portion 122 and this said force is generated by the force of gravity and/or by a support force exerted by a return member and/or a drive member on said at least one actuating element 130, this which makes it possible to maintain said at least one actuating element 130 in contact with said at least one second mobile 120.

When said at least one actuating element 130 is in contact with said at least one intermediate portion 123, the latter, that is to say said at least one intermediate portion 123 breaks down said force into a radial component to said axis 101 and a component perpendicular to the radial component so as to move said at least one intermediate portion 123 more quickly than said at least one first mobile 110 engaged and therefore allow said at least one second mobile 120 to disengage from said at least one stop member 115, and consequently, if said ringing mechanism 200 is engaged, said at least one feeler 230 will be in contact with said at least one proximal portion 212.

Consequently, as said at least one safety device 100 is associated with said at least one striking cam 210, when the user initiates said striking mechanism 200 of the chronograph at 29.83 seconds of the example described above, said at least one actuating element 130 will exert a force on said at least one first portion 121 and said at least one feeler 230 will come into contact with said at least one distal portion 211 and more exactly at the end of said at least one distal portion 211 and will ring two tens of seconds or 9 seconds, depending on whether it This is a feeler for the whole part of tens of seconds or the whole part of seconds and not 30 seconds.

When the chronograph indicates 30 seconds, said at least one actuating element 130 will act on said at least one intermediate portion 123 and therefore said at least one second mobile 120 will be moved more quickly than said at least one first mobile 110 and consequently said at least one second mobile 120 will be released from said at least one stop member 115 which will make it possible to present said at least one proximal portion 212 of said at least one ringing cam 210 of said ringing mechanism 200 in front of said at least one feeler 230 .

Finally, when said at least one probe 230 comes into contact with said at least one proximal portion 212, the ringing mechanism 200 will ring three tens of seconds, or the entire part of tens of seconds.

The reasoning is identical if the chronograph would indicate 9 minutes and 59 seconds for example. Said striking mechanism 200 will ring 9 minutes or the entire part of the minutes and 5 tens of seconds and 9 seconds or the entire part of the tens of seconds and seconds, and not 10 minutes and 59 seconds because of the rough approximation.

It is clear from the present description that the term "integer part" in the present invention has the same definition as that given in mathematics and computer science, that is to say the natural integer part of a real number : $$\left|\mathrm{not}\right|\le x<\left|\mathrm{not}+1\right|\mathit{with}\mathrm{not}\in {\mathbb{N}}_0\mathit{And}x\in ℝ$$

For example, if the time indicated on the chronograph is 01'06", or 1 minute and 6 seconds, the integer part of said first number, that is to say minutes in this example, will be 1 and the part integer of said second number, again minutes, will be 2.

$$\left|n_{15}\right|\le \frac{x}{15}<\left|n_{15}+1\right|\mathit{avec}{n}_{15}\in {\mathbb{N}}_0\mathit{et}x\in ℝ$$

Regarding tens or quarters, the definition is still valid since it is appropriate to divide by a ten or a quarter: $$\left|{\mathrm{not}}_{10}\right|\le \frac{x}{10}<\left|{\mathrm{not}}_{10}+1\right|\mathit{with}{\mathrm{not}}_{10}\in {\mathbb{N}}_0\mathit{And}x\in ℝ$$

$$\left|{\mathrm{not}}_{15}\right|\le \frac{x}{15}<\left|{\mathrm{not}}_{15}+1\right|\mathit{with}{\mathrm{not}}_{15}\in {\mathbb{N}}_0\mathit{And}x\in ℝ$$

If equations E03 and E02 are used, the fractional part will be determined by equation E01. For example, if the chronograph indicates 29 minutes and 59 seconds, equation E03 will give 1 quarter of an hour and the fractional part will be determined by equation E01 which will give 14 minutes. The same goes for the seconds since E02 will give 5 tens of seconds and E01 will give 9 seconds. It follows therefore that the integer part of the first number mentioned above is 1, 14, 5 and 9 according to the cam, and the integer part of the second number mentioned above is 2, 0, 0 and 0, also according to the cam.

Claims (15)

1. Safety device (100) for a striking-work of a horological mechanism for striking the integer part of a number indicated by an indicator on a dial; said safety device (100) comprising at least:

   - a first wheel (110); said at least one first wheel (110) being configured to be meshed with and movably mounted on a shaft (101); said at least one first wheel (110) comprising at least one abutment member (115);

   - a second wheel (120); said at least one second wheel (120) being movably mounted on said shaft (101) and configured to be driven by said at least one abutment member (115) when said at least one first wheel (110) is meshed; said at least one second wheel (120) including at least one first portion (121) corresponding to the integer part of a first number, at least one second portion (122) corresponding to the integer part of a second number and at least one intermediate portion (123) disposed between said at least one first portion (121) and said at least one second portion (122);

   - an actuating member (130);

   said safety device being characterised in that said at least one actuating member (130) is configured to act on said at least one intermediate portion (123) so as to free said at least one second wheel (120) from said at least one abutment member (115) and preferably strike the integer part of said second number.
2. Safety device (100) according to claim 1, wherein said at least one first wheel (110) is mounted movably in rotation about said shaft (101).
3. Safety device (100) according to claim 1 or 2, wherein said at least one second wheel (120) is mounted movably in rotation about said shaft (101).
4. Safety device (100) according to any one of the previous claims, wherein said at least one second wheel (120) is mobile between at least one first position (126) and at least one second position (127); said at least one second wheel (120) is in contact with said at least one abutment member (115) when said at least one second wheel (120) is at said at least one first position (126) or at said at least one second position (127).
5. Safety device (100) according to any one of the previous claims, wherein said at least one first wheel (110) comprises at least one tooth (111) to be meshed; said at least one tooth (111) includes at least one surface and/or at least one dimension configured to move said at least one actuating member (130) of said at least one first portion (121) or of said at least one second portion (122) towards said at least one intermediate portion (123) and preferably to move said at least one actuating member (130) in contact with said at least one intermediate portion (123) so that said at least one actuating member (130) acts on said at least one intermediate portion (123) and frees said at least one second wheel (120) from said at least one abutment member (115).
6. Safety device (100) according to any one of the previous claims, wherein said at least one actuating member (130) is configured to exert a force on said at least one second wheel (120) and preferably on said at least one first portion (121), said at least one second portion (122) and/or said at least one intermediate portion (123) so as to free said at least one second wheel (120) from said at least one abutment member (115); said force being generated by the force of gravity and/or by a bearing force exerted by a return member and/or a drive member on said at least one actuating member (130).
7. Safety device (100) according to claim 6, wherein said at least one intermediate portion (123) decomposes said force into a component radial to said shaft (101) and a component perpendicular to the radial component configured to move said at least one intermediate portion (123) so that said at least one second wheel (120) is freed from said at least one abutment member (115).
8. Safety device (100) according to any one of the previous claims, wherein said at least one actuating member (130) is in contact with said at least one second wheel (120) and preferably in contact with said at least one first portion (121) corresponding to the integer part of a first number and said at least one second portion (122) corresponding to the integer part of a second number, separated by said at least one intermediate portion (123).
9. Safety device (100) according to the previous claim, wherein said at least one first wheel (110) comprises a disc and/or a pinion.
10. Safety device (100) according to the previous claim, wherein said at least one second wheel (120) is a striking-work cam (210).
11. Safety device (100) according to any one of the previous claims, wherein said at least one abutment member (115) is disposed on said at least one first wheel (110).
12. Safety device (100) according to any one of the previous claims, wherein said at least one first portion (121) and said shaft (101) are distant by a first distance (125), said at least one second portion (122) and said shaft (101) are distant by a second distance (124) and said at least one intermediate portion (123) and said shaft (101) are distant by an intermediate distance (129) between said first distance (125) and said second distance (124).
13. Striking-work mechanism (200) comprising at least one safety device (100) according to any one of the previous claims, at least one arm (230) and at least one striking-work cam (210) disposed on said at least one safety device (100); said at least one striking-work cam (210) including at least one distal portion (211) representing the integer part of said first number and at least one proximal portion (212) representing the integer part of said second number; said at least one proximal portion (212) being closer to said shaft (101) than said at least one distal portion (211) so that when said at least one actuating member (130) acts on said at least one intermediate portion (123), said at least one arm (230) is moved from said at least one distal portion (211) towards said at least one proximal portion (212).
14. Striking-work mechanism (200) according to the previous claim, wherein said at least one striking-work cam (210) is a striking-work cam (210) of the seconds, of the tens of seconds, of the quarter minutes, of the minutes, or of the quarter hours.
15. Chronograph (300) comprising at least one driven wheel (310), and a safety device (100) according to any one of the previous claims one and/or a striking-work mechanism (200) according to claim 13 or 14, wherein said at least one actuating member (130) drives said at least one driven wheel (310) when said at least one actuating member (130) acts on said at least one intermediate portion (123).

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