WO2018127661A1

WO2018127661A1 - Assembly comprising an armband and a pocket for a connected object

Info

Publication number: WO2018127661A1
Application number: PCT/FR2018/050016
Authority: WO
Inventors: Antoine SCHWOOB; Alban OUDIN
Original assignee: Ilyu
Priority date: 2017-01-03
Filing date: 2018-01-03
Publication date: 2018-07-12
Also published as: FR3061423B1; FR3061423A1; EP3565435A1

Abstract

The invention relates to an assembly consisting of an armband (100) that can be secured to an arm of a user and a pocket (200) for a connected object (300). Either the armband (100) or the pocket (200) comprises a magnetic element (50), the other of the armband (100) and the pocket (200) comprises a ferromagnetic part (60), the pocket (200) comprises a flexible and elastically deformable case (230) that is able to accommodate this connected object (300), wherein the pocket (200) can be releasably attached to the armband (100), this attachment being brought about by magnetic interaction between this magnetic element (50) and this ferromagnetic part (60), the case (230) comprising a transparent upper face (231).

Description

ASSEMBLY COMPRISING A CUFF AND A POUCH FOR

CONNECTED OBJECT

The present invention relates to an assembly comprising a cuff adapted to be fixed on a user's arm and a pocket for a connected object.

Bracers suitable for being fixed on a human arm by means of an adjustable band surrounding the arm and on which a connected object such as a mobile phone (smartphone) can be fixed are known. For example the connected object is held in place on the cuff by one or more bands attached to the cuff which are provided with Velcro fasteners and which form a pocket surrounding this object when they are attached together.

The cuff may also include a pocket with a compartment with a zipper in which a smartphone can be slid.

Such an armband is a useful product for athletes who can, while practicing a sporting activity such as fitness, running, cycling, take their object connected with them without the burden of a bag, and have this connected object at hand.

Such armbands, however, have disadvantages.

Indeed, the user may need to take control of his connected object, for example to answer a call in the case of a phone, or view data, without having to interrupt his sporting activity. This is especially relevant for an activity such as running, indoor sports or cycling. But with such armbands, the connected object is not easily accessible. In addition, there is a significant risk that this object slides from the hands when the user detaches the cuff while the user in motion.

The present invention aims to remedy these disadvantages.

The invention aims to propose a set comprising a cuff that allows to take control of the connected object attached to the cuff at will, repeatedly and reliably, and to replace it without having to interrupt its sports activity. .

This goal is achieved thanks to the fact that one of the armband and the pouch comprises a magnetized element, the other of the armband and the pouch comprises a flexible pouch able to deform elastically, and adapted to house the connected object, the pouch comprising a ferromagnetic part, the pouch being adapted to be secured in a removable manner with the armband, this solidarity being effected by interaction between the magnetized element and the ferromagnetic part, the case having an upper face which is transparent.

Thanks to these provisions, the user can easily detach the connected object by moving the sleeve away from the cuff. The attachment of the connected object is effected even in the case where the user, when he brings the connected object closer to the cuff, does not position the ferromagnetic piece exactly in front of the magnetized element, for example because he is moving. Indeed the magnetic interaction between the pouch and the cuff leads to an optimal centering of the pouch on the magnetic element of the cuff, and a reliable attachment of the object connected to the cuff. The magnetic interaction also allows a separation / attachment of the pouch with the cuff as often as desired without reducing the binding force between the sleeve and the cuff.

Advantageously, the magnetized element comprises a first magnet located in a first position and a second magnet located in a second position distinct from the first position, the ferromagnetic part comprises a first ferromagnetic portion and a second ferromagnetic portion, so that when the fastening of the pouch with the cuff, the first ferromagnetic portion is opposite the first position, and the second ferromagnetic portion is opposite the second position, the first ferromagnetic portion and the second ferromagnetic portion are at a distance d from the first position; first magnet and the second magnet, respectively.

Advantageously, the distance d is such that the force of attraction between the cuff and the pouch in the fastening position is between 0.5 kg and 5 kg. Advantageously, the cuff comprises the magnetized element.

Advantageously, the case is able to be folded on itself elastically.

Advantageously, the magnetized element and the ferromagnetic part are each made of a metal coated with a coating. Advantageously, the cuff includes a heart rate sensor including a free portion is in contact with the skin of the user.

With this arrangement, the user has a reliable and continuous measurement of his heart rate during exercise, including when in motion.

Advantageously, the sensor is housed in a capsule, the capsule being fixed between two layers of said cuff.

The sensor is thus protected from moisture and shock, and can be fixed more easily in the cuff. The sensor can be easily removed from the cuff, for example to be recharged.

The invention will be better understood and its advantages will appear better on reading the detailed description which follows, of an embodiment shown by way of non-limiting example. The description refers to the accompanying drawings in which:

- Figure 1 is an exploded perspective view of the assembly according to the invention;

FIG. 2 is a perspective view of the magnetized element of the assembly according to the invention;

FIG. 3 is a perspective view of the ferromagnetic part of the assembly according to the invention;

FIG. 4 is a perspective view of the magnetized element and of the ferromagnetic part when the cuff and the pouch of the assembly according to the invention are in the securing position; FIG. 5A is a perspective view of the capsule of the assembly according to the invention,

- Figure 5B is another perspective view of the capsule of the assembly according to the invention.

In the description below, it is considered that the connected object that is able to be received in the package of the set according to the invention is a mobile phone or smartphone. However, the invention can also be used for any other connected object of similar size, substantially plane, and in particular provided with a screen for displaying information.

FIG. 1 shows a cuff 100 and a pouch 200 of a device according to the invention, before their joining. The different elements making up the cuff 100 on the one hand, and the pocket 200 on the other hand, are represented in perspective, dissociated from each other, before their respective assemblies by translation along a vertical axis. FIG. 1 thus makes it possible to appreciate the relative position of these various elements.

The cuff 100 comprises at one end a band that is adapted to fold around the user's arm and to attach to the opposite end to be held on the arm. This attachment is effected in known manner, for example by passing the band in slots in the opposite end, or Velcro ® fasteners.

The cuff 100 comprises a magnet element 50 which is fixed in or on this cuff 100. For example, the magnet element 50 is held between a first layer 110 and a second layer 120 of the cuff 100. These two layers take the magnet element 50 in sandwich, the magnetic element 50 being further fixed in the cuff 100 by a method for fixing the two layers one on the other around the magnetized element 50. This method is for example the bonding, the heat-bonding, the seam, of the first layer 110 with the second layer 120. In addition, the magnet element 50 can be directly attached to one and / or the other of these layers by one of these methods.

For example, the first layer 110 and / or the second layer 120 comprise a textile sub-layer, for example a woven fabric.

For example, one of these two layers (110, 120) consists of a medial sub-layer (for example neoprene) and two sub-layers of woven fabric (for example Lycra®) which are attached to the fabric. against each other (for example by gluing) by sandwiching the middle layer. The other of these two layers (110, 120) is woven fabric, for example Lycra ®.

Advantageously, the magnetized element 50 comprises a part made of a sufficiently thin and flexible material to be sewn with the first layer 110 and the second layer 120. For example, as represented in FIG. 2, this part is a portion or the whole of the periphery 58, for example the longitudinal ends of the magnetized element 50, the longitudinal direction being the direction along the largest dimension of the magnetized element 50. The pouch 200 comprises a ferromagnetic piece 60 which is fixed in or on this pouch 200.

Ferromagnetic means a material capable of being attracted by a magnet. Such a material can therefore be a magnet.

For example, the ferromagnetic part 60 is held between a first layer 210 and a second layer 220 of the pouch 200. These two layers take the ferromagnetic part 60 sandwiched, the ferromagnetic part 60 being further fixed in the pouch 200 by a method allowing the two layers to be affixed to each other around the ferromagnetic part 60. This process is, for example, the bonding, the heat-sealing, the seaming, of the first layer 210 with the second layer 220. In addition, the piece ferromagnetic 60 may be directly attached to one and / or the other of these layers by one of these methods.

Thus, advantageously, the ferromagnetic part 60 comprises a portion made of a sufficiently thin and flexible material to be sewn with the first layer 210 and the second layer 220.

As shown in FIG. 2, the magnet element 50 comprises a first magnet 52a and a second magnet 52b which are disjointed, that is to say separated by a non-magnetized material. The first magnet 52a is located at a first position, and the second magnet 52b is located at a second position distinct from the first position.

Thus, there are two separate, separate fixing points of the pouch 200 on the cuff 100, by magnetic cooperation between the first magnet 52a and the second magnet 52b, and the ferromagnetic part 60. This configuration improves the connection between the cuff 100 and the pocket 200, and helps to prevent rotation of the pocket 200 relative to the cuff 100 in the main plane of the pocket that can occur if the magnet element 50 comprises only one magnet. This configuration also improves comfort for the user.

Advantageously, the magnet element 50 forms a part of a single block, that is to say that the first magnet 52a and the second magnet 52b are connected by a central portion 55, which minimizes their movement, one by relative to the other and minimizes the movement of the pouch 200 relative to the cuff 100 in securing position.

For example, as shown in FIG. 2, the central portion 55 has holes 56, for example three slots, which allow evaporation of sweat when the cuff is in contact with the skin of the user.

For example, as shown in Figure 2, the central portion 55 has a smaller thickness than the end portions (which carry the first magnet 52a and the second magnet 52b). Thus, the weight of the magnetized element 50 is decreased.

Advantageously, the rest of the magnet element 50 outside the first magnet 52a and the second magnet 52b is made of a non-metallic material, which concentrates the magnetic field on the first magnet 52a and the second magnet 52b. For example, this material is a polymer, for example a silicone.

In any case, the magnetized element 50, at least its central portion 55, is rigid enough not to deform visibly (with the naked eye) when the cuff 100 is fixed on the arm of the user. Indeed, the ferromagnetic part 60 is necessarily flat when the smartphone 300 is inserted into the case 230. Thus, when the pouch 200 is secured to the cuff 100, the magnetic force between the ferromagnetic part 60 and the magnet element 50 is optimal. In particular, the first ferromagnetic portion 62a and the second ferromagnetic portion 62b are in contact over their entire surface with the first magnet 52a and the second magnet 52b, respectively.

Another advantage is that the magnetized element 50 is easier to handle, and its insertion and attachment in the cuff 100, whose layers are made of a more flexible material in order to be able to wrap around the arm of the user, is facilitated.

Advantageously, the first magnet 52a and the second magnet 52b are coated with a coating 59, for example a polymer, especially a silicone. The material of this coating 59 may be the material constituting the remainder of the magnetized element 50.

The manufacture of the magnetized element 50 is thus facilitated.

Moreover, by varying the thickness of this coating 59, it is possible to adjust the attraction force between the magnetized element 50 and the ferromagnetic part 60.

This situation is represented in FIG.

The first magnet 52a and the second magnet 52b each consist of three circular magnets and a wafer (51a, and 51b respectively) of ferromagnetic metal. For example, each plate (51a, 51b) comprises three housings, each able to receive one of the three magnets.

These plates (51a, 51b) have the advantage of better distributing the magnetic field, and also to facilitate the manipulation of the magnets (52a, 52b). In addition, manipulation of the magnets (52a, 52b) during the manufacturing process of the magnet element 50 is facilitated.

In the above embodiment, there are two separate, separate attachment points of the pouch 200 on the cuff 100.

In other embodiments, the magnetized element 50 comprises more than two disjointed magnets, which are distributed over the surface of the magnetized element 50.

In the ferromagnetic part 60, the part made of a ferromagnetic material can be connected in the mathematical sense, that is to say in one piece, and have sufficient dimensions for the first magnet 52a and the second magnet 52b to be in view of this ferromagnetic portion when the pocket 200 is secured to the cuff 100.

For example, this ferromagnetic part is a plate extending over the majority of the surface of the ferromagnetic part 60.

Alternatively, as shown in FIG. 3, the ferromagnetic part 60 comprises a first ferromagnetic portion 62a and a second ferromagnetic portion 62b that are disjointed, that is to say separated by a non-ferromagnetic material, for example a polymer, by example a silicone.

Advantageously, the first ferromagnetic portion 62a and the second ferromagnetic portion 62b are connected by a central portion 65, which minimizes their movement relative to each other and minimizes the movement of the pocket 200 relative to the cuff 100 in position of solidarity.

Advantageously, the first ferromagnetic portion 62a and the second ferromagnetic portion 62b are coated with a coating 69, for example a polymer, especially a silicone. The material of this coating 69 may be the material constituting the rest of the ferromagnetic part 60. If the coating 69 is a polymer other than a silicone, a polymer will advantageously be chosen for the coating 59 of the magnetized element 50, in order to optimize the friction at the contact zones between the magnetized element 50 and the ferromagnetic part 60.

As represented in FIG. 4, the first ferromagnetic portion 62a and the second ferromagnetic portion 62b are located such that, when the pouch 200 is joined to the cuff 100, the first magnet 52a is opposite the first ferromagnetic portion 62a, and the second magnet 52b is opposite the second ferromagnetic portion 62b.

Thus, the only parts of the ferromagnetic part 60 which are attracted magnetically by the first magnet 52a and the second magnet 52b are opposite these magnets when the cover 200 and the cuff 100 are secured. The connection between the pocket 200 and the cuff 100 is thus reinforced.

Advantageously, the distance between the first magnet 52a and the second magnet 52b is the largest possible, which increases the transverse stability of the fastening. For example, in the position of attachment with the pouch 200, the first magnet 52a is opposite one end of the pouch 200, and the second magnet 52b is opposite the other end of the pouch 200, these two ends being located on the longitudinal axis of the pouch. The longitudinal axis extends along the largest dimension of the pouch 200. Thus, the distance between the first magnet 52a and the second magnet 52b is substantially equal, for example immediately below, to the length of the pouch 200.

For example, each of the first magnet 52a and second magnet 52b extends over a width substantially equal to the width of the pouch 200, and the first ferromagnetic portion 62a and the second ferromagnetic portion 62b are shaped to be entirely opposite the first magnet 52a and the second magnet 52b respectively, when the pouch 200 and the cuff 100 are secured. Thus, the connection between the pouch 200 and the cuff 100 is reinforced.

As shown in FIG. 1 and FIG. 2, the first magnet 52a and the second magnet 52b each form a protuberance with respect to the rest of the magnetized element 50. These protuberances are housed in holes 112a and 112b in the first layer 110 of the magnet. cuff 100 so that they protrude from this first layer 110. Similarly, as shown in FIG. 1 and in FIG. 3, the first ferromagnetic portion 62a and the second ferromagnetic portion 62b each form a protuberance with respect to the rest of the ferromagnetic part 60. These protuberances are housed in holes 212a and 212b in the first layer 210 of the pouch 200 so that they protrude from this first layer 210.

Thus, the first ferromagnetic portion 62a and the second ferromagnetic portion 62b are directly in contact with the first magnet 52a and the second magnet 52b respectively, when the pouch 200 and the cuff 100 are secured. It is thus possible to optimize the distance between the magnetized element 50 and the ferromagnetic part 60, and it is not necessary to add layers of fabric (or other material) to the cuff 200. There is therefore a friction in their plane. contact between the first ferromagnetic portion 62a and the first magnet 52a on the one hand, and the second ferromagnetic portion 62b and the second magnet 52b on the other hand. This friction contributes to the lateral stability (in the main plane of the pocket 200 and the plane of the smartphone 300) of the fastening.

Advantageously, when the magnetized element 50 and the ferromagnetic part 60 are each coated with a polymer, polymers are chosen whose coefficients of friction with each other is as high as possible. For example, at least one of these polymers is a silicone or an elastomer.

This configuration also has the advantage that the distance d between the first ferromagnetic portion 62a and the first magnet 52a, and the second ferromagnetic portion 62b and the second magnet 52b, when the pouch 200 and the cuff 100 are secured, is equal to the sum of the thickness of the coating on one or the other of the first magnet 52a and the second magnet 52b, and the thickness of the coating on one or the other of the first ferromagnetic portion 62a and the second ferromagnetic portion 62b. This distance d can therefore be accurately calibrated by varying these thicknesses.

Advantageously, according to the tests carried out by the inventors, the distance d is such that the force of attraction between the cuff 100 and the pouch 200 when they are secured (in the fastening position) is between 0.5 kg and 5 kg, for example between 0.6 kg and 4 kg, for example between 0.6 kg and 3 kg.

Thus, knowing that a connected object 300 such as a smartphone, contained in the pouch 200, has a weight of between 0.1 and 0.3 kilos (100 to 300 grams), this attractive force is sufficiently high to prevent the sleeve 200 from detaching the cuff 100, and low enough to allow a user to detach the sleeve 200 cuff 100 without much effort.

The distance d is a function of the intensity of the magnetic field generated by the magnetized element 50, and the magnetic properties of the above coatings.

For a coating of the magnetized element 50 and the ferromagnetic part 60 of silicone, and magnets (52a, 52b) of neodymium alloy, the distance d is between 0.8 and 2.2 mm.

The pouch 200 also comprises a flexible holster 230 able to deform elastically.

This case 230 is intended to receive in a space 233 a connected object 300, for example a smartphone 300.

At rest (that is to say when not stressed), the case 230 has a flat shape, the upper face 231 of the case 230 and its lower face 232 are substantially flat and secured to a portion of their peripheries to retain the smartphone 300. This securing is performed for example by gluing, welding, sewing.

The rest of the periphery constitutes an opening through which the smartphone 300 can be slid into the space 233 formed by the case 230.

Advantageously, this opening is reclosable / openable to maintain the smartphone 300 in the case 230.

The upper face 231 of the case 230 is transparent in order to allow the user to consult the screen of the smartphone 300 without removing it from the case 230, and made of a material for controlling the smartphone 300 by contact of a finger on the screen through this material.

Advantageously, the upper face 231 has an opening for unlocking the smartphone 300 by fingerprint.

The case 230 is flexible and is able to deform elastically. According to the terminology in mechanics of deformable media, elastic deformation means that the material, when the stress (force) to which it is subjected is removed, resumes its initial shape (before application of the constraint).

In particular, the case 230 is sufficiently flexible (deformable) to be folded, or stretched in its main plane (in its longitudinal direction and in its transverse direction), with the fingers in a manner perceptible to the naked eye.

Thus, the case 230 is adapted to receive, at rest, a smartphone 300 of a first dimension (length and / or width), and after stretching, a smartphone 300 of a dimension greater than x% to this first dimension. For example, this value x is equal to 20%, advantageously equal to 50%.

Thus, the case 230 is adapted to receive a smartphone 300 chosen from a plurality of smartphones 300 of various sizes. This is advantageous because a single pocket 200 of the assembly according to the invention is suitable for housing a plurality of smartphone models, possibly any smartphone model 300. It is therefore not necessary to use a different pocket 200 by model 300 smartphone.

For example, the case 230 is adapted to receive 300 smartphones whose screen diagonal is between 4 inches to 5.1 inches, preferably less than 6 inches, or between 5.1 inches and 6 inches.

In particular, the case 230 can be folded elastically on itself, that is to say without damage or fracture. Attention if ever the plastic is positioned in the pocket rather than in the cuff, the sleeve may not be much deformed but can sufficiently deform in the orthogonal plane and parallel to itself to accommodate different thicknesses and widths of the phone.

For example, the case 230 is made of woven material.

Thus, the fibers of the woven material are fibers capable of elastically deforming (as defined above), for example elastomer, that is to say having an elastic limit greater than 100% (the fiber is therefore suitable for to double its length under the effect of traction without breaking).

The case 230 is secured to the ferromagnetic part 60. This fastening is effected for example by fixing the first layer 210 of the pouch 200 on the lower face 232 of the case 230.

The assembly according to the invention has been described above in the case where the cuff 100 comprises the magnetized element 50, and the pouch 200 comprises the ferromagnetic piece 60.

Alternatively, the cuff 100 comprises the ferromagnetic piece 60, and the bag 200 comprises the magnetized element 50.

According to one embodiment, the ferromagnetic piece 60 is itself a magnetized element.

Thus, the interaction between the magnetized element 50 and the ferromagnetic part 60 is greater than that in the case where the ferromagnetic part 60 is not magnetized permanently (magnet). The ferromagnetic part 60 can then have a lower mass for the same interaction force, which decreases the mass of the assembly according to the invention, and its manufacturing cost.

Optionally, in addition to the magnetized element 50 and the ferromagnetic part 60, the cuff 100 and the pouch 200 are provided with elements that mechanically cooperate with each other such as by hooking (velcro), latching, or interlocking, to contribute to maintain the pocket 200 on the armband 100.

Advantageously, the cuff 100 comprises a heart rate sensor 500. This sensor 500 is housed in a housing 510 which also includes a battery, a bluetooth chip (or other element capable of communicating with the smartphone 300). The sensor 500 includes a free portion 590 which measures the heart rate when in contact with the skin of the user. This free portion 590 is opposite an orifice in the wall of the housing 510 housing the sensor 500, so that this measurement is possible when the cuff 100 is fixed on the arm of the user.

Thus, the sensor 500 continuously measures the heart rate, and is able to exchange data with the smartphone 300, so that the user is able to consult his heart rate in real time when he is in exercise physical.

Advantageously, the housing 510 containing the sensor 500 is housed in a capsule 400, the capsule 400 being fixed between two layers of the cuff 100. The capsule 400 is shown in FIG. 5A and FIG. 5B.

For example, the capsule 400 is fixed between the first layer 110 and the second layer 120 of the cuff 100, as shown in FIG.

Advantageously, the capsule 400 comprises a portion made of a material sufficiently thin and flexible to be sewn or thermally bonded with the first layer 110 and the second layer 120. For example, as shown in FIG. 1, FIG. 5A and FIG. 5B, this part is the periphery 408.

The capsule 400 comprises a central part 440 in the form of a dome which defines a cavity 450 in which the sensor 500 is housed.

The capsule 400 includes a window 490 which leaves free the free portion 590 of the sensor 500 which is thus able to be in contact with the skin of the user, which is necessary to measure the heart rate.

The housing 510 containing the sensor 500 is held in the cavity 450 by interlocking and friction, and / or by snapping.

Advantageously, the material of the capsule 400 is biocompatible because a part is in contact with the skin of the user.

Advantageously, this material protects the sensor 500 against moisture and water, against shocks, as well as temperatures too low (-50 ° C) or too high (50 ° C) may damage the sensor 500.

Advantageously, the material of the capsule 400 is a polymer.

For example, the material of the capsule 400 is an elastomer, for example a silicone. The capsule 400 can thus deform by more than 100% by the fingers. The insertion of the housing 510 in the cavity 450 is thus facilitated.

According to one embodiment, the assembly according to the invention further comprises a strip which is distinct from the cuff 100 and in which the cap 400 containing the casing 510 is able to be housed, for example in a removable manner.

Thus, when the wearer wears a garment with sleeves, the band and the capsule 400 can be placed under this sleeve so that the sensor 500 is in contact with the skin, while the cuff 100 is worn over it. clothing. It will also be easier in this embodiment to reload the sensor 500 when necessary. Thus, the sensor 500 is able to measure the heart rate of the user continuously, while the user is able to secure and disconnect the sleeve 200 of the cuff 100 to see its heart rate in real time.

Claims

1. A set consisting of a cuff (100) adapted to be fixed on a user's arm and a pocket (200) for connected object (300), said assembly being characterized in that one of said cuff (100) or said pouch (200) comprises a magnetic element (50), the other of said cuff (100) and said pouch (200) having a ferromagnetic part (60), said pouch (200) comprises a flexible case (230) able to deform elastically, and adapted to accommodate said connected object (300), said pouch (200) being able to be secured in a detachable manner with said cuff (100), this joining being effected by magnetic interaction between said magnetic element ( 50) and said ferromagnetic piece (60), said case (230) having an upper face (231) which is transparent.

2. An assembly according to claim 1, characterized in that said magnetic element (50) comprises a first magnet (52a) located in a first position and a second magnet (52b) located in a second position distinct from said first position, said piece ferromagnet (60) comprises a first ferromagnetic portion (62a) and a second ferromagnetic portion (62b), such that when said pouch (200) is secured to said cuff (100), said first ferromagnetic portion (62a) is opposite said first position, and said second ferromagnetic portion (62b) is facing said second position, said first ferromagnetic portion (62a) and said second ferromagnetic portion (62b) are at a distance d from said first magnet (52a) and said second magnet (52b), respectively.

3. The assembly of claim 2, characterized in that said distance d is such that the attraction force between said cuff (100) and said pouch (200) in the securing position is between 0.5 kg and 5 kg.

4. An assembly according to any one of claims 1 to 3, characterized in that said cuff (100) comprises said magnetic element (50).

5. An assembly according to any one of claims 1 to 4, characterized in that said case (230) is adapted to be folded on itself elastically.

6. An assembly according to any one of claims 1 to 5, characterized in that said case (230) is made of a woven material.

7. An assembly according to any one of claims 1 to 6, characterized in that said connected object (300) is a mobile phone.

8. An assembly according to any one of claims 1 to 7, characterized in that said magnetic element (50) and said ferromagnetic part (60) are each made of a metal coated with a coating (59, 69).

9. An assembly according to any one of claims 1 to 8, characterized in that said cuff (100) comprises a heart rate sensor (500), a free portion (590) is in contact with the skin of the user.

10. The assembly of claim 9, characterized in that said sensor (500) is housed in a capsule (400), said capsule (400) being fixed between two layers of said cuff (100).