WO2014076393A2

WO2014076393A2 - Removable measuring device

Info

Publication number: WO2014076393A2
Application number: PCT/FR2013/052676
Authority: WO
Inventors: Johann Guerizec; Caroline Gillet
Original assignee: Decathlon
Priority date: 2012-11-15
Filing date: 2013-11-08
Publication date: 2014-05-22
Also published as: CN104797307A; WO2014076393A3; FR2997865A1; FR2997865B1; EP2919872A2

Abstract

The invention relates to a measuring device (10) for a racket (12), having a casing (24) which comprises a first portion (26) having a front face (28), and also a rear face (30) that has a flat surface (32) designed to rest against at least the side edges (22) of the branches (18), and a second portion (34) that projects from the rear face (30), said second portion (34) being designed to be housed between the two branches (18) while bearing against the inside edges (20) when said measuring device (10) is fitted on said racket (12), the second portion (34) having an upper end (40), a lower end (42) and opposite side faces (44) that are shaped so as to bear against the inside edges (20) of the branches (18) of the racket (12), and the flat surface (32) having two flat areas (32a) disposed on either side of the side faces (44) of the second portion (34), said flat areas (32a) being shaped so as to bear against the side edges (22) of the branches when the measuring device (10) is fitted on the racket (12).

Description

REMOVABLE MEASURING DEVICE

Background of the invention

The present invention relates to the field of measuring devices associated with sports equipment such as a racket and in particular a tennis racket equipped with a handle, a sieve, two branches connecting the handle of the racket to sieve of the racket.

Measuring devices for tennis rackets are known and come in different forms. These measuring devices are intended to measure physical parameters, such as, for example, the speed of rotation or even the acceleration of the racket.

These measuring devices are integrated into the structure of the racket to improve measurements. However, this implies that the user only uses the racket, incorporating this device, the drive. Indeed, rackets equipped with equipment to perform measurements are prohibited during tournaments. We therefore understand that the user will not be able to train and participate in tournaments with the same racket. In addition, the user of the racket incorporating the measuring device may be uncomfortable with the racket which will necessarily be different from the racket used in tournaments. We understand the disadvantages of this type of device that lacks flexibility and adaptability for the user.

It is also known removable measuring devices in relation to the racket.

The present invention more particularly relates to a measuring device which comprises a housing which comprises:

A first portion having a front face and a rear face having a flat surface configured to abut against at least the lateral edges of the branches, and

A second portion protruding from the rear face, said second portion being configured to be housed between the two branches while bearing against the inner edges when said measuring device is mounted on said racket,

the housing having a longitudinal direction which is parallel to the handle when said device is mounted on said racket, said housing comprising a battery and an electronic circuit electrically connected to the battery.

Such a device is described in particular in document FR 2829700. It describes the use of a housing that is housed between the two branches. The housing comprises on its rear face a pad integral with a block of foam. The foam block is disposed between the branches and has deformation properties. This device has several disadvantages. Indeed, first of all the foam block having deformation properties will have the drawback of being worn during its use. In addition, the housing is connected to the foam block by means of a stud located on the rear face. Thus, it is understood that the housing is likely to rotate when using the measuring device. As a result, measurement by the device is disturbed. The effectiveness of the measuring device is therefore greatly reduced since it does not provide accurate and reliable measurements.

Object and summary of the invention

An object of the invention is to provide a measuring device overcoming the aforementioned drawbacks.

The object of the invention is in particular to improve the measurement of the measuring device.

This object is achieved by the fact that, considered in the longitudinal direction of the housing, the second portion has an upper end, a lower end and opposite lateral faces shaped to bear against the inner edges of the branches, the width of the second portion. being decreasing towards the lower end, and the plane surface has two plane zones arranged on either side of the lateral faces of the second portion, said flat zones being shaped to bear against the lateral edges of the branches when the measure is mounted on the racket.

It is therefore understood that the side faces of the second portion, according to the invention, are positioned against the inner edges of the branches of the racket when the device is mounted on the racket.

Thus, the support provided by each of the opposite side faces of the second portion against the inner edges of the branches and the support provided by each of the flat areas of the flat surface against the edges Lateral branches provide increased stability of the case relative to the racket. In other words, thanks to the invention, the casing is locked in rotation relative to the racket along an axis perpendicular to the longitudinal direction.

Another advantage is that the side faces and the flat areas allow the housing to be positioned quickly and reliably. Yet another advantage of the device according to the invention is that it can be mounted on different models of racket.

Thus, thanks to the invention, the housing is easily positioned, properly wedged so that the quality of the measurements taken by the measuring device is improved.

In addition, according to an advantageous aspect, the two planar zones extend along the length of the second portion. In other words, the two planar zones border the lateral faces of the second portion, which further improves the behavior of the housing.

Advantageously, the two planar zones are perpendicular to the opposite side faces of the second portion. The interest is to obtain two flat areas that will achieve maximum support with the side edges of the branches of the racket. Thus, greater stability of the housing is obtained when the device is mounted on the racket. According to a preferred embodiment, considered in the longitudinal direction, the first portion has an upper portion and a lower portion, and the second portion projects from the upper portion of the first portion.

Advantageously, the lower portion has a flat face intended to bear against the upper edge of the handle of the racket.

It is understood that the second portion, projecting from the upper portion of the first portion, makes it possible to position and wedge the housing between the two branches of the racket, while the lower part, resting against the racket, offers a surface of additional support to further improve the stability of the device.

Particularly advantageously, the lower portion of the first portion has a thickness less than the thickness of the upper portion of the first portion, whereby when the user place his hand on the upper part of the handle and on the lower part of the case, it is not bothered by the presence of the case.

Preferably, the length of the second portion, considered in the longitudinal direction of the housing is at most equal to half the length of the housing. It is thus understood that a surface of the rear face of the lower part is available to come, in particular, bearing against the side edges of the branches of the racket. Advantageously, the upper portion has a width greater than the width of the lower portion, so that the lateral edges of the housing are inclined relative to the longitudinal direction.

It is understood that the inclined lateral edges can be made, for example, to conform to the shape of the branches of the racket. Thus, the space occupied by the housing does not cause discomfort in the movement of the racket. The case disturbs little the penetration of the racket in the air. It is the same for the sensations of the user compared to a racket not equipped with the measuring device.

In a preferred embodiment, the flat surface has a flat lower zone located at the lower portion of the first portion. In addition, the lower zone is shaped to abut against at least the lateral edges of the branches. It will be understood that the flat lower zone is distinct from the two aforementioned flat zones, the latter being in the upper part of the first portion, on either side of the second portion.

As mentioned above, the flat lower zone of the flat surface provides a greater bearing surface against the lateral edges of the branches.

According to a preferred embodiment, the housing further comprises at least one fastening strip bearing on at least one of the upper or lower portions of the first portion, and intended to be fixed to at least one of the branches or the handle racket when the device is mounted on the racket.

In addition, the fastening strips may be Velcro type, elastic material or a fastening strip may comprise a notch system.

It is understood that the fastening strip reinforces the stabilization of the case vis-à-vis the racket. In other words, the fastening strip improves the maintenance of the box mounted on the racket and thus the measurement accuracy of the measuring device is improved.

Advantageously, the first portion further comprises at least one passer disposed on the front face of the housing to receive the fastening strip. The cooperation of the band with the passer still allows to improve the maintenance of the racket box. Preferably, the housing is provided with at least one pair of loops disposed on the upper part.

Thus, when the fastening strip no longer surrounds at least one branch of the racket, said fastening strip remains connected to the case so that the fastening strip can not be lost. Moreover passers-by make it easier to mount the device on the racket.

According to another embodiment, the fastening strip may be secured by means of an adhesive to the housing.

Preferably, the electronic circuit comprises at least one accelerometer, which is preferably arranged in the lower part of the first portion.

It is understood that the accelerometer thus disposed has the advantage of being positioned stably. The interest is to obtain a minimum of variations of movement of the accelerometer with respect to its reference system and thus obtain effective measurement by the measuring device.

Preferably, considered in the plane of the rear face of the first portion, the area of the second portion is less than the area of the flat surface, whereby the device has on the rear surface a relatively important to bear against the side edges of the branches and also on the upper part of the handle.

According to a particularly advantageous aspect of the present invention, the second portion has the shape of a block and the two opposite side faces are inclined relative to the longitudinal direction of the housing.

It is understood that the interest is to comply with the inner edges of the branches to obtain a locking rotation of the housing when the latter is mounted on the racket. In addition, preferably but not exclusively, each of the opposite side faces of the second portion forms an angle with the longitudinal direction of the housing, this angle being between 10 ° and 30 °.

Thus, the opposite side faces are likely to be compatible with many rackets equipped with a handle, a sieve, two branches connecting the handle of the racket sieve of the racket.

Advantageously, the block further has a lower face, oriented transversely to the flat surface, said lower face being curved. The interest of the convex underside is to come to comply with the upper part of the handle of the racket having the join of the branches of the racket. Thus we understand that the convex shape bears against the join branches. Thus such support of the underside further improves the stability of the device so as to improve the measurement by the device.

Advantageously, the block is made of a rigid material, for example plastic. Preferably, but not exclusively, the block is made of the same material as the first portion.

Preferably, at least one of the faces of the block further comprises a non-slip coating. It is understood that the advantage of having a coating on one of the faces of the block is to obtain an increase in frictional forces. As a result we obtain a better adhesion of the face with one of the inner edges of the branches of the racket, as a result of which we further improves the maintenance.

In addition, preferably, each of the opposite side faces has a non-slip coating whereby a very good retention of the case vis-à-vis the racket is obtained.

Preferably, at least one of the flat areas is provided with a non-slip element. Through the use of a non-slip element on at least one of the flat areas, the housing gets a better grip on the support zone.

Advantageously, the height of the second portion, considered in a direction perpendicular to said planar surface, is at least equal to half the length of the housing. The interest is that the second portion has a height large enough to provide a greater support surface against the inner edges of the branches of the racket. Thus it is understood that the transmission of forces is better distributed over the entire surface of the opposite side faces of the second portion.

In addition, according to an advantageous aspect of the invention, the second portion comprises a recess formed inside said second portion. In other words, the block is hollow. Advantageously, the electronic circuit and / or the battery are housed in the recess. Preferably, the electronic circuit is housed in the first portion, while the battery is housed in the second portion. In this preferred embodiment, but not exclusive, the battery is thus housed in the recess of the second portion.

An interest is to obtain a distribution of balanced masses over the entire device. Thus, the housing according to the invention has the advantage of not creating an imbalance of the racket during use. Preferably, but not exclusively, the second portion is formed in one piece with the first portion.

Thus, it is understood that the entire housing provides increased rigidity and helps maintain the position of the housing when used when mounted between the branches of the racket.

The invention also relates to a racket equipped with a handle, a sieve, two branches having internal and lateral edges, said branches connecting the handle to the sieve, and comprising a measuring device according to the invention, in which flat areas bear against the lateral edges of the branches, and wherein the second portion is housed between the two branches so that the lateral faces of the second portion bear against the inner edges of the branches.

Brief description of the drawings

The invention will be better understood on reading the following description of an embodiment of the invention given by way of nonlimiting example, with reference to the appended drawings, in which:

- Figure 1 is a front perspective view of the measuring device according to the invention installed on a tennis racket; - Figure 2 is a rear perspective view of the device installed on a tennis racket;

- Figure 3 is a rear view in the plane of the device installed on a tennis racket;

FIG. 4 is a perspective view of the device according to the invention;

- Figure 5 is a rear perspective view of the device;

- Figure 6 is a side view of the device;

- Figure 7 is a rear view in the plane of the device in a variant;

FIG. 8 is a front perspective view of the device;

- Figure 9 is a front view in the plane of the device; and

- Figure 10 is a front perspective exploded view of the housing. Detailed description of the invention

FIGS. 1 to 10 show an example of a measuring device 10 according to the invention mounted on a racket 12 provided with a handle 14, a sieve 16 and two branches 18 comprising inner edges 20 and side edges 22. The branches 18 are used to connect the handle 14 of the racket sieve 16 of the racket. In this non-limiting example, it is a tennis racket.

In this example, the measuring device 10 is configured to measure at least the acceleration of the racket. For this purpose, it comprises at least one accelerometer. The accelerometer is part of an electronic circuit that will be described below.

Generally, snowshoes have a large hollow portion located between the sieve 16, the inner edges 20 of the branches 18 and the upper portion 14a of the handle where the branches 18 of the racket 12 meet.

Furthermore, referring to FIGS. 4 to 10, it can be seen that the measuring device 10 comprises a housing 24 which firstly comprises a first portion 26 having a front face 28, a rear face 30 which has a flat surface 32 The housing 24 comprises a cover 29.

It is understood that the flat surface 32 of the rear surface 30 is configured to bear against the side edges 22 of the legs 18, and in this example against the upper edge of the handle 14a. The housing 24 extends in a longitudinal direction D which is parallel to the handle when the housing 24 is mounted on the racket 12.

Furthermore, it is found that the housing 24 has a second portion 34 projecting from the rear face 30 of the first portion 26. In this example, the second portion 34 is rigid. The first and second portions 26, 34 are made, in this example, in a rigid material such as plastic.

It can be seen in FIGS. 4 and 5 that the second portion 34 consists of an upper end 40 and a lower end 42. It can be seen that the width of the second portion decreases when moving towards the lower end of the second portion 34. By width of the second portion 34 is meant the dimension which is perpendicular to the longitudinal direction D.

In addition, the second portion 34 has two opposite lateral faces 44 which bear on the inner edges 20 of the branches 18.

In this example, the opposite lateral faces 44 are inclined with respect to the longitudinal direction D of the housing 24 following the decrease of the width of the second portion 34. The user positions the second portion 34 of the housing by sliding the along the inner edges of the branches of the racket until the displacement in the longitudinal direction to the upper portion 14a of the handle 14 is no longer possible.

In FIG. 7, it can be seen that the opposite lateral faces 44 each form an angle α with respect to the longitudinal direction D of the housing 24 which is between 10 ° and 30 °.

Thus, the opposite lateral faces 44 bear against the inner edges 20 of the branches 18. Consequently, the second portion 34 will be unable to pivot about an axis X perpendicular to the plane P of the racket 12 and located substantially in the center of the second portion 34. Thus, the rest of the housing is also unable to pivot in the plane parallel to the plane P of the racket 12.

In addition, it is found that on each side of each of the opposite side faces 44 are arranged planar areas 32a. It is understood that the flat areas 32a will bear against the lateral edges 22 of the branches 18. Consequently, it can be seen that the planar zones 32a will make it possible to reduce the possibility of the second portion 34 and the first portion 26 of pivoting about an axis Y parallel to the plane P and perpendicular to the axis X located substantially in the center of the second portion.

In addition, in order to improve the support against the lateral edges 22 of the branches 18, it is noted that the planar zones 32a are perpendicular to the opposite side faces 44 of the second portion 28.

It can be seen in FIG. 9 that the first portion 26 consists of an upper portion 26a and a lower portion 26b. Considered in the longitudinal direction D of the housing 24, the upper portion 26a extends between the upper end of the housing and the lower end of the second portion, while the lower portion 26b extends below the upper portion 26a until at the lower end of the housing 24.

Furthermore, it can be seen in FIG. 6 that the upper portion 26a has a thickness e1 greater than the thickness e2 of the lower portion 26b. Thus, as can be seen when the device is installed on the racket, the lower portion 26b of the housing 24 offers a stall which hinders the least possible user who positions his hand on the upper part of the handle and on the lower part 26b of the housing 24.

Note in Figure 6 that the second portion 34 has a length L1, considered in the longitudinal direction D of the housing, which is less than half the length L2 of the housing.

It can also be seen that the two planar zones 32a extend along the length L1 of the second portion 34. In other words, the plane zones 32a line the lateral faces 44 of the second portion 34.

It can be observed in FIG. 7 that the upper portion 26a of the first portion has a width 11 greater than the width 12 of the lower portion of the first portion.

It is also noted that the lateral edges 46 of the housing 24 are inclined. In the illustrated example, the lateral edges 46 adapt to the convergent shape of the branches 18 of the racket 12 in order to bring a pleasant aesthetic appearance to the user. In Figures 1 to 3, the housing 24 is mounted on the racket.

The flat surface 32 of the rear face 30 comprises in the upper part 26a two flat areas 32a bearing against the lateral edges 22 of the branches 18 of the racket 12. The second portion 34 projecting between the two branches 18. The flat surface 32 furthermore has a flat lower zone 32b which is located at the lower part 26b of the first portion 26. In FIGS. 1 to 3, it can be seen that the flat lower zone 32b bears against the upper part of the handle 14a. , in order to allow the locking in rotation of the housing around the axis Y.

Referring to Figures 1 to 8, it is observed that the device comprises a fastening strip 48 which bears on the upper part of the front face of the first portion of the housing and also surrounds the branches of the racket.

We also note that the front face 28 of the first portion 24 of the housing has two pairs of loops 50a, 50b. A first pair 50a is located on the upper portion 26a of the front face 28 and a second pair 50b of loops is located in the lower portion 26b of the front face 28 of the first portion 26.

The two loops 50a located in the upper part 26a of the front face 28 are arranged face to face on opposite side edges 46 of the cover 29 of the housing 24. The fastening strip 48 passes through the two loops 50a of the upper portion 26a of the 28. Then the fastening strip surrounds the branches 18 of the racket 12.

When a force F is exerted in the longitudinal direction D facing the sieve of the racket, the fastening strip 48 rests against the branches 18 of the racket 12, so that the casing 24 undergoing the force F is substantially maintained in position by means of the fastening strip 48 which against the force F. The housing 24 and the fastening strip 48 are connected to one another, thus, thanks to the supports made by the fastening strip 48 against the branches 18, the housing 24 will remain substantially in its housing located in the upper portion 14a of the handle 14 of the racket 12.

The loops 50b located in the lower portion 26b are capable of receiving another fastening strip similar to the strip of fixation 48 located in the upper portion 26a of the first portion 26. Such fastening strip in one embodiment, passes through the two loops 50b located in the lower part and surrounds the upper portion 14a of the handle.

In FIG. 9, it can be seen that the electronic circuit 38 comprises an accelerometer 52. The accelerometer 52 is disposed in the lower part 26b of the first portion 26. Thus, the accelerometer 52 is able to perform precise measurements as soon as it is located in a very stable part of the device 10.

According to one embodiment, not limiting and not shown, the circuit comprises an inertial unit comprising at least the aforementioned accelerometer and other measuring means. The inertial unit is disposed in the lower part of the first portion. So when the case is mounted on the racket, the inertial unit takes the various measures of movement. The measurements are then passed to a local or remote storage space.

In FIG. 6, it can be seen in this example that the height defined in a direction perpendicular to the plane surface 32 is of a length equal to about half the length L2 of the housing 24.

According to one embodiment, which is not limiting, it is observed in the figure

7, that the second portion 34 is in the form of a block having a convex lower face 54.

Referring to Figures 3 and 7, it is noted that when the housing 24 is in position on the racket 12, the upper portion 14a of the handle comprises the joint between the branches 18 and whose shape of the joint is a complementary shape of the convex lower face 54, the convex lower face 54 bears against the surface 55 of the complementary shape.

In addition, it can be seen, again in FIG. 7, that if viewed in the plane of the rear face of the first portion, the area of the second portion is smaller than the area of the first portion. An interest is to maximize the area of the flat surface intended to come into contact with the handle 14 or the lateral edges 22 of the branches 18 of the racket 12, in order to stabilize the device.

According to a non-limiting embodiment, anti-slip coatings 56 are arranged on the opposite lateral faces 44 of in order to prevent slippage of the opposite lateral faces with respect to the inner edges 20 of the branches 18 of the racket.

In addition, it can also be seen that the flat surface comprises non-slip elements 58. In particular, but in a nonlimiting manner, non-slip elements 58 are arranged at least in the plane zones 32a located on either side of the lateral faces 44 of the second portion 34. It is also noted that anti-slip elements 58 are disposed on the flat surface 32b located in the lower part of the first portion.

According to Figure 2, the non-slip elements located on the flat surface 32 abut with the side edges 22 of the arms 18 of the racket 12 so as to increase the friction and thus the non-slip elements 58 participate in improving the maintenance of the housing compared to the branches of the racket.

In FIG. 10, it can be seen that the first portion 26 and the second portion 34 have recesses located inside the housing 24.

It can be seen, with FIGS. 9 and 10, that the battery 36 is located in the recess 34a of the second portion 34, while the first portion is able to receive the electronic circuit. An interest of this configuration, not limiting, is to distribute the masses of the device so that its center of gravity is located closest to the longitudinal axis of the racket 12.

Referring to the various figures, it is found, in addition, that the first portion 26 and the second portion 34 form a single piece, the cover 29 constituting an insert.

According to another non-limiting embodiment, not shown, the device 10 comprises the first portion, the second portion projecting from the rear face of the first portion and comprises a third portion symmetrical to the first portion along the plane P of the racket . The third portion is also attached to the second portion by a back face.

Claims

1. Device (10) for measuring a racket (12) provided with a handle (14), a sieve (16), two branches (18) having inner (20) and lateral (22) edges, the legs (18) connecting the handle (14) of the racket (12) to the sieve (16) of the racket, said device (10) comprising a housing (24) which comprises:

A first portion (26) having a front face (28) and a rear face (30) having a flat surface (32) configured to bear against at least the lateral edges (22) of the branches (18) , and

A second portion (34) projecting from the rear face

(30), said second portion (34) being configured to fit between the two legs (18) while bearing against the inner edges (20) when said measuring device (10) is mounted on said racket (12) ,

the housing (24) having a longitudinal direction (D) which is parallel to the handle (14) when said device (10) is mounted on said racket (12),

said housing (24) having a battery (36) and an electronic circuit (38) electrically connected to the battery (36),

characterized in that, considered in the longitudinal direction (D), the second portion has an upper end (40), a lower end (42) and opposed lateral faces (44) shaped to bear against the inner edges (20). branches (18), the width of the second portion (34) decreasing towards the lower end (42), and in that the flat surface (32) has two planar zones (32a) arranged on either side lateral faces (44) of the second portion (34), said planar zones (32a) being shaped to bear against the lateral edges (22) of the legs (18) when the measuring device (10) is mounted on the racket (12).

2. Device (10) according to claim 1, characterized in that the two planar zones (32a) are perpendicular to the opposite side faces (44) of the second portion (34).

3. Device (10) according to claim 1 or 2, characterized in that, considered in the longitudinal direction (D), the first portion (26) has an upper portion (26a) and a lower portion (26b), and the second portion (34) protrudes from the upper portion (26a) of the first portion (26).

4. Device (10) according to claim 3, characterized in that the lower portion (26b) of the first portion (26) has a thickness (le2) less than the thickness (2e 1) of the upper portion (26a). of the first portion (26).

5. Device (10) according to claims 3 or 4, characterized in that the length (Ll) of the second portion (34), considered in the longitudinal direction (D) of the housing is at most equal to half the length (L2) of the housing (24).

6. Device (10) according to any one of claims 3 to 5, characterized in that the upper portion (26a) has an upper width (II) to the width (12) of the lower portion (26b), so the side edges (46) of the housing (24) are inclined relative to the longitudinal direction (D).

7. Device (10) according to any one of claims 3 to 6, characterized in that the flat surface (32) has a lower region (32b) plane located at the lower portion (26b) of the first portion ( 26), and in that the lower zone (32b) is shaped to abut against at least the lateral edges (20) of the branches (18).

8. Device (10) according to claim 7, characterized in that the lower zone (32b) is also shaped to abut against an upper portion of the handle (14a).

9. Device (10) according to any one of claims 3 to 8, characterized in that it further comprises at least one fastening strip (48) bearing on at least one of the upper parts (26a) or lower (26b) of the first portion (26), and intended to be fixed to at least one of the branches (18) or the handle (14) of the racket when the device (10) is mounted on the racket (12). ).

10. Device (10) according to claim 9, characterized in that the first portion (26) further comprises at least one passer

(50a, 50b) disposed on the front face (28) of the housing to receive the fastening strip (46).

11. Device (10) according to any one of claims 3 to 10, characterized in that the electronic circuit (38) comprises at least one accelerometer (52) disposed in the lower part (26b) of the first portion (26). .

12. Device (10) according to any one of claims 1 to 11, characterized in that, considered in the plane of the rear face of the first portion (30), the area of the second portion (34) is less in the area of the flat surface (32).

13. Device (10) according to any one of claims 1 to 12, characterized in that the second portion (34) forms a rigid block, in that the two opposite side faces (44) are inclined relative to the direction longitudinal (D) of the housing (24).

14. Device (10) according to claim 13, characterized in that the block further has a lower face (54), oriented transversely to the flat surface (32), said lower face (54) being curved.

15. Device (10) according to claim 13 or 14, characterized in that at least one of the faces (44) of the block comprises a non-slip coating (56).

16. Device (10) according to any one of claims 1 to 15, characterized in that at least one of the plane areas (32a, 32b) is provided with a non-slip element (58).

17. Device (10) according to any one of claims 1 to 16, characterized in that the height (h) of the second portion (34), considered in a direction perpendicular to said flat surface (32), is at least equal to half the length (L2) of the housing.

18. Device (10) according to any one of claims 1 to 17, characterized in that the electronic circuit (38) is housed in the first portion (26), while the battery (36) is housed in the second portion (34).

19. Device (10) according to any one of claims 1 to 18, characterized in that the second portion (34) is formed in one piece with the first portion (26).

20. Device (10) according to any one of claims 1 to 19, characterized in that the second portion (34) is rigid.

21. Device (10) according to any one of claims 1 to 20, characterized in that the electronic circuit (38) and / or the battery (36) are housed in the second portion (34).

22. Racket (12) provided with a handle (14), a sieve (16), two legs (18) having inner and lateral edges, said legs (18) connecting the handle to the sieve, and having a measuring device (10) according to one of the claims

1 to 21, in which the flat areas abut against the lateral edges of the branches, and wherein the second portion is housed between the two branches so that the lateral faces of the second portion bear against the inner edges of the branches.