CN104797307A - Removable measuring device - Google Patents

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 measurement mechanism

Technical field

The present invention relates to the field of the measurement mechanism of the article relevant to sports equipment (such as racket, particularly tennis racket), described sports equipment is such as racket, particularly tennis racket, its two branches being equipped with shank, head and racket shank being connected to racket head.

Background technology

Measurement mechanism for tennis racket is known, and has different forms.These measurement mechanisms are intended to measure physical parameters, such as velocity of rotation or racket acceleration.

These measurement mechanisms are incorporated in the structure of racket, to improve metering system.But, this means that user can only use the racket training being combined with this device.This is because the racket be equipped for carrying out the hardware measured is forbidden in play.Therefore will be understood that, user can not use same racket to carry out training and taking part in game.In addition, the user being combined with the racket of measurement mechanism is used can to feel uncomfortable when using racket (they are inevitable different from the former) that use in match.People are expressly understood the shortcoming of the device of this shortage flexibility and the adaptive type of user.

The measurement mechanism that can be removed relative to racket is also known.

The present invention relates more specifically to a kind of measurement mechanism comprising shell, and described shell comprises:

Part I, has front surface and has the rear surface of flat surfaces, and this flat surfaces is constructed at least to recline the lateral edges of (breasting) branch, and

From the Part II that described rear surface is stretched out, described Part II is constructed to when described measurement mechanism is installed on described racket, and Part II to be placed between two branches and to abut on inward flange,

When described device is installed on described racket, the longitudinal direction of described shell is parallel to shank,

Described shell comprises battery and is electrically connected to the electronic circuit of battery.

Such device is particularly described in patent document FR 2829700.This document describe the use of the shell be placed between two branches.This shell is comprising liner thereafter on the surface, and itself and a foam block form a single component.This foam block is arranged between branch, and has deformation characteristic.This device has some shortcomings.Specifically, first the foam block with deformation characteristic can have the shortcoming of in use wearing and tearing and exhausting.In addition, shell is connected to foam block by the liner be positioned on rear surface.It should be understood that shell easily rotates between the measurement mechanism operating period thus.Therefore, the measurement undertaken by this device can be disturbed.Therefore, owing to can not carry out accurately and reliably measuring, the efficiency of measurement mechanism is significantly reduced.

Summary of the invention

An object of the present invention is to propose a kind of measurement mechanism that can improve above-mentioned shortcoming.

The present invention is especially intended to improve the measurement undertaken by this measurement mechanism.

This object is realized by the following fact: along the longitudinal direction of above-mentioned shell, above-mentioned Part II has upper end, bottom and relative side surface, the shape of these side surfaces is suitable for resting on the inward flange of above-mentioned branch, the width of Part II reduces towards bottom, and above-mentioned flat surfaces has two flat sites, these two flat sites are arranged on the side of the side surface of Part II respectively, when described measurement mechanism is installed on racket, the shape of described flat site is suitable for the lateral edges abutting in branch.

Therefore, it should be understood that according to the present invention, when described device is installed on racket, the side surface of Part II is posted by the inward flange of the branch of racket and is located.

Like this, breasting effect (the bearing produced relative to the inward flange of branch by each relative side surface of Part II, supporting), and the breasting effect to be produced relative to the lateral edges of branch by each flat site of flat surfaces, shell is improved relative to the steadiness of racket.In other words, by means of the present invention, shell relative to racket along the rotation of the axis perpendicular to longitudinal direction by locking.

Another advantage is, above-mentioned side surface and flat site make shell can by fast and reliably locate.In addition, be also advantageous in that it can be installed on the racket of different types according to another of device of the present invention.

Like this, by means of the present invention, shell is located simply and is correctly wedged, thus improves the quality of the measurement result that this measurement mechanism obtains.

In addition, in a favourable scheme, these two flat sites extend along the length of Part II.In other words, the side surface of these two flat sites and Part II has intersection (line), further improves the fixing of shell like this.

Advantageously, these two flat sites are perpendicular to the relative side surface of Part II.Its advantage is that the existence of these flat sites can produce the maximum breasting effect of the lateral edges relative to racket branch.Thus, when this device is installed on racket, this device can obtain larger steadiness.According to a preferred embodiment, in a longitudinal direction, this Part I has upper and lower, and Part II stretches out from the top of this Part I.

Advantageously, this bottom has flat surfaces, in order to be posted by the top edge of the shank of racket.

Be understood that, the Part II stretched out from the top of Part I makes shell to be located and is wedged between two racket branches, bottom (it is bearing on racket) then provides additional abutment surface, thus further increases the steadiness of device.

In particularly advantageous mode, the thickness of the bottom of Part I is less than the thickness on the top of Part I, thus, when hand is placed on the top of shank and the bottom of shell by user, can not feel excessive uncomfortable due to the existence of shell.

Preferably, along the longitudinal direction of shell, the length of this Part II equals the half of the length of shell at the most.It should be understood that the surface of the rear surface of bottom can to recline the lateral edges of racket branch in (particularly) thus.Advantageously, the width on top is greater than the width of bottom, and the lateral edges of shell is tilted relative to longitudinal direction.

It should be understood that the lateral edges of inclination can be manufactured into the shape of the branch such as following racket.Like this, any obstruction that the space occupied by shell can not cause racket to move.Shell is not remarkable to the aerial interference of passing through of racket.This make user by it compared with the racket not arranging measurement mechanism time there is identical sensation.

According to a preferred mode, flat surfaces has smooth lower area, and this lower area is positioned at the height identical with the bottom of Part I.In addition, the shape of this lower area is suitable for the lateral edges being at least bearing on branch.It should be understood that this smooth lower area is what to separate with two aforesaid flat sites, the latter is arranged in the top of Part I, and is in every side of Part II.

As previously mentioned, the smooth lower area of flat surfaces makes it possible to the larger surface of the lateral edges obtaining breasting branch.

According to a preferred mode, this shell also comprises at least one fixed band, it is positioned in the top of Part I or at least one of bottom, and on this fixed band at least one branch of being intended to be fixed on racket when this device is arranged on racket or shank.

In addition, fixed band can be made up of Velcro (Velcro) or elastomeric material, or this fixed band can comprise grasping system.

It should be understood that fixed band enhances the steadiness of shell relative to racket.In other words, fixed band improves the confining force of the shell be arranged on racket, makes the measuring accuracy of measurement mechanism be improved thus.

Advantageously, Part I also comprises the ring be arranged on the front surface of shell, in order to receive fixed band.Band improves the confining force of shell on racket further with coordinating of ring.Preferably, shell is provided with at least one pair of ring be arranged on top.

Like this, when fixed band is no longer around at least one branch of racket, described fixed band keeps being connected to shell, and this fixed band can not be misplaced.In addition, above-mentioned ring contributes to device to be arranged on racket.

According to another embodiment, fixed band forms single parts by bonding and shell.

Preferably, electronic circuit at least comprises accelerometer, and it is preferably disposed in the bottom of Part I.

It should be understood that the accelerometer arranged like this has the advantage of locating in a robust way.Its benefit is that the change of the motion making accelerometer relative to its reference system is minimum, and obtains effective measurement result by this measurement mechanism thus.

Preferably, in the plane of the rear surface of Part I, the area of Part II is less than the area of flat surfaces, makes this device on rear surface, have relatively large surface to abut in the lateral edges of branch and to abut in the top of shank thus.

In a particularly advantageous scheme of the present invention, in block form, and two relative side surfaces are relative to the longitudinal axis of shell for Part II.

It should be understood that its benefit is to have followed the shape of the inward flange of branch, thus shell obtains the locking rotated shell when being installed on racket.

In addition, preferably but without limitation, each relative side surface of Part II separately with the longitudinal direction structure of shell at angle, this angle is between 10 ° and 30 °.

Like this, above-mentioned relative side surface can fit on multiple (be equipped with shank, head and racket shank be connected to two branches of racket head) racket.

Advantageously, above-mentioned piece also has a lower surface, and this lower surface is oriented as crossing with flat surfaces, and described lower surface is rounded.The benefit of circular lower surface is that it has followed the shaped upper part of the racket shank of the connecting portion comprising racket branch.It should be understood that the above-mentioned round-shaped connecting portion being posted by branch.Like this, this breasting effect of lower surface further increases the steadiness of this device, thus improves the measurement of this device.

Advantageously, be made up of rigid material (such as plastics) for above-mentioned piece.Preferably but without limitation, be made up of the material identical with Part I for above-mentioned piece.

Preferably, at least side of above-mentioned piece also comprises nonskid coating.It should be understood that on a surface of this block, to establish cated benefit to be to obtain the frictional force increased.Therefore, obtain this surface to racket branch better tack of inward flange, thus further increase confining force.

In addition, preferably, each relative side surface includes nonskid coating, obtains the extraordinary confining force of this shell on racket thus.

Preferably, at least one flat site is provided with slip-proof element.Owing to using slip-proof element at least one flat site, shell has better tack to breasting region (bearing area).

Advantageously, along the direction perpendicular to described flat surfaces, the height of Part II at least equals the half of the length of shell.

Its benefit is, Part II is enough high, to provide the effect on the larger surface (supporting) being posted by the inward flange of racket branch.It should be understood that, on the whole surface of the relative side surface of Part II, the transmission of power is distributed better thus.

In addition, in a favourable scheme of the present invention, Part II is included in the recess that described Part II inside is formed.In other words, above-mentioned piece is hollow.Advantageously, electronic circuit and/or battery are placed in this recess.Preferably, electronic circuit is placed in Part I, and battery is placed in Part II.In this preferred but nonrestrictive distortion, battery is arranged in the recess of Part II.

An one benefit is, quality is distributed on whole device with being balanced.Like this, shell according to the present invention has and can not produce the unbalanced advantage of racket during use.Preferably but without limitation, Part II and Part I form an one piece component.

It should be understood that shell integrally makes rigidity improve thus, and when shell is installed between racket branch, between its operating period, contribute to shell to remain on its position.

The invention still further relates to a kind of racket, this racket is equipped with shank, head and has two branches of inward flange and lateral edges, shank is connected to head by described branch, and this racket also comprises according to measurement mechanism of the present invention, wherein flat site is posted by the lateral edges of branch, and wherein Part II is placed between two branches, the side surface of Part II is rested on the inward flange of branch.

Accompanying drawing explanation

Read hereafter to the description of the embodiments of the invention provided with non-limiting exemplary forms by referring to accompanying drawing, the present invention can be understood better, in the accompanying drawings:

Fig. 1 is mounted in the front perspective view according to measurement mechanism of the present invention on tennis racket;

Fig. 2 is mounted in the rear perspective view according to measurement mechanism of the present invention on tennis racket;

Fig. 3 is mounted in the rear plan view of the device on tennis racket;

Fig. 4 is the stereogram according to device of the present invention;

Fig. 5 is the rear perspective view of this device;

Fig. 6 is the side view of this device;

Fig. 7 is the rear plan view of a kind of distortion of this device;

Fig. 8 is the front perspective view of this device;

Fig. 9 is the front plan view of this device;

Figure 10 is the front perspective view of the decomposition of shell.

Detailed description of the invention

Fig. 1 to Figure 10 shows the example according to measurement mechanism 10 of the present invention be arranged on racket 12, and described racket is equipped with shank 14, head 16 and comprises two branches 18 of inward flange 20 and lateral edges 22.The shank 14 of racket is connected to the head 16 of racket by branch 18.In this non-limiting example, this racket is tennis racket.

In this example, measurement mechanism 10 is configured to the acceleration at least measuring racket.For this purpose, this measurement mechanism comprises at least two accelerometers.This accelerometer is following by a part for the electronic circuit of description.

Generally speaking, racket has a wide recess, and this recess is positioned at the position between head 16, the inward flange 20 of branch 18 and the top 14a (branch 18 of racket 12 is crossing at this) of shank.

In addition, by referring to Fig. 4 to Figure 10, can see, measurement mechanism 10 comprises shell 24, and first this shell 24 comprises Part I 26, and Part I has front surface 28 and has the rear surface 30 of flat surfaces 32.Shell 24 comprises lid 29.

It should be understood that the flat surfaces 32 of rear surface 30 is constructed to recline the lateral edges 22 of branch 18, is the top edge 14a of the shank that reclines in this example.

When shell 24 is installed on racket 12, shell 24 extends along the longitudinal direction D being parallel to shank.

In addition, appreciable, shell 24 comprises the Part II 34 stretched out from the rear surface 30 of Part I 26.In this example, Part II is rigidity.In this example, Part I 26 and Part II 34 are made up of rigid material (such as plastics).

In figures 4 and 5, can see, Part II 34 is made up of upper end 40 and bottom 42.It should be noted that the direction along the bottom towards Part II 34, the width of Part II reduces.The width of Part II 34 is understood to the size perpendicular to longitudinal direction D.

In addition, Part II 34 comprises two relative side surfaces 44, and these side surfaces abut on the inward flange 20 of branch 18.

In this example, along with Part II 34 reduces, relative side surface 44 tilts relative to the longitudinal direction D of shell 24.User is by sliding the inward flange of the Part II 34 of shell along racket branch until again towards the position of the top 14a movement of shank 14, can not locate this Part II along the longitudinal direction.

In the figure 7, can see, above-mentioned relative side surface 44 forms an angle [alpha] relative to the longitudinal direction D of shell 24 separately, and this angle is between 10 ° to 30 °.

Like this, relative side surface 44 abuts on the inward flange 20 of branch 18.Therefore, Part II 34 can not around perpendicular to racket 12 plane P and be located substantially on the axis X pivotable at the center of Part II 34.Like this, this shell remainder can not in the plane of plane P being parallel to racket 12 pivotable.

In addition, can see, be equipped with flat site 32a in each side of each relative side surface 44.It should be understood that flat site 32a will abut on the lateral edges 22 of branch 18.

Therefore, can see, flat site 32a can reduce Part II 34 and Part I 26 possibility around axis Y pivotable, and this axis Y is parallel to plane P, and perpendicular to being located substantially on the axis X at Part II center.

In addition, in order to improve reclining to the lateral edges 22 of branch 18, it should be noted that the relative side surface 44 of flat site 32a perpendicular to Part II 28.

In fig .9, can see, Part I 26 is made up of top 26a and bottom 26b.Extend between the upper end and the bottom of Part II of shell along the longitudinal direction D of shell 24, top 26a, and bottom 26b extends until the bottom of shell 24 in the below of top 26a.

In addition, in figure 6, can see, the thickness e 1 of top 26a is larger than the thickness e 2 of bottom 26b.Like this, as finding, when this device is installed on racket, the bottom 26b of shell 24 eliminates haply when hand is placed on the top of shank and the bottom 26b of shell 24 by user, and user may be caused slightly to feel uncomfortable problem.

In figure 6, it should be noted that Part II 34 has length L1, and this length is less than the half of the length L2 of shell when watching along the longitudinal direction D of shell.

Can also see, two flat site 32a extend along the length L1 of Part II 34.In other words, the side surface 44 of flat site 32a and Part II 34 has intersection.

Can see in the figure 7, the width 11 of the top 26a of Part I is larger than the width 12 of the bottom of Part I.

Also noteworthy is that, the lateral edges 46 of shell 24 tilts.In this demonstrated example, lateral edges 46 adapts, to make user feel joyful in aesthetic with the contraction shape of the branch 18 of racket 12.

In Fig. 1 to Fig. 3, shell 24 is installed on racket.

The flat surfaces 32 of rear surface 30 comprises two flat site 32a on the lateral edges 22 of the branch 18 abutting in racket 12 at top 26a.Part II 34 stretches out between two branches 18.Flat surfaces 32 also has smooth lower area 32b, and this lower area is positioned on the height identical with the bottom 26b of Part I 26.In Fig. 1 to Fig. 3, can see, smooth lower area 32b abuts in the top 14a of shank, thus locking shell is around the rotation of axis Y.

Referring to figs. 1 through Fig. 8, can see that this device comprises fixed band 48, it is located on the top of the front surface of the Part I of shell, and around the branch of racket.

It should be noted that the front surface 28 of the Part I 24 of shell comprises two couples of rings 50a, 50b equally.First couple of ring 50a is positioned on the top 26a of the front surface 28 of Part I 26, and second couple of ring 50b is positioned on the bottom 26b of front surface 28.

Two the ring 50a being arranged in the top 26a of front surface 28 are arranged Face to face on the lateral edges 46 that (two) of the lid 29 of shell 24 are relative.Fixed band 48 is through two ring 50a of the top 26a of front surface 28.This fixed band is around the branch 18 of racket 12 subsequently.

When D in a longitudinal direction applies power F towards the head of racket, fixed band 48 reclines the branch 18 of racket 12, the shell 24 making to bear this power F by this power F of opposing fixed band 48 and be substantially maintained on its position.Shell 24 and fixed band 48 are interconnected, and like this, by the effect of reclining produced relative to branch 18 by fixed band 48, shell 24 itself can remain in the top 14a of the shank 14 of racket 12 substantially.

The ring 50b being arranged in top 26b can receive another fixed band similar to the fixed band 48 of the top 26a being positioned at Part I 26.According to an embodiment, this fixed band through two the ring 50b being positioned at bottom, and around the top 14a of shank.

In fig .9, can see, electronic circuit 38 comprises accelerometer 52.Accelerometer 52 is arranged in the bottom 26b of Part I 26.Like this, as long as be arranged in the very firm parts of device 10, accelerometer 52 just can be measured accurately.

According to an embodiment, non-limiting and typically non-, this circuit comprises inertance element, and this inertance element at least comprises aforesaid accelerometer and other measurement mechanism.This inertance element is arranged on the bottom of Part I.Like this, when shell is installed on racket, this inertance element performs the various measurement to motion.Measurement result is transferred in the memory space of Local or Remote subsequently.

In figure 6, can see in this example, the height defined along the direction perpendicular to flat surfaces 32 is approximately equal to the half of the length L2 of shell 24.

According to a non-limiting embodiment, can see in the figure 7, Part II 34 presents the bulk form with rounded lower surface 54.

With reference to Fig. 3 to Fig. 7, it should be noted that, shell 24 is positioned on this position of racket 12: in this position, the top 14a of shank comprises the connecting portion between branch 18, and the shape of this connecting portion is the shape with lower surface 54 complementation of circle, circular lower surface 54 abuts on the surface 55 of complementary shape.

In addition, can also see, still in the figure 7, if watched in the plane of the rear surface of Part I, the area of Part II is less than the area of Part I.(such) advantage is the flat surfaces contacted with the shank 14 of racket 12 or the lateral edges 22 of branch 18 is maximized, thus makes device firm.

According to a nonlimiting examples, the side surface 44 that (two) are relative is furnished with nonskid coating 56, thus prevents above-mentioned relative side surface from sliding relative to the inward flange 20 of the branch 18 of racket.

In addition, also can see, above-mentioned flat surfaces comprises slip-proof element 58.Especially but without limitation, the flat site 32a at least on the either side of side surface 44 being arranged in Part II 34 arranges slip-proof element 58.Can also see, slip-proof element 58 is arranged on the flat surfaces 32b of the bottom being positioned at Part I.

In fig. 2, the slip-proof element be positioned on flat surfaces 32 abuts on the lateral edges 22 of the branch 18 of racket 12, increases friction with this, thus slip-proof element 58 contributes to improving the confining force of shell relative to racket branch.

In Fig. 10, be understandable that, Part I 26 and Part II 34 comprise the recess being positioned at shell 24 inside.

According to Fig. 9 and Figure 10, can see, battery 36 is arranged in the recess 34a of Part II 34, and Part I can receive electronic circuit.The advantage of this non-limiting structure is to distribute the quality of this device, thus makes its center of gravity be positioned as close to the longitudinal axis of racket 12.

With reference to each accompanying drawing, can also see, Part I 26 and Part II 34 form an one piece component, and lid 29 forms an annex.

According to another embodiment, non-limiting and typically non-, device 10 comprises Part I and Part II, and this Part II stretches out from the rear surface of this Part I, and this device also comprises and the Part III of this Part I about the plane P symmetry of racket.This Part III is also connected to this Part II by rear surface.

Claims (22)

1. the measurement mechanism for racket (12) (10), described racket is equipped with shank (14), head (16) and has two branches (18) of inward flange (20) and lateral edges (22), the shank (14) of described racket (12) is connected to the head (16) of described racket by described branch (18), described device (10) comprises shell (24), and described shell comprises:

Part I (26), there are front surface (28) and rear surface (30), described rear surface has flat surfaces (32), described flat surfaces (32) is constructed at least to recline the lateral edges (22) of described branch (18), and

Part II (34), it stretches out from described rear surface (30), described Part II (34) is constructed to when described measurement mechanism (10) is installed on described racket (12), described Part II to be placed between two described branches (18) and to abut on described inward flange (20)

When described device (10) is installed on described racket (12), described shell (24) has the longitudinal direction (D) being parallel to described shank (14),

Described shell (24) comprises battery (36) and is electrically connected to the electronic circuit (38) of described battery (36),

It is characterized in that, along described longitudinal direction (D), described Part II has upper end (40), bottom (42) and relative side surface (44), the shape of described relative side surface is suitable for the inward flange (20) resting on described branch (18), the width of described Part II (34) reduces towards described bottom (42), and described flat surfaces (32) has two flat sites (32a), described two flat sites are arranged on the side of side surface (44) of described Part II (34) respectively, when described measurement mechanism (10) is installed on described racket (12), the shape of described flat site (32a) is suitable for the lateral edges (22) abutting in described branch (18).

2. device according to claim 1 (10), is characterized in that, the relative side surface (44) of described two the vertical described Part II of flat sites (32a) (34).

3. device according to claim 1 and 2 (10), it is characterized in that, along described longitudinal direction (D), described Part I (26) has top (26a) and bottom (26b), and described Part II (34) stretches out from the top (26a) of described Part I (26).

4. device according to claim 3 (10), it is characterized in that, the thickness (1e2) of the bottom (26b) of described Part I (26) is less than the thickness (2e1) on the top (26a) of described Part I (26).

5. the device (10) according to claim 3 or 4, it is characterized in that, along the longitudinal direction (D) of described shell, the length (L1) of described Part II (34) equals the half of the length (L2) of described shell (24) at the most.

6. the device (10) according to any one of claim 3 to 5, it is characterized in that, the width (l1) on described top (26a) is greater than the width (l2) of described bottom (26b), and the lateral edges of described shell (24) (46) is tilted relative to described longitudinal direction (D).

7. the device (10) according to any one of claim 3 to 6, it is characterized in that, described flat surfaces (32) has smooth lower area (32b), this lower area is positioned on the height of bottom (26b) of described Part I (26), the lateral edges (20) of described branch (18) and the shape of described lower area (32b) is suitable at least reclining.

8. device according to claim 7 (10), is characterized in that, the shape of described lower area (32b) is also suitable for reclining the top of described shank (14a).

9. the device (10) according to any one of claim 3 to 8, it is characterized in that, described device also comprises at least one fixed band (48), this fixed band rests in the top (26a) of described Part I (26) or at least one of bottom (26b), and when described device (10) be installed in described racket (12) upper time, described fixed band is intended at least on one of them or be fixed on the shank (14) of described racket of the branch (18) being fixed on described racket.

10. device according to claim 9 (10), it is characterized in that, described Part I (26) also comprise be arranged on described shell front surface (28) at least one ring (50a, 50b), in order to receive described fixed band (46).

11. devices (10) according to any one of claim 3 to 10, it is characterized in that, described electronic circuit (38) comprises at least one accelerometer (52) in the bottom (26b) being arranged at described Part I (26).

12. devices (10) according to any one of claim 1 to 11, it is characterized in that, in the plane of the rear surface of described Part I (30), the area of described Part II (34) is less than the area of described flat surfaces (32).

13. devices (10) according to any one of claim 1 to 12, it is characterized in that, described Part II (34) forms the block of rigidity, and two described relative side surfaces (44) are tilted relative to the longitudinal direction (D) of described shell (24).

14. devices according to claim 13 (10), is characterized in that, the described piece of lower surface (54) also had transverse to described flat surfaces (32) orientation, described lower surface (54) is rounded.

15. devices (10) according to claim 13 or 14, it is characterized in that, at least one surface (44) of described piece comprises nonskid coating (56).

16. devices (10) according to any one of claim 1 to 15, is characterized in that, described flat site (32a, 32b) at least one of them is provided with slip-proof element (58).

17. devices (10) according to any one of claim 1 to 16, it is characterized in that, along the direction perpendicular to described flat surfaces (32), the height (h) of described Part II (34) at least equals the half of the length (L2) of described shell.

18. devices (10) according to any one of claim 1 to 17, it is characterized in that, described electronic circuit (38) is placed in described Part I (26), and described battery (36) is placed in described Part II (34).

19. devices (10) according to any one of claim 1 to 18, is characterized in that, described Part II (34) and described Part I (26) form an one piece component.

20. devices (10) according to any one of claim 1 to 19, it is characterized in that, described Part II (34) is rigidity.

21. devices (10) according to any one of claim 1 to 20, it is characterized in that, described electronic circuit (38) and/or described battery (36) are placed in described Part II (34).

22. 1 kinds of rackets (12), be equipped with shank (14), head (16) and there are two branches (18) of inward flange and lateral edges, described shank is connected to described head by described branch (18), and the measurement mechanism (10) comprised according to any one of claim 1 to 21, wherein, described flat site is posted by the lateral edges of described branch, and wherein said Part II is placed between described two branches, makes the side surface of described Part II be placed in the inward flange of described branch.