ES2556883T3 - Tightening tool and its procedure - Google Patents

Abstract

Clamping tool that includes: - a clamping handle (1) having a longitudinal X direction, - a plurality of interchangeable actuating parts each suitable for rotating a clamping member, - a part (23) of the configured drive for transmitting a torque exerted from the handle (1) so that a tightening occurs on a drive piece between the plurality of interchangeable drive parts, - a torque determining device, characterized in that the plurality of interchangeable drive parts comprises at least a first drive part configured to rotate the clamping member in rotation according to a direction parallel to the longitudinal X direction and at least a second drive piece configured to rotate the clamping member in a second direction different from the direction longitudinal and because it includes detection means of the direction of the pair.

Description

5

10

fifteen

twenty

25

30

35

40

Four. Five

fifty

55

DESCRIPTION

Tightening tool and its procedure

The present invention relates to a tightening tool according to the preamble of claim 1 which allows the fixing, in particular by screwing, of any mechanical organ. It could be typically screws or bolts.

The invention also relates to a method of determining the torque during a tightening according to the preamble of claim 14. Such a tool and such a method are known from EP 1 022 097 A2.

Technological background

Document FR-A1-2 843 326 shows a torque wrench comprising an elastically deformable body and carrying two extensometers arranged at different distances from the tightening axis and connected in a Wheatstone bridge circuit and signal processing means from the two extensometers in order to determine the value of the tightening torque. According to this document, the elastically deformable body can be connected to different extensions in order to ensure both an extension of the high torque measurement and high measurement accuracy. In addition, the two different locations of the extensometers allow the determination of the bending torque at two different points in order to obtain the distance between the position of the hand on the key and the screw shaft.

A drawback of the torque wrench described is that a precise tightening with a reduced torque cannot be ensured, caused by the weight of the key lever itself that applies a force on the key grip and also transmits a torque to the element of fixation.

Another drawback, possibly linked to the previous one, is that this torque wrench offers nothing more than a configuration of use in which the grip of the key and the screwed axis form an angle of 90 °.

The invention allows the inconvenience of existing techniques to be remedied in whole or in part and proposes in particular a clamping tool according to claim 1, the range of which is extended in relation to the prior art. In particular, the invention allows one screw at the same time in the form of a wrench and in the form of a screwdriver, while a determination of the tightening torque in these two modes of operation can be ensured thanks to a detection of the torque direction.

Another objective of the present invention is to provide the user with the possibility of maneuvering or by rotating around his own longitudinal axis referred to as "x" in the subsequent representations of this document, making it coincide with the main axis of the fixing element around which this must rotate to ensure the screwing, or by pivoting the invention perpendicularly to the main axis of the fixing element and performing the rotation intended to exert the tightening torque around the main axis, referred to as "z" in the subsequent representations of this document, of the fixing element.

To this is added a device for determining the torque, advantageously with electronic means that allow the measurement of the tightening torque and the measurement of the tightening angle in the two working directions using removable extensions of different lengths, and the automatic detection of said extensions or using fixed extensions in order to adapt the processing parameters and obtain an always faithful torque value whatever the drive organ used.

Summary of the invention

One aspect of the invention relates to a clamping tool that includes: a clamping grip having a longitudinal X direction, a plurality of interchangeable actuating parts each suitable for rotational actuation of a clamping organ, a part of the actuation configured to transmit a torque exerted from the handle so that a tightening occurs between a plurality of interchangeable actuators and a torque determination device, the plurality of interchangeable actuators comprises at least a first piece of drive configured to rotate the tightening device in rotation according to a direction parallel to the longitudinal X direction and at least a second drive piece configured to rotate the tightening body according to a second direction different from the longitudinal direction and why it includes a means of detecting the address cion of the pair.

According to another aspect of the invention, a method of determining the torque is presented during the tightening of a tightening body by means of a tightening tool that includes a clamping grip having a longitudinal X direction, a plurality of interchangeable drive parts each suitable for rotating a tightening organ, a part of the drive configured to transmit a torque exerted from the handle so that a tightening occurs on a drive piece between the plurality of interchangeable drive parts, procedure in the that a clamping tool is used in which the plurality of interchangeable drive parts comprises at least a first drive piece

5

10

fifteen

twenty

25

30

35

40

Four. Five

fifty

55

60

configured to rotate the tightening body in rotation according to a direction parallel to the longitudinal X direction and at least a second drive part configured to rotate the tightening body according to a second direction different from the longitudinal direction and because it includes: a stage of detection of the direction of the pair and a stage of calculation of the pair in which the calculation parameters are adapted according to the direction of the detected pair.

Brief introduction of the drawings

The drawings attached to this document are given by way of example and are not limiting of the invention. They represent only one way of carrying out the invention and will allow it to be easily understood.

- Figure 1 is a perspective view of a torque wrench according to the invention.

- Figure 2 is a longitudinal sectional view of the tool of the invention.

- Figure 3 shows an exploded view of a part of the tool handle.

- Figure 4 shows a housing part that can receive certain constituents of the invention.

- Figure 5 shows an embodiment of the deformable body.

- Figure 6 shows a suitable bushing to be part of a drive piece that illustrates signal processing steps.

- Figure 8 presents an alternative processing to that of Figure 7.

- Figure 9 shows an example of implanting the extensometer.

Detailed description

Before presenting in detail some non-limiting possibilities of carrying out the invention with reference to the drawings introduced in the present document above, some options that the invention can present individually or according to any combination are listed below.

- The device for determining the tightening torque comprises a first computer program for determining the torque applicable for the first drive piece and a second program for determining the torque applicable for the second drive piece, and the direction detection means of the torque are configured to provide the torque determination device with a first signal to detect a direction of the parallel parallel to the longitudinal direction and a second signal different from the first signal with the detection of a direction of the torque according to the second direction , the torque determination device is configured to apply the first determination program with the reception of the first signal and to apply the second determination program with the reception of the second signal.

- The actuation part includes a deformable body at least partly integrated in the internal volume of the handle and in which the determination device includes at least two extensometers located in different deformable body areas according to the longitudinal direction.

- The deformable body areas in which the extensometers are located have different transverse directions in the longitudinal direction.

- The two extensometers are configured to each provide a strain value (E1, E2) in a plane defined by the longitudinal direction and the second direction and in which the detection means are configured to detect, for deformation values, identical signs that correspond to a direction of the pair parallel to the longitudinal direction and to detect opposite signs that correspond to a direction of the pair according to the second direction.

- The deformable body comprises a first plane and a second plane parallel to each other and in which each extensometer comprises two pairs of sets of gauges arranged in different planes between the first plane and the second plane.

- Each set of gauges includes a first caliber and a second caliber symmetrically arranged at 45 ° around the longitudinal direction.

- Each set of gauges includes a first caliber and a second caliber arranged respectively according to the longitudinal x axis and perpendicular to the longitudinal x axis, the first and second calipers of the Wheatstone bridge extensometers being joined, so as to provide an indication of the deformation of the deformable body, and a third caliber oriented at 45 ° in relation to the first and second calipers, the third calipers being joined in two Wheatstone bridges so as to provide an indication of the deformation of the deformable body.

- The deformable body includes a longitudinal conduit for the transmission of electrical signals.

- Automatic means for detecting types of drive parts are configured to generate a different electrical signal for each type of drive piece, said electrical signal being transmitted in the direction of the determination device, from one distal end of the deformable body to the other. deformable body end through the duct.

- At least one of the drive parts includes a bushing that can be connected to the distal end of the deformable body, the bushing carrying an identification organ that has a specific resistance value and that closes an electrical detection circuit and cooperates with a sensor to form the means of automatic detection.

- The detection means comprise at least one of: an angle sensitive goniometer around

the longitudinal direction and around the second direction, a velocity sensitive gyroscope according to the longitudinal direction and the second direction, an acceleration sensitive accelerometer according to the longitudinal direction and the second direction.

- The torque determination device includes at least one electronic digital processing card that

5 comprises a processor and data storage means.

Figure 1 illustrates a part of the tool according to the invention. A handle 1 constitutes the apprehension part by the user. In the example, it comprises, distributed on its outer periphery, contact parts 4 that offer increased friction so as to avoid slipping during the manipulation of the tool. At its end shown on the left in Figure 1, the handle 1 receives a plug 3 that closes a lower space defined by a body 2 of the handle 1.

The longitudinal direction of the handle 1 is represented by the letter x and a transverse direction by the letter z. Figure 5 represents these directions in an orthogonal reference x, y, z.

On the opposite side of the plug 3 according to the longitudinal x direction, another part of the tool flows from the handle 1 in the form of an actuating part 23.

15 This is most visible in Figure 2 which reveals that part 23 is a distal end of a test body 14 through which a tightening torque, exerted from the handle 1, can be transmitted to a tightening organ. The drive part 23 includes a profile and dimensions adapted to the mechanical transmission of the torque to a drive piece. In Figure 2, a part of such a drive part is visible in the form of a bushing 24, also visible in Figure 6. A first end of the bushing 24 includes a cavity of coupling 26 in which it is possible insert another part (not shown) of a drive piece, while maintaining the torque transmission.

According to the invention, the tool cooperates with drive parts:

- one or a few drive parts for which the screw shaft of the tightening body is directed according to the longitudinal direction x. The tightening is then carried out with a “screwdriver” mode operation. May

25 there are several actuators of this type, mainly according to the connector of the tightening body or the

length of the part required for the application;

- one or more drive parts for which the screwed shaft (at the height, for example of a ratchet head) is oblique - very preferably orthogonal - to the longitudinal x-axis. The operation is then in key mode. Several of these pieces can be implemented, mainly according to the arm length of

30 lever required by the application to exert the necessary torque on the tightening body.

It is understood that in the first case above, the tool is requested in torsion around the x axis while it is requested in bending around an orthogonal axis at x (y or z) in the second case.

As indicated above, and as represented by figures 2 to 4, the body 2 of the handle 1 allows certain other components of the tool to be enclosed.

In the first place, a housing 7 is fixedly mounted (for example by means of screws) on the volume of the body 2 and has an elongated configuration that offers areas for placing the tool organs. At a proximal end, the housing 7 includes a location 58, configured to receive a feed 9 such as a baton of one or more components.

Advancing along the x-axis, the housing 7 then includes a location 10 for receiving the 40 processing means. The latter can comprise at least one processor and data storage means, mainly of the programming codes encoding calculation programs and parameterization data that allow different parameters to be applied to the data processing according to the type of drive piece and the direction of the pair (torsion or flexion). The processing means are advantageously contained in whole or in part on one or more electronic cards 11. This or these electronic cards 11 45 also advantageously present any interface element for the input and / or output of information to or from the processing means. Mainly, that interface can inject some information (signals) of detection of the direction of the pair or of the type of piece of drive. Preferably, the interface also allows the provision of visualization or audible information in the direction (wired or wireless) to a screen or a means of restoring sound.

50 Following the location 10 along the x-axis, the housing 7 includes a location 12 for connection to a deformable body 6. The latter is mainly visible in Figure 5. It has a connection part 13 suitable for insertion into location 12 and fixed to it (by screwing for example). It includes a test body 14 whose measurement function will be explained below, and subsequently a distal end at the height of which the actuation part 23 is made and which allows cooperation with the socket 24 of one of the pieces of drive The handle assembly 1, housing 7, deformable body 6 and drive piece is configured so as to allow the transmission of the torque exerted by a user to the tightening body. In this sense, the deformable body 6 is not deformable other than elastically and in

5

10

fifteen

twenty

25

30

35

40

Four. Five

fifty

reduced proportions, useful for measurements, but not significant in terms of loss of torque. With the exception of Empunadura 1, all these pieces are preferably metal.

It is at the height of the deformable body 6, and in particular in the area of the test body 14, in which suitable measurements are made that serve to determine the torque.

In the case of Figures 5 to 9, the body 6 comprises a section test body 14 smaller than the connection part 13 and the actuation part 23. This test body 14 is the place of a deformation during the application of a tightening torque. This deformation is due either to a twisting of the x axis, or to a flexion of the transverse axis at x. The test body 14 is preferably flat so that it defines two planes 15, 16 parallel between sf and the x axis. The test body 14 further comprises two successive sections 17, 18 according to the x-axis and of different areas in cross section, for example by forming a width reduction at the height of section 17.

Figure 5 schematizes the implantation of extensometers 19, 21, which can be of normal conception, at the height respectively of section 17 and section 18. Figure 9 shows in more detail these extensometers that each consist of four calibres of deformation of which a pair of gauges are mounted on a plane 15 and the second is mounted on the opposite plane 16, and each pair is composed of a strain gauge rotated 45 ° in relation to the longitudinal axis of the elastically deformable body and 90 ° in relation to the second caliber, and they are all advantageously connected in a Wheatstone bridge circuit in order to determine the deformation by location.

According to one variant, the extensions 17 and 18 each consist of a rosette of deformation gauges located on a plane and the opposite plane and containing three calibrated rotated 0 °, 45 ° and 90 ° and having longitudinal strain gauges and transverse connected in a Wheatstone circuit and the diagonal strain gauges in another Wheatstone circuit in order to obtain the longitudinal and diagonal deformation by location.

Figure 9 shows the first configuration with calibers 20, 22. The Wheatstone bridge structure is well known and is used here in a conventional manner. Resistive sensitive elements such as extensometers are connected in a known way, in a Wheatstone bridge circuit, translating the deformation of the elastically deformable body into a resistance difference. The bridge circuit is powered by electric power and controlled by electronic means of electronic cards 11.

This arrangement of gauges allows, by applying appropriate parameters for the type of drive piece, to determine the applied torque. The extensometers 19 and 21 associated with the means transported by the electronic card (s) 11 thus participate in the formation of a device for determining the value of the pair.

The processing means allow the determination of the value of the tightening torque as a function of the values M1, M2 from the strain gauges 19, 21.

These processing means preferably include digital means that have a processor such as a microcontroller, an analog to digital converter. The electrical signal x (representing for each strain gauge 19, 21 a measurement value m1, m2) is received in a normal amplifier of adequate design to increase the output level. An amplified X value is obtained at the amplifier output. This X value is injected into an analog to digital converter type converter to obtain a discrete value Xd that constitutes a representative numerical value of the electrical values from the extensometers 19, 21.

These numerical values Xd are received in the microcontroller for processing. At the output, the desired torque value is obtained.

According to a particular embodiment of the tool, the value of the obtained torque c is independent of the area of apprehension of the tool by the user.

Characteristically, this measurement independence is produced by the processing means considered in this case.

More precisely, there is a mathematical relationship between the signals emitted by the two extensometers 19, 21 (M1, M2 after the digital conversion) and the value of the sought pair.

This relationship can be written as follows:

C = a.M1 + b.M2 + c

In which C is the sought pair, M1 and M2 the digital values corresponding to the measured values of the extensometers 19, 21 and a, b and c constants.

It is easy to obtain the constants a, b, c during tool calibration.

For each drive piece, a triplet of these values can be determined that can be stored in the processing means, in a memory.

In this way, the torque determination program can be adapted so that the correct determination algorithm is formed in each case.

5 A table has thus been constituted in the memory comprising processing parameters that can be used by the microcontroller to determine the value of the C pair.

To the extent that the invention can be used both as a "wrench" and as a "screwdriver", it has the advantage of automatically detecting the direction of stress (torsion or flexion) so as to adapt the torque determination parameters. The tool can thus work at very different stress intervals and automatically adapt to the use made of it, without risk of error and with an optimum level of sensitivity in each type of tightening.

To this end, the invention comprises means of detecting the direction of the pair. Advantageously, these means produce different (signal) information according to the address and transmit the appropriate information to the processing means to apply the appropriate calculation mode.

15 According to one possibility, the two determinations are executed in parallel at each tightening and only the relevant result is presented to the user. The application of the computer program for this determination is understood to include the use of any algorithm encoded by any current means to form an executable code by a processing means such as a microcontroller. The two adapted programs, one for flexion, another for torsion, can be part of a single global program. The two programs can also be carried out based on a single program in which the parameters are simply adapted.

In a first embodiment outlined in Figure 7, the torque determination comprises the steps that follow and that include a possibility of detecting the direction of the torque:

- determination of the deformation by location 81 and 82 at the height of the extensometers 19, 21;

- comparison of the two deformations;

25 - if the second deformation is inconsistent, request for flexion;

- detection of the extension and assignment of the corresponding parameter to the detected extension;

- determination of the torque Mfn and Mfl2;

- calculation of the tightening torque C depending on the parameters of the extension and the two flexion pairs Mfn and

Mfl2;

30 - if the second deformation is of the same meaning, request for torsion;

- determination of torque Mfn and Mfl2;

- final indication of the tightening torque.

A variant consists of having a device sensitive to angular displacements or speeds or accelerations according to the x and transverse directions so that there is a supplementary or alternative indication of the direction of the torque. This corresponds to block 101 b.

In this second embodiment, represented in Figure 8, it is the sensitive device that constitutes the essential element in the direction detection. The torque determination procedure is then as follows:

- Determination of the direction of rotation around the longitudinal and transverse axis of the key using the angles

40 goniometer measurements (or other);

- determination of the request as a function of the rotation around one of the two axes;

- if the rotation is around the transverse axis of the key, request for flexion;

- detection of the extension and assignment of the corresponding parameter to the detected extension;

- determination of the torque Mfn and Mfl2 asking for the two bridge circuits that capture the deformations

45 longitudinal and transverse;

- calculation of the tightening torque C depending on the parameters of the extension and the two flexion pairs Mfn and

Mfl2;

- if the rotation is around the longitudinal axis of the key, request for torsion;

- determination of the torque Mt1 and Mt2 asking for the two bridge circuits that capture the diagonal deformations 50;

- calculation of the tightening torque C from the two torques Mt1 and Mt2;

- final indication of the tightening torque C.

The tool advantageously includes automatic detection means of the type of drive piece so that the processing parameters are adapted to the characteristics of the drive piece.

55 These detection means will allow, in the example of embodiment indicated above for the processing means, to determine which triplet of constants a, b, c has to be applied to the processing of the measurements,

5

10

fifteen

twenty

25

30

35

40

Four. Five

fifty

55

In addition to the indication of the direction of the pair.

In the case of Fig. 2, the drive piece (in this case at the height of the bushing 24) carries an identification organ 27 which allows it to be identified in relation to the other parts. In the example, the organ 27 is a resistive component that has a specific resistance value in relation to the organs 27 of other parts. The automatic detection of the drive part is carried out by placing the organ 27 in a circuit in an electrical detection circuit. The resistance value of the organ 27 will influence the electrical signal of the circuit and will allow deduction of the drive part used.

The contact of the organ 27 in the detection circuit is advantageously carried out without a complex connection system. In fact, in the example of Figure 2, the deformable body 6 has an internal conduit according to the longitudinal direction and which forms a transmission conduit 28 between the two ends of the body 6. Thus, by providing two cables in the conduit 28 electrical that flow into the end of the drive part 23, so that they come into contact with the organ 27 during coupling of the bushing 24, the detection circuit is closed by applying the specific resistance of the organ 27 to this circuit. On the other side of the circuit 28, the cables may for example be connected to a part of the detection circuit located on an electronic card.

It is not mandatory that all drive parts include an identification organ 27. Only certain of them can be equipped. For example, the drive parts usable in screwing (i.e. in a screwdriver function) generally do not need identification because their length is independent so that only the detection of a torque direction makes it possible to adapt the operation of the torque determining means , without the need for other parameters of the drive part.

The conduit 28 can be used for the transmission of other electrical signals.

The conduit 28 may serve the passage of the transmission cables of signals other than those indicated herein. For example, the control information of the means transported by the drive parts can be passed in the conduit 28. Depending on the application, the bushing and / or other part of at least one drive part may include a conduit, similar to conduit 28, to ensure continuity of the latter.

The body 6 is in this option the seat of an internal transmission of the detection signals.

In addition, the dynamometer set presented here can cooperate with a remote electronic presentation unit through advantageously wireless transmission means (in particular by radio waves). In this way, the user can read the pair's measurement directly on a separate screen without any limitation linked to eventual wired links.

To avoid any transmission interference, the transmission signals are encoded in a specific and characteristic way by means of a given code.

In this way, the reception is not disturbed by other eventual waves transmitted in the measuring air, particularly from other similar torque wrenches.

A start button is advantageously accessible to the user or the start can be controlled remotely. The invention is such that, by automatically detecting the direction of the pair, a potentially autonomous operation is ensured without any other user control other than the start.

The couplings used for the connection, with torque transmission, of the different components described can be in standardized formats according to ISO 3120 and ISO 1174 standards.

References

1. Punch

2. Pusher body

3. Cap

4. Contact part

5. Mouth

6. Deformable body

7. Accommodation

8. Feed location

9. Food

10. Location of electronic cards

11. Electronic card

12. Connection location

13. Connection part

14. Test body

15. Foreground

16. Background

17. First section

18. Second section

5 19. First extensometer

20. Probe of the first extensometer

21. Second extensometer

22. Probe of the second extensometer

23. Drive part

10 24. Cap

25. Drive cavity

26. Coupling cavity

27. Identification body

28. Transmission duct

fifteen

Claims (14)

5 10 fifteen twenty 25 30 35 40 Four. Five fifty 55 1. Tightening tool that includes: - a grip (1) of apprehension having a longitudinal X direction, - a plurality of interchangeable drive parts each suitable for rotating a tightening organ, - a part (23) of the drive configured to transmit a torque exerted from the handle (1) so that a tightening occurs on a drive part between the plurality of interchangeable drive parts, - a torque determination device, characterized in that the plurality of interchangeable drive parts comprises at least a first drive piece configured to rotate the tightening device according to a direction parallel to the longitudinal X direction and at least a second drive part configured to rotate the drive of tightening according to a second direction different from the longitudinal direction and because it includes means for detecting the direction of the torque. 2. Tool according to the previous claim in which: - the device for determining the tightening torque comprises a first computer program for determining the torque applicable for the first drive part and a second program for determining the torque applicable for the second drive part, and - the means for detecting the torque direction are configured to provide the torque determination device with a first signal after the detection of a torque direction parallel to the longitudinal direction and a second signal different from the first signal after the detection of a torque address according to the second address, - the torque determination device is configured to apply the first determination program upon receipt of the first signal and to apply the second determination program after receipt of the second signal. 3. Tool according to one of the preceding claims in which the actuating part includes a deformable body at least partly integrated in the internal volume of the handle and in which the determining device includes at least two extensometers (19, 21) located in different deformable body areas according to the longitudinal direction. 4. Tool according to the preceding claim in which the deformable body areas in which the extensometers (19, 21) are located have different cross-sectional sections to the longitudinal direction. 5. Tool according to one of the two preceding claims in which the two extensometers (19, 21) are configured to each provide a strain value (E1, E2) in a plane defined by the longitudinal direction and the second direction and in that the detection means are configured to detect, for deformation values, identical signs that correspond to a direction of the pair parallel to the longitudinal direction and to detect opposite signs that correspond to a direction of the pair according to the second direction. 6. Tool according to one of the two preceding claims in which the deformable body comprises a first plane (15) and a second plane (16) parallel to each other and in which each extensometer (19, 21) comprises two pairs of sets of gauges (20, 22) arranged in different planes between the first plane (15) and the second plane (16). 7. Tool according to the preceding claim in which each set of gauges includes a first caliber (20) and a second caliber (22) symmetrically arranged at 45 ° around the longitudinal direction. 8. Tool according to claim 6 in which each set of gauges includes a first caliber (20) and a second caliber (22) arranged respectively according to the longitudinal x axis and perpendicular to the longitudinal x axis, the first and second calipers being joined the extensometers (19, 21) in Wheatstone bridge, so as to provide an indication of deformation of the deformable body (6), and a third caliber oriented at 45 ° in relation to the first and second calipers, the third gauges being joined in two Wheatstone bridges so as to provide a torsion indication of the deformable body. 9. Tool according to one of claims 3 to 8 wherein the deformable body includes a longitudinal conduit (28) for transmission of electrical signals. 10. Tool according to the preceding claim comprising means for automatic detection of types of drive parts configured to generate a different electrical signal for each type of drive parts, said electrical signal being transmitted in the direction of the determining device, from one end distal of the body (6) deformable to the other end of the body (6) deformable through the duct (28). 5 10 fifteen twenty 25 11. Tool according to the preceding claim in which at least one of the drive parts includes a bushing (24) that can be connected to the distal end of the deformable body, the bushing (24) carrying an identification organ (27) having a specific resistance value that closes an electrical detection circuit, which cooperates with a sensor to form the automatic detection means. 12. Tool according to one of the preceding claims in which the detection means comprise at least one between: an angle sensitive goniometer around the longitudinal direction and around the second direction, a velocity sensitive gyro according to the longitudinal direction and the second direction, an accelerometer sensitive to accelerations according to the longitudinal direction and the second direction. 13. Tool according to one of the preceding claims wherein the torque determining device includes at least one electronic digital processing card (11) comprising a processor and data storage means. 14. Torque determination procedure during a tightening of a tightening body by means of a tightening tool that includes: - a grip (1) of apprehension having a longitudinal X direction, - a plurality of interchangeable drive parts each suitable for rotating a tightening organ, -a part (23) of the drive configured to transmit a torque exerted from the handle (1) so that a tightening occurs on a drive part between the plurality of interchangeable drive parts, characterized in that: the clamping tool is used in which the plurality of interchangeable drive parts comprises at least a first drive piece configured to rotate the clamp according to a direction parallel to the longitudinal X direction and at least a second drive piece configured to rotate the tightening body according to a second direction different from the longitudinal direction and because it includes: - a stage of detecting the direction of the pair - a step of calculating the torque in which the calculation parameters are adapted according to the direction of the detected torque.