Method and system for unlocking a calibratable electronic torque tool, torque tester, and torque tool

Description

[0001] The invention relates to a method for unlocking a calibratable electronic torque tool.

[0002] The invention also relates to a system for unlocking a calibratable electronic torque tool, a torque testing device and a torque tool.

[0003] Calibrable electronic torque tools, such as torque wrenches and torque screwdrivers, are widely used to tighten screws, nuts, and similar fasteners to a defined torque. When the defined torque is reached, this is indicated and / or a signal, such as a visual or acoustic signal, is emitted.

[0004] To ensure that the actual applied torque corresponds to the displayed or output torque of the torque tool, the torque tool must be calibrated. For calibration, torque tools are often brought to an approved calibration laboratory and readjusted or calibrated there using a calibration device. The torque tool is then affixed, for example, with a test seal to indicate that it is considered calibrated for a specified period of time.

[0005] However, it can happen that a tool is no longer correctly calibrated despite having a valid test seal. This can happen, for example, if the tool has been subjected to severe vibration, excessive stress, or excessive use after calibration. Using such a tool that is no longer correctly calibrated poses the risk of fasteners being tightened with the incorrect torque. This can result in workpieces becoming loose or damaged.

[0006] To prevent such damage, torque tools are known to be locked from further use after events occur that could affect the calibration. The lock is often only lifted after the tool has been recalibrated in a calibration laboratory. However, this calibration process is time-consuming, regardless of whether the calibration of the torque tool was actually affected by the event.

[0007] DE 20 2014 106 020 U1 discloses a calibration tool for a torque wrench, comprising a measuring head and a deflection lever. By deflecting the deflection lever, a torque can be applied to a calibration tool, and the applied torque can be measured to calibrate the torque wrench.

[0008] EP 3 795 954 B1 discloses a calibratable tool and a method for operating such a tool. A sensor measures external influences on the tool, and a calibration date is set to an earlier date if it is determined that a measured value of the external influence lies outside a specified range.

[0009] EP 2 096 425 B1 discloses an actuating device for calibrating torque wrenches. A torque wrench is fixed to a support of the actuating device, and a torque is applied to a head of the torque wrench to measure the torque acting on the torque wrench.

[0010] The object of the present invention is to facilitate the use of calibratable electronic torque tools and at the same time to ensure that no incorrectly calibrated torque tools are used.

[0011] This object is achieved by a method for unlocking a calibratable electronic torque tool, in particular a torque wrench or a torque screwdriver, the use of which is prevented by a lock, comprising the following steps: Coupling a tool head of the torque tool with a tool head holder of a torque testing device, Establishing a direct data connection between the torque tool and the torque testing device, Determining a testing device-side torque test value of the torque tool by means of a torque sensor of the torque testing device, Determining a tool-side torque test value of the torque tool by means of a torque sensor of the torque tool, Transmitting the tool-side torque test value to the torque testing device by means of the data connection, Comparing the tool-side torque test value with the test device-side torque test value by means of a data processing device that is integrated into the torque test device, generating an enable signal if a difference between the tool-side torque test value and the test device-side torque test value lies within a predetermined or predeterminable tolerance range, transmitting the enable signal to the torque tool via the data connection, enabling the torque tool by means of the enable signal by removing the lock, wherein the lock of the torque tool is only removed by the enable signal for a temporary period of time or a predeterminable or predefined number of usage cycles.

[0012] The lock prevents the use of the torque tool and is activated, for example, to prevent the torque tool from being used after an event that could affect its calibration. Previously, it was necessary to completely recalibrate the torque tool in a calibration laboratory after such an event. Advantageously, the method according to the invention now provides a significantly faster and simpler way of unlocking the torque tool. For this purpose, the torque testing device is used to determine whether a difference between the torque test value measured by the torque testing device and the torque test value measured by the torque tool itself lies within the tolerance range. If this is the case, the lock is released. If this is not the case, the torque tool must be recalibrated.

[0013] The lock can be activated and / or deactivated electronically. In particular, the lock is an electronic lock. The usability of the torque tool is blocked by the lock, in particular mechanically and / or electronically and / or magnetically. For example, the lock blocks the torque tool, making it impossible to tighten a fastener when the lock is activated. In particular, it additionally or alternatively indicates that the torque tool is blocked. According to another example, the lock causes the torque tool to rotate regardless of the applied torque.

[0014] A calibratable electronic torque tool is, in particular, a tool that has a tool head by means of which a torque can be exerted directly or indirectly on a fastener. The torque exerted by the tool head is measured and, in particular, displayed and / or output. In particular, the torque tool emits a signal when a defined torque is reached and / or prevents further tightening. For example, an audible, tactile, and / or visible signal, e.g., a click or crack, is displayed when the set torque is reached.

[0015] The tool head is, in particular, a part of the torque tool that is configured to engage a drive of a workpiece or to be coupled to an attachment that engages a drive of a workpiece. For example, the tool head engages a screw head drive or grips a nut. According to another example, an attachment is mounted on the tool head that engages the screw head drive or grips the nut.

[0016] The data connection is established directly between the torque tool and the torque testing device, without any detours via an additional device, such as a server. Specifically, the direct data connection is established via a transmitting and receiving device on the torque tool and a transmitting and receiving device on the torque testing device.

[0017] The torque testing device is particularly designed as a single piece. It is therefore, in particular, a single, compact device that can be coupled to the torque tool. This facilitates the implementation of the method. In particular, the torque testing device can be coupled to the tool directly via the tool holder or via an adapter in order to determine the torque test value on the test device side. In particular, the torque testing device comprises a housing, with the transmitting and receiving device and the data processing device integrated into the housing. The tool head holder is provided, in particular, on the housing.

[0018] The tolerance range is, in particular, + / - 2% to + / - 3% or up to + / - 1% of the test fixture-side torque test value. The test fixture-side torque test value indicates, in particular, the actual torque applied to the tool head, while the tool-side torque test value indicates the torque measured by the tool.

[0019] If the difference between the torque test value on the test device side and the torque test value on the tool side lies outside the tolerance range, no enable signal is generated and the torque tool remains locked. The torque tool can only be used again after recalibration. According to one embodiment, the torque test device is not configured to calibrate or recalibrate the torque tool. According to another embodiment, the torque test device is configured to automatically adjust the torque tool.

[0020] Preferably, the direct data connection is a wireless data connection, in particular a radio connection.

[0021] A wireless data connection is advantageous because it is particularly quick and easy to establish. For example, a direct data connection is a data connection via the Bluetooth standard.

[0022] The tool-side torque test value and the test device-side torque test value are preferably displayed on a display device of the torque test device, in particular simultaneously.

[0023] For example, the torque test values ​​are displayed side by side or one below the other. This makes it easier for a worker who wants to unlock the torque tool to check the calibration.

[0024] The lock of the torque tool is released by the release signal only for a temporary period or a predeterminable or predetermined number of usage cycles, whereby the duration of the temporary period is specifically specified or can be specified.

[0025] For example, the lock is lifted for a worker's shift, a workday, or a workweek, or the lock is lifted for 100 or 1,000 usage cycles. This ensures that the torque tool is correctly calibrated before use, thus preventing the use of an incorrectly calibrated tool.

[0026] The torque tool lock is activated in particular if a vibration sensor of the torque tool registers a vibration that exceeds a predeterminable or predetermined vibration limit.

[0027] If the torque tool is dropped or otherwise subjected to shock, it may no longer be correctly calibrated. In this case, the lock is activated to prevent work with an incorrectly calibrated tool. By checking the calibration using the torque tester, the lock can be released if it is determined that the calibration is still within the tolerance range despite the shock. Recalibration in a calibration laboratory is then no longer necessary.

[0028] In particular, the torque tool comprises an environmental parameter sensor, in particular a temperature sensor and / or a humidity sensor. The torque tool's lock is activated, in particular, if the environmental parameter sensor registers a measured value that exceeds a predeterminable or predefined limit value for the environmental parameter sensor.

[0029] Preferably, the torque tool lock is activated if the torque sensor of the torque tool registers a torque value that exceeds a predeterminable or predetermined torque limit.

[0030] If the tool is overloaded, for example, due to overtightening, the torque tool may no longer be correctly calibrated. In this case, the lock is preferably activated, which can be released again after a successful test using the torque test device.

[0031] In particular, the measured torque test values ​​and the relevant measurement parameters are stored in the torque testing device. Data, particularly the torque test values ​​and / or an evaluation of the torque test values, are transmitted to another device or a central quality management system. This is done, for example, for digital documentation. The evaluation may be a pass / fail assessment, i.e., an OK / NOK evaluation.

[0032] The object is further achieved by a system for enabling a calibratable electronic torque tool, in particular a torque wrench or a torque screwdriver, the use of which is prevented by a lock, wherein the system comprises the torque tool and a torque testing device, wherein the torque tool comprises a tool body, a tool head, a transmitting and receiving device and a torque sensor, wherein the torque testing device comprises a tool head holder, a transmitting and receiving device, a torque sensor and an integrated data processing device, wherein the tool head holder is designed to receive the tool head, wherein the transmitting and receiving device of the torque tool and the transmitting and receiving device of the torque testing device are designed toto establish a direct data connection between the torque tool and the torque testing device, wherein the torque testing device is configured to determine a test-device-side torque test value of the torque tool by means of the torque sensor of the torque testing device, wherein the torque tool is configured to determine a tool-side torque test value of the torque tool by means of the torque sensor of the torque tool and to transmit the tool-side torque test value to the torque testing device via the data connection, wherein the data processing device is configured to receive the tool-side torque test value and the test-device-side torque test value, to compare them with one another, and to generate an enable signal,provided that a difference between the tool-side torque test value and the test device-side torque test value lies within a predetermined or predeterminable tolerance range, wherein the data processing device is further configured to transmit the release signal to the torque tool via the data connection, wherein the torque tool is configured to release itself by means of the release signal by removing the lock, wherein the lock of the torque tool is released by the release signal only for a temporary period or a predeterminable or predefined number of usage cycles.

[0033] The system embodies the same advantages, features, and properties as the previously described method for unlocking a calibratable electronic torque tool. The system is particularly designed to carry out the method according to one of the previously described embodiments.

[0034] The torque testing device comprises in particular a display device which is configured to display the tool-side torque test value and the test device-side torque test value, in particular simultaneously.

[0035] The torque tool preferably comprises a vibration sensor, wherein the torque tool is configured to activate the lock of the torque tool if the vibration sensor registers a vibration that exceeds a predeterminable or predetermined vibration limit value.

[0036] The torque tool is preferably configured to activate the lock of the torque tool if the torque sensor of the torque tool registers a torque value that exceeds a predeterminable or predefined torque limit.

[0037] The object is also achieved by a torque testing device comprising a tool head holder, a transmitting and receiving device, a torque sensor and an integrated data processing device, wherein the torque testing device is configured and / or designed to carry out the following method steps of the method according to one of the previously described embodiments: Establishing a direct data connection between the torque testing device and a torque tool by means of the transmitting and receiving device of the torque testing device, determining a tester-side torque test value of the torque tool by means of the torque sensor of the torque testing device after a tool head of the torque tool has been coupled to the tool head holder of the torque testing device, receiving a tool-side torque test value by means of the data connection, wherein the torque testing device is further configured to display the tool-side torque test value and the test device-side torque test value, in particular simultaneously, on a display device of the torque testing device and / or to carry out the following method steps Comparing the tool-side torque test value with the test device-side torque test value by means of the data processing device, generating an enable signal if a difference between the tool-side torque test value and the test device-side torque test value lies within a predetermined or predeterminable tolerance range, transmitting the enable signal to the torque tool via the data connection, wherein the lock of the torque tool is only lifted by the enable signal for a temporary period of time or a predeterminable or predefined number of usage cycles.

[0038] In other words, the torque testing device is designed to establish a data connection with a torque tool, to determine the testing device-side torque test value after coupling with the tool head, and to receive the tool-side torque test value from the torque tool.

[0039] According to one embodiment, the torque testing device comprises a display device configured and designed to display the tool-side torque test value and the test device-side torque test value, in particular simultaneously. The display device configured in this way allows the torque test values ​​to be compared at a glance.

[0040] In addition to or as an alternative to displaying the torque test values ​​on the display device, the torque test values ​​are compared with each other. If the difference is within the tolerance range, the enable signal is generated and transmitted to the torque tool. This allows the calibration of the torque tool to be checked quickly and easily and a torque tool lock to be released.

[0041] In particular, the torque testing device is designed to cooperate with a calibratable electronic torque tool in order to carry out the method according to one of the previously described embodiments.

[0042] Finally, the object is achieved by a calibratable electronic torque tool comprising a tool body, a tool head, a transmitting and receiving device and a torque sensor, wherein the torque tool is configured and / or designed to carry out the following method steps of the method according to one of the previously described embodiments: Establishing a direct data connection between the torque tool and a torque testing device by means of the transmitting and receiving device of the torque tool, determining a tool-side torque test value of the torque tool by means of the torque sensor of the torque tool, transmitting the tool-side torque test value to the torque testing device by means of the data connection, Receiving an enabling signal from the torque testing device via the data connection, enabling the torque tool by means of the enabling signal by removing a lock, wherein the lock of the torque tool is only removed by the enabling signal for a temporary period of time or a predeterminable or predetermined number of usage cycles.

[0043] The torque tester and the calibratable electronic torque tool embody the same advantages, features, and properties as the previously described method for unlocking a calibratable electronic torque tool and the previously described system for unlocking a calibratable electronic torque tool.

[0044] The calibratable electronic torque tool is particularly designed to interact with a torque testing device in order to carry out the method according to a previously described embodiment. The tool head of the calibratable electronic torque tool is particularly designed to be coupled to a tool holder of the torque testing device.

[0045] Further features of the invention will become apparent from the description of embodiments of the invention together with the claims and the accompanying drawings. Embodiments of the invention may incorporate individual features or a combination of several features.

[0046] Within the scope of the invention, features marked with "in particular" or "preferably" are to be understood as optional features.

[0047] The invention is described below, without limiting the general inventive concept, using exemplary embodiments with reference to the drawings, whereby express reference is made to the drawings for all details of the invention not explained in more detail in the text. They show: Fig. 1: a schematically simplified representation of a system for enabling a calibratable electronic torque tool, and Fig. 2: a schematically simplified representation of a display device of a torque testing device.

[0048] In the drawings, identical or similar elements and / or parts are provided with the same reference numbers, so that a repeated presentation is omitted.

[0049] Fig. 1shows a simplified schematic of a system 1 for activating a calibratable electronic torque tool 2. In the illustrated embodiment, the torque tool 2 is an electronic torque wrench. The torque wrench comprises a tool body 20 and a tool head 21, which is intended, for example, to grip in a screw head drive or to grip a nut or to receive an attachment which in turn grips the screw head drive or the nut. The torque tool 2 also comprises a display device 25 and operating elements 26, by means of which, for example, a torque currently acting on the tool head 21 can be displayed and / or a desired torque can be set. If, for example, nuts are to be tightened with a certain defined torque, this can be set using the operating elements 26.If the defined torque is reached, this is shown on the display 25 and / or signaled in another way, for example by a noise.

[0050] Inside the tool body 20, a torque sensor 22, a transmitting and receiving device 23, a data processing device 24 and a vibration sensor 29 are provided, which are Fig. 1 are shown with dashed lines to indicate that they are not usually visible from the outside. The position of these components within the torque tool 2 does not have to correspond to the Fig. 1correspond to the position shown. The torque applied to the tool head 21 or exerted by the tool head 21 is measured by means of the torque sensor 22. The data processing device 24 controls the sensors 22, 29, the transmitting and receiving device 23, and the display device 25, and receives and sends data and signals to the components of the system 1. The vibration sensor 29 can be used to determine whether the torque tool 2 has been subjected to a vibration that could impair calibration of the torque tool 2. Calibration of the torque tool 2 can also be impaired by other events, such as excessive torque acting on the tool head 21 or excessive use of the torque tool 2.

[0051] After a torque tool 2 has been exposed to such an event, it usually needs to be recalibrated in a calibration laboratory. Otherwise, there is a risk of working with an incorrectly calibrated torque tool 2. Therefore, torque tools 2 are often equipped with a lock that prevents the use of the torque tool 2 if there is a risk that it is no longer correctly calibrated. This lock can only be removed through recalibration. However, such calibration is time-consuming and labor-intensive.

[0052] To reduce this effort, the system 1 provides a torque testing device 4 in addition to the torque tool 2. The torque testing device 4 comprises a housing 40 on which a tool head holder 41, a display device 45, and operating elements 46 are provided. Furthermore, a torque sensor 42, a transmitting and receiving device 43, and a data processing device 44, which are shown with dashed lines, are arranged inside the housing 40.

[0053] To check whether the torque tool 2 is correctly calibrated, the tool head 21 is coupled to the tool head holder 41. Furthermore, a direct data connection 6 is established between the torque tool 2 and a torque testing device 4, specifically by means of the transmitting and receiving devices 23, 43. This data connection 6 is, for example, a wireless data connection 6 based on the Bluetooth standard.

[0054] A tool-side torque test value 47 is now measured using the torque sensor 22 of the torque tool 2. This tool-side torque test value 47 corresponds to the torque value output or displayed by the torque tool 2 when a predetermined torque is applied to the tool head 21. Furthermore, a test-device-side torque test value is determined using the torque sensor 42 of the torque test device 4, which corresponds to the predetermined torque actually applied to the tool head 21. Several pairs of tool-side torque test values ​​47 and test-device-side torque test values ​​48 for different predetermined torques can also be determined. The tool-side torque test value 47 is transmitted to the torque test device 4 via the data connection 6. The data processing device 44 of the torque test device 4 now compares the torque test values ​​47, 48.If the difference between the torque test values ​​47, 48 lies outside a tolerance range, for example, between 2% and 3% of the torque test value 48 on the test device side, the torque tool 2 is no longer correctly calibrated. In this case, the display device 45 of the torque test device 4 indicates, in particular, that the torque tool 2 needs to be recalibrated. If, however, the difference between the torque test values ​​47, 48 lies within the tolerance range, an enable signal is generated and transmitted to the torque tool 2 via the data connection. Upon receipt of the enable signal, the torque tool 2 removes a lock that prevented the torque tool 2 from being used after registering one of the aforementioned events.

[0055] Fig. 2shows a simplified schematic of the display device 45 of the torque testing device 4, after both the testing device-side torque test value 48 and the tool-side torque test value 47 are present in the torque testing device 4. In the illustrated embodiment, the test values ​​47, 48 are displayed next to one another on the display device 45. In this way, it can be determined at a glance whether the torque tool 2 is still correctly calibrated. A further separate device for displaying and evaluating the torque test values, for example an additional computer or server, can therefore be dispensed with. In this embodiment, the system 1 comprises only the torque tool 2 and the torque testing device 4. In the example shown, the tool-side torque test value 47 is 102 Nm, while the testing device-side torque test value 48 is 100 Nm.Thus, the tool-side torque test value 47 is 2% greater than the test fixture-side torque test value 48, which is within the tolerance given as an example.

[0056] Using the torque testing device 2, the calibration of the torque tool 2 can of course be checked even when the torque tool 2 is not locked. Thanks to the compact design of the torque testing device 2 and the clear display on the display device 45, the calibration can be checked at any time in the shortest possible time. List of reference symbols

[0057] 1System 2Torque tool 4Torque test device 6Data connection 20Tool body 21Tool head 22Torque sensor 23Transmitting and receiving device 24Data processing device 25Display device 26Control elements 29Vibration sensor 40Housing 41Tool head holder 42Torque sensor 43Transmitting and receiving device 44Data processing device 45Display device 46Control elements 47Tool-side torque test value 48Test device-side torque test value

Claims

1. A method for unlocking a calibratable electronic torque tool (2), in particular a torque wrench or a torque screwdriver, the use of which is prevented by a lock, comprising the following steps: - coupling a tool head (21) of the torque tool (2) to a tool head receptacle (41) of a torque testing device (4), - establishing a direct data link (6) between the torque tool (2) and the torque testing device (4), - determining a testing device-side torque test value (48) of the torque tool (2) by means of a torque sensor (42) of the torque testing device (4), - determining a tool-side torque test value (47) of the torque tool (2) by means of a torque sensor (22) of the torque tool (2), - transmitting the tool-side torque test value (47) to the torque testing device (4) by means of the data link (6), - comparing the tool-side torque test value (47) with the testing device-side torque test value (48) by means of a data processing device (44) which is integrated into the torque testing device (4), - generating an unlocking signal if a difference between the tool-side torque test value (47) and the testing device-side torque test value (48) lies within a specified or specifiable tolerance range, - transmitting the unlocking signal to the torque tool (2) via the data link (6), - unlocking the torque tool (2) by releasing the lock by means of the unlocking signal, wherein the lock of the torque tool (2) is released by the unlocking signal merely for a temporary period of time or a specifiable or specified number of use cycles.

2. The method according to Claim 1, characterized in that the direct data link (6) is a wireless data link, in particular a radio link.

3. The method according to Claim 1 or 2, characterized in that the tool-side torque test value (47) and the testing device-side torque test value (48) are displayed, in particular simultaneously, on a display device (45) of the torque testing device (4).

4. The method according to any one of Claims 1 to 3, characterized in that the duration of the temporary period of time is specified or can be specified.

5. The method according to any one of Claims 1 to 4, characterized in that the lock of the torque tool (2) is activated if a shock sensor (29) of the torque tool (2) registers a shock which exceeds a specifiable or specified shock limit.

6. The method according to any one of Claims 1 to 5, characterized in that the lock of the torque tool (2) is activated if the torque sensor (22) of the torque tool (2) registers a torque value which exceeds a specifiable or specified torque limit.

7. A system (1) for unlocking a calibratable electronic torque tool (2), in particular a torque wrench or a torque screwdriver, the use of which is prevented by a lock, wherein the system (1) comprises the torque tool (2) and a torque testing device (4), wherein the torque tool (2) comprises a tool body (20), a tool head (21), a transmitting and receiving device (23) and a torque sensor (22), wherein the torque testing device (4) comprises a tool head receptacle (41), a transmitting and receiving device (43), a torque sensor (42) and an integrated data processing device (44), wherein the tool head receptacle (41) is configured to receive the tool head (21), wherein the transmitting and receiving device (23) of the torque tool (2) and the transmitting and receiving device (43) of the torque testing device (4) are designed to establish a direct data link (6) between the torque tool (2) and the torque testing device (4), wherein the torque testing device (4) is designed to determine a testing device-side torque test value (48) of the torque tool (2) by means of the torque sensor (42) of the torque testing device (4), wherein the torque tool (2) is designed to determine a tool-side torque test value (47) of the torque tool (2) by means of the torque sensor (22) of the torque tool (2) and to transmit the tool-side torque test value (47) to the torque testing device (4) via the data link (6), wherein the data processing device (44) is designed to receive the tool-side torque test value (47) and the testing device-side torque test value (48), to compare them to one another, and to generate an unlocking signal, if a difference between the tool-side torque test value (47) and the testing device-side torque test value (48) lies within a specified or specifiable tolerance range, wherein the data processing device (44) is further designed to transmit the unlocking signal to the torque tool (2) via the data link (6), wherein the torque tool (2) is designed to be unlocked by releasing the lock by means of the unlocking signal, wherein the lock of the torque tool (2) is released by the unlocking signal merely for a temporary period of time or a specifiable or specified number of use cycles.

8. The system (1) according to Claim 7, characterized in that the torque testing device (4) comprises a display device (45) which is designed to display, in particular simultaneously, the tool-side torque test value (47) and the testing device-side torque test value (48).

9. The system (1) according to Claim 7 or 8, characterized in that the torque tool (2) comprises a shock sensor (29), wherein the torque tool (2) is designed to activate the lock of the torque tool (2) if the shock sensor (29) registers a shock which exceeds a specifiable or specified shock limit.

10. The system (1) according to any one of Claims 7 to 9, characterized in that the torque tool (2) is designed to activate the lock of the torque tool (2) if the torque sensor (22) of the torque tool (2) registers a torque value which exceeds a specifiable or specified torque limit.

11. A torque testing device (4), comprising a tool head receptacle (41), a transmitting and receiving device (43), a torque sensor (42) and an integrated data processing device (44), wherein the torque testing device (4) is designed and / or configured to carry out the following method steps of the method according to any one of Claims 1 to 6: - establishing a direct data link (6) between the torque testing device (4) and a torque tool (2) by means of the transmitting and receiving device (43) of the torque testing device (4), - determining a testing device-side torque test value (48) of the torque tool (2) by means of the torque sensor (42) of the torque testing device (4) after a tool head (21) of the torque tool (2) has been coupled to the tool head receptacle (41) of the torque testing device (4), - receiving a tool-side torque test value (47) by means of the data link (6), wherein the torque testing device (4) is further designed to display, in particular simultaneously, the tool-side torque test value (47) and the testing device-side torque test value (48) on a display device (45) of the torque testing device (4), and / or to carry out the following method steps: - comparing the tool-side torque test value (47) with the testing device-side torque test value (48) by means of the data processing device (44), - generating an unlocking signal if a difference between the tool-side torque test value (47) and the testing device-side torque test value (48) lies within a specified or specifiable tolerance range, - transmitting the unlocking signal to the torque tool (2) via the data link (6), wherein the lock of the torque tool (2) is released by the unlocking signal merely for a temporary period of time or a specifiable or specified number of use cycles.

12. A calibratable electronic torque tool (2), comprising a tool body (20), a tool head (21), a transmitting and receiving device (23), and a torque sensor (22), wherein the torque tool (2) is designed and / or configured to carry out the following method steps of the method according to any one of Claims 1 to 6: - establishing a direct data link (6) between the torque tool (2) and a torque testing device (4) by means of the transmitting and receiving device (23) of the torque tool (2), - determining a tool-side torque test value (47) of the torque tool (2) by means of the torque sensor (22) of the torque tool (2), - transmitting the tool-side torque test value (47) to the torque testing device (4) by means of the data link (6), - receiving an unlocking signal from the torque testing device (4) via the data link (6), - unlocking the torque tool (2) by means of the unlocking signal by releasing a lock, wherein the lock of the torque tool (2) is released by the unlocking signal merely for a temporary period of time or a specifiable or specified number of use cycles.