DE202004017253U1 - Rotary tool, especially torque wrench, has display unit with separate displays for indicating torque and rotary angle - Google Patents

Abstract

The tool has a display unit (5) for the torque and rotary angle, comprising a screen (8) with a numerical display (9) for indicating the torque, a numerical display (10) for indicating rotary angle and a bar display (11) for indicating a transferred torque and then once an adjustable given torque value is reached it switches to indicating the rotary angle.

Description

The The invention relates to a turning tool, in particular a torque / angle key, with a handle, a shank and a tool head and one Display unit for visualizing a torque and an angle of rotation.

In many use cases assembly technology, for example in automobile construction and the like especially safety-relevant applications, screw connections a certain preload force is tightened. After reaching a preset torque, the screw connection becomes Ensuring the preload further by a certain angle turned. In this context one speaks of a rotation angle controlled Tightening.

Electronic torque / angle of rotation keys are known for such applications, for example by EP 0 925 155 B1 or the DE 203 15 000 U1 , The known torque / angle of rotation keys have a display unit for visualizing a torque and an angle of rotation. An LED display made of light-emitting diodes indicates when limit values for torque or angle of rotation are reached or exceeded. Final values, but also instantaneous values of torque or angle of rotation are shown on an LCD display. However, the display of the individual measured values appears to be in need of improvement with regard to the transmission of information or the representation, the clarity and the ergonomics.

The The invention has for its object a torque tool, in particular a torque / angle key to create with an improved display unit, which is particularly clear and practical presentation of readings during the handling of the turning tool.

The solution this object consists according to the invention in a turning tool according to the characteristics of protection claim 1.

After that the display unit of the turning tool has a screen with a 1st numerical display for a torque and a second numerical one Ad for an angle of rotation. There is also a bar display of the torque and / or the angle of rotation provided, wherein at the Bar display shows the actual value of one with the turning tool transferred to a screw connection Torque occurs and after reaching an adjustable torque setpoint there is a change from the torque display to the rotation angle display. The change from the torque display to the rotation angle display on the The bar is displayed automatically or automatically when the set one is reached Target value for the torque. It then becomes the actual value of the angle of rotation up to Reaching a predefinable target value is displayed.

The The respective target values can be reached by a separate signal approved become. That way the user optically and / or acoustically real-time documentation the screw tightening he made and a confirmation, that the work is done properly.

The Design according to the invention the display unit is regarding the presentation of the respective measured values of torque and angle of rotation clearly and ergonomic. The torque value is shown in the 1st numerical display displayed. For the second numerical display is provided to show the angle of rotation. While handling is initially shown on the bar display building torque as actual value in real time. The representation in the bar display is fluent or in steps like a line scale. When reaching one before set target value for the joining moment there is a change on the bar display from the torque display for rotation angle display. The change of the bar graph from torque the rotation angle is displayed automatically or automatically after reaching it of the joining moment. The user can read the angle of rotation directly on the bar display without that for this manual switching is required. At the same time in the numerical displays the respective applied values for the torque and the angle of rotation as a control variable and minimal or maximum values documented.

Each Documentation can also be carried out after a screwing process the screen shows whether the screwing process was OK and the prescribed torque and angle of rotation values have been reached are or not.

The turning tool according to the invention is microprocessor controlled and is particularly suitable for static and dynamic measurement of torque and angles of rotation for screw connections. The Angle of rotation measurement is carried out without reference arm. Screw connections that are designed for the corresponding torque or angle of rotation specifications, can assembled or checked with the turning tool as well as disassembled. When disassembling takes place over the display unit documents the breakaway torque.

in the Turning tools are the necessary electrical and electronic Components such as sensors and evaluation modules for the acquisition, evaluation and Display of the torques and transmitted with the turning tool Integrated angle of rotation.

advantageous Refinements and developments of the turning tool according to the invention are Subject of the dependent Protection claims 2 till 9.

advantageously, are control panels for setting on the screen of the display unit of torque and / or angle of rotation values. About the Control panels can the required target values of torque or angle of rotation are set become.

Also if basically an external on or off switch for the display unit is possible it is considered advantageous within the scope of the invention if the on / off switch is also integrated in the screen. There is a corresponding one Control panel provided on the screen.

advantageously, comes a screen with touch panels a so-called touch screen. Here the control panels by touch their surface operated on the screen.

Conveniently, a voltage display is also provided on the screen via which the user an image about the energy status of a voltage source integrated in the turning tool can make.

The The target values of torque and / or angle of rotation are reached displayed by a signal generator. This can be visual or done acoustically. Furthermore, the use of a vibration signal transmitter possible. Incorrect handling of the turning tool, where the prescribed If the target values are not reached, a corresponding one can be used Warning signal from a signal generator can be displayed.

Appropriately, however, not mandatory, the display unit is an integral part of the turning tool. As a torque / angle key this one handle and an adjoining lever tube, a tool head is provided at the end. The tool head can be fixed or replaceable on the lever tube. At a such a turning tool, the display unit on the shaft side is appropriate Integrate end of the handle.

The display quality as well as readability and thus overall the ergonomics of the turning tool can be improved if the bar display is curved in an arc. To this In this way, the measured values shown are displayed by the user during the Handling well perceived.

All in all leads the Design according to the invention the display unit to ensure that the respective target values are reliable, however also sensitive can be achieved because the screwing process or the increasing torque and the angle of rotation visually through the changing bar display is displayed in the manner of a running ad. The user has so direct information about how it approaches the target values. This improves the accuracy and quality of the screw connection.

On this can make a further contribution to improving ergonomics when the screen is relative to that through the tool head extending central transverse plane is arranged inclined. The screen is so with a turning tool attached to a screw connection Tilted user and is in its easily visible Field of view. This measure too contributes to improvement the readability and the accuracy of the work carried out at.

The The invention is described in more detail below using an exemplary embodiment. Show it:

1 a turning tool according to the invention in a plan view;

2 a view of the shaft end of the handle according to the arrow A in the 1 and

3 to 5 each a view of the handle of a turning tool according to the invention in three different handling situations.

1 shows a turning tool according to the invention 1 in the form of a torque / angle of rotation key.

The turning tool 1 has a lever tube 2 with one hand 3 as well as a tool head 4 and a display unit 5 for the visualization of torque and angle measurements. The tool head 4 is with the lever tube 2 interchangeably connected and in the illustrated embodiment as a reversible ratchet 6 executed.

The display unit 5 is at the shaft end 7 of the handle 3 arranged and can be an integral part of the handle 3 be (see also 3 to 5 ).

The display unit 5 has a screen 8th with a 1st numerical display 9 for a torque and a 2nd numerical display 10 for a rotation angle. There is also a bar display 11 intended. You can see that the bar display 11 arcuate and extends from the lower left corner to approximately the upper right corner of the screen 8th extends.

At the screen 8th is a touch screen with control panels 12 . 13 for touch input. By touching the surface of the control panels marked with arrows 12 . 13 target values for torque or angle of rotation can be set. According to the arrow marking, the control panel 12 an increase in the respective value, whereas on the control panel 13 there is a reduction in a torque or angle of rotation value.

On the screen 8th is also a control panel 14 for switching the display unit on or off 5 intended. The control panel 14 is also operated via touch input.

Based on the representations of the 3 to 5 can also be seen on the screen 8th a voltage indicator 15 as well as pictogram displays 16 . 17 . 18 , which can be used to display the type of a measured value and a property of the same.

The pictogram display 16 indicates a torque measurement. The pictogram display 17 visualizes the implementation of an angle measurement, whereas the pictogram display 18 indicates the property of a measurement carried out, namely whether it was OK (= OK) or not OK (= NOK).

On the display unit 5 are also signal generators 19 . 20 provided for optical or acoustic signaling that a predetermined target value has been reached. This can also be designed, for example, so that the signal transmitter during an active measurement 20 lights up red and there is a change when a predetermined target value is reached and then the signal generator 19 lights up green.

In the 1 is the central transverse plane of the tool head 4 marked with MQE. The central longitudinal axis L of the ratchet wheel runs perpendicular to the central transverse plane MQE 21 of the tool head 4 or the reversible ratchet 6 , Based on 2 it becomes clear that the screen 8th relative to that through the tool head 4 extending central transverse plane MQE is arranged inclined. This is the screen 8th when using the torque / angle key 1 with a tool head attached to a screw connection 4 inclined towards the user, which improves handling and readability. In the illustrated embodiment, the angle of inclination α is 45 °.

For a rotation angle-controlled screw tightening, the target values of torque and rotation angle are set via control panels 12 and 13 entered. In the based on the 3 to 5 In the example explained, these are a target value of 160 Nm for the torque and a target value of 140 ° for the angle of rotation. Then the torque / angle of rotation key 1 attached to the screw connection. When actuating the torque / angle of rotation key 1 the screw is turned and a torque is transmitted. The torque is displayed as in 3 shown in the 1st numerical display 9 as well as in parallel on the bar display 11 , In the example shown, the actual value of the torque is 100 Nm. The pictogram display 16 indicates that a torque measurement is being carried out. An active measuring process is also indicated by a display 22 signals that display the word "MEASURE".

When the set target value of 160 Nm is reached, this is signaled by the signal generator 19 visually displayed. At the same time, the bar display changes 11 automatically the torque display for the rotation angle display. The torque / angle of rotation key 1 must now be rotated further by the specified target value of the angle of rotation in order to give the screw connection a defined pretensioning force. The actual value of the angle of rotation is shown on the 2nd numerical display 10 as well as in parallel on the bar display 11 shown. This can be seen in the 4 , whereby an angle of 140 ° has already been reached, with which the target value is reached. The angle of rotation measurement is shown by the pictogram display 17 clarified. The current torque is used as a control variable during the rotation angle measurement in the 1st numerical display 9 shown.

Proper screwing is indicated by an optical or acoustic signal on the signal generator 19 . 20 as well as through the pictogram display 18 signaled as "IO".

The procedure described below is also possible, for which a corresponding screwing program can be selected. For the description also refer to the 3 to 5 Referred.

A value of 100 Nm is specified for the joining torque. The angle of rotation should be 140 °, with a final torque value of 155 Nm to 165 Nm. The corresponding values for torque and angle of rotation are from the An entered and the screwing process is carried out.

After reaching the selected joining torque of 100 Nm, as in the 3 in the 1st numerical display 9 and on the bar display 11 the rotation angle measurement starts at 0 ° and runs up to the selected rotation angle of 140 °. This is in the 4 in the 2nd numerical display 10 just like in the bar display 11 to recognize. In parallel, the torque measurement continues and is shown in the 1st numerical display 9 brought to the display. You can see this in both 4 and 5 , When the screwing process is complete, the completed angle of rotation is displayed at 140 °. The current torque value of 160 Nm is in the 1st numerical display 9 shown. The message IO in the pictogram display 18 according to the 5 signals that the specified values have been reached because after reaching the specified joining torque of 100 Nm as the starting point and continuing the screwing movement by 140 °, a final torque value of 160 Nm was reached, which is in the specified range between 155 Nm and 165 Nm ,

1

turning tool

2

lever pipe

3

handle

4

tool head

5

display unit

6

ratchet

7

End of v. 3

8th

screen

9

1. numerical display

10

Second numerical display

11

Bar display

12

Control panel

13

Control panel

14

Control panel

15

voltage display

16

Icon display

17

Icon display

18

Icon display

19

signaler

20

signaler

21

Ratchet wheel v. 6

22

display

MQL

Middle transverse plane

L

Longitudinal axis v. 22

α

tilt angle

Claims (9)

Turning tool, in particular torque / angle wrench, with a handle ( 3 ), a lever tube ( 2 ) and a tool head ( 4 ) and a display unit ( 5 ) for visualizing a torque and an angle of rotation, the display unit ( 5 ) a screen ( 8th ) with a 1st numerical display ( 9 ) for the torque and a 2nd numerical display ( 10 ) for the angle of rotation as well as a bar display ( 11 ) is provided to represent the torque and / or the angle of rotation, with the bar display ( 11 ) the actual value of a transmitted torque is displayed and, after reaching an adjustable target value for the torque, there is a change between the torque display and the rotation angle display. Turning tool according to claim 1, characterized in that in the screen ( 8th ) Control panels ( 12 . 13 ) are arranged for setting torque values and / or rotation angle values. Turning tool according to claim 1 or 2, characterized in that in the screen ( 3 ) a control panel ( 14 ) to switch the display unit on or off ( 5 ) is provided. Turning tool according to claim 2 or 3, characterized in that the control panels ( 12 - 14 ) can be operated by touching the screen surface. Turning tool according to one of claims 1 to 4, characterized in that in the screen ( 8th ) a voltage display ( 15 ) is provided. Turning tool according to one of claims 1 to 5, characterized in that in the display unit ( 5 ) at least one signal generator ( 19 . 20 ) is integrated. Rotary tool according to one of claims 1 to 6, characterized in that the display unit ( 5 ) at the shaft end ( 7 ) of the handle ( 3 ) is arranged. Turning tool according to one of claims 1 to 7, characterized in that the bar display ( 11 ) runs in an arcuate curve. Rotary tool according to one of claims 1 to 8, characterized in that the screen ( 8th ) relative to that through the tool head ( 4 ) extending central transverse plane (MQE) is inclined.