EP2896484B1 - Releasing torque tool comprising an adjusting device - Google Patents

Description

Technical area

1. a) ein schaftartiges Gehäuse mit einem Griffbereich und einem Kopfbereich,
2. b) eine Übertragungsanordnung in dem Gehäuse zur Übertragung des Drehmoments,
3. c) eine Stellvorrichtung mit einem Stellknopf zum Einstellen eines gewünschten Drehmoments, bei dem das erreichte Drehmoment signalisiert wird,
4. d) eine Anzeige zum Anzeigen eines Drehmomentwerts, bei dem das Drehmomentwerkzeug auslösen soll,
5. e) einen Auslösemechanismus, mit dem das Drehmomentwerkzeug beim eingestellten Drehmoment ausgelöst,
6. f) der Stellknopf der Stellvorrichtung zur Blockierung der Einstellung entfernbar ausgebildet ist.

The invention relates to a triggering torque tool containing

1. a) a shaft-like housing with a grip area and a head area,
2. b) a transmission arrangement in the housing for transmitting the torque,
3. c) an adjusting device with an adjusting button for setting a desired torque at which the torque achieved is signaled,
4. d) a display for displaying a torque value at which the torque tool is to trigger,
5. e) a trigger mechanism with which the torque tool is triggered at the set torque,
6. f) the adjusting button of the adjusting device for blocking the setting is designed to be removable.

The invention further comprises an adjusting device for a triggering torque tool with a base body and an adjusting button for setting a desired torque, at which the achieved torque is signaled and the adjusting button for blocking the setting is removably provided on the base body of the adjusting device.

description

The screw connection is the most frequently used connection in mechanical engineering. Such fasteners can only be effective through the use of suitable assembly tools. The assembly tools suitable for this include torque tools, as mentioned above. Torque tools are needed to apply a certain torque to a workpiece. Torque wrenches or torque screwdrivers, for example, are known as torque tools. In particular, there are indicating and triggering torque tools. Indicating torque tools always show the current torque. A target torque is set for triggering torque tools. As soon as this torque is reached when a screw connection is tightened, the torque tool signals to a user that the target torque has been reached. This can be signaled, for example, by an audible click or a palpable crack.

The torque to be transmitted when using hand-held tools depends on the physical constitution of the user as well as his subjective feeling of strength dependent. Torque tools are used to load a screw with a high preload force that lies in the elastic range of the screw or to load the screw with only low preload forces. The use of new construction materials such as magnesium, aluminum or plastic, especially for lightweight construction in the automobile or aircraft industry, increases both the demand and the requirements for torque tools. These new materials increase the number of sensitive screw connections. The lower tensile strength of these lightweight materials compared to steel materials would lead to damage to the thread if the screw connection were overloaded, which would make these expensive components unusable.

State of the art

In some versions, triggering torque tools are set to a specific torque value at which they are to trigger using a rotary knob. The rotary knob is pulled axially out of a shaft of the torque tool, which unlocks the rotary knob. The torque value at which the torque tool is to trigger is always visible on a main scale and, if necessary, a fine scale. The setpoint for triggering the torque tool can now be set by turning the rotary knob. The rotary knob is then locked by pushing it back into the shaft. It engages in a toothing and is thus secured against unintentional adjustment. The user can set a different torque setpoint by unlocking the rotary knob.

In the DE 20 2011 050 280 U1 describes an adjustable torque wrench with a tool drive part. The torque tool there has a tubular tool shank which extends in its longitudinal direction. On A handle is arranged in a first end section and is mounted on the tool shaft so as to be rotatable about the longitudinal axis. The handle is directly or indirectly coupled to a clamping unit inside the handle and / or tool shaft. By turning the handle, a spiral spring is tensioned or relieved, via which the respective tightening torque to be applied is preset. The handle also has a folding lever which, in its rest position, rests against the handle. In a transition area between the tool shaft and the handle, a scale is arranged which can have numerical information about the currently set tightening torque. The transition area is tapered compared to the tool shank, whereby it is reduced in its cross section. A second end section of the tool shank opposite the first end section is used for coupling with a tool drive part, which is used to hold tools, usually plug-on tools.For this purpose, the tool shank, which is otherwise circular in cross-section, is flattened at its second end section so that a rectangular opening is formed at the end .

From the German Offenlegungsschrift DE 100 51 011 A1 a triggering torque wrench is known which records the torque electronically. The mechanical torque is converted into an electronic signal with a strain gauge. The torque recorded in this way is compared with a target value. If the measured torque reaches the set or specified torque target value, the electronic evaluation of the torque wrench is mechanically released at least for a short time. The release takes place here, for example, by decoupling the key handle and key head.

From the DE 10 2006 013 147 A1 a torque tool is known for measuring and / or for triggering tightening of a torque on a workpiece. The torque tool includes a housing with a handle and a rod for transmitting the torque. A measuring element is used to electronically record the Torque, which is processed by measuring and control electronics. A trigger switch controlled by the electronic measuring and control electronics triggers the torque tool when a target value is reached. The torque wrench described there has a reduction mechanism which has at least one actuator operated by the trigger switch. The reduction mechanism is arranged between the rod for transmitting the torque and the electronically controlled trigger switch for triggering the torque tool. In this document it is described that the reduction mechanism contains a switching lever with a switching edge, which is controlled by the electronically controlled trigger switch.

In the GB 1 323 341 discloses a triggering torque wrench with a housing. A transmission arrangement for transmitting a torque is provided in the housing. A rotatable adjusting cap is arranged at its handle end. The adjustment cap actuates an adjusting screw with which a torque is set at which the torque wrench is to trigger.

The U.S. 3,132,548 describes a torque wrench with a shaft-like housing and a transmission arrangement in the housing for transmitting a torque. A grip sleeve is rotatably provided. The grip sleeve actuates an adjusting screw to set a torque. The inside of the grip sleeve contains an adjusting pin which actuates an adjusting screw for setting the triggering torque. The adjusting screw is actuated by turning the grip sleeve, whereby the grip sleeve slides telescopically over the housing.

If the torque tool is only to be used for a specific operation, it is set to a fixed torque value in the magazine. The disadvantage of the known torque tools is that the triggering torque can be accidentally or deliberately adjusted by a user can. However, this can no longer guarantee that a preset torque was actually present.

Disclosure of the invention

The object of the invention is to eliminate the disadvantages of the prior art and to create a torque tool or adjusting device for a torque tool of the type mentioned at the outset, which prevents the triggering torque from being accidentally or intentionally adjusted.

• g) ein Rastmechanismus vorgesehen ist, mit dem die Stellvorrichtung auf ein eingestelltes Drehmoment arretiert wird.

According to the invention, the object is achieved in that in a triggering torque tool of the type mentioned above

• g) a locking mechanism is provided with which the adjusting device is locked to a set torque.

Furthermore, the object is achieved by an adjusting device for a triggering torque tool with an adjusting knob for setting a desired torque, in which the adjusting knob is removably provided on the base body of the adjusting device of the type mentioned, a latching mechanism being provided for locking a set torque.

If the torque tool is only to be used for a specific operation, it is set to a fixed torque value by authorized persons in the tool store or magazine. An adjustment of the set Torque value by the user is often not desired in order to always securely tighten a given screw connection.

In order to block the setting, the setting button can be removed in the present invention after the setpoint for the triggering torque has been set. This means that it is no longer possible for the user to adjust the setpoint that has been set for the triggering torque.

The locking mechanism ensures that the set target value for the triggering torque locks into place. This in particular prevents the setpoint from changing independently. The target value for the triggering torque can only be adjusted by releasing or overcoming the detent.

The latching mechanism of the torque tool preferably has a toothing into which a toothing coupled to the adjusting device engages for locking. With this measure, a locking mechanism is implemented in a simple manner. By having a toothing, e.g. a ring gear, the adjusting device engages in a toothing of the locking mechanism, the adjusting device is locked. Axial displacement of the teeth of the locking mechanism and the adjusting device have the effect that the teeth no longer mesh with one another. The locking mechanism is unlocked and the release torque can be adjusted.

A further advantageous embodiment of the triggering torque tool according to the invention is that the adjusting device comprises a base body and an adjusting button, the adjusting device for unlocking the locking mechanism and for actuating axially from the shaft-like housing to a Stop is provided so that it can be pulled out. This measure is used to create a mechanism which unlocks the locking mechanism with little effort. Pulling out as far as a stop is sufficient to unlock the adjusting device from the detent. After setting, the Adjusting device pushed back and clicks into place. The adjusting knob can now be removed from the main body.

A preferred embodiment of the invention also consists in that the adjusting knob of the releasing torque tool has a threaded pin which engages in a threaded hole in the base body of the adjusting device, the adjusting knob with the threaded pin only being removable when the locking mechanism is locked.

Another advantageous aspect of the torque tool according to the invention is that a plug is provided for closing and / or sealing the threaded hole of the adjusting device. The threaded hole is exposed after removing the adjusting knob. The plug is inserted into the threaded hole for sealing, which can prevent contamination or clogging of the threaded hole. In the case of a seal, it can also be tracked whether the torque tool has been adjusted. In the event of a seal break, incorrect release torques may have been used. This is because the plug cannot be removed without damaging it, which means that an adjustment of the torque can be detected.

An advantageous embodiment of the adjusting device according to the invention for a triggering torque tool also consists in that a latching mechanism is provided for locking a set torque. The locking mechanism ensures that the set target value for the triggering torque locks into place. The target value for the triggering torque can only be adjusted by releasing or overcoming the detent.

A preferred embodiment of the adjusting device according to the invention results from the fact that the locking mechanism has a toothing into which a toothing coupled to the adjusting device engages for locking. As a result, the locking mechanism is implemented with means that are easy to manufacture. Namely by a Toothing, such as a toothed ring, of the adjusting device engages in a toothing of the locking mechanism. The adjusting device engages in this way. A relative displacement of the teeth of the locking mechanism and the adjusting device to one another has the effect that the teeth no longer mesh with one another. The locking mechanism is unlocked and the release torque can be adjusted.

The adjusting knob of the adjusting device according to the invention preferably has a threaded pin which engages in a threaded bore, the adjusting knob with the threaded pin only being removable when the locking mechanism is locked.

Refinements and advantages of the invention are the subject of the subclaims. An exemplary embodiment is explained in more detail below with reference to the accompanying drawings.

Brief description of the drawings

Fig.1

shows a triggering torque tool according to the invention in vertical longitudinal section,

Fig. 2

shows the handle end of the releasing torque tool with display and pulled out control knob.

Fig. 3

shows the handle end of the triggering torque tool with display.

Fig. 4

shows an adjusting device with an adjusting knob for setting a desired torque for a torque tool according to the invention.

Fig. 5

shows an adjusting device with an adjusting knob in section according to FIG Fig. 4 .

Fig. 6

FIG. 11 shows an actuating device with a remote control button according to FIG Figures 4 and 5 on average.

Fig. 7

shows an adjusting device without an adjusting knob.

Description of the embodiment

Figure 1 shows a triggering torque tool 10 according to the invention in vertical longitudinal section. The torque tool 10 shown as a schematic diagram contains a shaft-like housing 12 with a grip area 14 and a head area 16. The head area 16 has an inner square profile 17 into which a drive head (not shown) with an outer square profile is inserted. The drive head directly transmits the torque applied by the torque tool 10 Torque on a workpiece. For this purpose, the drive head can, for example, accommodate various plug-in or plug-on tools.

In the housing 12 a transmission arrangement 18 is provided with which the torque is transmitted to the workpiece. The transmission arrangement 18 is designed as a lever arrangement in the present exemplary embodiment. In this case, levers 20 are pivotably mounted in the housing 12 via bearing bolts 22. The bearing bolts 22 are arranged essentially parallel and provided transversely to the longitudinal axis of the housing 12. A trigger mechanism 24 is used to trigger the torque tool 10. The trigger mechanism 24 contains two interacting trigger levers 26, 28, which are also part of the transmission arrangement 18. Release levers 26, 28 each have a switching edge 30, 32 via which the torque tool 10 is released.

In the grip area 14 of the housing 12 there is an adjusting device 34 with an adjusting knob 36 for setting a desired torque at which the torque tool 10 triggers. The adjusting device 34 acts on a threaded pin 38 with an external thread on which a slide 40 with an internal thread is movably provided. The threaded pin 38 is rotatably mounted in a cylinder-like locking sleeve 42 of the adjusting device 34. The locking sleeve 42 is statically arranged in the grip area 14. In the interior of the locking sleeve 42, a grid, which is not visible here, is provided. In the locked state, the adjusting device 34 cannot be rotated within the locking sleeve 42. The adjusting device 34 is coupled to the threaded pin 38 in a torsionally rigid manner. The adjusting knob 34 can only be rotated after the adjusting device 34 has been unlocked, as a result of which the threaded pin 38 also rotates. The threaded pin 38 is designed as an outer polygon 43 in the area which protrudes into the locking sleeve 42. The adjusting device 34 has a socket 45, which is a polygonal socket (see Fig. 5 or 6) is formed. The adjusting device 34 is pushed with the socket 45 onto the outer polygon 43 of the threaded pin 38. A scale module 44 with which the torque to be set can be displayed on a scale display 46 is provided on the adjusting knob 36.

By turning the threaded pin 38, the slide 40 can be moved axially. An adjusting slide 48 is provided on the slide 40. Depending on the direction of rotation of the adjusting knob 36, as a result of which the adjusting device 34 rotates with the threaded pin 38, the carriage 40 also moves axially forwards or backwards on the threaded pin 38. The adjusting slide 48 acts on a bending rod 50 of the torque tool 10, which transmits the set release torque in the transmission arrangement 18 to the release levers 26, 28.

In Fig. 2 the grip area 14 of the releasing torque tool 10 is shown with the scale display 46 and the adjusting knob 36 pulled out. As far as the Fig. 2 corresponds to the previous figure, the same components are denoted by corresponding reference numerals. The adjusting button 36 and thus the adjusting device 34 can only be pulled out of the locking sleeve 42 up to a stop for unlocking. The torque tool 10 has a scale display 46 for reading the fine adjustment of the setting to be set Release torque. In addition, a scale display 51 for the torque applied in each case is provided in the grip area 14. With the adjusting button 36 pulled out, the adjusting device 34 is unlocked, so that the release torque of the torque tool 10 can be adjusted. To this end, the adjusting device 34 transmits the triggering torque to be set, which can be read from the scale display 46, 51, to the threaded pin 38 according to FIG Fig. 1 . By pressing the adjusting button 34, the adjusting device 34 engages in the grid.

Fig. 3 shows the grip area 14 of the triggering torque tool 14, accordingly Fig. 2 , in which the adjusting knob 36 of the adjusting device 34 engages in the locking sleeve 42 for locking. The same components are therefore denoted by corresponding reference symbols. The locking of the adjusting device 34 initially prevents the set triggering torque from being accidentally adjusted. However, it cannot prevent the user from accidentally or intentionally adjusting it.

Fig. 4 shows the adjusting device 34 with the adjusting knob 36 for setting a desired torque for the torque tool 10. The adjusting device has a cylindrical base body 52, which is provided in the locking sleeve 42. The base body 52 has axial grooves 54. The grooves 54 are located in the inner wall of the circular scale module 44 (see Fig. 1 ) a corresponding counter-element so that the scale module 44 is arranged on the base body 52 in a rotationally fixed manner. A toothing 58 is indicated in the front region 56 of the base body 52. The toothing 58 engages in the grid of the locking sleeve 42, as was described for previous figures. For this purpose, the detent can also be designed as a toothing. The toothing 58 forms a locking mechanism 59 with the locking sleeve 42. The locking sleeve 42 has the corresponding locking mechanism for this purpose. The main body 52 of the adjusting device 34 ends in the adjusting knob 36.

Fig. 5 shows an adjusting device 14 with an adjusting knob 36, in which the base body 52 is shown in a vertical longitudinal section. As far as the Fig. 5 With corresponds to the previous figures, the same components are denoted by corresponding reference numerals. The socket 64 designed as a polygonal socket is provided in the base body 52. The adjusting device 14 is thus pushed axially movably onto the corresponding outer polygon of the threaded pin 38. On the axially opposite side, a threaded bore 66 is provided in the base body 52 of the adjusting device 34. The adjusting knob 36 contains a centrally arranged threaded pin 68 with an external thread. The external thread fits exactly into the threaded bore 66. The adjusting knob 36 can thus be screwed detachably onto the base body 52 of the adjusting device 34.

Fig. 6 FIG. 3 shows the adjusting device 34 with the adjusting knob 36 according to FIG Fig. 5 . This is the only difference between these two views. As far as the Fig. 6 hence with the Fig. 5 corresponds, the same components are denoted by corresponding reference numerals. Fig. 7 shows the base body 52 of the adjusting device 34, but without adjusting button 36. As far as the Figures 6 and 7 correspond to the previous figures, the same reference numerals are used. A plug 70 for closing the adjusting knob 36 is inserted into the threaded bore 66.

The mode of operation of the triggering torque tool 10 can be described as follows: The value at which the torque tool 10 is to trigger is set with the adjusting knob 36. For this purpose, the adjusting knob 36 with the adjusting device 14 is pulled out of the locking sleeve 42 of the torque tool 10 up to the stop. The adjusting device 34 is thereby unlocked. The desired torque value can be set with the adjusting knob 36 by reading it on the scale display 46, 51. The slide 40 is moved via the adjusting device 36 via the threaded pin 38, which acts on the bending rod 50 with the adjusting slide. After setting the triggering torque, the adjusting device is pressed into the locking sleeve. The setting is retained. The adjusting knob 36 can now be separated from the base body 52 of the adjusting device 34. To this end, the adjusting knob 36 is screwed out of the threaded hole 66. The plug 70 can now be inserted into the threaded bore 66 for sealing. The plug 70 prevents one Contamination or clogging of the threaded bore 66. The torque tool 10 now retains the value at which it is intended to trigger. The adjusting device 34 can only be operated again by removing the stopper and screwing the adjusting knob 36 tight. 10 Torque tool 12 shaft-like housing 14th Grip area 16 Head area 17th Inside square profile 18th Transfer arrangement 20th lever 22nd Bearing pin 24 Trigger mechanism 26th Release lever 28 Release lever 30th Switching edge of the release lever 26 32 Switching edge of the release lever 28 34 Adjusting device 36 Control knob 38 Grub screw 40 Sledge 42 Locking sleeve 43 Outer polygon of grub screw 38 44 Scale module 45 Rifle 46 Dial display 48 Control slide 50 Bending rod 51 Dial display 52 Base body 54 Grooves 56 front area of the base body 52 58 Interlocking 59 Locking mechanism 64 Socket with polygonal socket 66 Threaded hole 68 Threaded stud 70 Plug

Claims (8)

1. Releasing torque tool (10) comprising

   a) a shaft-like housing (12) with a grip area (14) and a head section (16),

   b) a transfer assembly (18) In the housing (12) to transfer the torque,

   c) an adjusting device (34) having an adjusting knob (36) to set the torque at which the user desires the tool to provide a signal,

   d) a display (46, 51) to show the value of the torque at which the torque tool (10) should release,

   e) a release mechanism (24), which triggers the release of the torque tool (10) upon reaching the previously set torque,

   f) the adjusting knob (36) of the adjusting device (34) is designed to be removable to block the setting,

   characterized in that

   g) a locking mechanism (59) is provided with which the current setting of the adjusting device (36) is locked.
2. Releasing torque tool (10) according to claim 1, characterized in that the locking mechanism (59) has teeth with which a gear (58) coupled to the setting device (34) engages for the purpose of locking.
3. Releasing torque tool (10) according to one of claims 1 to 2. characterized in that the adjusting device (34) comprises a main body (52) and an adjusting knob (36), whereby the adjusting device (34) can be pulled out of the shaft-like housing (12) axially up to a stop to unlock and activate the locking mechanism (59).
4. Releasing torque tool (10) according to one of claims 1 to 3, characterized in that the adjusting knob (36) has a threaded pin (68), which engages a threaded hole (66) of the main body (52) of the setting device (34), whereby the adjusting knob (36) with the threaded pin (68) can only be removed when the locking mechanism (59) is in the locked state.
5. Releasing torque tool (10) according to claim 4, characterized in that a stopper (70) is provided to plug and/or seal the threaded hole (66) of the adjusting device (34).
6. Adjusting device (34) for a releasing torque tool (10) comprising a main body (52) and an adjusting knob (36) to set a desired torque at which a signal is issued upon reaching the torque, the adjusting knob (36) is removably provided on the main body (52) of the adjusting device (34) to block the setting, characterized in that a locking mechanism (59) is provided to lock a torque setting.
7. Adjusting device (34) for a releasing torque tool (10) according to claim 6, characterized in that the looking mechanism (59) has teeth with which a gear coupled to the setting device (34) engages for the purpose of locking.
8. Adjusting device (34) for a releasing torque tool (10) according to one of claims 6 or 7, characterized in that the adjusting knob (36) has a threaded pin (68), which engages a threaded hole (66), whereby the adjusting knob (36) with the threaded pin (68) can only be removed when the locking mechanism (59) is in the locked state.

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