Screwing tool having a torque limiting device

Abstract

A device having at least two torque transmission bodies (3.1, 3.2, 3.3, 3.4) which can be switched by means of a switching member (11) into different operative positions in a torque transmission path between an input part (1) and an output part (2), characterized in that the torque transmission bodies (3.1, 3.2, 3.3, 3.4) are assigned torque limiting devices (4, 4'; 5, 5'; 24, 24'), by means of which only torques below another limit torque can be transmitted in the different operative positions.

Description

Description Screwing tool with torque limiting device Field of technology

[0001] The invention relates to a device for transmitting a torque from a drive part to an output part, wherein, in a first operating position, a torque applied to the drive part and transmitted to a first torque transmission body is transmitted to the output part by means of a first torque limiting device only if the torque is below a first torque limit, and wherein, in a second operating position, a torque applied to the drive part and transmitted to a second torque transmission body is transmitted to the output part by means of a second torque limiting device only if the torque is below a second torque limit. State of the art

[0002] DE 102018112068 A1 describes a device with which torques below two different limit torques can be transmitted from a drive part to an output part. A compression spring is supported by two torque transmission bodies, which are located in a cavity of the drive part in a rotationally fixed but axially movable manner and each interact with a torque limiting device with a torque transmission body connected in a rotationally fixed manner to the output part. The torque limiting devices differ from one another in that they cannot transmit torques that exceed a different limit torque from the drive part to the output part.

[0003] Devices with similarly acting torque limiting devices are already known from DE 102012102392 A1 or DE 102018112068 A1.

[0004] EP 2155438 B1 describes a pre-calibrated torque screwdriver with several torque transmission bodies arranged axially one behind the other, each of which can be brought into direct torque-transmitting operative connection with the output part, so that different limit torques can be transmitted to a screw connection.

[0005] WO 99 / 04178 A1 discloses a freewheel ratchet mechanism with two axially arranged outer rings of a freewheel mechanism, each of which has rollers. By axial displacement, a shaft can be selectively brought into operative connection with the two freewheel outer rings. The shaft can then be rotated either clockwise or counterclockwise.

[0006] EP 2594367 B1 discloses a screwing tool with a torque limiting device having three toothed rings arranged one above the other, wherein the middle toothed ring has teeth projecting both upwards into an upper toothed ring and downwards into a lower toothed ring.

[0007] DE 10341697 B3 discloses four gear rings acted upon by a single compression spring, two of which mesh with each other. Here, too, two different torques cannot be set, since the two outer gear rings are non-rotatably connected to the handle, and the two inner gear rings are non-rotatably connected to the shaft.

[0008] With the device mentioned above, it is possible to tighten a screw connection with two different torques. However, this requires a screw insert to be inserted into a different polygonal opening. Summary of the invention

[0009] The invention is based on the object of developing, in particular, a device previously known from WO 99 / 04178 A1 in a manner that is advantageous for use. The invention is further based on the object of developing a device with which different limit torques can be transmitted from a drive part to an output part in such a way that more than two different limit torques can be transmitted optionally.

[0010] The problem is solved by the invention specified in the claims, wherein the subclaims are not only advantageous developments of the invention specified in claim 1, but also independent solutions to the problem.

[0011] First and foremost, it is proposed that the torque can be transmitted from the drive part to the output part selectively by various torque limiting devices, with each torque limiting device being assigned an individual limit torque. During torque transmission, one torque transmission body interacts with another torque transmission body, with each torque transmission body forming part of the torque limiting device. The torque transmission bodies can interact with a driver. It can be provided that a first torque transmission body is connected by means of a torque limiting The torque transmission device cooperates with a second torque transmission body. The second torque transmission body can cooperate with the driver. The torque transmission bodies are preferably designed and arranged such that a torque exerted on the first torque transmission body is transmitted to the second torque transmission body via a first torque limiting device. The torque exerted on the second torque transmission body can be transmitted to a driver via a second torque limiting device. A greater limit torque can be transmitted via the second torque limiting device than via the first torque limiting device. The driver can be connected in a rotationally fixed manner to the output part. The torque transmission bodies can then optionally be connected in a rotationally fixed connection to the drive part.However, it is also possible to connect the driver in a rotationally fixed manner to the drive part. The torque transmission bodies can then be selectively brought into a rotationally fixed connection with the output part. According to the invention, a switching element is provided with which, depending on one of the previously mentioned arrangements, one of the torque transmission bodies can be selectively brought into a rotationally fixed relationship with the drive part or output part. The switching element can be a slide that is displaceable in the axial direction. The switching element can be arranged in the cavity in which the torque transmission bodies are also arranged. In a preferred embodiment, at least two torque transmission bodies are arranged one behind the other in the axial direction. The torque transmission bodies are preferably acted upon by a common spring element.In this case, a first torque transmission body, directly acted upon by the spring element, can transmit a first, lowest limit torque to a second torque transmission body. The second torque transmission body is coupled to a further torque transmission body by means of a torque limiting device, wherein this torque limiting device... limiting device has a greater limit torque. The second torque transmission body can be coupled to a torque limiting device with a third torque transmission body, this torque limiting device in turn having a higher limit torque. Thus, a plurality of torque transmission bodies can be arranged axially one behind the other, the last torque transmission body being coupled to a driver with a torque limiting device that has the greatest limit torque. By axially displacing the switching element, one of the torque transmission bodies can optionally be brought into a rotationally fixed connection, for example with the drive part. The limit torque that can be transmitted to the output part by the overall device then corresponds to the smallest limit torque in the chain of torque limiting devices arranged in the torque transmission section.According to a preferred embodiment, the torque limiting devices are formed by torque transmission flanks. The torque transmission flanks can have a flank height measured in the axial direction. The torque transmission flanks can also have an inclination angle measured in the circumferential direction. The flank height and / or the inclination angle, together with the spring preload, define the maximum limit torque that can be transmitted via the adjacent torque transmission flanks. Calibration of the limit torques can thus be achieved via the spring preload.If a torque is applied to such a torque-limiting device, an axial force is generated due to the inclined flanks of the torque transmission flanks. If the spring preload, with which the device can be calibrated, is exceeded, this force leads to an axial displacement of the torque transmission body subjected to the spring force. The limit torque is reached when the torque transmission flanks, preferably formed by teeth, are no longer engaged. the two torque transmission bodies can rotate against each other. The torque transmission device is thus preferably formed by axially intermeshing gears. The plurality of torque transmission bodies arranged axially one behind the other are preferably axially coupled to one another only by mutual tooth engagement. They can axially deflect against the restoring force of the spring element. The torque transmission bodies can be arranged axially one behind the other and form a transmission chain via which, starting with a minimal torque in a first switching position, larger torques can also be transmitted in other switching positions, wherein the number of torque transmission bodies in the transmission chain is reduced as the gear shifts further.In another embodiment of the invention, it can be provided that several torque transmission bodies do not interact directly with one another, but that each torque transmission body interacts directly with the output part and optionally one of the several torque transmission bodies can be rotationally coupled to the drive part. Here, too, a common spring acting in the axial direction can be provided, which acts on the torque transmission bodies, but in such a way that intermeshing torque transmission flanks interact with one another in the axial direction. The torque transmission bodies can have coupling projections extending in the radially outward direction, which engage in coupling recesses of the switching element. The switching element can preferably have the shape of a sleeve with an inner wall that forms the coupling recesses. The coupling recesses can be located between two coupling projections.The torque-transmitting connection between the switching element and the torque-transmitting body can be similar to a splined coupling. The switching element can be displaceable in the axial direction relative to a handle forming the drive part. The handle, which can consist of one or more parts, forms a cavity in which the switching element can be displaced. To transmit the binding of the switching element to the drive part, the switching element can have radially outward-projecting switching cams. A torque can be transmitted to the switching cams. The switching element can also have differently designed projections which, for example, engage with teeth on the inner wall of the cavity. Coupling recesses can be provided into which the switching cam of the switching element can engage in its various switching positions. The recesses can emanate in the circumferential direction from a longitudinal slot arranged in the wall of the handle defining the cavity. The switching cam can protrude slightly beyond the outer surface of the handle so that it can, for example, be moved out of the locking recess against a locking resistance and then be moved axially in the longitudinal slot so that the switching cam can be moved into another locking recess. The locking recesses can be comb-shaped.It can be provided that the device can transmit torques in both the anti-clockwise and clockwise directions. The gearings that form the torque limiting device can therefore have symmetrical teeth. However, the teeth of the gearings of the torque limiting devices can also be designed asymmetrically, so that different, for example greater, torques can be transmitted in the anti-clockwise direction than in the clockwise direction. The handle can consist of several handle parts. A first handle part can form a bearing bore for a bearing section of the output part. A shaft of the output part can extend through the entire handle. A free end of the shaft can be mounted in a bearing bore of a front end of a second handle part, wherein the two handle parts are firmly connected to one another in the axial direction and the direction of rotation by means of connecting elements.The output part can have an axial shaft with a round cross-section. The torque transmission bodies can be rotatably mounted on this shaft. It can be provided that each torque transmission body transmits a torque to a shaft corresponding to the torque. The torque transmission body transmits the torque directly toward the adjacent torque transmission body. However, it may also be the case that output elements are provided between the torque transmission body and are connected to the shaft in a rotationally fixed manner, with which the torque transmission body acts as a torque-limiting device. These transmission bodies can be assigned to the shaft in a rotationally fixed but axially movable manner. Brief description of the drawings

[0012] An embodiment of the invention is explained below with reference to the attached drawings. They show: Fig. 1 a perspective view of an embodiment of the invention, Fig. 2 a view of the embodiment, Fig. 3 a section along the line III-III in Figure 2, Fig. 4 the section along the line IV-IV in Figure 3, Fig. 5 a section similar to Figure 3, wherein a switching element 11 exerts a rotation-inhibiting connection of a torque transmission body 3.1 to a drive part 1, Fig. 6 a view similar to Figure 3, wherein by a relative rotation of the drive part 1 with respect to the output part 2, torque transmission flanks 4, 4' of the torque transmission body 3.1 are switched from a tooth engagement to torque- t transmission flanks 5, 5' of a torque transmission body 3.2 immediately adjacent to the torque transmission body 3.1, Fig. 7 is a representation according to Figure 5, but wherein the switching element 11 is axially displaced with respect to an axis A in such a way that a torque transmission body 3.3 is brought into a rotationally inhibiting connection to the drive part 1, so that torque can be transmitted to the output part 2 via the torque transmission body 3.3, a torque transmission body 3.4 adjacent to it, and a driver 21 adjacent to the latter, Fig. 8 is a representation according to Figure 6, but wherein the torque applied to a torque limiting device consisting of the torque transmission flanks 4, 4', 5, 5' exceeds a limit torque, so that the torque transmission flanks 4, 4', 5, 5' have disengaged, Fig. 9 is a representation according to Figure 5, but the torque transmission body 3.4 forms a torque-transmitting connection to the drive part 1, but the limit torque between torque-transmitting flanks 4, 4' and torque-transmitting flanks 24, 24' of the driver 21 has been exceeded, so that the torque-transmitting flanks 4, 4', 24, 24' have disengaged. Fig. 10 is a view according to Fig. 6, but by axial displacement of the switching element 11, the driver 21 is directly coupled to the drive part 1 in a torque-transmitting manner, Fig. 11 is an exploded view of the device, Fig. 12 is a view of the torque transmission body 3.4, Fig. 13 is a view of the torque transmission body 3.1 and Fig. 14 is a view of the switching element 11. Description of the embodiments

[0013] The device shown in the drawings is a torque screwdriver in the form of an elongated screwdriver with an output part 2 having a polygonal opening 25 into which a magnet 26 is inserted and into which a screw bit 27 can be inserted. The output part 2 is inserted into a drive part 1, which is formed by an elongated handle extending coaxially to the output part 2. The handle consists of two handle parts 30, 38 that are plugged together in the axial direction. When plugged together, the two handle parts enclose a cavity 37 in which a multi-stage torque transmission gear is located.

[0014] The housing part 30 forms a bearing cavity 31 in which a bearing section 29 of the output part 2 is mounted. The bearing section 29 is connected in a rotationally fixed manner to a driver 21, which has a larger diameter than the bearing section 29. One end face of the driver 21 is supported with the interposition of a washer 28 on an end face of the Cavity 37. Adjoining the driver 21 is a circular cylindrical shaft 20, the end of which lies in a bearing recess 42 of another housing part 38.

[0015] The shaft 20 extends through the cavities 7 of a total of four torque transmission bodies 3.1, 3.2, 3.3, 3.4 in the exemplary embodiment. A first torque transmission body 3.1 is directly acted upon by a helical compression spring 17 with the interposition of a washer 19, which is supported on the other end of the cavity 37 with the interposition of another washer 18. During assembly of the two handle parts 30, 38, the spring element 17 is tensioned by applying an axial force. During assembly of the two handle parts, a rear handle part 38 is pushed into the front handle part 30, with strips 39 entering and closing longitudinal slots 34. In the embodiment, three sections of the two housings overlap so that fastening openings 36, 40 are aligned with one another and a connecting pin 21 can form-fit the two handle parts 30, 38 together.

[0016] The preload of the spring element 17 can alternatively also be effected via an abutment element fastened to the end of the shaft 20, which is screwed, for example, as a nut onto an external thread of the shaft 20.

[0017] The slot 34 continues into a longitudinal slot 33 running in the axial direction, from which several recesses 32.1, 32.2, 32.3, 32.4, and 32.5, spaced apart from one another in the axial direction, protrude in the circumferential direction and form locking recesses. In the circumferential direction, locking recesses 32.1 to 32.5 are opposite locking recesses 35.

[0018] Extending into the cavity 37 is a switching element 11 formed by a sleeve, which has a cavity surrounded by an inner wall 14. The switching element 11 has an outer wall 15 extending on a cylindrical surface, with which the switching element 11 displaceably rests against the inner wall of the cavity 37. Cams 16 protrude from the outer wall 15 at a uniform angular distribution. The preferably three cams 16 engage in the longitudinal slots 33 and can be selectively engaged in one of the locking recesses 32.1 to 32.5 by means of an axial displacement and a subsequent displacement in the circumferential direction, for which purpose the locking recesses have locking projections in the region of their mouth. It is therefore necessary to overcome a locking force in order to bring the locking cam 16 into or out of one of the locking recesses.

[0019] Between the driver 21 and the first torque transmission body 3.1 are further torque transmission bodies 3.2, 3.3, and 3.4. The torque transmission bodies are coupled to one another with torque limiting devices such that a torque applied to the first torque transmission body 3.1 via the switching element 11 in the switching position shown in Figures 5 and 6 can be transmitted to the driver 21 when a torque is applied to the handle 30, 38.

[0020] In the switching position shown in Figures 5 and 6, the switching element is coupled in a rotationally fixed manner to the first torque transmission body 3.1. For this purpose, coupling projections 6 projecting radially from the torque transmission body 3.1 engage in coupling recesses 12 arranged between two coupling projections 13 of the switching element 11. If the torque exerted on the first torque transmission body 3.1 exceeds a first limit torque, the torque-transmitting connection connection between the first torque transmission body 3.1 and the second torque transmission body 3.2 is lost, so that the rotationally fixed coupling of these two torque transmission bodies 3.1 and 3.2 is canceled.

[0021] The torque limiting device, with which the two torque transmission bodies 3.1 and 3.2 are coupled together, is formed by a toothing 23. The teeth of the toothing 23 form obliquely running tooth flanks, with the tooth flanks forming torque transmission flanks 4, 4', 5, 5'. The height of the teeth and the angle of inclination of the tooth flanks of the intermeshing teeth of the toothing 23 define a limit torque. When the torque is applied and when the torque is increased, the oblique tooth flanks of the toothing 23 can slide against each other until the position shown in Figure 6 is reached, in which the teeth of the toothing 23 are disengaged. During the associated axial displacement of the torque transmission body 3.1, the coupling projections 6 slide along the coupling projections 13, which have a sufficient axial length.

[0022] Once the position shown in Figure 6 is reached, the torque applied to the output part 2 can no longer be increased. The input part 1 rotates relative to the output part 2. The torque limiting device between the first torque transmission body 3.1 and the second torque transmission body 3.2, which is directly adjacent to the first torque transmission body 3.1, has a limit torque of 2 Nm. A torque limiting device between the second torque transmission body and a third torque transmission body 3.3 has a greater limit torque of 3 Nm. With the torque limiting device between the second torque transmission body 3.2 and the third torque transmission body 3.3 A greater limit torque can thus be transmitted than with the torque limiting device from the first torque transmission body 3.1 to the second torque transmission body 3.2. The third torque transmission body 3.3 borders on a fourth torque transmission body 3.4 with a further torque limiting device. A further higher limit torque of 4 Nm can be transmitted via this torque limiting device. The fourth torque transmission body 3.4 borders on the driver 21 with a further torque limiting device, with which a further greater limit torque of 5 Nm can be transmitted. The torque limiting devices between the spring element 17 and the driver 21 thus have a gradually increasing limit torque.

[0023] When torque is applied clockwise, the switching cam 16 is displaced into the locking recess 32.1. When torque is applied counterclockwise, the switching cam 16 is displaced into the bulge 35 opposite the locking recess 32.1. Instead of the bulge 35, however, another locking recess could also be provided there. Furthermore, the locking recesses can be designed angularly so that the switching cams cannot escape from the locking recesses when the direction of rotation is changed. The switching cams 16 can be designed to lock into the handle in the manner of a bayonet lock.

[0024] If the switching cam 16 is displaced from the locking recess 32.1, it can be brought into a different axial position in the longitudinal slot 33, for example into the position shown in Figures 7 and 8, in which the coupling projections 6 of a third torque transmission body 3.3 lie in the coupling recesses 12, so that the third torque transmission body 3.3 is essentially connected in a rotationally fixed manner to the drive part 2. The rotation The torque limiting devices between the third torque transmission body 3.3 and the first torque transmission body 3.2, as well as the torque limiting device between the second torque transmission body 3.2 and the first torque transmission body 3.1, have no function in this switching position. The torque is transmitted here only via the torque limiting devices between the third torque transmission body 3.3, the fourth torque transmission body 3.4, and the fourth torque transmission body 3.4 and the driver 21.

[0025] By a further axial displacement of the switching element 11, the switching position shown in Figure 9 can be achieved, in which the limit torque is determined only by the torque limiting device between the fourth torque transmission body 3.4 and the driver 21.

[0026] By further axial displacement of the switching element 11, the switching position shown in Figure 10 can be achieved, in which the coupling projections 21 projecting from the driver 21 in the axial direction engage in the coupling recesses 12. In this switching position, the drive part 1 is coupled to the output part 2 without a torque limiting device.

[0027] It is considered advantageous that the device can be brought into various defined switching states with a single, in particular pre-tensioned, helical compression spring 17, in each of which a defined maximum torque can be transmitted.

[0028] It is also considered advantageous that the level of the defined limit torques can be determined solely by the angle of inclination or axial heights of the Torque transmission flanks 4, 4', 5, 5' are adjustable in combination with the preload of the spring element. Figures 12 and 13 show, by way of example, the fourth torque transmission body 3.4 in Figure 12 with drive-side torque transmission flanks 4, 4', which have the greatest axial length. The output-side torque transmission flanks 5, 5' have a somewhat shorter axial length. Figure 13 shows the first torque transmission body 3.4, which has only output-side torque transmission flanks 4, 4', which have the shortest axial length.

[0029] It is intended that the toothings 23 forming the torque transmission flanks 4, 4', 5, 5', 24, 24', which mesh with each other, are of the same design so that a gap-free and backlash-free tooth engagement is achieved.

[0030] The aforementioned technical advantages can also be achieved if, in another exemplary embodiment, one of several torque transmission bodies is selectively brought into an operative position with the switching element 11. In such an exemplary embodiment, each torque transmission body can have a torque limiting device with the output part 2, as is basically known from the prior art. Unlike there, however, all torque limiting devices are to be acted upon by the same spring. For this purpose, it can be provided, for example, that a driver is arranged between each two adjacent torque transmission bodies, which is connected in a rotationally fixed manner to the one on which the torque transmission bodies are rotatably mounted and forms torque transmission flanks acting in the axial direction.For this purpose, it can be provided that these further drivers which are axially connected to the output part 2 and which can interact individually with a torque transmission body, are axially opposite the output. part can be displaced. Thus, the drivers can be disc-shaped bodies arranged between two torque-transmitting bodies, which form torque-transmitting flanks on at least one side.

[0031] In a variant of the invention (not shown), it is proposed that the shaft 20 have an external thread at least at its free end, onto which a nut can be screwed, similar to that described in DE 102004016521 A1, in order to tension the spring element 17. However, other force-locking or form-locking connections can also be provided in order to tie the end of the spring element 17 facing away from the torque transmission bodies 3 to the shaft 20, so that it is supported not in the housing, but on the shaft 20.

[0032] Furthermore, it can be provided that the switching element 11 sits outside an inner housing sleeve, wherein this housing sleeve can be designed similarly to the handle part 30 shown in the drawings. The housing sleeve can have a longitudinal slot 34 through which a coupling projection 13 of the switching element 11 can protrude. Several longitudinal slots 34 offset in the circumferential direction can be provided, through each of which a coupling projection 13 protrudes, which interacts with the coupling projections 6 of the torque transmission body 3.

[0033] It can also be provided that the coupling projections 13 or the switching cams 16 are guided in one or more longitudinal slots 34 in such a way that the switching element 11 does not move in the circumferential direction within the handle 30 when the direction of rotation is reversed.

[0034] In order to lock the switching element 11 in the various axial positions, locking elements can be provided, which can be activated, for example, by actuating a push button can be released in order to displace the switching element 11 in an axial direction.

[0035] In a further embodiment not shown, an outer grip sleeve can also be provided, which can be pushed over the switching element 11 or a handle part supporting the switching element 11, so that the switching element 11 is arranged in a position of use, protected from dust, within the outer sleeve-shaped handle part. Furthermore, an indicator can be provided that shows the currently set torque. For this purpose, a grip sleeve can have a window through which a slide or the switching element 11 is visible. The visible area of ​​the slide or the switching element 11 then bears a code number that indicates the magnitude of the set torque.

[0036] The above statements serve to explain the inventions covered by the application as a whole, which each independently develop the state of the art at least by the following combinations of features, whereby two, several or all of these combinations of features can also be combined, namely:

[0037] A device characterized by a switching element 11 with which the first and second torque transmission bodies 3.1, 3.2, 3.3, 3.4 can be selectively brought into one of the active positions.

[0038] A device characterized in that the at least two torque transmission bodies arranged one behind the other in an axial direction relative to a rotational axis of the device are acted upon by a common spring element 17.

[0039] A device characterized in that the torque limiting devices are formed by torque transmission flanks 4, 4', 5, 5', 24, 24', and the torque transmission flanks 4, 4', 5, 5', 24, 24' of the torque transmission bodies 3.1, 3.2, 3.3, 3.4 stacked directly on top of each other differ from one another in such a way that the limit torques of the torque limiting devices 4, 4', 5, 5', 24, 24' increase stepwise, for which purpose it is provided in particular that the torque transmission flanks of different torque limiting devices 3.1, 3.2, 3.3, 3.4 differ by the angle of inclination of the torque transmission flanks 4, 4', 5, 5', 24, 24' and / or by the axial height of the Torque transmission flanks 4, 4', 5, 5', 24, 24' differ.

[0040] A device characterized in that several torque transmission bodies 3.1, 3.2, 3.3, 3.4 forming the torque transmission flanks 4, 4', 5, 5', 24, 24' are arranged axially one behind the other in a cavity 37 of the drive part 1, coupled only with a mutual tooth engagement, and can axially deflect against the restoring force of a spring element 17, wherein by means of the switching element 11, one of the torque transmission bodies 3.1, 3.2, 3.3, 3.4 can be selectively brought into a rotationally fixed coupling with the drive part 1 and / or that a first torque transmission body 3.1 is directly acted upon by the spring element 17 and the torque transmission flanks 4, 4' of a last torque transmission body 3.4 with Torque transmission flanks 24, 24' of a driver 21 fixedly connected to the output part 2 interact.

[0041] A device which is characterized in that the torque transmission bodies 3.1, 3.2, 3.3, 3.4 have radially outwardly pointing coupling projections 6 which engage in coupling recesses 21 of the switching element 11 which is designed in particular as a sleeve, wherein the switching element 11 within the cavity 37 of the drive part 1 is arranged displaceably and can be fixed in at least two different axial positions.

[0042] A device characterized in that a driver 21 which is connected in a rotationally fixed manner to the output part 2 and which is coupled to a torque transmission body 3.1, 3.2, 3.3, 3.4 via a torque limiting device 4, 4', 24, 24' has coupling projections 22 which engage in the coupling recesses 12 of the switching element 11 in a switching position thereof.

[0043] A device characterized in that in the various switching positions of the switching element 11, torques in both the anti-clockwise direction and the clockwise direction can be transmitted from the drive part 1 to the output part 2, wherein it can be provided that the limit torques that can be transmitted in the anti-clockwise direction and the clockwise direction are different from one another or are the same.

[0044] A device characterized in that the switching element 11 has at least one radially projecting switching cam 16, which can engage in different switching positions of the switching element 11 in locking recesses 32.1, 32.2, 32.3, 32.4, 32.5, which are arranged in particular in a comb-like manner.

[0045] A device which is characterized in that the output part 2 has a driver 21 connected thereto in a rotationally fixed manner and a shaft 20, wherein the driver 21 is supported on an end face of a cavity 37 of a handle 30, 38 formed by the drive part 1, and the shaft 20 extends through a helical compression spring 17 and is mounted in an opposite end face of the cavity 37, wherein between the driver 21 and the spring 17 a plurality of torque transmission bodies 3.1 to 3.4 are rotatably mounted on the shaft 20 and each provided with a torque limiting device 4, 4', 5, 5', 24, 24' are coupled to an adjacent torque transmission body 3.1 to 3.4 or the driver 21.

[0046] All disclosed features are essential to the invention (individually, but also in combination with one another). The disclosure of the application hereby fully incorporates the disclosure content of the associated / attached priority documents (copy of the prior application), also for the purpose of incorporating features of these documents into claims of the present application. The subclaims characterize, even without the features of a referenced claim, independent inventive developments of the prior art with their features, in particular for filing divisional applications based on these claims. The invention specified in each claim may additionally comprise one or more of the features specified in the above description, in particular those provided with reference numbers and / or specified in the list of reference numbers.The invention also relates to designs in which individual features mentioned in the above description are not implemented, in particular insofar as they are clearly unnecessary for the respective intended use or can be replaced by other technically equivalent means. List of reference symbols 1 Drive part 16 Switching cam 2 Output part 17 Spring element 3.1 Torque transmission body 18 Washer 19 Washer 3.2 Torque transmission body 20 Shaft body 21 Driver 3.3 Torque transmission body 22 Coupling projection 23 Toothing 3.4 Torque transmission flank 24 Torque transmission body 4 Torque transmission flank 24' Torque transmission flank 4' Torque transmission flank 25 Insertion opening 26 Magnet 5 Torque transmission flank 27 Screw insert 28 Washer 5' Torque transmission flank 29 Bearing section 30 Handle part 6 Coupling projection 31 Bearing cavity 7 Cavity 32.1 Retaining recess 8 Toothing 32.2 Retaining recess 9 Toothing 32.3 Retaining recess 10 Circumferential surface 32.4 Locking recess 11 Switching element 32.5 Locking recess 12 Coupling recess 33 Longitudinal slot 13 Coupling projection 34 Longitudinal slot 14 Inner wall 35 Recess 15 Outer wall 36 Mounting opening 37 Hollow A Axis 38 Handle 39 Strip 40 Mounting hole 41 Connecting pin 42 Bearing recess

Claims

Claim 1. Device with at least two torque transmission elements (3.1, 3.2, 3.3, 3.4) which can be switched into different operating positions in a torque transmission path between a drive part (1) and an output part (2) by means of a switching element (11), characterized in that torque limiting devices (4, 4'; 5, 5'; 24, 24') are assigned to the torque transmission elements (3.1, 3.2, 3.3, 3.4) with which only torques below a different limit torque can be transmitted in the different operating positions.

2. Device according to claim 1, characterized in that the at least two torque transmission elements (3.1, 3.2, 3.3, 3.4) arranged one behind the other in an axial direction with respect to an axis of rotation of the device are acted upon by a common spring element (17). 3.Device according to claim 2, characterized in that the torque limiting devices are formed by torque transmission flanks (4, 4', 5, 5', 24, 24') and the torque transmission flanks (4, 4', 5, 5', 24, 24') of the directly stacked torque transmission bodies (3.1, 3.2, 3.3, 3.4) differ from each other in such a way that, starting from a torque transmission body (3.1) axially furthest from the output part (2), the limiting torques of the torque limiting devices (4, 4'; 5, 5'; 24, 24') increase stepwise in the direction of the output part (2).

4. Device according to claim 3, characterized in that the torque transmission flanks of various torque limiting devices (3.1, 3.2, 3.3, 3.4) are determined by the inclination angle of the. distinguish torque transmission flanks (4, 4', 5, 5', 24, 24') and / or by the axial height of the torque transmission flanks (4, 4', 5, 5', 24, 24').

5. Device according to claim 3 or 4, characterized in that several torque transmission elements (3.1, 3.2, 3.3, 3.4) forming the torque transmission flanks (4, 4', 5, 5', 24, 24') are coupled to one another only by mutual engagement of the torque transmission flanks and are arranged axially one behind the other in a cavity (37) of the drive part (1) and can deflect axially against the restoring force of a spring element (17), wherein by means of the switching element (11) one of the torque transmission elements (3.1, 3.2, 3.3, 3.4) can be selectively brought into a rotationally fixed coupling with the drive part (1).

6. Device according to one of the preceding claims, characterized in that a first torque transmission element (3.1) is acted upon directly by the spring element (17) and the torque transmission flanks (4, 4') of a last torque transmission body (3.4) interact with torque transmission flanks (24, 24') of a driver (21) fixedly connected to the output part (2).

7. Device according to one of the preceding claims, characterized in that the torque transmission bodies (3.1, 3.2, 3.3, 3.4) have radially outwardly projecting coupling projections (6) which engage in coupling recesses (21) of the switching element (11), which is designed in particular as a sleeve, wherein the switching element (11) is slidably arranged within the cavity (37) of the drive part (1) and can be fixed in at least two different axial positions.

8. Device according to one of the preceding claims, characterized in that a driver (21) non-rotatably connected to the output part (2), which is coupled to a torque transmission body (3.1, 3.2, 3.3, 3.4) via a torque limiting device (4, 4', 24, 24'), has coupling projections (22) which engage in the coupling recesses (12) of the switching element (11) in a switching position.

9. Device according to one of the preceding claims, characterized in that, in the various switching positions of the switching element (11), torques in both the counterclockwise and clockwise directions can be transmitted from the drive part (1) to the output part (2).

10. Device according to claim 9, characterized in that the limit torques that can be transmitted in the counterclockwise and clockwise directions are different from each other or are the same. 11.Device according to one of the preceding claims, characterized in that the switching element (11) has at least one radially projecting switching cam (16) which can engage in comb-like detent recesses (32.1, 32.2, 32.3, 32.4, 32.5) in various switching positions of the switching element (11).

12. Device according to one of the preceding claims, characterized in that the output part (2) has a driver (21) and a shaft (20) non-rotatably connected thereto, wherein the driver (21) is supported on an end face of a cavity (37) of a handle (30, 38) formed by the drive part (1), and the shaft (20) extends through a helical compression spring (17) and into an opposite The front face of the cavity (37) is supported, wherein a plurality of torque transmission bodies (3.1 to 3.4) are rotatably mounted on the shaft (20) between the driver (21) and the spring (17), and each is coupled to an adjacent torque transmission body (3.1 to 3.4) or to the driver (21) via a torque limiting device (4, 4', 5, 5', 24, 24'). 13.Device according to one of the preceding claims, characterized in that, in a first operating position, a torque applied to the drive part (1) is only transmitted to the output part (2) if the torque is below a first limit torque, and in a second operating position, a torque applied to the drive part (1) is only transmitted to the output part (2) if the torque is below a second limit torque, which is greater than the first limit torque, wherein, in the first operating position, the torque is transmitted via a first torque transmission element (3.3) and a second torque transmission element (3.4), and in the second operating position, the torque is transmitted only via the second torque transmission element (3.4). 14.Device according to one of the preceding claims, characterized in that, in the different operating positions, only one torque transmission element (3.1, 3.2, 3.3, 3.4) is rotationally fixed to the drive part (1).

15. Device or method characterized by one or more of the characterizing features of one of the preceding claims.

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