TORQUE SCREWDRIVER

Description

[0001] The invention relates to a torque screwdriver according to the features in the preamble of claim 1.

[0002] Torque tools, such as torque screwdrivers, are hand-operated tools used to apply a controlled torque to a workpiece, typically a screw or nut. Adjustable torque tools allow for the application of a defined tightening torque to ensure the necessary clamping force or assembly preload between the components being joined.

[0003] Torque screwdrivers have a release mechanism housed in the handle. The handle also incorporates an adjustment device with a torque indicator. The desired torque is set by compressing a spring, which is achieved by rotating the adjusting element, connected to an adjustment mechanism (usually a threaded spindle), relative to a fixed part of the handle.

[0004] An adjustable torque screwdriver is known through US 9,421,675 B2.

[0005] DE 298 00 921 U1 as well as EP 0 661 139 B1 disclose ratchet screwdrivers.

[0006] Furthermore, according to DE 10 2005 034 114 B9, a switchable torque screwdriver is considered state of the art.

[0007] The aforementioned torque screwdrivers operate with a reversible ratchet mechanism to transmit torque in one direction, while in the opposite direction, no force is transmitted; the ratchet spins freely. Such mechanical ratchet mechanisms inherently possess a return resistance, which becomes noticeable when reversing. The magnitude of this return resistance varies depending on the design of the ratchet mechanism. A completely resistance-free return is not possible with known mechanisms. This return resistance is particularly detrimental when tightening or pre-tightening loose screw connections, as the tightening torque of the screws is often lower than the return resistance. Consequently, the ratchet mechanism is ineffective in such applications. Similar problems arise with screw connections requiring very low tightening torques, as the tightening torque can be lower than the return resistance.

[0008] The reversible screwdriver disclosed in DE 25 03 372 A1 provides for torque transmission by means of rollers. The direction of rotation is changed via a control device. The rollers interact with the shaft and an internal bore in the screwdriver handle, so that when torque is transmitted, the rollers wedge themselves in a direction of rotation selectable by the control device, and torque can be transmitted in that direction. The direction of rotation is reversed by switching the control device.

[0009] A design for adjusting the torque on a torque screwdriver is part of the prior art according to DE 10 2013 009 358 A1, which discloses the preamble of claim 1. An adjusting device for setting a torque and a torque mechanism are arranged in the handle, the torque mechanism comprising a drive shaft for transmitting a torque and a release mechanism for interrupting torque transmission when a set torque is reached.

[0010] A screwdriving tool with a direction-switchable freewheel lock is described in DE 197 07 798 A1.

[0011] Furthermore, an adjustable torque screwdriver is also described in US 2015 / 0090078 A1.

[0012] Starting from the prior art, the invention is based on the objective of improving a torque screwdriver in terms of application technology and functionality.

[0013] According to the invention, the solution to this problem consists of a torque screwdriver according to claim 1.

[0014] Advantageous embodiments and further developments of the torque screwdriver according to the invention are the subject of the dependent claims.

[0015] Embodiments and modifications of features of the torque screwdriver, which individually or in combination make the invention technically advantageous, also result from the description and the accompanying drawings.

[0016] The torque screwdriver features a handle, a torque setting indicator, and an output shaft. The handle houses an adjustment device for setting the torque and a torque mechanism. This mechanism includes a drive shaft for transmitting torque and a release mechanism to interrupt torque transmission when the set torque is reached.

[0017] The release mechanism of the torque screwdriver incorporates a clutch that interrupts torque transmission when a preset torque is reached. The clutch comprises a first clutch element and a second mating clutch element, which are positively coupled via a toothed connection. The first clutch element interacts with the second mating clutch element and is biased by the compression spring. The teeth are angled and have a helical tooth profile. As soon as a counter-torque is applied to the output and transmitted to the input side, the two clutch elements move apart along the contact surfaces on the teeth. This movement occurs against the spring force of the compression spring, with the torque applied at the handle and the counter-torque being of identical magnitude.Once a set torque (release torque) is reached, the first coupling component and the second mating coupling component have moved apart sufficiently to break the positive engagement between them. This prevents the application of a higher torque at the output, and the gearing engages in the next position. If the torque applied at the handle is not reduced, this process repeats. The process is only interrupted when the torque at the handle is less than the release torque.

[0018] By increasing or decreasing the spring force of the compression spring, the desired release torque of the release mechanism on the clutch can be proportionally changed. This adjustment is made by rotating the adjusting screw.

[0019] The drive shaft and the output shaft are coupled via a freewheel mechanism. This freewheel mechanism is designed to transmit or support torque in one direction of rotation, while allowing rotational movement (idle) in the opposite direction. The inventive design of a torque screwdriver with this freewheel mechanism eliminates, or almost completely eliminates, the resistance to return when the handle is turned back. The freewheel mechanism enables resistance-free return when re-engaging the handle. When actuated in the tightening direction, the freewheel mechanism locks itself and transmits the torque. The inventive operating principle allows for the tightening of unloaded screws or nuts. Even screw connections requiring very low tightening torques can be advantageously produced with the inventive torque screwdriver.

[0020] According to the invention, the freewheel mechanism comprises an inner shaft, an outer ring, a shift cage, and at least one clamping element. In particular, the clamping element is a clamping roller. The shift cage is arranged on a shaft section of the inner shaft. The clamping element is arranged in a recess in a cylindrical section of the shift cage. The outer ring is connected, at least indirectly, to the drive shaft. Advantageously, the outer ring is formed integrally with the output end of the drive shaft. Preferably, the outer ring is part of a cylindrical sleeve with a base at the output end of the drive shaft. A circumferential annular flange is provided on the outer circumference of the outer ring. This flange interacts with a stop in a receiving section of the handle and secures the axial position of the drive shaft in the handle.

[0021] The clamping element is positioned between the inner shaft and the outer ring. In a clamping position, the clamping element transmits a torque between the outer ring and the inner shaft. The clamping element is supported against a flat surface of the shaft section and against an inner circumferential surface of the outer ring. During rotation in the idling direction, the clamping element slides on the running surfaces of the inner shaft and outer ring.

[0022] When the handle rotates in the tightening direction, frictional engagement is achieved through static friction at the contact surfaces between the flat surface of the shaft section and the inner circumferential surface of the outer ring. The torque is transmitted via the clamping element(s). A drive movement with repeated changes of direction is gradually transferred to the output side, or the output in the clamping direction, in the same direction of rotation. When the direction of rotation changes from the clamping direction to the free-running direction, a return to the original position occurs without torque transmission.

[0023] The freewheel mechanism is switchable. The torque screwdriver has a neutral position in which torque can be transmitted in both directions of rotation. In the neutral position, the torque screwdriver according to the invention functions like a conventional screwdriver. By switching the freewheel mechanism, it can be changed between a first clamping position and a second clamping position, thus setting the tightening direction. To switch the freewheel mechanism, the switching cage is rotatable relative to the inner shaft and / or the outer ring. This allows the clamping element to be moved from the neutral position, in which torque can be transmitted in both directions of rotation, to the first clamping direction or the second clamping position. In the first clamping position, torque is transmitted in one direction of rotation (tightening direction). In the second clamping position, torque is transmitted in a second direction of rotation (loosening direction).In the opposite direction (freewheel direction) to the first or second direction of rotation, no torque is transmitted. The torque mechanism can be reversed in the freewheel direction without idling.

[0024] To prevent the switching cage from automatically changing its switching position or the respective clamping position, locking devices are provided which are designed and intended to secure the switching cage in the neutral position, the first clamping position or the second clamping position.

[0025] In particular, a detent device has a detent element arranged in a radial bore of the inner shaft. The detent element interacts with a spring inserted in the radial bore, which acts against the detent element, causing it to be spring-loaded outwards from the radial bore. The shift cage has detents into which the detent element engages in the respective clamping or neutral position. The contour of the detent is matched to the outer geometry of the detent element. In particular, the detent element is a sphere.

[0026] The freewheel mechanism is switched via a switching element designed to change the position of the shift cage. This change is achieved by rotating the switching element around the longitudinal axis of the torque screwdriver. Specifically, the switching element is a switching ring or a switching disc. It can be manually actuated. Rotating the switching element moves the shift cage into a clamping position or the neutral position.

[0027] The invention provides that a collar is provided on the drive shaft-side end section of the inner shaft, which is supported on a base of the outer ring.

[0028] Furthermore, according to the invention, a pin is provided on the drive-shaft end section of the inner shaft, which projects into a central bore in the base of the outer ring. To prevent a change in the switching state due to frictional torques during use of the freewheel, the collar of the inner shaft is supported against the base of the outer ring. This prevents frictional torque between the shift cage and the outer ring and thus prevents switching. The pin projecting into the bore in the base of the outer ring centers the assembly and prevents misalignment.

[0029] The freewheel mechanism is axially secured by a cover. The cover is located on the output side of the shift cage and is fixed to or within the handle. The shift cage has a flanged body that rests against the cover.

[0030] The cover is inserted into a recess at the output end of the handle, ensuring it is aligned correctly. It is then secured by a twisting motion relative to the handle. The cover features a spigot section. This spigot section is equipped with joining elements, specifically cutting teeth or cutting edges. As the cover is twisted for installation, these joining elements bite into the material of the handle. For installation or to facilitate the process, the cover may be provided with engagement surfaces, such as a slot, into which a tool can engage. To prevent over-tightening, the handle and cover have interacting stop surfaces. Furthermore, locking elements are provided on both the handle and the cover to prevent the connection between the handle and cover from loosening unintentionally. When the cover is twisted in, it is secured by friction and positive locking within the front cylindrical section of the handle.Preferably the handle is made of plastic, whereas the lid is made of a metallic material.

[0031] Another advantageous embodiment provides that the inner shaft has an output section which can be coupled to the output or on which the output is formed. The output section can be designed as an external polygon with a holding system for tools, for example, sockets or bit holders. Alternatively, the output section can be designed as an internal polygon.

[0032] The output shaft preferably includes a tool holding system.

[0033] A particularly advantageous embodiment for practical use provides that the output section has an internal polygonal receptacle and, in the area of ​​the internal polygonal receptacle, a slot oriented transversely to the longitudinal extent of the output section. The tool holding system has a pull sleeve that is arranged on the output section with limited displacement. The pull sleeve is arranged concentrically to the output section and has a front collar and a rear plug body. The detent spring has a helical section and a straight leg. The helical section of the detent spring engages the outside of the output section. The helical section is supported by a ring element. The leg is designed and configured to provide a counter-holding action against a tool, in particular a bit, inserted into the internal polygonal receptacle. The leg of the detent spring engages through the slot into the internal polygonal receptacle.This allows the straight leg of the detent spring to engage in a standardized detent groove of a tool, particularly a bit, and secure a bit inserted into the internal polygonal socket. A compression spring is arranged on the side of the ring element opposite the detent spring. The compression spring is designed to prevent any play when a tool, particularly a bit, is inserted into the internal polygonal socket. The compression spring's function is to continuously and slightly push the pull sleeve backward.

[0034] The compression spring acts against the end plug of the pull sleeve. The pull sleeve and the plug are pressed together to form a solid unit.

[0035] To remove a tool from the internal multi-sided socket, the tool holding system is unlocked. This is done by pulling back the pull sleeve. The detent spring is released by pulling back the pull sleeve; an inner edge of the front collar of the pull sleeve displaces the detent spring as it is pulled back, so that the straight leg is moved out of the holding position and releases the inserted tool.

[0036] The slot in the output section is directed obliquely backwards from the inside of the internal polygonal mount and extends to the outside of the output section.

[0037] A further embodiment of the torque screwdriver according to the invention, which improves its application and functionality overall, provides that the adjusting device comprises a pre-tensionable compression spring, an adjusting nut, and an adjusting screw. To set a torque, the adjusting device interacts with an adjusting element that can be rotated about the longitudinal axis of the handle.

[0038] The selected torque is displayed numerically. For this purpose, the torque screwdriver according to the invention has a digital counter arranged in a hollow cylindrical section of the handle.

[0039] Furthermore, an advantageous embodiment of the torque screwdriver according to the invention consists in the integration of an adjustment arrangement via which an adjustment of the torque setting can be carried out.

[0040] The invention is described in more detail below with reference to the drawings. These show: Figure 1 shows a side view of a torque screwdriver according to the invention; Figure 2 shows a longitudinal section through the torque screwdriver; Figure 3 shows a section through the representation of the Figure 2 along line AA; Figure 4 shows a section through the representation of the Figure 2 along line BB; Figure 5 shows a section through the representation of the Figure 2 along line CC; Figure 6 shows a section through the representation of the Figure 2 along line DD; Figure 7 shows a section through the representation of the Figure 2 along line EE; Figure 8 Components of the torque screwdriver in a perspective exploded view; Figure 9 the representation according to the Figure 8 in a side view; Figure 10 a sectional view through the representation of the Figure 9 along the line FFin a perspective view; Figure 11 Components of the torque screwdriver in a perspective exploded view without showing the handle; Figure 12 the representation of Figure 11 in a side view; Figure 13 a section through the representation of the components according to the Figure 12 along line GG; Figure 14 Components of the freewheel mechanism and the output in a side view; Figure 15 a section through the representation according to the Figure 14along line HH; Figure 16 a shift cage in a side view; Figure 17 the shift cage in a perspective view obliquely from the front; Figure 18 the shift cage in a rear view; Figure 19 components of the freewheel mechanism and the output in a perspective exploded view; Figure 20 an end view of the open side of the output-side end of the handle; Figure 21 the end view of the output-side end of the handle with the freewheel mechanism inserted and the cover positioned; Figure 22 a view corresponding to the representation of Figure 21 with a cap screwed into the end by a twist; Figure 23 another embodiment of a torque screwdriver in a perspective exploded view; Figure 24 the torque screwdriver according to the Figure 23 in a side view and Figure 25 a section through the Figure 24 along line II in perspective.

[0041] Based on the Figures 1 to 22 A torque screwdriver 1 according to the invention and its components are described. Figures 23 to 25 show a variant of the torque screwdriver 1.

[0042] The torque screwdriver 1 has a handle 2, a display 3 for a set torque, and an output shaft 4. Integrated into the handle 2 is an adjusting device 5 for setting a specific torque or a defined release torque. The adjusting device 5 comprises an adjusting mechanism with a pre-tensioned compression spring 6, which is supported by an adjusting nut 7 fixed in the handle 2, and an adjusting screw 8. The desired torque is set by compressing or releasing the compression spring 6.

[0043] The adjusting device 5 and its adjusting mechanism interact with an adjusting element 9 on the handle 2. The adjusting element 9 is rotatable relative to the handle 2 about its longitudinal axis LA. The torque is adjusted by rotating the adjusting element 9 relative to the fixed part of the handle 2. To secure the set torque against unintentional adjustment, the adjusting element 9 is locked by a locking mechanism 10, which is actuated by a locking button 11.

[0044] The output shaft 4 of the torque screwdriver 1 is located on the end face of the handle 2. The output shaft 4 is designed to accommodate interchangeable tools. For the interchangeable insertion of different bits, the output shaft 4 is equipped with a tool holding system 12 specifically designed for this purpose.

[0045] The torque indicator 3 has a digit counter 14 arranged in a hollow cylindrical section 13 of the handle 2, with several digit rollers 15 arranged one behind the other, which can be read through a viewing window 16 in the handle 2.

[0046] The torque transmission from the handle 2 to the output 4 is effected via a torque mechanism 17. The output 4 is coupled to a drive shaft 18 for torque transmission. The drive shaft 18 is mounted in the handle 2 and has an output-side cylindrical sleeve 19 with an annular collar 20, as well as a central shaft section 21 and an end section 22.

[0047] A release mechanism 23 with a clutch 24 is arranged in the handle 2. The clutch 24 interrupts the torque transmission when a specific release torque is reached. The clutch 24 comprises a first clutch component 25 and a second counter-clutch component 26. When a torque is applied via the handle 2, it is transmitted to the clutch component 25. The clutch component 25 interacts with the counter-clutch component 26 and is biased by the compression spring 6. The first clutch component 25 and the second counter-clutch component 26 are positively coupled via a toothed connection 27. The teeth of the first clutch component 25 and the teeth of the second counter-clutch component 26 are inclined and have a helical tooth profile. The helical shape and the resulting helix ensure low surface pressure between the first clutch component 25 and the second counter-clutch component 26.

[0048] The second counter-coupling component 26 is radially coupled to the drive shaft 18 via a hexagonal connection and is supported on the base 28 of the cylinder sleeve 19. As soon as a counter-torque is applied to the output 4 and transmitted to the drive shaft 18, the first coupling component 25 and the second counter-coupling component 26 move apart along the contact surfaces on the teeth. This movement occurs against the spring force of the compression spring 6, with the torque applied at the handle 2 and the counter-torque being identical in magnitude. Once a set torque, i.e., the release torque, is reached, the first coupling component 25 and the second counter-coupling component 26 have moved apart sufficiently to disengage the positive locking between the two components. This prevents the application of a higher torque at the output 4, and the toothing 27 engages in the next position.If the torque applied to handle 2 is not reduced, this process repeats itself. Only when the torque at handle 2 is less than the release torque is the process interrupted.

[0049] By increasing or decreasing the spring force of the compression spring 6, the desired release torque of the release mechanism 23 at the clutch 24 can be proportionally changed. This adjustment is achieved by a rotary movement of the adjusting screw 8, which is supported by an axial bearing 29. The axial bearing 29 serves to reduce the required adjusting torque at the adjusting screw 8. When the adjusting screw 8 is turned, the connected adjusting nut 7 moves axially, thereby changing the preload of the compression spring 6, which is supported by the adjusting nut 7. The direction of thread rotation determines the effect produced by each direction of rotation. To prevent the adjusting nut 7 from rotating when the adjusting screw 8 is turned, it is radially fixed in the handle 2. The adjusting nut 7 is axially displaceable along the longitudinal axis LA.

[0050] The torque screwdriver 1 has an adjustment assembly 30 with an adjustment coupling 31 and an adjustment shaft 32. The release torque can be adjusted via the adjustment assembly 30. The torque is transmitted via the adjustment coupling 31 and the adjustment shaft 32 to adjust the adjusting screw 8 and thus set the release torque. In this way, the setting value displayed on the indicator 3 via the digital counter 14 and the release torque are aligned.

[0051] The drive shaft 18 and the output shaft 4 are coupled via a freewheel mechanism 33. The freewheel mechanism 33 has an inner shaft 34, an outer ring 35, and a shift cage 36. The outer ring 35 is part of the cylinder sleeve 19 at the output-side end 37 of the drive shaft 18. The cylinder sleeve 19, with its outer ring 35, base 28, and ring collar 20, is a single, integral component of the drive shaft 18, made of the same material.

[0052] Furthermore, the freewheel mechanism 33 comprises clamping elements 38 in the form of clamping rollers. In the illustrated embodiment of the torque screwdriver 1, two clamping elements 38 are provided.

[0053] The shift cage 36 is arranged on a shaft section 39 of the inner shaft 34. The clamping elements 38 are arranged in recesses 40 in a cylindrical section 41 of the shift cage 36. The clamping elements 38 each bear against a planar surface 42 of the shaft section 39. The two planar surfaces 42, each interacting with a clamping element 38, are diametrically opposed to each other on the cylindrical section 41. On the outer ring 35, the clamping elements 38 bear against an inner circumferential surface 43 of the outer ring 35.

[0054] In a clamping position, the clamping elements 38 transmit a torque between the outer ring 35 and the inner shaft 34. No torque is transmitted in the opposite direction. The handle 2 is free-running in the opposite direction. A drive rotational movement of the handle 2 with repeated changes of direction is gradually transmitted to the output 4 in the same direction, in each case in the clamping direction.

[0055] In a clamping position R for clockwise rotation or a clamping position L for counterclockwise rotation, the clamping elements 38 rest against a right or left contact edge 44 in a recess 40 of the switching cage 36, respectively. The right or left contact edge 44 ensures that a self-locking state occurs, allowing torque transmission only in one direction of rotation, while in the opposite direction, there is no rotation. The contact edge 44 reduces the clearance of a clamping element 38, preventing it from becoming wedged between the inner shaft 34 and the outer ring 35. In this direction of rotation, the mechanism can be turned back without resistance, allowing for easy re-engagement. In the opposite direction, the mechanism locks itself.

[0056] In the present embodiment of the torque screwdriver 1, two clamping elements 38 are provided. Each clamping element 38 requires a flat surface 42. The two flat surfaces 42 are located opposite each other on the shaft section 39 at the same distance from the longitudinal axis LA.

[0057] The installed shift cage 36 serves to control the self-locking mechanism.

[0058] The switching cage 36 can be set to three switching positions to set three operating positions of the freewheel mechanism 33. The switching positions define a neutral position N, the first clamping position R for clockwise operation, and the second clamping position L for counterclockwise operation.

[0059] In the neutral position N, the shift cage 36 provides the clamping elements 38 with sufficient freedom of movement that the mechanism self-locks in both clockwise and counterclockwise directions, thereby disabling the freewheel. The torque screwdriver 1 transmits torque in both clockwise and counterclockwise directions. In the other two clamping positions R and L, the right or left contact edge 44 in the recesses 40 of the shift cage 36 ensures that self-locking only functions in one direction of rotation. The contact edge 44 reduces the clearance of the clamping elements 38, preventing them from jamming between the inner shaft 34 and the outer ring 35. In this direction of rotation, the freewheel mechanism 33 can be turned back without resistance, allowing for easy re-engagement. In the opposite direction, the freewheel mechanism 33 self-locks. The second clamping position L merely changes the direction of actuation.the freewheel direction of the freewheel mechanism 33. This allows the torque screwdriver 1 to be set between clockwise tightening, counterclockwise tightening and locking function in the neutral position N, depending on the requirements.

[0060] The freewheel mechanism 33 is switchable, with the shift cage 36 being rotatable relative to the inner shaft 34 and the outer ring 35. This moves the clamping elements 38 from the neutral position N, in which torque can be transmitted in both directions of rotation (clockwise or counterclockwise), to the first clamping position R or the second clamping position L. In the first clamping position R, torque is transmitted in the first clockwise direction of rotation (tightening direction). In the second clamping position L, torque is transmitted in the second counterclockwise direction of rotation (release direction). No torque is transmitted in the respective opposite direction (freewheeling direction) of the first and second directions of rotation.

[0061] To prevent the shift cage 36 from changing its position automatically, detent devices 45 are provided, which are designed and intended to secure the shift cage 36 in the neutral position N, the first clamping position R, or the second clamping position L. A detent device 45 has a radially arranged bore 46 in the inner shaft 34, in which a spring-loaded detent element 48 in the form of a ball is located. Detents 49 are provided on the shift cage 36. The detent element 48 and the detents 49 interact. In the respective switching position, the detent element 48 can engage in a detent 49 on the shift cage 36 and prevent automatic switching. The detents 49 are configurably adapted to the outer contour of a detent element 48. In particular, the detents 49 are designed as spherical segment-shaped recesses in the shift cage 36.The bore 46, the mounting edges 44, and the detents 49 must be oriented relative to the planar surfaces 42 of the inner shaft 34. The switching cage 36 is axially secured by means of a retaining ring 50, which is arranged in a circumferential groove 51 of the inner shaft 34.

[0062] To prevent a change in the switching state due to frictional torques when using the torque screwdriver 1, a collar 52 of the inner shaft 34 bears against the base 28 of the cylinder sleeve 19. This prevents a corresponding frictional torque between the shift cage 36 and the outer ring 35, thus preventing switching. The collar 52 is located on the drive-shaft end section of the inner shaft 34. At the end of the collar 52, there is also a pin 53 that engages in a bore 54 in the base 28. The purpose of this pin 53 is to prevent or limit any misalignment between the outer ring 35 and the inner shaft 34.

[0063] The axial securing of the freewheel mechanism 33 is achieved by a cover 55. The cover 55 itself is attached to the handle 2. The cover 55 is located on the output side of the shift cage 36 and is fixed to the handle 2. The shift cage 36 has a flange 56 against which the cover 55 rests. The cover 55 has a spigot section 57. Joining elements 58 in the form of cutting teeth are provided on the spigot section 57. These are designed for frictional and form-fitting attachment of the cover 55 in a front cylindrical section 59 of the handle 2. The cover 55 is inserted, aligned, into a recess 60 provided in the front cylindrical section 59. By a subsequent rotational movement relative to the handle 2, the joining elements 58, located on the outer circumference of the spigot section 57, screw into the material of the handle 2.The lid 55 has a slot 61 into which a suitable tool can engage. To prevent over-tightening, stop surfaces 62 are provided on the handle 2 and the lid 55. Additionally, locking elements 63 are provided on the handle 2 and the lid 55 to prevent the connection from loosening unintentionally.

[0064] The handle 2 is made of plastic, whereas the lid 55 is made of a metallic material.

[0065] A groove 64 is provided on the inner diameter of the cover 55. This groove allows the cover to pass over the drive lugs 65 of the switching cage 36. The drive lugs 65 are required to establish a radial connection to a switching element 66. The switching element 66 is specifically designed as a switching disc. The switching element 66 enables the switching cage 36 to be switched, fulfilling two functions. Firstly, the cover 55 is covered by the switching element 66, and secondly, the switching element 66 provides improved switching comfort, as it has a larger circumference and can also be provided with an external profile. The switching element 66 is axially secured by locking lugs 67, which engage in corresponding recesses 68 in the switching cage 36.

[0066] The inner shaft 34 has an output section 69 which can be coupled to the output 4 or on which the output 4 is formed.

[0067] Based on the Figures 1 to 22 The torque screwdriver 1 described above has a tool holding system 12 on the output 4.

[0068] The output section 69 has an internal polygonal receptacle 70. This is designed to receive a polygonal section 71 of a tool 72, in particular a screwdriver bit. In the area of ​​the internal polygonal receptacle 70, the output section 69 has a slot 73 oriented transversely to the longitudinal extent of the output section 69. The slot 73 extends obliquely backwards from the inner side 74 of the internal polygonal receptacle 70 to an outer side 75 of the output section 69.

[0069] The tool holding system 12 further comprises a draw sleeve 76, which is arranged on the output section 69 with limited displacement, and a detent spring 77. The draw sleeve 76 has a front collar 78 and, with an opening 79, circumferentially encloses the front end of the output section 69. A rear plug body 80 is pressed onto the draw sleeve 76 and firmly connected. On the drive shaft side, the plug body 80 has a radial recess 81. This recess allows it to radially engage a central section 82 of the inner shaft 34 and, when the draw sleeve 76 is retracted, to be guided over the central section 82 within certain limits.

[0070] The detent spring 77 has a helical section 83 and a straight leg 84. The detent spring 77 is guided by the helical section 83 on the output section 69 and surrounds it externally. A ring element 86 in the form of a retaining ring is arranged in a groove 85 in the output section 69. The helical section 83 is supported against the ring element 86. The straight leg 84 extends through the slot 73 into the internal polygonal recess 70. The leg 84 is designed and configured to hold a tool 72 inserted into the internal polygonal recess 70. For this purpose, the leg 84 of the detent spring 77 engages in the standardized detent groove 87 of a tool 72.

[0071] A compression spring 88 is arranged on the side of the ring element 86 opposite the detent spring 77. The compression spring 88 is designed to prevent play when a tool 72 is inserted into the internal polygonal recess 70 and creates a gap between a front inner edge 89 of the draw sleeve 76 and the detent spring 77. The compression spring 88 serves to continuously and slightly push the draw sleeve 76 backward over the plug body 80. The applied spring force is so small that it does not affect the detent spring 77.

[0072] By retracting the pull sleeve 76, the detent spring 77 is unlocked. An inner edge 89 of the pull sleeve 76 pulls the detent spring 77 back along the slot 73, releasing a tool 72.

[0073] The one in the Figures 23 to 25The illustrated torque screwdriver 1 has an output 4 with an output section 69, on which an external polygon 90 is formed. A detent arrangement 91 is integrated into the output section 69 with the external polygon 90. The output 4 with the external polygon 90 and the detent arrangement 91 is designed and configured to hold and drive commercially available tools, such as sockets.

[0074] Otherwise, the embodiment of the torque screwdriver 1 with its adjusting device 5 for setting a torque as well as the torque mechanism 17 and the freewheel mechanism 33 corresponds to the embodiment described above. Reference symbol:

[0075] 1 -Torque screwdriver 2 -Handle 3 -Display 4 -Output 5 -Adjusting device 6 -Compression spring 7 -Adjusting nut 8 -Adjusting screw 9 -Actuating element 10 -Locking mechanism 11 -Locking button 12 -Tool holding system 13 -Length section 14 -Dial counter 15 -Dial 16 -Viewing window 17 -Torque mechanism 18 -Drive shaft 19 -Cylinder sleeve 20 -Ring collar 21 -Axle section 22 -End section 23 -Release mechanism 24 -Coupling 25 -Coupling component 26 -Counter-coupling component 27 -Toothing 28 -Base v. 19 29 -Thrust bearing 30 -Adjustment arrangement 31 -Adjustment coupling 32 -Adjusting shaft 33 -Freewheel mechanism 34 -Inner shaft 35 -Outer ring 36 -Shift cage 37 -Output end v. 19 38 -Clamping element 39 -Shaft section 40 -Recess 41 -Cylinder section 42 -Flat surface 43 -Inner circumferential surface 44 -Contact edge 45 -Detent device 46 -Borne 47 -Spring 48 -Detent element 49 -Detent 50 -Retaining ring 51 -Groove 52 -Flange 53 -Pin 54 -Borne 55 -Cover 56 -Flange body 57 -Stud section 58 -Joining elements 59 -Front cylinder section 60 -Recess 61 -Slot v. 55 62 -Stop surfaces 63 -Detent elements 64 -Groove 65 -Driver 66 -Switching body 67 -Detent lugs 68 -Recesses 69 -Output section 70 -Internal polygonal mount 71 -Polygonal section 72 -Tool 73 -Slot 74 -Inner side 75 -Outer side 76 -Pull sleeve 77 -Detent spring 78 -Flange 79 -Opening 80 -Plug body 81 -Recess 82 -Center section 83 -Helix section 84 -Leg 85 -Groove 86 -Ring element 87 -Detent groove 88 -Compression spring 89 -Inner edge 90 -Outer polygon 91 -Detent arrangement LA -longitudinal axis N -neutral position R -first clamping position L -second clamping position

Claims

1. A torque screwdriver (1), which has a handle (2) and a display (3) for a set torque and an output (4), wherein a setting device (5) for setting a torque and a torque mechanism (17) are arranged in the handle (2), wherein the torque mechanism (17) has a driveshaft (18) for transmitting a torque and a release mechanism (23) for interrupting a torque transmission when a set torque is reached, wherein the release mechanism (23) has a clutch (24), which interrupts the torque transmission upon reaching a set torque, wherein the clutch (24) has a first clutch part (25) and a second counter-coupling part (26), which are coupled in a formfitting manner via a toothing (27), characterized in that the driveshaft (18) and the output (4) are coupled via a freewheel mechanism (33), wherein the freewheel mechanism (33) has an inner shaft (34), an outer ring (35), a switching cage (36) and at least one clamping body (38), in particular a clamping roller, wherein the switching cage (36) is arranged on a shaft section (39) of the inner shaft (34) and the clamping body (38) is arranged in a recess (40) in a cylinder section (41) of the switching cage (36) and the outer ring (35) is at least indirectly connected to the driveshaft (18), wherein the clamping body (38) in a clamping position (R, L) generates a torque between the outer ring (35) and the inner shaft (34) and wherein a collar (52) is provided on the driveshaft-side end section of the inner shaft (34), which collar is supported on a base (28) of the outer ring (35) or a cylinder sleeve (19), and a pin (53) is provided on the driveshaft-side end section of the inner shaft (34), which pin projects into a central bore (54) in the base (28).

2. The torque screwdriver according to claim 1, characterized in that the clamping body (38) is supported on a flat surface (42) of the shaft section (39) and on an inner peripheral surface (43) of the outer ring (35).

3. The torque screwdriver according to any one of claims 1 or 2, characterized in that the freewheel mechanism (33) is switchable, wherein the switching cage (36) is rotatable relative to the inner shaft (34) and / or the outer ring (35), and the clamping body (38) is thereby movable from a neutral position (N), in which a torque can be transmitted in both directions of rotation, wherein, in the first clamping position (R), a torque is transmitted in a first direction of rotation (tightening direction), and in the second clamping position (L), a torque is transmitted in a second direction of rotation (loosening direction), wherein in the respective opposite direction (freewheeling direction) of the first direction of rotation or the second direction of rotation no torque is transmitted.

4. The torque screwdriver according to claim 3, characterized in that locking devices (45) are provided, which are configured and intended to secure the switching cage (36) in the neutral position (N), the first clamping position (R) or the second clamping position (L).

5. The torque screwdriver according to claim 4, characterized in that a locking device (45) has a locking element (48), arranged in a radial bore (46) of the inner shaft (34) with the inclusion of a spring (47) and notches (49), provided on the switching cage (36).

6. The torque screwdriver according to any one of claims 1 to 5, characterized in that a switching body (66) is provided, in particular a switching ring or a switching disc, wherein the switching body (66) is configured and intended to switch the switching cage (36).

7. The torque screwdriver according to any one of claims 1 to 6, characterized in that the switching cage (36) is axially secured by a retaining ring (50) in a groove (51) of the inner shaft (34).

8. The torque screwdriver according to any one of claims 1 to 7, characterized in that a cover (55) is arranged on the output side of the switching cage (36), which is fixed to the handle (2) and the switching cage (36) has a collar body (56) which is supported on the cover (55).

9. The torque screwdriver according to claim 8, characterized in that the cover (55) has a nozzle section (57), wherein, on the nozzle section (57), joining elements (58) are provided, in particular cutting teeth or strips, for frictionally and formfittingly fixing the cover (55) in a front cylinder section (59) of the handle (2).

10. The torque screwdriver according to any one of claims 1 to 9, characterized in that the inner shaft (34) has an output section (69) which can be coupled to the output (4) or on which the output (4) is formed.

11. The torque screwdriver according to any one of claims 1 to 10, characterized in that the output (4) has a tool holding system (12).

12. The torque screwdriver according to claim 10 and 11, characterized in that the output section (69) has an internal polygonal receptacle (70) and, in the area of the internal polygonal receptacle (70), a slot (73), oriented transversely to the longitudinal extent of the output section (69), and the tool holding system (12) has a tension sleeve (76), arranged on the output section (69), so as to be displaceable to a limited extent and a detent spring (77), wherein the tension sleeve (76) has a front collar (78) and a rear plug body (80) and the detent spring (77) has a spiral section (83) and a straight leg (84), wherein the detent spring (77) with the spiral section (83) engages around the output section (69) on the outside and is supported on a ring element (86) and the leg (84) engages through the slot (73) into the internal polygonal receptacle (70), wherein the leg (84) is intended and arranged to hold a tool (72), inserted into the internal polygonal receptacle (70) in a counter-supporting manner, and a compression spring (88) is arranged on the side of the ring element (86), opposite the detent spring (77), and the tension sleeve (76) surrounds the detent spring (77) and the compression spring (88) on the outside and the compression spring (88) rests against the plug body (80), wherein the detent spring (77) can be unlocked by pulling back the tension sleeve (76), in which an inner edge (89) of the front collar (78) displaces the detent spring (77) so that the leg (84) releases a tool (72).

13. The torque screwdriver according to claim 12, characterized in that the slot (73) extends obliquely backwards from an inner side (74) of the internal polygonal receptacle (70) to an outer side (75) of the output section (69).

14. The torque screwdriver according to any one of claims 1 to 13, characterized in that the setting device (5) has a pre-tensionable compression spring (6), a setting nut (7) and a setting screw (8) and the setting device (5) cooperates with a setting body (9) rotatable about the longitudinal axis (LA) of the handle (2) for setting a torque.

15. The torque screwdriver according to any one of claims 1 to 14, characterized in that the display (3) has a numeric roller counter (14), arranged in a hollow cylindrical longitudinal section (13) of the handle (2).

16. The torque screwdriver according to any one of claims 1 to 15, characterized in that an adjustment arrangement (30) is integrated via which an adjustment of the torque setting can be carried out.