Adjustment tool for setting the torque

Abstract

The invention relates to a tool for adjusting torque, comprising an inner tube (10) to which a front fine-adjustment shaft (20) is screwed, wherein a spring (30), an upper toothed piece (40), a lower toothed piece (50), a plurality of steel balls (60), a central shaft (70), and an adjustment unit (80) are arranged in the inner tube (10), wherein a through-hole (41) is arranged in the center of the upper toothed piece (40) and a plurality of ball receptacles (42) are arranged annularly on one end face thereof, wherein a polygonal through-hole (51) is arranged in the center of the lower toothed piece (50) and a plurality of tooth receptacles (52) and a plurality of tooth segments (53) are arranged alternately on one end face thereof, wherein the tooth receptacles (52) and the ball receptacles (42) together serve to receive the steel balls (60).wherein the lower toothed piece (50) and the upper toothed piece (40) are locked together by means of the steel balls (60).

Description

Technical field

[0001] The invention relates to an overload-protected adjusting tool for adjusting the torque according to the preamble of claim 1. State of the art

[0002] A device for adjusting torque is known from German patent application I444262 B. The device comprises an inner tube 1, a front fine-adjustment rod 2, a spring 3, an upper toothed section 4, a lower toothed section 5, a stopper 6, a pressing element 7, an adjusting knob 8, and a coupling element 9. A cylinder 10 is arranged at one end of the inner tube 1, and a polygonal body 11 is arranged at the other end. The polygonal body 11 is hexagonal. An internal threaded bore 12 is arranged inside the cylinder 10 of the inner tube 1, with a fine-adjustment locking hole 13 on the wall of the cylinder 10, which communicates with the internal threaded bore 12. A receiving chamber 14 is arranged inside the polygonal body 11, on the wall of which an internal screw thread section 15 is arranged.A polygonal through-hole 16, for example hexagonal, is arranged between the receiving chamber 14 and the inner threaded bore 12 of the inner tube 1. A sliding recess 17, which communicates with the receiving chamber 14, is arranged on the wall of the polygonal body 11 of the inner tube. A locking screw 18 is arranged in the sliding recess 17. The front fine-adjustment rod 2 is arranged at the front end of the inner tube 1. An outer threaded section 20 is arranged on the outer wall of the rod, and a stepped through-hole 21 is arranged inside the outer wall of the rod 2. The spring 3 is arranged in the polygonal through-hole 16 of the inner tube 1 and in the stepped through-hole 21 of the front fine-adjustment rod 2.The upper toothed piece 4 is arranged in the receiving chamber 14 and the polygonal through-hole 16 of the inner tube 1 and is polygonal in design corresponding to the polygonal through-hole 16 of the inner tube 1, wherein a through-bore 4 is provided on the upper toothed piece 4 and a plurality of upper pawls 41 are arranged on one side of the upper toothed piece 4, wherein one side surface of the upper pawl 41 is vertical and the other side surface of the same is inclined.The lower toothed section 5 is arranged in the receiving chamber 14 of the inner tube 1 and engages with the upper toothed section 4. A polygonal through-bore 50 is provided on the lower toothed section 5. A plurality of lower pawls 51 are arranged on the contact surface of the lower toothed section 5 where it abuts the upper toothed section 4. One side surface of the lower pawl 51 is vertical, and the other side surface is inclined. The stopper 6 is arranged in the receiving chamber 14 of the inner tube 1 and is located on one side of the lower toothed section 5. The stopper 6 has a through-bore 60 and a threaded bore 61 on its wall surface.The pressing element 7 is arranged in the inner threaded section 15 of the receiving chamber 14 of the inner tube 1, wherein a polygonal through-bore 70 is provided on the pressing element 7 and an outer threaded section 71 is arranged on the outer wall surface of the pressing element 7. The adjusting knob 8 is arranged at the rear end of the inner tube 1 and is made of insulating material. A polygonal recess 80, which is, for example, rectangular, is arranged on the outer end face of the adjusting knob 8. In addition, a scale and numbers 81 are arranged in an annular form on the outer end face of the adjusting knob 8. Two inserts 82 are arranged opposite each other on the outer wall surface of the adjusting knob 8. A polygonal receptacle 83 is arranged on the inner end face of the adjusting knob 8, in which a polygonal positioning projection 84 is arranged.The coupling element 9 is arranged in the polygonal receptacle 83 of the rotary knob 8 and is profiled with a polygonal profile corresponding to the polygonal receptacle 83. A polygonal recess 90 is arranged on one end face of the coupling element 9 and a polygonal connecting rod 91 is arranged at the other end of the coupling element 9.

[0003] When using the conventional adjusting device of the type mentioned above, a torque value must first be set. A multi-sided tool is inserted into the multi-sided receptacle 80 on the outer face of the adjusting knob 8 to cause the adjusting knob 8 to rotate. As the adjusting knob 8 is turned, the coupling element 9 is set in motion, which in turn causes the pressing element 7 to rotate. Because the outer threaded section 71 is screwed together with the inner threaded section 15 of the inner tube 1, the pressing element 7 moves inwards or outwards in a screwing motion. If the set torque value is high, the pressing element 7 rotates inwards and pushes the stopper 6 in such a way that the stopper 6 is also moved inwards.Now, the stopper 6 presses the lower toothed piece 5 against the upper toothed piece 4 such that the lower toothed piece 5 rests more closely against the side wall of the lower toothed piece 4, and the upper toothed piece 4 is elastically loaded by the spring 3 so that the lower pawls 51 of the lower toothed piece 5 and the upper pawls 41 of the upper toothed piece 4 engage even more tightly. If the applied torque value is small, the pressing element 7 moves outwards such that the stopper 6, together with the lower toothed piece 5 and the upper toothed piece 4, is elastically pressed by the spring 3 and simultaneously moves outwards, whereby the engagement of the lower toothed piece 5 and the upper toothed piece 4 is less tight.The magnitude of the applied torque depends on the displacement distance of the stopper 6, and the displacement distance of the stopper 6 in turn depends on the displacement distance of the locking screw 18 in the sliding recess 17 of the inner tube 1. Thus, the torque adjustment process can be controlled.

[0004] However, the following defects were observed when using the conventional adjusting device of the type mentioned above. The upper pawls 41 of the upper toothed piece 4 and the lower pawls 51 of the lower toothed piece 5 are used as adjusting elements to set the torque value. The load-bearing areas of the inclined surfaces of the upper pawls 41 and the lower pawls 51 are small, leading to unreliable force transmission. If the applied force is greater than the set torque value, the upper toothed piece 4 and the lower toothed piece 5 must disengage by the teeth skipping, resulting in a free play. Due to the high frictional resistance of the inclined surfaces, the upper pawls 41 and the lower pawls 51 cannot disengage easily. This impairs the sensitivity of the overload protection.

[0005] Furthermore, screwdrivers or ratchet wrenches with torque adjustment are known from DE 10 2013 009 358 A1, DE 10 2012 020 909 B3 and DE 20 2009 012 900 U1. Object of the invention

[0006] The invention is based on the objective of creating an adjustment tool for setting the torque that avoids the disadvantages associated with the prior art. Technical solution

[0007] This problem is solved according to the invention by an adjustment tool for setting the torque with the features of claim 1. Advantageous embodiments are the subject of the dependent claims.

[0008] The invention provides an adjusting tool for torque adjustment, comprising an inner tube, a front fine-adjustment shaft, a spring, an upper toothed section, a lower toothed section, a plurality of steel balls, a central shaft, and an adjustment unit. An internal threaded bore is arranged in one end of the inner tube, and a receiving chamber is arranged in the other end. A first internal thread and a second internal thread are arranged on the wall surface of the receiving chamber. The receiving chamber and the inner threaded bore are connected via a polygonal opening. At least one sliding recess is arranged on the wall surface of the inner tube, leading into the receiving chamber. At least one screw is arranged in the sliding recess. The front fine-adjustment shaft has an open end and a closed end, with a threaded section arranged on the outer wall of the open end.By screwing the threaded section together with the inner threaded bore, the front fine-adjustment shaft is connected to the inner tube by means of screws. A through-hole runs through the center of the closed end. This allows a tool shaft, such as a screwdriver bit, to be inserted into the inner tube through the through-hole. The spring is located inside the inner tube, with one end of the spring resting against the closed end of the front fine-adjustment shaft. A through-hole is located in the center of the upper toothed section, and a multitude of ball receptacles are arranged in a ring on one end face of the upper toothed section. The upper toothed section is received in the receiving chamber and the polygonal opening of the inner tube and rests against the other end of the spring. The upper toothed section has a polygonal profile corresponding to the polygonal opening of the inner tube.A polygonal through-hole is located in the center of the lower toothed section. A plurality of tooth receptacles and a plurality of tooth segments are arranged alternately on one end face of the lower toothed section. The lower toothed section is positioned in the receiving chamber of the inner tube, with the tooth receptacles of the lower toothed section and the ball receptacles of the upper toothed section together serving to hold the steel balls. The steel balls lock the lower and upper toothed sections together. A polygonal drive hole runs through the center of the central shaft. The central shaft is inserted through the polygonal through-hole of the lower toothed section and the through-hole of the upper toothed section, so that the central shaft is held by the adjusting unit between the adjusting unit and the lower toothed section.A polygonal body, profiled to match the polygonal through-hole, is arranged on the outer wall of the central axis. The polygonal body and the polygonal through-hole fit together. The tool shank, guided through the through-hole, is then inserted into the drive hole and positioned therein in such a way that the lower toothed section, the central axis, and the tool shank are coupled together. The adjusting unit comprises a locking ring, a pressing element, and a stop ring. At least one threaded bore is arranged on the outer wall of the locking ring, and the locking ring is restricted in the receiving chamber by screwing the screw into the threaded bore. A first external thread is arranged on the pressing element, and a second external thread is arranged on the stop ring. The first external thread can be screwed into the first internal thread, and the second external thread can be screwed into the second internal thread.A polygonal hole runs through the center of the pressing element.

[0009] Thus, an adjustment tool for setting the torque is constructed.

[0010] The torque setting tool according to the invention is characterized in that the arcuate surface of the outer circumference of the steel ball has a larger load-bearing area compared to the inclined surface. This contributes to a more reliable transmission of force when the upper and lower toothed sections are locked together by means of the steel balls. Furthermore, the rolling motion of the steel balls results in lower frictional resistance, allowing the steel balls to be more easily removed from the toothed receptacles. This ensures high sensitivity of the overload protection. Brief description of the drawings Fig. Figure 1 shows a perspective view of an adjustment tool according to the invention for adjusting the torque in the assembled state. Fig. Figure 2 shows an exploded view of the adjusting tool according to the invention. Fig. 1. Fig. Figure 3 shows a sectional view of the adjusting tool according to the invention. Fig. 1 in the assembled state. Fig. Figure 4 shows a schematic representation of the torque setting using the adjusting tool according to the invention. Fig. Figure 5 shows a schematic representation of the force transmission in the adjusting tool according to the invention. Fig. Figure 6 shows a schematic representation of the overload protection in the adjusting tool according to the invention. Fig. Figure 7 schematically shows another preferred embodiment of the adjusting tool according to the invention. Detailed description of preferred embodiments

[0011] The following section will explain in more detail the tasks, features, and advantages of the present invention with reference to a detailed description of exemplary embodiments and the accompanying drawings. However, the invention is not limited to the description of these exemplary embodiments and their representation in the accompanying drawings.

[0012] As in Fig. 1 to Fig. As shown in Figure 3, the invention relates to an adjusting tool for adjusting the torque, comprising an inner tube 10, a front fine-adjustment shaft 20, a spring 30, an upper toothed section 40, a lower toothed section 50, a plurality of steel balls 60, a central shaft 70, and an adjusting unit 80. An internal threaded bore 101 is arranged in one end of the inner tube 10, and a receiving chamber 102 is arranged in the other end, with a first internal thread 103 and a second internal thread 104 being arranged on the wall surface of the receiving chamber 102. The receiving chamber 102 and the internal threaded bore 101 are connected via a polygonal opening 105. At least one sliding recess 106 is arranged on the wall surface of the inner tube 10, leading into the receiving chamber 102. At least one screw 11 is arranged in the sliding recess 106.The front fine-adjustment shaft 20 has an open end and a closed end, with a threaded section 21 arranged on the outer wall of the open end. By screwing the threaded section 21 into the inner threaded bore 101, the front fine-adjustment shaft 20 is connected to the inner tube 10 by means of screws. A through-hole 22 extends through the center of the closed end. A tool shaft A, such as a screwdriver bit, can thus be inserted into the inner tube 10 through the through-hole 22. The spring 30 is arranged inside the inner tube 10, with one end of the spring 30 resting against the closed end of the front fine-adjustment shaft 20. A through-hole 41 is arranged in the center of the upper toothed section 40, and a plurality of ball receptacles 42 are arranged in an annular pattern on one end face of the upper toothed section 40.The upper toothed piece 40 is received in the receiving chamber 102 and the polygonal opening 105 of the inner tube 10 and rests against the other end of the spring 30. The upper toothed piece 40 has a polygonal profile corresponding to the polygonal opening 105 of the inner tube 10. A polygonal through-hole 51 is arranged in the center of the lower toothed piece 50.

[0013] A plurality of tooth receptacles 52 and a plurality of tooth segments 53 are arranged alternately on one end face of the lower toothed piece 50. The lower toothed piece 50 is arranged in the receiving chamber 102 of the inner tube 10, with the tooth receptacles 52 of the lower toothed piece 50 and the ball receptacles 42 of the upper toothed piece 40 together serving to receive the steel balls 60. The lower toothed piece 50 and the upper toothed piece 40 are locked together by means of the steel balls 60. A polygonal drive hole 71 runs through the center of the central axis 70. The central axis 70 is inserted through the polygonal through hole 51 of the lower toothed piece 50 and the through hole 41 of the upper toothed piece 40, so that the central axis 70 is held by the adjusting unit 80 between the adjusting unit 80 and the lower toothed piece 50.A polygonal body 72 is arranged on the outer wall of the central axis 70, its profile corresponding to the polygonal through-hole 51. The polygonal body 72 and the polygonal through-hole 51 fit together. The tool shank A, guided over the through-opening 22, is then inserted into the drive hole 71 and positioned therein in such a way that the lower toothed piece 50, the central axis 70, and the tool shank A are coupled together (see figure 50). Fig. 5 and Fig. 6) The adjusting unit 80 comprises a locking ring 81, a pressing element 82, and a stop ring 83, wherein at least one threaded bore 811 is arranged on the outer wall of the locking ring 81, and the locking ring 81 is restricted in the receiving chamber 102 by screwing the screw 11 into the threaded bore 811. A first external thread 821 is arranged on the pressing element 82 and a second external thread 831 is arranged on the stop ring 83, wherein the first external thread 821 can be screwed together with the first internal thread 103 and the second external thread 831 with the second internal thread 104. A polygonal hole 822 extends through the center of the pressing element 82.

[0014] According to the invention, two sliding recesses 106 are arranged in the inner tube 10 and two threaded bores 811 are arranged on the locking ring 81.

[0015] According to the invention, a screw 11 is arranged in one sliding recess 106, while a screw 11 and a spring leaf 12 are arranged in the other sliding recess 106.

[0016] According to the invention, the polygonal opening 105 is profiled hexagonally corresponding to the upper toothed piece 40, the polygonal through hole 51 and the polygonal body 72.

[0017] According to the invention, the drive hole 71 and the polygonal hole 822 have a hexagonal profile.

[0018] According to the invention, one side surface of the respective tooth receptacle 52 is vertical and the other side surface of the same is inclined.

[0019] According to the invention, a groove 531 is formed on the end face of each toothed section 53, which is provided to restrict the movement of the steel ball 60 in order to prevent the steel ball 60 from unintentionally exiting the space between the lower toothed section 50 and the upper toothed section 40 during the rolling process. At the same time, the two tooth receptacles 52 on both sides of the toothed section 53 are connected by the groove 531.

[0020] According to the invention, the lower toothed piece 50 and the central shaft 70 are manufactured separately (see also Fig. 2).

[0021] According to the invention, the lower toothed piece 50 and the central shaft 70 are manufactured in one piece (see also Fig. 7).

[0022] To use the adjusting tool according to the invention, a polygonal tool is inserted into the polygonal hole 822 of the pressing element 82 via the stop ring 83 and rotated (see also Fig. 4) so ​​that the pressing element 82 can be rotated into or out of the inner tube 10 by means of the screw connection of the first external thread 821 and the first internal thread 103. At a high applied torque, the pressing element 82 rotates inwards, thereby pushing the locking ring 81 such that the locking ring 81 is displaced. Furthermore, the locking ring 81 pushes the lower toothed piece 50 so that the lower toothed piece 50 rests closer to the upper toothed piece 40. The upper toothed piece 40 is subjected to the spring force of the spring 30, so that the lower toothed piece 50 and the upper toothed piece 40 are locked more tightly and securely to each other by means of the steel balls 60. At a low applied torque, the pressing element 82 is moved outwards.The locking ring 81, the lower toothed piece 50, and the upper toothed piece 40 are subjected to the spring force of the spring 30 and are thereby also displaced outwards. The locking of the lower toothed piece 50 and the upper toothed piece 40 is now not tight and secure, and the torque is small. If the tool shank A is forced to rotate with a force greater than the applied torque (see also...), Fig. 5), the steel balls 60 are disengaged from the toothed receptacles 52, creating a free play. This prevents the lower toothed piece 50 and the upper toothed piece 40 from being locked against each other by the steel balls 60. In this way, overload protection is ensured (see also Fig. 6).

[0023] The torque adjustment tool according to the invention is characterized in that the arcuate surface of the outer circumference of the steel ball 60 has a larger load-bearing area compared to the inclined surface. This contributes to a more reliable transmission of force when the upper toothed section 40 and the lower toothed section 50 are locked together by means of the steel balls 60. Furthermore, the rolling motion of the steel balls 60 results in lower frictional resistance, so that the steel balls 60 are more easily removed from the toothed receptacles 52. This ensures high sensitivity of the overload protection.

[0024] Although the present invention has been described in detail with reference to exemplary embodiments, it is obvious to those skilled in the art that the invention is not limited to these exemplary embodiments, but rather that modifications are possible in such a way that individual features can be omitted or different combinations of features can be implemented, as long as the scope of protection of the appended claims is not exceeded. The disclosure of the present invention includes all combinations of the individual features presented. Reference symbol list 10 inner tube 101 internal threaded hole 102 Admissions Chamber 103 first internal thread 104 second internal thread 105 multi-sided opening 106 Sliding recess 11 screw 12 leaf springs 20 front fine adjustment shaft 21 Thread section 22 Passage opening 30 springs 40 upper toothed piece 41 Through hole 42 ball mount 50 lower toothed piece 51 Polygonal through hole 52 Tooth X-ray 53 tooth part 531 gutter 60 steel balls 70 Center axis 71 Drive hole 72 polygonal bodies 80 setting unit 81 Locking ring 811 Threaded hole 82 Press element 821 first external thread 822 Multi-sided hole 83 Stop ring 831 second external thread A tool shank

Claims

[1] Torque adjustment tool comprising an inner tube (10), a front fine adjustment shaft (20), a spring (30), an upper toothed piece (40), a lower toothed piece (50), a plurality of steel balls (60), a central axis (70) and an adjustment unit (80), characterized by , that an internal threaded bore (101) is arranged in one end of the inner tube (10) and a receiving chamber (102) is arranged in the other end thereof, wherein a first internal thread (103) and a second internal thread (104) are arranged on the wall surface of the receiving chamber (102), wherein the receiving chamber (102) and the internal threaded bore (101) are connected via a polygonal opening (105), wherein at least one sliding recess (106) is arranged on the wall surface of the inner tube (10), which leads into the receiving chamber (102), wherein at least one screw (11) is arranged in the sliding recess (106); that the front fine adjustment shaft (20) has an open end and a closed end, wherein a threaded portion (21) is arranged on the outer wall of the open end, wherein, because the threaded portion (21) can be screwed together with the inner threaded bore (101), the front fine adjustment shaft (20) can be connected to the inner tube (10) by means of screws, wherein a through opening (22) runs through the center of the closed end, so that a tool shaft (A) can be inserted into the inner tube (10) via the through opening (22); that the spring (30) is arranged inside the inner tube (10), one end of the spring (30) resting against the closed end of the front fine adjustment shaft (20); that a through hole (41) is arranged in the center of the upper toothed piece (40) and a plurality of ball receptacles (42) are arranged in a ring shape on one end face of the upper toothed piece (40), wherein the upper toothed piece (40) is received in the receiving chamber (102) and the polygonal opening (105) of the inner tube (10) and rests against the other end of the spring (30); that the upper toothed piece (40) is profiled in a polygonal manner corresponding to the polygonal opening (105) of the inner tube (10); that a polygonal through-hole (51) is arranged in the center of the lower toothed piece (50), wherein a plurality of tooth receptacles (52) and a plurality of tooth parts (53) are arranged alternately on an end face of the lower toothed piece (50), wherein the lower toothed piece (50) is arranged in the receiving chamber (102) of the inner tube (10), wherein the tooth receptacles (52) of the lower toothed piece (50) and the ball receptacles (42) of the upper toothed piece (40) together serve to receive the steel balls (60), wherein the lower toothed piece (50) and the upper toothed piece (40) are locked to one another by means of the steel balls (60); that a polygonal driving hole (71) runs through the center of the central axis (70), wherein the central axis (70) is inserted through the polygonal through-hole (51) of the lower toothed piece (50) and the through-hole (41) of the upper toothed piece (40), so that the central axis 70 is held by the adjustment unit (80) between the adjustment unit (80) and the lower toothed piece (50), wherein a polygonal body (72) is arranged on the outer wall of the central axis (70), which is profiled corresponding to the polygonal through-hole (51), wherein the polygonal body (72) and the polygonal through-hole (51) fit into one another, wherein the tool shank (A) guided over the through-opening (22) is then inserted into the driving hole (71) and mounted therein in such a way that the lower toothed piece (50), the central axis (70) and the tool shank (A) are coupled together; and that the adjustment unit (80) has a locking ring (81), a pressing element (82) and a stop ring (83), wherein at least one threaded bore (811) is arranged on the outer wall of the locking ring (81), wherein the locking ring (81) is restricted in the receiving chamber (102) by screwing the screw (11) into the threaded bore (811), wherein a first external thread (821) is arranged on the pressing element (82) and a second external thread (831) is arranged on the stop ring (83), wherein the first external thread (821) can be screwed together with the first internal thread (103) and the second external thread (831) can be screwed together with the second internal thread (104), wherein a polygonal hole (822) runs through the center of the pressing element (82). [2] Adjustment tool according to claim 1, characterized by that two sliding recesses (106) are arranged in the inner tube (10) and two threaded holes (811) are arranged on the locking ring (81). [3] Adjustment tool according to claim 2, characterized by , in one sliding recess (106) a screw (11) is arranged, while in the other sliding recess (106) a screw (11) and a spring leaf (12) are arranged. [4] Adjustment tool according to claim 1, characterized by that the polygonal opening (105) is hexagonally profiled corresponding to the upper toothed piece (40), the polygonal through-hole (51) and the polygonal body (72). [5] Adjustment tool according to claim 1, characterized by that the driver hole (71) and the polygonal hole (822) are hexagonally profiled. [6] Adjustment tool according to claim 1, characterized by that one side surface of the respective tooth receptacle (52) is vertical and the other side surface thereof is inclined. [7] Adjustment tool according to claim 1, characterized bythat a groove (531) is formed on the end face of the respective tooth part (53), which groove is provided for restricting the movement of the steel ball (60) in order to prevent an unintentional exit of the steel ball (60) during the rolling process from the space between the lower toothed piece (50) and the upper toothed piece (40), wherein the two tooth receptacles (52) on both sides of the tooth part (53) are connected by the groove (531). [8] Adjustment tool according to claim 1, characterized by that the lower toothed piece (50) and the central axis (70) are manufactured separately. [9] Adjustment tool according to claim 1, characterized by that the lower toothed piece (50) and the central axis (70) are made in one piece.

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