Load contact arrangement and screw tool for manufacturing the load contact arrangement

Abstract

A load contact arrangement (5) for a connector part (6) comprises: a contact pin (2) with a pin body (20) having a cylindrical section (200) extending along an axis (A) and an adjacent thread (201), and a load contact (3) for establishing an electrical connection, with a receptacle (30) and a thread (31) accessible via the receptacle (30), wherein the thread (201) of the pin body (20) is screwed to the thread (31) of the load contact (3) and the surface (203) of the pin body (20) extends from the cylindrical section (200) to an end (202) of the pin body (20) facing away from the thread (201) in accordance with a surface of revolution around the axis (A).

Description

[0001] The invention relates to a load contact arrangement for a connector part according to claim 1, a connector part for electrically contacting a mating connector part, furthermore a screw tool for manufacturing a load contact arrangement, a set and a method for manufacturing a load contact arrangement.

[0002] Load contacts are used, for example, on connector components to electrically connect with contacts of a mating connector component, thus enabling current flow. In charging plugs for electric vehicles or other connector components carrying high currents, the load contacts are sometimes so large that an object, or even a finger, could accidentally be inserted into a receptacle of the load contact. To prevent this, an electrically insulating pin can be placed in the receptacle.

[0003] US Patent 5,588,852 A describes such a load contact with an insulating pin that prevents accidental insertion of a test object. However, the pin's fit on the load contact is not sufficiently secure for some applications.

[0004] In DE 10 2020 112 117 A1 a load contact with an electrically conductive contact pin is described, at the end of which an insulating touch guard is attached.

[0005] DE 197 26 517 A1 describes a component with a contact housing made of conductive metal, containing a threaded bore that opens into a recess at one end. The component includes a conductive metal contact pin with an externally threaded shaft that is screwed into the bore. The contact pin serves a completely different purpose than described in the aforementioned documents. In this case, the contact pin is installed using a screw-in tool with four longitudinally projecting teeth that engage in recesses on the contact pin to allow it to be rotated.

[0006] The object of the present invention is to facilitate the assembly of a load contact arrangement with a load contact and a contact pin.

[0007] This problem is solved by an object having the features of claim 1.

[0008] Accordingly, a load contact arrangement for a connector component comprises a contact pin and a load contact. The contact pin includes a pin body having a cylindrical section extending along an axis and an adjacent thread. The load contact is designed to establish an electrical connection and has a receptacle and a thread accessible via the receptacle. The thread of the contact pin is screwed into the thread of the load contact. The surface of the pin body extends along the cylindrical section and / or from the cylindrical section (and including the cylindrical section) to an end of the pin body facing away from the thread of the pin body, following a surface of revolution around the axis. Adjacent to the thread, the surface of the remaining contact pin extends along the surface of revolution around the axis.

[0009] Since the pin body is screwed to the load contact, a secure fit is ensured. By eliminating eccentric surface areas and features such as wrench flats or similar components for a socket wrench, the pin body's manufacture is particularly simple. This eliminates the need for machining to create such features, thus simplifying production. During assembly, the pin body is held in place by friction rather than a positive fit. Apart from the thread, and / or excluding the thread, the remaining surface of the pin body, including the cylindrical section and extending to an end opposite the thread, has a circular (especially full-circle) cross-section at every point.

[0010] An electrically insulating cap can be mounted at the end of the pin body that faces away from the thread. This prevents not only a person from accidentally inserting a finger or object into the load contact receptacle, but also from accidentally touching electrically conductive areas of the load contact assembly. Alternatively, the entire contact pin can be electrically insulating or covered with an electrically insulating coating.

[0011] The load contact can have several contact arms arranged concentrically around its axis. These arms project, for example, from a base of the load contact. A recess can be formed in this base. The thread of the load contact can be provided in this recess, for example, in the form of a bore. The contact arms, for instance, form the receptacle for the load contact. The contact arms can, by means of spring elasticity, mechanically and electrically contact parts of a mating contact that can be connected to the load contact assembly. In this way, reliable contact can be achieved.

[0012] For example, the body of the contact pin is formed in one piece. This makes the pin body particularly easy to manufacture.

[0013] Alternatively or additionally, the body of the contact pin can be electrically conductive. The pin body comprises, for example, a metal (e.g., iron, copper, tin, and / or zinc) or a metal alloy (e.g., steel, especially stainless steel, or a copper alloy). In this way, the pin body can contribute to electrical conductivity. Furthermore, this ensures high stability. A coating, e.g., with silver, can also be provided.

[0014] The thread of the pin body can be designed as an external thread. This allows for simple manufacturing and a robust design of the pin body.

[0015] According to one aspect, a connector part for electrically contacting a matching mating connector part is specified, comprising several load contact arrangements, each according to any one of the embodiments described herein. Regarding the advantages, reference is made to the information above.

[0016] According to one aspect, a screw tool for screwing a contact pin to an electrical load contact (in particular for screwing it into the load contact) to produce a load contact arrangement according to any of the embodiments described herein is specified. The screw tool comprises: a holder with a receptacle, at least one freewheel fixedly inserted in the receptacle, wherein the at least one freewheel has a receptacle (i.e., the receptacle of the freewheel is arranged in the receptacle of the holder). A cylindrical section of the contact pin can be inserted into the receptacle of the at least one freewheel, such that rotation of the holder in one direction about the axis relative to the inserted contact pin is permitted by the at least one freewheel, and rotation in the other (opposite) direction about the axis relative to the inserted contact pin is blocked by the at least one freewheel.Furthermore, the screwdriving tool may include an interface firmly connected to the holder for transmitting a torque around the axis to the holder.

[0017] This screw tool allows the rotating surface, particularly the cylindrical section, to be screwed (especially screwed in) in a force-fit manner. To remove the screw tool, it can simply be turned in the opposite direction, which does not loosen the screw connection but rather opens at least one freewheel, allowing it to be pulled off axially. In this way, a contact pin that has no wrench flats (or other surfaces other than a rotating surface) besides a thread can be screwed in easily and securely.

[0018] For example, at least one freewheel is firmly connected to the holder by a press fit and / or adhesive. This allows for quick and easy manufacturing while simultaneously ensuring secure fixation of an outer surface of the freewheel to the holder.

[0019] The freewheel can have a cage in which one or more clamping elements are held in such a way that they are movable relative to the cage, e.g., between a clamping position in which they are jammed between the cage and the inserted contact pin, and a release position in which they are movable relative to the contact pin. This ensures a secure clamping action with easy operation.

[0020] For example, the clamping elements are each designed in the form of a roller. For instance, at least one freewheel (in each case) is a needle bearing. This enables precise and secure clamping.

[0021] In one embodiment, the clamping elements are spring-loaded and pre-tensioned into the clamping position. Thus, even a slight rotation can lock the holder relative to the contact pin.

[0022] The screwdriving tool can include two or more freewheels. These are arranged, for example, axially one behind the other in the holder's receptacle. This allows for an even more robust mounting, enabling tightening with high torque.

[0023] For example, the interface is polygonal, particularly in the form of a hexagonal drive. This allows the contact pin to be quickly screwed in, for example, with a motorized screwdriver. Alternatively, the interface can also be designed, for example, as a handle, so that the screw connection can be made manually.

[0024] According to one aspect, a set is specified, comprising: a screw tool according to any of the designs described herein and the contact pin. The contact pin has, for example, a thread. Regarding the advantages, reference is made to the information above.

[0025] The set can also include the load contact. The load contact has, for example, a thread with which the thread of the contact pin can be screwed, in particular to form a load contact arrangement according to any of the embodiments described herein.

[0026] According to one aspect, a method for mounting a contact pin on an electrical load contact to produce a load contact arrangement is specified, in particular for producing a load contact arrangement according to any of the embodiments described herein. The method comprises: inserting a cylindrical section of the contact pin into the receptacle of the holder of the screw tool according to any of the embodiments described herein; rotating the screw tool relative to the load contact by applying a torque to the interface, such that the at least one freewheel locks the contact pin inserted therein relative to the screw tool (e.g., by moving the clamping elements into the clamping position) and the contact pin is screwed to the load contact. Furthermore, the method comprises removing the screw tool from the contact pin, which, for example,This involves rotating the screwdriver in the opposite direction (to the previous rotation) and axially withdrawing the screwdriver. Regarding the advantages, please refer to the information above.

[0027] The underlying concept of the invention will be explained in more detail below with reference to the exemplary embodiments shown in the figures. The figures show: Fig. 1 a view of an embodiment of a connector part in the form of a car charging plug; Fig. 2 a view of a load contact arrangement of the connector part according to Fig. 1; Fig. 3 a sectional view of the load contact arrangement according to Fig. 2; Fig. 4 a view of a contact pin of the load contact arrangement according to Fig. 2; Fig. 5 a view of a screw tool for screwing in the contact pin according to Fig. 4 with an electrical load contact for producing the load contact arrangement according to Fig. 2; Fig. 6 a sectional view of the screwdriving tool according to Fig. 5 with the load contact arrangement according to Fig. 2; Fig. 7 a sectional view of part of the screw tool according to Fig. 5 with two freewheels mounted in one holder; Fig. 8 a perspective view of a freewheel for the screw tool according to Fig. 5; Fig. 9 a schematic sectional view of the freewheel according to Fig. 8; Fig. 10 A view of a charging station with a charging cable attached to it, including the connector part according to Fig. 1 for connecting to an electric vehicle; and Fig. 11 a method for mounting a contact pin on an electrical load contact for producing the load contact arrangement according to Fig. 2.

[0028] Fig. Figure 1 shows a connector part 5, for example in the form of a plug, which is connected to another connector part designed to match it, in this case the one shown in Fig. 10 illustrated mating connector part 7, which can be electrically connected by plugging.

[0029] The connector part 6 is electrically connected to the cable at the end of the cable. The connector part 6 has a handle 62 by which it can be gripped, and a plug-in section 60 which can be inserted into the mating connector part 7.

[0030] The connector part 6 is a vehicle charging plug, more precisely, a charging plug conforming to the North American charging standard (SAE J3400). The connector part 6 has exactly two contacts, which are referred to here as load contacts 3 for ease of reference. The two terminals of a DC or AC voltage can be connected to these load contacts 3 to charge (or discharge) an electric vehicle via the connector part 6. Furthermore, the connector part 6 has additional contacts 61, namely a ground contact and two data contacts. More than 10 kW of electrical power can be supplied via the load contacts 3; in this example, more than 100 kW, in particular more than 200 kW, and especially more than 500 kW. This enables particularly short charging times.

[0031] To allow the correspondingly high electrical currents to flow through the load contacts 3 during the charging process, these contacts are dimensioned accordingly. The opening of the load contacts 3 for inserting a corresponding load contact of the mating connector part can have an opening diameter of more than 5 mm or even more than 1 cm. To prevent a user from accidentally inserting a finger or object into this opening, it is protected, as will be explained below.

[0032] Fig. Figure 2 shows a load contact arrangement 5 with one of the load contacts 3 of the connector part 6.

[0033] The load contact 3 has a receptacle 30 into which the corresponding load contact of the mating connector part can be inserted. The load contact 3 has a base 35, which is connected to a conductor of the cable. Several contact arms 32 extend from the base 35, arranged concentrically around a central axis. The contact arms 32 define the receptacle 30.

[0034] The contact arms 32 are each inclined towards the central axis. Starting from the base 35, the contact arms 32 approach each other in a direction away from the base 35. At their open ends facing away from the base 35, an inner surface extends outwards again from the central axis, forming an insertion ramp. The corresponding load contact of the mating connector part can be inserted through this insertion ramp. The contact arms 32 spring outwards and are preloaded against the load contact of the mating connector part. One or more (here two) O-rings 33 are placed around the tips of the contact arms 32 (in this case, inserted into a respective groove 36). These can be provided to further increase the inward tension of the contact arms 32 towards the central axis.

[0035] The load contact 3 serves to establish an electrical connection with the load contact of the mating connector part.

[0036] The load contact assembly 5 further comprises a contact pin 2. This pin is mounted on the load contact 3 and has an insulating cap 21. The insulating cap 21 extends beyond the tips (the open ends) of the contact arms 32. The contact pin 2 is positioned centrally in the receptacle 30. The contact pin 2 is aligned along the central axis. The contact pin 2 with the insulating cap 21 prevents a finger or object from being inserted into the receptacle 30 of the load contact 3. The insulating cap 21 is made of an electrically insulating material, e.g., plastic. When installed, an insulating housing of the connector part 6 covers the tips of the contact arms 32, thus also protecting them from contact.

[0037] As particularly evident Fig. As can be seen in Figure 3, the contact pin 2 comprises a pin body 20, which has a cylindrical section 200 extending along an axis A and an adjacent thread 201. The contact pin 2 is mounted at the base 35 of the load contact 3. The insulating cap 21 is mounted at the open end 202 of the pin body 20, which faces away from the base 35. The pin body 20 is formed from an electrically conductive material, in this case a metal alloy. In this example, the pin body is made of stainless steel (which may be coated). At end 202, the pin body 20 has a locking element (with a reduced diameter compared to the cylindrical section) with which the insulating cap 21 is locked.

[0038] The thread 201 of the pin body 20 is screwed to a thread 31 of the load contact 3. The thread 31 of the load contact 3 is accessible via the receptacle 30 between the contact arms 32. In this case, the thread 31 of the load contact 3 is formed in a recess 34. The recess 34 is formed in the form of a bore. The recess 34 is formed centrally in a base 300 of the receptacle 30. The cylindrical section 200 has, for example, a larger diameter than the thread 201.

[0039] The contact arms 32 are arranged concentrically around the contact pin 2. Axis A forms the cylinder axis of the cylindrical section 200. Axis A coincides with the aforementioned central axis. The contact arms 32 each extend from the base 300 of the receptacle 30.

[0040] The thread 201 of the pin body 20 is firmly screwed to the thread 31 of the load contact 3.

[0041] As shown by the Fig. 3 and Fig. As can be seen in Figure 4, the surface 203 of the pin body 20 extends from the cylindrical section 200 to the end 202 of the pin body 20 opposite the thread 201 along a surface of revolution around the axis A. The pin body 20 thus has a smooth surface in the circumferential direction around the axis A. The cylindrical section 200 has a circular shape at every point in a section perpendicular to the axis A. In this case, all areas of the pin body 20, with the exception of the thread 201, have a surface of revolution and circular cross-sections at every point.

[0042] Outside the recess 34, the entire pin body 20 is described by a surface of revolution. The entire pin body 20 exposed in the receptacle 30 is described by a surface of revolution.

[0043] The pin body 20 of the contact pin 2 is formed in one piece. Furthermore, the pin body 20 of the contact pin 2 is electrically conductive.

[0044] The thread 201 of the pin body 20 is designed as an external thread, the thread 201 of the contact pin 2 is designed as a corresponding internal thread.

[0045] To easily and securely mount the contact pin 2 to the load contact 3 (and thus create the load contact arrangement 5), a screw tool 1 is provided, which is Fig. Figure 5 illustrates this. The screwing tool 1 can also be called a screw-in tool.

[0046] As especially in the Fig. 5 and Fig. As can be seen in Figure 6, the screw tool 1 includes a holder 10. The holder 10 is cylindrical in shape. The holder has a receptacle 100. The receptacle 100 is accessible at one end face of the holder 10.

[0047] Furthermore, the screw tool 1 comprises at least one freewheel 11 firmly inserted in the receptacle 100, in the example shown two freewheels 11. The freewheels 11 each have a receptacle 110 into which the cylindrical section 200 of the contact pin 2 can be inserted.

[0048] The freewheels 11 allow rotation of the inserted contact pin 2 (around axis A) in one direction, but prevent rotation in the opposite direction. Thus, rotation of the holder 10 around axis A relative to the inserted contact pin 2 (unscrewing the thread 31) is permitted by the freewheels 11 in one direction relative to axis A, while rotation of the holder 10 around axis A relative to the inserted contact pin 2 (tightening the thread 31 into the thread 201) is prevented by the freewheels 11 in the other direction relative to axis A. Therefore, the contact pin 2 can be screwed into the load contact 3 by the screwdriver 1 using frictional engagement via the freewheels 11, without a positive connection.

[0049] The screwdriving tool 1 further comprises an interface 12, here in the form of a tool interface, which is firmly connected to the holder 10, for transmitting a torque about the axis A to the holder 10. In the example shown, the interface 12 is designed in the form of a hexagonal drive, but could also have a different positive locking contour (e.g. a polygon or star).

[0050] Fig. Figure 7 shows the end of the holder 10 with the cylindrical receptacle 100 and the two freewheels 11 arranged therein as an example. The freewheels 11 are arranged adjacent to the opening of the receptacle 100, while the receptacle 100 extends further into the holder 10 behind the freewheels 11. It should be noted that only one freewheel 11 could be provided, or, for a high tightening torque, two or more freewheels 11, e.g., three.

[0051] Each of the freewheels 11 is firmly connected to the holder 10 by means of an interference fit. The holder 10 is, for example, shrink-fitted onto the freewheels 11. Alternatively or additionally, it can be provided that at least one or each of the freewheels 11 is bonded to the holder 10. An adhesive can therefore be applied between at least one or each of the freewheels 11 and the holder 10.

[0052] Each of the freewheels 11 comprises a cage 111 on which several clamping elements 112 are movably mounted. The cage 111 is ring-shaped. The clamping elements 112 are distributed (here, by way of example, equidistant) along the ring shape of the cage 111. In the example according to Fig. 7 Each freewheel 11 has four clamping elements 112, whereby fewer or more than four may also be provided (e.g. according to Fig. 8 and Fig. 9 six clamping elements 112). The cage 111 with the clamping elements 112 of each of the freewheels 11 is mounted in a respective housing 113.

[0053] The clamping elements 112 are each held movably on the cage 111 such that they are movable relative to the cage 111 between a clamping position, in which they are clamped between the cage 111 and the housing 113 on the one hand and the inserted contact pin 2 on the other, and a release position, in which they are movable relative to the contact pin 2. The clamping elements 112 are each pre-tensioned into the clamping position by means of a spring 114.

[0054] If the contact pin 2 is inserted into the screwdriver 1 and the screwdriver 1 is rotated relative to the contact pin 2 in the locking direction, then the clamping elements 112 lock into the clamping position. Rotated in the opposite direction, the clamping elements 112 are moved against the force of the respective spring 114 into the release position.

[0055] As particularly evident Fig. As can be seen in Figure 9, the cage 111 has a track for each clamping element 112, along which the clamping element 112 can be moved or rolled. The track can be inclined relative to a concentric circle, so that when the respective clamping element 112 is moved along the track, it is pressed against the contact pin 2.

[0056] The clamping elements 112 are each designed in the form of a roller and have a circular cylindrical shape. The freewheels 11 can be designed in the form of needle bearings.

[0057] Again with reference to Fig. 6 It should be noted that the screw tool 1 together with the contact pin 2 and / or the load contact 3 forms a set 4 for producing a load contact arrangement 5.

[0058] Set 4 can include, as an alternative or in addition to contact pin 2 and / or load contact 3, a tool W. Tool W comprises, for example, an electric motor and is designed, for instance, as an electric screwdriver. Interface 12 can be inserted into it, allowing contact pin 2 to be screwed into load contact 3 particularly quickly and easily.

[0059] Fig. Figure 10 shows a charging system comprising a charging station 8, which serves to charge an electrically powered vehicle, also referred to as an electric vehicle 9. The charging station 8 includes a cable with a connector part 6 mounted on it, according to Fig. 1.

[0060] The electric vehicle 9 has a mating connector part 7 in the form of a charging socket. The connector part 6 can be plugged into the mating connector part 7 to establish a plug connection. In doing so, the load contacts 3 of the connector part 6 are electrically connected to corresponding load contacts of the mating connector part 7. The charging station 8 is designed to provide a charging current in the form of alternating current or direct current and thus charge a rechargeable battery of the electric vehicle 9 via the connector part 6.

[0061] Based on Fig. Section 11 now describes a method for mounting a contact pin 2 on an electrical load contact 3 to produce a load contact arrangement 5, in particular the load contact arrangement 5 described above.

[0062] The procedure includes the following steps.

[0063] Step S1: Inserting the cylindrical section 200 of the contact pin 2 into the receptacle 100 of the holder 10 of the screw tool 1. The contact pin 2 has the same diameter throughout its cylindrical section 200. During the manufacturing of the contact pin 2, the cylindrical section 200 is not machined, for example. Thus, the diameter of the cylindrical section 200 can correspond to the diameter of the blank.

[0064] Step S2: Rotating the screw tool 1 relative to the load contact 3 by applying a torque to the interface 12 (e.g. clockwise) so that the at least one one-sided locked freewheel 11 locks the inserted contact pin 2 relative to the screw tool 1 and the contact pin 2 is screwed to the load contact 3.

[0065] Step S3: Remove the screw tool 1 from the contact pin 2, in particular by turning it in the opposite direction to before (e.g. counterclockwise) to loosen the freewheels 11 and pull it off the contact pin 2.

[0066] To carry out a process for manufacturing a connector part 6, steps S1 to S3 are performed once or several times to produce a predetermined number (e.g., two) load contact arrangements 5. Then, in step S4, the one or more load contact arrangements 5 are mounted on the housing of the connector part 6 to manufacture the connector part 6. Reference symbol list 1 screwdriver 10 holders 100 recordings 11 Free run 110 recording 111 Cage 112 clamping element 113 Housings 114 spring 12 Interface 2 contact pins 20 pen bodies 200 cylindrical section 201 threads 202 End 203 surface 21 Insulating cap 3 load contacts 30 recordings 300 floor 31 threads 32 contact arm 33 O-ring 34 In-depth study 35 base 36 groove 4 sets 5 Load contact arrangement 6 connector part 60 plug-in section 61 Contact 62 handle 7 mating connector part 8 charging stations 9 Electric vehicle Axis W tool QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] US 5,588,852 A

[0003] DE 10 2020 112 117 A1

[0004] DE 197 26 517 A1

[0005]

Claims

Load contact arrangement (5) for a connector part (6), comprising: - a contact pin (2) with a pin body (20) having a cylindrical section (200) extending along an axis (A) and an adjoining thread (201), and - a load contact (3) for establishing an electrical connection, with a receptacle (30) and a thread (31) accessible via the receptacle (30), wherein the thread (201) of the pin body (20) is screwed to the thread (31) of the load contact (3) and the surface (203) of the pin body (20) extends from the cylindrical section (200) to an end (202) of the pin body (20) facing away from the thread (201) in accordance with a surface of revolution around the axis (A). Load contact arrangement (5) according to claim 1 , characterized in that an electrically insulating insulating cap (21) is mounted at the end (202) of the pin body (20) facing away from the thread (201) of the pin body (20). Load contact arrangement (5) according to claim 1 or 2, characterized in that the load contact (3) has several contact arms (32) arranged concentrically around the axis (A) which project from a base (300) in which a recess (34) is formed in which the thread (31) of the load contact (3) is provided. Load contact arrangement (5) according to one of the preceding claims, characterized in that the pin body (20) of the contact pin (2) is formed in one piece. Load contact arrangement (5) according to one of the preceding claims, characterized in that the pin body (20) of the contact pin (2) is electrically conductive. Load contact arrangement (5) according to one of the preceding claims, characterized in that the thread (201) of the pin body (20) is designed as an external thread. Connector part (6) for electrical contacting a mating connector part (7), characterized by several load contact arrangements (5), each according to one of the preceding claims. Screwing tool (1) for screwing a contact pin (2) to an electrical load contact (3) for producing a load contact arrangement (5) according to one of claims 1 to 6, comprising: - a holder (10) with a receptacle (100), - at least one freewheel (11) fixedly inserted in the receptacle (100), wherein the at least one freewheel (11) has a receptacle (110) into which a cylindrical section (200) of the contact pin (2) can be inserted, such that rotation of the holder (10) in one direction of rotation about the axis (A) relative to the inserted contact pin (2) is released by the at least one freewheel (11) and rotation in the other direction of rotation about the axis (A) relative to the inserted contact pin (2) is blocked by the at least one freewheel (11), and - an interface (12) fixedly connected to the holder (10) for transmitting a torque about the axis (A) to the holder (10). Screw tool (1) according to claim 8, characterized in that the at least one freewheel (11) is firmly connected to the holder (10) by a press fit. Screw tool (1) according to claim 8 or 9, characterized in that the at least one freewheel (11) has a cage (111) in which several clamping elements (112) are held in such a way that they are movable relative to the cage (111) between a clamping position in which they are each clamped between the cage (111) and the inserted contact pin (2), and a release position in which they are movable relative to the contact pin (2). Screwing tool (1) according to claim 10, characterized in that the clamping elements (112) are each designed in the form of a roller. Screwing tool (1) according to claim 10 or 11, characterized in that the clamping elements (112) are each spring-elastically pre-tensioned into the clamping position. Screwing tool (1) according to one of claims 8 to 12, characterized in that two or more freewheels (11) are arranged axially one behind the other in the receptacle (100) of the holder (10). Screwing tool (1) according to one of claims 8 to 13, characterized in that the interface (12) is polygonal, in particular in the form of a hexagonal drive. Set (4) comprising:- a screw tool (1) according to one of claims 8 to 14 and- the contact pin (2) having a thread (201). Set (4) according to claim 15, further comprising the load contact (3) having a thread (31) with which the thread (201) of the contact pin (2) can be screwed to form a load contact arrangement (5) according to any one of claims 1 to 6. Method for mounting a contact pin (2) on an electrical load contact (3) to produce a load contact arrangement (5), in particular according to one of claims 1 to 6, the method comprising: - Inserting (S1) a cylindrical section (200) of the contact pin (2) into the receptacle (100) of the holder (10) of the screw tool (1) according to one of claims 8 to 14; - Rotating (S2) the screw tool (1) relative to the load contact (3) by applying a torque to the interface (12), such that the at least one freewheel (11) locks the inserted contact pin (2) relative to the screw tool (1) and the contact pin (2) is screwed to the load contact (3); and - Removing (S3) the screw tool (1) from the contact pin (2).

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