Electrical contact terminal and use of such

Abstract

Electrical contact terminal for detachable contacting of a contact partner having a flat section (50), with a pin-like, elongated internal assembly whose extension direction describes a longitudinal axis (16, 24) and an outer assembly (18, 22) which at least partially encloses the inner assembly (16, 24) and is axially movable to the inner assembly (16, 24), preferably bushing-like, wherein a contact means (38) for detachably contacting the contact partner (50) is assigned at the end of the inner (16, 24) and outer assembly (18, 22) in a mechanically and electrically conductive manner, wherein the contact means (38) forms a receiving area (10) enabling the insertion or insertion of a section of the contact partner (50) to be contacted before and / or during a contacting operating state of the electrical contact terminal (12), wherein the contact means (38) has a pair of contact arms (40, 42) which are resilient and / or pivotable transverse to the longitudinal axis and which interact with the inner (16, 24) and outer assembly (18, 22), that in a non-contact operating state corresponding to a first axial relative position between the inner (16, 24) and the outer assembly (18, 22), the receiving area (10) has a clear opening width transverse to the longitudinal axis and thus allows non-contact insertion or insertion of the contact partner (50) with respect to the contact arms (40, 42), in particular along the longitudinal axis, and in the contacting operating state of the contact arms (40, 42) corresponding to a second relative position shifted relative to the first axial relative position between the inner (16, 24) and the outer assembly (18, 22), the receiving area (10) is movable and / or guided in a contact-forming manner by action of the outer assembly (18, 22) against the section of the contact partner (50) in the receiving area (10), characterized in that that the contact means (38) for contacting a flat contact partner (50) on both sides is realized as a pair of opposing contact arms (40, 42) formed between them for clamping the receiving area (10) and that the pair of contact arms (40, 42) is realized as a one-piece assembly, in particular as a stamped and / or bent part and / or has a connecting section on one of the axially internal end regions facing the inner (16, 24) and outer assembly (18, 22), which is preferably designed for fixing to the inner assembly (16, 24).

Description

[0001] The present invention relates to an electrical contact clamp for detachably contacting a contact partner, in particular designed as a flat contact, according to the preamble of the main claim. Furthermore, the present invention relates to a use of such a contact clamp, and to a testing and contact system comprising such a contact clamp.

[0002] Electrical contact terminals suitable for flat contacts are generally known from the prior art. Due to their suitability for contacting contacts with currents in the multi-digit ampere range, known electrical contact terminals for flat contacts are also designed and used, particularly in the form of high-current terminals.

[0003] In contact terminals of this type, a flat contact, generally assumed to be the contact partner, is contacted by contact elements typically shaped like jaws. These contact elements are located at the ends of an arrangement consisting of an inner assembly, usually elongated and pin-like, which in turn is axially movably guided and mounted in an outer assembly – for example, for spring-like support. The inner and outer assemblies (suitably made of a metallic material) then facilitate the supply and removal of the contact element to and from the contact partner via the clamping jaws.

[0004] To ensure a reliable electrical contact (and typically releasable for a multitude of actuations) with consistent electrical contact quality, the design of the contact elements used is critical, both in terms of the choice of suitable material and the structural design. Particularly with regard to potential use as a high-current terminal, it is necessary, on the one hand, to apply sufficient contact force to the contact element (i.e., a jaw-like structure) with its contact section to the mating surface, so that no adverse contact resistances or other undesirable electrical effects arise. In this context, it is known to select spring materials which are then bent in a suitable manner – or in a U-shape – to contact the mating surface (e.g., a flat contact). Insertion or...Inserting the section of the contact partner to be contacted into the receiving area described by these contacting means then leads to a (springy) deflection, with the effect that contacting the contact partner can take place by spring force.

[0005] For suitable dimensioning, especially considering high contact currents, it is therefore necessary to maximize the contact pressure achievable by such a spring design. However, this is also disadvantageous in two ways: the more firmly the jaws of a jaw pair are pressed together by a correspondingly high spring force, the more force is required to insert the contact partner into such an arrangement. Furthermore, a high spring force during the insertion process causes the contact elements to slide along the (usually flat) surface of the contact partner until the complete insertion position is reached.A disadvantageous consequence of this is damaging abrasion and scratch marks on the contact surface of the mating device. This is particularly problematic in test systems designed with the standard electrical contact terminal for newly manufactured devices yet to be marketed. Conversely, optimizing the spring force or contact pressure to minimize abrasion and scratch damage could mitigate the problem of potentially defective electrical contacts, especially at high (test) currents. In practice, when contacting a high-current flat contact with a typical thickness of 0.8 mm and a width of 4 mm to 7 mm, this results in reproducibly achievable contact currents of approximately 3 A to 5 A.

[0006] As a further technology, generally assumed to be known from the prior art, the contact partner (typically designed as a flat contact) is contacted with non-spring-loaded contact elements. After the (flat) contact is inserted into the receiving area, it is secured (usually manually) by clamping screws or similar additional fastening means. While such clamping screws allow for sensitive and adjustable contacting of a flat contact – also minimizing detrimental grinding or scratching on the surface – this technology is nevertheless complex to handle. For example, the actuation of the additional fixing elements is generally only done manually, making it practically impossible to automate the establishment (and release) of contact with the contact partner, or only achievable with significantly increased equipment complexity.

[0007] From JP 2014-75 217 A a female socket is known which has contact means for contacting a male contact partner, comprising two contact arms which come into contact with the contact partner by means of a relative movement of an inner assembly relative to an outer assembly, with a curved section.

[0008] In JP S52-128 586 A, a method for inserting and removing a plug body from a socket body is described, wherein two spring-loaded contact arms are formed on an inner assembly, which come into contact with the plug body through a relative movement of the inner assembly with respect to an outer assembly.

[0009] JP S62-62774U describes a socket for a plug-in element, wherein the inner contact element is arranged on a spring which is tensioned when the plug-in element is inserted up to an inner assembly.

[0010] The object of the present invention is therefore to improve a known electrical contact clamp according to the preamble of the main claim both with regard to its electrical and mechanical contact properties, and to ensure that no adverse grinding or scratching occurs on a preferably used flat section of the contact partner when establishing and releasing the contact with the contact partner; at the same time, a high electrical contact quality should be achievable, which in particular allows the transmission of currents in the multi-digit ampere range.

[0011] Finally, the object of the present invention is to create an improved electrical contact clamp according to the preamble of the main claim, which is structurally simple to implement and enables the establishment and release of contact with the contact partner to be automated and, in particular, without the need for manual settings or adjustments for each individual case.

[0012] The problem is solved by the electrical contact terminal with the features of the main claim; advantageous embodiments of the invention are described in the dependent claims. Additional protection within the scope of the invention is claimed for the use of such a contact terminal according to the invention for the realization of an electrical testing device, wherein this use particularly provides for the transmission of contact currents above 10 A, more preferably above 30 A.

[0013] In an advantageous manner according to the invention, the electrical contact clamp of the present invention designs the relative movement between the inner and outer assembly along the axial direction with the first or second axial relative position defined thereby such that in the first axial relative position, when no contact is made, the receiving area determined by the contact means has a minimum clear width (transverse to the longitudinal axis) and thus allows the contactless insertion or insertion of the contact partner.

[0014] Because the contact means is realized with at least one pair of spring-loaded and / or pivotable contact arms, this first axial relative position also corresponds to a predetermined pivot position of the contact arms (namely enabling the clear opening width), which is pivotably held parallel or approximately parallel to the longitudinal axis.

[0015] In contrast, the present invention allows the contact arm to perform a (preferably spring-loaded) pivoting movement towards the central longitudinal axis when the inner and outer assemblies are moved into the second axial relative position; in other words, it moves to close the clear opening width. In this way, it is possible for the contact partner to be touched by the contact arms when the contact partner is inserted, and this movement is further advantageously effected or mechanically driven by the outer assembly (which performs the described relative movement).

[0016] This solution principle, embodied in the described mechanical functionalities, offers several advantages: Firstly, the clear opening width in the first axial relative position of the inner and outer assemblies allows the insertion of the contact partner (which is not itself part of the invention, but describes the functional suitability of the invention for contacting) without the contact arms potentially scratching or grinding on a flat section or similar surface of the contact partner during insertion or placement. In contrast, in the second axial relative position, the contact arms engage this flat section in a defined manner and with a predetermined force, in particular spring force, but only once the insertion is complete; in other words, no further scratching or scraping relative movement occurs. Accordingly, it is structurally possible to dimension a high contact force for this contact.

[0017] Compared to the state of the art that defines the category, such an improvement by a factor of 5 to 10 is achievable, i.e. currents up to 50A and more.

[0018] Furthermore, if, according to a preferred embodiment, the contact arrangement with the at least one pair of contact arms is fixed to the inner assembly (particularly axially on the inside), the insertion or insertion of a contact partner leads to relative movement between the first and second relative positions as soon as a leading edge of the contact partner engages a suitably provided section of the inner assembly and then moves it along to initiate the relative movement. Advantageously, according to the invention, the outer assembly, particularly and preferably at an opening-side section, i.e., in the region of an opening of the receiving area, then provides for the movement and guidance (i.e., pivoting) in the direction of the longitudinal axis to establish contact. In this way, an electrical contact terminal device that is mechanically simple to manufacture and simultaneously easy to automate in terms of contact movement can be realized.

[0019] In this context, it is provided, on the one hand, from manufacturing and dimensioning aspects, that the contact means with the contact arms is provided as a separate assembly from the inner and outer assemblies, for example with the purpose of specifying the further advantageous design as a stamped or bent part suitable for series production, appropriately dimensioned from a spring material and with the desired bending properties.

[0020] According to the invention, the contact means for contacting the flat contact partner on both sides is realized as a pair of opposing contact arms formed between them to span the receiving area. In this way, the contact means arrangement – ​​which according to the invention is to be provided as a separate assembly – is realized as a bracket consisting of a pair of contact arms, which are connected at one end by a bracket section that is, in turn, suitably attached or attachable to the inner assembly.

[0021] The contact arms, in any configuration, are advantageously jaw-shaped, leaf-like, or lamellar and further preferably have a deformed or profiled section intended for contacting the contact partner. In practical implementation, this deformed or profiled section can be realized as an angled section, such that an inwardly directed section (i.e., towards the central longitudinal axis) forms a kink edge, which, when in contact with the contact partner in the second relative position, ensures a defined electrical contact transition. It is advantageous not to form this edge, realized by angling or kinking, as an outer, end-faced edge at a (free) end of the arms, but rather to provide this edge a predetermined segment from this free end, so that the deformation or kink...Profiling technologies, in this case the preferred angling or bending, allow the contact pressure conditions to be designed in the best possible way: For example, a particularly preferred spring-like contact force is created by the fact that, during the relative movement of the inner assembly to the outer assembly, the contact arms slide along the outside of the end section of the outer assembly, whereby the angled, bent or profiled contour of the arms then causes the (inwardly clamping or spring-directed) arm movement through this sliding process.

[0022] According to a preferred embodiment of the invention, the inner assembly and the outer assembly are pre-tensioned against each other in the first relative position, namely by the advantageous action of the spring means to be provided between these assemblies, wherein, for example, in the case of axially guided assemblies, a compression spring acting in the transition area or on suitable abutments has proven to be particularly advantageous and preferred.

[0023] An embodiment not covered by the invention, particularly for advanced measurement tasks to implement the aforementioned four-pole measurement, may provide that the electrical contact terminal is designed to be electrically multipole, i.e., the contact arms are divided into multiple poles, or several contact arms, adjacent to or opposite each other, are arranged in multiples along a circumference and are each electrically contacted or contactable separately. In a simple two-pole embodiment, it is preferred for this purpose to electrically insulate the inner and outer assemblies from each other, thus creating a two-pole configuration. In an alternative embodiment, a hollow central area of ​​the inner assembly may be provided to accommodate a suitably multi-configured supply cable for the multipole contact element.

[0024] The present invention is particularly advantageous for flat contacts as contact partners, not least due to a preferred application context in the field of high-current contacting.

[0025] Not encompassed by the invention is the contacting of a contact partner with a complex, for example non-rectangular cross-section, including round cross-sections or contact partner cross-sections with radii or arcuate sections provided in sections along the circumference. In this embodiment not encompassed by the invention, it would then be advantageous to design the contact means, namely the respective contact arms, at least in the contact area with a corresponding rounded or arcuate shape, so that the best possible electrical contact can be achieved here as well.

[0026] Particularly when used in connection with test or contact systems that provide a plurality of electrical contact terminals of the type according to the invention, it is advantageous to assign fastening means to the arrangement of inner and outer components. These fastening means can be designed, for example, in a particularly advantageous manner as a support sleeve that at least partially encloses the inner and outer components and allows for mounting on suitable support systems or similar test devices. In an advantageous embodiment of such a support sleeve, it is then advantageous to design this support sleeve, particularly on its end face, i.e., opposite a receiving section with the inner / outer component arrangement, for contact with an electrical supply line. In this case, for example, with regard to a high-current context, an inner sleeve diameter can already accommodate a supply cable with a correspondingly large cross-sectional area.Not included in the invention is an arrangement of inner and outer components that can be detachably connected to further fastening means (such as the advantageous support sleeve) by means of lifting-rotating couplings, such as those that can be realized by a bayonet fitting; for this purpose, the inner or outer component can then be structurally designed to form a locking section at its end, e.g. by means of a pin inserted transversely to the longitudinal axis, which then engages in suitable slots or undercuts of the support sleeve and thus enables the detachable locking.

[0027] A further advantageous development is the provision of the carrier sleeve with suitable mounting or engagement sections for assembly tools; a collar section on the carrier sleeve designed with polygonal engagement surfaces for a wrench or the like is particularly beneficial, allowing it to be rotated appropriately in its operating position. For assembly, this variant offers the additional advantage that the contact element, which is advantageously designed according to the invention to be jaw-, leaf-, or lamellar-like, can be aligned with longitudinal or flat sections of such an assembly area, thus providing the assembler with visual orientation and handling assistance.

[0028] While the provision of the fastening means or the carrier sleeve and their design, as explained above, is a preferred further development of the present invention and particularly favors its use in connection with testing and contact systems.

[0029] The present invention, with its numerous embodiments, results in an electrical contact terminal that elegantly overcomes the optimization and dimensioning problems of generic contact terminals. It combines high contact quality and high contact force with the lowest possible risk of scratching and abrasion on a sensitive contact partner and is mechanically simple and designed for automated operation. Therefore, the present invention is particularly suitable for high-current applications above 10 A, preferably above 30 A, where flat contacts are preferred as the contact partner.

[0030] Further advantages, features and details of the invention will become apparent from the following description of preferred embodiments and from the drawings. Fig. 1 to Fig. 3 Different views of the electrical contact terminal according to a first preferred embodiment in a single-pole configuration as a partial longitudinal section view ( Fig. 1) and, in contrast, a partially longitudinally sectioned view rotated by 90° around the longitudinal axis ( Fig. 2), as a perspective view ( Fig. 3), wherein this first embodiment is in the Fig. 1 to 3 are shown in conjunction with a carrier sleeve; Fig. 4 and Fig. 5 Side views of the electrical contact terminal of the first embodiment, but with the carrier sleeve removed and in relative positions to a flat contact as the contact partner to be contacted, again in views rotated 90° to each other about the longitudinal axis; Fig. 6 and Fig. 7 views of the in the Fig. 1 to Fig. 3 assembled and Fig. 4, Fig. 5 disassembled support sleeve in perspective view ( Fig. 6) or longitudinal section view ( Fig. 7); Fig. 8 to Fig. 10 longitudinal section views of the intervention area of ​​the Fig. 1 in the first embodiment to illustrate an operational sequence when contacting a contact partner by successively introducing this contact partner into the opening area; Fig. 11 a side view analogous Fig. 5 of a second embodiment of the electrical contact terminal according to the invention, wherein the second embodiment enables two-pole contacting, and Fig. 12 a detailed view of the recording area of ​​the second embodiment ( Fig. 11) with a contact partner deployed in a contacting capacity, insofar as analogous to the drawing representation of the Fig. 10 of the first embodiment.

[0031] Based on the Fig. Sections 1 to 7 first explain the constructive realization of the electrical contact terminal of the first, single-pole embodiment. In this embodiment, "single-pole" means that a preferably flat contact partner, to be inserted into a receiving area 10 of the open, i.e., uncontacted, contact terminal 12, is contacted in a single pole, and the (single) potential of this contact partner is tapped by the electrical contact terminal and made available for further processing, in particular via a mounting section 14 for a cable provided at the other end of the receiving area 10 on the elongated contact terminal 12.

[0032] As illustrated in particular by the longitudinal sectional view of the electrical contact terminal of the first embodiment, a pin-like, elongated inner assembly 16 is enclosed by a sleeve-like outer assembly 18, which is held relatively movable along the axial longitudinal direction relative to the inner assembly 16. A spring element 20, designed as a compression spring, pre-tensions the assemblies 16 and 18 against each other, such that this compression spring is supported at one end by a base of an upper end section 22 of the outer assembly 18, and at the other end by a widened end section 24 of the inner assembly 16.

[0033] The arrangement consisting of outer assembly 18 and inner assembly 16 is held at one end in a support sleeve 26 ( Fig. 6, Fig. 7), which is intended for insertion or arrangement in / on test equipment in an otherwise known manner.

[0034] The carrier sleeve 26 (see again the partial sectional views of the Fig. 1, Fig. 2) is designed to releasably hold the arrangement of the assemblies 16, 18 by means of a plug / rotary lock in the manner of a bayonet coupling, such that a lower end of the pin (inner assembly 16), provided with a transverse pin 28 for locking, can engage in an internal groove 30 of the carrier sleeve 26 to allow axial movement, in order to then, in the Fig. 1, Fig. 2. To lock in the manner shown, after twisting according to the bayonet principle.

[0035] In the character plane of the Fig. At the upper end (1 to 7), i.e., in the direction of the receiving area 10, the carrier sleeve 26 is provided with knurling 32. Furthermore, the upper opening of the carrier sleeve 26 is enclosed by a collar 34, which forms a pair of opposing flats 36 for suitable actuation by impact wrenches. These flats are also designed, in particular by suitable alignment of the inner slot arrangement 30, such that they simultaneously enable orientation of the receiving area, which will be explained in detail below.

[0036] As in this regard, the sectional view of the Fig. Figure 1 illustrates that inside the open end section 22 of the outer assembly – which forms a pair of opposing, free arms – sits a spring-bar element as a contact means 38, which, made from a suitable springy steel material by stamping or bending, has a U-shaped cross-section ( Fig. 1) is mechanically and electrically contacted with a bottom-side connecting section of free contact arms 40, 42 via a connecting element 44 on the end section 24 of the inner assembly and projects out of the open end section of the outer assembly 22 in the area of ​​the outer ends of the contact arms 40, 42, wherein, as shown in the sectional view of the Fig. As can be seen in Figure 1, these free end sections of the contact arms 40, 42 are each bent outwards, forming a radially inwards directed bend edge 46. In the specific embodiment, the component 44 is made of a plastic material and is pressed into an end bore of the end section 24 such that, as intended, the contact means 38 electrically contacts the inner assembly 16 and is simultaneously mechanically held firmly on it.

[0037] Furthermore, how the Fig. 2 and Fig. As illustrated in Figure 3, in the area of ​​the engagement side (i.e., in the area of ​​the receiving area 10), the free contact arms 40, 42 of the contact means 38 are slotted or fanned in a transverse direction to provide a spring-loaded contact to a flat contact partner, here a tab 50 intended for high current ( Fig. 4, Fig. 5) to improve. It is also apparent that the free end sections of the contact arms 40, 42, which protrude from the end section of the outer assembly 22, rest against the outer end edges of the outer assembly 42, forming a respective inclined plane, so that a relative movement between the inner assembly 16 and the outer assembly 18 leads to the contact arms 40, 42 sliding along the open end section 22 and thus moving the radially inwardly directed bend edges 46, which define the clear receiving area 10, towards each other in order to establish contact.

[0038] This functionality will be further described with reference to the Fig. Explained in sections 8 to 10.

[0039] How the sequence of Fig. Figures 8 to 10 illustrate (perspective and representation analogous to the upper section of the Fig. 1) In a first free, open, and uncontacted state, the receiving area 10 is open; the radially inwardly directed bend edges 46 form a maximum distance from each other, which has a clear width greater than the thickness of the schematically shown contact partner 50. This allows the contact partner to be inserted into the opening or receiving area 10 without contacting the contact arms 40 or 42, with the advantageous effect of preventing any detrimental scraping, scratching, or the like on the potentially protected surface (flat side) of the contact partner 50.

[0040] In the continued introduction state of the Fig. Figure 9 shows that a front engagement edge 52 of the contact partner reaches and contacts the pin-shaped element 44, so that further insertion of the contact partner 50 then causes a subsequent immersion of the inner assembly 16 relative to the outer assembly 18, as shown in the Fig. Figure 10 shows that this relative movement (immersion) leads to the compression of the spring center 20 shown in comparison to the Fig. 9 and Fig. 10. At the same time, the relative movement between the inner and outer assemblies 16, 18 ensures that, as described above, the free end sections of the contact arms 40, 42 slide along or off the free end sections of the outer assembly 22, so that the inclined plane behavior generated by the outward bending of the lamellae leads to a closing of the contact means 38 around the contact partner 50, as shown in the Fig. Figure 10 illustrates the fully contacted state. In this operating state, the radially inwardly directed bend edges 46 are in contact and, due to the defined spring and pressure geometry (with defined contact force), are in contact with the contact partner 50, without any rubbing or similar relative movement of the contact partner having occurred up to that point. The advantageous effect is a defined, electrically robust contact suitable for high currents, in the illustrated embodiment up to 30 A and more, which effectively prevents any harmful scratching of the flat surface of the contact partner 50.

[0041] During the contact state of the Fig. 10. The relative movement between the inner and outer assembly has progressed to such an extent that the U-shaped stamping and bending element is practically completely contained in the open end area of ​​the outer assembly, thus the maximum contact force has been reached.

[0042] Subsequent release of the contact is achieved by releasing or separating contact partner 50 and contact terminal 12; by the force stored in the compressed spring element 20, the inner assembly 16 is again moved upwards relative to the outer assembly 18, taking the contact element 38 with it, which then extends and widens with its contact arms 40, 42 from the open end section 22, so that, forming a clear width between the radially inwardly directed bend edges 46, the receiving area is opened and the contact partner 50 can subsequently be removed freely, again without scratching or scraping.

[0043] In the exemplary embodiment shown, the maximum diameter of the carrier sleeve 26 is 5 mm, the effective length of the carrier sleeve 26 is approximately 50 mm, and the relaxed ( Fig. 1) With a total length of approximately 80 mm, the electrical contact terminal of the illustrated embodiment is suitable for transmitting contact currents in the double-digit ampere range, up to current strengths of 30 or even 50 amperes, and is thus many times greater than known solutions, with the additional advantage, as explained, of practically point- or line-shaped and therefore abrasion- and scratch-free contacting of the contact partner, with spring contact pressure defined by the spring and pressure geometry.

[0044] Based on the Fig. 11 and Fig. 12, otherwise structurally largely identical to the first embodiment described above. Fig. Figures 1 to 10 show a modification of this first embodiment such that, in addition to the described single-pole connection, a two-pole connection is also possible. This is particularly illustrated by the partial sectional view of the Fig. 12 (analogous to the representation of the Fig. 10 in the contact state), as the contact partner 50 is contacted in a two-pole manner, namely firstly by the contact medium 38, which is analogous to the Fig. 10 The flat sides of the contact partner 50 are contacted on both sides, and the electrical contact is conducted via the outer assembly 18 or its open end section 22. A second pole is reached for the contact partner tip by means of an internal pin 60, realized by a pin design of the inner assembly 16 that is modified in shape at its end. For electrical isolation from the outer assembly 18, a cylindrical insulator body 62 in the extended end section 22 separates the partners, and then, further along, a sheath insulation 64 insulates an elongated inner plunger section of the inner assembly 18 from a surrounding outer sleeve section of the outer assembly 18.

[0045] A separately contactable end section 66, brought out on the bottom side, establishes the electrical connection to the pin section 60 or the tip 52 of the contact partner 50, whereby the circuitry of the contact partner (also then appropriately internally insulated) can be carried out appropriately.

[0046] Also those based on the Fig. 11, Fig. The multi-pole configuration illustrated in 12 is not limited to the two mutually isolated conductor configurations; rather, multi-pole configurations can also arise here, for example, if an inner conductor (60 in Fig. 12) is implemented as a multi-pole wire, which can then contact a plurality of tab or lamellar sections of the contact arms 40, 42 (where the appropriate multi-pole insulation then takes place). A corresponding contact partner 50 can then be tapped and contacted in a suitable multi-pole manner.

Claims

[1] Electrical contact terminal for detachable contacting of a contact partner having a flat section (50), with a pin-like, elongated internal assembly whose extension direction describes a longitudinal axis (16, 24) and an outer assembly (18, 22) which at least partially encloses the inner assembly (16, 24) and is axially movable to the inner assembly (16, 24), preferably bushing-like, wherein a contact means (38) for detachably contacting the contact partner (50) is assigned at the end of the inner (16, 24) and outer assembly (18, 22) in a mechanically and electrically conductive manner, wherein the contact means (38) forms a receiving area (10) enabling the insertion or insertion of a section of the contact partner (50) to be contacted before and / or during a contacting operating state of the electrical contact terminal (12), wherein the contact means (38) has a pair of contact arms (40, 42) which are resilient and / or pivotable transverse to the longitudinal axis and which interact with the inner (16, 24) and outer assembly (18, 22), that in a non-contact operating state corresponding to a first axial relative position between the inner (16, 24) and the outer assembly (18, 22), the receiving area (10) has a clear opening width transverse to the longitudinal axis and thus allows non-contact insertion or insertion of the contact partner (50) with respect to the contact arms (40, 42), in particular along the longitudinal axis, and in the contacting operating state of the contact arms (40, 42), corresponding to a second relative position shifted relative to the first axial relative position between the inner (16, 24) and the outer assembly (18, 22), the contact arms (40, 42) can be moved and / or guided in a contact-forming manner by the action of the outer assembly (18, 22) against the section of the contact partner (50) in the receiving area (10). characterized by , that the contact means (38) for contacting a flat contact partner (50) on both sides is realized as a pair of opposing contact arms (40, 42) formed between them for clamping the receiving area (10) and that the pair of contact arms (40, 42) is realized as a one-piece assembly, in particular as a stamped and / or bent part and / or has a connecting section on one of the axially internal end regions facing the inner (16, 24) and outer assembly (18, 22), which is preferably designed for fixing to the inner assembly (16, 24). [2] Contact terminal according to claim 1, characterized by , that the contact arms (40, 42) are jaw-, leaf- or lamellar-shaped and / or designed to contact the contact partner (50) with a deformed section of the contact arms (40, 42). [3] Contact terminal according to claim 2, characterized by, that the deformed section of the contact arms (40, 42) can interact with an end section (22) of the outer assembly (18, 22) in such a way that an axial movement into the second relative position causes the contact arms (40, 42) to spring or pivot by sliding along the end section (22) and / or by carrying the contact arms (40, 42) along the end section (22) at its edge. [4] Contact terminal according to claim 2 or 3, characterized by , that the deformed section of the contact arms (40, 42) realizes a spreading and / or angling directed towards an end section (22) of the outer assembly (18, 22). [5] Contact terminal according to one of claims 2 to 4, characterized by , that the deformed section forms a radially inwardly directed kink edge (46) which is spaced apart from a free end of the contact arms (40, 42). [6] Contact terminal according to one of claims 1 to 5, characterized by, that the inner assembly (16, 24) is guided axially movable relative to the outer assembly (18, 22) in such a way that the insertion or insertion of the contact partner (50) into the receiving area (10) can trigger and / or cause the movement from the first to the second relative position. [7] Contact terminal according to one of claims 1 to 6, characterized by , that spring means (20), in particular a compression spring, are assigned to the inner assembly (16, 24) and the outer assembly (18, 22) such that the inner assembly (16, 24) and the outer assembly (18, 22) are pre-tensioned into the first relative position. [8] Contact terminal according to one of claims 1 to 7, characterized by , that the inner assembly (16, 24) and / or the outer assembly (18, 22) are detachably held at an end area opposite the contact means (38) at the other end in fastening means preferably designed as a support sleeve (26), which are preferably provided with an electrical supply line at the end. [9] Use of the electrical contact clamp according to any one of claims 1 to 8 for an electrical test device, in particular for contact currents to be tested greater than 10A, more preferably greater than 30A.

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