Spring-cage terminal and conductor connection terminal

Abstract

Spring-loaded terminal connection for connecting an electrical conductor (9) by means of spring force, wherein the spring-loaded terminal connection has at least one busbar (3) and a clamping spring (4) having a clamping leg (43) with a clamping edge (46) for clamping an electrical conductor (9) to a contact section (31) of the busbar (3), wherein the clamping spring (4) has a support section (41) and a spring arch (42) that connects the support section (41) to the clamping leg (43), and having a holding element (5) that is designed to hold the clamping leg (43) in an open position, wherein the spring-loaded terminal connection has at least one first actuating element (7) for transferring the clamping leg (43) into the open position by manually actuating the first actuating element (7), characterized inthat the spring arch (42) provides a virtual axis of rotation of the clamping leg (43) during its pivoting movement into the open position, wherein the virtual axis of rotation lies in the region of the spring arch (42) and is arranged closer to the transition of the spring arch (42) to the support section (41) than to the transition of the spring arch (42) to the clamping leg (43).

Description

The invention relates to a spring force clamping connection for connecting an electrical conductor by means of spring force, wherein the spring force clamping connection has at least one busbar and a clamping spring which has a clamping limb with a clamping edge for clamping an electrical conductor to a contact section of the busbar, wherein the clamping spring has a support section and a spring bow which connects the support section to the clamping limb, and having a retaining element which is configured to retain the clamping limb in an open position, wherein the spring force clamping connection has at least one first actuating element for transferring the clamping limb into the open position by manually acting on the first actuating element. The invention also relates to a conductor connection terminal with such a spring force clamping connection.Such a conductor connection terminal is known from DE 10 2020 119 372 A1. This is a conductor connection terminal with automatic connection of the electrical conductor to be connected when the latter is inserted into the conductor connection terminal. By inserting the electrical conductor, the clamping leg of the clamping spring held in an open position is automatically released and thereby effects a clamping of the electrical conductor.Proceeding from this, it is an object of the present invention to specify a further improved spring force terminal connection and a conductor terminal connection.This object is achieved in that the spring bow provides a virtual axis of rotation of the clamping leg during its pivoting movement into the open position, wherein the virtual axis of rotation lies in the region of the spring bow and is arranged closer to the transition of the spring bow to the support section than to the transition of the spring bow to the clamping leg.The clamping leg can form together with the contact section of the busbar a clamping point for clamping an electrical conductor between the clamping leg and the contact section. In the open position, at least the clamping edge of the clamping leg is pivoted away from the contact section of the busbar. The clamping leg can be pivoted, for example, between an open position, in which the electrical conductor is freely movable between the clamping leg and the contact section, and a clamping position, in which the clamping leg clamps the electrical conductor to the contact section.As mentioned, the clamping spring has a support section which is connected to the clamping leg via the spring bend. The mounting section serves for mounting the clamping spring on the busbar or another component of a conductor connection terminal. The support section allows a secure support of the clamping spring and a sufficient support against the spring force exerted by the clamping leg.The spring curve of a clamping spring of such a spring force clamping connection usually has the function of executing the essential part of the bending movement when the clamping leg is transferred from the clamping position into the open position by the first actuating element or springs back from the open position into the clamping position again. In many cases, the spring bow bends relatively uniformly over the bow length. In contrast to this, it is now proposed that a virtual axis of rotation of the clamping leg is provided for this pivoting movement by the spring bow. This virtual axis of rotation is located in the region of the spring bow, namely not centrally on the spring bow, but rather closer to the transition of the spring bow to the support section than to the transition of the spring bow to the clamping leg. A clamping spring configured in this way opens up the possibility of actuation by actuating mechanisms configured differently from those customary in the prior art. In particular, an actuation by means of an actuation presser as the first actuation element is possible, wherein the actuation presser lies above the spring root, or in other words is arranged and / or aligned substantially centrally with respect to the spring arch.According to an advantageous embodiment of the invention, it is provided that the virtual axis of rotation is arranged in the region of 20% of the total arc length, as viewed over the arc length of the spring bow starting from the support section. The virtual axis of rotation can thus be arranged relatively close to the transition point of the spring arch / support section, e.g. directly at this transition point or e.g. at most 20% of the total arch length of the spring arch removed therefrom, or at most 10% of the total arch length of the spring arch removed therefrom.According to an advantageous embodiment of the invention, it is provided that the first actuating element has a loading section, via which the first actuating element can be manually loaded with an actuating force, wherein the loading section is arranged substantially centrally with respect to the spring arch. The actuating force introduced via the loading section is thus introduced at a location which lies above the spring arch, i.e. on the concave outer side of the spring arch. In this way, the spring force clamping connection and a conductor connection terminal formed therewith can be designed to be relatively small, since a conductor insertion channel for inserting the electrical conductor can be arranged relatively close to the clamping limb.According to an advantageous embodiment of the invention, it is provided that the spring bow has at least one material weakening which is punctiform and / or continuous over the bow length of the spring bow and by means of which the virtual axis of rotation is formed. This makes it possible to form the desired virtual axis of rotation in a simple and cost-effective manner and to place it at a particularly suitable location. The material weakening of the spring bow can be a reduction in the width of the spring bow and / or a reduction in the material thickness of the spring bow, e.g. by producing an impression in the material of the spring bow and / or removing material from the spring bow, e.g. in the punching-bending process of the clamping spring or by a subsequent processing step. A region of the spring curve is considered as material weakening, at which the spring curve has a reduced stiffness in relation to adjacent regions of the spring curve, for example a region in which the cross-sectional area of the spring curve is less than the maximum cross-sectional area occurring at the spring curve.According to an advantageous embodiment of the invention, it is provided that the clamping spring has a waist in the region of the spring arch. With such a narrowing of the cross section of the spring arch, the virtual axis of rotation can be specifically displaced and defined in the direction of the support section. In this case, a narrowing is understood to mean a reduction in the width of the spring bow at least in a section of the bow length of the spring bow.The waisting can be symmetrical or asymmetrical, in particular in such a way that the waisting is formed only on one edge of the spring arch or the one edge has a different waisting than the other edge.According to an advantageous embodiment of the invention, it is provided that the waist is formed symmetrically on both marginal edges of the spring bow. In this way, the occurring stresses in the material of the spring arch can be distributed uniformly, so that tension elevations are avoided. The clamping spring is then particularly suitable for central actuation in the width direction by the first actuating element.According to an advantageous embodiment of the invention, it is provided that the width of the spring bow is continuously reduced from the clamping leg to the support section. In this way, the waisting can be realized particularly favorably. Sudden changes in the width of the spring bow are avoided, so that no mechanical tension elevations occur on the spring bow.According to an advantageous embodiment of the invention, it is provided that the width of the spring bow at the transition of the spring bow to the support section is less than the width of the support section. This also allows the position of the virtual axis of rotation to be placed in a targeted manner at a desired location in the region of the spring arch close to the support section.According to an advantageous embodiment of the invention, it is provided that an actuating tab protrudes from the clamping leg in the direction of the first actuating element, wherein the actuating tab is configured to transmit a manual actuating force exerted on the first actuating element to the clamping leg. As a result, a spring force clamping connection of relatively short construction transversely to the conductor insertion direction can be realized, which can be actuated effectively and ergonomically by such an actuation mechanism comprising the first actuation element and the actuation tab. In this way, a conductor terminal with automatic connection of the electric conductor to be connected can be improved with good operability and reliability in terms of the size.The spring force clamping connection can have an actuating mechanism for transferring the clamping limb into the open position, which actuating mechanism has at least two separate components in the form of the first actuating element and a second actuating element, for example the actuating tab, wherein the second actuating element is configured to transmit a manual actuating force exerted on the first actuating element to the clamping limb.By means of the actuating mechanism, the clamping leg can be transferred into the open position upon manual actuation counter to the spring force of the clamping spring. In this open position, the clamping leg can then be held by the holding element, in particular even without further manual actuation of the actuating mechanism, so that an insertion of the electrical conductor is possible at any time without any special exertion of force.The holding element can act directly on the clamping leg, for example, in order to hold it in the open position. Thus, for example, a first latching element can be arranged on the clamping limb and a second latching element can be arranged on the holding element, wherein the first and the second latching element can be latched to one another in the open position. The holding element can be designed as a protruding latching arm. The first latching element can be designed as a latching projection or latching hook. The second latching element can be designed as a latching edge or latching opening.The holding element can be present as a separate component, which is fastened, for example, to an insulating material housing of a conductor connection terminal, to the busbar or to another component.According to an advantageous embodiment of the invention, it is provided that the holding element is formed in one piece from the material of the clamping spring. This has the advantage that the holding element can be produced directly during the shape bending process of the clamping spring. A separate mounting of the holding element is thus superfluous.According to an advantageous embodiment of the invention, it is provided that the clamping spring has a spring bow adjoining the clamping leg, wherein the actuating tab protrudes beyond the spring bow in a direction pointing away from the clamping edge. This is also conducive to a slender design of the spring force clamping connection. The actuation tab may extend, for example, from a coupling location at which the actuation tab is coupled to the clamping leg, along the clamping leg to the spring arch and beyond.The first actuating element can be designed, for example, as a displaceable pusher or pivotable lever. In the case of a pusher, the latter can be arranged so as to be substantially linearly displaceable in a receiving channel of an insulating material housing. The actuating tab can be realized in a wide variety of ways, wherein a wide range of possible materials can also be used, in particular also electrically conductive materials such as metal.According to an advantageous embodiment of the invention, it is provided that the first actuating element and the actuating tab are positively coupled to the clamping spring. The actuating tab can be positively coupled in particular to the clamping limb. In this way, the actuating mechanism necessarily carries with it certain movements of the clamping spring or of the clamping limb. As a result of the positive coupling, the first actuating element and the actuating tab are each in different positions depending on whether the clamping limb is in the open position or in the clamping position. In particular, it is thereby possible in a simple manner for the user to distinguish whether the clamping spring is in the clamping position or the open position, which can be detected, for example, on the basis of different positions of the first actuating element relative to the insulating material housing. For example, a first actuating element designed as an actuating presser can be arranged lower in a receiving channel of the insulating material housing in the open position than in the clamping position.According to an advantageous embodiment of the invention, it is provided that the actuating tab is coupled to the clamping leg at a fixed coupling point. In this way, for example, the positive coupling of the actuating tab with the clamping spring can be realized.According to an advantageous embodiment of the invention, it is provided that the actuating mechanism of the spring force clamping connection has at least one second actuating element which is designed as a component separate from the clamping spring and has the actuating tab. In this way, the actuating tab can be designed in a wide variety of embodiments and sizes, since material of the clamping spring does not have to be used for this purpose. In particular, this prevents weakening of the clamping spring.According to an advantageous embodiment of the invention, it is provided that the second actuating element has a stiffening bead running in the longitudinal direction, which extends from a fastening section of the second actuating element, which is configured for fastening the second actuating element to the clamping limb, into the actuating tab. The stiffening bead increases the moment of area inertia of the second actuating element and thus increases its stiffness. This has the advantage that no separate guide channel is required in the insulating material housing for guiding the actuating tab. The stiffening bead can be embossed into the material of the second actuating element.According to an advantageous embodiment of the invention, it is provided that the second actuating element has at least one second form-fit element, with which the second actuating element can be coupled in a form-fit manner to at least one first form-fit element, which is formed on the clamping limb as a counterpart to the second form-fit element. By connecting the first form-fitting element to the second form-fitting element, a form-fitting coupling of the second actuating element and thus of the actuating tab to the clamping limb can be realized at the fixed coupling point. For example, the first form-fitting element can be designed as a protruding pin and the second form-fitting element as a pin receptacle for receiving the pin. The assignment can, however, also be carried out in the opposite direction. The second actuating element can be coupled to the clamping limb in an articulated manner, for example, at the fixed coupling point, such that it can be pivoted with respect to the clamping limb at least to a certain extent via this articulated coupling. The second actuating element can also be rigidly coupled to the clamping limb in an articulated manner at the fixed coupling point.According to an advantageous embodiment of the invention, it is provided that the first actuating element is formed from an insulating material and the second actuating element is formed from a metal material. The insulation required for electrical components is thus provided by the first actuating element. The second actuating element can then be manufactured in a space-saving manner from relatively thin metal material.According to an advantageous embodiment of the invention, it is provided that the first actuating element is fixed on the actuating tab. In this way, the first actuating element is held by the actuating tab and cannot be lost. The first actuating element can be coupled to the actuating tab, for example, by a cohesive connection, a force-fit connection and / or a form-fit connection.According to an advantageous embodiment of the invention, it is provided that the spring force clamping connection has a release element with a release section, by means of which the clamping leg held on the holding element in the open position can be released from the holding element when an electrical conductor to be clamped exerts an actuating force on the release section. This allows the clamping leg to be automatically released from the holding element by the insertion of the electrical conductor. The release section can be acted upon by a separate tool, a component of the conductor connection terminal, such as an actuating element, or directly via the inserted electrical conductor itself with compressive force and thereby bring about the release of the clamping leg from the holding element. By means of the release element, the clamping leg held on the holding element in the open position can be released from the holding element by the application of pressure to the release section in the conductor insertion direction of the electrical conductor to be connected. Depending on the design of the spring force clamping connection, the release element can be designed as part of the clamping spring, for example as a release element formed integrally with the clamping spring, or as a separate component.According to an advantageous embodiment of the invention, it is provided that the holding element is arranged on the support section, on the release element or on a section of the clamping spring connecting the release section to the support section. The holding element can be formed in particular integrally with the support section, the release element or a section of the clamping spring connected to the support section. In this way, no additional separate component needs to be provided. The manufacturing and assembly effort of the spring force clamping connection can thereby be reduced.According to an advantageous embodiment of the invention, it is provided that the busbar has a slot-shaped opening through which the clamping spring or at least its clamping limb projects. This is conducive to secure clamping of an electrical conductor to the busbar. For example, the contact section can be formed as a contact tongue cut free from the material of the busbar and bent, e.g. a contact tongue bent away from the surface of the busbar, on which contact tongue the support section is supported on the busbar. The electrical conductor to be clamped can then likewise be guided through the slot-shaped opening, so that it is securely held therein. The slot-shaped opening can be surrounded on the circumference completely or predominantly by the material of the busbar.According to an advantageous embodiment of the invention, it is provided that the clamping spring is supported with its support section on the busbar, in particular on an inner side of the slot-shaped opening. This allows a secure mounting of the clamping spring with support on both sides, so that the forces of the clamping spring are kept away from the insulating material housing of a conductor connection terminal. For example, both the support section and the clamping leg can project through the slot-shaped opening.The object mentioned at the outset is also achieved by a conductor connection terminal having an insulating material housing which has at least one conductor insertion opening for receiving an electrical conductor in a conductor insertion direction, wherein at least one spring force clamping terminal of the type explained above is arranged in the insulating material housing. The advantages explained above can also be realized in this way. The electric conductor can be inserted through the conductor insertion opening in the conductor insertion direction up to the clamping point between the clamping edge of the clamping leg and the contact portion of the busbar and clamped there.According to an advantageous embodiment of the invention, a conductor guide channel for guiding the electrical conductor to be clamped to the contact section can be formed in the insulating material housing, wherein the release section of the release element is arranged in the conductor guide channel or at least protrudes into the conductor guide channel.According to an advantageous embodiment of the invention, the release section of the release element can be arranged behind the contact section or at least behind the clamping point in the conductor insertion direction.According to an advantageous embodiment of the invention, it is provided that the insulating material housing has a receiving channel for receiving and mounting the first actuating element. The first actuating element can be designed as an actuating element that can be displaced in the receiving channel. In this way, the first actuating element can be reliably guided through the material of the insulating material housing. Jamming and tilting during actuation is avoided.The receiving channel can be arranged in the direction of displacement of the first actuating element in the receiving channel substantially flush with the spring arc of the clamping spring. In this way, the first actuating element can be arranged so to speak above the spring bow and does not have to be arranged above the clamping leg, as in known conductor connection terminals. In this way, the conductor insertion channel can be arranged relatively close to the clamping leg.According to an advantageous embodiment of the invention, the first actuating element has a cavity which is open toward the actuating tab and into which the actuating tab dips with a free end. As a result, the actuating tab can be securely guided during the actuating operation and partially accommodated.According to an advantageous embodiment of the invention, the cavity is delimited by a guide wall which is configured for bearing and guiding the free end of the actuating tab, wherein the guide wall runs obliquely with respect to the actuating direction of the first actuating element. This is also conducive to an actuation of the clamping leg with a low actuation force.In the sense of the present invention, the indefinite term "a" is not to be understood as a numerical word. Thus, if, for example, a component is mentioned, this is to be interpreted in the sense of "at least one component". Insofar as angle specifications are given in degrees, these refer to a circular dimension of 360 degrees (360°).The invention is explained in more detail below on the basis of exemplary embodiments using drawings.They show FIG. 1 shows a clamping spring in the relaxed state in a perspective view, FIG. 2 shows the clamping spring according to FIG. 1 in the open position, FIG. 3 shows the clamping spring according to FIG. 1 with a second actuating element in a perspective view, FIG. 4 shows a spring force clamping connection in a perspective view, FIG. 5 shows a conductor connection terminal in a lateral sectional view in the clamping position, FIG. 6 shows the conductor connection terminal according to FIG. 5 in the open position, FIG. 7 shows the clamping spring according to FIG. 1 in a plan view of the mounting section, FIG. 8 shows the clamping spring according to FIG. 1 in a plan view of the clamping limb, FIG. 9 shows the clamping spring according to FIG. 1 with the second actuating element in a side view.The clamping spring 4 that can be seen in FIGS. 1 and 2 has a clamping leg 43, a spring arch 42 adjoining the clamping leg 43, and a support section 41 adjoining the spring arch 42. Furthermore, a holding element 5 is present, which is formed integrally with the clamping spring 4, in particular with a region 40 of the support section 41, which has a reduced width than the region of the support section 41 adjoining the spring arch 42. The holding element 5 serves to hold the clamping leg 43 in the open position, as can be seen in FIG. 2.Furthermore, a release element 8 is present, which is likewise formed integrally with the clamping spring 4, for example as a material section which adjoins the holding element 5. The release element 8 has a release section 80 at its free end, by means of which the clamping leg 43 held on the holding element 5 in the open position can be released from the holding element 5 when an electrical conductor to be clamped exerts an actuating force on the release section 80.Towards the free end, a clamping tongue 45 is bent at the clamping leg 43. The clamping tongue 45 terminates at its free end with a clamping edge 46 which serves for clamping the electrical conductor. The clamping tongue 45 is thus part of the clamping leg 43. the clamping tongue 45 can be extended from the material of the clamping leg 43 and bent in a direction facing away from the support section 41. By the extension of the clamping tongue 45, first latching elements 47, for example in the form of protruding latching arms, remain on both sides of the clamping tongue 45. The first latching elements 47 are configured for latching coupling with second latching elements 50 of the retaining element 5. The latching takes place in the open position, as can be seen in FIG. 2.Furthermore, first form-fitting elements 44 are integrally formed on the clamping limb 43, for example in the form of laterally projecting projections, lateral notches and / or other recesses. The first form-fitting elements 44 serve for attaching a second actuating element 11, as described below with reference to FIGS. 3 and 4.The second actuating element 11 that can be seen on the left in FIG. 3 has an actuating tab 6. Furthermore, the second actuating element 11 has a connecting section 62, which connects the actuating tab 6 to second form-fit elements 63 of the second actuating element 11. The second form-fitting elements 63 serve for the form-fitting fastening of the second actuating element 11 to the first form-fitting elements 44 of the clamping spring 4 which are embodied for this purpose as counterparts. Due to the positive coupling of the second actuating element 11 at a fixed point on the clamping leg 43, the second actuating element 11 is positively coupled to the clamping spring 4 and thus also performs its movements. The second form-fitting elements 63 protrude from the connecting portion 62, which, in the state in which they are mounted on the clamping spring 4, as FIG. 3 shows on the right-hand part, can extend laterally along at least part of the spring arch 42 and of the clamping limb 43. In this embodiment, the connecting section 62 is located above the spring bend 42 as viewed from the clamping leg 43.The actuating tab 6 is connected to the clamping leg 43 in this way and extends from the clamping leg 43 in a direction pointing away from the clamping leg 43 as far as beyond the spring bow 42. The actuating tab 6 can extend diametrically away from the clamping leg 43, i.e. form a straight line with the clamping leg 43, or be set slightly obliquely to the clamping leg 43 over a curved region. The actuating tab 6 ends at the free end with a coupling section 60 which is designed for coupling the actuating tab 6 to a first actuating element.FIG. 4 shows the arrangement of the clamping spring 4 and the second actuating element 11 explained with reference to FIG. 3 after mounting on a busbar 3.The bus bar 3 may have an angled shape with a main portion 30 in which a slot-shaped opening 32 is formed. A contact portion 31 of the busbar 3 can be extended from the main portion 30 and bent, for example bent in the direction of the release portion 80. The clamping spring 4 is supported with its support section 41 on the one hand on the surface of the main section 30 facing away from the contact section 31 and in addition is supported with a rear side of the region 40 on the inner side of the slot-shaped opening 32. As can be seen, both the narrower region 40 of the support section 41 and the clamping leg 43 project through the slot-shaped opening 32.FIG. 5 shows a conductor connection terminal 1 with an insulating material housing 2, in which a spring force terminal connection according to FIG. 4 is arranged. The insulating housing 2 has a conductor insertion opening 20, into which an electrical conductor can be inserted in a conductor insertion direction L and clamped at a clamping point formed between the clamping leg 43 or the clamping edge 46 and the contact section 31. The insulating housing 2 further has a receiving channel 21, in which the first actuating element 7 is guided in a displacement direction during manual actuation. The first actuating element 7 is designed as an actuating presser. The first operating member 7 has an operating surface 70 to which the manual operating force can be applied by the user.It can also be seen that the first actuating element 7 has a cavity 71 for receiving the coupling section 60 of the actuating tab 6. In the course of the actuation of the first actuating element 7, the coupling section 60 slides along an inner wall 72 delimiting the cavity 71. This inner wall 72 can form a wedge shape relative to an outer wall of the first actuating element 7 facing the receiving channel 21, so that the actuating tab 6 is deflected to the side, i.e. in the direction of the conductor insertion opening 20, due to this wedge shape. This facilitates the transmission of the actuating force to the actuating tab 6.The inner wall 72 of the cavity 71 has two different slopes or slopes, so that depending on the actuation path of the first actuation element 7, a different force-path profile of the second actuation element (actuation tab) can be implemented.In FIG. 5, the clamping leg 43 is in its clamping position. If no electrical conductor is inserted, the clamping leg 43 can, for example, abut the contact section 31 or be at least in the immediate vicinity.FIG. 6 shows the conductor connection terminal 1 in the actuated state, in which the clamping limb 43 is transferred into the open position by manual actuation of the first actuating element 7. For this purpose, a manual actuating force can be exerted by the user on an actuating surface 70 of the first actuating element 7, as a result of which the first actuating element 7 is displaced downward in the receiving channel 21. As a result, the actuating tab 6 is pivoted to the right.In the open position, the first latching elements 47 latch with the second latching elements 50, so that the clamping leg 43 is held in the open position by the holding element 5, even if no further actuating force is exerted on the first actuating element 7. The first actuating element 7 now visually indicates to the user, by virtue of its position located further down in the receiving channel 21, that the conductor connection terminal 1 is located in the open position. In the open position, an electrical conductor 9 can be positioned at the clamping point without any force being applied.If the electrical conductor 9 is now to be clamped in the spring force clamping connection by means of spring force, only the electrical conductor 9 has to be pressed against the release section 80. As a result, the release section 80 is deflected somewhat downward, as a result of which the latching between the first latching elements 47 and the second latching elements 50 is canceled and the clamping limb 43 is thus released from the retaining element 5. Due to its spring force, the clamping leg 43 then springs with the clamping edge 46 against the electrical conductor 9 and clamps the latter firmly on the contact section 31.FIGS. 7 and 8 illustrate an advantageous configuration of the clamping spring 4 with a waisted spring bow 42. In this case, the width is symmetrically reduced on both sides, i.e. on both marginal edges of the spring bow 42. Over the arc length of the spring arc 42 the reduction of the width can take place uniformly or continuously, in particular linearly. This realizes a material weakening 48 on both sides on the spring bend 42.In the spring force clamping connection according to the invention, the clamping spring 4 has a virtual axis of rotation of the clamping leg 43, which lies in the region of the spring bend 42. As FIG. 9 illustrates, in the spring force clamping connection according to the invention, the virtual axis of rotation is displaced into the region A marked there, which is arranged relatively close to the transition of the spring bend 42 to the support section 41. The virtual axis of rotation can lie within the first 20% of the arc length B, in particular, as viewed over the arc length B of the spring arc starting from the support section 41.List of reference characters1 Conductor connection terminal 2 Insulating material housing 3 Busbar 4 Clamping spring 5 Holding element 6 Actuating tab 7 First actuating element 8 Releasing element 9 Electrical conductor 11 Second actuating element 20 Conductor insertion opening 21 Receiving channel 30 Main section 31 Contact section 32 Slot-shaped opening 40 Region of the mounting section 41 Mounting section 42 Spring bend 43 Clamping limb 44 First positive locking element 45 Clamping tongue 46 Clamping edge 47 First latching element 48 Material weakening 50 Second latching element 60 Coupling section 62 Connecting section 63 Second positive locking element 70 Actuating surface 71 Cavity 72 Inner wall 80 Releasing section B Arc length L Conductor insertion directionReferences included in the specificationThis list of documents cited by the applicant has been produced in an automated manner and is only included for the better information of the reader. The list is not part of the German patent application or utility model application. The DPMA does not take any adhesion for any faults or omissions.Patent Literature citedDE 10 2020 119 372 A1

[0002]

Claims

Spring force clamping connection for connecting an electrical conductor (9) by means of spring force, wherein the spring force clamping connection has at least one busbar (3) and a clamping spring (4) which has a clamping limb (43) with a clamping edge (46) for clamping an electrical conductor (9) to a contact section (31) of the busbar (3), wherein the clamping spring (4) has a mounting section (41) and a spring bow (42) which connects the mounting section (41) to the clamping limb (43), and having a holding element (5) which is configured to hold the clamping limb (43) in an open position, wherein the spring force clamping connection has at least one first actuating element (7) for transferring the clamping limb (43) into the open position by manually acting on the first actuating element (7), characterized in that, a virtual axis of rotation of the clamping leg (43) is provided by the spring bend (42) during its pivoting movement into the open position, wherein the virtual axis of rotation lies in the region of the spring bend (42) and is arranged closer to the transition of the spring bend (42) to the support section (41) than to the transition of the spring bend (42) to the clamping leg (43).Spring force clamping connection according to Claim 1, characterized in that the virtual axis of rotation is arranged over the arc length (B) of the spring arc (42), starting from the support section (41), in the region of 20% of the total arc length (B).Spring force clamping connection according to one of the preceding claims, characterized in that the first actuating element (7) has a loading section (70), via which the first actuating element (7) can be manually loaded with an actuating force, wherein the loading section (70) is arranged substantially centrally with respect to the spring bend (42).Spring force clamping connection according to one of the preceding claims, characterized in that the spring bend (42) has at least one material weakening (48) which is punctiform and / or continuous over the bend length (B) of the spring bend (42) and by means of which the virtual axis of rotation is formed.Spring force clamping connection according to one of the preceding claims, characterized in that the clamping spring (4) has a waist in the region of the spring bend (42).Spring force clamping connection according to Claim 5, characterized in that the waisting is formed symmetrically on both marginal edges of the spring bend (42).Spring force clamping connection according to one of the preceding claims, characterized in that the width of the spring bend (42) is continuously reduced from the clamping limb (43) to the support section (41).Spring force clamping connection according to one of the preceding claims, characterized in that the width of the spring bend (42) at the transition of the spring bend (42) to the support section (41) is less than the width of the support section (41).Spring force clamping connection according to one of the preceding claims, characterized in thatan actuating tab (6) projects from the clamping limb (43) in the direction of the first actuating element (7), wherein the actuating tab (6) is configured to transmit a manual actuating force exerted on the first actuating element (7) to the clamping limb (43).Spring force clamping connection according to Claim 9, characterized in that the clamping spring (4) has a spring bend (42) adjoining the clamping limb (43), wherein the actuating tab (6) projects beyond the spring bend (42) in a direction pointing away from the clamping edge (46).Spring force clamping connection according to one of Claims 9 to 10, characterized in that the first actuating element (7) has a cavity (71) which is open towards the actuating tab (6) and into which the actuating tab (6) dips with a free end.Spring force clamping connection according to one of the preceding claims, characterized in that the spring force clamping connection has a release element (8) with a release section (80), by means of which the clamping limb (43), which is held on the holding element (5) in the open position, can be released from the holding element (5) when an electrical conductor (9) to be clamped exerts an actuating force on the release section (80).Spring force clamping connection according to one of the preceding claims, characterized in that the holding element (5) is arranged on the support section (41), on the release element (8) or on a section of the clamping spring (4) connecting the release section (80) to the support section (41).Spring force clamping connection according to one of the preceding claims, characterized in that the busbar (3) has a slot-shaped opening (32) through which the clamping spring (4) or at least its clamping limb (43) projects.Conductor connection terminal (1) with an insulating material housing (2) which has an at least conductor insertion opening (20) for receiving an electrical conductor (9) in a conductor insertion direction (L), characterized in that at least one spring force clamping connection according to one of the preceding claims is arranged in the insulating material housing (2).

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