Spring force clamping connection piece and connection terminal

Abstract

The invention relates to a spring-force clamping connection for connecting electrical conductors by means of a spring force, the spring-force clamping connection having at least one busbar and a clamping spring, the clamping spring having a clamping leg, the clamping leg having a clamping edge for clamping an electrical conductor to a contact section of the busbar, wherein the clamping spring has a bearing section and a spring bow connecting the bearing section to the clamping leg, and the spring-loaded clamping connection has a retaining element which is configured to retain the clamping leg in the open position, and wherein the spring-loaded clamping connection has at least one first actuating element which is configured to actuate the clamping leg in the open position. The first actuating element is used for transferring the clamping leg into the open position by manual loading of the first actuating element. The invention further relates to a connection terminal having such a spring-loaded clamping connection.

Description

Technical Field

[0001] The present invention relates to a spring-force clamping connection for connecting an electrical conductor by means of spring force, wherein the spring-force clamping connection comprises at least one busbar and a clamping spring, wherein the clamping spring comprises a clamping leg with a clamping edge for clamping the electrical conductor to a contact section of the busbar, wherein the clamping spring comprises a support section and a spring bow connecting the support section to the clamping leg, and wherein the spring-force clamping connection comprises a retaining element configured to retain the clamping leg in an open position, wherein the spring-force clamping connection comprises at least one first actuating element for transferring the clamping leg into the open position by manually actuating the first actuating element. The present invention also relates to a connecting terminal having such a spring-force clamping connection. Background Art

[0002] Such a terminal is known from DE 10 2020 119 372 A1. This terminal automatically connects the electrical conductor to be clamped when the conductor is inserted into the terminal. Inserting the conductor automatically releases the clamping legs of the clamping spring, which are held in the open position, thereby clamping the conductor. Summary of the Invention

[0003] Proceeding from this, the object of the present invention is to provide a further improved spring force clamping connection and a connecting terminal.

[0004] This object is achieved in that a virtual axis of rotation of the clamping leg during its pivoting movement into the open position is provided by the spring bow, wherein the virtual axis of rotation is located in the region of the spring bow and is arranged closer to the transition from the spring bow to the support section than to the transition from the spring bow to the clamping leg.

[0005] The clamping legs can form a clamping point together with the contact section of the busbar for clamping the electrical conductor between the clamping legs and the contact section. In the open position, at least the clamping edge of the clamping legs is pivoted away from the contact section of the busbar. The clamping legs can be pivoted, for example, between an open position, in which the electrical conductor can move freely between the clamping legs and the contact section, and a clamped position, in which the clamping legs clamp the electrical conductor to the contact section.

[0006] As mentioned, the clamping spring has a support section that is connected to the clamping leg via a spring bow. The support section serves to support the clamping spring against a busbar or other component of the terminal block. The support section ensures reliable support of the clamping spring and adequate support against the spring force exerted by the clamping leg.

[0007] The spring bow of a clamping spring in such a spring-force clamping connection typically performs the main portion of the bending movement when the clamping leg is transferred from the clamped position to the open position or springs back from the open position to the clamped position by a first actuating element. In this case, the spring bow often bends relatively uniformly over its arc length. In contrast, it is now proposed that the spring bow provide a virtual axis of rotation for the clamping leg for the pivoting movement. This virtual axis of rotation is located in the region of the spring bow, specifically, not centrally on the spring bow, but closer to the transition from the spring bow to the support section than to the transition from the spring bow to the clamping leg. This design of the clamping spring opens up the possibility of actuation using an actuating mechanism that differs from the conventional actuating mechanisms of the prior art. In particular, actuation is possible using an actuating lever as the first actuating element, wherein the actuating lever is located above the spring root or, in other words, is arranged and / or oriented substantially centrally relative to the spring bow.

[0008] According to an advantageous embodiment of the invention, the virtual axis of rotation is arranged over the arc length of the spring bow, viewed starting from the support section, within a range of 20% of the total arc length. Thus, the virtual axis of rotation can be arranged relatively close to the spring bow / support section transition, for example directly at the transition or, for example, at a distance of at most 20% of the total arc length of the spring bow from the transition, or at a distance of at most 10% of the total arc length of the spring bow from the transition.

[0009] According to an advantageous embodiment of the present invention, the first actuating element has an actuating section via which an actuating force can be manually applied, wherein the actuating section is arranged substantially centrally relative to the spring bow. Consequently, the actuating force introduced via the actuating section is introduced at a location above the spring bow, that is, on the concave outer side of the spring bow. In this manner, the spring-force clamping connection and the resulting terminal can be designed to be relatively compact, since the conductor insertion channel for inserting the electrical conductor can be arranged relatively close to the clamping legs.

[0010] According to an advantageous embodiment of the present invention, the spring bow has at least one material weakening, either punctuated or continuous, along the length of the spring bow, which forms a virtual axis of rotation. This allows the desired virtual axis of rotation to be formed in a simple and cost-effective manner and positioned 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, for example by creating an indentation in the material of the spring bow and / or by removing material from the spring bow, for example during a stamping and bending process of the clamping spring, or by subsequent processing steps. A material weakening is considered to be a region of the spring bow where the spring bow has a lower stiffness than adjacent regions of the spring bow, for example, a region where the cross section of the spring bow is smaller than the maximum cross section occurring within the spring bow.

[0011] According to an advantageous embodiment of the present invention, the clamping spring has a constriction in the region of the spring bow. This constriction of the cross section of the spring bow allows the virtual axis of rotation to be shifted and defined in a targeted manner toward the bearing section. A constriction is understood to mean a reduction in the width of the spring bow at least over a portion of its arc length.

[0012] In particular, the constriction can be symmetrical or asymmetrical, so that the constriction is formed only at an edge edge of the spring bow, or one edge edge has a different constriction than another edge edge.

[0013] According to an advantageous embodiment of the present invention, the constrictions are symmetrically formed at both edge edges of the spring bow. This allows stresses occurring in the material of the spring bow to be evenly distributed, thus preventing excessive stresses. The clamping spring is then particularly suitable for being loaded centrally in the width direction by the first actuating element.

[0014] According to an advantageous embodiment of the invention, the width of the spring bow decreases continuously from the clamping leg to the support section. This allows for a particularly advantageous tapering. This prevents sudden changes in the width of the spring bow, preventing excessive mechanical stresses from occurring on the spring bow.

[0015] According to an advantageous embodiment of the invention, the width of the spring bow at the transition from the spring bow to the bearing section is smaller than the width of the bearing section. This allows the virtual axis of rotation to be positioned in a targeted manner at a desired location of the spring bow in the region near the bearing section.

[0016] According to an advantageous embodiment of the present invention, an actuating tab projects from the clamping leg toward the first actuating element, wherein the actuating tab is configured to transmit a manual actuating force applied to the first actuating element to the clamping leg. This allows for a spring-force clamping connection that is relatively short transversely to the conductor insertion direction and can be actuated efficiently and ergonomically via the actuating mechanism formed by the first actuating element and the actuating tab. In this manner, a connecting terminal with automatic connection of the electrical conductor to be clamped can be improved in terms of size while maintaining good operability and reliability.

[0017] The spring-force clamping connection can have an operating mechanism for transferring the clamping leg into the open position, which has at least two separate components in the form of a first operating element and a second operating element, for example an operating tab, wherein the second operating element is configured to transfer a manual operating force applied to the first operating element to the clamping leg.

[0018] The actuating mechanism allows the clamping leg to be moved into an open position during manual actuation, against the spring force of the clamping spring. In this open position, the clamping leg can then be held by the retaining element, in particular also without further manual actuation of the actuating mechanism, so that electrical lines can be inserted at any time without any particular expenditure of force.

[0019] The retaining element can, for example, act directly on the clamping leg to hold it in the open position. Thus, for example, a first latching element can be provided on the clamping leg and a second latching element can be provided on the retaining element, wherein the first latching element and the second latching element can lock together in the open position. The retaining element can be designed as a protruding latching arm. The first latching element can be designed as a latching projection or a latching hook. The second latching element can be designed as a latching edge or a latching opening.

[0020] The holding element can be present as a separate component which is fastened, for example, to an insulating material housing of a connecting terminal, to a busbar or to another component.

[0021] According to an advantageous embodiment of the present invention, the retaining element is formed integrally from the material of the clamping spring. This has the advantage that the retaining element can be produced directly during the bending process of the clamping spring, thereby eliminating the need for separate assembly of the retaining element.

[0022] According to an advantageous embodiment of the invention, the clamping spring has a spring bow connected to the clamping leg, wherein the actuating tab projects beyond the spring bow in the direction facing away from the clamping edge. This also facilitates a slim basic design of the spring-force clamping connection. The actuating tab can, for example, extend from a coupling point along the clamping leg to the spring bow and beyond the spring bow, where the actuating tab is coupled to the clamping leg.

[0023] The first actuating element can be designed, for example, as a movable push piece or a pivotable lever. In the case of a push piece, it can be arranged in a substantially linearly movable manner in a receiving channel of the insulating material housing. The actuating tab can be implemented in various ways, and a wide variety of possible materials can be used, in particular also electrically conductive materials such as metals.

[0024] According to an advantageous design of the present invention, the first operating element and the operating tab are forcibly coupled to the clamping spring. The operating tab can in particular be forcibly coupled to the clamping leg. In this way, the operating mechanism forcibly participates in the definite movement of the clamping spring or the clamping leg. By forcibly coupling, the first operating element and the operating tab are respectively in different positions according to whether the clamping leg is in the open position or in the clamping position. In particular, it is possible to distinguish in a simple manner whether the clamping spring is in the clamping position or in the open position for the user, which can be identified, for example, by the different positions of the first operating element relative to the insulating material housing. For example, the first operating element configured as an operating pressure piece is arranged deeper in the accommodating channel of the insulating material housing in the open position than in the clamping position.

[0025] According to an advantageous embodiment of the present invention, it is proposed that the actuating link is coupled to the clamping leg at a fixed coupling point. In this way, for example, a forced coupling of the actuating link to the clamping spring can be achieved.

[0026] According to an advantageous embodiment of the present invention, the actuating mechanism of the spring-force clamping connection comprises at least one second actuating element, which is designed as a separate component from the clamping spring and has an actuating tab. This allows the actuating tab to be designed in various forms and sizes, since the material of the clamping spring need not be used for this purpose. This prevents, in particular, weakening of the clamping spring.

[0027] According to an advantageous embodiment of the present invention, the second operating element has reinforcing ribs extending in the longitudinal direction. These ribs extend from a fastening section of the second operating element into an actuating tab. The fastening section is configured to fasten the second operating element to the clamping leg. The reinforcing ribs increase the surface moment of inertia of the second operating element and thus its rigidity. This has the advantage that a separate guide channel for guiding the actuating tab is not required in the insulating material housing. The reinforcing ribs can be pressed into the material of the second operating element.

[0028] According to an advantageous design solution of the present invention, the second operating element has at least one second form-fitting element, by means of which the second operating element can be coupled in a form-fitting manner with at least one first form-fitting element, wherein the first form-fitting element is formed as a counterpart to the second form-fitting element at the clamping leg. By connecting the first form-fitting element with the second form-fitting element, a form-fitting coupling of the second operating element and thus the operating tab with the clamping leg at a fixed coupling position can be achieved. For example, the first form-fitting element can be configured as a protruding bolt and the second form-fitting element can be configured as a bolt receptacle for accommodating the bolt. However, this association can also be carried out in reverse. For example, the second operating element can be coupled in an articulated manner to the clamping leg at a fixed coupling position, so that the second operating element can pivot relative to the clamping leg at least within a certain range via the articulated coupling. The second operating element can also be rigidly coupled in an articulated manner to the clamping leg at a fixed coupling position.

[0029] According to an advantageous embodiment of the present invention, the first operating element is formed from an insulating material and the second operating element is formed from a metallic material. Thus, the first operating element provides the required insulation for the electrical components. The second operating element can then be made from a relatively thin metallic material, saving space.

[0030] According to an advantageous embodiment of the present invention, the first operating element is fixed to the operating tab. In this way, the first operating element is held by the operating tab and cannot be lost. The first operating element can be coupled to the operating tab, for example, by a material-locking connection, a force-locking connection, and / or a form-locking connection.

[0031] According to an advantageous design solution of the present invention, the spring-force clamping connection has a release element with a release section, by which the clamping leg held on the retaining element in the open position can be released from the retaining element when the electrical conductor to be clamped applies an actuating force to the release section. This allows the clamping leg to be automatically released from the retaining element by inserting the electrical conductor. The release section can be loaded with pressure by a separate tool, a component of the terminal, such as an actuating element, or directly via the introduced electrical conductor itself, so that the clamping leg can be released from the retaining element. With the help of the release element, the clamping leg held on the retaining element in the open position can be released from the retaining element by applying pressure to the release section in the conductor insertion direction of the electrical conductor to be connected. Depending on the configuration of the spring-force clamping connection, the release element can be designed as part of the clamping spring, for example as a release element integrally formed with the clamping spring, or as a separate component.

[0032] According to an advantageous embodiment of the present invention, the retaining element is provided on the support section, the release element, or the section of the clamping spring that connects the release section to the support section. In particular, the retaining element can be integrally formed with the support section, the release element, or the section of the clamping spring that connects the release section to the support section. This eliminates the need for additional separate components. This reduces the manufacturing and assembly complexity of the spring-force clamping connection.

[0033] According to an advantageous embodiment of the present invention, the busbar has a slit-shaped opening through which the clamping spring, or at least its clamping legs, protrude. This is beneficial for securely clamping the electrical conductor to the busbar. For example, the contact section can be designed as a contact tongue cut out of the busbar material and bent away, for example, bent away from the busbar surface, at which the support section rests on the busbar. The electrical conductor to be clamped can then also be guided through the slit-shaped opening so that it is securely held therein. The slit-shaped opening can be completely or predominantly surrounded circumferentially by the busbar material.

[0034] According to an advantageous embodiment of the present invention, the clamping spring is supported with its support section on the busbar, in particular on the inside of a slit-shaped opening. This allows the clamping spring to be securely supported on both sides, so that the force of the clamping spring is kept away from the insulating material housing of the terminal. For example, both the support section and the clamping legs can extend through the slit-shaped opening.

[0035] Furthermore, the aforementioned object is achieved by a terminal having an insulating material housing with at least one wire insertion opening for accommodating an electrical wire in a wire insertion direction, wherein at least one spring-force clamping connection of the type described above is arranged in the insulating material housing. The advantages described above are also achieved as a result. The electrical wire can be introduced through the wire insertion opening in the wire insertion direction up to a clamping point between a clamping edge of a clamping leg and a contact section of a busbar and clamped there.

[0036] According to an advantageous embodiment of the present invention, a wire guide channel for guiding an electrical wire to be clamped at the contact section can be formed in the insulating material housing, wherein the release section of the release element is arranged in the wire guide channel or at least protrudes into the wire guide channel.

[0037] According to an advantageous embodiment of the present invention, the release section of the release element can be arranged behind the contact section or at least behind the clamping location in the conductor insertion direction.

[0038] According to an advantageous embodiment of the present invention, the insulating housing includes a receiving channel for accommodating and supporting the first operating element. The first operating element can be configured as an operating element movable within the receiving channel. In this manner, the first operating element can be reliably guided through the material of the insulating housing, preventing jamming and tilting during operation.

[0039] The receiving channel can be arranged substantially aligned with the spring bow of the clamping spring along the direction of movement of the first actuating element in the receiving channel. In this way, the first actuating element can be arranged, as it were, on the spring bow and need not be arranged on the clamping leg as in known terminal blocks. In this way, the conductor insertion channel can be arranged relatively close to the clamping leg.

[0040] According to an advantageous embodiment of the present invention, the first operating element has a cavity open toward the operating link, into which the operating link is sunk with its free end, so that the operating link can be reliably guided and partially accommodated during the operating process.

[0041] According to an advantageous embodiment of the invention, the cavity is delimited by a guide wall configured to bear against and guide the free end of the actuating tab, wherein the guide wall extends obliquely to the actuating direction of the first actuating element. This is also advantageous for actuating the clamping leg with low actuating forces.

[0042] In the context of the present invention, the indefinite term "one" is not to be understood as a numeral. Thus, if, for example, one component is mentioned, this should be interpreted as meaning "at least one component." Whenever an angle is specified in degrees, it relates to the dimension of a circle of 360 degrees (360°).

[0043] The present invention will be described in detail below based on embodiments using the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] The accompanying drawings show

[0045] Figure 1 A perspective view of the clamping spring in the relaxed state,

[0046] Figure 2 Shown in open position Figure 1 The clamping spring,

[0047] Figure 3 Shown in a three-dimensional view Figure 1 The clamping spring together with the second operating element,

[0048] Figure 4 A perspective view of a spring-force clamping connection,

[0049] Figure 5 The connecting terminal is shown in a side sectional view in the clamped position,

[0050] Figure 6 Shown in open position Figure 5 The terminal blocks,

[0051] Figure 7 The support section is shown in a top view according to Figure 1 The clamping spring,

[0052] Figure 8 The top view of the clamping legs shows the Figure 1 The clamping spring,

[0053] Figure 9 Shown in side view according to Figure 1 The clamping spring together with the second operating element. DETAILED DESCRIPTION

[0054] exist Figure 1 and Figure 2 The clamping spring 4 shown in FIG. 4 has a clamping leg 43, a spring bow 42 connected to the clamping leg 43, and a support section 41 connected to the spring bow 42. Furthermore, there is a retaining element 5, which is integrally formed with the clamping spring 4, in particular with a region 40 of the support section 41, which has a reduced width compared to the region of the support section 41 connected to the spring bow 42. The retaining element 5 serves to hold the clamping leg 43 in the open position, as in FIG. Figure 2 It can be seen in.

[0055] Furthermore, there is a release element 8, which is also formed integrally with the clamping spring 4, for example, as a material section which is connected to the holding element 5. The release element 8 has a release section 80 at its free end, via which the clamping leg 43, which is held on the holding element 5 in the open position, can be released from the holding element 5 when an actuating force is exerted on the release section 80 by the electrical conductor to be clamped.

[0056] A clamping tongue 45 is bent toward the free end of the clamping leg 43. The clamping tongue 45 ends at its free end with a clamping edge 46, which serves to clamp the electrical conductor. The clamping tongue 45 is therefore part of the clamping leg 43. The clamping tongue 45 can extend from the material of the clamping leg 43 and bend in a direction away from the support section 41. By extending the clamping tongue 45, a first latching element 47, for example a first latching element in the form of a protruding latching arm, remains on both sides of the clamping tongue 45. The first latching element 47 is configured to be coupled to the second latching element 50 of the retaining element 5 in a latching manner. As shown in Figure 2 As can be seen in FIG, locking takes place in the open position.

[0057] Furthermore, a first form-fitting element 44 is formed on the clamping leg 43, for example in the form of a laterally projecting projection, a lateral cutout and / or another recess. The first form-fitting element 44 serves to accommodate the second actuating element 11, as described below. Figure 3 and Figure 4 Just as described.

[0058] exist Figure 3 The second operating element 11 visible on the left in the figure has an operating tab 6. In addition, the second operating element 11 has a connecting section 62, which connects the operating tab 6 to a second form-fitting element 63 of the second operating element 11. The second form-fitting element 63 serves to fasten the second operating element 11 in a form-fitting manner on a first form-fitting element 44 of the clamping spring 4, which is configured as a counterpart for this purpose. In this case, the first form-fitting element 44 can extend into the opening at the second form-fitting element 63. By the form-fitting coupling of the second operating element 11 at the fixing point on the clamping leg 43, the second operating element 11 is forcibly coupled to the clamping spring 4 so that its movement is also carried out. In this case, the second form-fitting element 63 extends from the connecting section 62, which, in the state in which it is mounted on the clamping spring 4, Figure 3 As shown in the right part, it can extend laterally along at least a portion of the spring bow 42 and the clamping leg 43. In this embodiment, the connecting section 62 is located above the spring bow 42 as viewed from the clamping leg 43.

[0059] The actuating tab 6 is connected to the clamping leg 43 in this manner and extends from the clamping leg 43 in a direction away from the clamping leg 43 up to above the spring bow 42. The actuating tab 6 can extend directly away from the clamping leg 43, i.e., form a straight line with the clamping leg 43, or can be arranged slightly inclined relative to the clamping leg 43 via a curved region. The actuating tab 6 ends at its free end in a coupling section 60, which is designed to couple the actuating tab 6 to the first actuating element.

[0060] Figure 4 Show the basis Figure 3 The arrangement described consists of the clamping spring 4 and the second actuating element 11 after installation on the busbar 3 .

[0061] The busbar 3 can have an angled shape with a main section 30 in which a slit-shaped opening 32 is formed. The contact section 31 of the busbar 3 can extend from the main section 30 and be bent, for example, toward the release section 80. The clamping spring 4, with its support section 41, is supported on the surface of the main section 30 facing away from the contact section 31 and, in addition, is supported with the back side of the region 40 on the inside of the slit-shaped opening 32. As can be seen, both the narrower region 40 of the support section 41 and the clamping legs 43 protrude through the slit-shaped opening 32.

[0062] Figure 5 A connecting terminal 1 is shown having an insulating material housing 2 in which a connection terminal 1 is provided according to Figure 4 The insulating material housing 2 has a wire insertion opening 20 into which an electrical wire can be inserted along a wire insertion direction L and clamped at the clamping point formed between the clamping leg 43 or the clamping edge 46 and the contact section 31. Furthermore, the insulating material housing 2 has a receiving channel 21 in which the first operating element 7 is guided in the displacement direction during manual actuation. The first operating element 7 is designed as an actuating lever. The first operating element 7 has an actuating surface 70 on which a manual actuating force can be applied by a user.

[0063] Furthermore, it can be seen that the first operating element 7 has a cavity 71 for accommodating the coupling section 60 of the operating tab 6. During actuation of the first operating element 7, the coupling section 60 slides along an inner wall 72 delimiting the cavity 71. The inner wall 72 can have a wedge-shaped shape relative to the outer wall of the first operating element 7 facing the receiving channel 21, so that the operating tab 6 is deflected laterally, i.e., toward the wire insertion opening 20, due to the wedge-shaped shape. This facilitates the transmission of the operating force to the operating tab 6.

[0064] The inner wall 72 of the cavity 71 has two different inclinations or slopes, so that different force-travel distributions of the second actuating element (actuating tab) can be achieved depending on the actuating travel of the first actuating element 7 .

[0065] exist Figure 5 In the clamping position, the clamping legs 43 are in their clamping position. If no electrical conductor is inserted, the clamping legs 43 can, for example, rest against the contact section 31 or at least be in the immediate vicinity.

[0066] Figure 6 The connecting terminal 1 is shown in the actuated state, in which the clamping legs 43 are moved into the open position by manual actuation of the first actuating element 7. To this end, the user can exert a manual actuating force on the actuating surface 70 of the first actuating element 7, thereby moving the first actuating element 7 downward in the receiving channel 21. As a result, the actuating tab 6 is pivoted to the right.

[0067] In the open position, the first latching element 47 latches with the second latching element 50, so that the clamping leg 43 is held in the open position by the retaining element 5 even without applying any further actuating force to the first actuating element 7. The first actuating element 7 now visually indicates to the user that the connecting terminal 1 is in the open position by its lower position in the receiving channel 21. In the open position, the electrical conductor 9 can be positioned in the clamping location without exerting any force.

[0068] If the electrical conductor 9 is now to be clamped in the spring-force clamping connection by means of spring force, the electrical conductor 9 can simply be pressed against the release section 80. As a result, the release section 80 is slightly deflected downward, thereby canceling the latching between the first latching element 47 and the second latching element 50 and releasing the clamping leg 43 from the retaining element 5. Due to its spring force, the clamping leg 43 then springs back with the clamping edge 46 toward the electrical conductor 9 and clamps it at the contact section 31.

[0069] Figure 7 and Figure 8 An advantageous design of the clamping spring 4 is shown, which has a tapered spring bow 42. It can be seen that the width of the spring bow 42 decreases from dimension y at the transition at the clamping leg 43 to dimension x at the transition of the spring bow 42 to the support section 41. The width decreases symmetrically on both sides, that is, at both edge edges of the spring bow 42. The width can decrease uniformly or continuously, in particular linearly, over the arc length of the spring bow 42. This results in a material weakening 48 on both sides of the spring bow 42.

[0070] 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 is located in the region of the spring bow 42. Figure 9 As shown, in the spring force clamping connection according to the invention, the virtual axis of rotation is shifted into the region A marked there, which is arranged relatively close to the transition of the spring bow 42 to the bearing section 41. In particular, the virtual axis of rotation can be located within the first 20% of the arc length B of the spring bow, viewed starting from the bearing section 41.

[0071] Reference Signs List

[0072] 1 terminal block

[0073] 2Insulating material shell

[0074] 3 busbars

[0075] 4 Clamping spring

[0076] 5. Holding element

[0077] 6 operating tabs

[0078] 7 First operating element

[0079] 8 Loosen components

[0080] 9 electrical wires

[0081] 11 Second operating element

[0082] 20 wire entry openings

[0083] 21 Accommodation Channel

[0084] 30 main sections

[0085] 31 contact section

[0086] 32 slit-like opening

[0087] 40 Support section area

[0088] 41 Support section

[0089] 42 Spring Bow

[0090] 43 Clamp your legs

[0091] 44 first form-fitting element

[0092] 45 clamping tongue

[0093] 46 Clamping edge

[0094] 47 first locking element

[0095] 48 Material weakening part

[0096] 50 second locking element

[0097] 60 coupling section

[0098] 62 connecting section

[0099] 63 second form-fitting element

[0100] 70 control surfaces

[0101] 71 cavity

[0102] 72 inner wall

[0103] 80 loose section

[0104] Arc length B

[0105] L conductor introduction direction

Claims

1. A spring-force clamping connection for connecting an electrical conductor (9) by means of spring force, wherein the spring-force clamping connection comprises at least one busbar (3) and a clamping spring (4), the clamping spring having a clamping leg (43) having a clamping edge (46) for clamping the electrical conductor (9) to a contact section (31) of the busbar (3), the clamping spring (4) having a supporting section (41) and a spring bow (42) connecting the supporting section (41) to the clamping leg (43), and the spring-force clamping connection comprises a retaining element (5) configured to retain the clamping leg (43) in an open position, the spring-force clamping connection comprising at least one first operating element (7) for transferring the clamping leg (43) into the open position by manually actuating the first operating element (7). It is characterized by: The spring bow (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 is located in the region of the spring bow (42) and is arranged closer to the transition of the spring bow (42) to the bearing section (41) than to the transition of the spring bow (42) to the clamping leg (43).

2. The spring force clamping connection according to claim 1, characterized in that The virtual axis of rotation is arranged on the arc length (B) of the spring bow (42) in the range of 20% of the total arc length (B), as viewed starting from the bearing section (41).

3. The spring force clamping connection according to claim 1, characterized in that The first actuating element (7) has an action section (70) via which the first actuating element (7) can be manually acted upon with an actuating force, wherein the action section (70) is arranged substantially centrally relative to the spring bow (42).

4. The spring force clamping connection according to claim 1, characterized in that The spring bow (42) has at least one material weakening (48) which is punctiform and / or continuous over the arc length (B) of the spring bow (42), by which the virtual axis of rotation is formed.

5. The spring force clamping connection according to any one of the preceding claims, characterized in that The clamping spring (4) has a constriction in the region of the spring bow (42).

6. The spring force clamping connection according to claim 5, characterized in that The constrictions are formed symmetrically at two edge edges of the spring bow (42).

7. The spring force clamping connection according to any one of the preceding claims, characterized in that The width of the spring bow (42) decreases continuously from the clamping leg (43) to the supporting section (41).

8. The spring force clamping connection according to any one of the preceding claims, characterized in that The width of the spring bow (42) at the transition from the spring bow (42) to the support section (41) is smaller than the width of the support section (41).

9. The spring force clamping connection according to any one of the preceding claims, characterized in that An actuating link (6) projects from the clamping leg (43) toward the first actuating element (7), wherein the actuating link (6) is configured to transmit a manual actuating force applied to the first actuating element (7) to the clamping leg (43).

10. The spring force clamping connection according to claim 9, characterized in that The clamping spring (4) has a spring bow (42) connected to the clamping leg (43), wherein the actuating tab (6) projects beyond the spring bow (42) in a direction facing away from the clamping edge (46).

11. The spring force clamping connection according to any one of claims 9 to 10, characterized in that The first actuating element (7) has a cavity (71) which is open toward the actuating link (6), and into which the actuating link (6) is immersed with its free end.

12. The spring force clamping connection according to any one of the preceding claims, characterized in that The spring-force clamping connection has a release element (8) with a release section (80), by which a clamping leg (43) held on the retaining element (5) in the open position can be released from the retaining element (5) when an electrical conductor (9) to be clamped exerts an actuating force on the release section (80).

13. The spring force clamping connection according to any one of the preceding claims, characterized in that The retaining element (5) is arranged on the bearing section (41), on the release element (8), or on a section of the clamping spring (4) that connects the release section (80) to the bearing section (41).

14. The spring force clamping connection according to any one of the preceding claims, characterized in that The busbar (3) has a slit-shaped opening (32) through which the clamping spring (4) or at least its clamping legs (43) protrude.

15. A terminal (1) having an insulating material housing (2), the insulating material housing having at least one wire insertion opening (20) for receiving an electrical wire (9) in a wire insertion direction (L), characterized in that At least one spring-force clamping connection according to any of the preceding claims is arranged in the insulating material housing (2).

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