Spring force clamping connection piece and connection terminal

Abstract

The invention relates to a spring-loaded clamping connection, comprising: a clamping spring, which has a clamping leg, which has a clamping edge at the free end of the clamping leg, a bearing leg for bearing the clamping spring, and a spring bow, which connects the bearing leg to the clamping leg; the clamping leg has a clamping edge and a clamping section, a busbar having a clamping section, the clamping edge and the clamping section of the clamping leg being configured to clamp the electrical conductor between the clamping edge and the clamping section, and a conductor assembly having a conductor assembly, and a locking section which has a retaining contour and forms a clamping edge for locking the clamping leg, said clamping edge being pivoted away from the clamping section of the busbar into the open position. The invention also relates to a connection terminal having an insulating material housing and having such a spring force clamping connection.

Description

Technical Field

[0001] The present invention relates to a spring force clamping connector, which has:

[0002] - a clamping spring having clamping legs, support legs for supporting the clamping spring, and a spring bow, wherein the clamping legs have clamping edges at the free ends of the clamping legs, and the spring bow connects the support legs to the clamping legs,

[0003] - a bus bar having a clamping section, wherein the clamping legs together with their clamping edges and the clamping section form a structure for clamping an electrical wire between the clamping edge and the clamping section, and

[0004] - a locking section having a retaining profile and configured to lock the clamping edges of the clamping legs pivoted away from the clamping section of the bus bar to an open position.

[0005] The present invention further relates to a terminal block having an insulating material housing and such a spring force clamping connector. Background Art

[0006] DE 10 2020 119 373 A1 shows a terminal block having an insulating material housing with a wire introduction opening for accommodating an electrical wire in a wire introduction direction, having a bus bar section, and having a clamping spring. The clamping spring has clamping legs, and the clamping legs together with the bus bar section form a clamping site for the electrical wire, wherein the clamping legs can be locked at the terminal block in an open position of the clamping site. The clamping spring has support legs, and the support legs have a fastening section configured to fasten the clamping spring to the bus bar section, a holding section configured to hold the clamping legs in the open position of the clamping site, and a release section configured to release the locking of the clamping legs in the case of the open position of the clamping site.

[0007] DE 20 2011 051 466 U1 discloses a clamping spring for a connection terminal, which has clamping legs, a first tensioning device for pre-tensioning the clamping legs to a clamping position, and an operable locking leg for fixing the clamping legs in the tensioned position. The locking leg includes an operating section operable by a conductive area of a cable in an operating direction, and by using the operating section, the locking leg can be changed from the tensioned position to an operated release position, in which the locking leg releases the clamping legs to move towards the clamping position.

[0008] WO 2021 / 105280 A1 discloses a spring-force terminal implemented as a direct plug-in terminal for connecting electrical conductors, the spring-force terminal having a busbar, a clamping spring acting as a compression spring, and a retaining spring for locking the clamping spring in the open position. The clamping spring has a clamping leg pivotable about a first pivot axis, the clamping leg having a clamping edge. The retaining spring has a pivot leg pivotable about a second pivot axis. The pivot leg has at least one retaining mechanism and the clamping leg has a locking mechanism that interacts therewith in the latched state of the clamping leg. The clamping leg can be displaced from the latched state to the clamping state by moving the electrical conductor, in which state the clamping leg is unlocked and presses the electrical conductor together with the clamping edge against the busbar. The locking mechanism of the clamping leg is spaced apart from the clamping edge. Summary of the Invention

[0009] Starting from this, the object of the present invention is to achieve an improved spring-force clamping connection and a connection terminal equipped with such a spring-force clamping connection.

[0010] This object is achieved by means of a spring-force clamping connection having the features of an embodiment according to the invention and by means of a connection terminal having the features of an embodiment according to the invention. Advantageous embodiments are described in the description.

[0011] In an advantageous embodiment, it is proposed that the clamping edge of the clamping leg can pivot on a first circular track and the retaining profile of the locking section can pivot on a second circular track, wherein the first circular track and the second circular track are different from each other and intersect in the locking position, in which the retaining profile forms a stop for the clamping edge pivoting on the first circular track into the open position.

[0012] This enables improved kinematic coordination of the movement.

[0013] Advantageously, the retaining profile has a bearing surface transverse to the second circular track and the first circular track intersects the bearing surface. When the clamping leg pivots from the open initial position or the clamping position into the open position, the locking section can pivot on the second circular track by the clamping leg sliding along the bearing surface. After leaving the bearing surface, the spring-elastic locking section can snap back, such that the retaining profile is then in front of the end of the clamping leg and forms a stop for the clamping leg. The clamping leg is thereby held in the open position.

[0014] The clamping edge of the clamping leg and the clamping section of the busbar form a clamping site, in which an electrical conductor can be clamped between the clamping edge and the clamping section. In the open position, the clamping site is open, such that the electrical conductor can be inserted into or removed from the spring-force clamping connection. Here, a stop for the clamping leg is provided by the retaining profile in such a way that the clamping leg is form-fittingly locked or latched at the retaining profile.

[0015] The second circular track can be in the following positions: in these positions, by means of the retaining edge, the clamping edge is locked by forming a stop for the clamping leg and preventing the clamping leg from pivoting back from the open position towards the clamping section into the clamping position, and the first circular surface formed by the clamping spring together with its center of rotation and the first circular track is in the clamping position.

[0016] The center of rotation of the first circular track should be understood as the (virtual) approximate center of the first circular track, which is described by the clamping edge when moving from the clamping position to the open position. The second circular track correspondingly has a (virtual) center of rotation around which the retaining profile pivots on the second circular track.

[0017] The radius of the first circular track of the clamping edge is preferably greater than the radius of the second circular track of the retaining edge. In the case of the same pivot angle, the path passed from the locking section to locking or unlocking is smaller than the stroke of the clamping leg. However, only a small stroke is required to lock or unlock the clamping leg with the retaining edge. By means of different centers of rotation, the smaller stroke of the retaining edge is coordinated with the required large stroke of the clamping leg, and hereby a compact and kinematically well - constructed solution for the open holding and unlocking of the clamping leg is achieved.

[0018] The locking section can be a plate element which has a retaining edge bent out of the plane of the plate element.

[0019] The locking section can be integrally formed with the support leg. Thereby, a spring - force clamping connection which can be simply manufactured and installed with low expenditure can be achieved, and the spring - force clamping connection is constructed compactly and stably.

[0020] The locking leg can be connected to the support leg. The support leg connected to the spring bow continues through the locking leg. The locking leg can form the freely movable end of a bent clamping spring. The clamping edge of the clamping leg can form the other free end.

[0021] The locking section can form a trigger surface which, by means of the force of a touched electrical conductor, is displaced together with the retaining profile in order to unlock the clamping spring.

[0022] The busbar may have a wire-through guiding opening. Then, the clamping spring, the clamping leg and the supporting leg extend into the wire-through guiding opening. "Extend into" should also be understood as an alternative where the supporting leg or at least the clamping leg extends through the wire-through guiding opening. The supporting leg may abut against the first end side delimiting the wire-through guiding opening, and the busbar has a clamping projection at the second end side of the wire-through guiding opening, which clamping projection extends away from the plane of the busbar unfolded by the wire-through guiding opening and forms a clamping section for clamping an electrical wire between the clamping edge of the clamping leg and the clamping projection.

[0023] Such a wire-through guiding opening of the busbar may have a flange, which flange partially or completely surrounds the wire-through guiding opening and extends towards the locking section from the plane of the busbar unfolded by the wire-through guiding opening. Thereby, the locking section can form a triggering surface for unlocking the clamping spring by a touched electrical wire.

[0024] The clamping section may be formed at such a flange.

[0025] The busbar may have a plurality of wire-passing openings, each of which has a clamping spring arranged thereon. At least one of the clamping springs is here equipped with the above-mentioned locking section for locking the clamping leg in the open position. With such a common busbar, for example, in an embodiment of a terminal block, it is possible to electrically connect a plurality of electrical wires to each other via the common busbar.

[0026] The clamping spring may be a helical torsion spring.

[0027] In such a spring-force clamping connection, the locking section may be integrally formed with the clamping spring as an extension of the abutting section, and the retaining profile of the locking section is configured as a tab provided at the lateral edge of the locking section and bent towards the clamping leg.

[0028] The retaining profile can be displaced from the locking position to the unlocking position by elastic bending and / or pivoting of the locking section. When the locking section pivots, the plane of the second circular orbit traced by the retaining profile during pivoting is preferably in or parallel to the plane of the first circular orbit traced by the clamping edge of the clamping leg during pivoting. During elastic bending, the retaining profile can also be displaced at an angle away from the plane of the first circular orbit of the clamping leg.

[0029] In such a terminal with an insulating material housing, at least one of the above spring force clamping connectors according to the invention is inserted into the insulating material housing, wherein the insulating material housing has a wire introduction opening leading to a trigger surface of a locking section. Thereby, the retaining profile can be displaced by the force of the electrical wire to be clamped touching the trigger surface, so as to unlock the clamped position locked in the open position and clamp the electrical wire and the clamping leg at the bus bar.

[0030] The intersection of the first circular track and the second circular track can be in the alignment line (Flucht) of the wire introduction opening extending towards the clamping part.

[0031] The insulating material housing can have an operating opening leading towards the operating surface of the clamping leg.

[0032] The operating opening can be configured to accommodate an operating tool or an operating element movably inserted into the operating opening.

[0033] The clamping leg can be displaced towards the support leg against the force of the clamping spring to the open position by the operating tool introduced into the operating opening or the operating element inserted into the operating opening until the clamping leg is locked in the open position by the retaining profile forming a stop.

[0034] The operating element can be non - losingly inserted into the operating opening, for example, by form - fit. For example, a movable pressure lever, a pivotable lever or a rotatable shaft are suitable as the operating element. Such an operating element can be form - fit and movably engaged with the insulating material housing by a stop element or a bearing. A screwdriver is usually used as the operating tool.

[0035] Generally speaking, within the scope of this application, the word "a / an", unless explicitly otherwise defined, should not be understood as a numeral, but as an indefinite article with the meaning of "at least one / a". Description of the Drawings

[0036] The present invention allows different embodiments and is hereinafter described in detail by way of example according to the embodiments. The drawings show:

[0037] Figure 1 A side sectional view of a terminal showing a clamping spring in a closed initial position;

[0038] Figure 2 A side sectional view of a terminal showing a clamping spring in an open reserve position;

[0039] Figure 3 A side sectional view of a terminal showing a clamping spring in a locked open position;

[0040] Figure 4Side sectional view of a terminal with a clamping spring in a locked open position together with an inserted electrical conductor;

[0041] Figure 5 Side sectional view of a terminal with a clamping spring unlocked by operating a locking section;

[0042] Figure 6 Side sectional view of a terminal with an unlocked clamping spring in a clamping position together with a clamped electrical conductor;

[0043] Figure 7 Stereoscopic view of a clamping spring in an unlocked initial position, viewed from the perspective of looking at the clamping legs;

[0044] Figure 8 Stereoscopic view of a clamping spring in an unlocked initial position, viewed from the perspective of looking at the support legs;

[0045] Figure 9 Stereoscopic view of a clamping spring in a locked open position, viewed from the perspective of looking at the clamping legs;

[0046] Figure 10 Stereoscopic view of a clamping spring in a locked open position, viewed from the perspective of looking at the support legs. Detailed description of the specific implementation

[0047] Figure 1 Side sectional view showing a terminal 1 having an insulating material housing 2 and a spring force clamping connection 3 fitted therein.

[0048] The insulating material housing 2 has a wire introduction opening 4, the bounding wall of which extends in the wire insertion direction L.

[0049] The spring force clamping connection 3 has a clamping spring 5 and a busbar 6. The clamping spring 5 has a support leg 7 supported at the busbar 6, a clamping leg 8, and a spring bow 9 that connects the clamping leg 8 to the support leg 7.

[0050] In the illustrated embodiment, the busbar 6 has a wire through-guiding opening 10 in the plane of the busbar 6, which is terminated by a flange 11 on the lower side of the busbar 6 opposite the wire introduction opening 4. The flange 11 surrounds the wire through-guiding opening 10.

[0051] The support leg 7 abuts against the first end side 12 or end side wall of the flange 11. The opposite second end side 13 or end side wall is inclined towards the first end side 12 to provide a clamping section 14 that enters the alignment line of the wire introduction opening 4. The clamping section may be provided in the end region of the second end side 13.

[0052] The clamping leg 8 has a clamping edge 15 at its free end, which is used to clamp the electrical conductor between the clamping section 14 of the busbar 6 and the clamping edge 10.

[0053] The clamping leg 8 is in the closed initial position and can abut against the second end side 13 of the flange here. Figure 1 in and can abut against the second end side 13 of the flange here.

[0054] The first end side and the second end sides 12, 13 are connected to the longitudinal side walls 16 of the flange 11. It is conceivable that there is only one longitudinal side wall 16 and the other longitudinal side is open. Thereby, the wire through - guiding opening 10 is only partially surrounded by the flange 11. Preferably, however, a complete flanging section with two parallel and spaced - apart longitudinal side walls 16 is provided. Thereby, the cross - section for guiding the current is increased and the stability of the busbar 6 is improved.

[0055] In addition to the wire - introducing opening 4, the insulating - material housing 2 has an operating opening 17, which leads into the clamping leg 8 in the interior space. Thereby, an operating force can be applied to the operating surface B of the clamping leg 8 by an operating tool introduced into the operating opening 17 or, as shown, by using an operating element 18 inserted into the operating opening 17, in order to pivot the clamping leg towards the supporting leg 7, thereby opening the clamping site. The operating element 18 can then be implemented, for example, as a movably supported operating pressure lever. The operating pressure lever can be non - losingly fastened to the insulating - material housing 2 by a form - fit 19.

[0056] The clamping spring 5 has a locking section 20, which has a retaining profile 21. As shown, the locking section can be connected to the supporting leg 7. Here, the locking section 20 can be cut out from the width of the supporting leg 7, where the remaining free - end region 21 of the supporting leg 7 is bent such that the end region abuts against the first end wall 12 of the flange 11. The locking section 20 bends out of the plane of the free - end region 21 of the supporting leg 7 and extends with a triggering surface 22 transversely to the alignment line of the wire - introducing opening 4. Thereby, the electrical conductor introduced into the wire - introducing opening 4 and threaded through the wire through - guiding opening 10 in the wire - introducing direction L touches the obstructive triggering surface 22.

[0057] It can be seen that the insulating - material housing 2 has a wire - receiving pocket 23 in the space below the flange 11, that is, opposite to the wire - introducing opening 4, in which the movable end of the locking section 20 is received.

[0058] It is clear that, for example, in the region of the triggering surface 22 as shown, the retaining profile 24 projects from the locking section 20 towards the clamping leg 8.

[0059] Figure 2 A side sectional view of the terminal 1 showing the clamping spring 5 in the open reserve position is presented. For this purpose, the operating element 17 is moved towards the clamping leg 8 and an operating force is applied via the operating element 17, by which the clamping leg 8 pivots towards the support leg 7 against the spring force stored in the spring bow 9.

[0060] It can be seen that the clamping edge 15 slides along the upper edge of the holding profile 20 that is inclined with respect to the extending direction of the end section of the clamping leg 8. Thereby, the locking section 20 can pivot downward away from the clamping leg 8 and the bus bar 6 in order to guide the clamping leg 8 past the holding profile 20.

[0061] Figure 3 A side sectional view of the terminal 1 showing the clamping spring 5 now in the locked open position is presented.

[0062] It can be seen that the locking section 20 pivots again towards the bus bar 6, such that the clamping leg 8 positions its clamping edge 15 behind the holding profile 24. Thereby, the holding profile 24 forms a stop for the clamping leg 8 to hold the clamping spring 5 in the open position.

[0063] The holding profile 24 can be tapered towards the support leg 7 in order to achieve a reduced stop point or stop surface there.

[0064] The semi - circle representing the pivot radius is shown in dashed lines. On the one hand, the clamping edge 15 of the clamping leg pivots with the pivot radius in the path from the Figure 1 initial position to the open position, and on the other hand, the stop point of the holding profile 24 pivots with the pivot radius in the transition from the initial position to the open position.

[0065] It is clear that the clamping leg 8 pivots about a first pivot point D1 on a first circular orbit K1, which has a greater radius from the first pivot point D1 to the clamping edge 15 compared to a second circular orbit K2 traced by the stop point of the holding profile 24. The second pivot point D2 of the locking section 20 is remote from the first pivot point D1 of the clamping leg 8. The first pivot point D1 of the clamping leg 8 is in the region of the spring bow 9, while the second pivot point D2 can be in the region between the end 21 of the support leg 7 and the section of the locking section 20 that is bent transversely to the wire introduction direction L. The radius of the second circular orbit K2 of the locking section 20 having the second pivot point D2 is significantly smaller than the radius of the first circular orbit K1 of the clamping leg having the first pivot point D1. The circular orbits K1, K2 intersect at the contact point. The circular orbits extend at an angle to each other.

[0066] In the illustrated embodiment, the semi - circles of the first and second circular orbits K1, K2 are respectively unfolded in a plane, where the plane is the same plane or parallel planes.

[0067] Figure 4 Side sectional view of the terminal 1 with the clamping spring 5 in the locked open position. The electrical conductor 25 is inserted into the conductor inlet opening 4 and guided through the conductor through-opening 10 in the conductor inlet direction L. The stripped end of the electrical conductor 25 is guided from the space surrounded by the flange 11 into the conductor receiving pocket and touches the trigger surface 22 which is transverse to the conductor through-opening 10. Thereby, a triggering force is exerted by the electrical conductor 25 on the locking section 16 in the conductor insertion direction L, by which the locking section 16 pivots about the second pivot point D2 on the second circular track K2.

[0068] Thereby, the stop of the holding profile 24 against the free end of the clamping leg 8 is cancelled and the clamping leg 8 can pivot away from the support leg 7 and towards the clamping section 14 from the open position by the force of the clamping spring 5. This is shown in Figure 5 which. There can be seen a side sectional view of the terminal 1 with the clamping spring 5 unlocked in the clamping position.

[0069] It is clear that the locking section 20 pivots slightly downwards with its trigger surface 22 away from the busbar 6. This short stroke is sufficient to release the path of the clamping leg 8 past the holding profile 14.

[0070] Figure 6 Side sectional view of the terminal 1 with the unlocked clamping spring 5 in the clamping position together with the clamped electrical conductor 25. It can be seen that the clamping edge 15 of the clamping leg 8 pivots past the holding profile 24 and now abuts at the stripped end of the electrical conductor 25. Thereby, the clamping spring 5 exerts a clamping force on the electrical conductor 25, which clamping force is directed against the opposing clamping section 14 of the second end wall 13. Thus, the electrical conductor 25 is conductively clamped to the busbar 6 at the clamping site between the clamping edge 15 and the clamping section 14.

[0071] Figure 7 Stereoscopic view of the clamping spring 5 in the unlocked initial position from the perspective looking at the clamping leg 8.

[0072] It is clear that the clamping spring 5 is embodied as a helical torsion spring. The helical torsion spring has a bent clamping leg 8 which provides a clamping edge 15 for clamping the electrical conductor 25 at the free end.

[0073] The locking section 20 is integrally formed with the extension 7 of the support leg and the clamping spring 5. Here, in the transition to the locking section 20, the two remaining lateral free end regions 21 of the support leg 7 are bent away from the clamping leg 8 from the above-mentioned alignment line of the support leg 7. The region therebetween forms the locking section 20, and the locking section has a smaller width from the root region due to the remaining end regions 21 compared to the width of the support leg 7 in the root region.

[0074] Thus, the locking section 20 has a bend towards the clamping leg 8, and the retaining profile 24 is connected to the bend. The retaining profile 24 of the locking section 20 is formed by a tab 26, which is arranged at the lateral edge of the locking section 20 and bends from the plane of the locking section 20 towards the clamping leg 8. The tab 26 is cut out from the sheet material of the locking section 20 and bent upwards from the edge. Here, a platform serving as the trigger surface 22 remains at the free end of the locking section 20. The platform is wider than the intermediate space between it and the tab of the retaining profile 24 connected thereto and serves as the trigger surface 22.

[0075] Figure 8 A perspective view of the clamping spring in the initial unlocked position is shown from the perspective of looking at the support leg 7.

[0076] It can be seen that in the transition from the root region to the locking section 20, these two lateral free end regions 21 are spaced apart from each other and are bent away from the plane of the root region at the two lateral edge regions of the support leg 7 and extend at an acute angle with respect to the locking section 20 therebetween.

[0077] It is also clear that the locking section 20 tapers into a free end region after bending at an obtuse internal angle (e.g., approximately 120°) towards the clamping leg 8, and the end region has a retaining profile 24 and a wider trigger surface 22 connected thereto. The tabs 26 are bent upwards from the sheet material of the locking section 20 at the opposite side edges towards the clamping leg 8. Thereby, a pocket for receiving the stripped end of the electrical wire 25 to be clamped is formed, which is bounded by the trigger surface 22 as the bottom and the tabs 26 as the side walls.

[0078] Figure 9 A perspective view of the clamping spring 5 in the locked open position can be seen from the perspective of looking at the clamping leg 8.

[0079] It is clear that the free end of the clamping leg 8 is positioned behind the tab 26 of the retaining profile 24 with its clamping edge. Thereby, the tab 26 forms a stop for the clamping leg 8 with its end edge facing the support leg 7 in order to hold the clamping leg in the open position.

[0080] The locking section 20 is spring-elastic such that contact with the electrical conductor 25 on the trigger surface 22 exerts a triggering force and holds the profile 24 displaced downward away from the clamping leg 8. Thereby the stop can be canceled and the clamping leg 8 can be pivoted by the force of the clamping spring 5 away from the support leg 7 into the closed clamping position or the initial position.

[0081] Figure 10 Perspective view of the clamping spring in the locked open position, shown from the perspective looking at the support leg.

[0082] It can be seen here that the free end of the clamping leg 8 strikes against the end edge of the tab 26, which end edge faces the support leg 7. It is also clear that the platform of the trigger surface 22 projects transversely to the plane of the end of the clamping leg 8 locked in the open position such that a triggering force acting almost in the extension direction of the clamping leg end can act.

[0083] List of reference numerals

[0084] 1 Terminal

[0085] 2 Insulating material housing

[0086] 3 Spring-force clamping connection

[0087] 4 Wire introduction opening

[0088] 5 Clamping spring

[0089] 6 Busbar

[0090] 7 Support leg

[0091] 8 Clamping leg

[0092] 9 Spring bow

[0093] 10 Wire through-guidance opening

[0094] 11 Flange

[0095] 12 First end side

[0096] 13 Second end side

[0097] 14 Clamping section

[0098] 15 Clamping edge

[0099] 16 Longitudinal side wall

[0100] 17 Operating opening

[0101] 18 Operating element

[0102] 19 Form fit

[0103] 20 Locking section

[0104] 21 Free end region

[0105] 22 Trigger surface

[0106] 23 Conductor receiving pocket

[0107] 24 Retaining profile

[0108] 25 Electrical conductor

[0109] 26 Tab

[0110] B Operating surface

[0111] D1 Rotation point

[0112] D2 Rotation point

[0113] K1 First circular orbit

[0114] K2 Second circular orbit

[0115] L Conductor insertion direction

Claims

1. A spring force clamping connector (3), the spring force clamping connector comprising: - a clamping spring (5) having a spring bow (9), a clamping leg (8) and a support leg (7) for supporting the clamping spring (5), the clamping leg having a clamping edge (15) at the free end of the clamping leg (8), the spring bow connecting the support leg (7) to the clamping leg (8), - a busbar (6) having a clamping section (14), wherein the clamping leg (8) with its clamping edge (15) and the clamping section (14) is designed to clamp an electrical conductor between the clamping edge (15) and the clamping section (14), and a locking section (20) having a retaining contour (24) and forming a clamping edge (15) for locking the clamping leg (8) pivoted away from the clamping section (14) into an open position, It is characterized in that The locking section (20) is integrally formed with the clamping spring (5) as an extension of the support leg (7), and the retaining contour (24) is formed by a web (26) which is arranged at a lateral edge of the locking section (20) and is bent toward the clamping leg (8), wherein the web (26) is bent upward from the locking section (20) toward the clamping leg (8) at mutually opposite lateral edges.

2. The spring force clamping connection (3) according to claim 1, characterized in that The clamping edge (15) is pivotable on a first circular track (K1) and the retaining contour (24) is pivotable on a second circular track (K2), wherein the first and second circular tracks (K1, K2) are different from one another and intersect in a locked position, in which the retaining contour (24) forms a stop for the clamping edge (15) pivoted on the first circular track (K1) into the open position.

3. The spring force clamping connection (3) according to any one of the preceding claims, characterized in that The second circular track (K2) is in a position in which the clamping edge (15) is locked by the retaining contour (24) by forming a stop for the clamping leg (8) and the clamping leg (8) is prevented from pivoting back from the open position toward the clamping section (14) into the clamping position in which a first circular surface formed by the clamping spring (5) with its center of rotation and the first circular track (K1) is located.

4. The spring force clamping connection (3) according to any one of the preceding claims, characterized in that The radius of the first circular path (K1) of the clamping edge (15) is greater than the radius of the second circular path (K2) of the retaining edge of the retaining contour (24) which forms the stop for the clamping leg (8).

5. The spring force clamping connection (3) according to any one of the preceding claims, characterized in that The locking section (20) is a sheet metal element.

6. The spring force clamping connection (3) according to any one of the preceding claims, characterized in that The locking section (20) is formed integrally with the support leg (7).

7. The spring force clamping connection (3) according to claim 6, characterized in that The locking section (20) is connected to the supporting leg (7).

8. The spring force clamping connection (3) according to any one of the preceding claims, characterized in that The retaining contour (24) has a bearing surface which is transverse to the second circular path (K2) and with which the first circular path (K1) described by the free end of the clamping leg (8) when pivoted into the open position intersects.

9. The spring force clamping connection (3) according to any one of the preceding claims, characterized in that The busbar (6) has a conductor guide opening (10), and the clamping spring (5) extends into the conductor guide opening (10) with the clamping leg (8) and the supporting leg (7), wherein the supporting leg (7) abuts against a first end side (12) delimiting the conductor guide opening (10), and the busbar (6) has a clamping projection at a second end side (13) of the conductor guide opening (10), the clamping projection extending away from a plane of the busbar (6) extending through the conductor guide opening (10) and forming a clamping section (14) for clamping an electrical conductor between the clamping edge (15) and the clamping projection.

10. The spring force clamping connection (3) according to any one of the preceding claims, characterized in that The wire guide opening (10) of the busbar (6) has a flange (11), which partially or completely surrounds the wire guide opening (10) and extends from the plane of the busbar (6) extending through the wire guide opening (10) toward the locking section (20).

11. The spring force clamping connection (3) according to claim 10, characterized in that The clamping section (14) is formed on the flange (11).

12. The spring force clamping connection (3) according to any one of the preceding claims, characterized in that The busbar (6) has a plurality of wire insertion openings (10), each of which has a clamping spring (5) arranged thereon.

13. The spring force clamping connection (3) according to any one of the preceding claims, characterized in that The clamping spring (5) is a helical torsion spring.

14. The spring force clamping connection (3) according to any one of the preceding claims, characterized in that The clamping edge (15) is pivotable on a first circular track (K1) and the retaining contour (24) is pivotable on a second circular track (K2), wherein the first and second circular tracks (K1, K2) are different from each other and intersect in a locked position, in which the retaining contour (24) forms a stop for the free end of the clamping leg (8) pivoted on the first circular track (K1) into an open position.

15. A connecting terminal (1), comprising an insulating material housing (2) and a spring force clamping connection (3) in the insulating material housing (2) according to any one of the preceding claims, wherein the insulating material housing (2) has a wire insertion opening (4) leading to a triggering surface (22) of a locking section (20).

16. The connecting terminal (1) according to claim 15, characterized in that The intersection point of the first circular track and the second circular track (K1, K2) lies in the alignment line of the conductor insertion opening (1) extending toward the clamping point.

17. The connecting terminal (1) according to claim 15 or 16, characterized in that: The insulating material housing (2) has an actuating opening (17) which leads toward an actuating surface (B) of the clamping leg (8).

18. The connecting terminal (1) according to claim 17, characterized in that The operating opening (17) is designed to receive an operating tool or an operating element which is movably inserted into the operating opening (17).

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