Spring clamp connection and conductor connection terminal

Abstract

A spring-loaded clamping connection (3) comprising a busbar (5) and a clamping spring (6), which has a clamping leg (9) with a clamping edge (17) for clamping an electrical conductor (39) to the busbar (5), a support leg (10) which rests against the busbar (5) and supports the clamping spring (6) on the busbar (5), and a spring arc (18) which connects the support leg (10) to the clamping leg (9), characterized in that the spring-loaded clamping connection (3) has an open-holding element (7) with a spring-elastic locking arm (11) having a detent contour (12), which in an open-holding position, in which the clamping leg (9) is deflected against the spring force towards the support leg (10), is positioned laterally next to the side edge of the clamping leg (9) and for detenting the clamping element (11) against the spring force of the clamping spring (6) towards the support leg (10) in the open-holding position. (10) the deflected clamping leg (9) is formed with the detent contour (12),and that the holding element (7) has a release section (13), wherein the release section (13) is designed to be deflected by an electrical conductor (39) inserted for clamping to the busbar (5) and thereby to displace the elastically spring-loaded locking arm (11) away from the side edge of the clamping leg (9) and to release the clamping leg (9) which is locked in the holding position on the locking contour (12).

Description

The invention relates to a spring force clamping connection having a busbar and a clamping spring which has a clamping limb having a clamping edge for clamping an electrical conductor to the busbar, an abutment limb which bears against the busbar and supports the clamping spring on the busbar, and a spring bow which connects the abutment limb to the clamping limb.The invention further relates to a conductor connection terminal having an insulating material housing and such a spring force clamping terminal, wherein the insulating material housing has a conductor insertion opening for inserting an electrical conductor to a clamping point formed between a busbar clamping section of the busbar and the clamping edge of the clamping limb, in order to clamp the inserted electrical conductor between the busbar clamping section and the clamping point,Spring force clamping connections serve for clamping an electrical conductor to a clamping point which is formed between the clamping limb of a clamping spring and a busbar. For clamping the electrical conductor, the clamping spring is pressed away from the busbar by the electrical conductor against the force of the clamping spring during the direct plug connection. This is possible for rigid conductors, but not for multi-turn conductors or stranded conductors.There is a need for clamping electrical conductors to provide a spring force clamping terminal in a self-holding manner in an open position. It is often desired that the conductor connection terminals are delivered at the factory with the spring force clamping terminal open.EP 2 768 079 B1 discloses a spring force clamp designed as a direct plug-in clamp for connecting an electrical conductor, which has a busbar for contacting an electrical conductor and a clamping spring acting as a compression spring for fixing the electrical conductor in the spring force clamp. The clamping spring has a clamping leg which can be pivoted about a pivot axis in a pivot direction and which can be adjusted from a latching state, in which it is latched on a holding means, by displacement of the electrical conductor into a clamping state, in which it is unlatched from the holding means and presses the electrical conductor against the busbar. The spring force clamp also comprises a restoring means for pivoting the clamping leg back, with which the clamping leg can be pivoted back from the clamping state into the latching state by displacing the restoring means counter to the pivoting direction.EP 3 469 659 B1 describes a spring force clamp for connecting an electrical conductor to a housing, a busbar for contacting the electrical conductor, and a clamping spring having a clamping leg which can be transferred between a release position for inserting the electrical conductor into the housing and a clamping position for clamping the electrical conductor in contact with the busbar. A release and holding spring is provided with a release section for transferring the clamping leg from the release position into the clamping position and with a holding section for holding the clamping leg in the release position. A latching device is provided with a first latching element on the holding section of the release and holding spring and with a second latching element on the clamping spring, wherein the clamping leg is arranged in the release position in the latched state of the first and second latching elements and in the unlatched state of the first and second latching elements in the clamping position. The second latching element is provided on a rear side of the clamping leg of the clamping spring facing away from the receptacle for the electrical conductor, wherein the second latching element has at least one latching wing which projects from a longitudinal edge of the clamping leg of the clamping spring. The first latching element has at least one latching nose on the holding section of the release and holding spring, which latching nose is arranged in the release position on the rear side of the clamping limb facing away from the receptacle for the electrical conductor. The holding section of the release and holding spring is plate-shaped. The at least one latching nose is formed by a narrow region of the plate-shaped holding section of the release and holding spring.Proceeding from this, it is an object of the present invention to provide an improved spring force clamping connection and a conductor connection terminal having such a spring force clamping connection.The object is achieved with the spring force terminal having the features of claim 1 and the conductor terminal having the features of claim 15. Advantageous embodiments are described in the dependent claims.It is proposed that the spring force clamping connection has an hold-open element with a spring-elastic latching arm having a latching contour, which is positioned laterally next to the side edge of the clamping leg in a hold-open position, in which the clamping leg is deflected towards the contact leg counter to the spring force. The latching arm of the hold-open element is designed for latching the clamping leg, which is deflected towards the contact leg in the hold-open position counter to the spring force of the clamping spring, to the latching contour. The hold-open element has a release section which is designed to be deflected by an electrical conductor which is inserted to be clamped onto the busbar and thereby to displace the elastically resilient latching arm away from the side edge edge of the clamping limb and to unlatch the clamping limb which is latched to the latching contour in the hold-open position.This provides a lateral latching on the side edge of the clamping leg. The lateral space is used for the latching movement. This allows new designs which are compact and simple in construction. The latching movement for disengaging the clamping leg from the hold-open position takes place away from the side edge of the clamping leg, i.e. in the width direction of the clamping leg and transversely to the direction of extent of the clamping leg running from the spring arch to the clamping edge. The movement of the spring-elastic latching arm for latching and de-latching thus takes place transversely to the direction of extent of the clamping limb.The locking in the sense of the present invention comprises a positive connection by a stop for the clamping leg provided with the locking contour. For this purpose, the latching contour of the latching arm can form a stop for one of the side edge edges of the clamping leg.The latching arm can be moved with its latching contour elastically in the width direction of the clamping leg away from the side edge of the clamping leg. This results in a lateral deflection of the latching arm for unlocking and latching, wherein the lateral space is used for the latching movement. This allows a compact construction outside the actuation and conductor insertion region.The release portion can be formed integrally with the hold-open element or can be formed on a separate release part interacting with the hold-open element.If the elastically resilient release region is formed integrally, i.e. integrally with the resilient latching arm, for example as a bent free end (socket), only one stamped and bent part is required. This reduces the material requirement and the manufacturing and assembly effort.The hold-open element can, however, also be multi-part, wherein the release region is realized by a further release part. Although this requires several stamped and bent parts which have to be manufactured and assembled, it may nevertheless be expedient under certain circumstances for manufacturing reasons and for more stable fastening.The elastically resilient release section can be formed integrally with the elastically resilient latching arm in that the release section is bent out of the latching plane of the latching arm having the latching contour and forms a bearing surface for the free end of an inserted conductor to be clamped below the latching plane in the conductor insertion direction.A free end within the meaning of the present invention is an emerging end, at which the element ends without a further part adjoining.The latching plane and the bearing plane of the bearing surface can be arranged at a distance from one another and parallel to one another. The release section can be designed, for example, as an S- or U-shaped bent sheet metal element.The hold-open member may have a fixing portion fixed to the bus bar. The spring-elastic latching arm can extend from the fastening section at a distance from the busbar parallel to the plane of the busbar spanned there.In this case, an extension at a distance from the busbar parallel to the plane of the busbar spanned there is to be understood in the sense of quasi-parallel, wherein exact parallelism is not important. The direction of extension can be from the contact limb in the direction of movement of the free end of the clamping limb (for example with its clamping edge) from the open position into the clamping position or opposite thereto.The busbar can have a conductor feedthrough opening, wherein the clamping spring projects with the clamping leg and the contact leg into the conductor feedthrough opening. The hold-open member has a fixing portion fixed to the conductor through hole. The spring-elastic latching arm extends from the fastening section at a distance from the busbar parallel to the plane spanned by the conductor feedthrough opening.Again, the term "parallel" is to be understood in the sense of quasi-parallel, wherein an exact parallelism and the direction of the extension toward the clamping edge or opposite thereto are not important.The conductor feedthrough opening can have a collar which extends away from the plane of the busbar spanned by the conductor feedthrough opening in a conductor insertion direction and partially or completely delimits the conductor feedthrough opening and has two collar longitudinal side walls which are spaced apart from one another and are opposite one another. The fastening section of the hold-open element can have two flank walls spaced apart from one another, which are connected to one another via a front-side root region and bear against the collar longitudinal side walls. The flank walls can be fixed to the collar in a force-fitting manner by a spring force applied by the root region.In the embodiment of the busbar with conductor passage opening, the latter can thus be partially or completely delimited on the underside opposite the spring arch by a collar. Two opposing fastening flanks can have the latching arms and can be attached to the collar from one side in a form-fitting and force-fitting manner as clamping tongs. The collar can thus be used for fastening the hold-open element. The release spring can be mounted as separate clamping tongs on the other side on the collar and can thus be connected in a form-fitting and force-fitting manner. The release spring can, however, also be formed by the extended contact leg or can be clamped between the contact leg and the busbar.The elastically resilient latching arm can have a release contour. The release section formed integrally with the elastically resilient latching arm can be guided past the elastically resilient latching arm adjacent to the release contour and can be bent out of the latching plane of the latching arm having the latching contour and form a bearing surface for the free end of an inserted conductor to be clamped in the conductor insertion direction below the latching plane. The release section can be designed for lateral deflection of the latching arm by acting on the release contour when the bearing surface is displaced away from the busbar by an inserted electrical conductor.In this case, the release section can extend away from an optional fastening section of the hold-open element, at which the latter is fastened to the busbar. The latching arm can be connected to the fastening section on the same side as the release section. However, it is also conceivable for the latching arm to be connected to the fastening section on the opposite side as the release section.A lateral deflection in the sense of the present invention comprises a movement transversely to the conductor insertion direction in the width direction of the clamping leg away from the side edge of the clamping leg.The release contour and / or latching contour can be, for example, a projection projecting from the latching arm, e.g. a nose or an elevation. The protrusion may have an inclined (oblique) surface. The inclination can be increasing in the pivoting direction of the clamping limb from the clamping position toward the open position. As a result, the height of the protrusion increases in this direction. This can apply both to the latching contour and to the triggering contour.The release section can be guided between the latching contour and the release contour past the elastically resilient latching arm.Thus, the release section can adjoin a fastening section with an elastically resilient region and can be guided past the latching arm with this region or a more rigid release region adjoining it. The hold-open element is connected to the busbar at the fastening portion.The release section can have a support surface (i.e. release surface) for the free end of an inserted conductor to be clamped, which support surface is formed reinforced by a bead contour or rib structure, for example. This ensures that the insertion force exerted on the trip section with the inserted electrical conductor does not deform the bearing surface. Rather, the insertion force is converted for deflecting the adjoining region of the release section.The release portion may have an elastically resilient portion spaced from the stiffened support surface. This elastically resilient section is preferably located in the transition from the fastening section to the release region interacting with the release contour.Spacer tongues can extend from the fastening portion of the hold-open element towards the busbar. A distance between the hold-open element and the underside of the busbar can thus be adjusted by the spacer tongues. The spacer tongues thus make it possible structurally to adapt a variant of an hold-open element to different busbars at the factory. For this purpose, spacer tongues of different lengths can be provided, depending on requirements. However, it is also conceivable that, in the same stamped part, the bending angle of the spacer tongues and thus the effective length is changed.The hold-open element may have two mutually opposite side walls, bottom portions projecting towards one another from the side walls and an end wall extending between the side walls transversely with respect to the side walls and the bottom portions. Furthermore, a base plate separate from the side walls with their base portions and end wall can be provided. This base plate can be arranged between the side walls, mounted on the base portions and fixed to the side walls by bearing projections. The base plate forms the triggering section and is mounted on the end wall of the hold-open element with a bearing region bent towards the busbar. The contact leg is connected to the hold-open element. The hold-open element is mounted on the busbar in a spring-elastic manner. The latching contour is formed on one of the side walls, which forms the elastically resilient latching arm.This creates a cage, which is held movably by the contact limb and has lateral latching noses.The hold-open element may have two latching arms which are arranged at a distance from one another and are opposite one another. The two latching arms each have latching contours for latching a side edge of the clamping limb.In a generic conductor connection terminal having an insulating material housing and a spring force clamping connection according to the invention, the insulating material housing can have a conductor insertion opening for inserting an electrical conductor to a clamping point formed between a busbar clamping section of the busbar and the clamping edge of the clamping limb, in order to clamp the inserted electrical conductor between the busbar clamping section and the clamping point. The conductor insertion opening leads out toward the clamping point and is oriented such that an electrical conductor inserted into the conductor insertion opening comes into contact with the release section and displaces the elastically resilient latching arm by displacing the release section in order to unlatch the clamping leg latched on the latching contour in the hold-open position.The insulating material housing can have an actuating opening which is open toward the clamping limb in order to displace the clamping limb in the direction of the contact limb into the hold-open position counter to the spring force of the clamping spring by means of an actuating tool which is inserted into the actuating opening or an actuating element which is installed movably into the actuating opening.In the context of this application, the words "a / an" are not to be understood as a numerical word unless expressly defined otherwise, but rather as an indeterminate article having the word sense of "at least one / one". Features with the specification "exactly one / one" can, on the other hand, explicitly relate to "one / one" as a number word.The invention is explained in more detail below by way of example with reference to exemplary embodiments. The following are shown: FIG. 1 is a perspective view of a conductor terminal with a first embodiment of a spring force terminal; FIG. 2 is a plan view of the conductor connection terminal; FIG. 3 is a side sectional view of the first embodiment of a spring force clamping terminal; FIG. 4 is a perspective side sectional view of the spring force clamping terminal of FIG. 3 ; FIG. 5 shows a side view of the hold-open element from FIGS. 3 and 4 ; FIG. 6 is a perspective top view of the hold-open element of FIGS. 3 to 5; FIG. 7 is a top view of the hold-open element from FIG. 6 ; FIG. 8 is a side partial sectional view of the lead terminal of FIG. 1; FIG. 9 is a perspective view of a conductor terminal with a second embodiment of a spring force terminal; FIG. 10 is a side sectional view of the second embodiment of a spring force clamping terminal; FIG. 11 is a side perspective sectional view of the spring force clamping terminal of FIG. 10 ; FIG. 12 is a side view of the spring force clamping connection from FIGS. 10 and 11 ; FIG. 13 is a perspective front view of the hold-open element of FIGS. 10 to 12 ; FIG. 14 is a plan view of the spring force clamping connection from FIG. 13 ; FIG. 15 is a side partial sectional view of the lead terminal of FIG. 9; FIG. 16 is a perspective view of a conductor terminal with a third embodiment of a spring force terminal; FIG. 17 is a side sectional view of the third embodiment of a spring force clamping terminal; FIG. 18 is a side perspective sectional view of the spring force clamping terminal of FIG. 17 ; FIG. 19 is a side view of the spring force clamping connection from FIGS. 17 and 18 ; FIG. 20 is a front view of the spring force clamping connection of FIGS. 17 to 19; FIG. 21 is a plan view of the spring force clamping connection from FIG. 20 ; FIG. 22 is a perspective front view of the spring force clamping connection of FIGS. 17 to 21 in the hold-open position; FIG. 23 is a side partial sectional view of the lead terminal of FIG. 16; FIG. 24 is a perspective view of a conductor terminal with a fourth embodiment of a spring force terminal; FIG. 25 is a side sectional view of the fourth embodiment of a spring force clamping terminal; FIG. 26 shows a perspective sectional side view of the conductor connection terminal from FIG. 24 with spring force terminal in the closed starting position; FIG. 27 shows a perspective sectional side view of the conductor connection terminal from FIG. 24 with spring force terminal in the hold-open position; FIG. 28 shows a perspective side sectional view of the conductor connection terminal from FIG. 27 with the spring force terminal connection unlocked in the closed clamping position; FIG. 29 is a perspective top view of the hold-open element of the fourth embodiment of the spring force clamping connection from FIG. 25 ; FIG. 30 is a plan view of the hold-open element for the spring force clamping connection from FIG. 29 ; FIG. 31 is a cross-sectional view of a top view of the conductor terminal from FIG. 27 with spring force terminal in the open position; FIG. 32 is a side view of the hold-open element for the spring force clamping connection from FIG. 29 ; FIG. 33 is a front view of the hold-open element for the spring force clamping connection from FIG. 29 ; FIG. 34 is a front view of the fourth embodiment of the spring force clamping terminal from FIG. 29 ; FIG. 35 shows a perspective view of the fourth embodiment of the spring force clamping connection in the closed starting position; FIG. 36 is a perspective view of the fourth embodiment of the spring force terminal with the electric conductor inserted; FIG. 37 is a side view of the fourth embodiment of the spring force clamping connection in the closed starting position with the actuating pusher; FIG. 38 is a side sectional view of the fourth embodiment of the spring force clamping connection in the latched hold-open position with actuating pusher.FIG. 1 shows a perspective view of a conductor connection terminal 1 with an insulating material housing 2 and a first embodiment of a spring force terminal 3.The conductor terminal 1 has an insulating housing 2 having a conductor insertion opening 4. In the exemplary embodiment shown, two spring force clamping connections 3 are formed with respective clamping springs 6 on a common busbar 5. In this case, a respective conductor insertion opening 4 leads to an associated spring force clamping connection 3.It is clear that, in addition to a conductor insertion opening 4, an actuating opening 8 is present in the insulating material housing 2. This actuating opening 8 opens out toward an actuating surface on a clamping leg 9 of the clamping spring 6. By inserting an actuating tool or with an actuating element installed in the actuating opening 8, a force can be exerted on the clamping limb 9 in order to displace the latter into the hold-open position toward the contact limb 10.The hold-open element 7 has a latching arm 11 with a latching contour 12 which forms a stop for the free end of the clamping limb 9 pivoted towards the contact limb 10 in the hold-open position. The clamping leg 9 is thus locked in the hold-open position.In the hold-open position, an electrical conductor can be led past the opened clamping limb 9. In alignment with the conductor insertion opening 4, a release portion 13 of the hold-open element 7 is positioned. An inserted electrical conductor strikes the release section 13 and exerts a force in the conductor insertion direction L, by means of which the latching arm 11 is moved laterally away from the clamping limb 9 with its latching contour 12. The locking of the clamping leg 9 on the latching contour 12 can thus be canceled, so that the clamping leg 9 pivots from the contact leg 10 into the closed clamping position by the force of the clamping spring 6.In the exemplary embodiment shown, the conductor connection terminal 1 is designed as a terminal block with a latching foot 14 for latching onto a support rail. A jumper opening 15 can be present in the insulating material housing 2, which leads to a jumper contact 16 on the busbar 5. A transverse bridge electrically conductively connecting a plurality of terminal blocks or a connection contact of an electronics module can thus be placed on the insulating material housing 3 and electrically conductively connected to the busbar 5.However, this is only exemplary. For the conductor connection terminal 1, the conductor insertion opening 4 in the insulating material housing 2 is essentially important, which is aligned with the spring force clamping connection 3 in order to plug an electrical conductor into the conductor insertion opening 4 and to clamp it to the spring force clamping connection 3.FIG. 2 shows a plan view of the conductor connection terminal 1 from FIG. 1. The conductor insertion openings 4 arranged at a distance from one another and the respective actuating openings 8 lying next to one another can be seen.FIG. 3 shows a side sectional view of the first embodiment of a spring force clamping connection 3.The clamping spring has a contact leg 10, a clamping leg 9 with a clamping edge 17 at its free end and a spring bow 18 which connects the clamping leg 9 to the contact leg 10.The busbar 5 has a conductor passage opening 19 with a collar 20 which delimits the conductor passage opening 19. For this purpose, the collar walls protrude in the conductor insertion direction L on the underside of the busbar 5, which lies opposite the spring arch 18 of the clamping spring 6. The collar 20 thus forms a channel for receiving and guiding an inserted electrical conductor.The contact leg 10 abuts a first collar end side wall 21. On the opposite side of the abutment leg 10 is a second collar end side wall 22 which is inclined towards the first collar end side wall 21 and provides a clamping portion 23 to which an electrical conductor is clamped. The clamping section 23, together with the clamping edge 17 on the clamping leg 9 of the clamping spring 6, forms a clamping point for clamping an electrical conductor. The first collar end side wall 21 is connected to the second collar end side wall 22 by collar longitudinal side walls 24. In the embodiment of an only partially enclosed collar 20, only one collar longitudinal side wall 24 is present. In a completely enclosed collar 20, two parallel and spaced-apart collar longitudinal side walls 24 are provided.The hold-open element 7 is placed on the collar 20 in a form-fitting and force-fitting manner. It has a fastening section 25 which is fixed to the collar 20 and from which a spring-elastic latching arm 11 extends at a distance from the busbar 5 parallel to the plane spanned by the conductor feedthrough opening 19. The latching arm 11 has a latching contour 12 in the form of a material tab bent out of the sheet metal material of the latching arm 11 toward the clamping limb 9. When the clamping leg 9, as shown, is pivoted toward the contact leg 10 into the hold-open position, the free end of the clamping leg 9 is located behind the latching contour 12, which forms a stop for the clamping leg 9 and latches the latter in the hold-open position.The hold-open element 7 also has a release section 13 which is formed as an elastically resilient release arm integrally, i.e. integrally with the fastening section 25. The trip portion 13 extends downward from the fixing portion 25 in the conductor insertion direction L away from the bus bar 5. It has a spring arm 26 curved in an S-shape, which is guided past the latching arm 11 laterally between the latching contour 12 and a release contour 27 protruding from the plane of the latching arm 11 toward the release section 13. After bending underneath the latching arm 11, the release section 13 terminates in a release surface 28 which is arranged transversely to the conductor insertion direction L in alignment with the conductor passage opening 19 with its adjoining collar 20. An electrical conductor inserted for clamping to the clamping point of the spring force clamping connection 3 formed by the clamping edge 17 and the clamping section 23 thus impinges on the release surface 28 in order to exert a release force acting in the conductor insertion direction L on the release surface 28. The release section 13, in particular the S-shaped curved spring arm 26, is thus displaced towards the release contour 27 and the latching arm 11 is moved laterally away from the clamping limb 9 by the spring arm 26 coming into contact with the release contour 27 presented.FIG. 4 is a side cross-sectional perspective view of the spring force clamping terminal 3 of FIG. 3.It can be seen that the release surface 28 is preferably designed to be reinforced, for example with bead contours or rib contours. For this purpose, laterally bent marginal edges 29 of the sheet metal strip can be provided and / or beads introduced into the plane of the sheet metal strip and / or protruding ribs can be formed on the sheet metal strip. The deformation or displacement of the triggering section 13 when the triggering force of the electrical conductor acts on the triggering surface 28 is thus concentrated on the elastically resilient region of the spring arm 26 located between the triggering surface 28 and the connection to the fastening section 25.It can be seen that the elastically resilient latching arm 11 is arranged below the collar 20 in the conductor insertion direction L and extends in the longitudinal direction of the conductor passage opening 19 along the collar longitudinal side wall 24 from the direction of the second collar end side wall 22 toward the opposite first collar end side wall 21. The free end of the latching arm 11 arranged adjacent to the first collar end side wall 21 with the contact limb 10 is movable, so that the latching arm 11 can spring out laterally, i.e. transversely to the conductor insertion direction L, away from the side edge of the clamping limb 9. The latching arm 11 is firmly connected to the fastening portion 25 adjacent to the second end side wall 22 with the clamping portion 23 and is fixed there to the collar 20.The clamping leg 9 can be narrower with its section that dips into the conductor passage opening 19 than the section of the clamping leg 9 that adjoins the spring bend 18.It is clear that the latching contour 12 has a material tab which is obliquely raised out of the plane of the latching arm 11 and forms a stop for the free end of the clamping limb 9 and latches the latter in the hold-open position.It can also be seen that the latching arm 11 has a release contour 27 which is bent out of the plane of the latching arm 11 into alignment with the conductor passage opening 19 and which, when viewed from the direction of the second end side wall 22 in the hold-open position, lies behind the clamping limb 9 and the spring arm 26 which is curved in an S-shape. The free end of the clamping leg 9 and the release section 13 are thus guided laterally past the latching arm 11 between the latching contour 12 and the release contour 27. They can preferably rest with their side edge edges against the latching arm 11.If an actuating force is now exerted on the release surface 28 in the conductor insertion direction L by an inserted electrical conductor, the release section 13 pivots (in the counter-clockwise view) and the spring arm 26 bearing on the latching arm 11 moves in the direction of the plane spanned by the first collar end wall 21. In this case, the spring arm 26 displaces the release contour 27 running obliquely behind the spring arm 26 and pivots the latching arm laterally outwards. As a result, the latching contour 12 is displaced laterally, i.e. transversely to the conductor insertion direction L and transversely to the collar longitudinal side wall 24, outwards in order to cancel the stop for the clamping leg 9. The free end of the clamping leg 9 is thereby unlatched and the clamping leg 9 can pivot out of the hold-open position into the closed starting position or closed clamping position by the spring force of the clamping spring 6.FIG. 5 shows a side view of the hold-open element 7 from FIGS. 3 and 4. it can be seen that the fastening section 25 is formed from a sheet metal part section which is bent in a U-shape and has an end-side root region 30 and two flank walls 31 which project therefrom (horizontally) and are spaced apart from one another. The S-shaped bent spring arm 26 is integrally connected to the root portion 30 and extends downward from the root portion 30. On the free end of the flank walls 31 which are opposite the root region 30, the flank walls 31 are freely movable in order to fix the hold-open element to the collar 20 in a form-fitting and force-fitting manner by the spring elasticity. Connected to the free ends of the flank walls 31 is a respective latching arm 11 which extends below the flank walls 31 parallel to the lower front edge of the adjoining flank wall 31 in the direction of the spring arm 26 bent in an S-shape. The spring arm 26 is accommodated between the two flank walls 31 and abuts laterally on the inner walls of the latching arms 11 facing each other between the latching contour 12 and the release contour 27.It can be seen that the release contour 27 present at the free end of the latching arm 11 is a portion which is raised obliquely or curved, for example, from the plane of the latching arm 11 with respect to the opposite latching arm 11.At the upper edge of the flank walls 31 spacer tongues 32 project.FIG. 6 shows a perspective top view of the hold-open element 7 of FIGS. 3 to 5. This forms a U-shaped cage, from which the two latching arms 11 are pointed towards one another. The latching arms 11 each have latching contours 12 which point toward one another and are set obliquely in the form of material flaps and a curved and / or curved free end on which triggering contours 27 which point toward one another are formed. These are arranged behind the S-shaped spring arm 26 in the transition to the widened release surface 28 adjoining under the latching arms 11 and reinforced laterally by marginal edges 29. The side edges of the release portion 13 arranged laterally next to the latching arms 11 urge the latching tabs 11 laterally apart when the release portion 13 is displaced in the direction of the root region 30.FIG. 7 shows a plan view of the hold-open element 7 from FIG. 6, it being made more clear that the release section 13 bears laterally on the latching arms 11 in the region of the release contour 27. The elastically resilient latching arms 11 are thus pivoted away from one another and toward the planes of the flank walls 31 when the release section 13 is displaced between the release contours 27 which are bent in a manner facing one another.FIG. 8 is a side partial sectional view of the lead terminal of FIG. 1.It is clear that the conductor insertion opening 4 extends with its boundary walls in the insulating material housing 2 in an alignment, indicated by the dashed line, into the interior towards the associated spring force clamping connection 3, so that an inserted electrical conductor strikes the reinforced release surface 28 of the release section 13 with its end. This triggering force displaces the elastically resilient spring arm 26 curved in an S-shape, and in the process the elastically resilient latching arm 11 is pivoted laterally outwards by displacement of the adjoining triggering contour 27, in order to cancel the stop of the latching contour 12 for the clamping leg 9.It can also be seen that the hold-open element 7 is held at a distance from the underside of the busbar 5 by the spacer tongues 32 projecting from the upper edge of the flank walls 31 when the hold-open element 7 is fastened to the collar 20.FIG. 9 shows a perspective view of a conductor connection terminal 1 with a second embodiment of a spring force clamping connection 3. The construction of the insulating housing 2 with its conductor insertion openings 4, the busbar 5 and the clamping spring 6 is comparable to the first exemplary embodiment, so that reference is made to the above description.The holding-open element 7 is in turn plugged with a fastening section 25 onto a collar 20 on the underside of the busbar 5 which surrounds the conductor passage opening 19.Below the fastening section 25 there are again elastically resilient latching arms 11 which have latching contours 12 pointing towards one another and inclined toward the clamping limb 9. In the second exemplary embodiment, the latching arms 11 are integrally formed on the root region 30 of the fastening section 25. The root region 30 is drawn further downward from the plane of the flank walls 31 and thus also forms a root region for the two mutually spaced-apart latching arms 11.FIG. 10 shows a side sectional view of the second embodiment of a spring force clamping terminal 3.The release section 13 in turn has an S-shaped curved spring arm 26 which is connected to the root region 30 and is guided laterally alongside the latching arm 11. It merges into a curved release surface 28 which is reinforced, for example, by marginal edges 29 as shown and / or by beads and the like. The release surface 28 is positioned in alignment with the collar 20, so that an electrical conductor inserted through the conductor passage opening 19 and the collar 20 inevitably impinges on the release surface 28 and exerts a release force. The release section 13 is thus displaced such that the release section 13 engages with a release contour 27 of the latching arm 11 and thus swivels the latching arm 11 laterally away from the side edge of the clamping leg 9.FIG. 11 shows a perspective side sectional view of the spring force clamping connection 3 from FIG. 10, and it can be seen that the clamping limb 9 is latched on the latching contour 12 of the latching arm 11 in the hold-open position. The free end of the clamping leg 9, at which the clamping edge 17 is formed on the lower front edge, lies in front of the spring arm 26. In the hold-open position, the freely movable end of the clamping leg 9 and the section of the spring arm 26 lying behind it are located between the latching contour 12 and the release contour 27.FIG. 12 shows a side view of the spring force clamping connection 3 from FIGS. 10 and 11, and it becomes clear that both the flank walls 31 and the latching arms 11 project from a common root region 30 in the same direction and have freely movable ends opposite the root region 30, which ends are not adjoined by any further part.The latching arms 11 are shorter than the adjacent flank walls 31, and are oriented parallel to the respectively adjacent flank wall 31 and pivotable laterally out of the plane of the flank wall 31, i.e. transversely to the conductor insertion direction and away from the side edge of the release section 13.On the latching arms 11, the latching contour 12 and the triggering contour 27 are formed on the side adjoining the triggering section 13.FIG. 13 shows a perspective front view of the hold-open element 7 of FIGS. 10 to 12, it being evident that the fastening section 25 is formed from two flank walls 31 spaced apart from one another and a root region 30 which connects these flank walls 31 at the end face. Further, a pair of latching arms 11 project from the root portion 30 below the flank walls 31. A U-shaped cage is thus formed.The latching arms 11 are pointed out facing each other from the plane of the respectively adjoining flank wall 31. The latching arms 11 each have latching contours 12 which point towards one another and are set obliquely in the form of material flaps and a curved free end. On the release section 13, release contours 27 pointing towards one another are formed adjacent to the latching contours 12 in the vicinity of the root region 30 of the latching arms 11. These are arranged behind the S-shaped spring arm 26 in the transition to the widened release surface 28 adjoining under the latching arms 11 and reinforced laterally by marginal edges 29. The side edges of the release portion 13 arranged laterally next to the latching arms 11 urge the latching arms 11 laterally apart when the release portion 13 is displaced in the direction of the root region 30.FIG. 14 shows a plan view of the hold-open element 7 from FIG. 13, the release section 13 bears laterally on the latching arms 11 in the region of the release contour 27. The elastically resilient latching arms 11 are thus pivoted away from each other and towards the plane of the flank walls 31 when the release section 13 is displaced into the intermediate space between the release contours 27 which are bent facing each other. The latching contours 12 are displaced away from one another in order to cancel the stop for the clamping limb 9.FIG. 15 is a side partial sectional view of the lead terminal 1 of FIG. 9.The conductor insertion opening 4 is formed by boundary walls in the insulating material housing 2. It extends into the interior space to the associated spring force clamping connection 3 in an alignment indicated by the dashed line, so that an inserted electrical conductor strikes the reinforced release surface 28 of the release section 13 with its end. The release section 13 is displaced by this release force and the adjacent elastically resilient latching arms 11 are pivoted laterally outwards by engagement with the adjacent release contour 27 in order to cancel the stop of the latching contour 12 for the clamping limb 9.The hold-open element 7 is fastened to the collar 20. In this case, the spacing tongues 32 projecting from the upper edge of the flank walls 31 define a spacing from the underside of the busbar 5. The spacing tongues 23 can be adjusted, for example, by their length or angle to the desired spacing from the respective busbar 5. A standard hold-open element 7 can thus be used for different variants of busbars 5.FIG. 16 shows a perspective view of a conductor connection terminal 1 with a third embodiment of a spring force clamping connection 3.The construction of the insulating housing 1 with the busbar 5 and the clamping springs 6 installed therein is comparable to the embodiments described above. Therefore, for the basic principles, reference can be made to the above.The hold-open element 7 is not fixed to the collar 20 in this exemplary embodiment. It has two mutually opposite side walls 33 and an end wall 34 connecting the side walls to one another. The hold-open element 7 is connected to an extension of the contact limb 10, in that this extension of the contact limb 10 is fastened positively to the side walls 33 by bearing projections 35. The trailing end of the extension of the contact leg 10 provides a base plate 36 of the hold-open element 7 and forms a release surface 28. the base plate 36 is transversely aligned with the conductor insertion opening 4, i.e. a delimiting base is formed for an electrical conductor inserted into the conductor insertion opening 4 and passed through the conductor passage opening 19 and the collar 20. In this case, the base plate 36, together with the side walls 33 and the end wall 34 or the extension of the bearing limb 10 abutting thereon, form a conductor collecting pocket in which a stripped end of an electrical conductor to be clamped is accommodated.It can be seen that latching contours 12 pointing towards the clamping limb 9 are arranged at the upper corner regions of the side walls 12. These are designed as material flaps bent out of the plane of the respective side wall 12 and toward the opposite side wall 12.FIG. 17 is a side sectional view of the third embodiment of a spring force clamping terminal 3.It can be seen that the contact leg 10 bears against the first collar side wall 21 of the collar 20 enclosing the conductor passage opening 19 and passes through the collar 20. The extension of the contact leg 10 abuts the end wall 34 of the hold-open element 7 and, after bending, forms the base plate 36, which simultaneously provides the release surface 28. An electrical conductor inserted through the collar 20 thus impinges on the release surface 28 standing transversely thereto and thereby exerts a release force which pivots the release section 13.The release section 13 formed from the extension of the contact limb 10 is fixed positively to the side walls 33 by bearing projections 35 which project laterally from the side walls 33. At the lower edge of the side walls 33, bottom sections 37 in the form of material flaps are bent, on which the release section 13 is mounted. The extension of the contact limb 10, i.e. the release section 13, is thus fixed in a positive-locking manner in the region of the release surface 28 between the base sections 37 and adjacent bearing projections 35. In the region of the end wall 34, the end wall 34 together with adjacent bearing projections 35 forms a positive fit for the vertical section of the release section 13.The hold-open element 7 is mounted in this way in an elastically resilient manner on the contact limb 10 of the clamping spring 6.It can be seen that the elastically resilient latching arm 11 is arranged below the collar 20 in the conductor insertion direction L and forms a conductor collecting pocket below the conductor passage opening 19 and the collar 20.The clamping leg 9 can be narrower with its section that dips into the conductor passage opening 19 than the section of the clamping leg 9 that adjoins the spring bend 18.It is clear that the latching contour 12 has, on at least one of the side walls 33, a material tab which is set out obliquely from the plane of the latching arm 11 and forms a stop for the free end of the clamping limb 9 and latches the latter in the hold-open position.If an actuating force is now exerted on the release surface 28 in the conductor insertion direction L by an inserted electrical conductor, the release section 13 pivots (in the counterclockwise view) and the latching contour 12 moves downward away from the busbar 5. As a result, the stop for the clamping leg 9 formed by the latching contour 12 is canceled and the free end of the clamping leg 9 is unlocked. The clamping leg 9 can then pivot out of the hold-open position by the spring force of the clamping spring 6 into the closed starting position or closed clamping position.FIG. 18 shows a perspective side sectional view of the spring force clamping connection 3 from FIG. 17, and it becomes clear that the free end of the clamping leg 9 is latched in the hold-open position on the latching contour 12 protruding from the side wall 33. It can also be seen that the bearing projections 35 are designed as material tabs bent out from the plane of the side wall 33 pointing toward the clamping spring 6. The cage formed from the two side walls 33 and the end wall 34 connecting the side walls 33 is thus fixed in a positive-locking manner to the release section 13, which is formed from the extension of the contact limb 10.FIG. 19 shows a side view of the spring force clamping connection 3 without the busbar 5 from FIGS. 17 and 18 The clamping spring 6 is suspended in the cage formed by the side walls 33 and the end wall 34 in the hold-open position. It is clear that the cage is positively fixed on the extension of the contact limb 10, i.e. the release section 13. In this case, a material tab 38 is bent away from the release section 13, which material tab exchanges through an opening in the end wall 34 and provides an additional form-fit connection between the release section 13 and the end wall 34.It can also be seen that the free end of the clamping leg 9 is latched to the latching contour 12 of the side walls 33.FIG. 20 shows a front view of the spring force clamping connection 3 of FIGS. 17 to 19.It can be seen that two side walls 33 are arranged at a distance from one another and parallel to one another, wherein the side walls 33 are connected to an end wall 34 to form a U-shaped cage. This cage is formed from a stamped and bent sheet metal part. From the side walls 33, at the lower edge bottom portions 37 are bent in a direction facing each other. Bearing projections 35 are cut free from the inner surface and are directed obliquely toward one another into the interior of the cage. Furthermore, at the upper front corner regions of the two side walls 33, material tabs are bent out facing each other to form a latching contour 12.It can also be seen that a material tab 38 is exposed from the release section 13, which is formed from the extension of the contact limb 10, which tab is bent out to the rear away from the clamping limbs 9. It dips into an opening of the end wall 34 in order to connect the clamping spring 6 there to the cage in a form-fitting manner.FIG. 21 shows a plan view of the spring force clamping connection 3 from FIG. 20.It is clear that the latching contours 12 bent out facing each other from the inside of the side walls 33 toward the clamping spring 6 reduce the intermediate space in order to thus form a stop for the clamping leg 9 received between the side walls 33. This is thus latched and held in the hold-open position.It is also clear that the release surface 28 protruding from the intermediate space of the side walls 33 forms a base plate 36 which blocks the path for a release surface 28 in the conductor insertion direction L (in the view in the viewing direction perpendicular to the release surface 28). An electrical conductor to be clamped thus strikes the release surface 28 and applies a force to displace the latching contours 12 in the conductor insertion direction L in order to cancel the stop for the clamping leg 9.FIG. 22 shows a perspective front view of the spring force clamping connection of FIGS. 17 to 21 in the hold-open position.It can be seen that the intermediate space between the latching contours 12 which are pointed towards one another is smaller than the width of the free end of the clamping limb 9. This forms a stop for the clamping leg 9 pivoted towards the contact leg 10 in the hold-open position.It is also clear that the release section 13 is fixed in a positive-locking manner to the U-shaped cage by means of the bearing projections 35 and the base sections 37 or the end wall 34.FIG. 23 is a side partial sectional view of the lead terminal 1 of FIG. 16.The conductor insertion opening 4 formed by boundary walls in the insulating material housing 2 extends into the interior space to the associated spring force terminal 3 in an alignment indicated by the dashed line. An inserted electrical conductor can thus strike the reinforced release surface 28 of the release section 13 with its end. The triggering portion 13 is displaced by this triggering force. In this case, the hold-open element 7 which is resiliently connected to the contact limb 10 is pivoted downward in the conductor insertion direction L by engagement with the adjacent release surface 28, in order to cancel the stop of the latching contour 12 for the clamping limb 9. The latching contour 12 is formed on the side walls 33 positioned laterally next to the side edge edges of the clamping leg 9, which side walls together with the end wall 34 form a cage connected in a form-fitting manner to the release section 13.The hold-open element 7 is movably fastened in this way to the contact limb 10 of the clamping spring 6 behind the bearing of the contact limb 10 on the first end side wall 21 of the collar 20.FIG. 24 shows a perspective view of a conductor connection terminal 1 with a fourth embodiment of a spring force clamping connection 3. An electrical conductor 39 is shown here, which is inserted into the conductor insertion opening 4.It can also be seen that an actuating presser 40 is slidably installed in the actuating opening 8 which is disposed adjacent to the conductor insertion opening 4.The busbar 5 in turn has a conductor passage opening 19 with a collar 20 adjoining the underside of the busbar 5 in the conductor insertion direction L. This forms a channel for the passage of the stripped end of the electrical conductor 39.An hold-open element 7 is fastened to the collar 20. The hold-open element 7 is formed from a bent sheet metal strip which has a fastening portion 25 which bears with clamping webs against the outer sides of the collar longitudinal side walls 24 of the collar 20. From the horizontal fastening section 25 arranged parallel and adjacent to the plane of the busbar 5 projects a latching arm 11 with a vertical spring arm section 41 and a horizontal latching section 42 extending therefrom parallel to the fastening section 25. The latching section 42 is formed from two mutually opposite webs, on the inner edges of which mutually facing latching contours 12 are formed. These can be designed as conically tapering ramps, the latching contours 12 protruding further in the direction of the contact limb 10 than on the side facing the spring arm section 41. Thus, the clamping leg 9 can urge the webs of the latching section 42 apart when pivoting into the hold-open position towards the contact leg 10, in order to overcome the stop formed by the latching contours 12. However, it is also conceivable for the latching section 42 to move downward away from the plane of the busbar in order in this way to release the path otherwise blocked by the latching contours 12 for the clamping limb 9.The latching section 42 is adjoined by a release section 13 having a section 43 which is bent away from the latching section 42 and extends vertically away from the busbar plane and a release surface 28 which extends therefrom transversely with respect to the conductor insertion direction L and parallel to the busbar plane. An electrical conductor 39 inserted through the conductor insertion opening 4 and the conductor passage opening 19 with its collar 20 strikes the aligned release surface 28 and strikes the release section 13 via a release force in the conductor insertion direction L. The latching section 42 is thus displaced downward away from the busbar plane, so that the latching contours 12 are displaced downward. A stop formed by the latching contours 12 for the free end of the clamping leg 9 is thus raised.FIG. 25 is a side sectional view of the fourth embodiment of a spring force terminal 3. the bus bar 5 has a lead-through hole 19 defined by a collar 20 at the bottom. The collar 20 is formed from two collar end side walls 21, 22 lying opposite one another and at least one collar longitudinal side wall 24. The contact leg 10 of the clamping spring 6, which is bent in a U-shaped manner in the manner of a leg spring, abuts the first collar end side wall 21. The opposite clamping leg 9 is connected to the contact leg 10 via a spring bend 18 and, in the closed starting position, rests with its free end or the clamping edge 17 at the free end on the second collar end side wall 22 which is flared obliquely to the first collar end side wall 21.The fastening portion 25 is guided along the outer side of the collar longitudinal side wall 24 in order to fasten the hold-open element to the collar 20 in a form-fit and force-fit manner. In this case, an optional holding tab 44 can additionally be extended from the spring arm section 41 toward the collar 20 in order to additionally clamp the hold-open element 7 to the collar 20.It can be seen that the release surface 28 is arranged in alignment below the feed-through channel formed by the collar 20 in order to form a base plate there which is transverse to the conductor insertion direction L and on which an electrical conductor impinges.The hold-open element 7 is formed from a sheet metal strip bent in an S-shaped manner in the manner of a rocker. A release force acting on the release surface 28 pivots the latching section 42 downward away from the collar 20 in order to bring the latching contour 12 out of the radius of movement of the clamping limb 9. In this way, a stop for the clamping leg 9 formed by the latching contour 12 can be canceled.FIG. 26 shows a side sectional view of the conductor connection terminal 1 from FIG. 24 with the spring force terminal 3 in the closed starting position. It can be seen that the conductor insertion opening 4 leads out towards the conductor passage opening 19 of the busbar 5 and is aligned towards the release surface 28 in an alignment indicated by the dashed line. The release surface 28 is arranged transversely to the collar opening below the collar 20, wherein "transversely" is not to be understood as an exact perpendicular arrangement, but rather an orientation which inhibits the alignment to such an extent that an inserted electrical conductor 39 impinges on the release surface 28.It can also be seen that an actuating presser 40 is slidably installed in the actuating opening 8. It can be held captive in the insulating housing 2 by positive locking.FIG. 27 shows a side sectional view of the conductor connection terminal 1 from FIG. 24 with spring force terminal 3 in the hold-open position. It can be seen that the clamping leg 9 is pivoted in the direction of the contact leg 10 by the actuating pusher 40 having been displaced into the interior of the insulating material housing 2 and toward the busbar 5. An actuating force is thus exerted on an actuating surface of the clamping limb 9, which pivots the latter towards the contact limb 10 counter to the spring force. In this case, the clamping leg 9 is guided past the latching contours 12 in that the clamping leg either presses apart the mutually opposite webs of the latching section 42 or pivots the latching section 42 downward away from the collar 20. After overcoming the latching contours 12, the clamping leg reaches behind these latching contours 12, so that a stop is formed. The clamping leg 9 is thus held by the hold-open element 7 in the hold-open position shown.FIG. 28 shows a side sectional view of the conductor connection terminal 1 from FIG. 27 with the spring force terminal connection 3 unlocked in the closed clamping position. It can be seen that the clamping leg 9 is sprung out against the electrical conductor 39, with the result that the clamping edge 17 bears against the stripped end of the electrical conductor 39 and possibly digs into its surface. On the opposite side, the electrical conductor 39 abuts the clamping portion 23 of the collar 20. The electrical conductor 39 is thus electrically conductively clamped to the busbar 5 by the spring force of the clamping spring 6 and is mechanically secured against being pulled out or released.The stop of the latching contours 12 for the clamping leg 9 formed in the hold-open position is cancelled by the conductor end striking the release surface 28 when the electrical conductor 39 is inserted, in that a release force is exerted in the conductor insertion direction L, by means of which the latching section 42 is pivoted downward away from the end of the clamping leg 9 via the force flow through the vertical section 42.FIG. 29 shows a perspective top view of the hold-open element 7 of the fourth embodiment of the spring-force clamping connection 3 from FIG. 25 ; it can be seen that the fastening section 25 is formed from two parallel holding webs 45 spaced apart from one another, which are connected to one another by a transverse web 46 as the root region. The retaining webs 45 can have depressions 47 at their mutually facing inner edge edges in order to bring about a clawing of the hold-open element 7 on the collar 20 by the material flaps formed thereby. The frame-like fastening section 25 can be positively plugged onto the collar 20 and held there in a force-fitting manner by the spring clamping force.The retaining webs 45 are connected in one piece to the spring arm section 41 projecting therefrom, which connects these in the manner of a transverse web on the side opposite the transverse web 46. Projecting from the spring arm section 41 are two webs for forming the latching section 42, which are spaced apart from one another and extend parallel to one another and parallel to the fastening section 25.At the inner edge edges of the two webs of the latching section 42, the latching contours 12 are formed as prongs pointing obliquely towards one another. The webs can taper from the spring arm section 41 towards the latching contours 12 in order to then widen again at the latching contours 12.The section 43 extending vertically from the latching section 42 is likewise designed as a web which adjoins in each case a web of the latching section 42 and is bent away from the latter.The two webs of the spring arm section 41 are connected to one another at a distance from the plane of the latching section 42 by a release surface 28 bent transversely therefrom. The trip surface 28 may optionally be curved as shown. The release surface 28 is thus stabilized. Alternatively or additionally, it can also be reinforced by beads and / or ribs.FIG. 30 shows a plan view of the hold-open element 7 for the spring force clamping connection 3 from FIG. 29 It can be seen that the latching contours 12 of the latching arm 11 or latching section 42 project into the inner contour of the frame-like fastening section 42. It is also clear that the release surface 28 extends over a substantial part of the surface of the inner contour of the frame-like fastening section 42 and thus forms a base for the alignment running in the viewing direction for an inserted electrical conductor 39.FIG. 31 shows a cross-sectional view of a plan view of the conductor connection terminal 1 from FIG. 27 with spring force terminal connection 3 in the hold-open position in section F-F (cf. FIG. 27 ). It is clear that the clamping leg 9 is locked on the mutually facing latching contours 12. The intermediate space between the latching contours 12 is smaller at the smallest point than the width of the clamping limb 9 which it has in its radius of movement intersecting the latching contours 12.FIG. 32 shows a side view of the hold-open element 7 for the spring force clamping connection 3 from FIG. 25 The configuration bent in an S-shape with the three planes, which is formed from the fastening section 45, the latching section 42 lying underneath and the release surface 28 lying underneath and the two vertical sections, i.e. the spring arm section 41 and the section 43, becomes clear.FIG. 33 shows a front view of the hold-open element 7 for the spring force clamping connection 3 from FIG. 29 ; it can be seen that the release surface 28 extends over the width of the hold-open element 7 and connects the two vertical web-like sections 43 to one another.FIG. 34 shows a front view of the fourth embodiment of the spring force clamping connection 3 from FIG. 25 The clamping spring 6 is inserted with its contact leg 10 and clamping leg 9 into the conductor passage opening 19 of the busbar 5. The collar 20 is formed on the underside of the busbar 5. The holding-open element 7 is plugged with its fastening section 25 onto the collar 20 and fastened there in a form-fit and force-fit manner.FIG. 35 shows a perspective view of the fourth embodiment of the spring force clamping connection 3 in the closed starting position. The clamping leg 9 is sprung with its free end against the second collar end side wall 22 and bears on the opposite side against the first collar end side wall 21.FIG. 36 shows a perspective view of the fourth embodiment of the spring force clamping connection 3 with inserted electrical conductor 39, the electrical conductor 39 being inserted through the conductor passage opening 19 and the collar 20 and striking the release surface 28 delimiting the insertion path. The clamping leg 9 latched on the latching contours 12 is thus unlatched and can spring out against the electrical conductor 39 in order to clamp it at the clamping point between the clamping edge 17 of the clamping leg 9 and the clamping section 23 of the busbar 5.FIG. 37 shows a side view of the fourth embodiment of the spring force clamping connection 3 in the closed starting position with actuating pusher 40, which is positioned above the clamping limb 9. As illustrated, it can already rest on the clamping leg 9 in the starting position, in order to thus restrict the freedom of movement of the actuating presser 40.FIG. 38 shows a side sectional view of the fourth embodiment of the spring force clamping connection 3 in the latched hold-open position with actuating pusher 40 The actuating pusher 40 is displaced downwards with respect to the busbar 5 and exerts an actuating force on the clamping limb 9. The clamping leg 9 is thus pivoted toward the contact leg 10, so that it reaches behind the latching contour 12 and latches there in the hold-open position. Thus, the hold-open element 7 fixed to the busbar 5 holds the clamping leg 9 in the hold-open position. The clamping leg 9 is under mechanical tension by the spring force stored in the spring arch 18. Upon disengaging, this leads to a pivoting of the clamping leg 9 away from the contact leg 10 to the clamping section 23 on the obliquely positioned second collar end side wall 22 into the closed starting position from FIG. 37 or with the inserted conductor 39 into the closed clamping position.List of reference characters1 Conductor connection terminal 2 Insulating material housing 3 Spring force clamping connection 4 Conductor insertion opening 5 Busbar 6 Clamping spring 7 Holding open element 8 Actuation opening 9 Clamping limb 10 Contact limb 11 Latching arm 12 Latching contour 13 Release section 14 Latching foot 15 Bridging opening 16 Bridging contact 17 Clamping edge 18 Spring bow 19 Conductor passage opening 20 Collar 21 First collar end side wall 22 Second collar end side wall 23 Clamping section 24 Collar longitudinal side wall 25 Fastening section 26 Spring arm 27 Release contour 28 Release surface 29 Edge 30 Root region 31 Flank wall 32 Spacer tongue 33 Side wall 34 End wall 35 Bearing projection 36 Base plate 37 Base section 38 Material tab 39 Electrical conductor 40 Actuation presser 41 Spring arm section 42 Latching section 43 Section, vertically 44 Retaining tab 45 Retaining webs 46 Transverse web 47 Depression 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 citedEP 2 768 079 B1

[0005] EP 3 469 659 B1

[0006]

Claims

Spring force clamping connection (3) having - a busbar (5) and - a clamping spring (6) which has a clamping limb (9) with a clamping edge (17) for clamping an electrical conductor (39) to the busbar (5), a contact limb (10) which bears against the busbar (5) and bears the clamping spring (6) on the busbar (5), and a spring bend (18) which connects the contact limb (10) to the clamping limb (9), characterized in that the spring force clamping connection (3) has an open retaining element (7) with a spring-elastic latching arm (11) which has a latching contour (12) and which, in an open retaining position in which the clamping limb (9) is deflected towards the contact limb (10) counter to the spring force, has, The clamping arm is positioned laterally next to the side edge of the clamping leg (9) and is configured to latch the clamping leg (9) deflected toward the contact leg (10) in the hold-open position counter to the spring force of the clamping spring (6) with the latching contour (12), and the hold-open element (7) has a release section (13), wherein the release section (13) is configured to be deflected by an electrical conductor (39) inserted to the busbar (5) for clamping and thereby to displace the elastically resilient latching arm (11) away from the side edge of the clamping leg (9) and to unlatch the clamping leg (9) latched to the latching contour (12) in the hold-open position.Spring force clamping connection (3) according to Claim 1, characterized in that the latching contour (12) of the latching arm (11) forms a stop for one of the side edges of the clamping limb (9).Spring force clamping connection (3) according to Claim 1 or 2, characterized in that the latching arm (11) with its latching contour (12) is movable resiliently away from the side edge edge of the clamping limb (9) in the width direction of the clamping limb (9).Spring force clamping connection (3) according to one of Claims 1 to 3, characterized in that the release section (13) is formed integrally with the hold-open element (7) or is formed on a separate release part which interacts with the hold-open element (7).Spring force clamping connection (3) according to Claim 4, characterized in that the elastically resilient release section (13) is formed integrally with the elastically resilient latching arm (11), wherein the release section (13) is bent out of the latching plane of the latching arm (11) which has the latching contour (12) and forms a release surface (28) for the free end of an inserted conductor (39) which is to be clamped in the conductor insertion direction (L) below the latching plane.Spring force clamping connection (3) according to one of the preceding claims, characterized in that the hold-open element (7) has a fastening section (25) which is fixed to the busbar (5), and in that the spring-elastic latching arm (11) extends from the fastening section (25) at a distance from the busbar (5) parallel to the plane of the busbar (5) spanned there.Spring force clamping connection (3) according to Claim 6, characterized in that the busbar (5) has a conductor passage opening (19), and the clamping spring (6) projects with the clamping limb (9) and the bearing limb (10) into the conductor passage opening (19), wherein the hold-open element (7) has a fastening portion (25) which is fixed to the conductor passage opening (19), and the spring-elastic latching arm (11) extends from the fastening portion (25) at a distance from the busbar (5) parallel to the plane spanned by the conductor passage opening (19).Spring force clamping connection (3) according to Claim 7, characterized in that the conductor passage opening (19) has a collar (20) which extends away from the plane of the busbar (5) spanned by the conductor passage opening (19) in a conductor insertion direction (L) and partially or completely delimits the conductor passage opening (19) and has two collar longitudinal side walls (24) spaced apart from one another and lying opposite one another, wherein the fastening section (25) of the hold-open element (7) has two flank walls (31) spaced apart from one another, which are connected to one another via an end-side root region (30) and bear against the collar longitudinal side walls (24), wherein the flank walls (31) are fixed to the collar (20) in a force-fitting manner by a spring force applied by the root region (30).Spring force clamping connection (3) according to one of the preceding claims, characterized in that the elastically resilient latching arm (11) has a release contour (27) and the release section (13) formed integrally with the elastically resilient latching arm (11) is guided past the elastically resilient latching arm (11) adjacent to the release contour (27) and is bent out of the latching plane of the latching arm (11) having the latching contour (12) and forms a release surface (28) for the free end of an inserted conductor (39) to be clamped below the latching plane in the conductor insertion direction (L), wherein the release section (13) is formed for the lateral deflection of the latching arm (11) by a loading of the release contour (27) when the release surface (28) is displaced away from the busbar (5) by an inserted electrical conductor (39).Spring force clamping connection (3) according to Claim 9, characterized in that the release section (13) is guided past the elastically resilient latching arm (11) between the latching contour (12) and the release contour (27).Spring force clamping connection (3) according to one of the preceding claims, characterized in that the release section (13) has a release surface (28), which is designed to be reinforced, for example, by a bead contour or rib structure, for the free end of an inserted conductor (39) to be clamped.Spring force clamping connection (3) according to one of Claims 6 to 11, characterized in that spacer tongues (32) extend from the fastening section (25) of the hold-open element (7) towards the busbar (5)Spring force clamping connection (3) according to one of Claims 6 to 12, characterized in that the hold-open element (7) has two mutually opposite side walls (33), base portions (37) projecting towards one another from the side walls (33) and an end wall (34) extending between the side walls (33) transversely with respect to the side walls (33) and the base portions (37), and has a base plate (36) which is separate from the side walls (33) with their base portions (37) and the end wall (34), the base plate (36) being arranged between the side walls (33), being mounted on the base portions (37) and being fixed to the side walls (33) by means of bearing projections (35), the base plate (36) forming the release portion (13) and being mounted on the end wall (34) of the hold-open element (7) by means of a bearing region which is bent towards the busbar (5), wherein the contact leg (10) is connected to the hold-open element (7) and the hold-open element (7) bears spring-elastically on the busbar (5), and wherein the latching contour (12) is formed on one of the side walls (33), which forms the elastically resilient latching arm (11).Spring force clamping connection (3) according to one of the preceding claims, characterized in that the hold-open element (7) has two latching arms (11) which are arranged at a distance from one another and are opposite one another, wherein the two latching arms (11) each have latching contours (12) for latching the clamping limb (9).Conductor connection terminal (1) with - an insulating material housing (2) and - a spring force clamping terminal (3) according to one of the preceding claims, wherein the insulating material housing (2) has a conductor insertion opening (4) for inserting an electrical conductor (39) to a clamping point formed between a busbar clamping section (23) of the busbar (5) and the clamping edge (17) of the clamping limb (9) in order to clamp the inserted electrical conductor (39) between the busbar clamping section (23) and the clamping edge (17), characterized in that the conductor insertion opening (4) opens out towards the clamping point and is oriented in this way, an electrical conductor (39) inserted into the conductor insertion opening (4) comes into contact with the release section (13) and displaces the elastically resilient latching arm (11) by displacing the release section (13) to disengage the clamping leg (9) latched on the latching contour in the hold-open position.Conductor connection terminal (1) according to Claim 15, characterized in that the insulating material housing (2) has an actuating opening (8) which is open towards the clamping limb (9) in order to displace the clamping limb (9) in the direction of the contact limb (10) into the open retaining position counter to the spring force of the clamping spring (6) by means of an actuating tool which is introduced into the actuating opening (8) or an actuating element (40) which is movably installed in the actuating opening (8).

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