Spring clamp connection and conductor connection terminal

Abstract

Spring-loaded clamping connection (2) with a busbar (3) and a clamping spring (4), which has a clamping leg (6) with a clamping edge (11) for clamping an electrical conductor (23) to the busbar (3), a contact leg (5) which rests on the busbar (3) and supports the clamping spring (4) on the busbar (3), and a spring arc (7) which connects the contact leg (5) with the clamping leg (6), characterized in that a retaining leg (14) is attached to the contact leg (5), which has a detent contour (15) designed to lock the clamping leg (6) deflected towards the contact leg (5) against the spring force of the clamping spring (4) in an open position.

Description

The invention relates to a spring force clamping connection having a busbar and a clamping spring. The clamping spring has a clamping leg with a clamping edge for clamping an electrical conductor to the busbar, a contact leg which bears against the busbar and supports the clamping spring on the busbar, and a spring bow which connects the contact leg to the clamping leg.The invention further relates to a conductor connection terminal with an insulating material housing and with such a spring force connection terminal in the insulating material housing.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 can be pressed away from the busbar by the electrical conductor against the force of the clamping spring during direct connection. This is possible for rigid conductors, but not for multi-wire conductors or stranded conductors.There is a need for the clamping of electrical conductors to provide a spring force clamping connection in a self-holding manner in an open position. It is often desired that conductor connection terminals with open spring force clamping connection are delivered at the factory.DE 20 2011 051 466 U1 discloses a clamping spring for a connection terminal with a clamping leg which merges into a first clamping device (i.e. a spring arch), which is adjoined by a base leg and, after a second clamping device, by a latching leg. The locking leg has projections projecting from the plane of the locking leg, which form a stop for the clamping edge of the opened clamping leg when the clamping leg is displaced against the spring force towards the base leg.EP 2 466 689 B1 discloses a clamping contact for the electrical connection of conductors to a clamping point which comprises a contact field for bearing the electrical conductor and a spring leg, the free end of which holds the electrical conductor between itself and the contact field when the clamping contact is closed. The clamping contact has a separate triggering lever which is arranged in the movement path of the electrical conductor and is operatively connected to the spring limb in an operative connection which holds the spring limb in an open position.WO 2021 / 105280 A1 discloses a direct plug-in terminal for connecting an electrical conductor to a busbar and a clamping spring acting as a compression spring and a retaining spring for latching the clamping spring in an open position.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 12. Advantageous embodiments are described in the dependent claims.It is proposed that the contact leg is adjoined by a holding leg which has a latching contour which is designed for latching the clamping leg deflected towards the contact leg counter to the spring force of the clamping spring in a holding-open position.The holding leg is thus formed integrally with the clamping spring as an extension of the contact leg. This has the advantage of a lower material and assembly requirement. In addition, a compact construction can be realized therewith.The holding leg can be resilient in the region of the latching contour. The unlocking thus takes place by spring-elastic displacement of the region of the locking contour itself.The latching contour can be formed by the end section of the clamping spring at the free end of the holding leg. The free end of the clamping spring is the trailing end of the clamping spring, at which the clamping spring ends and no longer adjoins a further part.The latching contour of the holding leg can form a stop for the free clamping end of the clamping leg having the clamping edge. In this case, the two free ends of the holding leg and of the clamping leg can engage one into the other in a form-fitting manner. Due to a spring elasticity of the free end of the holding leg, the latter can be displaced for unlocking in order to release the clamping leg. The free end of the holding leg then springs back into the latching position.The holding leg can have an elastically resilient release region adjoining the busbar. The release region can be configured to be elastically deflected counter to the spring force of the holding leg by an electrical conductor inserted for clamping to the busbar and thereby to unlatch the clamping leg latched in the hold-open position.The position of the holding leg adjoining the busbar can be such that the holding leg is mounted on the busbar directly or indirectly via the contact leg. The busbar thus forms a bearing point for the holding leg.The release region can form an emerging free end of the clamping spring.The release region can extend transversely to the clamping leg latched to the holding leg in the open holding position. The release region provides a release surface on which an electrical conductor to be clamped impinges in order to exert a release force, which displaces the holding leg, on the release region.For an extension "transversely" to the plane of the clamping leg, no exactly perpendicular alignment is required. It is sufficient that the plane spanned by the release region is on the plane pinned by the clamping leg. Preferably, the angle is more than 45° and more preferably 90°±20°.The bus bar may have a conductor through hole. The clamping spring can project with its contact leg and clamping leg into the conductor plug-through opening. This achieves a compact construction with stable self-supporting mounting of the clamping spring on the busbar. The conductor plug-through opening can be surrounded completely or partially by a collar. A collar end wall can be set obliquely towards the clamping limb in order to form a clamping projection for clamping an electrical conductor between the clamping projection and a clamping edge of the clamping limb.The holding leg can be bent away from the clamping leg below the busbar on the underside facing away from the spring arch of the clamping spring on the upper side of the busbar facing away from the clamping leg. The available space in the conductor insertion direction below the busbar is thus used for positioning the holding leg.The clamping spring can have an indentation in the transition region between the contact limb to the holding limb or in the region of the contact limb adjoining the holding limb. Such an indentation allows a form-fit mounting of the clamping spring on a corresponding bearing contour of the busbar and / or the insulating material housing. This form-fitting mounting results in decoupling of the movement and / or force application of the clamping leg from the holding leg and / or vice versa.The clamping spring can abut the busbar with an indentation. This can be the abovementioned indentation, which is arranged between the contact limb and the holding limb or in the region of the contact limb adjoining the holding limb. The clamping spring can thus bear against the busbar in a defined position with the aid of the indentation. For example, the edge of a conductor plug-through opening of the busbar or of a collar enclosing the conductor plug-through opening can lie in the indentation.The conductor connection terminal according to the invention has an insulating material housing and a spring force terminal connection described above in the insulating material housing. The insulating housing has a conductor insertion opening for inserting an electric conductor to a terminal formed between a bus bar clamping portion of the bus bar and the clamping edge of the clamping leg to clamp the inserted electric conductor between the bus bar clamping portion and the terminal. The conductor insertion opening can be opened toward the holding leg and be oriented such that an electrical conductor inserted into the conductor insertion opening comes into contact with the holding leg and displaces the latter for disengaging the clamping leg which is latched to the latching contour in the open holding position.The retaining leg is thus positioned with its release region in alignment with the conductor insertion opening.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. The clamping spring can thus be opened with the aid of the actuating tool inserted into the actuating opening or actuating element installed therein and latched on the retaining leg in the retaining open position.The insulating material housing can have a bearing core, wherein the holding leg is mounted on the bearing core of the insulating material housing. The holding leg can thus be substantially supported on the bearing core of the insulating material housing.The holding leg can encompass the bearing core. The transmission of forces of the holding leg to the contact leg is thus further reduced.In the context of this application, the words "a / an", unless expressly defined otherwise, are not to be understood as a numerical word, but rather as an indeterminate article having the word sense of "at least one / one".The invention allows various embodiments and is described in more detail below by way of example with reference to an exemplary embodiment. The following are shown: FIG. 1 shows a perspective side view of a conductor terminal with a first embodiment of a spring force terminal in the hold-open position; FIG. 2 is a side sectional view of the conductor connection terminal from FIG. 1 in the hold-open position; FIG. 3 is a perspective side view obliquely from behind of the conductor connection terminal from FIG. 1 ; FIG. 4 shows a perspective side view of the conductor connection terminal from FIG. 1 in the clamping position with an electrical conductor clamped on; FIG. 5 shows a side sectional view of the conductor connection terminal from FIG. 4 in the clamping position; FIG. 6 shows a side view of the conductor connection terminal from FIG. 5 in the clamping position; FIG. 7 is a perspective side view obliquely from behind of the conductor connection terminal from FIG. 4 ; FIG. 8 shows a perspective side view of the conductor connection terminal from FIG. 1 in the closed position without an electrical conductor; FIG. 9 is a side sectional view of the lead terminal of FIG. 8 in the closed position; FIG. 10 shows a perspective side view obliquely from behind of the conductor connection terminal from FIG. 8 ; FIG. 11 is a side view of the clamping spring of the first embodiment of a spring force clamping terminal in the hold-open position; FIG. 12 is a side sectional view of the clamping spring from FIG. 11 ; FIG. 13 is a perspective view of the clamping spring from FIG. 11 in the hold-open position; FIG. 14 is a rear perspective view of the clamping spring of FIG. 11 in the hold-open position; FIG. 15 is a side view of the clamping spring from FIG. 11 in the sprung clamping position; FIG. 16 is a side sectional view of the clamping spring from FIG. 15 ; FIG. 17 shows a perspective view of the clamping spring from FIG. 15 in the sprung clamping position; FIG. 18 shows a perspective rear view of the clamping spring from FIG. 15 in the sprung clamping position; FIG. 19 is a perspective side view of a conductor terminal with a second embodiment of a spring force terminal in the hold-open position; FIG. 20 is a side sectional view of the conductor terminal of FIG. 19 in the hold-open position; FIG. 21 is a perspective side view obliquely from behind of the conductor connection terminal from FIG. 19 ; FIG. 22 shows a perspective side view of the conductor connection terminal from FIG. 19 in the clamping position with an electrical conductor clamped on; FIG. 23 shows a side sectional view of the conductor connection terminal from FIG. 22 in the clamping position; FIG. 24 shows a side view of the conductor connection terminal from FIG. 23 in the clamping position; FIG. 25 shows a perspective side view obliquely from behind of the conductor connection terminal from FIG. 22 ; FIG. 26 is a perspective side view of the conductor terminal of FIG. 19 in the closed position without an electrical conductor; FIG. 27 is a side sectional view of the lead terminal of FIG. 26 in the closed position; FIG. 28 is a perspective side view obliquely from behind of the conductor connection terminal from FIG. 26 ; FIG. 29 is a side view of the clamping spring of the second embodiment of a spring force clamping terminal in the hold-open position; FIG. 30 is a side sectional view of the clamping spring from FIG. 29 ; FIG. 31 is a perspective view of the clamping spring from FIG. 29 in the hold-open position; FIG. 32 is a rear perspective view of the clamping spring of FIG. 29 in the hold-open position; FIG. 33 is a side view of the clamping spring from FIG. 29 in the sprung closed position or clamping position; FIG. 34 is a side sectional view of the clamping spring from FIG. 33 ; FIG. 35 shows a perspective view of the clamping spring from FIG. 33 in the sprung clamping position; FIG. 36 is a rear perspective view of the clamping spring from FIG. 33 in the expanded clamping position.FIG. 1 shows a perspective side view of a conductor terminal 1 with a first embodiment of a spring force terminal 2 in the hold-open position.The spring force clamping terminal 2 has a bus bar 3 and a clamping spring 4. The clamping spring 4 is designed as a leg spring with a contact leg 5, a clamping leg 6 and a spring bend 7 connecting the contact leg 5 to the clamping leg 6. The busbar 3 has a conductor plug-through opening 8, which is bounded by edge webs 9. The clamping spring 4 projects with its contact leg 5 and clamping leg 6 into the conductor plug-through opening 8.A clamping section 10 is bent away from the busbar 3 from the conductor plug-through opening 8, which clamping section extends away from the plane of the busbar 3 on the underside of the busbar 3, i.e. on the side opposite the spring bend 7.The clamping leg 6 has a clamping edge 11 at its free end. The free end of the clamping leg 6 is the end facing away from the spring arch 7, at which the clamping spring runs out, i.e. ends.The spring force clamping terminal 2 is installed in an insulating material housing 12. This is only schematically depicted. Above the conductor plug-through opening 9, it can have a conductor insertion opening positioned next to the clamping leg 6, which leads out to the conductor plug-through opening 8 and is designed for the insertion of an electrical conductor and guiding of the electrical conductor into a conductor collection pocket 13 below the conductor plug-through opening 9.The contact leg 5 is adjoined after bending by a holding leg 14. The holding leg 14 has a latching contour 15 in the form of a holding tab which projects toward the busbar 3 and is formed from the sheet metal material of the holding leg 14. The latching contour 15 forms a stop for the free end of the clamping leg 6 when the latter is pivoted against the spring force of the clamping spring 4 toward the contact leg 5.The holding leg 14 terminates with a release region 16 arranged in the conductor collection pocket 13. The release region 16 is oriented transversely to the alignment of the conductor plug-through opening 9 or approximately parallel to the plane of the busbar 3 spanned in the region of the conductor plug-through opening 8.It can be seen that the insulating material housing 12 has an optional bearing core 17 in the region below the busbar 3 and next to the conductor collecting pocket 13. The clamping spring 4 is bent over in such a way that it engages around the bearing core 17. The contact leg 5 or the transition region between the contact leg 5 and the holding leg 14 is thus mounted on the insulating material housing 12 in a defined manner.An elastically resilient latching arm 19 adjoins a bend 18 which engages around the bearing core 17 and has the latching contour 15 which projects towards the busbar 3. This latching arm 19 extends toward the clamping section 10 of the busbar 3.The insulating material housing 12 can furthermore have a bearing pin 20 which is partially surrounded by the spring arch 7. The clamping spring 4 is thus fixed in position on the bearing journal 20. The clamping spring 4 is supported with its contact leg 5 on the end wall delimiting the conductor passage opening 8. For this purpose, a bearing tab 21 can be bent out of the conductor plug-through opening 8 pointing toward the spring bend 7 in order to form a contact wall for the contact leg 5. An additional bearing point is provided with the bearing core 17 which is surrounded by the bend 18 of the clamping spring 4.FIG. 2 shows a side sectional view of the conductor connection terminal from FIG. 1 in the hold-open position.It can be seen that the free end of the clamping leg 6 is latched with its clamping edge 11 behind the latching contour 15, i.e. the retaining tab protruding toward the busbar 3, in the hold-open position. This latching contour 15 forms a stop for the clamping leg 6 in order to hold it in the hold-open position.The release region 16 is arranged at a distance from the plane of the busbar 3 having the conductor through-opening 8 and approximately parallel thereto. This release region 16 is adjoined by a setting step 22 which extends towards this plane of the busbar 3 and from which, on the one hand, the latching arm 19 is bent transversely thereto and which, on the other hand, runs out with the retaining tab, i.e. the latching contour 15. The latching arm 19 is formed from two parallel webs. The intermediate material can thus be used for the latching contour 15 and the spring elasticity can be improved.The clamping leg 6 can have a plurality of bends in order to adjust the position of the clamping edge 11 depending on the constructive pivot radius on the one hand to the locking position in the hold-open position behind the latching contour 15 and on the other hand to the clamping position for an electrical conductor arranged between the clamping section 10 and the clamping edge 11 and to adjust the closed position of the clamping leg 6 on the clamping section 10.The contact leg 5 abuts with a bend on the bearing tab 21 and is mounted in a form-fitting manner on the busbar 3. It merges into a holding leg 14 which engages around the bearing core 17 of the insulating material housing 12 by means of a bend 18. The bearing core 17 extends in the direction of the plane of the busbar 3 towards the bearing tab 21 and is thus positioned between the contact limb 5 and the clamping limb 6. The contact leg 5 is thus connected positively on one side to the busbar 3 and positively on the other side to the bearing core 17, which permits movement only within a narrow range of movement. The clamping spring 4 is fixed at two oppositely acting bearing points, i.e. on the one hand between the bearing tab 21 and the upper part of the bearing core 17 and on the other hand with the bend 18 at the lower part of the bearing core 18.The bearing core 17 serves with its upper part at the same time as an overload stop for the clamping leg 6.FIG. 3 shows a perspective side view obliquely from behind of the conductor connection terminal 1 from FIG. 1.It is clear that the bearing bend 26 of the contact limb 5 is adjoined by a section having two parallel webs 27 which are spaced apart from one another and which merge with the bend 18 into the approximately horizontal elastically resilient latching arm 19. It can be seen that the clamping leg 6 is latched behind the latching contour 15 (retaining tab) protruding from the plane of the latching arm 19.The vertical setting step 22 adjoining the latching arm 19 next to the latching contour 15 ensures a height offset of the release surface of the release region 16 relative to the latching contour 15.FIG. 4 shows a perspective side view of the conductor connection terminal 1 from FIG. 1 in the clamping position with an electrical conductor 23 clamped on.The electric conductor 23 can be inserted into a conductor insertion opening (conductor insertion channel) of the insulating housing 12 which is not shown and opens out toward the conductor insertion opening 8. However, it is also conceivable for the conductor plug-through opening 8 to be accessible directly from the outside, as outlined. The electrical conductor 23 is inserted with its stripped end 24 through the conductor insertion opening 8 in the plane of the busbar 3 and protrudes into the conductor collection pocket 13. The stripped end 24 abuts the clamping section 10.It can be seen that the end face of the stripped end 24 of the electrical conductor 23 impinges on the trip region 16 and displaces the latter downward away from the plane of the busbar 3 in the conductor insertion direction L. With the aid of the subsequent setting step 22, the elastically resilient latching arm 19 together with the latching contour 15 likewise moves downward away from the plane of the busbar 3 in order to cancel the stop for the clamping limb 6. It can be seen that the clamping leg 6 thus unlocked is now in the clamping position and clamps the electrical conductor 23 between the clamping edge 11 and the clamping section 10.It is also clear that the contact limb 5 and the part adjoining it up to the bend 18 are fixed in position.The holding leg 14 is formed at least from the latching arm 19, the riser 22 and the release region 16. It does not matter whether the bend 18 and the section extending as far as the bearing tab 21 are assigned to the holding leg 14 or to the contact leg 5. Due to the mounting of the bend 18 on the bearing core 17, the section functionally serves like the contact leg 5 for mounting the clamping spring 4.It is clear that the latching arm 19 is formed from two parallel webs 27 spaced apart from one another, which rest on the lower part of the bearing core 17. In the intermediate space between the webs 27, the retaining tabs protrude from the plane spanned by the latching arm 19 in order to form the latching contour 15.FIG. 5 shows a side sectional view of the conductor connection terminal 1 from FIG. 4 in the clamping position.It can be seen that the clamping section 10 can have a protrusion 25 which forms a clamping point introduced toward the electrical conductor 23, onto which the clamping force of the clamping spring 4 is concentrated. This improves the surface pressure.FIG. 6 shows a side view of the conductor connection terminal 1 from FIG. 5 in the clamping position.It is clear from the corresponding sectional illustration from FIG. 5 that the stripped end 24 of the electrical conductor 23 is inserted between the edge webs 9 and the clamping section 10 into the conductor through-opening 8 which is limited thereby.FIG. 7 shows a perspective side view obliquely from behind of the conductor connection terminal 1 from FIG. 4.It can be seen that the stripped end 24 of the electrical conductor 23 is inserted through the conductor insertion opening 8 bounded by the edge webs 9 and the protrusion 25 of the clamping section 10 and impinges on the release region 16.It is clear that the stripped end 24 is clamped between the protrusion 25 and the clamping edge 11.FIG. 8 shows a perspective side view of the conductor connection terminal 1 from FIG. 1 in the closed position without an electrical conductor 23.The clamping leg 6 is sprung away from the contact leg 5 directly under the protrusion 25 and bears there against the clamping section 10. The protrusion 25 thus also serves as a stop for the clamping leg 6, in order to prevent further springing out of the conductor plug-through opening 8.FIG. 9 shows a side sectional view of the conductor connection terminal 1 from FIG. 8 in the closed position.It is clear that the clamping leg 6 rests with its clamping edge 11 directly under the protrusion 25.A rigid electrical conductor 23 can also be clamped without prior opening of the clamping spring 4 by being placed on the clamping limb 6 and pushing it away towards the contact limb 5.FIG. 10 shows a perspective side view obliquely from behind of the conductor connection terminal 1 from FIG. 8.It is clear here that the clamping spring 4 is mounted on the rear side with the contact limb 5 on the bearing tab 21 and on the front side with the clamping edge 11 of the clamping limb 6 on the clamping section 10. The spring curve 7 engages around the bearing pin 20, which prevents tilting of the clamping spring 4.FIG. 11 shows a side view of the clamping spring 4 of the first embodiment of a spring force clamping connection 1 in the hold-open position.The clamping leg 6 is locked with its free end, which has the clamping edge 11, by the locking contour 15. For this purpose, the retaining tab 15 projecting from the plane of the latching arm 19 forms a stop.It is also clear that the plane of the release surface of the release region 16 is offset in height with respect to the plane of the latching arm 19 in the region of the latching contour 15 with the aid of the setting step 22. The latching arm 19 is elastically resilient up to the bend 18. The mounting of the bend 18 results in a pivot mounting of the latching arm 19 in the region of the bend 18.The leg spring bent in a U-shaped manner with the clamping leg 6, the spring bow 7 and the contact leg 5 continues in an approximately Z-shaped section in the transition from the contact leg 5 to the holding leg 14. The contact limb 5 has an obtuse-angled bearing bend 26 directed away from the clamping limb 6 and the bend 18 directed towards the clamping limb 6. Between the bearing bend 26 and the bend 18 extends a section which can be formed from two parallel webs 27. This forms an indentation in the transition between the contact limb 5 and the holding limb 14 and / or in the region of the contact limb 5 adjoining the holding limb 14. This indentation can abut on the busbar 3 by, for example, a part of the bearing tab 21 protruding into this indentation. It can also abut on the insulating material housing 2. In this case, a part of the insulating material housing 2, for example a protruding section of the bearing core 17, can project into the indentation in order to fix the position of the clamping spring 4 in a positive-locking manner therewith.FIG. 12 shows a side sectional view of the clamping spring 4 from FIG. 11.It can be seen that the latching contour 15 is formed as a retaining tab as an extension of the riser 22 from the material next to the webs of the latching arm 19. The webs 27 of the latching arm 19 continue with the bend 18 via the webs 27 as far as the re-closed part of the contact limb 5.FIG. 13 is a front perspective view and FIG. 14 is a rear perspective view of the clamp spring 4 of FIG. 11 in the hold-open position.It becomes clear how the clamping leg 6 is latched by its free end on the latching contour 15 protruding toward the spring bow 7. Also visible is the section of the clamping spring 4 formed from a parallel pair of webs 27 spaced apart from one another from the latching contour 15 up to the bearing bend 26.FIG. 15 is a side view and FIG. 16 is a side sectional view of the clamping spring 4 in the expanded clamping position.It is clear that the clamping leg 6 unlatched from the latching contour 15 is sprung away from the contact leg 5. This is effected by the spring force of the spring-elastic clamping spring 4 stored in the spring curve 7. This can preferably be formed from a spring steel.FIG. 17 shows a perspective view of the clamping spring 4 from FIG. 15 in the sprung clamping position.It is clear that the latching contour 15 is bent out to the contact limb 5 in the form of a retaining tab bent out of the intermediate space of the webs 27 of the latching arm 19 as an extension of the riser stage 22. The holding tab 15 can be aligned with its alignment in the direction of extension toward the bearing bend 26.FIG. 18 shows a perspective rear side view of the clamping spring 4 from FIG. 15 in the sprung clamping position.The web-shaped structure of the latching arm 19 and the web-shaped bend 18 and the webs 27 up to the bearing bend 26 which in turn extends integrally in one piece in width can be clearly seen.FIG. 19 shows a perspective side view of a conductor terminal 1 with a second embodiment of a spring force terminal 2 in the hold-open position.The basic structure is comparable to the first exemplary embodiment, so that reference can be made to the preceding explanations, in particular for the configuration of the busbar 3 and of the insulating material housing 12.In this exemplary embodiment, the latching arm 19 has a latching contour 15 without a retaining tab. Rather, the front edge in the transition of the web-shaped latching arm 19 to the setting step 22 which extends continuously in width is used as a stop for the free end of the clamping limb 6.The free end section of the clamping leg 6 having the clamping edge 11 is narrower than the section in the transition to the spring bow 7. it can be seen that the width of the free end section of the clamping leg 6 is adapted to the intermediate space of the spacing of the two parallel webs 27 of the latching arm 19, so that the free end section of the clamping leg 6 projects into the latching arm 19, i.e. lies between the webs 27 of the latching arm 19 in the hold-open position.FIG. 20 shows a side sectional view of the conductor connection terminal 1 from FIG. 19 in the hold-open position.It is clear that the free end of the clamping leg 6 is positioned next to the rear web 27 of the rat arm 19 and behind the front edge of the riser step 22 forming the latching contour 15. The setting step 22 thus forms a stop for the clamping leg 6 in order to hold it in the hold-open position pivoted against the force of the clamping spring 4 toward the contact leg 5.FIG. 21 shows a perspective side view obliquely from behind of the conductor connection terminal 1 from FIG. 19.It is clear that the free end of the clamping leg 6 dips into the intermediate space between the webs 27 of the latching arm 19 and lies behind the setting step 22.The bearing core 17 forms an overload stop for the clamping leg 6 by preventing excessive spring deflection toward the contact leg 5. In addition, the latching arm 19 bears against the bearing core 17 in the region of the bend 18. The contact leg 5 is also mounted on the busbar 3 in the region of the bearing tab 21.FIG. 22 shows a perspective side view of the conductor connection terminal from FIG. 19 in the clamping position with an electrical conductor 23 clamped on.The latching contour 15 formed on the front edge of the riser step 22 in the transition to the two webs 27 of the latching arm 19 can be seen.The electrical conductor 23 inserted for connection projects with its stripped end 24 through the conductor insertion opening 8 into the conductor collection pocket 13. Its end face strikes the release region 16 and pivots the latching arm 19 somewhat downward away from the plane of the busbar 3. The latching contour 15 is thus displaced slightly downwards in order to cancel the stop for the clamping leg 6 which is still present in the open holding position in FIG. 21. The clamping leg 6 is now sprung out from the contact leg 5 away from the clamping section 10 by the spring force stored in the spring arch 7.FIG. 23 shows a side sectional view of the conductor connection terminal 1 from FIG. 22 in the clamping position.It can be seen that the stripped end 24 of the electrical conductor 23 is clamped in the clamping position between the clamping edge 11 of the clamping limb 6 and the protrusion 25 of the clamping section 10.It is also clear that the clamping spring 4 is mounted on the bearing tab 21 of the busbar 3 in the bearing bend 26 and on the bearing core 17 in the bend 18.FIG. 24 shows a side view of the conductor connection terminal 1 from FIG. 23 in the clamping position.It is clear that the stripped end 24 of the electrical conductor 23 is inserted through the conductor insertion opening 8 bounded by the edge webs 9 and the clamping section 10.FIG. 25 shows a perspective side view obliquely from behind of the conductor connection terminal 1 from FIG. 22.In this case, the latching contour 15 formed on the front edge of the riser step 22 in the intermediate space of the two webs 27 of the latching arm 19 can be clearly seen.It is also clear in comparison with FIG. 21 that this latching contour 15 is displaced downward away from the plane of the busbar 3 by the triggering force exerted by the electrical conductor 23 in the conductor insertion direction L on the triggering surface of the triggering region 16.In the clamping position, the electrical conductor 23 is clamped between the clamping section 10 and the clamping edge 11 of the clamping leg 6.FIG. 26 shows a perspective side view of the conductor connection terminal 1 from FIG. 19 in the closed position without an electrical conductor 23.The latching arm 19 is now pivoted back into the latching position toward the plane of the busbar 3, such that the distance of the latching contour 15 from the upper plane of the busbar 3, in which the conductor plug-through opening 8 lies, is smaller than in the unlatched position in FIG. 22.FIG. 27 shows a side sectional view of the conductor connection terminal 1 from FIG. 26 in the closed position.It can be seen that the free end of the clamping leg 6 abuts with the clamping edge 11 on the clamping section 10 preferably directly below the protrusion 25 of the clamping section 10.FIG. 28 shows a perspective side view obliquely from behind of the conductor connection terminal 1 from FIG. 26.It is clear that the narrower section of the clamping leg 6 passes through the conductor plug-through opening 8 and engages with its free end, i.e. with the clamping edge 11, under the protrusion 25. The protrusion 25 thus forms a stop for the clamping leg 6.FIG. 29 shows a side view of the clamping spring 4 of the second embodiment of a spring force clamping connection 2 in the hold-open position.It can be seen that the free end of the clamping leg 6 extends through the latching arm 19 and bears against the riser 22. The webs 27 of the latching arm 19 are located laterally next to the free end of the clamping leg 6.For the rest, reference can be made to the description relating to FIG. 11.FIG. 30 is a side sectional view of the clamp spring of FIG. 29.It becomes clear that the free end of the clamping leg 6 dips with its clamping edge into the intermediate space of the webs 27 of the latching arm 19 and bears against the front edge of the riser 22 in the transition to the webs 27 of the latching arm 19.FIG. 31 is a front perspective view and FIG. 32 is a rear perspective view of the clamp spring 4 of FIG. 29 in the hold-open position.The construction of the latching arm 19 formed from the two parallel webs spaced apart from one another is clear, by means of which the free space for receiving the free end of the clamping limb 6 is formed. The free end of the clamping leg 6 abuts the setting step 22 in the transition to the latching arm 19.FIG. 33 shows a side view and FIG. 34 shows a side sectional view of the clamping spring 4 from FIG. 29 in the sprung clamping position.The clamping leg 6 is now unlatched and sprung away from the contact leg 5. In comparison with the first embodiment from FIGS. 15 and 16, it becomes clear that the latching contour 15 is not formed by a protruding retaining tab, but by the riser 22 in the transition of the bending to the latching arm 19.FIG. 35 shows a perspective front view and FIG. 36 shows a perspective rear view of the clamping spring 4 from FIG. 33 in the sprung clamping position.The latching contour 15 formed on the front edge of the riser step 22 can be clearly seen, which is laterally delimited by the webs 27 of the latching arm 19 in the transition of the bending over to the plane of the latching arm 19. The latching arm 19 has an opening through the two webs 27 and the riser 22 serving as a transverse edge, in which opening the free end of the clamping limb 6 can be accommodated. The width of this free end of the clamping leg 6 is adapted to be smaller than the width of the clamping leg in the transition to the spring arch 7.List of reference characters1 Conductor connection terminal 2 Spring force clamping connection 3 Busbar 4 Clamping spring 5 Contact limb 6 Clamping limb 7 Spring bow 8 Conductor plug-through opening 9 Edge webs 10 Clamping section 11 Clamping edge 12 Insulating material housing 13 Conductor collecting pocket 14 Holding limb 15 Latching contour 16 Release region 17 Bearing core 18 Bend 19 Latching arm 20 Bearing journals 21 Bearing tab 22 Setting stage 23 Electrical conductor 24 Stripped end 25 Protrusion 26 Bearing bend 27 Webs L Conductor plug-in directionReferences included in the specificationThis list of documents cited by the applicant has been produced in an automated manner and is only included for the better information of the reader. The list is not part of the German patent application or utility model application. The DPMA does not take any adhesion for any faults or omissions.Patent Literature citedDE 20 2011 051 466 U1

[0005] EP 2 466 689 B1

[0006] WO 2021 / 105280 A1

[0007]

Claims

Spring force clamping connection (2) having - a busbar (3) and - a clamping spring (4) which has a clamping limb (6) with a clamping edge (11) for clamping an electrical conductor (23) to the busbar (3), an abutment limb (5) which bears against the busbar (3) and supports the clamping spring (4) on the busbar (3), and a spring bend (7) which connects the abutment limb (5) to the clamping limb (6), characterized in that the abutment limb (5) is adjoined by a holding limb (14) which has a latching contour (15) which is designed for latching the clamping limb (6) deflected towards the abutment limb (5) counter to the spring force of the clamping spring (4).Spring force clamping connection (2) according to Claim 1, characterized in that the retaining limb (14) is spring-elastic in the region of the latching contour (15).Spring force clamping connection (2) according to Claim 1 or 2, characterized in that the latching contour (15) is formed by a retaining tab projecting from the retaining limb (14) or by an end edge on the retaining limb (14).Spring force clamping connection according to one of the preceding claims, characterized in that the latching contour (15) of the holding limb (14) forms a stop for the free clamping end of the clamping limb (6) having the clamping edge (11).Spring force clamping connection (2) according to one of the preceding claims, characterized in that the holding limb (14) has an elastically resilient release region (16) adjoining the busbar (3), wherein the release region (16) is designed to be elastically deflected counter to the spring force of the holding limb (14) by an electrical conductor (23) inserted for clamping to the busbar (3) and thereby to latch the clamping limb (6) latched in the open holding position.Spring force clamping connection (2) according to Claim 5, characterized in that the release region (16) forms an emerging free end of the clamping spring (4).Spring force clamping connection (2) according to Claim 5 or 6, characterized in that the release region (16) extends transversely with respect to the clamping limb (6) which is latched to the holding limb (14) in the hold-open position.Spring force clamping connection (2) according to one of the preceding claims, characterized in that the busbar (3) has a conductor through-opening (8) and the clamping spring (4) projects with its contact limb (5) and clamping limb (6) into the conductor through-opening (8).Spring force clamping connection (2) according to Claim 8, characterized in that the retaining leg (14) is bent away from the clamping leg (6) below the busbar (3) on the underside, which is remote from the upper side of the busbar (3) facing the spring bend (7) of the clamping spring (4).Spring force clamping connection (2) according to one of the preceding claims, characterized in that the clamping spring (4) has an indentation in the transition region between the contact limb (5) and the holding limb (14) or in the region of the contact limb (5) adjoining the holding limb (14).Spring force clamping connection (2) according to one of the preceding claims, characterized in that the clamping spring (4) bears with an indentation against the busbar (3).Conductor connection terminal (1) with - an insulating material housing (12) and - a spring force clamping terminal (2) according to one of the preceding claims, wherein the insulating material housing (12) has a conductor insertion opening for inserting an electrical conductor (23) to a clamping point formed between a clamping section (10) of the busbar (3) and the clamping edge (11) of the clamping limb (6) in order to clamp the inserted electrical conductor (23) between the clamping section (10) and the clamping edge (11), characterized in that the conductor insertion opening is open towards the holding limb (14) and is aligned such that an electrical conductor (23) inserted into the conductor insertion opening comes into contact with the holding limb (14) and displaces the latter for disengaging the clamping limb (6) which is locked to the latching contour (15) in the open holding position.Conductor connection terminal (1) according to claim 12, characterised in that the insulating material housing (12) has an actuating opening which is open towards the clamping limb (6) in order to displace the clamping limb (6) in the direction of the contact limb (5) by means of an actuating tool inserted into the actuating opening or an actuating element which is installed movably in the actuating opening into the hold-open position counter to the spring force of the clamping spring (4).Conductor connection terminal (1) according to Claim 12 or 13, characterized in that the insulating-material housing (12) has a bearing core (17), and the retaining limb (14) is mounted on the bearing core (17) of the insulating-material housing (12).Conductor connection terminal (1) according to Claim 14, characterized in that the retaining leg (14) engages around the bearing core (17).

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