Conductor terminal

A conductor terminal (1) having an insulating material housing (2) and having at least one spring-loaded clamping connection (11) in the insulating material housing (2) and also having at least one actuation element (4), which is pivotably accommodated in the insulating material housing (2) and is designed to open in each case at least one associated spring-loaded clamping connection (11), is described. The actuation element (4) has two side wall portions (8a, 8b) which are spaced from one another and at least partially enter the insulating material housing (2) with a pivot bearing region (14) and, opposite said pivot bearing region (14), are connected to each other by a transverse web (5) to form a lever arm. The pivot bearing regions (14) of the mutually distanced side wall portions (8a, 8b) of an actuation element (4) form an axis of rotation (D), about which the actuation element (4) is pivotably mounted in the insulating material housing (2). An associated spring-loaded clamping connection (11) is at least partially accommodated in the space between the pivot bearing regions (14) of an actuation element (4). The pivot bearing regions (14) have actuation portions (16), which in each case are designed in order to act on an associated clamping spring (17) of a spring-loaded clamping connection (11) as the actuation element (16) is pivoted from a closed position into an open position, and in that the actuation portions (4) are arranged on the pivot bearing regions (14) of the side wall portions (8a, 8b) at a distance from one another that is shorter than the distance between the side wall portions (8a, 8b). The actuation portions (16) extend parallel to the side wall portions (8a, 8b) and are formed integrally with the side wall portions (8a, 8b), such that in each case a guide slot (30) is provided between an actuation portion (16) and the associated, directly adjacent side wall portion (8a, 8b), and in that a guide web (27) of the insulating material housing (2) in each case enters an associated guide slot (30) for guiding the actuation element (4) in the event of a pivot motion about an axis of rotation (D) in the pivot bearing region (14).

This application is a national phase of International Application No. PCT/EP2014/052715 filed Feb. 12, 2014.

FIELD OF THE INVENTION

The invention relates to a conductor terminal having an insulating material housing and having at least one spring-loaded clamping connection in the insulating material housing and also having at least one actuation element, which is pivotably accommodated in the insulating material housing and is designed to open in each case at least one associated spring-loaded clamping connection.

BACKGROUND

Conductor terminals are known in a variety of forms, for example as box terminals, circuit board terminals, series terminals or as conductor terminals in other electrical apparatuses.

DE 299 15 515 U1 discloses a spring clip for connecting electrical conductors to an insulating material housing, which has a terminal with a clamping spring cooperating with a bus bar piece. An actuation element in the form of a cam lever is integrated in the insulating material housing and is mounted rotatably in the insulating material housing. The axis of rotation of the cam lever is arranged substantially perpendicularly above the clamping point. This leads to a relatively large installation height.

A terminal having a spring-loaded clamping connection and an actuation lever is known from DE 87 04 494 U1, in which the actuation lever is mounted pivotably via its axis of rotation behind the clamping point below the clamping spring, as considered in the conductor insertion direction. An actuation tab is bent at the free clamping limb end and cooperates with an actuation finger of the actuation lever in order to open the spring-loaded clamping connection.

EP 1 622 224 B1 discloses a terminal having an actuation lever, which is mounted rotatably in a bend of a bus bar. The clamping point between clamping spring end and bus bar is provided below the axis of rotation.

The actuation lever is arranged with an actuation portion in the clamping space bordering the conductor insertion opening

DE 20 2009 010 003 U1 presents a connection terminal having a separating lever with pivot means for pivoting a connection spring with respect to a bus bar piece. The separating lever is mounted on a cavity, formed by the bus bar piece, for forming the pivot axis, such that, by means of an actuation finger to be acted on by hand with a lever actuation force and by means of a contact portion for actuating the clamping spring, a lever arm pivotable about the axis of rotation therebetween is formed.

Furthermore, a terminal having an insulating material housing, a bus bar portion and having at least one spring clamping unit with a clamping spring is described in 10 2010 024 809 A1. The clamping spring has an actuation portion, which proceeds from a clamping portion and which extends away from the direction of the spring force of the clamping spring acting at the clamping portion, and is oriented for application by a pivotably mounted actuation lever, such that the actuation lever applies a tensile force to the actuation portion, said tensile force acting counter to the spring force, in order to open the clamping spring.

Proceeding on this basis, the object of the present invention is to create an improved conductor terminal, which can be constructed so as to be as small as possible, having an insulating material housing and having at least one spring-loaded clamping connection in the insulating material housing and also having at least one actuation element, which is pivotably accommodated in the insulating material housing and is designed to open in each case at least one associated spring-loaded clamping connection. The conductor terminal will also be optimized in view of the influence of force of the actuation element on the insulating material housing and the force transmission of the lever pivot force, applied externally to the actuating element, to the actuation force, which acts on the clamping spring.

The object is achieved by the conductor terminal having the features of claim1. Advantageous embodiments are described in the dependent claims.

SUMMARY OF THE INVENTION

It is proposed that the actuation element of a generic conductor terminal has two side wall portions which are spaced from one another and at least partially enter the insulating material housing with a pivot bearing region and, at a distance from said pivot bearing region, are connected to each other by a transverse web to form a lever arm. The pivot bearing regions of the mutually distanced side wall portions of an actuation element here form an axis of rotation, about which the actuation element is pivotably mounted in the insulating material housing. An associated spring-loaded clamping connection is then at least partially accommodated in the space between the pivot bearing regions of an actuation element.

The actuation element thus forms an actuation lever, which is approximately U-shaped in section and which at least partially accommodates the spring-loaded clamping connection in the free space delimited laterally by the side wall portions. The pivot bearing regions therefore are not located above, below, in front of or behind the spring-loaded clamping connection, but are located to the side of the spring-loaded clamping connection or to the side of the clamping spring that is to be actuated of the spring-loaded clamping connection.

A very compact conductor terminal is thus provided, with which the actuation lever, with the pivot bearing regions arranged to the side of the spring-loaded clamping connection in the insulating material housing, is mounted pivotably in the insulating material housing in a stable position and in a robust manner. The pivot bearing regions have actuation portions which in each case are designed in order to act on an associated clamping spring of a spring-loaded clamping connection as the actuation element pivots from a closed position, in which the actuation element is pivoted with its transverse web in the direction of the insulating material housing and a clamping point formed by the spring-loaded clamping connection for clamping an electrical conductor is closed, into an open position, in which the actuation element with its transverse web is pivoted away from the insulating material housing and a clamping point formed by the spring-loaded clamping connection for clamping an electrical conductor is open.

Two actuation portions are arranged on the pivot bearing regions of the side wall portions at a distance from one another that is shorter than the distance between the side wall portions. Here, the actuation portions extend parallel to the side wall portions and are formed integrally with the side wall portions, such that in each case a guide slot is provided between an actuation portion and the associated, directly adjacent side wall portion. A guide web of the insulating material housing in each case then enters an associated guide slot for guiding the actuation element in the event of a pivot motion about a pivot axis in the pivot bearing region.

With the aid of the actuation portions distanced from the side walls of the U-shaped lever arm by an intermediate guide slot, the lever arm can be mounted pivotably in a manner secured against tilting by means of a guide web of the insulating material housing entering a respective guide slot. Very stable pivot bearings can be provided in a space-saving manner with the aid of the guide slots and the guide webs engaging therewith, said pivot bearings being arranged substantially to the side of the spring-loaded clamping connections.

Due to the cooperation of the described measures, an extremely compact conductor terminal is provided, of which the pivot levers are pivotably mounted in a stable manner in the insulating material housing, without actuation forces acting on the at least one pivot lever excessively loading the insulating material housing.

In a preferred embodiment the actuation element is coordinated with the insulating material housing and the associated spring-loaded clamping connection in such a way that the lever pivot force acting on the transverse web in order to pivot the actuation element from the closed position into the open position and the spring actuation force acting on the clamping spring by the actuation portions when pivoting the actuation element from the closed position into the open position act on the same side relative to the axis of rotation.

Due to the positioning of the axis of rotation in the insulating material housing by corresponding design of the pivot bearing regions and by suitable arrangement of the actuation portions relative to the clamping spring, the lever pivot force applied externally to the actuation lever acts on the same side of the axis of rotation with respect to the axis of rotation as the spring actuation force applied to the clamping spring by the actuation portions. A kinematic is thus provided that enables a very compact construction of a conductor terminal with optimal force transmission. In particular, the lever pivot force and the spring actuation force can act in the same direction, i.e. upwardly or downwardly. Here, “upwardly” is understood to mean a direction that is in principle independent of the exact angle of extension, corresponding to the extension direction of an open lever arm pointing toward the free end. The term “downwardly” is understood to mean the opposite direction irrespective of the exact angular position. It is therefore irrelevant whether the forces act equally parallel to one another.

A particularly compact design with optimal guidance and mounting of the actuation elements can be achieved when the adjacent side wall portions of two actuation elements arranged adjacently in the insulating material housing border one another directly. The outer walls of the side wall portions of adjacently arranged actuation elements serve here for mutual guidance and give the adjacent actuation element additional support.

The insulating material housing is preferably formed in two parts with a terminal housing part and a separate cover part. The terminal housing part and the cover part are connected to one another in the assembled state by means of the at least one spring-loaded clamping connection, inserted into the terminal housing part, and associated actuation element. The pivot bearing region is then accommodated in an intermediate space formed between the terminal housing part and cover part.

This spring-loaded clamping connection and the associated actuation element can thus be placed firstly in the terminal housing part in the event of assembly. The conductor terminal is then closed in the terminal housing part by latching the cover part. Due to the arrangement of the pivot bearing region in an intermediate space between the terminal housing part and cover part, portions both of the terminal housing part and the cover part can then contribute to the pivot bearing of the pivot bearing region. For this purpose, these bearing portions are preferably curved over part of a circle and are matched with corresponding part-circle curvatures of end faces of the pivot bearing region.

The terminal housing part and/or the cover part here preferably have part-circle bearing cavities for pivotably mounting the actuation element in the insulating material housing. A part-circle outer periphery of the pivot-bearing region matched accordingly with the part-circle bearing cavity then enters an associated bearing cavity.

It is particularly advantageous when the actuation portions have a part-circle outer periphery with a V-shaped incision for forming a step protruding in the direction of the center of the actuation portion. The at least one spring-loaded clamping connection in each case has a bus bar portion and a clamping spring with an actuation tab. The actuation tab of the clamping spring rests on the step as the actuation element is pivoted in order to open a clamping point formed between a clamping edge of the clamping spring and the bus bar portion for clamping an electrical conductor.

With the aid of such a step, which is adjoined by a free space arranged thereabove, a stable support for an actuation tab of the clamping spring is created, such that the spring actuation force is transmitted optimally via the step to the clamping tab of the clamping spring. Due to the step protruding in the direction of the center of the actuation portion, a free space arranged thereabove is provided, such that the clamping spring otherwise may lift freely from the step, even without lever actuation, in order to exert a spring clamping force on the electrical conductor in a manner uninfluenced by the lever arm.

The side wall portions of an actuation element are preferably connected to one another by means of a transverse web formed in such a way that the transverse web, in the state in which the actuation element is pivoted up, in which state the clamping point is open, extends from the free end of the side wall portions to the insulating material housing. An optimal stability of the lever arm in particular in view of the resistance to twisting and resistance to bending is thus achieved with utilization of the available installation space.

The transverse web preferably protrudes beyond the free end of the side wall portions opposite the pivot bearing region. An attachment for grasping the transverse web and exerting a lever pivot force is thus provided. Due to the protruding end of the transverse web, the lever arm can be better grasped by hand or can be grasped from below by means of a screwdriver in order to be opened.

The conductor terminal is preferably embodied as a transverse connection terminal, such as a box terminal, in which two or more spring-loaded clamping connections are accommodated adjacently in the insulating material housing, wherein the spring-loaded clamping connections have a common bus bar. An electrical conductor connected to a spring-loaded clamping connection is thus connected electrically conductively to further electrical conductors, which are connected to the other spring-loaded clamping connections.

Such a box terminal is extremely compact and can be integrated advantageously in distributor boxes of electrical installations. With the aid of the actuation lever, a simple clamping and removal of electrical conductors is possible for a large range of conductor cross sections. A conductor terminal of this type can therefore be used not only for energy distribution installations, but also for communication technology installations.

A very stable mounting of the actuation elements in the insulating material housing can be achieved when the pivot bearing regions are mounted on a portion of a bus bar of the associated spring-loaded clamping connection. Here, the generally very stable, solid bus bar forms a support for the actuation element, such that the bus bars with the associated clamping spring and the actuation element are substantially self-supporting with regard to the effects of force and moments, without relatively large forces and moments acting on the insulating material housing in the event of actuation of the spring-loaded clamping connection by pivoting of the actuation element.

It is also advantageous when the external contours of the actuation portions lie in the space between the plane spanned by a bus bar of the associated spring-loaded clamping connection and a plane spanned by a contact limb of the associated spring-loaded clamping connection. This enables a very compact construction with optimal force effect of the actuation element on the spring-loaded clamping connection.

In the figures like reference signs are used for elements corresponding to one another.

DETAILED DESCRIPTION OF THE INVENTION

FIG. 1shows a perspective view of a first embodiment of a conductor terminal1. The conductor terminal has an insulating material housing2with adjacently arranged conductor insertion openings3introduced into the insulating material housing from the front. A spring-loaded clamping connection (not visible) arranged in the insulating material housing2and associated with a conductor insertion opening3is accessible via each of the conductor insertion openings3. When inserting an electrical conductor into a conductor insertion opening3, said conductor can be clamped electrically conductively and in a mechanically secured manner at the associated spring-loaded clamping connection.

An actuation element4is arranged above a respective conductor insertion opening. The actuation elements4are each mounted in the insulating material housing2so as to be pivotable about an axis of rotation. They have a transverse web5at the free end, which, as illustrated, lies in the closed position within the volume formed by the insulating material housing2. The transverse webs5of the actuation elements4preferably terminate flush with the plane spanned by the upper edge6of the insulating material housing2.

It is clear that the transverse webs5at a free end have a protruding bead7, which facilitates the grasping of the actuation element4by hand or a screwdriver in order to apply a lever pivot force to the actuation element4, from bottom to top in the viewing direction, and to therefore pivot said actuation element.

The transverse web5of an actuation element4connects two mutually distanced side wall portions8a,8bin order to form an actuation lever that is U-shaped in section in principle. The free space40between two side wall portions8a,8band bordering the transverse web5is filled in the closed position by a raised portion9of the insulating material housing2. The free space40is thus used to accommodate insulating material in order to thus achieve a compact design of the conductor terminal1.

It can also be seen that an inspection opening10open at the end face is provided above the middle conductor insertion opening. An inspection tool, such as a measuring pin or a screwdriver with inspection light for measuring the voltage potential at the spring-loaded clamping connection arranged therebehind can thus be inserted into the inspection opening10.

FIG. 2shows a cross-sectional view through the conductor terminal1fromFIG. 1. It is clear that the actuation elements4are U-shaped in cross section by the mutually distanced side walls8a,8band the transverse web5connecting said side walls. It is clear that the side wall portions8a,8bin the closed position enter a respective intermediate space Z between the raised portion9of the insulating material housing and either an adjacent raised portion or, for the edge regions, the side wall of the insulating material housing2. This leads to an optimized side guidance of the actuation elements4, which are therefore mounted not only at the visible rotary bearing. In the illustrated exemplary embodiment two side wall portions8a,8bof adjacent actuation elements4border one another and enter a common intermediate space Z, so that the side wall portions8a,8bof the adjacent actuation elements4guide one another mutually. Installation space in the width direction is saved due to the omission of a further intermediate wall between two adjacent side wall portions8a,8b.

FIG. 3shows a side sectional view through the conductor terminal1fromFIG. 1with open actuation element4.

It can be seen that a spring-loaded clamping connection11together with an associated actuation element4is installed in the insulating material2. Here, the insulating material housing2is formed in two parts and has a terminal housing part12and a cover part13. Following insertion of the actuation element4and of the spring-loaded camping connection11into the terminal housing part2, this is closed by the cover part13. Here, a pivot bearing region14inter alia with a part-circle outer periphery is guided on part-circle bearing cavities15of the insulating material housing2in order to mount the pivot bearing region14pivotably about an axis of rotation D. The axis of rotation D is here a virtual axis of rotation, which is defined by the part-circle pivot bearing region14and the rotary mounting thereof in the insulating material housing2.

It can be seen that the pivot bearing region14has an actuation portion16for acting on a lateral portion of the clamping spring17of the spring clamping connection11. Here, the clamping spring17is formed from a contact limb18, an adjoining spring arc19, and a clamping limb20adjoining said spring arc. The clamping limb20has, at its free end, a clamping edge21, which together with a bus bar22of the spring-loaded clamping connection11forms a clamping point for clamping an electrical conductor.

It is clear that in the illustrated position of the actuation element4pivoted into the open position the clamping limb20is displaced away from the bus bar22arranged therebeneath in order to open the clamping point formed by the clamping edge21of the clamping spring17and the bus bar22. For this purpose the actuation portion16exerts a spring actuation force FF, which, as considered in the conductor insertion direction L, lies in front of the axis of rotation and is directed upwardly from the bus bar22in the direction of the free end of the actuation element in the open position. In the illustrated exemplary embodiment the bus bar22is provided with a frame portion23, which is formed integrally therewith and which is directed upwardly from the plane of the bus bar22in the extension direction of the attached actuation element4and of the contact limb17. A conductor feedthrough opening is formed in the frame part23by two mutually distanced side webs and by a retaining web24connecting the side webs at the free end. The contact limb18engages the retaining web24from below and is secured in the retaining web24by a slight curvature. A self-supporting spring-loaded clamping connection11is thus created, with which the clamping spring17is arranged on the bus bar22and a force acting on the clamping limb20is returned to the bus bar22via the contact limb17. When clamping an electrical conductor, the clamping limb20exerts a force onto the bus bar22, which counteracts the retaining force of the contact limb18at the retaining web24, such that the two forces are compensated for to the greatest possible extent.

It is clear that the pivot bearing region14is supported opposite the clamping limb20on the bus bar22, is guided on the bearing cavities15of the insulating material housing2by means of a part-circle outer periphery, and additionally is mounted in the rear region opposite the bearing cavities15on the side webs of the frame part23. It is thus ensured that the actuation forces exerted by the pivot lever are received in a self-supporting manner without exertion of considerable deformation forces on the insulating material housing.

FIG. 4shows a side sectional view of the conductor terminal1fromFIGS. 1 to 3. Here, the actuation element4is located in the closed position, in which the actuation element4is pivoted via its transverse web5in the direction of the insulating material housing2and a clamping point formed by the spring force clamping connection11for clamping an electrical conductor is closed. Here, the clamping edge21of the clamping limb20rests on the bus bar22without electrical conductor, preferably under spring force of the clamping spring17.

In order to now open the clamping point, a lever actuation force FH has to be exerted onto the lever arm formed by the side webs8aand the trans verse web5. This actuation force FH is directed upwardly in the illustration from the plane of the bus bar22in the direction of clamping springs17arranged thereabove. In the event of a resultant pivot of the actuation element4in the clockwise direction in the illustration, a spring actuation force FF is exerted by the actuation portion16onto the clamping limb20. This spring actuation force FF is also directed upwardly, i.e. from the bus bar22in the direction of the extension direction of the actuation element4in the open position (seeFIG. 3). The extent to which the spring actuation force FF and the lever pivot force FH run here at a certain identical or different angle is irrelevant.

It can be seen that, from the closed position according toFIG. 4in the transition to the open position according toFIG. 3, the lever pivot force FH and spring actuation force FF are not only both directed in the same direction, i.e. upwardly independently of their specific angle, but also lie on the same side relative to axis of rotation D as considered in the conductor insertion direction L. The actuation element4therefore does not form a lever arm with which, by means of a lever pivot force on one side of the axis of rotation, a spring actuation force FF is exerted on the other opposite side of the axis of rotation D. Rather, the lever pivot force FH and the spring actuation force FF act on the same side relative to the axis of rotation D.

It is also clear fromFIG. 4that the spring-loaded clamping connection11enters partially into the space delimited laterally by the side wall portions8a,8band the transverse web5, such that the overall height of the conductor terminal1is relatively low in spite of the actuation element4. It is also clear that a portion9of the insulating material housing2located above the spring-loaded clamping connection11enters a free space40of the actuation element4bordering the transverse web5. This free space40is thus also used to accommodate parts of the insulating material housing in order to enable a compact design.

In the closed position of the actuation element4this is latched by a detent lug42, protruding from the transverse web5, on an associated detent contour43of the insulating material housing2. In the closed position the actuation element4is not loaded by force by the clamping spring17and is thus stabilized in terms of position. An uncontrolled wobbling motion of the actuation element4is thus prevented by the latched connection.

FIG. 5shows a perspective view of the terminal housing part12of the insulating material housing2of the above-described conductor terminal1. Dovetail-like recesses26are formed in the side walls25of the insulating material housing2, into which recesses dovetail-like protrusions of an associated cover part13matched to said recesses enter in order to prevent a widening of the insulating material housing2under load. The latched connection between terminal housing part12and cover part13is provided via detent elements (not illustrated in greater detail).

It is also clear that guide webs27and bearing cavities15with end faces28that are curved over part of a circle are formed in the interior of the terminal housing part12. With the aid of these end faces28that are curved over part of a circle and that are each combined with a bearing cavity15, a pivot bearing of an associated pivot bearing region14relative to an actuation element4is provided. The guide webs27enter a guide slot30(seeFIG. 7), which is provided between the inner wall of a side wall portion8a,8band an actuation portion16distanced therefrom. The guide webs27are additionally also used to stabilize the terminal housing part12.

FIG. 6shows a rear view of the terminal housing part12fromFIG. 5. Here, it is clear that the end-face central inspection opening10is open not only on the front side, as can be seen inFIG. 1, but also toward the interior. A spring-loaded clamping connection11formed in the interior of the terminal housing part12is thus accessible for an inspection tool in order to check whether electrical voltage potential is present at the spring-loaded clamping connection11in question.

It is also clear fromFIG. 6that an intermediate space Z, in which the side wall portions8a,8bof the incorporated actuation elements4enter, is provided in each case in the intermediate space between adjacent guide webs27of bordering mounting spaces for spring-loaded clamping connections11.

FIG. 7shows a perspective view of an actuation element3in the form of an actuation lever from the underside. From this, the embodiment, which is U-shaped in section in principle, with two mutually distanced side wall portions8a,8bcan be seen, which at their free end are connected to one another via a side edge by means of a transverse web5. It is clear that the side wall portions8a,8btaper from the pivot bearing regions14to the free end. It can be seen that an actuation bead7is provided at the free end of the transverse web5. It is also clear that the transverse web5with the actuation bead7protrudes forwards beyond the free ends of the side wall portions8a,8b, wherein the inner sides of the transverse web5are inclined at the free end edge. Any slipping when applying a lever actuation force of the actuation element4is thus counteracted.

It can also be seen that the pivot bearing regions14have outer end faces29curved over part of a circle, by means of which the actuation element4is mounted in the insulating material housing so as to be pivotable about a virtual axis of rotation D.

The axis of rotation D extends through the center of a part circle formed by the outer end face29.

It can also be seen that part-circle portions31distanced from the side wall portions8a,8bin the pivot bearing region14via a guide slot30are arranged with a V-shaped incision32. An actuation portion16is formed in the region of each V-shaped incision32and is used to apply a spring actuation force to an associated clamping limb20of a clamping spring17. It can be seen that the actuation portions16, as well as the transverse web5, onto which a lever pivot force FH is exerted, lie on the same side relative to the axis of rotation D. As a result, the spring actuation forces FF exerted via the actuation portions16act on the same side relative to the axis of rotation D as the lever pivot force FH applied to the transverse web5in order to provide a pivot motion.

It is additionally clear that a latching lug42protrudes approximately in the direction of the pivot bearing region14and the portion31from the transverse web5on the side opposite the actuation bead7. The latching lug42is used to latch the actuation element4in the closed position with the insulating material housing2.

FIG. 8shows a side sectional view through the actuation element4fromFIG. 7. Here, it is again clear that the side wall portions8a,8bare connected by a transverse web5connecting them on the upper side of the actuation element4. The transverse web5extends here only over part of the length of the side wall portions8a,8band preferably occupies more than half of the length of the side wall portions8a,8b.

FIG. 9shows a longitudinal sectional view through a conductor terminal1in plan view, in which it is clear that the mutually distanced side wall portions8a,8bof the respective actuation lever4enter intermediate spaces Z of the insulating material housing2and are guided there by wall portions of the insulating material housing2and where applicable by bordering side wall portions8a,8bof adjacent actuation elements4. It is clear here that a guide web27of the insulating material housing2enters the guide slot30between a side wall portion8a,8band a bordering portion31with the actuation portion16. A pivot bearing guidance is therefore created for the actuation element4and also holds this laterally against tilting or twisting.

It can also be seen that the portions31with the actuation portions16overlap the clamping spring17in the width direction and cooperate with edge regions of the associated clamping spring17or clamping limb20thereof in order to exert a spring actuation force FF onto the clamping limb20. A guide web27then adjoins the outer edges of the clamping spring17and of the actuation portions16and enters the guide slot30of the actuation element4. The intermediate space Z bordering hereon is then intended to accommodate part of a side wall portion8a,8bof the actuation element4. The actuation portions16are connected integrally to the side wall portions8a,8bvia the portion31.

FIG. 10shows a longitudinal sectional view through the conductor terminal1fromFIGS. 1 and 9approximately in line with the axis of an inserted electrical conductor33. The electrical conductor33has a stripped free end34, which is electrically conductively connected at a clamping point by means of the clamping spring17to the electrically conductive bus bar22arranged therebeneath. The bus bar22extends here transversely to the direction of connection, i.e. beyond the three adjacently arranged spring-loaded clamping connections11, in order to thus enable a transverse distribution of the electrical potential at the electrical conductor33.

It is clear from this sectional view that pivot bearing regions14border the connection space for the electrical conductors33laterally, the portions31having actuation portions16. The actuation portions16of adjacent pivot bearing regions14for the same spring-loaded clamping connection and the same conductor insertion opening3are distanced from one another to a shorter extent than the side wall portions8a,8b, on which the actuation portions16are formed integrally. A guide slot30is located between the actuation portions16and the side wall portions8,8b. The pivot bearing regions14and/or the actuation portions16here guide the electrical conductor33or stripped end thereof to the clamping point.

It is also clear that the frame parts23protruding from the bus bar26each have two edge webs35distanced from one another, of which the intermediate space serves as a conductor feedthrough opening for feeding through the stripped end34of an electrical conductor33.

It can also be seen that the spring-loaded clamping connections11are fixed by the cover part13in the terminal housing part12in such a way that webs36of the cover part contact the edge webs35of the frame parts23and thus fix the position. The terminal housing part12has wall portions37made of insulating material with part-circle end faces, which contact the portions31, curved over part of a circle, of the pivot bearing regions14with the actuation portions16and for this purpose form a part-circle bearing cavity.

It is advantageous when the insulating material housing2or at least parts or portions thereof is/are formed from transparent plastic material in order to be able to thus identify externally whether the stripped free end34of an electrical conductor33is correctly inserted.

FIG. 11shows a side sectional view of a second embodiment of a conductor terminal1when the actuation element4is opened in the open state. Here as well the insulating material housing2is formed in two parts from a terminal housing part12and a cover part13introduced thereinto and latched with the terminal housing part12. In this embodiment the pivot bearing region14has a first at least part-circle bearing region37, which is adjoined by the actuation portion16in the direction of the conductor terminal space offset from the portion31. It is clear that this portion31with the actuation portion16has a larger diameter than the part-circle bearing portion37. The portion31with the actuation portion16thus protrudes radially relative to the rotary bearing portion37. The actuation element4can then be mounted on the rotary bearing region37by suitably matched part-circle bearing cavities of the insulating material housing2, and where applicable can also be mounted on the larger part-circle portion31by the insulating material housing. The pivot bearing and resistance to tilting with reduced loading of the insulating material housing material is thus improved also in conjunction with the protrusion, which may be bordered laterally by an insulating material housing wall for guidance.

With this embodiment as well the spring actuation force FF of the actuation portion16acts on actuation tabs38, protruding from the clamping spring, on the same side of the axis of rotation D and in the same direction as a lever pivot force FH to be applied to the free end of the actuation element4in order to pivot the actuation element4from the closed position according toFIG. 12into the illustrated open position ofFIG. 11.

Both forces, i.e. the lever pivot force FH and the spring actuation force FF are directed here upwardly in the same direction, i.e. away from the bus bar22in the extension direction of the actuation element4in the open position irrespective of the exact angular position.

The conductor terminal1may have an inspection opening39in the insulating material housing2, which inspection opening is accessible from above in the rear region.