EP0279916A2 - Connection terminal device, in particular for inductances or transformers - Google Patents

Abstract

A connection terminal device, in particular for inductances or transformers, has a terminal housing (7), consisting of dielectric material and provided with cut-outs (14, 15) for connecting wires, and at least one metallic terminal insert (23), inserted in the terminal housing, which is designed as a screw terminal. On a base of the terminal insert there are located two terminal limbs (30), arranged running at a distance from one another, which carry at least two blade contacts (34), pointing towards one another, by means of which at least one slot-like opening (32), open at the edges, is limited, the width of the said opening being less than the diameter of a connecting wire (35) to be retained. In addition, the terminal housing is placed on a lower part (41) of dielectric material, covering at least the terminal insert, the terminal insert being inserted into the terminal housing, sealed with a part forming a terminal body. <IMAGE>

Description

The invention relates to a terminal device, in particular for reactors or transformers, with a terminal housing made of insulating material, which has cutouts for connecting wires, and with at least one metallic terminal insert inserted into the terminal housing, which as a screw terminal arranged in a solid terminal body for receiving Connection wires serving connection bore and a clamping screw which can be screwed into a corresponding threaded bore leading into the connection bore is formed.

For example, chokes or small transformers serving as ballasts for gas discharge lamps are provided by the manufacturer with a clamping device which enables a connection of the outer connecting wires to the winding ends. Since such chokes and small transformers are mass products that are manufactured in large numbers with increasing use of automatic work processes, the rational manufacturing and assembly options of the clamping device are of considerable importance. On the other hand, an electrically flawless, reliable connection between the outer connecting wires and the winding ends must be guaranteed in any case.

From DE-PS 22 44 158 a choke is preferably known as a ballast for gas discharge lamps, in which the clamping device is designed in the manner of a luster terminal, which is fastened on a mounting rail carrying the laminated core. The arrangement is such that the winding heads of the inductor are covered by one-piece insulating material housings which lie against the magnetic core and which are fastened to the laminated core by means of a molded tongue which is pushed into the space between the magnetic core and the respective winding end and which are attached to the core Wear shaped tube pieces on the opposite outer wall, slotted at the bottom, on which cable end sleeves are attached by crushing, which tightly enclose the ends of the winding wires. The luster terminal is pushed on one side onto these cable end sleeves and clamped with them via the assigned clamping screws. The position of the luster terminal can be fixed to the housing by a nose.

This design of the connection terminal device is relatively expensive and time-consuming because of the cable end sleeves to be crimped onto the pipe pieces mentioned and the luster terminal to be installed specifically. Also, the luster terminal arranged in front of the associated winding head insulating cap-like housing necessarily extends the overall length of the entire device, which is undesirable for a number of applications, such as when such a choke must be accommodated as a ballast for a gas discharge lamp in a lamp.

Substantially more favorable conditions with regard to an enlargement of the external dimensions of the entire device caused by the connecting terminal device and the inexpensive manufacture with simple assembly result in a choke or a small transformer, as is known from DE-PS 33 09 108. In this case, the connecting terminal part is formed in a strip-like manner with two block-like clamping elements connected to one another by a thin web, the clamping elements having the connecting terminals being arranged in the lateral areas adjacent to the outer wall of a housing-like molded insulating part covering the associated winding head with a web extending over the outer wall thereof. The terminal part can be locked with the molded insulating part or a cover cap. Since the terminals are designed as screw terminals with a solid metal terminal body with through connection bores and with clamping screws for the winding leads inserted into the connection bores, the assembly of this clamping device for mass production of the chokes is still complex. Namely, the connection wires of the windings, ie the winding ends, must first be threaded into the assigned connection bores of the screw terminals before the connection terminal part can be assembled and the clamping screws assigned to the winding ends can be tightened. In addition, the assembly of the terminal part is only possible after impregnation of the choke or the transformer, because otherwise the clamping screws used for the connection of the outer connecting wires stick together and can therefore no longer be operated.

In contrast, an assembly of the electrical terminal device before impregnation allows. Via a throttle known from DD-PS 103 087, in which insulating caps are used for the insulation of the winding heads, which are anchored by means of a molded tongue in the space between the winding head and the laminated core. The insulating cap is extended in the longitudinal direction of the device by an additional chamber in which electrical connection elements are accommodated, which are exposed after the impregnation and surface coating by removing covers molded onto the cap. The covers protect the metallic connecting elements, which are designed as screw terminals, against sticking through the impregnation material. The connection of the winding ends to the connection elements is not easy because the connection wires have to be threaded into the connection bores of the connection elements lying in the depth of their assigned chamber and clamped there, unless the connection elements would only be connected to the winding ends after the connection Chamber pressed in. However, this would be of little use considering the risk of damage to the thin winding wires.

In addition, the chamber of the cover cap which receives the connection elements and which is arranged upstream of the winding head increases the overall axial length of the entire device.

Finally, in connection technology, screwless terminals in various configurations are also used. For example, in a connecting or connecting terminal for electrical conductors known from DE-OS 31 12 969 are in an insulating body a busbar and at least one clamp spring slidably mounted in the manner of a plunger, which contacts the busbar and, in an advanced position with two U-shaped clamping legs, grips and contacts an electrical conductor in a fork-shaped manner, the electrical conductor in a conductor bed surrounding the conductor on all sides is guided, which is formed on both sides adjacent to the plunger spring. Such a connecting or connecting terminal is not readily usable as a connecting terminal device for a choke or a small transformer because it is not suitable for being integrated with the device into a compact structural unit. A connection of the relatively thin winding wires to the outer connecting wires, which have a much larger diameter, is often not readily possible.

This also applies to a screwless connecting clamp of this type known from US-PS 2501 187, which has an essentially hollow cylindrical metallic clamp body, the jacket of which is slotted on the side, so that there are two approximately partially cylindrical clamping legs which have two open, slot-like openings between them limit. Inside the hollow cylindrical clamp body, knife edges are arranged, which delimit slots, the width of which is smaller than the diameter of a connecting wire to be received, in such a way that when a lacquer-insulated connecting wire is pressed in, the lacquer insulation is cut open and flawless electrical contacting is produced without prior stripping of the conductor ends being necessary. The metallic terminal body is not insulated on the outside and, for this reason alone, cannot be used in this form as a connection device for a ballast or a transformer.

Based on this prior art, the invention has for its object to provide a terminal device, in particular for reactors or small transformers, which allows a particularly short, compact design of the equipment equipped with such a terminal device with simple manufacture and time-saving installation.

To solve this problem, the above-mentioned terminal device according to the invention is characterized in that the clamping insert has two spaced-apart clamping legs on a bottom side, which carry at least two mutually facing knife contacts, through which at least one edge-open, slot-like opening is limited, the width of which is smaller than the diameter of a connecting wire to be accommodated is that the terminal housing is placed on a lower part of insulating material covering at least the terminal insert, and that the terminal insert is inserted tightly into the terminal housing with its terminal body towards the terminal screw.

With this connection technology, the associated are when the terminal housing is placed on the lower part The connection wires of the winding are automatically stripped and properly contacted. Since the normal, common screw terminal connection is available for the outer connecting wires, the finished device can be installed in use in the conventional manner. The connection points and connection means of the relatively thin winding wires and the generally much thicker outer connection wires on the metallic terminal body are separated from one another; they can therefore be designed with a view to achieving optimum connection conditions for the winding wires or the outer connection wires. Since the clamping insert with its clamping body is inserted tightly into the terminal housing towards the clamping screw, no liquid impregnating agent can penetrate from the interior of the terminal housing to the clamping screw and stick it together when impregnated. Finally, the terminal housing, which can be simply plugged onto a lower part and contains the clamping insert, allows an optimal adaptation to the respective spatial conditions of the choke or the transformer, so that the terminal device is particularly suitable for a compact, fully integrated connection technology to achieve designs of particularly short overall length.

The slot-like opening delimited by the knife contacts of the clamping insert can advantageously have a length exceeding the diameter of a plurality of connecting wires by appropriately dimensioning the clamping legs and thus immediately take on the task of producing switching connections, while the solid clamping body also at least two intersecting connection bores can be formed in order to enable an optional connection of the outer connection wires from two different directions.

In addition, in a preferred embodiment, the arrangement can be such that the bottom region of the clamping body carrying the clamping limbs is essentially rigid and the other wall regions delimiting the connection bore (s) are designed to be elastically deformable, such that the tightened clamping screw with elongated deformation of the connection bore (s) and essentially undeformed floor area is pre-stressed by the elastically deformed wall areas. On the one hand, this bias compensates for any shrinkage of the clamped connecting conductor; on the other hand, the rigid design of the base area prevents undesirable spreading of the clamping legs when the clamping screw is tightened.

Simple manufacturing relationships result if the terminal housing has at least one chamber into which the terminal body is fitted in a vacuum-tight manner. Basically, however, embodiments are also conceivable in which the terminal body is glued or cast with surrounding wall parts of the terminal housing or was injected or molded directly into the plastic terminal housing during manufacture.

To prevent impregnation of the throttle with fully assembled connecting device coming from the outside insulating material jammed the clamping screw, it is expedient that the terminal housing has a molded-on cover receiving the clamping screw, which can be opened after inserting the clamping insert and then after impregnation. For similar reasons, recesses in the terminal housing, which are intended for connecting wires, leading to the connecting bore or the connecting bores of the clamping insert can be closed when the clamping insert is inserted and only opened after the impregnation.

A particularly secure insertion of the connecting wires between the knife contacts and a stable, positionally stable mounting of the inserted connecting wires allows an advantageous embodiment in which the lower part has at least one support for the connecting wires which projects between the clamping legs when the terminal housing is fitted. This edition is designed depending on the design of the clamping leg. If, as is expedient, the clamping limbs are partially cylindrical and enclose a channel-like elongated recess, into which at least one slot-like opening opens and which is optionally cylindrical, the support can be formed on the lower part in the manner of a protruding into the channel-like recess Be formed pin.

The terminal housing and the lower part can also advantageously have latching means, by means of which they can be locked together, so that there is a particularly simple assembly option.

Since the connecting wires lying between the clamping legs of the clamping insert are automatically stripped and contacted when the terminal housing is placed on the lower part, there is in particular when the connecting terminal device is then impregnated together with the device so that it can no longer be opened. to be able to check before impregnation whether there is a perfect electrical connection between the connecting wires and the clamping insert. For this purpose, the terminal housing and / or the lower part can have cutouts through which the terminal insert can be brought into contact with a contact piece from the outside when the terminal housing is joined to the lower part.

In a particularly expedient embodiment, the terminal housing and / or the lower part are part of the winding insulation or of a coil body of the choke or of the transformer. A construction that is particularly favorable with regard to the overall length also results if the terminal housing or the lower part is designed as a cap-like housing for at least partially covering a winding head of the choke or the transformer, which has a fastening device and, if appropriate, a molded tongue that extends into a space can be inserted between the winding head and the laminated core of the choke or the transformer.

In this case, the cap-like housing forming the lower part can be closed off on the side facing the free end of the tongue by the attached terminal housing, so that there is no increase in the overall length of the entire device. In addition, the terminal housing can have a receptacle for an electrical switching element, for example a fuse element or an overtemperature monitor, which can be closed by an attached lid and into which inlets for connecting wires open. A very compact design results if the receiving space between the clamping inserts is arranged on a narrow side of the terminal housing.

The new terminal device is especially designed for chokes or small transformers. In principle, however, it can also be used for other electrical devices in which similar requirements are placed on the connection technology as is possible to design such a connection terminal device as a separate clamping part, the terminal housing and the associated lower part then, for example, as an elongated cross section rectangular strip-like elements are designed, for example are stacked one on top of the other.

• Fig. 1 eine Drossel in Kompaktbauweise, mit inte­grierter Anschlußklemmeinrichtung gemäß der Erfindung, in perspektivischer Darstellung,
• Fig. 2 die Drossel nach Fig. 1, in einer Draufsicht,
• Fig. 3 die Anschlußklemmeinrichtung der Drossel nach Fig. 1, in einer perspektivischen auseinander­gezogenen Darstellung,
• Fig. 4 das das Unterteil der Anschlußklemmeinrichtung nach Fig. 3 bildende Wickelkopf-Abdeckgehäuse der Anordnung nach Fig. 3, in einer Seitenan­sicht, teilweise aufgeschnitten,
• Fig. 5 das Gehäuse nach Fig. 4, in einer Draufsicht,
• Fig. 6 das Gehäuse nach Fig. 4, in einer anderen Seiten­ansicht,
• Fig. 7 das Klemmengehäuse der Anschlußklemmeinrichtung nach Fig. 3, in einer Ansicht von unten,
• Fig. 8 das Klemmengehäuse der Anschlußklemmeinrichtung nach Fig. 3, geschnitten längs der Linie VIII-­VIII der Fig. 3, in einer Seitenansicht und im Ausschnitt, unter Veranschaulichung eines Klemm­einsatzes, und
• Fig. 9 den Klemmeinsatz nach Fig. 8, in der Zuordnung zu der Anschlußdraht-Auflage des Unterteils, in einem anderen Maßstab und in einer Seitenansicht.

In the drawing, an embodiment of the object of the invention is shown. Show it:

• 1 is a choke in a compact design, with an integrated terminal device according to the invention, in a perspective view,
• 2 the throttle according to FIG. 1, in a plan view,
• 3 shows the connection clamping device of the throttle according to FIG. 1, in a perspective exploded view,
• 4 the winding head cover housing of the arrangement according to FIG. 3 forming the lower part of the terminal device according to FIG. 3, in a side view, partially cut away,
• 5 shows the housing according to FIG. 4, in a top view,
• 6 shows the housing according to FIG. 4, in a different side view,
• 7, the terminal housing of the terminal device according to FIG. 3, in a view from below,
• Fig. 8, the terminal housing of the terminal device according to Fig. 3, cut along the line VIII-VIII of Fig. 3, in a side view and in detail, illustrating a clamping insert, and
• Fig. 9 shows the clamping insert according to Fig. 8, in the assignment to the connecting wire support of the lower part, on a different scale and in a side view.

The choke shown in Fig. 1,2, which can also be designed as a transformer, is particularly intended for use as a ballast for gas discharge lamps. It has a relatively short block-like laminated core 1 in a U / T or E / I section, the U legs of which are held together by a clamp 2. The winding overhangs not shown laterally above the laminated core 1 are each covered on both sides of the laminated core 1 by a cap-like housing 3 made of insulating material, which has an essentially U-shaped cross-sectional shape and has an integrally formed, flat edge flange 4 surrounding it on three sides with which it bears against the laminated core 1. In the plane of the edge flange 4, a tongue 5 (FIG. 3) is formed on the open back of the housing, which is inserted into the space between the winding head and the laminated core 1 and thus fixes the housing 3 to the laminated core 1. The tongue 5 thus forms a fastening device for the housing 3 and at the same time the insulation of the winding head against the laminated core 1.

In the described insulation of the winding head, which forms part of the winding insulation, an electrical connection terminal device 6 is integrated, which allows an electrical connection to be made between the winding wires and the outer connection wires. This terminal device 6 has an essentially rectangular, box-like terminal housing 7, which is formed from insulating material (plastic material) and from a flat front wall 8 there are two narrow side walls 9 and an upper cover wall 10. The terminal housing 7, which is open towards the rear (FIGS. 7, 8), has a trough-like receiving space 13 for an electrical component, for example a securing element, lying above the top wall 10 and delimited by the elongated front wall 8 and side wall parts 11 and a rear wall 12 , on whose feed lines can be inserted into the receiving space 13 through open-edge slot-like recesses 14, 15 (FIG. 3). To close the receiving space 13, a cover 16 is used, which can be locked by means of molded-on locking fingers 17 with locking recesses 18 on the inside of the side wall parts 11.

In the two corners between the front wall 8 and the side walls 9 in the interior of the terminal housing 7 are formed by wall parts 19 delimited, in cross-section essentially rectangular chambers 20, each of which has a cylindrical opening 21 in the top wall 10 in one on the outside formed on the top wall frustoconical cover cap 22. As can be seen in particular from FIG. 3, the two cover caps 22, like the chambers 20, are located laterally next to the receiving space 13 near the side walls 9 of the terminal housing 7, the projecting cover wall 10 forming a type of console.

In each of the two chambers 20, a clamping insert 23, for example made of brass, is inserted in a vacuum-tight manner from the inside of the terminal housing 7. The structure of the clamping inserts 23 is particular 3 and 9:

Each clamping insert 23 has a solid clamping body 24, which is essentially rectangular in cross section and adapted to the inner contour shape of the chamber 20, in which two intersecting connecting bores 25 are formed for external connecting lines, not shown in any more detail. A threaded bore 26 into which a clamping screw 27 is screwed opens into the two connection bores 25 in the region of their crossing point. On the bottom side 28 of the clamp body 24 opposite the clamp screw 27 of the clamp insert 23, which is designed in the manner of a screw clamp, two spaced-apart clamp legs 30 are formed, which consist of a hollow cylindrical pin connected to the clamp body 24 by two arranged in the jacket, opposite one another slot-like, open-edge openings 32 are formed, which open into a cylindrical, coaxial bore, which forms a channel-like recess 33. The two clamping legs 30 thus have the shape of essentially cylindrical half-shells; At their edges delimiting the two slot-like openings 32 they carry knife contacts 34 which, in the manner shown in FIG. 9, are designed to run slightly wedge-like towards one another at least over part of the longitudinal extent of the slot-like openings 32. The width of each of the slot-like openings 32 is somewhat smaller than the diameter of a connecting wire indicated at 35, inserted between them. When pushing the clamping insert 23 on the lead 35 is therefore the insulation of which is cut open automatically by the knife contacts 34, so that a perfect contact is made between the conductor forming the connecting part 35, squeezed between the clamping legs 30 and the clamping legs 30 and thus the clamping insert 23.

The length of the clamping legs 30 can be selected such that, in contrast to the illustration in FIG. 9, several, in particular two or three connecting wires 35 lying one above the other can be stripped and contacted simultaneously in the manner described.

The terminal body 24 is formed with its connection bores 25 and the wall parts surrounding them in such a way that the bottom region 36 carrying the two clamping legs 30, which lies approximately below the broken line 37 (FIG. 9), acts in the manner of an essentially rigid plate. In contrast to this, the lateral wall areas 39 lying approximately to the side of the dashed lines 38 are dimensioned such that they are resiliently flexible when the clamping screw 27 is tightened, such that the connecting bore 25 assumes an oval cross-sectional shape which is exaggerated at 40 when the clamping screw 27 is tightened.

This design of the terminal body 24 ensures that the clamping screw 27 is under tension in the tightened state and thus automatically compensates for any shrinkage of the connecting wire lying in the connecting bore 25. At the same time However, the essentially rigid design of the base region 36 prevents the two clamping legs 30 from being spread apart when the clamping screw 27 is tightened and thus loosening contact with the constrained connecting wire 35.

The clamping insert 23 described is pressed with its clamping body 24 in a vacuum-tight manner into the corresponding chamber 20 of the terminal housing 7, the clamping screw 27 projecting into the cavity of the cover hood 22, as can be seen in particular from FIG. 8.

At the cross-section essentially U-shaped, the winding head covering in the manner already described covering 3, which is closed at the bottom by a bottom 400 (Fig. 5), a cross-sectionally rectangular, straight-edged partial housing 41 is formed above, the is delimited by a straight surface and has a front wall 42 and two side walls 43. The dimensions of the sub-housing 41 are selected such that the terminal housing 7 onto the sub-housing 41 forming a lower part from above, i.e. from the free end of the tongue 5 adjacent side, can be pushed so that it closes the housing 3 on this side. In the area of the side walls 43, latching lugs 44 are formed on the partial housing 41, which engage in corresponding latching recesses 45 (FIG. 3) of the terminal housing 7 when the terminal housing 7 is fitted and latch the two housings 41, 7 together.

In addition, there is a corresponding wall thickness in each having side walls 43 a molded vertical, cylindrical pin 46 (Fig. 5, 9) is provided, the diameter of which corresponds to the diameter of the cylindrical recess 33 of a clamping insert 23 with play and which is surrounded by an annular channel-like recess 47, which holds the two partially cylindrical clamping legs 30 of the clamping insert 23 is used. The pin 46 forms a receptacle for the connecting wire 35. For this purpose, it is provided with a transverse groove 48, to which groove-like depressions 49 (FIG. 5) in the respective side wall 43 connect, which serve to receive a connecting wire 35 .

When assembling the described terminal device 6, the cap-like housing 3 covering the winding head is first pushed with its tongue 5 onto the winding head. The connecting wires 35 of the winding coming from the coil are then inserted into the groove-like depressions 49 and the groove 48 of the pin 46 forming a connecting wire support via recesses 49 in the housing 3 (FIG. 6).

Then the terminal housing 7 equipped with clamping inserts 23 in the manner described is pushed onto the partial housing 41 from above until the locking lugs 44 engage in the locking recesses 45 and thus lock the terminal housing 7. In this slide-on movement, the two clamping legs 30 reach over the connecting wire 35, which is guided laterally in the groove 48 and is supported downward, in the manner of a fork, whereby the knife contacts 34 cut the enamel insulation and penetrate so deep into the wire material that a reliable contact is guaranteed.

In order to be able to check this contacting before the subsequent impregnation, a recess 50 is provided on the partial housing 41 forming the lower part in the region of the two side walls 43, which in cooperation with an associated recess 51 in the region of the side walls 9 and the front wall of the terminal housing 7 in the assembled state, contact of the terminal body 24 of the respective clamping insert 23 with an electrical test probe is permitted.

If the contact is correct after testing, this is impregnated in this way with the connection terminal device 6 integrated into the winding insulation to form a compact unit as a whole. Since the clamping inserts 23 with their clamping bodies 24 are pressed into the chambers 20 in a vacuum-tight manner and the clamping screws 27 lie in the cover hoods 22, the clamping inserts 23 cannot be impaired by the impregnating agent during this impregnation process. After the impregnating agent has hardened, the covering hoods 22 are cut off at the top, so that the clamping screws 27, which remain electrically insulated over their length, are accessible from the outside. At the same time, aligned recesses in the form of bores 53 (FIG. 1) are made in the side walls 9 and the front wall 8 of the clamping housing 7 with the connecting bores 25 of the clamping inserts 23.

If necessary, one or more electrical components, for example bimetallic or fuse elements, can now be inserted into the receiving space 13 and are electrically connected to connecting wires inserted through the cutouts 14, 15 or cutouts 54 (FIG. 7). After putting on the lid 16, the device is ready for operation. A trough-like projection 55 (FIG. 3) molded onto the inside of the cover 16 can at the same time be used to fix the electrical component in position in the receiving space 13.

If electrical components are used that cannot be affected by the impregnation process, they can also be installed before the impregnation. It is also conceivable that the cover 16 is omitted in individual cases.

In the foregoing, the invention has been described in connection with the special winding head insulation by the housing 3 of a choke or a transformer. In principle, however, it would also be conceivable to use the terminal device 6 in connection with other devices, for example in such a way that the partial housing 41 is molded onto a flange of a coil former of a small transformer, etc. Finally, it would also be conceivable that the terminal device 6, consisting of the terminal housing 7 equipped with the clamping inserts 23 and the part housing 41 forming the lower part, is used as an independent clamping device. In this case, the sub-housing 41 would possibly be a flat bottom wall and a rear wall closed, wherein in the walls of the terminal housing 7 and the partial housing 41 corresponding recesses for the lead wire insertion are to be provided.

Claims (21)

1. Terminal device, in particular for reactors or transformers, with a terminal housing made of insulating material, which has cutouts for connecting wires, and with at least one metallic terminal insert inserted into the terminal housing, which as a screw terminal arranged in a solid terminal body, for receiving connecting wires Connection bore and a clamping screw which can be screwed into a corresponding threaded bore leading into the connection bore, characterized in that the clamping insert (23) has on one bottom side (28) two clamping legs (30) which are arranged at a distance from one another and which have at least two mutually facing knife contacts ( 34), through which at least one edge-open slot-like opening (32) is limited, the width of which is smaller than the diameter of a connecting wire (35) to be accommodated, that the terminal housing (7) covers at least one terminal insert (23) the lower part (41) made of insulating material is fitted and that the clamping insert (23) with its clamping body (24) towards the clamping screw (27) is inserted tightly into the terminal housing (7). 2. Terminal device according to claim 1, characterized in that the slot-like opening (32) has a diameter exceeding the diameter of a plurality of connecting wires (35) to be accommodated. 3. Terminal device according to claim 1 or 2, characterized in that the solid terminal body (24) has at least two intersecting connecting bores (25). 4. Terminal device according to one of the preceding claims, characterized in that the clamping leg (30) bearing bottom region (36) of the terminal body (24) is essentially rigid and the other the connecting hole (s) (25) delimiting wall regions (39) elastically deformable are designed in such a way that the tightened clamping screw (27) can be set under tension by elongated deformation of the connection bore (s) (25) and essentially undeformed base region (36) by the elastically deformed wall regions (39). 5. Terminal device according to one of the preceding claims, characterized in that the terminal housing (7) has at least one chamber (20) into which the terminal body (24) is pressed in a vacuum-tight manner. 6. Terminal device according to one of the preceding claims, characterized in that the terminal housing (7) has an integrally formed, the clamping screw (27) receiving cover (22) which can be opened after inserting the clamping insert (23) and then after impregnation . 7. Terminal device according to one of the preceding claims, characterized in that to the connection bore (25) or the connection bores (25) of the clamping insert (23) leading recesses (53) for connecting wires of the terminal housing (7) when inserting the clamping insert (23) are closed and can be opened after impregnation. 8. Terminal device according to one of the preceding claims, characterized in that the lower part (41) has at least one with attached terminal housing (7) between the clamping legs (30) protruding support (46) for connecting wires (35). 9. Terminal device according to one of the preceding claims, characterized in that the clamping legs (30) are partially cylindrical. 10. Terminal device according to one of the preceding claims, characterized in that a channel-like elongate recess (33) is laterally enclosed by the clamping leg (30), into which at least one slot-like opening (32) opens. 11. Terminal device according to claim 10, characterized in that the channel-like recess (33) is cylindrical. 12. Terminal device according to claim 8 and one of claims 9 to 11, characterized in that the support is designed in the manner of a in the channel-like recess (33) projecting, on the lower part (41) molded pin (46). 13. Terminal device according to one of the preceding claims, characterized in that the terminal housing (7) and the lower part (41) have locking means (44, 45) by means of which they can be locked together. 14. Terminal device according to one of the preceding claims, characterized in that the terminal housing (7) and / or the lower part (41) has recesses (50, 51) through which the clamping insert (23) with the lower part (41) assembled terminal housing (7) can be brought into contact with a contact piece from the outside. 15. Terminal device according to one of the preceding claims, characterized in that the terminal housing (7) and / or the lower part (41) is part of the winding insulation (3, 4, 5) or a coil body of the choke or of the transformer. 16. Terminal device according to claim 15, characterized in that the terminal housing (7) or the lower part (41) is designed as a cap-like housing for at least partially covering a winding head of the choke or the transformer. 17. Terminal device according to claim 16, characterized in that the cap-like housing has an integrally formed tongue (5) which can be inserted into an intermediate space between the winding head and the laminated core (1) of the choke or of the transformer. 18. Terminal device according to claim 17, characterized in that the lower part (41) forming cap-like housing (3,41) on the free end of the tongue (5) facing side is completed by the attached terminal housing (7). 19. Terminal device according to one of the preceding claims, characterized in that the terminal housing (7), optionally by a cover (16) which can be closed, has a receiving space (13) for an electrical switching element, in the inlets (14, 15, 54) for connecting wires mind. 20. Terminal device according to claim 19, characterized in that the receiving space (13) between the clamping inserts (23) is arranged lying on a narrow side of the terminal housing (7). 21. Terminal device according to one of claims 16 to 20, characterized in that the terminal housing (7) at least on its front substantially flush with the front wall of the cap-like housing (3) or only slightly protruding beyond this.

Images