CN1125503C - Insulation piercing connecting device - Google Patents

Abstract

An insulation piercing connecting device for contacting a non-striped terminal of an electrical conductor. The opposite contact arms (3, 4) of the insulation piercing connecting device encompass a gap (5) for insulation piercing connection that is shaped in the form of an inverted Y. The edges (7, 8) of the head of the Y-shape delimiting an insertion hole (6) and forming a V-shape in relation to each other form a cutting area to pierce the conductor insulation. The edges (9, 10) of the base of the Y-shape that are substantially parallel in relation to each other form a clamping contact area (24). The edges (7, 8) of the head of the Y-shape are undulated in their longitudinal direction in the form of a knife for domestic use.

Description

Cut terminal

technical field

The invention relates to a cut-off terminal for contacting the end of an uninsulated electrical conductor, which has two contact legs, the side edges of which are opposite to each other, between which there is a A generally Y-shaped cut-type wiring gap, the top edge of which is V-shaped to each other at the Y-shaped gap and forms an insertion hole therebetween. The substantially parallel leg edges form a clamping contact area.

Background technique

In a cutting terminal made of a plate-shaped contact material disclosed in German Patent DE4403278A1, a wire clamping groove is formed between two contact legs, and the cutting edges facing each other extend parallel to each other. Based on the elastic contact material, two wires of different diameters can also be clamped in the contact area for double contact. However, the range of diameters of the wires to be contacted is limited by the geometry of the clamping grooves forming the contact area.

In addition, European patent EP0274948A1 discloses a cut-type terminal with a V-shaped contact area. Its cutting edge forms a circular arc-shaped contact area. The cutting legs are rigid and do not have any clamping action. When the wire is inserted by pressing along the narrowing direction of the V-shaped insertion area, the oppositely facing cutting edges of the cutting legs penetrate the insulation of the wire and reach the wire core. The clamping of the conductors in the contact area takes place by means of a lever arm. This known cutting-type terminal also has a limited scope of application for wires of different diameters.

German patent DE-U-9302765 discloses a cut-off terminal having a cut-off connection contact. The cut-off terminal contact consists of four cut-off terminals of identical construction, each terminal having a substantially rectangular leaf with two cut-off clamping arms including a V-shaped edge mouth area and a clamping groove of equal width connected to the cutting edge. The width of the clamping groove is adapted to the diameter of the conductor to be contacted. The contour of the V-shaped cutting edge area is suitable for maintaining the required cutting force and thus the lateral force exerted on the cutting clamp arm when cutting the conductor insulation to a minimum. This cut-off terminal cannot be used to contact wires of different diameters.

Contents of the invention

The object of the present invention is to create a cut-off terminal of the type mentioned at the outset, which enables electrical conductors of a type to be contacted over a large conductor cross-sectional area without having to remove the insulation. Here, the cross-sectional area of the wire is between 0.5 and 2.5 mm ² . Not only solid wires but also thin wires can be touched. Furthermore, it should be ensured that such terminals have a high tensile strength compared to screw clamps. Finally, the cutting terminal block can be installed and removed with a simple tool, such as a screwdriver.

The object of the present invention can be achieved by the following solution, a kind of cutting-type connection terminal for contacting the end of the electric wire that has not removed insulating layer, it has two contact legs, and the side edges of these two contact legs are opposite to each other, Between the two contact legs is a substantially Y-shaped cut-out wiring gap at which the top edge of a V-shape facing each other and forming an insertion hole therebetween constitutes a gap for penetrating wire insulation. The cutting area of the layer, and the substantially parallel leg edges at the Y-shaped gap form a clamping contact area, which is characterized in that a U-shaped base body is formed around the receiving space at the end of the wire, and its U-shaped leg passes through a U-shaped The bridges are connected to one another, wherein the U-shaped legs form the side walls of the main body, a side edge of which forms the contact leg, which acts in the manner of a spring clip.

According to the invention, the cut-off terminal has particularly good elasticity, so that it can be contacted with conductors of different diameters. By designing cutting terminal blocks in the manner of spring clamps, the cutting and/or clamping force can be controlled according to the wire cross-section. In addition, a special stop is provided which is substantially related to the outer diameter of the wire, and the stop can be of various types. This can be achieved by means of an embodiment of a "moving cutting terminal", in which the conductor is inserted into or mounted on a receiving device and the cutting terminal is moved relative to the conductor , in order to achieve contact. In this embodiment, a second connection can be formed solely for the connection terminal, which leads to a further conductor part, for example a switching contact of a control device. The closing pressure for the spring clamp action can be controlled according to the position of the wire. This is achieved by the contour of the line part and/or the connection terminal or also the contour of the surrounding housing.

However, it can also be realized in another embodiment of a "fixed cut-off terminal", in which the conductors are accommodated in a guide, for example a plastic part, and run in the terminal. With this embodiment, under certain circumstances, the tension of the cutting terminal when connected to the housing varies as a function of the travel distance of the conductor and thus the outer diameter of the conductor. Furthermore, the invention further describes the advantageous features of the cut-off terminal which facilitate the action of the spring clamp.

Cut-off terminals can consist of a plate-shaped elastic contact material.

According to the invention, the insulating layer of the conductor is penetrated in its effective cutting area. This is achieved in a particularly effective manner by means of a cutting edge with corrugated grooves (Wellenschliff), which exerts a pulsating force when contacting and inserting the unstripped conductor without acting excessively on the conductor core pressure and avoid the disadvantage of forming a cut on the wire. The actual clamping contact occurs in the clamping contact area formed between the two substantially parallel leg edges of the Y shape.

The present invention improves the efficacy of the corrugation shape of the cutting edge. The sharp angle of the cutting edge and its relief angle make the insertion of the wire easier. The invention also serves to facilitate the insertion of wires. According to one aspect of the invention, the orientation of the contact legs deviates from this in the clamping contact region. Consequently, the contact leg has an approximately barb-like shape in the clamping contact area, which increases the clamping force when the conductor is pulled outwards.

Through the inventive inclination of the contact leg (the plane delimiting the insertion opening) relative to the clamping contact groove, the conductor can be inserted into the receiving space of the connection terminal while penetrating the insulating layer. According to the invention, the design of the transition region between the insertion opening and the clamping contact groove further enables the insertion of a conductor. The invention can also have the effect of pressing the wire ends which are not insulated due to wire cutting against the contact stop, so that the contact stop forms an additional wire contact surface.

Expediently, the connection terminal is made of bimetal. Advantageously, it consists of a single, single-piece bimetal segment. For example, it is possible to combine the elasticity of steel with the conductivity of aluminum. If the contact point or the contact area is heated due to the high current density, the embodiment of the cutting terminal according to the invention does not cause a drop in the contact force and thus an increase in the contact resistance, but just the opposite . That is, the different thermal expansion coefficients of the bimetals, ie the bimetal effect, are advantageously exploited.

Description of drawings

Describe the present invention in detail below in conjunction with an embodiment shown in the accompanying drawing, in the accompanying drawing:

Fig. 1 is a perspective view of the cutting type terminal of the present invention,

Fig. 2 is a partial perspective view of the cut-type clamping groove area of the cut-type terminal shown in Fig. 1 shown from another direction,

Fig. 3 is a vertical sectional view viewed from the middle longitudinal plane of the cut-type terminal along line III-III in Fig. 1 .

Detailed ways

In order to make contact with the unstripped end of an electrical conductor, not shown, the cut-off terminal comprises two contact legs 3, 4 opposite with their side edges 1, 2, between which a cut-off clip is included The wire groove 5, the shape of the wire clamping groove is roughly an inverted Y. Here, the top edges 7 and 8 of the Y-shape facing each other in an inverted V shape form a cutting area penetrating through the insulating layer of the wire, and an insertion opening 6 is defined between the two top edges. On the other hand, the substantially parallel leg edges 9 , 10 of the Y-shape form the connection contact area. The insertion opening 6 or the Y-shaped top edge 7 , 8 forms a corrugation in its longitudinal direction like the cutting edge of a household knife.

The facing end faces 11 , 12 of the top edges 7 , 8 are inclined in such a way that their inner sides facing the conductor end receiving space 13 form an acute-angled cutting edge 14 , 15 . The cutting edges 14 , 15 thus form a positive relief angle with the adjoining end faces 11 and 12 , the outer sides 16 and 17 of which are set back from the insertion opening 6 . In the region of the cutting edges 14 , 15 the contact legs 3 and 4 lie approximately in the same plane. In the region of the leg edges forming the clamping contact, the contact end sides 18 and 19 of the contact legs 3 and 4 face the receiving space 13 of the conductor end. Together with their outer surfaces 20 and 21 they form an outwardly open corner 22 .

The plane bounded by the contact legs 3 and 4 in the region of the cutting edges 14 and 15 and containing the insertion opening 6 slopes outwards towards the side facing away from the conductor end receiving space 13 and forms an obtuse angle 23 with the clamping contact area 24 .

Between the insertion opening 6 and the clamping contact area 24 there is a gap-shaped transition region 25 lying in the plane of the insertion opening 6 . In the transition zone 25, the mutually opposite end sides 11 and 12 or 18 and 19 of the contact legs 3 and 4 are rolled up around an axis extending approximately along its longitudinal direction, so that the transition edge forming the transition gap forms a The knife-edge-like transitions from the inner cutting edges 14 and 15 of the upper receiving space 13 to the outer edges 26 and 27 of the clamping contact area 24 facing away from the conductor end receiving space 13 . This transition is seamless. On its side facing away from the contact legs 3 and 4, the conductor end receiving space 13 has a contact stop for an uninsulated conductor end. In the present embodiment, the contact stop is formed by at least one of the two clamping contact jaws 28 and 29 which contain a clamping contact groove between them.

These cut-off terminals consist of a single bimetallic segment. It is formed by a U-shaped base body surrounding the lead-end receiving space 13, the U-shaped legs 30, 31 of which form the side walls of the base body. Contact legs 3 and 4 are formed on one side edge (the front side edge in the case shown in FIGS. 1 to 3 ) on each of the two side walls. The other (rear in the figure) side edge each supports a clamping contact jaw 28 or 29 . The U-bridge-shaped bottom bridge 32 together with the U-legs 30 , 31 forms the U-shape of the basic body. The U-shape of the basic body also forms a frame around the lead-end receiving space by a closed portion 33 of the free ends of the U-legs 30, 31 opposite the U-shaped bridge 32. The closure portion 33 consists of a deflectable notch 34 and a deflectable disc 35 which is hingedly engaged in the deflectable notch 34 so that the U-shaped legs 30 and 31 can make some kind of relative movement. This mobility is further supported by the elastic design of the U-shaped bridge 32 between the two U-shaped legs 30 and 31 .

To remove the insulation, an uninsulated conductor is moved perpendicular to its longitudinally cross-cut end in the direction of the arrow at the insertion hole 6 . In this case, the wire stub projects into the receiving space 13 and abuts against a contact stop, for example at least one of the two clamping contact jaws 28 and 29 . When the end of the wire is inserted into the insertion opening 6 ( FIG. 2 ), the end of the wire is subjected to a force substantially parallel to the longitudinal direction of the U-shaped leg, pushed toward the cutting-type wiring gap 5 and thus moved to the inside thereof. Due to the inclination of the top edges 7, 8 forming the insertion opening 6 or of the cutting edges 14 and 15 formed by the top edges 7 and 8, not only is the insulation of the wire cut but the wire is further pressed against the clamping jaws 28 and 29 directions. Further exerting pressure, the contact legs 3 and 4 will elastically diverge from each other, and thus the wire with the deinsulated layer can be inserted into the clamping gap 5 of the clamping contact area 24, where, due to the elastic clamping force, and partially Due to the small cutouts on the contact legs 3, 4, the conductors are held securely. Owing to the elastic divergence of the contact legs 3 and 4 when the stripped wire is inserted into the clamping gap 5, also due to the inclination of the transition region 25 between the clamping gap 5 and the insertion hole 6 and the previously described curved shape , forming a pushing force towards the clamping contact jaws 28 and 29, which forms a pressing force on the end of the wire without insulation after being cut off, so that the wire end abuts against the clamping contact jaws, for example One of 28 and 29 rests on or against the other contact, thereby forming an additional contact point.

Claims (16)

1. one kind is used to contact one and does not remove the insulation piercing connecting device of the electric lead end of insulating barrier, it has two contact legs (3,4), the incline (1 of these two contact legs, 2) toward each other, comprise a cutting type wiring gap (5) that is roughly Y shape between these two the contact legs, V-shapedly form the top rib (7 of a patchhole (6) toward each other and betwixt at described Y shape gap location, 8) constitute a cutting area that is used to penetrate wire insulation, and Y shape gap location pin rib (9 parallel to each other basically, 10) constitute one and clamp contact zone (24), it is characterized in that: constitute a U-shaped matrix that receives the space round wire termination, its U-shaped leg (30,31) be connected to each other by a U-shaped bridge (32), wherein, U-shaped leg (30,31) sidewall of formation matrix, an incline on it forms described contact leg (3,4), this contact leg is by the mode effect of an elasticity clamp.

2. insulation piercing connecting device as claimed in claim 1 is characterized in that: on U-shaped leg (30, the 31) incline relative with the contact leg, also form a contact jaw (28,29) betwixt, this jaw constitutes one and clamps the contact groove.

3. insulation piercing connecting device as claimed in claim 1 or 2 is characterized in that: the U-shaped of matrix further constitutes a framework that receives space (13) round wire termination by a free-ended enclosure portion relative with U-shaped bridge (32) of U-shaped leg (30,31).

4. insulation piercing connecting device as claimed in claim 3 is characterized in that: described enclosure portion has hinged form, so that make U-shaped leg (30,31) have mobility each other.

5. insulation piercing connecting device as claimed in claim 1 or 2 is characterized in that: described U-shaped bridge (32) is an elastic construction.

6. insulation piercing connecting device as claimed in claim 1 or 2 is characterized in that: it is made of a tabular elastic contact material.

7. insulation piercing connecting device as claimed in claim 1 or 2 is characterized in that: Y shape top rib (7,8) longitudinally forms ripple according to the blade shape of family expenses cutter.

8. insulation piercing connecting device as claimed in claim 1 or 2, it is characterized in that: the end face respect to one another (11,12) of top rib (7,8) tilts as follows, promptly, they constitute an acute angle cutting edge (14,15) in the inboard that receives space (13) towards wire termination, described end face (11,12) is adjacent with a positive relief angle and this cutting edge (14,15), and its outside (16,17) is thus from inserting opening (6) toward rollback.

9. insulation piercing connecting device as claimed in claim 1 or 2 is characterized in that: described contact leg (3,4) in the zone of cutting edge (14,15) roughly in a common plane.

10. insulation piercing connecting device as claimed in claim 1 or 2, it is characterized in that: the pin rib (9,10) of contact leg (3,4) in clamping the contact zone located, contact end face (18,19) towards the reception space (13) of wire termination with it, and constitute an outwardly open angle (22) with its outer surface (20,21).

11. insulation piercing connecting device as claimed in claim 8, it is characterized in that: the plane of the insertion mouth (6) that is limited by the contact leg (3,4) in cutting edge (14,15) zone, with respect to clamp contact groove (24) with an obtuse angle (23) to deviating from a side that wire termination receives space (13) towards outer incline.

12. insulation piercing connecting device as claimed in claim 8 is characterized in that: between cutting edge district (14,15) and clamping contact zone (24) is the transition region (25) of a gap-like, and it is in the plane of inserting mouthful (6) basically.

13. insulation piercing connecting device as claimed in claim 12 is characterized in that: contact leg (3,4) end face (11,12 towards each other; 18,19) in transition region (25) around one roughly along the axis of its longitudinal extension from inserting mouthful (6) to clamping the bending of contact groove (5), its transition prismatic that constitutes transition gap becomes a knife edge shape changeover portion from the inner cutter hole (14,15) that receives space (13) towards wire termination to the outer rib (26,27) in the reception space of wire termination dorsad (13) that clamps contact zone (24).

14. insulation piercing connecting device as claimed in claim 13 is characterized in that: described changeover portion is seamless.

15. insulation piercing connecting device as claimed in claim 3 is characterized in that: the reception space (13) of wire termination has a contactor banking stop that is used for uninsulated wire termination contacting leg (3, a 4) side dorsad.

16. insulation piercing connecting device as claimed in claim 1 or 2 is characterized in that: its bimetal piece by a monomer constitutes.

Images