LU502936B1 - Screw connection arrangement and connection terminal - Google Patents

Abstract

The subject of the invention is a screw connection arrangement (100) for connecting an electrical conductor, with a clamping screw (110), a clamping sleeve body (111) having a receiving space (130), and a current bar (112) which is introduced into the receiving space (130) and against which the conductor to be connected can be clamped by means of the clamping screw (110), wherein a protective plate (113) is arranged between the clamping screw (110) and the current bar (112), wherein the protective plate (113) is fastened to the current bar (112) and a first fastening arm (121A) is arranged on a first longitudinal edge surface (122A) of the protective plate (113) and a second fastening arm (121B) for holding the protective plate is arranged on a second longitudinal edge surface (122B) of the protective plate (113) arranged opposite the first longitudinal edge surface (122A) of the protective plate (113). (113) are arranged on the current bar (112).

Description

Screw connection arrangement and connection terminal

The invention relates to a screw connection arrangement for connecting an electrical conductor, which comprises a clamping screw, a receiving space

Clamping sleeve body, and a current bar which is introduced into the receiving space and against which the conductor to be connected can be clamped by means of the clamping screw (110). The invention further relates to a connection terminal with at least one such screw connection arrangement.

Such screw connection arrangements are used, for example, in electrical connection terminals such as series terminals, circuit board connection terminals or lamp terminals. Electrical connection terminals with screw connections are characterized by their high clamping forces that can be transferred to electrical conductors at a constant rate over many years. With this type of terminal, specified high clamping forces can be maintained without fluctuations, even when the electrical connection terminal is subject to vibrations. Due to these properties, electrical connection terminals with

Screw connections are also preferred for demanding industrial applications with moving and vibrating machine parts.

Typically, such a screw connection arrangement has a current bar which is inserted into the receiving space of the clamping sleeve body and against which the conductor to be connected is clamped in the connected state. The

Current bar is usually made of a copper material, which has good electrical conductivity, in particular good current conductivity. However, the copper material has low mechanical strength, so that it can be

can easily be deformed or even penetrated by force, such as the force exerted by the clamping screw.

The invention is therefore based on the object of providing a screw connection arrangement for

which is characterized by improved functionality, in particular improved stability.

The object is achieved according to the invention with the features of the independent claims. Expedient embodiments and advantageous further developments of the invention are specified in the subclaims.

The screw connection arrangement according to the invention is characterized in that a protective plate is arranged between the clamping screw and the current bar, wherein the protective plate is fastened to the current bar and a first fastening arm is arranged on a first longitudinal edge surface of the protective plate and a second fastening arm for holding the protective plate on the current bar is arranged on a second longitudinal edge surface of the protective plate arranged opposite the first longitudinal edge surface of the protective plate.

According to the invention, it is now provided that the screw connection arrangement additionally has a protective plate which can absorb the forces acting on the current bar from the clamping screw when connecting a conductor, and via its

surface, so that the forces acting on the current bar itself can be reduced, particularly per surface. In particular, a point load acting on the current bar through the clamping screw can be avoided. Deformation or even piercing of the current bar by the force acting on the current bar

clamping screw can be prevented. The stability of the entire screw connection arrangement can be improved. Because the protective plate is arranged between the clamping screw and the current bar, a direct

Contact between the current bar and the clamping screw must be avoided. The

The protective plate is preferably designed in such a way that it lies flat against the current bar, in particular in the area where the clamping screw acts on the current bar. The current bar and the protective plate can be positioned or laid on top of each other. This means that the arrangement of the current bar with the protective plate can have a sandwich shape. The protective plate is preferably inserted into the receiving space of the clamping sleeve body in the same way as the current bar. In order to be able to achieve a slip-proof positioning of the protective plate on the current bar, the protective plate has two fastening arms arranged opposite one another, by means of which the protective plate is held and thus fastened to the current bar. The protective plate can thus

Encompass the current bar at least in part, in particular across the width of the

The fastening arms are preferably designed in such a way that they protrude from one of the longitudinal edge surfaces of the protective plate and are bent into the corresponding shape. The two fastening arms each form a type of gripping arm.

Preferably, it is provided that the first fastening arm encompasses a first longitudinal edge surface of the current bar and/or that the second fastening arm encompasses a second longitudinal edge surface of the current bar arranged opposite the first longitudinal edge surface.

current bar. The protective plate can thus at least partially encompass the current bar, in particular at least partially encompass the width of the current bar. The fastening arms are preferably designed in such a way that they protrude from one of the longitudinal edge surfaces of the protective plate and are bent into the corresponding shape. The two fastening arms can thus each form a type of gripping arm.

In order to prevent axial slipping of the protective plate along the length of the current bar, a first

A stop edge for the first fastening arm and/or a second stop edge for the second fastening arm can be formed on the second longitudinal edge surface of the current bar. The stop edge on the first longitudinal edge surface and/or the stop edge on the second longitudinal edge surface can each protrude from the respective longitudinal edge surface. To form the stop edges, web-shaped projections can be formed on the respective longitudinal edge surface of the current bar.

To ensure that the protective plate is securely held on the current bar by means of the fastening arms, the first fastening arm can be bent in a C-shape and/or the second fastening arm can be bent in a C-shape.

The first fastening arm can have a free end and the second fastening arm can have a free end. The two free ends of the fastening arms can be opposite each other. The two fastening arms can be designed to be so long that the free ends of the fastening arms are arranged adjacent to each other. A gap can be formed between the free end of the first fastening arm and the free end of the second fastening arm. It is also possible for the fastening arms to be designed to be so long that the free end of the first fastening arm can abut against the free end of the second fastening arm. With such a design of the fastening arms, the protective plate can encompass the current bar over its entire outer circumferential surface. In the area of the

The protective plate can thus enclose the current bar in a ring-shaped manner using fastening arms.

To hold the protective plate to the current bar, the protective plate can further have a fastening tab extending in the longitudinal direction of the protective plate, which can encompass an end section of the current bar. The fastening tab can extend at a 90° angle to the two fastening arms. The fastening tab can be designed in such a way that it extends along its length in the direction of the

end section of the current bar. The fastening strap can clamp around the end section of the current bar. The fastening strap can prevent axial

Prevent the protective plate from slipping along the length of the current bar.

Preferably, the current bar is made of a first material and the protective plate is made of a second material that differs from the first material. The current bar and protective plate are thus preferably made of different materials, so that the protective plate has different material properties than the current bar.

Particularly preferably, the second material has a higher mechanical strength than the first material. As a result, the protective plate, which has greater strength and thus stability than the current bar, can protect the current bar particularly well against

Protect the current bar from deformation and/or penetration by using the clamping screw.

The first material of the current bar can preferably be made of a copper material. The copper material has particularly good electrical conductivity.

The second material of the protective plate can preferably be made of a steel material. The steel material is characterized by a high hardness or mechanical

strength, but is poorly electrically conductive.

The solution to the problem according to the invention is further achieved by means of a connection terminal which has a housing and at least one screw connection arrangement arranged in the housing, which is designed and developed as described above. Such a connection terminal can be, for example, a circuit board connection terminal, but also a series terminal.

The invention is explained in more detail below with reference to the accompanying drawings using preferred embodiments.

Showing 5

Fig. 1 is a schematic representation of a screw connection arrangement according to the invention,

Fig. 2 is a schematic sectional view of the screw connection arrangement shown in Fig. 1,

Fig. 3 is a schematic representation of the protective plate shown in Fig. 1,

Fig. 4 is a further schematic representation of the protective plate shown in Fig. 3,

Fig. 5 is a schematic representation of the current bar shown in Fig. 1 with the protective plate arranged thereon,

Fig. 6 is a schematic representation of a further embodiment of a protective plate,

Fig. 7 is a further schematic representation of the protective plate shown in Fig. 6,

Fig. 8 is a schematic representation of the protective plate shown in Fig. 6 arranged on a current bar,

Fig. 9 is a schematic representation of a connection arrangement with the protective plate shown in Fig. 6,

Fig. 10 is a further schematic representation of the connection arrangement shown in Fig. 9, and

Fig. 11 is a schematic representation of a further embodiment of a protective plate.

Fig. 1 and 2 show a screw connection arrangement 100 for connecting an electrical conductor not shown here.

The screw connection arrangement 100 has a clamping screw 110, a clamping sleeve body 111, a current bar 112 and a

Protective plate 113.

The clamping sleeve body 111 has a receiving space 130 into which the conductor to be connected can be inserted and in which the conductor to be connected can be connected by clamping the current bar 112 by means of the clamping screw 110 against the conductor inserted into the receiving space 130.

The clamping sleeve body 111 is made of a milled metal material. The

The clamping sleeve body 111 can also be made of a folded metal material. The clamping sleeve body 111 has two side walls 114, 115 arranged opposite one another, a base wall 116 and a top wall 117. The receiving space 130 is enclosed by the two side walls 114, 115, the base wall 116 and the top wall 117. A threaded hole 118 is made in the top wall 117, in which the clamping screw 110 is guided and held.

The protective plate 113 is arranged between the clamping screw 110 and the current bar 112, so that the clamping screw 110 does not act directly on the current bar 112, but acts on the current bar 112 via the protective plate 113. The

Protective plate 113 is a separate component from the current bar 112, which is attached to the

current bar 112 can be mounted. The protective plate 113 can thus be retrofitted. The

Protective plate 113 is inserted into the receiving space 130 together with the current bar 112.

The current bar 112 is made of a first material. The first material here is a copper material. The protective plate 113 is made of a second material. The second material here is a steel material. Due to this different choice of material, the current bar 112, which is made of a copper material, has particularly good electrical conductivity and thus particularly good current conductivity. The protective plate 113, which is made of a steel material, on the other hand, does not have good electrical conductivity, but the protective plate 113 has high mechanical strength and thus high mechanical stability in order to be able to absorb the pressure load of the clamping screw 110.

In Fig. 3 and 4, the protective plate 113 shown in Fig. 1 and 2 is shown alone. The

The protective plate 113 has a base body 119 extending parallel to the current bar 112. The protective plate 113 rests flat on the base body 119 on an upper side 120 of the current bar 112, as can be seen in Fig. 2 and 5. The upper side 120 of the current bar 112 is directed in the direction of the clamping screw 110. With a

The underside 128 of the current bar 112 can rest on the connected conductor in the clamped state of the current bar 112.

Two fastening arms 121A, 121B are formed on the base body 119. A first

Fastening arm 121A is arranged on a first longitudinal edge surface 122A of the protective plate 113 or the base body 119 and a second fastening arm 121B is arranged on a second longitudinal edge surface 122A opposite the first longitudinal edge surface 122A.

Longitudinal edge surface 122B of the protective plate 113 or the base body 119.

The two fastening arms 121A, 121B are each bent out of the plane of the base body 119 in such a way that the first fastening arm 121A encompasses a first longitudinal edge surface 123A of the current bar 112 and that the second fastening arm 121B encompasses a second longitudinal edge surface 123B of the current bar 112. The two

Mounting arms 121A, 121B extend from the top 120 of the

current bar 112 to the bottom 128 of the current bar 112.

In order to prevent axial slipping of the protective plate 113 along the length of the current bar 112, a first stop edge 124A for the first fastening arm 121A is formed on the first longitudinal edge surface 123A of the current bar 112 and a second stop edge 124B for the second fastening arm 121B is formed on the second longitudinal edge surface 123B of the current bar 112. The stop edge 124A on the first longitudinal edge surface 123A and the stop edge 124B on the second longitudinal edge surface 123B each protrude from the respective longitudinal edge surface 123A, 123B of the

current bar 112. To form the stop edges 124A, 124B, web-shaped projections 125A, 125B are formed on the respective longitudinal edge surface 123A, 123B of the current bar 112. Due to the two projections 125A, 125B, the

Current bar 112 has an increased width at this point. The two fastening arms 121A, 121B rest on the stop edge 124A, 124B assigned to them.

In addition to the two fastening arms 121A, 121B, the protective plate 113 shown here has a fastening tab 126 extending in the longitudinal direction of the protective plate 113, which encompasses an end section 127 of the current bar 112. The fastening tab 126 extends at a 90° angle to the two fastening arms 121A, 121B away from the base body 119 of the protective plate 113. Starting from the base body 119, the fastening tab 126 tapers along its

Length. The fastening tab 126 encloses the end section 127 of the current bar 112. The fastening tab 126 together with the two stop edges 124A, 124B of the current bar 112 or with the two fastening arms 121A, 121B of the protective plate 113 resting on the stop edges 124A, 124B allows an axial

Slipping of the protective plate 113 along the length of the current bar 112 can be prevented, as can be seen in Fig. 5.

In Fig. 6 and 7 another possible embodiment of a protective plate 113 is shown.

In contrast to the protective plate 113 shown in Fig. 1 to 5, this does not have a fastening tab 126. The two fastening arms 121A, 121B are also shorter here on the two longitudinal edge surfaces 122A, 122B of the protective plate 113 or the base body 119.

As can be seen in Fig. 7, the two fastening arms 121A, 121B are each bent in a C-shape in order to encompass the longitudinal edge surfaces 123A, 123B of the current bar 112.

As can be seen in Fig. 8, the current bar 112 also has stop edges 124A, 124B for the fastening arms 121A, 121B in order to prevent axial slipping of the

Protective plate 113 along the length of the current bar 112. To form the stop edges 124A, 124B, web-shaped projections 125A, 125B are formed on the respective longitudinal edge surface 123A, 123B of the current bar 112. Due to the two projections 125A, 125B, the current bar 112 has an increased width at this point.

Fig. 9 and 10 show a connection arrangement 100 with a protective plate 113 and a

Current bars 112 as shown in Fig. 6 to 8. Otherwise, the connection arrangement 100 shown in Fig. 9 and 10 corresponds to the connection arrangement shown in Fig. 1 and 2.

Fig. 11 shows another possible design of a protective plate 113, which is similar to the design shown in Fig. 6 and 7. In the design shown in Fig. 11, however, the fastening arms 121A, 121B of the protective plate 113 are each designed to be so long that the free end 129A of the first fastening arm 121A abuts against the free end 129B of the second fastening arm 121B. In this design, the protective plate 113 surrounds the current bar 112 over its entire outer circumferential surface. In the area of the fastening arms 121A, 121B, the protective plate 113 can thus enclose the current bar 112 in a ring shape.

List of reference symbols 100 Screw connection arrangement 110 Clamping screw 111 Clamping sleeve body

112 Current bar 113 Protection plate 114 First side wall 115 Second side wall

116 Bottom wall 117 Ceiling wall 118 Threaded hole 119 Base body 120 Top

121A, 121B Mounting arm 122A, 122B Longitudinal edge surface 123A, 123B Longitudinal edge surface 124A, 124B Stop edge 125A, 125B Projection

126 Fastening tab 127 End section 128 Bottom 129A, 129B Free end 130 Receptacle

Claims (10)

Expectations 1. Screw connection arrangement (100) for connecting an electrical conductor, with a clamping screw (110), a clamping sleeve body (111) having a receiving space (130), and a current bar (112) which is introduced into the receiving space (130) and against which the conductor to be connected can be clamped by means of the clamping screw (110), characterized in that a protective plate (113) is arranged between the clamping screw (110) and the current bar (112), wherein the protective plate (113) is fastened to the current bar (112) and a first fastening arm (121A) is arranged on a first longitudinal edge surface (122A) of the protective plate (113) and a second fastening arm (121B) for holding the protective plate is arranged on a second longitudinal edge surface (122B) of the protective plate (113) arranged opposite the first longitudinal edge surface (122A) of the protective plate (113). (113) are arranged on the current bar (112). 2. Screw connection arrangement (100) according to claim 1, characterized in that the first fastening arm (121A) engages around a first longitudinal edge surface (123A) of the current bar (112) and/or that the second fastening arm (121B) engages around a second longitudinal edge surface (123B) of the current bar (112) arranged opposite the first longitudinal edge surface (123A). 3. Screw connection arrangement (100) according to claim 2, characterized in that a first stop edge (124A) for the first fastening arm (121A) is formed on the first longitudinal edge surface (123A) of the current bar (112) and/or a second stop edge (124B) for the second fastening arm (121B) is formed on the second longitudinal edge surface (123B) of the current bar (112). 4. Screw connection arrangement (100) according to one of claims 1 to 3, characterized in that the first fastening arm (121A) is bent in a C-shape and/or that the second fastening arm (121B) is bent in a C-shape. 5. Screw connection arrangement (100) according to one of claims 1 to 4, characterized in that the first fastening arm (121A) has a free end (129A) and that the second fastening arm (121B) has a free end (129B), wherein the free end (129A) of the first fastening arm (121A) abuts against the free end (129B) of the second fastening arm (121B). 6. Screw connection arrangement (100) according to one of claims 1 to 5, characterized in that the protective plate (113) has a fastening tab (126) extending in the longitudinal direction of the protective plate (113) and engaging around an end section (127) of the current bar (112). 7. Screw connection arrangement (100) according to one of claims 1 to 6, characterized in that the current bar (112) is made of a first material and the protective plate (113) is made of a second material different from the first material. 8. Screw connection arrangement (100) according to claim 7, characterized in that the second material has a higher mechanical strength than the first material. 9. Screw connection arrangement (100) according to claim 7 or 8, characterized in that the second material is made of a steel material. 10. Connection terminal, with a housing and at least one screw connection arrangement (100) arranged in the housing, which is designed according to one of claims 1 to 9.