LU502954B1 - Screw connection arrangement and connection terminal - Google Patents

Abstract

The invention relates to a screw connection arrangement (100) for connecting an electrical conductor (L), with a clamping screw (110), a current bar (112) against which the conductor (L) to be connected can be clamped by means of the clamping screw (110), and a clamping body (111) which has a clamping cage (113) forming a conductor connection space (119) and a cross nut (114), wherein the clamping cage (113) and the cross nut (114) each have a threaded bore (125) in which the clamping screw (110) is guided, and wherein the clamping cage (113) is formed from a flat strip material (120) which is bent in such a way that it forms a tubular body having two side walls (115, 116) arranged opposite one another, a bottom wall (117) and a top wall (118) arranged opposite the bottom wall (117), wherein a first end section (121) of the flat strip material (120) has at least one puzzle-like contour (123, 123A, 123B) and a second end section (122) of the flat strip material (120) arranged opposite the first end section (121) has at least one puzzle-like counter-contour (124, 124A, 124B) which engages in the at least one puzzle-like contour (123, 123A, 123B) to connect the two end sections (121, 122) to one another.

Description

Screw connection arrangement and connection terminal

The invention relates to a screw connection arrangement for connecting an electrical conductor. 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.

Clamping cages of a clamping body of a screw connection arrangement known on the market can be produced, for example, by a punching and bending process. These are then partly designed in such a way that two tabs in the area of the passage of the

Clamping screw lie on top of each other. A threaded through hole is made through both lugs to accommodate the clamping screw. The advantage here is that the two lugs can move against each other, which causes the clamping screw to jam, a so-called screw brake. This prevents the screwed-in clamping screw from coming out of the

The disadvantage here is that only two

Tabs lie on top of each other, as is known for example from DE 1 996 971 U. The number of load-bearing threads is thus relatively low, because for reasons of space and

For cost reasons, the material thickness of the flat band is chosen to be as thin as possible. The risk that the threads in the tabs will be damaged by the applied screw or

The risk of the clamping force being destroyed is therefore very high. For these reasons, other clamping cages of a clamping body available on the market have a threaded passage in one of the tabs. On the one hand, this increases the number of load-bearing threads, and on the other hand, the clamping effect of the clamping screw may no longer be present if only one tab is designed with a thread, as is known, for example, from DE 10 2011 051 231 A1. This makes an additional contour necessary, e.g. in the insulating housing of a connection terminal, so that the clamping screw does not rotate in or out of the clamping body by itself. In addition, the production of a threaded passage is an additional manufacturing effort, which causes higher costs and requires specialist knowledge.

The invention is therefore based on the object of providing a screw connection arrangement and a connection terminal which are characterized by high functionality and at the same time reduced manufacturing costs.

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 comprises a clamping screw, a

Current bar, against which the conductor to be connected can be clamped by means of the clamping screw, and a clamping body, which has a clamping cage forming a conductor connection space and a cross nut, wherein the clamping cage has a bore and the cross nut has a threaded bore into which the clamping screw is guided. The clamping cage is made of a flat strip material which is bent in such a way that the flat strip material forms a tubular body having two side walls arranged opposite one another, a bottom wall and a top wall arranged opposite the bottom wall, wherein a first end section of the flat strip material has at least one puzzle-like contour and a second end section of the

Flat strip material has at least one puzzle-like counter contour, which

Connecting the two end sections together in at least one puzzle-like

contour engages.

According to the invention, the clamping body is formed from a clamping cage and a cross nut. The clamping cage is formed from a flat strip material, so that the

Clamping cage can be made from a stamped and bent part. The flat strip material can be characterized by a particularly low material thickness, which also

The clamping cage and thus the entire screw connection arrangement can have the smallest possible component dimensions. The flat strip material is now bent in such a way that no overlapping areas are formed on the clamping cage.

Instead, it is provided according to the invention that the flat strip material for forming the clamping cage is connected to one another at its two end sections, so that the flat strip material in the connected state of the two end sections has a

Tubular body, in particular a rectangular tubular body. This tubular body or the flat strip material preferably has the same thickness over its entire length or over its entire circumference, so that overlapping areas are avoided. The flat strip is designed so thin that the clamping body can be made as narrow as possible and at the same time the required clamping forces can be absorbed by the clamping body. To connect the two

According to the invention, at least one puzzle-like contour is formed on the first end section and at least one puzzle-like counter-contour is formed on the second end section, which interlock in order to connect the two end sections to one another. The puzzle-like contour can be formed by a T-shaped projection or a T-shaped recess in the first end section and the puzzle-like counter-contour can be formed by a T-shaped recess or a T-shaped projection in the second end section.

The tubular body can be closed by the two end sections engaging with each other via their puzzle-like contour or puzzle-like counter-contour, so that a closed force system can be formed. The interlocking of the puzzle-like contour with the puzzle-like counter-contour enables a positive connection of the two end sections of the flat strip material. The manufacturing effort of a clamping body designed in this way is significantly reduced compared to known clamping bodies in which the tabs or end sections are folded onto each other. The

The hole in the clamping cage for receiving the clamping screw can be designed with or without a thread.

Preferably, the at least one puzzle-like contour and the at least one puzzle-like counter-contour each have at least one wedge-shaped surface. The wedge-shaped surfaces can be used to form undercuts, whereby the puzzle-like contour can interlock with the puzzle-like counter-contour even more securely and an unintentional separation of the two end sections from each other can be particularly reliably avoided. The wedge-shaped surfaces allow the puzzle-like contour of the first end section to pull towards the puzzle-like counter-contour of the second end section when subjected to tensile load. This can increase the tensile load capacity of the clamping cage.

Particularly preferably, it can be provided that two puzzle-like contours are formed on the first end section and two puzzle-like counter-contours are formed on the second end section. This can achieve a T-shaped puzzle-like

The contour of the first end section is enclosed by two T-shaped puzzle-like counter-contours of the second end section in such a way that lateral deflection is not possible under tensile load. This enables a particularly safe and stable connection of the two end sections to one another, even when there is a high tensile load on the two end sections.

The two end sections are preferably positioned on the clamping body in such a way that the two end sections form one of the two side walls. This allows the ceiling wall in particular, where the threaded hole for receiving the clamping screw is formed, to have a continuous surface with a constant thickness over its entire

have a wall thickness of length and width.

In addition to the positive connection by means of the interlocking puzzle-like contour with the puzzle-like counter-contour, the two end sections can be connected to each other by means of a welded connection. The welded connection can prevent the end sections from twisting against each other, which increases the stability of the connection between the two end sections and thus of the entire

clamping cage can be increased. The welded connection can be formed by one or more spot welds between the two end sections. The

Welded joint can be a laser beam welded joint.

The cross nut is preferably held on the clamping cage. To hold the

Cross nut on the clamping cage, a recess can be formed on each of the two side walls of the clamping cage, into which the cross nut engages and is held. The recess on the first side wall is preferably formed opposite the recess on the second side wall. The cross nut can be hung in the two recesses formed opposite each other on the side walls. The recesses can be punched or punched out on the two side walls of the clamping cage.

The cross nut can have two opposing holding arms, which can engage in the recesses on the two side walls. The two

Holding arms are preferably designed symmetrically to each other on the cross nut.

The two holding arms can each be designed in the form of a web. 5

In order to limit the possible relative movement between the cross nut and the clamping cage, the cross nut can have two oppositely arranged

Have anti-twisting bars. The anti-twisting bars preferably extend at a 90° angle to the two holding arms. The anti-twisting bars can be flush with a front side surface and a rear side surface of the clamping cage, as seen in the direction of insertion of the conductor to be connected.

The cross nut can be made from a flat strip material just like the clamping cage. The cross nut can then be manufactured by a punching process. The thickness of the flat strip material of the cross nut is preferably designed so that the largest possible threaded hole can be made in order to ensure the necessary load-bearing capacity to absorb the clamping torque of the clamping screw.

The clamping cage and the cross nut can be made of the same material.

It is also possible for the clamping cage and the cross nut to be made of different materials. For example, the flat strip material of the

The clamping cage can be a copper material or a steel material. The flat band material of the cross nut can also be a copper material or a steel material.

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.

Show it

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

Fig. 2 is a schematic exploded view of the clamping body shown in Fig. 1,

Fig. 3 is a schematic representation of a development of the clamping cage shown in Fig. 1 and 2,

Fig. 4 is a schematic representation of a clamping body according to another

Embodiment of the invention, and

Fig. 5 is a schematic representation of a development of the device shown in Fig. 4

clamping cage.

Fig. 1 shows a screw connection arrangement 100 for connecting an electrical

Director L.

The screw connection arrangement 100 has a clamping screw 110, a clamping body 111 and a current bar 112. The current bar 112 is inserted into the clamping body 111 so that the conductor L to be connected can be clamped against the current bar 112 within the clamping body 111 by means of the clamping screw 110 and can thus be connected.

Fig. 2 shows the clamping body 111 in an exploded view. The clamping body 111 has a clamping cage 113 and a cross nut 114.

The clamping cage 113 has two side walls 115, 116 arranged opposite one another, a bottom wall 117 and a top wall 118. The two side walls 115, 116, together with the bottom wall 117 and the top wall 118, enclose a conductor connection space 119 formed by the clamping cage 113. The conductor L to be connected is introduced into this conductor connection space 119 in the insertion direction E in order to be clamped and connected within the conductor connection space 119 by means of the clamping screw 110 against the current bar 111. The two side walls 115,

116 together with the bottom wall 117 and the ceiling wall 118 form a rectangular tubular body.

The clamping cage 113 is formed from a flat strip material 120 as shown in Fig. 3 and bent into the corresponding shape as shown in Fig. 2. The

Flat strip material 120 has a strip shape. The flat strip material 120 has a first end section 121 and a second end section 122 arranged opposite the first end section 121. In order to connect the two end sections 121, 121 to form the clamping cage 113, the first end section 121 of the flat strip material 120 has a puzzle-like contour 123 and the second end section 122 of the flat strip material 120 has a puzzle-like counter-contour 124. As can be seen in Fig. 1 and 2, the puzzle-like contour 123 engages in the puzzle-like counter-contour 124 in a form-fitting manner. The puzzle-like contour 123 is formed by a T-shaped

projection on the first end portion 121 of the flat strip material 120. The puzzle-like counter contour 124 is formed by a T-shaped recess on the second

End section 122 of the flat strip material 120 is formed. This puzzle-like interlocking of the two end sections 121, 122 prevents the end sections 121, 122 of the flat strip material 120 from overlapping when the clamping cage 113 is bent into shape. If the flat strip material 120 is bent into the shape of the clamping cage 113, the two end sections 121, 122 form the second side wall 116 of the

clamping cage 113, as can be seen in Fig. 1 and 2.

The two end sections 121, 122 are additionally connected to each other via a welded joint 129, as indicated by the circles in Fig. 1. The

Welded joint 129 is designed in the form of two spot welds.

The spot weld connection can be formed by laser beam welding.

Furthermore, a hole 125 is made in the flat strip material 120 to accommodate the clamping screw 110. The hole 125 is designed here without a thread. The hole 125 can also be designed with a thread.

As can be seen in Fig. 3, to the right and left of the bore 125 there is a

Recesses 126, 127 are made in the flat strip material 120. These recesses 126, 127 are designed as through-openings. These recesses 126, 127 serve to hold the cross nut 114 on the clamping cage 113. As shown in Fig.

1 and 2, the recesses 126, 127 extend along the first

side wall 115 and the second side wall 116 of the clamping cage 113, so that the

Cross nut 114 can be held and fastened to the two side walls 115, 116 of the clamping cage 113.

The cross nut 114 is positioned in the conductor connection space 119 between the current bar 112 and the ceiling wall 118 of the clamping cage 113.

The cross nut 114 has a threaded bore 128 which is aligned with the bore 125 of the clamping cage 113.

The cross nut 114 has the shape of a cross, as can be seen in Fig. 2.

The cross nut 114 has two oppositely arranged holding arms 130, 131, by means of which the cross nut 114 is held on the clamping cage 113. The first holding arm 130 engages in the first recess 126 of the clamping cage 113 and the second

Holding arm 131 engages in the second recess 127 of the clamping cage 113. The two

Holding arms 130, 131 are arranged and designed symmetrically to one another. The two holding arms 130, 131 each have a web shape.

In addition to the two holding arms 130, 131, the cross nut 114 has two anti-twisting bars 132, 133 arranged opposite one another. The two anti-twisting bars 132, 133 extend at a 90° angle to the two holding arms 130, 131. The two anti-twisting bars 132, 133 are flush with a front side surface 134 and a rear side surface 135 of the clamping cage 113, as can be seen in Fig. 1.

The cross nut 114, like the clamping cage, can be made from a correspondingly punched flat strip material.

Fig. 4 and 5 show an embodiment of a screw connection arrangement 100, which essentially corresponds to the embodiment shown in Fig. 1 to 3. The only difference is the design of the two end sections 121, 122 of the flat strip material 120.

Two puzzle-like contours 123A, 123B in the form of two T-shaped recesses are formed on the first end section 121. Two puzzle-like counter-contours 124A, 124b in the form of two T-shaped projections are formed on the second end section 122. A T-shaped projection 136 is formed between the two recesses by the two T-shaped recesses on the first end section 121. A T-shaped recess 137 is formed between the two projections by the two T-shaped projections on the second end section 122. This makes it possible for the T-shaped projection 136 of the first end section 121 to be separated from the two

T-shaped puzzle-like counter contours 124A, 124B of the second end section 122 are enclosed in such a way that a lateral deflection of the end sections 121, 122 is not possible under tensile load.

In the embodiment shown in Fig. 4 and 5, the puzzle-like contours 123A, 123B and the puzzle-like counter-contours 124A, 124B each have wedge-shaped surfaces 138. The wedge-shaped surfaces 138 form undercuts, as can be seen in Fig. 4, whereby the puzzle-like contour 123A, 123B can engage with the puzzle-like counter-contour 124A, 124B even more securely and an unintentional separation of the two end sections 121, 122 from one another can be avoided.

List of reference symbols 100 Screw connection arrangement 110 Clamping screw 111 Clamping body 112 Current bar 113 Clamping cage 114 Cross nut 115 Side wall 116 Side wall 117 Base wall 118 Ceiling wall 119 Conductor connection space 120 Flat strip material 121 First end section 122 Second end section 123, 123A, 123B Puzzle-like contour 124, 124A, 124B Puzzle-like counter contour 125 Bore 126 Recess 127 Recess 128 Threaded hole 129 Welded connection 130 Holding arm 131 Holding arm 132 Anti-twist bar 133 Anti-twist bar 134 Front side surface 135 Rear side surface 136 T-shaped projection 137 T-shaped recess 138 Wedge-shaped surface

E Insertion direction

L Ladder

Claims (10)

Expectations 1. Screw connection arrangement (100) for connecting an electrical conductor (L), with a clamping screw (110), a current bar (112) against which the conductor (L) to be connected can be clamped by means of the clamping screw (110), and a clamping body (111) which has a clamping cage (113) forming a conductor connection space (119) and a cross nut (114), wherein the clamping cage (113) has a bore (125) and the cross nut (114) has a threaded bore (128) in which the clamping screw (110) is guided, and wherein the clamping cage (113) is formed from a flat strip material (120) which is bent in such a way that it has two side walls (115, 116) arranged opposite one another, a bottom wall (117) and a Forming a tubular body having a ceiling wall (118), wherein a first end section (121) of the flat strip material (120) has at least one puzzle-like contour (123, 123A, 123B) and a second end section (122) of the flat strip material (120) arranged opposite the first end section (121) has at least one puzzle-like counter-contour (124, 124A, 124B) which engages in the at least one puzzle-like contour (123, 123A, 123B) to connect the two end sections (121, 122) to one another. 2. Screw connection arrangement (100) according to claim 1, characterized in that the at least one puzzle-like contour (123, 123A, 123B) and the at least one puzzle-like counter-contour (124, 124A, 124B) each have at least one wedge-shaped surface (138). 3. Screw connection arrangement (100) according to claim 1 or 2, characterized in that two puzzle-like contours (123, 123A, 123B) are formed on the first end section (121) and two puzzle-like counter-contours (124, 124A, 124B) are formed on the second end section (122). 4. Screw connection arrangement (100) according to one of claims 1 to 3, characterized in that the two end sections (121, 122) form one of the two side walls (115, 116). 5. Screw connection arrangement (100) according to one of claims 1 to 4, characterized in that the two end sections (121, 122) are connected by means of a welded connection (129). 6 Screw connection arrangement (100) according to one of claims 1 to 5, characterized in that on the two side walls (115, 116) of the clamping cage (113) a recess (126, 127) is formed in each case, into which the cross nut (114) engages and is held. 7. Screw connection arrangement (100) according to claim 6, characterized in that the cross nut (114) has two oppositely arranged holding arms (130, 131) which engage in the recesses (126, 127) on the two side walls (115, 116). 8. Screw connection arrangement (100) according to one of claims 1 to 7, characterized in that the cross nut (114) has two anti-twisting webs (132, 133) arranged opposite one another. 9. Screw connection arrangement (100) according to one of claims 1 to 8, characterized in that the cross nut (114) is formed from a flat strip material (120). 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.