SK282939B6 - Contact means for electric installation equipment - Google Patents

Abstract

Contact means for electric installation equipment have pin-shaped or tongue-shaped connecting lugs (5.1) that can be plugged into a pocket-shaped clamping piece (1) of the installation equipment and elastically establish a contact therein. In order to ensure with such contact means a reliable and lasting connection between the connecting lugs (5.1) of a bus bar (5) and the corresponding clamping piece (1) with a low transfer impedance, a hollow cylindrical spring body (3) is arranged in the clamping piece (1) to generate at the periphery the contact forces between the connecting lug (5.1) and a contact surface (1.3) of the clamping piece (1). The spring body (3) is preferably shaped as a pressure spring whose windings however are relatively closely spaced and radially biased. These contact means are particularly suitable for electrically connecting circuit breakers and other serial built-in equipment to commercially available, pluggable bus bars.

Description

Technical field

The invention relates to a contact device in electrical installation apparatus for plug-in connection with pin-like or tongue-like parts which are always insertable from their side into the pocket-like clamping part of the installation apparatus and can be resiliently elastically contactable there.

BACKGROUND OF THE INVENTION

Such a contact device is known from DE 94 18 316 U1.

Furthermore, a contact device is also known from GB 1 441 102 which shows a connecting element, for example for cables or the like, which uses a coil spring. This coil spring is arranged in the pocket-shaped clamping part so that the wire to be fastened or the connecting parts can be pushed in their axial direction, the spring being pivotable in the axial direction in order to release the insertion path for the connecting parts.

A further contact device is known from EP 0467171 A2. For this purpose, inside the installation apparatus, roasting contact formations are arranged opposite one another in the manner of a clamping jaw, which surround the connection portions of the associated busbar on both sides. The electrical contact to the connection portion is always produced by the elasticity of the material of the contact formations. In this device, the contact forces are very dependent on tolerances and can become tired after long-term use with frequent temperature changes.

It is an object of the invention to improve, at low cost, a plug-in contact device of the kind mentioned in such a way that a secure and detachable connection between the connection parts and the corresponding clamping part of the installation devices with low resistance is ensured.

SUMMARY OF THE INVENTION

The aforementioned drawbacks are largely eliminated by the contact device in the electrical installation apparatus for plug-in connection with pin-like or tongue-like connection portions which can be inserted into the pocket-like clamping part of the installation apparatus and are spring-elastically contactable therein. A hollow cylindrical spring body is provided for exerting a contact force from the circumferential side between the respective connecting parts and the contact surface of the clamping part, the spring body extending in the axial direction in the clamping part is arranged perpendicular to the insertion direction of the connecting parts.

In a preferred embodiment, the spring body is in the form of a compression spring whose coils lie close together and are radially loadable.

In a further preferred embodiment, the spring body is loosely inserted into the frame part of the clamping part and secured against falling out.

It is also advantageous if the spring body is supported against the contact surface of the clamping part against the contact surface.

In a further preferred embodiment, the clamping portion is a screw terminal clamp portion and is preferably arranged on its underside inside the cap.

In a further preferred embodiment, the clamping part has a separate frame part which lattically surrounds the contact surface connected to the screw connection terminal and a spring body.

Advantageously, the clamping part is formed below the clamping body of the screw connection clamp as a cage-like extension supporting the intermediate spring body against the insertion force of the coupling parts.

In a preferred embodiment of the contact device, especially for side-by-side line circuit breakers or other devices which can be installed in series, the connection parts are arranged on a pin-shaped busbar serving for power supply and are retractable from the underside of the socket through the opening.

The invention has the advantage that the contact device is very small and can therefore be disposed in the socket of the device under the existing screw connection terminal with which it is also to be connected. This makes it possible for both the screw connection, usually common in installation devices, to be made from the side and the plug-in contact from the underside of the device independently of one another.

Furthermore, large tolerances in dimensions can be bridged and a uniform contact force with multiple contact points can be achieved depending on the number of turns of the spring body. On the other hand, due to the rotatable movable arrangement of the spring body, the insertion forces on the connecting parts are relatively small.

Overview of the figures in the drawing

The invention is explained in more detail below with reference to the accompanying drawing, in which: FIG. schematically shows a contact device for electrical installation devices.

DETAILED DESCRIPTION OF THE INVENTION

Only a schematically shown contact device is arranged in a housing base of a not shown installation apparatus and is provided with a clamping part 1 which is connected in one piece to a screw clamp 2. This consists in itself in a known manner of clamping block 2.1 which can be disengaged against screws pusher part 2.3. In this way, the wires of the electrical conductor according to the arrow 2.4 can be traditionally connected from the side to the installation device.

In the region below the clamping block 2.1, the clamping part 1 is formed mainly as an extension of the pushing part 2.3, provided with a frame part 1.1 which is shaped in the form of a pocket and which comprises a spring body 3. This is in principle a conventional cylindrical compression spring. runs in a direction perpendicular to the plane of the drawing. At least after insertion into the frame part 1.1, the threads abut the schematic outline 4 of the housing, relatively closely together. On the circumferential side, the spring body 3 can, on the other hand, rest against the bearing surface 1.2,1.2 'together with the angle so that a gap remains against the opposite contact surface 1.3, at the dimensions of the connecting portion 5.1 projecting on the busbar 5.

These pin-like or tongue-like connection portions 5.1 are arranged several times in a row on a dividing scale of installation devices on commercially available busbars and, quite generally, serve for electrical connection to a series of built-in devices. In addition to the usual use for the screw connection terminal 2, here, however, the busbar serves as a plug-in connection to the contact device via the housing opening 4.1 of the housing bottom. Above this opening, therefore, the gap between the contact surface 1.3 and the surface of the housing of the spring body 3 is adapted to a smaller dimension to the thickness of the connecting part 5.1, so that after insertion of the respective connecting part in the direction of arrow 5.2 the respective cylindrical spring body is radially loaded. The individual threads of the spring body abut against the connecting part and press against the contact surface 1.3. At the same time, this spring force is also transmitted to the bearing surface 1.2, which is conductively connected to the clamping part 1 through the frame part 1.1. Therefore, if the spring body 3 is made of a material with good electrical conductivity, the current conduction is further improved.

Due to the great radial formability of the spring body 3, considerable tolerances can be bridged at almost the same contact force, which arise in the installation device, however, due to production, but in particular may be caused by the busbar 5 as a part supplied by different manufacturers. In addition, the contact force in a wide range can be adapted to the technical requirements over the diameter of the spring body 3 as well as the wire used for manufacturing. On the other hand, the insertion forces on the connection part 5.1 are relatively small, since the spring body 3 can perform a rolling movement about its longitudinal axis with minimal friction during the insertion process inside the frame part 1.1.

The length of the spring body 3 is dependent on the thickness of the frame part 1.1 and, with a sufficient margin, is adapted to the width of the usual connecting parts 5.1, the end thread abutting with a slight pretension to the frame part 1.1. For this purpose, the cylindrical spring body 3 could be made not of wire but also of a flat spring band, for example in the form of a clamping sleeve, without departing from the scope of the invention.

Claims (8)

PATENT CLAIMS Contact device in electrical installation apparatus for plug-in connection with pin-like or tongue-like connection portions (5.1) which can be inserted from their side into the pocket-like clamping part (1) of the installation apparatus and therein elastically contactable therein, characterized in that a hollow cylindrical spring body (3) is provided for exerting a contact force from the peripheral side between the respective connecting parts (5.1) and the contact surface (1.3) of the clamping part (1), the spring body (3) extending in the axial direction in the clamping part (1), it is arranged perpendicular to the insertion direction of the connecting parts (5-1). Contact device according to claim 1, characterized in that the spring body (3) is in the form of a compression spring, the coils of which lie close together and are radially loadable. Contact device according to claims 1 and 2, characterized in that the spring body (3) is loosely inserted into the frame part (1.1) of the clamping part (1) and secured against falling out. Contact device according to one of Claims 1 to 3, characterized in that the spring body (3) bears against the contact surface (1.3) against the contact surface (1.2, 1.2 ') of the clamping part (1). Contact device according to Claims 1 to 4, characterized in that the clamping part (1) is part of a screw connection clamp (2) and is preferably arranged on its underside inside the socket. Contact device according to one of Claims 1 to 5, characterized in that the clamping part (1) has a separate frame part (1.1), which gratefully surrounds the contact surface (1.3) connected to the screw connection clamp (2) and a spring connection body (3). Contact device according to one of Claims 1 to 5, characterized in that the clamping part (1) is formed below the clamping block (2.1) of the screw connection clamp (2) as a cage-like extension supporting the intermediate spring body (3) against the insertion force. connecting parts (5.1). Contact device according to one of Claims 1 to 7, in particular a line circuit breaker, or other devices which can be installed in series, characterized in that the connecting parts (5.1) are arranged on a pin-shaped busbar (5), they are pluggable from the bottom of the socket through the opening (4.1) of the housing into the clamping part (1).