SK174897A3 - 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 flags which are always insertable from their side into the pocket-like clamping part of the installation apparatus and can be contacted there by spring-elastic contact.

BACKGROUND OF THE INVENTION

Such a contact device is known from EP 0467171 A2. For this purpose, inside the installation apparatus, spring-like contact formations are arranged in relation to one another in the manner of a clamping jaw, which surround the connection flags of the associated busbar on both sides. The electrical contact to the connection flag is always produced through 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.

SUMMARY OF THE INVENTION The object of the invention is to improve the plug-in contact device of the above-mentioned type at low cost so as to ensure a secure connection between the busbar connection flags and the corresponding clamping part of the installation devices with low transient resistance.

SUMMARY OF THE INVENTION

This task is solved by a contact device with characters

A further embodiment and a preferred embodiment of the invention are set out in the dependent claims.

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 both on the side and a plug-in contact from the underside of the device, independently of one another, for a screw connection, usually common in installation devices.

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 for the connection flags are relatively small.

BRIEF DESCRIPTION OF THE DRAWINGS

The invention is explained in more detail below with reference to an exemplary embodiment according to the attached diagrammatic representation of contact installation devices.

FIG. electric devices

DETAILED DESCRIPTION OF THE INVENTION

Only a schematically illustrated contact device is arranged in the housing base of the installation device (not shown) and is provided with a clamping part 7 which is connected in one piece to the screw terminal 12. It consists in itself in a known manner of a clamping block 2.1, which is screwable 2.2 against the pushing part 2.3 by means of screws 2.2. In this way, the wires according to the arrow 2.4 can be connected from the side to the installation device in a traditional manner.

In the area below the clamping block 2.1, the clamping part 1 is mainly formed immediately as an extension of the pushing part 2.3. This is a commercially available cylindrical compression spring, the axis of which extends in a direction perpendicular to the plane of the drawing. At least after insertion into the frame part 1.1, the threads of the spring body, which are secured against falling out only by the schematically indicated housing outline 4, are relatively close together. On the circumferential side, the spring body 3 can in turn be supported on the bearing surface i.2 together with the angle 1.2 so that a gap remains in relation to the opposite contact surface 1.3, the width of which depends on the dimensions of the connecting flag 5 1 .5.

These pin-like or tongue-like connection flags 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 on the underside of the apparatus. Above this opening, therefore, the gap between the contact surface 1.3 and the housing surface of the spring body 3 is adapted to a smaller dimension to the thickness of the attachment flag 5.1, so that after insertion of the respective attachment flag in the arrow direction 5.2, the respective cylindrical spring body is radially loaded and formed into an oval. The individual threads of the spring body abut against the connection flag 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 electrically connected to the clamping part 1 via 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 large 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 the cause may lie in the busbar.

5. as a part that is supplied by different manufacturers. Furthermore, the contact force can be adapted to the technical requirements in a wide range over the diameter of the spring body 3 as well as the wire used for manufacturing. On the other hand, the insertion forces for the connection flag 5.1 are relatively small because of the spring body

3. can perform a rolling movement about its longitudinal axis with minimal friction in the insertion process inside the frame part 1.1.

The length of the spring body is dependent on the thickness of the frame part 11 and is adapted to the width of the conventional connection flags with a sufficient margin, the end thread abutting on the frame part with a slight pretension. For this purpose, the cylindrical spring body 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 Contact device in electrical installation apparatus for plug-in connection with pin-like or tongue-like connection flags which can be inserted from their side into the pocket-like clamping part of the installation device and spring-elastically contactable there, characterized in that in the clamping part (1) a hollow cylindrical spring body (3) is provided, by means of which a contact force between the respective connection flag (5.1) and the contact surface (1.3) of the clamping part can be generated from the periphery. A contact device according to claim 1, characterized in that it comprises: That the spring body (3) has the shape of a compression spring, the threads of which, however, lie relatively closely together and are radially loaded. 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 is secured with an axis running in a direction perpendicular to the insertion direction of the connection flag (5.1). only against falling out. Contact device according to claims 1 and 3, characterized in that the spring body (3) can be supported 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 and 4, characterized in that the clamping part (1) is formed as part of a screw connection terminal (2) and is arranged mainly on its underside inside the device socket. Contact device according to one of Claims 1 and 5, characterized in that the clamping part (1) has a separate frame part (1.1) which surrounds the contact surface (1.3) in a grid-like manner, connected to the screw connection clamp (2) and a spring body (3). Contact device according to one of Claims 1 and 5, characterized in that the clamping part (1) is formed below the clamping body (2.1) of the screw connection clamp (2) as a cage-like extension supporting the interposed spring body (3) against the plugging force of the flags (5.1). Contact device according to one of Claims 1 to 7, side-by-side line circuit breakers or other devices which can be installed in series, characterized in that the connection flags (5.1) are arranged on a pin-shaped busbar (5) for and are always pluggable from the bottom of the device socket through the housing opening (4.1) into the clamping part (1).