DE29803900U1 - Contact terminal for contacting electrical lines using mutually insulated contacts - Google Patents

Description

Contact terminal for contacting electrical cables using insulated contacts.

In measurement technology, so-called four-wire contacts, also known as Kelvin contacts, are often required to electrically connect an electronic component to be tested, such as a resistor, capacitor, coil, transistor, IC, etc., to one or more electrical devices, such as a voltage source, current source, voltmeter and/or ammeter. The electrical connection of the connected devices should first be made via the test object itself.

The current state of the art already provides a solution principle for this, which is based on the fact that contact with the test object is made via two galvanically separated contact points and this is achieved by means of spring-loaded, pincer-shaped contacts that clamp the electrical component to be tested.

This clamping is achieved by mechanically holding the test object's supply line between the two surfaces of the contacts, whereby these surfaces cannot be exactly parallel to each other for cost reasons, and thus the test object's supply line is more or less contacted via an unstable two-point support.

This poses the risk that the test object will slip out of the contact terminal and measurement will no longer be possible.

The bigger problem with this type of clamping, however, is that due to a lack of guaranteed contact between the test object and both contact points due to non-parallel contact surfaces, the contacts touch each other past the test object and are therefore no longer galvanically isolated.

Another possibility for these four-wire contacts is the state of the art with a contact terminal with serrated terminals

which at least avoids the disadvantage of the test specimen slipping out of the clamp in the case of large supply line dimensions of the test specimen by means of a stable clamping between two pairs of tooth flanks.
5

In this case, measurement uncertainty only occurs when the wire of the test object's supply line is so small that when clamped between the two contacts, these contacts touch each other, and thus the test object is no longer clamped properly, and the electrical connection of the connected devices is no longer made via the electrical component to be tested.

The invention has set itself the task of eliminating the deficiencies described above and of providing a device which makes it possible to stably clamp a test object between two insulated electrical contact pairs for measuring purposes.

The solution to the problem described provides for a stable clamping of the test object's supply line using a contact clamp based on the bending beam principle, with two electrically conductive supports and an insulated abutment which presses in opposite directions between the two supports, and this clamping is achieved by slightly elastically deforming the test object's supply line, thereby creating a stable three-point support on the two contacts and the insulator. The force with which the two contacts and the insulator are pressed against one another is preferably generated by means of a torsion spring which is inserted on the axis of rotation between the two handles, or alternatively the force can also be generated pneumatically.

Show it:

Figure 1: a contact terminal in 3D view; Figure 2: a section through the contact area of a first contact terminal;

Figure 3: a section through the contact area of another

contact terminal;
Figure 4: a section through the contact area of another contact terminal;
Figure 5: a section through the contact area of another

contact terminal;
Figure 6: another embodiment of the contact terminal.

The subject matter of the present innovation arises not only from the subject matter of the individual protection claims, but also from the combination of the individual protection claims with one another.

All information and features disclosed in the documents, including the summary, in particular the spatial configuration shown in the drawings, are claimed as essential to the invention insofar as they are new compared to the prior art, individually or in combination.

The innovation is explained in more detail below using drawings showing several possible embodiments. The drawings and their descriptions reveal further features and advantages of the innovation that are essential to the invention.

Figure 1 shows a preferred embodiment of the contact clamp based on the bending beam principle according to the invention, with handle (1) and spring-operated rotary axis (5), insulator (2), contacts (3a/3b), and supply line of the test object (4).

Figure 2 shows a section through the contact area of the contact clamp with the test object in a further embodiment with cylindrical insulator (2) and cuboid-shaped contacts (3a/3b), together with the clamped supply line of the test object (4).

Figure 3 shows a section through the contact area of the
Contact clamp with the test object in a further embodiment with cylindrical insulator (2) and cylindrical contacts
(3a/3b), together with the clamped supply line of the test object (4) .

Figure 4 shows a section through the contact area of the
Contact terminal with the test object (4), in another
Embodiment with prismatic insulator (2), cylindrical
Contacts (3a/3b), together with the clamped supply line of the test object (4).

Figure 5 shows a section through the contact area of the
Contact terminal with the test object (4) in another

Design with cuboid-shaped, elastic insulator (2),
cylindrical contacts (3a/3b), together with the clamped supply line of the test object (4).

Figure 6 shows another embodiment of the contact terminal
according to the bending beam principle according to the invention with a
alternative arrangement of the handle (1) and spring-operated rotary axis (5), whereby the handle (1) to which the insulator (2) is attached is angled by 90° on the test side, and thus the test object (4) is guided onto the contacts (3a/3b) via the insulator (2)

which are attached to the front of the other handle (1).

In addition, the invention is intended to include embodiments of the described contact terminal that enable more than

to connect two electrical devices. The principle of stable clamping by bending the test object's leads between two supports and counteracting, intermediate
Counter bearing, should be the same. With three connected
Devices, according to the invention, would therefore have a contact terminal
consisting of a handle, three contacts and two insulators or
Isolator cams exist.

I1

Drawing legend

1 handle

2 Insulator

3a Contact

3b Contact

4 Examination item

5 spring-loaded rotary axis 10

Claims (6)

: ::.. PATENTANtoAiSr *****' • · · ·» · · · »«jjj DR.-TnG. PETER RIEBLING Dipl.-Ing. EUROPEAN PATENT ATTORNEY PO Box 3160 D-88113 Lindau (Bodensee) Telephone (08382) 78025 + 9692-0 Fax (08382) 78027 + 9692-30 15
I11121.7-P528-58 1 11.02.1998 u Applicant: Precision Motors Dt. Mineba GmbH, 8J Max-Planck-Str. 14, 78549 Spaichingen S-5 Protection of claims I 1. Contact clamp for contacting electrical supply lines I 25 by means of two mutually galvanically insulated contact points ⁵ for the connection of electrical devices, which consist of two handles (1) acting on one another via a rotary axis (5), characterized in that two separate, electrically conductive, rod-shaped contacts (3a/3b) are attached to these handles (1) on one side and a rod-shaped insulator (2) is attached on the other, opposite side, which presses between the contacts (3a/3b) by the spring load on a supply line of the test object (4) in such a way that it is slightly elastically deformed and is thus stably clamped, whereby a reliable contact necessary for the test process is established. Home address: Bank accounts: Postal checking account Rennerle 10 Bayer. Vereinsbank Undau (B) No. 1257110 (bank code 600202 90) Munich D-88131 Lindau Hypo-Bank Undau (B) No. 6670-326843 (bank code 73320442) 414848-808 Volksbank Undau (B) No. 51222000 (bank code 65092010) (bank code 70010080) VAT number: DE 129020439 2. Contact terminal for contacting electrical supply lines according to claim 1, characterized in that the insulator (2) is cylindrical, cuboid-shaped or prismatic. 3. Contact terminal for contacting electrical supply lines according to claim 1 and 2, characterized in that the insulator (2) consists of elastic plastic or rubber. 4. Contact terminal for contacting electrical supply lines according to one of claims 1-3, characterized in that the contacts (3a/3b) are cylindrical, cuboid-shaped or prismatic. 5. Contact terminal for contacting electrical supply lines according to one of claims 1-4, characterized in that the contacts (3a/3b) consist of an electrically conductive material. 6. Contact terminal for contacting electrical supply lines according to one of claims 1 - 5, characterized in that more than two contacts (3a/3b) and more than one insulator (2) are each attached to the handles (1), but one insulator (2) less than the number of contacts (3a/3b).