DE7914951U1 - Spring contact device for measuring and testing purposes - Google Patents

Description

■ The invention relates to a resilient contact device for measuring and testing purposes of a device as defined in the preamble of claim 1.

Design type.
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When the contact device 64 is designed, the HCQ.se and the connection terminal attached to it are separate components, between which helical springs are arranged which rest on the front of the connection elements. The contact modules are therefore quite long, which results in a high manufacturing cost and there is a risk that they will buckle when contact is made.

The object of the invention is to eliminate these deficiencies and to achieve a shorter length of the contact device. (*

To solve this problem, the invention proposes to form the connection elements in one piece with the sleeves as a tube body and to support the coil springs on the flanges of the connection elements.

Such contact devices can be made significantly shorter with the same spring length and thus the same spring characteristic; they can therefore also be used for conventional adapter plates. A long helical spring can be accommodated in the smooth-walled tubular body, which has an increased resistance to breakage and a desired flatter spring characteristic with the same spring force. In addition, a long guideway is available for the contact piston, which creates favorable friction and current conduction conditions.

An embodiment of the invention is shown in the drawing and is explained below.

Bs show:

Fig. 1 Schematic representation of a contact device on an electronic circuit board;

Fig. 2 Longitudinal section through a contact module.

In the contact device according to Fig. 1, many sleeves 1 lying parallel to one another are pressed into an adapter plate 2. In a practically designed contact device, the adapter plate 2 contains about 10,000 sleeves with an external diameter of about 1 μm. At one end 3, the contact pistons 4 protrude from the sleeves 1 and contact an electronic circuit board 6 with their tips 5. At the other sleeve ends 7, connection elements 8 are attached as concentric joints, so that together with the sleeves 1 they form one-piece tube bodies with a smooth inner wall. The connection elements 8 rest on a stop plate 9 which is screwed to the adapter plate 2. Each connection element has a soldering point 10 to which a conductor line (not shown for the sake of clarity) from the probe to a measuring device is soldered. The soldering points 10 are arranged along the connection elements 8, each offset from one another by a few millimeters.

As shown in Fig. 2, screw bolts 11 are inserted into the sleeves 1 and connecting elements 8, which on the one hand rest against the contact piston 4 and on the other hand against the flanged holes 12 of the connecting elements 8.

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Claims (3)

eprttehe Spring-loaded contact device for measuring and testing purposes, with two sleeves lying parallel to one another in an adapter plate, in one of whose sleeves contact pistons are fitted so as to be longitudinally movable, which serve to make contact with electronic circuit boards and in doing so brace springs arranged in the sleeves , whereby the helical spring is supported on stop elements which are attached concentrically to the other sleeve ends ^and are externally indicated ^{at the locations} for conducting ^the test current. 2. Contact device according to claim 1, characterized in that the sleeves (i) and connecting elements ( ft ) are designed as a coaxial body with smooth inner wall . 3. Contact device according to claim 1, characterized in that the helical springs (ii) are guided in the head tubes (i, 8) to prevent them from buckling and rest against the spring guides (i2) of the connecting elements (8).