DE2716393A1 - CONTACT ELEMENT FOR USE IN THE CONTACT CHAMBER OF AN INSULATING BODY - Google Patents

Description

PATENT ADVOCATES A. GRÜNECKER

DtPL-ING.

H. KINKELDEY

DR-INCl

\ W. STOCKMAIR

K. SCHUMANN

. OR RER NAT OWL - »" ΜΥΑ

P. H. JAKOB

on.-iNa

G. BEZOLD

or nm mat - an_-o «m

8 MUNICH

MAXIMIUANSTRAS9E

April 13, 1977

PH 11357 - 50 / height

Blinker Ramo Corporation
Commerce Drive
Oak Brook, 111. 60521
United States

Contact element for use in the contact chamber of a

Insulating body

The invention "relates to a contact element for use in the contact chamber of an insulating body, with a securing element which can be pressed against the wall of the chamber under clamping action and which holds the contact element in the contact chamber.

809842/0286

TELEPHONE (O8O) 93aaes TELEX O5-Q838O TFI EORAMME MONAPAT TELECOPER

There are many ways of attaching electrical contact elements known in the Kontaktkainmern of insulating bodies. For example one often uses contact elements with locking lugs behind a shoulder provided in the contact chamber snap and can be lifted off the shoulder using a specially designed release tool to restore the contact element to be released from the contact chamber. However, the formation of shoulders in the contact chambers requires relatively complex tools for manufacturing the insulating body. In many cases one is not interested in the contact element after use to be able to solve again in the contact chamber. For this purpose, connectors are known whose insulating bodies have contact chambers, which have no shoulders and in which the contact elements are only inserted into the contact chamber with a clamping effect will. As an example of such a connector, socket strips according to DIN 41612 (for example 64-pin) are on the Market available, are inserted into the contact elements, the have a latching part bent into a U-shape in cross section whose U-legs are dimensioned in their length so that they are clamped rest on opposite walls of the contact chamber. Uia to increase the clamping effect, it is known to use either the free ones To provide the ends of the U-legs with teeth or on the outside Provide clamping nipple at the base of the U-leg. The disadvantage of these contact elements is that the clamping effect achieved for many applications is not high enough, so that the contact element by pulling on the soldered conductor can be pulled out of the contact chamber. It must also be relatively tight to maintain a required minimum clamping force Manufacturing tolerances for the contact element and the insulating body be respected. With the usual use of such contact elements In multi-pole strips, the relatively thin, less elastic chamber walls are often damaged when they are inserted

8098 ^ 2/0286

on, because the U-legs of the contact renewed under a press fit in the contact chamber can be used.

The present invention is based on the object of developing a contact element of the type specified at the outset in such a way that, even with larger manufacturing tolerances, a sufficient clamping effect is ensured without damaging the possibly thin chamber walls between closely adjacent chambers .

This object is achieved according to the present invention by the characterizing part of the main claim.

If one tries to pull out such a contact element again after it has been inserted into the contact chamber, the end of the locking finger digs into the wall of the contact chamber and anchors the contact element securely in the contact chamber. The flexibility of the locking finger also compensates for larger manufacturing tolerances, since the angle at which the locking finger rests on the wall of the contact chamber is not critical. Such a contact element can also be introduced very easily into the contact chamber without any great expenditure of force, without the wall of the contact chamber being damaged during insertion.

A preferred embodiment of the contact element is specified in claim 2. By punching out the locking finger and bending it out of the U-shaped latching part, a contact element can be obtained that can be manufactured very cheaply , since practically no additional work is required for the locking finger.

By the embodiment according to claim 3 leads to increased barrier effect, because the burying of the free end of the locking finger in the chamber wall facilitates v / ill.

809842/0266

The development according to claim 4- leads to a relatively high dimensional stiffness of the locking finger due to the curvature of the locking finger, so that he is also able to absorb larger forces. In addition, this creates two in the corners of the locking finger tips burying the chamber walls.

Practice has shown that the inclination of the locking finger by about 100 ° relative to the direction of insertion, even with larger ones Tolerance deviations in the dimensions of the insulator and the contact element leads to a good blocking effect in practically all cases.

The invention is explained in more detail below using an exemplary embodiment shown in the drawing. It demonstrate:

Fig. 1 shows the circuit board of a designed as a contact spring contact element according to the invention;

FIG. 2 shows a front view of the contact spring bent from the circuit board according to FIG

Fig. 3 is a side view of the contact spring, which is in a Contact chamber shown in section is used.

The contact spring shown in the drawings is stamped in one piece from sheet metal. The punched circuit board is shown in FIG. 1. This board consists of a rear connection part 1, a front having two contact arms 2a and 2b Contact part 2 and a central locking part 3 · The one shown in FIG The sinker is essentially around its central longitudinal line bent so that the locking part 3 is given a U-shaped cross-section. the

"Both legs of this U-shaped cross-section are denoted by the reference symbols 4a and 4b. From the bottom part of the locking part 3 is a Locking finger 5 punched out and at its base 6 opposite the Bottom part bent so far that it assumes an angle of about 110 ° with respect to the direction of insertion indicated by A. The length of the Locking finger is dimensioned so that it protrudes slightly beyond the two legs 4a, 4b. A slightly larger one around the locking finger 5. Stiffness to give, it is, as Fig. 2 best shows, slightly curved about its longitudinal axis.

3 shows a section through part of an insulating body 7 into which a contact spring is inserted into a contact chamber 8 is. V / ie this figure shows, the bottom part of the U-shaped locking part rests against the left wall of the contact chamber, while the end of the locking finger 6 is supported on the right wall of the contact chamber.

Due to the spring force exerted by the locking finger 5, the bottom part of the latching part 3 is slightly pressed against one wall of the contact chambers. Depending on the sheet thickness selected and the curvature of the locking finger, this pressure can be kept relatively small, so that there is no risk of damage to the wall of the contact chamber by the free end of the locking finger when the contact is introduced into the contact chambers. If you now try to pull on the connection part 1, the end of the locking finger 5 digs slightly into the wall of the contact chamber and secures the contact element firmly in the contact chamber. In order to increase this securing effect a little, the end of the locking finger 5 can still be slightly beveled so that it digs into the wall like a hessian or a chisel.

In the drawing, only a contact spring has been shown as an example. This construction principle with locking fingers

809842/0286

can of course also be used for pin contacts. The main application of such contact elements is in the case of rionoblock insulators, which do not have any in the contact chamber Stops or steps are provided on which the contact element could be secured in other ways.

809842/0266

Claims (5)

PATENIAN LAWYERS A. GRÜNECKER OH. ING H. KINKELDEY ^fc W. STOCKMAIR K. SCHUMANN OH RCR m \ r WL PMVS P. H. JAKOB OPL-ING G. BEZOLD ORHEHNAT OtPL-O «SA 8 MUNICH MAXIMILIANSTRASSE April 13, 1977 PH 11557 - 50 / HÖ. Claims Contact element for use in the contact chamber of a Insulating body, with a securing element which can be pressed against the wall of the chamber under a clamping effect, the holds the contact element in the contact chamber, characterized in that the Safety element is designed as a flexible locking finger (5) facing the direction (A) in which the contact element is inserted into the contact chamber (8), assumes an angle of slightly more than 90 °. 2. Contact element according to claim 1, characterized in that that it is formed in one piece from a sheet metal body and in a between the contact ri «. _E FOHi · .-, ο, » _JJÖ , _1CI , ,,, ^ ORIGINAL INSPECTED poor (2a, 2b) and a connecting part (1) lying latching part (3) is formed with a U-shaped cross-section, and that the locking finger (5) is punched out of the foot part (6) of the U-shape and is located between the legs (4a, 4b) of the U-shape extends beyond its lateral edges. 3- contact element according to claim 1 or 2, characterized characterized in that the edge at the free end of the locking finger (5) is beveled. 4-, contact element according to one of claims 1 to 3i, characterized in that the locking finger (5) is arched in cross section. 5. Contact element according to one of claims 1 to 4-, characterized in that the inclination of the locking finger (5) opposite the insertion direction (A) is about 100 °.