Electrical connectors – Metallic connector or contact having movable or resilient... – Screw-thread operated securing part
Reexamination Certificate
1999-02-02
2001-04-03
Paumen, Gary F. (Department: 2833)
Electrical connectors
Metallic connector or contact having movable or resilient...
Screw-thread operated securing part
Reexamination Certificate
active
06210239
ABSTRACT:
THE FIELD OF THE INVENTION
The invention relates to a contact element with a screw-type terminal for electric conductors, wherein the contact element comprises a conductor connection part provided with a bore, into which the conductor is insertable and clampable by means of a screw insertable at right angles to the bore and/or conductor into a threaded bore in the conductor connection part, and wherein between the end of the screw directed towards the conductor and the conductor a wire protection plate is provided in the bore.
With such screw-type terminals, it is necessary to provide a wire protection element so that the conductor to be connected is not damaged by the terminal screw when the latter is tightened.
From DE-GM 19 65 790 it is known, with such contact elements, to snap a substantially U-shaped wire protection plate onto the barrel of the terminal screw, one end of the wire protection plate being disposed between the screw and the conductor to be connected. In said case, upon tightening of the screw, the wire protection plate is displaced axially with said screw. Given said construction, however, it is necessary for the screw and the wire protection plate to be prefabricated into a subassembly, which is then inserted into a support body of a plug-in connector and has to be locked in said support body by means of an additional contact retention plate.
SUMMARY OF THE INVENTION
The object of the invention is to design a contact element of the type described initially, i.e. the screw-type terminal thereof, in such a way that it is insertable into a support body and retained therein without additional retaining means being required.
Said object is achieved in that the wire protection plate is substantially L-shaped and comprises an angled foot, that the wire protection plate is inserted into the bore in such a way that the foot is situated at the base of the bore, and that the foot is provided with lateral, barb-like mouldings which, upon insertion of the wire protection plate, dig into the wall of the bore.
Advantageous refinements of the invention are indicated in claims
2
to
4
.
The advantages achieved by the invention are, in particular, that a contact element which is simple and inexpensive to manufacture has been created by virtue of designing the wire protection plate and its retention device in accordance with the invention. Said contact element is insertable without difficulty into a location chamber of the support body and no separate contact retention plate is required for its retention.
A further advantage is provided, given a wire protection plate having a reinforced limb and a rounded transition between the foot and the limb, in that the reinforced region is not deformed during tightening of the terminal screw and the resilient properties of the rounded transition remain unaffected. As a result, the wire protection plate presents optimum elastic and elastic recovery properties.
A further advantage is provided, given the fashioning of the conductor insertion bore with a tulip-shaped insertion region and a correspondingly adapted limb of the wire protection plate and the use of a terminal screw with a spherical tip, in that the distance between the point of introduction of force and the point of support of the wire protection plate against the conductor/stranded conductor is considerably reduced compared to conventional constructions. The resultant effect is that, given an identical tightening torque of the screw, the flexural stress of the component is virtually halved, with the result that the return deformation is increased and the service life prolonged.
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Ferderer Albert
Harting Dietmar
Cook Alex McFarron Manzo Cummings & Mehler, Ltd.
Harting KGAA
Paumen Gary F.
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