Electrical connectors – Metallic connector or contact having movable or resilient... – Screw-thread operated securing part
Patent
1991-08-22
1993-07-13
Desmond, Eugene F.
Electrical connectors
Metallic connector or contact having movable or resilient...
Screw-thread operated securing part
439812, H01R 438
Patent
active
052268411
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a clamping device for making an electrical connection, with a tightening nut which can be screwed onto a screw thread of the clamping device and, when adjusted in an axial direction, exerts a clamping force on a part which cannot be moved in the axial direction.
Such clamping devices are used, for example, in so-called pole clips for coupling lines to equipment in the category of entertainment electronics. They are characterized by the fact that connecting and disconnecting the leads can easily be carried out by hand. However, clamping devices of the type stated are also used in so-called cinch (RCA) plugs, in which the cover sleeve which can be axially screwed onto the plug element exerts axially and radially directed clamping forces on an outer ring contact of the cinch (RCA) plug, which is conical on the outside and provided with axial longitudinal slits, with one end (cf. DE-GM 84 36 689. The radially directed clamping forces produced in this way result in a particularly secure hold of the outer ring contact on the outer ring contact of the corresponding bushing, which hold will not come loose.
A disadvantage of the known clamping devices consists of the fact that when the clamping force is produced, a strong friction between the tightening nut and the part which cannot be moved in an axial direction occurs, directed against the rotational movement of the tightening nut. Due to this friction, scoring or other damage occurs at the part which cannot be moved axially. Furthermore, this friction hinders the rotational movement of the tightening nut and thus impairs the tightening and loosening process.
It is therefore the task of the invention to further develop the clamping device of the type stated initially, in such a way that scoring or comparable damage to the axially fixed part is avoided, and the tightening and loosening process is facilitated.
To accomplish this task, the invention proposes, based on the clamping device of the type stated initially, that the tightening nut is provided on the clamping side with a separate pressure piece which transmits the clamping force, which is mounted on the tightening nut so as to rotate around the screw thread axis.
With the pressure piece mounted to rotate around the screw axis, the friction which hinders the screwing process in the circumference direction is significantly reduced, so that the tightening and loosening process is correspondingly facilitated.
Since a relative displacement between the axially fixed part and the pressure piece no longer takes place during the tightening process, scoring and other damage to the part fixed in the axial direction is avoided.
A first embodiment of the invention provides that the clamping device is structured as a pole terminal, with a metallic conductive element, which is provided with the screw thread for the tightening nut and with a cross-bore to hold an electric lead, which can be clamped in place in the bore by means of the tightening nut, where the pressure piece is structured as a ring element, which can be moved over the opening cross-section of the cross-bore.
In advantageous manner, the ring element has a ring-shaped projection facing inward, which engages behind a ring shoulder on the tightening nut. With this sample mounting of the ring element on the basic part, the ring element is securely held and guided on the tightening nut in an axial direction, during the tightening and loosening process.
It is practical if the ring element is furthermore provided with a paving-stone pattern milled surface on the clamping side, which increases the friction. This milled surface increases the adhesive friction between the fixed part and the ring element, so that the latter cannot also turn when the tightening nut is turned.
Furthermore, both the conductive element and the tightening nut can be provided with a contact protection, where the ring element can be turned within the contact protection of the tightening nut. Such contact protection prevents unintentional touching of a pole terminal w
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