Self-stripping electrical connector

Abstract

A self-stripping electrical connector has a grounded bar formed with at least one threaded bore, a dielectric lower support part secured to the bar over the bore and formed with two adjacent outwardly open lower guide passages, a pair of electrically conductive and generally parallel lower tubes having lower ends formed with slots aligned with the respective lower passages and upper ends also formed with slots, and respective guides on the lower support part carrying the tubes for movement toward and away from the bar with the lower-end slots aligned with the respective lower passages. A dielectric upper support part overlies the lower part and is formed with two adjacent outwardly open upper guide passages aligned with the upper-end slots of the respective tubes. A screw is engageable through both of the parts and into the bore of the bar for pressing the upper part down on the lower part and for pressing the tubes down in the lower part and thereby wedging wires in the passages and aligned with the respective slots thereinto.

Description

donwnward downward against the top of the sleeve 31'. Thus as soon as the portion 32 leaves the bore 92 it will snap up and engage the sleeve 31' so it can be screwed therein by the slot on the screw head.

The connector 3 is shown in FIGS. 9 and 10. The extension 7 is molded integrally with the part 6, has a removable cover 41, and contains a lightning arrester 42 provided with terminals 43 and 44 engaged in the lower slots of the respective upper tubes 28 and 29 and in the upper slots of the respective lower tubes 18 and 19, and in fact serving to keep them from rotating in the respective bores. In addition this device 42 has a central contact 45 bearing against the metallic screw 10 which is a very good ground. Thus any sudden overvoltage in either of the lines 16, 26 or 17, 27 will be shunted to ground. Otherwise the connector 3 is used identically to the connector 2.

Claims

1. A self-stripping electrical connector comprising:

a grounded bar formed with at least one threaded bore;

a dielectric lower support part secured to the bar over the bore and formed with two adjacent outwardly open lower guide passages;

a pair of generally parallel and electrically conductive lower tubes having lower ends formed with slots aligned with the respective lower passages and upper ends also formed with slots;

guides on the lower support part carrying the tubes for movement toward and away from the bar with the lower-end slots aligned with the respective lower passages;

a dielectric upper support part overlying the lower part and formed with two adjacent outwardly open upper guide passages aligned with the upper-end slots of the respective tubes;

means including a screw engageable through both of the parts and into the bore of the bar for pressing the upper part down on the lower part and for pressing the tubes down in the lower part and thereby wedging wires in the passages and aligned with the respective slots into the tubes.

2. The self-stripping electrical connector defined in claim 1, further comprising

means for retaining the screw in the upper part against removal therefrom.

3. The self-stripping electrical connector defined in claim 1, further comprising:

a dielectric intermediate support part secured between the upper and lower parts; and

a pair of generally parallel and electrically conductive upper tubes fixed in the intermediate part having lower ends engageable in the upper ends of the lower tubes and upper ends formed with slots aligned with the respective upper passages and upper ends also formed with slots, the screw passing through the intermediate part between the tubes.

4. The self-stripping electrical connector defined in claim 3, further comprising

a threaded sleeve surrounding the screw and fixed in the intermediate part, the screw having

a head capable of bearing toward the bar on the upper part,

a threaded lower end threadedly engageable with the bar and with the threaded sleeve,

a small-diameter shank between the head and the threaded end capable of sliding through the sleeve, and

a shoulder engageable away from the bar against the upper part on threaded engagement of the threaded end in the sleeve, whereby screwing the threaded end up into the sleeve pushes the upper part off the intermediate part.

5. The self-stripping electrical connector defined in claim 3, further comprising

an overvoltage protector carried on the intermediate part and having respective input conductors connected to the upper tubes and an output conductor normally in electrical contact with the screw.

6. The self-stripping electrical connector defined in claim 5 wherein the protector is fixed to the intermediate part.

7. The self-stripping electrical connector defined in claim 6 wherein the intermediate part is unitarily formed with a housing containing the protector.

8. A self-stripping electrical connector comprising:

a grounded bar formed with at least one threaded bore;

a dielectric lower support part secured to the bar over the bore and formed with

a central throughgoing hole,

a pair of upwardly open side holes substantially parallel to and flanking the central hole,

an upwardly directed boss in each of the side holes, and

respective lower wire guides forming respective guide passages opening laterally into the side holes generally level with an uppermost part of the respective boss;

respective generally parallel lower tubes having large-diameter lower ends formed with slots aligned with the respective lower guide passages and small-diameter upper ends also formed with slots, the lower ends of the tubes being slidable in the respective side holes and engageable over the respective boss therein;

a dielectric upper support part overlying the lower part and formed with

a central throughgoing hole,

a pair of downwardly open side holes substantially parallel to and flanking the respective central hole and of generally the same diameter as the upper tube ends, and

respective upper wire guides forming respective guide passages opening laterally into the respective upper side holes in line with the slots of the upper ends; and

means including a screw engageable through the center holes of both of the parts and into the bore of the bar for pressing the upper part down on the lower part and for pressing the tubes down in the lower part and thereby wedging wires in the passages and aligned with the respective slots into the tubes.

9. A self-stripping electrical connector comprising:

a grounded bar formed with at least one threaded bore;

a dielectric lower support part secured to the bar over the bore and formed with

a central throughgoing hole,

a pair of upwardly open side holes substantially parallel to and flanking the central hole,

an upwardly directed boss in each of the side holes, and

respective lower wire guides forming respective guide passages opening laterally into the side holes generally level with an uppermost part of the respective boss;

respective generally parallel lower tubes having large-diameter lower ends formed with slots aligned with the respective lower guide passages and small-diameter upper ends also formed with slots, the lower ends of the tubes being slidable in the respective side holes and engageable over the respective boss therein;

a dielectric intermediate support part secured to the bar over the bore and formed with

a central throughgoing hole, and

a pair of throughgoing side holes substantially parallel to and flanking the respective central hole;

respective generally parallel upper tubes fixed in the intermediate part and having large-diameter lower ends and small-diameter upper ends formed with slots;

a dielectric upper support part overlying the lower part and formed with

a central throughgoing hole,

a pair of downwardly open side holes substantially parallel to and flanking the respective central hole and of generally the same diameter as the upper tube ends, and

respective upper wire guides forming respective guide passages opening laterally into the respective upper side holes;

an overvoltage protector carried on the intermediate part and having respective input conductors connected to the upper tubes and an output conductor normally in electrical contact with a screw; and

means including a screw engageable through the center holes of all of the parts and into the bore of the bar for pressing the upper part down on the intermediate part, for pressing the intermediate part down on the lower part, and for pressing the tubes into one another and down in the lower part and thereby wedging wires in the passages and aligned with the respective slots into the tubes; and

an overvoltage protector carried on the intermediate part and having respective input conductors connected to the upper tubes and an output conductor normally in electrical contact with the screw.