US 4,902,253 AGranted

Re-terminating inaccessible aluminum conductors

OwnerEzra L. Schachtinventor

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Abstract

A method, installation tool, termination fittings, and test apparatus, for mass-production retrofit of aluminum wiring systems installed in buildings from 1965 to 1973, when aluminum was approved by many inspection departments. The re-termination fittings are customized for mass production on the basis of the sizes (10, 12, etc.) of the existing wire, the required movement of which with this method is minimal, an important factor in view of its frangibility. The battery-operated portable tool solidly swages the fittings to one, two, or more wires. Connection is made to duplex receptacles, the most frequently encountered device, by copper stubs which engage with both screws of the same polarity, assuring that the re-termination fittings are thus firmly fixed to the receptacle, and minimum wire movement will be required. With the re-termination fittings and the method of conductor arrangement, the electrician's work is easier and faster.

Claims4

Dependent claims

An electrical connector for re-terminating at least one previously installed solid aluminum conductor, of the type now outlawed, at a pair of conductor-securing screws, of the same polarity, of a duplex-receptacle, the connector comprising:

a block of electrically high-conductive material, in the general shape of a rectangular parallelopiped, having a front, a back, a top, bottom, and two sides;
stub-like electrical conductors, integral with said block, on centers equivalent to those of said receptacle screws, projecting perpendicularly from said front, said stubs of a length suitable for securing said block to said receptacle, when each of said stubs is engaged with one of said screws;
said parallelopiped having at least one cylindrical bore, from top to bottom of the block, said bore slightly larger than the diameter of said previously-installed conductor, now to be installed therein;
and
said block being positioned within retaining means and indentable from said front and said back, in chisel-tip fashion along a predetermined length of said conductor, said chisel tips in centered alignment with said conductor, into intimate contact with the entire surface of said conductor, and further indenting cylindrical surface of said conductor into a figure-eight like cross-sectional area, said indentations acting as a couple to prevent rotation of said aluminum conductor within said bore of said connector block.

2 more elements

A method of re-terminating, in insulative outlet boxes, existing installed old-technology solid-aluminum wire circuit connections, under the screw heads of existing receptacles, by use of:

(a) connector blocks of electrically high-conductive material, in the general shape of rectangular parallelopipeds, having a front, a back, a top, a bottom, and two sides;
stub-like electrical conductors, integral with said block, on centers equivalent to those of said receptacle screws, projecting perpendicularly from said front, said stubs of a length suitable for securing said block of said receptacle, when each of said stubs is engaged with one of said screws;
said parallelopiped having at least two cylindrical bores, from top to bottom of the block, said bores slightly larger than the diameter of said previously-installed old-technology conductors, now to be installed therein;
and
(b) an apparatus for swaging said electrical terminal connectors of highly-conductive material onto solid aluminum electrical conductors, the device comprising in combination:
impact driving means, and
a pair of coacting jaws having swaging means;
the steps of the method comprising:
moving said receptacle so short a distance out of the outlet box that said wires connected to said receptacles need not be disconnected nor damaged by said movement;
detaching from screws, clipping, stripping straightening, and deoxiding stripped ends of said aluminum circuit wires;
rotating said wire ends only through a slight angle and entering straight ends into said connector bores;
securing said wire ends within said termination blocks by said impact means, working close to front plane of said outlet box;
moving aluminum wires terminated in said blocks through a small angle until perpendicular stubs of said connector blocks are aligned with plane of said receptacle screw-heads;
securing said stubs under said installed screw binding heads;
and
returning said receptacle to its original position within said insulative outlet box.

13 more elements

Dependencies are inferred from the claim text.