US1084714A - Electrical connection. - Google Patents

Description

Patented J an. 20, 1914.

J. G. STEARNS.

ELECTRICAL CONNECTION.

APPLIOATION FILED MAR. 22, 1013.

JASON C. STEARNS, WORCESTER, MASSACHUSETTS.

ELECTRICAL CONNECTION.

Specification of Letters Patent.

Patented J an. 20,1 914.

Application filed March 22. 1913. Serial No. 756.069.

To all whom it may concern Be it known that I, JASON C. STEARNS, a citizen of the United States, residing at Worcester, in the county of Worcester and State of Massachusetts, have invented a new and useful Electrical Connection, of which the following is a specification This invention relates to an electrical connector suitable for general use, but especially adapted for use in connection with an armored cable for connecting the same with a lamp or the like.

The principal objects of the invention are to provide a simple and compact construction in which the wires of the cable are insulated not only to the end of the connector but for a distance inside the same and in which the wires are fully protected at the end of the connector where they enter it, thisconnection comprising a device cooperating with the armor and also with the connector.

The invention also involves improvements in details of construction and combinations of parts as will appear hereinafter.

Reference is to be had to the accompanying drawings in which Figure 1 is an elevation of a connector constructed in accordance with this invention showing a practical application thereof; Fig. 2 is a similar view partly in section on enlarged scale; Fig. 3 is a similar view of the connector showmg the outside nut in section 5 Fig. 4 is a longitudinal central sectional view of part of the connector on enlarged scale; and Fig. 5 is a transverse sectional view of the same on the line 5-5 of Fig. 1.

The invention is shown as applied to a cable having an outside insulating covering 10 and comprising a pair of wires 11 provided with separate and independent insulation 12. At the point at which the connection is to be made the two wires are broughtout from the end of the insulation of the cable independently of each other and their own insulation 12 is continued for a short distance and the ends are bared. Each of these two so-called wires may consist of a single wire or of a plurality of strands, obviously. The cable is shown as provided with a well 'known type of metallic armor 18. At the end this armor is provided with a solid collar 14.- which is enlarged at the end 15. This end is designed to come over the end of the cable and is provided with an external screw-thread 16 and with a notch 17 extending through said screw-threaded end. The collar 14 may be firmly secured to the metallic armor 13 by solder or by any other suitable fastening means.

The main portion of the connector consists of a member 20 of hard rubber or other insulating material having a general cylindrical form. It is provided with a pair of longitudinal conductors 21 projecting to or beyond one end and extending substantially through the insulation member. These conductors are provided with longitudinal sockets 22 at their opposite end for receiv ing the bared ends of the wires 11, these sockets being countersunk at 23 for a distance for providing an enlarged space for receiving t e insulation 12 of these wires.

The insulating member 20 is of a general cylindrical form but is provided with a cylindrical enlargement 25 at a point near one end having a square shoulder 26. The portion of this member 20 beyond the shoulder is adapted to come inside the enlargement 15 and the shoulder to come up against the square end of said enlargement. At the end of the member 20 is a projecting pin 27 for entering the notch 17 and preventing rotation of the end of the armor with respect to the connector. The wires 11 are held in position in the sockets by means of screws 28, preferably assing in through the enlargement- 25. The parts bein in this position a metallic nut 30 is applied. This nut is provided with an internal screw-thread adapted to fit the screw-thread 16 and with an internal flange 31 at the other end. It is of such design that it passes over the outer end of the connecting member 20 and also over the enlargement 25. Then it screws on the end 15 of the armor so as to bring the square end of the armor firmly againstthe shoulder 26. thus holding these two parts in position. It has the additional effect of thoroughly protecting the wires inside. The armor, it will be observed, overlaps the end of the connection 20 so that it protects the wires where they enter the sockets 23.

The parts so far described constitute the connection but it is shown as provided with a pair of .pins 35 adapted to engage in notches 36 in the lamp connection or other device which is to be applied.

It will be seen that the connection is of exceedingly simple character, suitable ilor general use, easily taken apart for repairs and replacement of parts and is of a neat compact appearance. it also furnishes a strong and durable protection for the wires 'where they need it the most.

Although I have illustrated and described only a simple form of the invention, 1' am aware of the fact that modifications can be made therein by any person skilled in the art without departing from the scope of the invention as expressed in the claims. There'- fore, I do not wish to be limited in these respects but What I do claim is 1. in an electrical connection, the combination with a cable comprising a pair of separately insulated wires, the wires and the insulation thereof both extending from the end oi the cable, armor on said cable, an

' insulating member having a pair of passages therein for receiving said wires and the insulation thereof, whereby the insulation of each wire extends into the body of said insulating member, means on said insulating member for holding the end of the armor against rotation and displacement thereon, and clamping means on the memher "for fixedly securing the armor to the insulating member, said insulating member extending longitudinally through and beyond said clamping means and being provided with connecting devices on its extended portion.

2. in an electrical connection, the combination of a cable having insulationon the outside thereof, a set of wires projecting from the end of said cable and diverging from each other at the end of said insulation, each of said wires having a separate insulating covering thereon and havin bare ends, an armor surrounding said ca le, a circular insulating member having a projection adapted to enter the end or said Witnesses:

neea'zie armor and provided with a pin projecting therefrom, the end of said armor having a slot for receiving said pin and having an external screw thread at the end, the insulating member having an enlarged section near the end which abuts against the end of the armor, and a nut covering said enlarged section and having an internal screwthread at the opposite end for firmly se-- curing the armor to the insulating member.

3. In an electrical connection, the combination of a cable, a set of wires projecting from the end of said cable, an armor surrounding said cable and having an external screw thread thereon, a circular insulating member, the end of which enters the end of said armor and is provided with means forv preventing the rotation of the armor thereon, said insulating member also having an enlarged cylindrical section, the end of which engages the end of the armor, and a nut covering said cylindrical section and having an internal flange for engaging the end thereof and an internal screw-thread at the opposite end fitting the screw thread on the armor.

4. As an article of manufacture, an electrical connector comprising a block of insulating material having conductors extending therethrough and each provided with countersunk sockets in one end, said block having a cylindrical enlargement near the end in which said sockets are located, and a cylindrical nut fitting said enlargement and having an inward flange engaging one end thereof and a screw thread beyond the other end of the enlargement.

In testimony whereof I have hereunto set my hand, in the presence of two subscribing witnesses.

JASUN' C. 'STEARNS.

ALBERT E. FAY, J, ELMER HALL,

Images