CA2728542C

CA2728542C - Duplex electrical connector with frustro-conical retaining ring and crimped inlet end

Info

Publication number: CA2728542C
Application number: CA2728542A
Authority: CA
Inventors: Delbert Auray; Kenneth M. Kiely; Lawrence J. Smith
Original assignee: Bridgeport Fittings LLC
Current assignee: Bridgeport Fittings LLC
Priority date: 2010-02-09
Filing date: 2011-01-20
Publication date: 2019-01-15
Anticipated expiration: 2031-01-20
Also published as: CA2728542A1

Abstract

This disclosure is directed to electrical connectors, and more specifically to various types of electrical connectors, including an connector assembly having an integrally formed connector body having opposed end openings provided with an outer surface that slopes downwardly toward the outlet opening. The inlet opening having lips that are crimped retaining cable retainer inserts. A sloping or frustro-conical, snap fit, outer, retaining ring with locking tangs is provided for snap locking the outlet end portion of the connector body to an associated electric box or panel. The frustro-conical retaining ring has grounding tangs engaging the inner periphery of a knock out hole of an electric box or panel for effecting a positive electrical ground therebetween.

Description

DUPLEX ELECTRICAL CONNECTOR WITH FRUSTRO-CONICAL
RETAINING RING AND CRIMPED INLET END
Field of the Invention This invention is directed to a further advancement in the field of electrical connector assemblies having a snap fit retaining ring circumscribing an outlet end of a connector body for effecting a snap fit connection to an electrical box. More specifically, this invention is directed to further improvements in electrical connector assemblies providing more secure connections and fewer parts.
BACKGROUND OF THE INVENTION
Electrical connectors are commonly used for attaching electrical conductors, cables, wires, electrical metal tubing (EMT) or the like to an electric box, e.g. a junction box, outlet box, switch box, fuse box, or other similar type of electric box or panel. Such known electrical connectors are either of a type that are secured to an electric box by a threaded lock nut or by means of a conventional circular snap fit retaining ring of the type disclosed in US Patents 6,860,758; 6,444,907;
5.169,258; 5,266,050; 5,171,164; 2,744,769 and 1,483,216 for example. Reference is also made to U.S. Patent 6,768,057 which is directed to a right angle type connector formed of a pair of sheet metal stampings fitted together and secured to an electrical box with a snap fit arrangement.
Also known are connectors formed as connector caps which are adapted to be fitted over the end of a conductor, cable or wires, such as disclosed in US Patent 4,880,387. Various other known efforts to facilitate the connection of an electrical conductor to an electric box are evidenced by US Patents 6,043,432; 6,080,933;
6,114,630; 6,133,529; 6,194,661; 6,335,488; 6,352,439;
6,355,884; 6,444,907; 6,555,750; 6,604,400; 6,670,553;
6,737,584; 6,682,355; 6,780,029 and 6,849,803.
Notwithstanding the extensive background relating to electrical connectors, continuing efforts are being made to improve, simplify and/or reduce the cost and/or complexity of the known connectors in an effort to advance the electrical connector art. This disclosure is directed to such efforts.
In particular, difficulties have arisen in holding cable retainers within a connector body. Often the cable retainers are held in by friction or a threaded fastener.
Friction may not provide a sufficient resistance to being separated in all application, and a threaded fastener adds cost and complexity with the assembly of the electrical connector. Therefore, there is a need for a simple, easily manufactured electrical connector that

2 securely retains cable retainers within the connector body.
SUMMARY OF THE INVENTION
The present invention provides a secure electrical connector, preferably a duplex electrical connector, which securely holds cable or wire conductors that have been pushed into the connector body of the electrical connector. Lips formed on the inlet end of the connector body are crimped or in turned to securely hold a sleeve or cylindrical cable retainer within the connector body assuring that the sleeve or cylindrical cable retainer is not unintentionally separated from the connector body.
In accordance with one embodiment of the present invention, there is provided an electrical connector assembly comprising: a connector body formed from a unitary casting having an inlet end portion and an outlet end portion; a sloping surface formed on the outlet end portion; a retaining lug formed on the sloping surface; a frustro-conical outer retainer having a central opening, a retaining slot, and a plurality of locking tangs, wherein the frustro-conical outer retainer is placed on the sloping surface and the retaining slot is placed over the retaining lug holding the frustro-conical outer retainer onto the outlet end portion; a bore formed in the inlet end portion of the connector body; a cable retainer inserted into the bore;
forwardly inclined retaining tangs formed in the cable retainer,

3 whereby a cable or wire conductor pushed in the cable retainer is securely held in place by the forwardly inclined retaining tangs; and an in turned lip formed on the connector body circumscribing greater than 180 degrees and less than 360 degrees of the inlet end portion, whereby the cable retainer is securely held within the bore.
Another embodiment provides a duplex electrical connector assembly which includes a connector body formed from a unitary casting having an inlet end portion and an outlet end portion.
A sloping surface is formed on the outlet end portion. A pair of retaining lugs are formed on the sloping surface. A frustro-conical outer retainer is provided having a central opening, a pair of retaining slots, a plurality of locking tangs, and a plurality of grounding tangs, wherein the frustro-conical outer retainer is placed on the sloping surface and one of the pair of retaining slots is placed over a respective one of the pair of retaining lugs holding the frustro-conical outer retainer onto the outlet end portion. A pair of parallel passageways are formed in the inlet end portion of the connector body, the pair of parallel passageways open to each other over a partition land. A pair of cable retainers are provided each having a linear wall surface portion, one of the pair of cable retainers inserted into a respective one of the pair of parallel passageways, wherein the linear wall surface portion of each of 3a the pair of cable retainers is held adjacent each other. A pair of opposing forwardly inclined retaining tangs are formed in each of the pair of cable retainers, whereby a cable or wire conductor pushed in one of the pair of cable retainers is securely held in place by one of the pair of opposing forwardly inclined retaining tangs. An in turned lip is formed on the connector body circumscribing greater than 180 degrees and less than 360 degrees of each of the inlet end portions of the pair of parallel passageways on the inlet end portion, whereby the pair of cable retainers are securely held within the inlet end portion of the connector body.
A further embodiment of the present invention provides the duplex electrical connector assembly for snap-fitting into an electrical box having a cylindrical opening and retaining two wire conductors. The connector assembly includes a connector body formed from a unitary casting having a duplex inlet end portion and a single outlet end portion, a sloping surface formed on the single outlet end portion. A stop flange is placed between the sloping surface and the connector body. A
pair of opposing retaining lugs are formed on the sloping surface. A frustro-conical outer retainer is provided having a central opening, a pair of retaining slots, a plurality of locking tangs extending cantileverly out of a surface of the frustro-conical outer retainer, and a plurality of cantilever grounding tangs, wherein the frustro-conical outer 3b retainer is placed on the sloping surface and one of the pair of retaining slots is placed over a respective one of the pair of retaining lugs holding the frustro-conical outer retainer onto the outlet end portion. Wherein a distal end of the plurality of grounding tangs extends closer to the stop flange than a distal end of the plurality of locking tangs. A pair of parallel passageways open to each other along a longitudinal length are formed in the inlet end portion of the connector body. A partition land is provided having curved sides and a planar top separating each of the pair of parallel passageways over the longitudinal length. A pair of cable retainers are provided, one of the pair of cable retainers inserted into a respective one of the pair of parallel passageways adjacent the partition land and mating with the curved sides, each of the pair of cable retainers having a linear wall surface positioned adjacent each other. A pair of opposing forwardly inclined retaining tangs are formed in each of the pair of cable retainers, whereby a cable or wire conductor pushed in one of the pair of cable retainers is securely held in place by one of the pair of opposing forwardly inclined retaining tangs. An in turned lip is formed on the connector body circumscribing the pair of parallel passageways on the inlet end portion and extending greater than one hundred and eighty degrees and less than three hundred and sixty degrees around each of the parallel 3c passageways and extending to the partition land, whereby the pair of cable retainers are securely held within the inlet end portion of the connector body.
Yet another embodiment of the present invention provides a duplex electrical connector assembly for snap-fitting into an electrical box having a cylindrical opening and retaining two wire conductors having a connector body formed from a unitary casting having a duplex inlet end portion and a single outlet end portion; a surface formed on the single outlet end portion.
A stop flange is placed between the surface and the connector body. An outer retainer having locking tangs is placed on the surface. A pair of parallel passageways open to each other along a longitudinal length are formed in the inlet end portion of the connector body. A partition land is provided having curved sides and a planar top separating each of the pair of parallel passageways over the longitudinal length. A pair of cable retainers are provided, one of the pair of cable retainers inserted into a respective one of the pair of parallel passageways adjacent the partition land and mating with the curved sides, each of the pair of cable retainers having a linear wall surface positioned adjacent each other. A pair of opposing forwardly inclined retaining tangs are formed in each of the pair of cable retainers, whereby a cable or wire conductor pushed in one of the pair of cable retainers 3d is securely held in place by one of the pair of opposing forwardly inclined retaining tangs. An in turned lip is formed on the connector body circumscribing the pair of parallel passageways on the inlet end portion and extending greater than one hundred and eighty degrees and less than three hundred and sixty degrees around each of the parallel passageways and extending to the partition land, whereby the pair of cable retainers are securely held within the inlet end portion of the connector body.
In one embodiment of the electrical connector, the outlet end portion of the connector body is provided with an outer surface that converges or tapers inwardly toward the outlet opening thereof. Formed on the surface of the opposed end portions are one or more retaining lugs, which may be circumferentially spaced about the end opening and a frustro-conically shaped, snap-fit retainer is fitted onto and secured to the outlet end portion of the connector body. The frustro-conical outer retainer is formed from a blank of sheet material, e.g. spring steel or the like, having a cruciform shape that includes a face portion or simply a central opening wherein the radiating arms of the cruciform blank are disposed about 3e the face portion or central opening to define a frustro-conical shaped cup or ring. The frustro-conical shaped cup or ring so formed is provided with blanked out or die cut tangs to define outwardly bent locking tangs and grounding tangs. The trailing edge and grounding tangs of the frustro-conical ring or cup provides for electrical grounding in the assembled position of the electrical connector to an electric box or panel.
The frustro-conical outer retainer so formed from the frustro-conical ring or cup also has a slot adapted , to receive a retaining lug when the frustro-conical cup or ring is fitted onto the outlet end portion of the connector body whereby the free or trailing edge of the frustro-conical ring or cup define a grounding edge or tang that engages the inner periphery of the knockout hole of an associated electric box or panel for effecting positive electrical continuity or grounding therebetween.
To form the frustro-conical ring or cup, the cruciform arms are arranged to be folded relative to the central opening or face forming portion that circumscribes the central opening, to define a unitary frustro-conically shaped cup-like member or ring to compliment or be fitted onto the outlet end portion of the connector body. The frustro-conical outer retainer thus formed is fitted over or onto the outlet end portion of the connector body so that the retaining slot formed

4 in the frustro-conical outer retainer is adapted to receive the complementary retaining lug formed on the surface of the outlet end portion of the connector body for retaining or securing the frustro-conical outer retainer on the outlet end portion.
With the construction described, the outlet end portion of the electrical connector assembly can be readily inserted through the knockout hole of an electric box wherein the locking tangs will initially be flexed inwardly to pass through the knockout hole of an electric box, and then spring outwardly to lock the electrical connector assembly to the electric box or electric support panel with the trailing or grounding edge or tang of the frustro-conical outer retainer being inherently biased so as to be urged against the internal periphery of the knockout hole due to the frustro-conical configuration and inherent resiliency of the grounding edge or tang to effect a positive electric ground as a result thereof.
Accordingly, it is an object of the present invention to provide an electrical connector having a structure that securely holds a cable or wire conductor.
It is an advantage of the present invention that =
fasteners are not required to hold the cable or wire conductors in place.

It is a feature of the present invention that a crimp or in turned lip is used to securely hold cable retainers within the connector body.
It is another feature of the present invention that a frustro-conical outer retainer is used having a leading edge, a trailing edge and an intermediate portion therebetween and having an integrally formed outwardly sprung locking tang that can be readily connected to a knockout hole of an electric box, panel or enclosure with a snap-fit wherein the trailing edge of the frustro-conical outer retainer functions to enhance the electrical ground between the electrical box and the connector body.
Another object of this invention is to provide for an electrical connector assembly that includes an electrical connector body having an outlet end opening having a frustro-conical outer surface for receiving thereon a complementary frustro-conical outer retainer that is readily fitted to and retained about the outlet end opening of the outlet end portion of the connector body.
Another object of the present invention is to provide an electrical connector assembly that is relatively simple to fabricate, positive in operation, and economical to produce and sell.

These and other objects, advantages, and features will become readily apparent in view of the following more detailed description.
BRIEF DESCRIPTION OF THE DRAWINGS
Fig. 1 is an exploded perspective view of an electrical connector assembly.
Fig. 2 is a plan view of the blank from which the outer retaining ring of the present invention is formed.
Fig. 3 is a detail front view of the outer retainer ring.
Fig. 4 is a detail top plan view of the outer retainer ring of Fig. 3.
Fig. 5 is a detail view of Fig. 4 rotated 900.
Fig. 6 is a sectional view of the outer retainer ring taken along line 6-6 on Fig. 3.
Fig. 7 is a side view of the connector assembly illustrating the alignment thereof relative to the knockout opening of an electric box.
Fig. 8 is a section side view illustrating the connector assembly secured to an electric box, taken along line 8-8 on Fig. 10.
Fig. 9 is a sectional view taken along line 9-9 on Fig. 10 and rotated 90 .

Fig. 10 is a fragmentary front view of the connector assembly secured to an electric box as viewed from the electrical box.
Fig. 11 is an exploded perspective view of a modified form of the invention.
Fig. 12 is a sectional side view of the modified form of the invention of Fig. 11.
Fig. 13 is a top plan view of the blank from which the internal wire conductor retainer is formed.
Fig. 14 is a fragmentary top view of a portion of the blank forming the inner retainer sleeve or ring.
Fig. 15 is an end view of the inner wire conductor retainer ring or sleeve.
Fig. 16 is a top view of the inner retainer ring or sleeve of Fig. 15.
Fig. 17 is a section view taken along 17-17 on Fig.
16.
Fig. 18 is a side view of the inner retainer ring or sleeve.
Fig. 19 is a sectional side view of still another embodiment.
Fig. 20 is a perspective view of a further embodiment of the invention.
Fig. 21 is an exploded perspective view of the embodiment of Fig. 20.

Fig. 22 is a top plan view of the embodiment of Fig.
20 having parts thereof broken away.
Fig. 23 is a sectional view taken along line 23-23 on Fig. 22.
Fig. 24 is the interior plan view of one section of the connector housing of the embodiment illustrated in Fig. 20.
Fig. 25 is an outer end view of Fig. 24.
Fig. 26 is an end view of the connector housing section of Fig. 24.
Fig. 27 is a sectional view of the housing section taken along line 27-27 on Fig. 26.
Fig. 28 is an inside plan view of the complementary housing section of the embodiment illustrated by Fig. 20.
Fig. 29 is an end view of Fig. 28.
Fig. 30 is an inlet end view of Fig. 28.
Fig. 31 is a sectional view taken on line 31-31 on Fig. 30.
Fig. 32 is a sectional view taken on line 32-32 on Fig. 28.
Fig. 33 is an exploded perspective view of still another modification of the invention.
Fig. 34 is a top plan view of the embodiment of Fig.
33.
Fig. 35 is a right end view of Fig. 34.

Fig. 36 is a sectional view taken along line 36-36 on Fig. 35.
Fig. 37 is a perspective of a partially exploded view of another embodiment of the disclosed invention.
Fig. 38 is a perspective view of another modified form of the disclosed invention illustrated without the outer retainer ring.
Fig. 39 is a perspective exploded view of a modified form of the invention.
Fig. 40 is an exploded perspective view of another embodiment of the invention.
Fig. 41 is a partially exploded side view of the .
embodiment of Fig. 40 having parts shown in section.
Fig. 42 is a side sectional view of the embodiment of Fig. 41 showing the connector assembly attached to a knockout hole of an electric box or panel.
Fig. 43 is a fragmentary side view similar to Fig.
42 rotated 90 to illustrate the locking position of the locking tangs relative to an electric box or panel.
Fig. 44 is a detail perspective view illustrating the assembly of hinging the clamping strap to the support saddle.
Fig. 45 is a perspective view of a modified strap type electrical connector.
Fig. 46 is an exploded perspective view of a modified duplex connector embodying the invention.

Fig. 47 is the front or outlet end view of the duplex connector body of Fig. 46.
Fig. 48 is the rear or inlet end view of the duplex connector body of Fig. 46.
Fig. 49 is a top plan view of a duplex connector body of Fig. 46.
Fig. 50 is a sectional side view of the electrical duplex connector assembly of Fig. 46 in the assembled position of the component parts.
Fig. 51 is a sectional view on a reduced scale of the connector body taken along section line 51-51 on Fig.
46.
Fig. 52 is a perspective view of another embodiment of the present invention having a crimped inlet end.
Fig. 53 is an exploded perspective view of the embodiment illustrated in Fig. 52.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
Referring to the drawings, there is shown in Fig. 1 an electrical connector assembly 10. The connector assembly 10 includes a connector body 11, which is usually formed as a metal casting, e.g. zinc or other suitable metallic alloy. The connector body 11 is formed with an inlet end portion 11A and an outlet end portion 11B and having a bore 12 extending therethrough.

Intermediate the connector body 11 or between the inlet end portion 11A and outlet end portion 11B there is provided a radially outwardly extending flange 13 which functions as a stop to limit the amount that the connector body 11 may be inserted through the knockout hole 14 of an electric box or panel 15, as noted in Fig.
8.
As shown in Figs. 1 and 8, the outer surface S of the outlet end portion 11B slopes, tapers or converges toward the outlet opening 16 whereby the outer surface S
of the outlet end portion 11B has a generally frustro-conical configuration. Formed on the surface S of the outlet end portion 11B is an outwardly projecting retainer lug 17. In the illustrated embodiment, two such lugs 17 are shown disposed 180 apart about the outer circumference of the outlet end portion 11B.
The connector assembly 10 also includes a snap fit retaining ring 18. In accordance with this invention, the retaining ring 18 is integrally formed from a blank 19 of spring steel material. As best seen in Fig. 2, the blank 19 is initially formed or stamped to define a generally cruciform shape. The cruciform shape is provided with a face portion 20 having central opening or hole 20A and having four generally radially extending arms defining two pairs of oppositely disposed arms AA
and BE.

As illustrated in Fig. 2, the opposed pair of arms AA are each provided with a retaining slot 21. The opposed pair of arms BB, as best seen in Figs. 2 and 9, are blanked or formed to define a locking tang 22 and to either side thereof the trailing edge of the retaining ring defines an electrical grounding tang 23, 23. As shown, the locking tang 22 is slightly shorter than the adjacent grounding tangs 23, 23. The arrangement is such that the free end of the locking tangs 22 are sprung outwardly and formed so as to engage the inside surface of the electric box 15 in the assembled portion, as best seen in Fig. 9, to secure the connector assembly 10 to the electric box 15 and prohibit any unintentional withdrawal of the connector assembly 10 from the electrical box 15, whereas the free ends or trailing edges of the frustro-conical ring define the grounding tangs 23 that are biased in engagement with the internal periphery of the knockout hole 14. Also, the free edge or end 24A of arms A,A in the assembled position will also function as electrical grounding tangs, as noted in Fig. 8.
In forming the retaining ring 18 from blank 19, the respective arms A,A and B,B are subjected to a series of progressive bending dies which will gradually bend the respective arms about a foldline f, which defines the face or front portion 20, whereby arms A,A and B,B form a cup having circumscribing frustro-conical or outwardly flaring sides to define a frustro conical ring 18 which complements the conical surface S of the leading or outlet end portion 11B, as seen in Fig. 1. In doing so, the locking tangs 22 are cantileverly and outwardly bent or displaced relative to the surface of the frustro-conical ring at a slightly greater outwardly angle or slope than the adjacent grounding edge or tangs 23 and the slope of arms A,A. With the retaining ring 18 so formed, it can be readily fitted onto the outlet end portion 11B whereby the inherent resiliency of the arms A,A will cause the retainer slots 22 to snap fit onto the retaining lug 17 when slots 21 are placed in alignment with lugs 17. The arrangement is such that the retainer ring 18 will be firmly and positively secured to the outlet end portion 11B as seen in Fig. 8. Yet, due to the inherent resiliency of the material of the retaining ring 18, it can be easily detached from the outlet end portion 118 when removal is desired, without destroying the ring 18 by lifting arms A,A free of the retaining lugs 17.
It will be understood that, if desired, the opening 20A may be enlarged to the diameter of the foldline f, in which case the arms A,A and B,B may be gradually bent about the periphery of the enlarged opening, thereby eliminating the face portion 20.

With the retainer ring 18 properly secured to the outlet end 11B of the connector body 11, the connector assembly 10 can be readily secured to an electric box or panel 15 by simply aligning the assembly 10 with a knockout hole 14, as best seen in Fig. 7, and inserting the leading or outlet end portion into the knockout hole 14 until the flange 13 engages the outer side of the electric box or panel 15. In doing so, the tangs 22, 23 and the free ends 24 of arms A,A, respectively, will depress inwardly to permit insertion of the assembly 10.
When the assembly is fully seated in the knockout hole 14, the locking tangs 22 will normally spring outwardly to secure the assembly 10 to the electric box 15, as noted in Fig. 9. The inherent resiliency of the grounding tangs 23, 23 and the free end or edge 24A of arms A,A are normally biased in engagement with the internal periphery of the knockout hole 14 to ensure a positive electrical ground with the electric box 15. The engagement of the free end 24A of arms A,A and grounding tangs 23, 23 against the inner periphery of the knockout hole 14, as noted in Fig. 8, further ensures the firm securing of the retaining slot 21 with the retaining lugs 17, so as to prohibit any disengagement of the outer retaining ring 18 from the connector body 11.
It will be understood that the wire conductor 25 may be secured to the connector assembly 10 either before or after the assembly 10 has been secured to the electric box 15. In the illustrated embodiment, the conductor wire 25 is simply inserted into the inlet end portion 11A
and secured in position by a suitable securing means. In the illustrated embodiment of Fig. 1, the securing means is illustrated as a set screw 26. However, it will be understood that other forms of securing means, including some of the securing wire conductor retaining means disclosed herein, may be used in lieu of a screw.
From the foregoing, it will be apparent that the disclosed connector assembly is quite novel and simple in construction. The snap fit retaining ring 18 can be simply formed from a cruciform shaped blank 19 of spring metal whereby the opposed radially extending arms A,A and B,B can be readily formed into a cup having a generally frustro-conically shaped sidewalls complementing the slope of the outlet end portion 11A, and whereby the outer retainer ring 18 can be readily secured to the connector body simply by the inter-engagement of slots 21 with its complementary lugs 17.
In the assembled position, the outer retainer ring 18 is positively secured to the connector body in a manner to prohibit any unintentional separation. Also the tangs 22 and 23, which are formed integral with ring 18, are shaped and formed so that the locking tangs 22 secure the assembly 10 to an electric box 15 while the grounding tangs 23 ensure a positive electrical ground of the assembly 10 with the associated electric box 15.
Figs. 11 to 19 illustrate various views of a modified form of the invention which are described in application S.N.
11/100,250 filed April 6, 2005, now U.S. Patent 7,064,272, for Snap In Electrical Connector Assembly With Unidirectional Wire Conductor Ring. As illustrated in Fig. 11, the connector assembly 30 includes a connector body 31 which may be formed as a casting form of a suitable metal or alloy, e.g. zinc and the like, as hereinbefore described. The connector body 31 includes a conically shaped outlet end 31A similar to that described with respect to Fig. 1, and a cylindrical inlet end 31B. A
circumscribing internal shoulder 31C is formed intermediate the opposed ends of the connector body 31. As shown in Fig. 12, the internal shoulder 31C defines the demarcation between the bore 32A defining the outlet end 31 and the bore 32B defining the bore of the inlet end. Circumscribing the connector body 31 about the exterior thereof is a radially outwardly extending stop flange 33.
The outlet end 31A of the connector body 30 is provided with opposed retaining lugs 37 adjacent the outlet opening 36.
Circumscribing the sloping or conical surface S of the outlet end 31A is the outer retaining ring 38, similar to that hereinbefore described with respect to Figs. 1 to 10.

In the embodiment illustrated in Fig. 11, the connector assembly 30 includes an internal wire retainer 39 in the form of a ring, cylinder or sleeve which is fitted to the bore 32B of the , connector body 31, and which retainer 39 functions as a unidirectional retainer means arranged to permit a wire conductor to be readily inserted and secured thereinto, and which will resist any applied force imparted to the wire conductor in the opposite direction to prohibit any unintentional separation of the wire conductor from the connector body 31. Wire conductor, as used herein, means any wire, cable, helical wound metal covering or sheath (BX) wire, plastic sheath wire conductor and the like.
Referring to Figs. 13 to 15, the internal retainer 39 is preferably formed from an elongated blank 40 of spring steel.
The retainer blank 40, as best seen in Fig. 13, comprises an elongated generally rectangular blank having a longitudinal leading edge 40A, a trailing edge 40B and opposed end edges 40C
and 40D. End edge 40C is provided with a pair of spaced apart notches 41, 41 and a projecting tongue 42. The other end edge 40D of blank 40 is provided with a pair of projecting tongues 43, 43 arranged to complement notches 41, 41 and a complementary notch 44 for receiving tongue 42 in the formed or rolled position of the retainer sleeve 39, as shown in Fig. 18.
, 18 Blanked, lanced, cut or stamped out of the plane of blank 40 are one or more tangs 45. In one form as shown in Fig. 13, tangs 45 are formed out of the plane of the blank. The respective tangs 45 are bifurcated to define a pair of finger tangs 45A, 45A longitudinally spaced along the longitudinal axis of the blank 40 at a distance, which, when the blank 40 is rolled to form the retainer sleeve 39, the respective pairs of finger tangs 45A are oppositely disposed, as best seen in Fig. 15.
As shown in Figs. 15 and 18, the respective finger tangs 45A, 45A are inwardly bent out of the plane of the retainer sleeve 39. In the illustrated embodiment, the respective finger tangs are provided with a pair of intermediate transverse fold lines F1 and F2 whereby the free end of the respective finger tangs is directed toward the longitudinal axis of the sleeve 39, as shown in Fig. 18.
Referring to Fig. 15, it will be noted that the retainer sleeve is provided with a flattened portion 46 on one side thereof.
The connector body of Figs. 11 and 12 may be formed with an internal complementary flat surface along a portion of the inner circumference thereof. The arrangement is such that the retainer sleeve 39, when inserted into the inlet end 31B of the connector body, is oriented so that the flattened surface 46 of the sleeve 39 complements the internal flattened surface 47 of the connector body. The orientation is such that the opposed finger tangs 45A
are oppositely disposed to firmly grip the wire conductors, e.g.
an armored conductor or other covered conductor.
The outer circumference of the inner retainer sleeve or ring 39 is proportioned so that it can be press fitted or frictionally fitted into the inlet end 31B of the connector body 31 by a force sufficient to firmly secure the inner retainer ring or sleeve 39 within the inlet end so as to prohibit any separation of the retainer ring or sleeve 39 from the inlet end of the connector body. The complementary flattened surfaces 46 of the internal sleeve 39 and 47 of the inlet end of the connector body insures proper orientation of the internal sleeve 39 within the inlet end of the connector body.
Fig. 14 illustrates a fragmentary portion of the blank 40 to show an intermediate step in forming the tang fingers 45A, 45A
so that when the formed blank 40 is rolled to form the internal retaining sleeve, the tang fingers will be disposed in parallel as seen in Figs. 15 and 16. This is attained by fold line F3 which is disposed at an angle, as noted in Fig. 14, so that when the blank is rolled to form the internal retaining sleeve 39, the tang fingers 45A, 45A will be disposed in parallel. The free ends 453 of the respective fingers 45A are angularly offset to engage the grooves of an armored conductor, as noted in Fig. 12 or other covering sheath of a wire conductor that will resist a force attempting to effect separation of the conductor from the connector assembly. The respective free ends 45B may also be laterally offset so that an armored conductor may be threadedly connected to the internal sleeve 39, as well as by simply inserting the armored covered conductor into the retainer sleeve to effect a snap fit connection.
Fig. 19 illustrates a further embodiment. The embodiment of Fig. 19 is directed to a connector assembly 50 which is generally similar to that disclosed in Figs. 1 to 10. The embodiment of Fig. 19 differs from that disclosed in Figs. 1 to and Figs. 11 to 18 in that the connector body 51 is provided with a slotted opening 52 in the inlet end 51A thereof positioned adjacent to the radially outwardly extending flange 53.
Intermediate between the inlet end 51A and the flange 53, the inlet end is provided with a tapped or threaded hole 54 for receiving a set screw 55.
In this form, the wire retainer means comprises an inverted U shape clamp 56 having opposed leg portions 56A, 56B and an interconnected web 56C. The web 56C is provided with an aperture or hole 57 arranged to be disposed in alignment with the tapped or threaded hole 57. The web 560 is sufficiently wide so that one leg, e.g. leg 563, is extended through the slotted opening 52 and the other leg 56A extends over the inlet opening 58 to the inlet end portion 51A. The retaining clamp 56 is adjustably secured to the connector body 51 by the set screw 55 extending through the aligned tapped hole or screw hole 52. By having one leg 568 extending through the slotted opening 52 and the other leg 56A extending over the inlet opening 58, the clamp 56 can be readily adjusted relative to the connector body by turning the set screw 18 in one direction or the other. The arrangement is such that as the set screw 55 is tightened, the opposed and spaced apart free ends of the respective clamp legs 56A, 568 will exert a bearing force on the wire conductor sheath to positively secure a wire conductor to the inlet end of the connector assembly. In all other respects, the connector assembly of Fig.
19 is similar to that disclosed in Figs. 1 to 10, and need not be repeated.
Figs. 20 to 32 are directed to a further modification of the disclosed invention. As best seen in Figs. 20 and 21, the connector assembly 60 includes a housing or connector body 61 having an outlet end 61A and an inlet end 64 connected to the outlet end 61A by a transition section 68, 68A, preferably formed as casting of any suitable metal or allow material, e.g. zinc, aluminum and the like. While the inlet end 64 of the connector body 61 is illustrated as a duplex inlet end, it will be understood that the inlet end may be formed to accommodate more than two separate wire conductors, cables or the like.
A more detailed description of the embodiments disclosed in Figs. 20 to 32 is set forth in application S.N. 11/100,250 filed April 6, 2005 for Snap In Electrical Connector Assembly With Unidirectional Wire Conductor Retaining Ring, now U.S. Patent 7,064,272. Figs. 20 to 32 are directed to a further modification. As best seen in Figs. 20 and 21, the connector assembly 60 includes a housing or connector body formed of a pair of complementary sections or members 61 and 62. The respective complementary sections or members 61 and 62 are preferably formed as casting of any suitable metal or alloy material, e.g. zinc, aluminum and the like.
As best seen in Fig. 21, one of the housing complementary members, e.g. 61, is provided with a projecting leading or outlet end 61A, which is adapted to be inserted through a knockout hole 14 of an electric box or panel 15. The leading or outlet end 61A
is formed with an annular configuration to define an outlet opening 63, through which the conductor leads or wires 80A may extend as noted in Fig. 20. The outer surface S of the leading end 61A slopes or tapers downward toward the central axis of the connector assembly to define a frustro conical outer surface S on the leading end 61A.
The complementary member 61 also includes a trailing or inlet end 64. As shown in Fig. 21, the trailing or inlet end 64 is formed as a pair of semi-cylindrical chambers 64A, 64B
disposed in parallel side by side arrangement separated by an intermediate wall or division 65. The opposed ends of the respective chambers 64A, 64B are defined between an inturned lip 66A circumscribing the inlet opening 66 to the respective chambers 64A, 64B and a transverse web 67. A transition section 68 connects the respective chambers 64A-64B to leading or outlet end 61A.
Extending through the intermediate wall 65 is a tapped hole 68B having internal threads. Also formed on the wall 65 is an aligning depression or recess 69. Circumscribing the leading or outlet end 61A is a radially outwardly extending flange 70 which functions as a stop to limit the distance the connector assembly 60 can be inserted through a knockout opening 14 of an electric box or panel 15.
The complementary housing section or member 62 is formed with a pair of semi-cylindrical chambers 64A', 64B' disposed in parallel relationship and arranged to complement chambers 64A, 64B in the assembled position of the respective housing members 61, 62, as best noted in Figs. 20 and 31. Housing member 62 is provided with a hole 71 extending therethrough which is arranged to be disposed in alignment with the tapped hole 68B whereby the respective housing sections 61, 62 can be secured in the assembled position by a threaded fastening screw 72 inserted through hole 71 and threaded into the tapped hole 68 of the other housing member 61. Housing member 62 is also provided with a transition section 68A that complements transition section 68 of the other housing member or section 61.
To facilitate the alignment of the two housing sections 61 and 62 in assembling the sections 61, 62, there are provided complementary aligning means. In the illustrated embodiment, the aligning means comprises a notch 73 formed at the leading end of the housing member 62 which is arranged to mate with a complementary projection or lug 74 formed on the outlet end portion of the housing member 61. Another alignment means includes a recess or depression 69 formed in the dividing wall 65 of housing member 61 arranged to be disposed in alignment with the projection or dimple 69A formed on the dividing wall 65A of housing member 62.
In this form, the outlet or leading end 61A is provided with retainer lug 75 projecting outwardly from the conical surface S of the outlet end 61A. In the illustrated embodiment, two such retaining lugs 75 are oppositely disposed. Disposed about the outer sloping or tapered surface S of the outlet end 61A is a frustro-conical retainer ring 76. The conical retaining ring 76 is formed and constructed in the manner hereinbefore described with respect to Figs. 2 to 4 and need not be repeated.
As seen in Figs. 20 and 21, the frustro conical external retainer ring 76 can be readily slipped onto the outlet end 61A so that upon engagement of the retainer lugs 75 with the complementary slots 76A formed on the retainer ring 76, the retainer ring 76 is maintained in position on the external surface S of the leading or outlet end 61A as hereinbefore described.
In this form, a wire conductor retainer ring or sleeve 77 is arranged to be disposed and clamped between the complementary chambers defined by the respective housing sections or members 61, 62 when assembled. The respective wire retainer rings or sleeves 77 are similar in construction and function to that described with respect to Figs. 13 to 16, which need not be repeated. It will be noted that dividing wall 65, 65A of the respective housing members 61, 62 are arranged to engage the flat area 77A of the respective wire retainer sleeves 77 thereby functioning as a means for effecting proper orientation of the respective wire retainer sleeves 77 within their respective chambers in the assembled position of the housing sections or members 61, 62.
To assemble the connector 60 of Figs. 20, 21, a formed conductor wire retainer ring 77 as hereinbefore described, is position in each semi-cylindrical chamber defined in one of the housing sections, e.g., as illustrated in Figs. 21 or 22; noting that the flat portion 77A of the respective wire conductor retainer sleeves 77 are positioned against the adjacent opposing surfaces 65B of the dividing wall 65, as best seen in Fig. 23.
In this position, the opposite ends of the respective sleeves 77 abut the interior lip 66A adjacent the inlet opening and the transverse web 67. With the wire retainer rings 77 thus positioned within their respective chamber, the other housing member, e.g. member 62, is fitted to housing member 61 whereby the respective housing sections clamp the respective wire retaining sleeves 77 therebetween as the fastening screw 72 is rotated to secure the two housing sections together as shown in Figs. 20 and 23. It will be noted that the outer diameter (OD) of the wire retainer sleeves 77 are substantially equal to or slightly greater than the internal diameter of the respective chambers in the assembly position of the housing sections 61, 62, as noted in Figs. 20 and 23. The arrangement is such that the respective retainer sleeves 77 are firmly secured within their respective chamber, when assembled, so that the wire retainer sleeves are prohibited from being separated from the connector body or housing. With the housing members 61, 62 thus secured, the external retainer ring 76 can be readily fitted onto the leading end 61A of the connector body or housing, as hereinbefore described.
With the connector body of Fig. 20 thus assembled, it will be noted that the connector assembly 60 can be readily secured to an electric box or panel simply by inserting the leading or outlet end 61A through a knockout hole of a panel or electrical box so as to be readily secured thereto with a snap fit as hereinbefore described. Also with the arrangement described, a wire conductor or cable can be readily attached to the trailing end of the connector assembly 60 with a simple snap fit.
Fig. 20 illustrates a wire conductor having an external helically wound sheath or outer covering 80 which can be readily inserted through the inlet opening of one of the respective chambers formed in the trailing end whereby the gripping tangs 78 formed in the wire retainer sleeves 77, as hereinbefore described, securely grips the armored cable or wire conductors with a snap fit, the arrangement being such that the wire so secured is prohibited from becoming accidentally separated from the connector body, as hereinbefore described. While a conventional armored type conductor 80 is illustrated in Fig. 20, it will be understood that the described connector assembly herein can be suitable for use with other types of wire conductors, e.g. conductors having an external plastic or fabric like sheath.
By simply removing the single fastening 72, the entire assembly can be readily taken apart to effect the separation of the wire conductor if so desired. If desired, the transition portions 68, 68A of the respective housing sections 61, 62 may be provided with peep holes 70 to view the individual conductor wires 80A arranged within the connector body to facilitate an electrical installation.
From the foregoing, it will be noted that the connector assemblies disclosed herein utilize a frustro conically shaped outer retainer ring which is uniquely secured to the leading end of a connector body, with securing tangs and grounding tangs arranged to effect both a positive securement of the connector assembly to a knockout hole of an electric box or panel and a positive electrical ground. In association with an external frustro conical retaining ring, other disclosed embodiments include a trailing end constructed to receive one or more wire conductors and retaining the same to the connector body with a simple snap fit motion. While the embodiment of Fig. 20 has been illustrated and described as having a duplex trailing end portion, it will be understood that the subject matter described can be utilized with one or more chambers formed in the trailing end of the connector body described herein, depending upon the number of wire conductors one may wish to connect to a single connector body.
With respect to the embodiment of Figs. 20 to 32, the arrangement is such that the connector body, being formed of two component housing sections, and secured together with a fastener as described imparts a clamping force onto the spring steel wire retaining ring or sleeve with a surface to surface contact to enhance electrical conductivity or grounding between the component housing sections, and the wire retaining sleeves clamped therebetween.
With the connector body of Fig. 20 illustrated, it will be noted that the connector assembly 60 can be readily secured to an electric box or panel simply by inserting the leading or outlet end 61A through a knockout hole of a panel or electrical box so as to be readily secured thereto with a snap fit as hereinbefore described. With the arrangement described, the respective wire conductors or cables 80 can be readily attached to the trailing or inlet end of the connector assembly 60 with a simple snap fit, as described in the said application S.N. 11/100,250 filed April 6, 2005, now U.S. Patent 7,064,272.
Figs 33 to 36 illustrate a further embodiment of the invention. The connector assembly 300, as illustrated in Figs.
33 and 36, includes a connector body 301 formed as a unitary casting of any suitable metal or alloy, e.g. zinc and the like.

The embodiment of Fig. 33 differs from that of Fig. 20 in that connector body 301 is formed as a unitary casting rather than as separable parts as illustrated in Fig. 20. A more detailed description of the embodiment of the connector assembly of Figs.
33 to 36 is set forth in application S.N. 11/403,099 filed April 12, 2006, for Snap Fit Electrical Connector Assembly With Frustro-Conical Retainer Ring And Internal Unidirectional Snap Fit Wire Conductor Retainer, now U.S. Pate 7,151,223.
Figs. 33 to 36 illustrate a further embodiment. The connector assembly 300, as illustrated in Figs. 33 and 34, includes a connector body 301 formed as a unitary casting of any suitable metal or alloy, e.g. zinc and the like. The form of the casting is somewhat similar to that shown in Fig. 20. The embodiment of Fig. 33 differs from that of Fig. 20 in that connector body 301 is formed as a unitary casting rather than as separable parts as illustrated in Fig. 20.
Referring to Figs. 33 and 34, the connector body 301 includes an outlet end portion 301A, an inlet end portion 301B
defining a pair of inlet chambers 302A, 3023 disposed in side by side relationship with a dividing wall 302 disposed therebetween;
and a transition section 301C for connecting the inlet or trailing end portion 301B to the outlet or leading end portion 301A. While the connector body 301 has been illustrated as having a pair of inlet chambers 302A, 3023, it will be understood that the connector body may be formed to have more than two inlet chambers disposed in side by side relationship.

As previously described, the outer surface S of the outlet end portion slopes or converges downwardly from a circumscribing stop flange 304 toward the outlet opening 305. Circumferentially spaced and projecting outwardly of the sloping surface S are a pair of retaining lugs 306, similar to that hereinbefore described. The arrangement is such that the outer surface S of the outlet end portion 301A may be defined as being frustro-conical in shape.
Circumscribing the outlet end portion is a complementary shaped retaining ring 307. The retaining ring 307 is retained on the outlet end portion 301A in a manner as hereinbefore described with respect to the foregoing embodiments.
Each of the inlet chambers 302A, 302B include a generally cylindrical configuration throughout an arc which is greater than 180 and less than 3600. The non-curvilinear portion of the inlet chambers 302A, 302B, as viewed in Figs. 33, 34, is formed as a flat surface 302C which is integrally connected to the opposed ends of the curvilinear arcuate section by opposed interconnected side walls 303.
In this embodiment of the invention, the respective inlet chambers 302A, 3023 are each provided with a wire conductor retainer 308. The respective wire retainers are formed out of an elongated blank of spring steel or the like which is formed at one end thereof with a reverse bend 308A to define a clip, which is arranged to be fitted onto the flat surface 302C at the inlet opening 309. As best seen in Figs. 33 and 34, the upper leaf of the return bent portion 308A of the wire retainer 308 is provided with a slotted hole 310, which is disposed in alignment with a retaining pin 311 projecting outwardly from the flat surface 302C. To fasten the wire retainer 308 to the inlet end portion, the top of the retaining pin 311 may be swedged or flattened. An alternate means for securing the wire retainer 308 to the exterior flat surface 302C is to proportion the retaining pin 311 relative to the size of the hole 310 to provide a retaining friction fit therebetween.
As best seen in Fig. 36, the other end 313 of the wire retainer 308 is angularly bent relative to the under leaf of the return bend 308A. The free end 313A of the angularly bent end 313 is provided with a concave curvilinear edge to engage the peripheral surface of a wire conductor cover or shealt (not shown). In the illustrated embodiment, the portion 313 of the wire retainer is angularly bent at an approximately 45' angle relative to the under leaf 308C of the return bend 308A. The arrangement of the wire retainer 308 is such that a wire conductor can be simply inserted into an inlet chamber 302A or 302B and pushed past the free end 313A of the angular bent portion 313 whereby the wire conductor is gripped in a manner to prohibit any unintentional withdrawal or separation of the wire conductor from the connector body 301. The construction of the wire retainer 308 is such that it is externally secured to the inlet end portion of the connector body 301 for ease of assembly and whereby the other free end 313A is projected into the inlet chamber in a manner such that a wire conductor can be readily inserted into the associated inlet chamber to be positively gripped thereby so as to prohibit any unintentional withdrawal or separation of the wire conductor from the connector body.
If desired, the transition portion 301C may be provided with one or more peepholes 314 for viewing the individual wire conductors 80A arranged within the conductor body.
Figs. 37, 38 and 39 illustrate further modified embodiments which are disclosed in application Serial No. 11/501,131 filed August 8, 2006, now US patent 7,488,905, for Electrical Connector With Outer Retainer Ring And Unidirectional Conductor Retainer.
As shown in Fig. 37, the electric connector assembly 320 includes a connector body 321 that has an inlet end portion 321A
and a connected outlet end portion 321B. Intermediate between the inlet end portion 321A and the outlet end portion 321B there is provided a radially outwardly extending flange 322 which serves as a stop to limit the portion of the connector assembly 320 that may be inserted through a knock out hole of an electric box, as hereinbefore described.
The inlet end portion 321A defines an inlet opening 323 and the outlet end portion defines an outlet opening 324 that defines the opposed ends of a bore 325 that extends through the connector body between openings 323 and 324.

In this form, the outer surface S of the outlet end portion 321B slopes or tapers downwardly from the stop flange 320 toward the outlet opening 324, as hereinbefore described.
Circumscribing the outer surface S of the outlet end portion 321B
is a frustro-conical external snap fit ring 326 similar to that hereinbefore described. The frustro-conical retainer ring 326 is retained on the sloping surface S of the outlet end portion by the retaining lugs 327 on the outlet end portion engaging the complimentary slots 328 formed in the frustro-conical surface of the outer retaining ring 326 as hereinbefore noted.
In this form, a simplified electrical conductor retainer 332 for securing an armor shielded electric wire, cable or other electrical conductor or wire for securing the same connector body is provided. As shown in Fig. 37, the inlet end portion 321A of the connector body 321 is provided with a window or opening 330 which is disposed in communication with the bore 325 extending through the connector body 321. Projecting outward from the inlet end portion adjacent the inlet opening 323 is a raised fastening mount or boss 331 having a generally flat upper surface 331A.
Supported on mount or boss 331 is a conductor retainer 332.
The conductor retainer 332 is formed of an elongated blank of spring metal, e.g. spring steel or other suitable resilient material, which is angularly bent along an intermediate fold or bend line Li, wherein the angularly bent end 332B is projected through the window or opening 330 so as to extend into the bore 325 for engaging and retaining an electrical conductor. The other end 332A of the conductor retainer is detachably secured to the mount or boss 331 by means of a suitable fastener, e.g. a set screw. The free end 332C may be provided with an arcuate configuration so as to conform with the shape of a wire conductor, that is received within the inlet end portion of the connector body. The portion of the conductor retainer projecting through the window or opening 330 is bent at an angle so that the free end thereof is directed in the direction of the outlet opening 324 of the connector body 321. The arrangement is such that the wire conductor or armored shield conductor can be readily inserted into the inlet opening 323 in a unidirectional manner so that when the conductor is gripped by the free' end 332C of the wire retainer 321, the wire conductor cannot readily be pulled out of the connector body without actively removing the inherent resisting force imparted by the conductor retainer onto the electric conductor.
From the foregoing description, it will be noted that the described electric connector assembly 320 can be readily secured to a knock out hole of an electric box simply by inserting the outlet end with the attached frustro-conical retainer ring through the knock out hole so that upon seating the assembly in the knock out hole causes the locking tangs 334 of ring 326 to spring outwardly and lock the connector assembly to the electric box. Also, the electric conductor can be simply attached to the connector simply by inserting the electric conductor into the inlet end portion wherein it is automatically gripped by the free end 332C in a manner to prohibit any unintentional separation of the electrical conductor from the associated connector assembly.
As will be noted, the wire retainer constitutes a simplified structure which can be readily formed simply from an elongated blank of spring steel or the like, which need only be bent intermediate the length thereof and which is externally mounted on the connector body. The simplified described conductor retainer enhances not only the ease of manufacture and assembly, the simplified structure further minimizes the amount and cost of material otherwise required by the known connectors capable of achieving the ease of use and utility of the invention disclosed in the embodiments described.
Fig. 38 illustrates an embodiment as described with respect to the embodiment of Fig. 37, except that it is applied to a duplex type of an electrical connector assembly 340. As shown, the embodiment of Fig. 38 is directed to an electrical connector assembly having a connector body 341 that includes a trailing or inlet end portion 341A that is shaped so as to define at least two passageways 342, 343, having inlet openings 342A, 343A
disposed in side by side relationship. While only two passages 342, 343 are illustrated, it will he understood that more than two passageways may be disposed in side by side relationship, depending upon the number of wire conductors one wishes to attach to a given connector body.
The connector body 341 also includes an outlet end portion 344 similar to outlet end portion 321B of Fig. 37, and need not be further described. It will be understood that the outlet end 344 is constructed so as to accommodate an outer retainer ring similar to the retainer ring 326 described with respect to Fig.
37, and as hereinbefore described. The embodiment of Fig. 38 includes a transition section 345 that connects the duplex inlet end portion 341A to the outlet end portion 344, and in communication therewith.
The connector body 341 of Fig. 38 also includes a retainer opening or window 342A, 343A disposed in communication with its corresponding passageway 342, 343. Connected to the connector body 341 are conductor retainers 342B, 343B which are similar in structure and function as hereinbefore described with respect to Fig. 38. As shown, the connector retainers 342B, 343B are secured at one end externally of the connector inlet end portion 341A on a mount or boss 346, 347 in the same manner as hereinbefore described. In all other respects, the structure and function of the connector assembly 340 is similar to that described with respect to the embodiment of Fig. 37.
Fig. 39 illustrates a duplex version of the embodiment.
The embodiment of Fig. 39 is directed to an electrical connector assembly 370 that includes a connector body 371 having a duplex inlet end portion 371A, an outlet end portion 371B, and an interconnected transition section 371C interposed between the inlet end portion 371A and outlet end portion 371B. In the illustrated embodiment, the inlet end portion is formed and illustrated as having a pair of side by side passageways 372 and 373 extending through the inlet portion 371A, each passageway 372 and 373 being adapted to receive an electric conductor of the type hereinbefore described. The respective passageways 372, 373 lead to the interior of the transition section 371C wherein the wires of the electric conductor are directed to and out of the inlet end portion 371B, as best noted in Fig. 20. It will be understood that while the embodiment of Fig. 39 has been illustrated and described as a duplex version of Fig. 39, the inlet end portion 371A may be construed to have more than two passageways 372, 373, with or without partition walls, disposed in side by side relationship, depending upon the number of individual wire conductors one desires to connect to a given inlet end portion of a connector body.
The outlet end portion 371B is arranged to receive an outer retainer ring 374.
The embodiment disclosed in Fig. 39 includes an electrical conductor retainer means 375, 376 and an associated window or opening 377, 378 for each passageway 372, 373.
Figs. 40 to 45 are directed to other modified embodiments of the invention. Figs. 40 to 45 are directed to a strap-type electrical connector 300 for securing either nonmetallic cables or armor or metal clad cables thereto, as will be described herein.
As best seen in Figs. 40-44, the illustrated strap type connector 500 includes a connector body 501 having an outlet end 502 terminating in an outlet opening 503. Opposite the outlet opening 503, the connector body 501 is provided with an inlet opening 504. Circumscribing the connector body between the outlet opening 503 and the inlet opening 504 is a radially outwardly extending flange 505 which serves as a stop to limit the distance the outlet end portion of the connector body 501 may be inserted through a knockout hole or opening 506 of an electric box or panel 507. The outer surface "S" of the outlet end 502 slopes or converges inwardly toward the outlet opening 503.
Circumferentially spaced about the outlet end 502 of the connector body 501 are one or more radially outwardly projecting retaining lugs 508. In the illustrated embodiment, two such retaining lugs 508 are provided 180 apart.
Secured to the outlet end 502 of the connector body and circumscribing the outlet end 502 is a frustro-conical snap fit retainer or retainer ring 509, similar to the frustro-conical retainer ring hereinbefore described with respect to Figs. 1 to 5 herein. As best seen in Fig. 40, the frustro-conical, snap-fit, retainer 509 includes a front opening 510 circumscribed by rearwardly and outwardly sloping or bent locking tangs 511. Grounding tangs 513 are provided with retaining slots 514 arranged to receive the retaining lugs 508 when fitted onto the outlet end 502 of the connector body 501, as hereinbefore described.
Connected to the connector body 501 adjacent the inlet opening and forming an integral part of the connector body 501 is a cable support saddle 515 which extends about a circumferential portion of the inlet opening 504, e.g. between approximately 120 to 180 about the inlet opening 504. As shown, the cable support saddle 515 is a curvilinear extension of the inlet opening 504 terminating in laterally outwardly extending ears or lobes 515A and 515B. As best seen in Fig. 40, ear or lobe 515A has a hinge slot 516 formed therein and ear or lobe 515B is provided with an internally threaded hole 517.
Hingedly connected to ear or lobe 515A is a clamping strap 518. As best seen in Fig. 40, the clamping strap 518 is provided with a readily detachable hinge structure 519 which is angularly formed relative to the plane of the strap 518 so as to be received in the hinge slot 517 when connected to the saddle 515. According to this invention, the hinge structure 519 terminates laterally outwardly extending foot portion 520.
In accordance with this invention, the foot portion 520 of the hinge structure 519 is provided with a width "W" which is slightly greater than the width "w" of. the hinge slot 516. The arrangement is such that the clamping strap 518 must be skewed or angled relative to the hinge slot 516 for inserting the foot portion 520 through the hinge slot 516 for connecting the clamping strap 518 to the ear or lobe 515A. When so connected, the clamping strap 518 is free to pivot relative to the saddle 515 between a cable clamping and unclamping position without causing the clamping strap 518 to become detached from the saddle 515. To effect detachment of the clamping strap 518 from the ear or lobe 515A, one must intentionally skew or angle the clamping strap 518 relative to the hinge slot 516 to effect the removal of the clamping strap 518 from the saddle.
The other end of the clamping strap 518 is provided with a strap hole 521 for receiving a fastener, e.g. a screw 522 for securing the clamping strap 518 to the ear or lobe 515B so that the cable is firmly clamped and secured between the saddle 515 and the clamping strap 518.
To insure a positive gripping of the cable between the saddle 515 and the clamping strap 518, an intermediate portion of the clamping strap is provided with a depression 523 that will "bite" or exert a positive frictional force on the cable, when secured in the clamping position (Fig. 42) so as to prohibit the cable of being pulled free or become accidentally detached from the connector body.
As shown, the connector body 501 and connected saddle 515 is preferably formed as a metal casting, e.g.
zinc or other suitable metallic alloy. The strap electric connector as illustrated in Figs. 40 to 44 is preferably used for securing either a non-metallic cable or romex type conductor to an electric box or panel.

By slightly modifying the shape of the clamping strap, the described strap type electric connector may be readily adapted for connecting an armored, or metal clad cable, to an electric box or panel.
Fig. 45 illustrates a modified strap type electrical connector assembly 600 for use in securing an armor or metal clad cable. As shown in Fig. 45, the strap type electrical connector assembly 600 is provided with clamping strap 618 having an intermediate curvilinear portion 618A shaped to compliment the roundness of a metal clad cable, e.g. a BX cable. One end of the armored cable strap is provided with a hinge structure 619, 620 similar to the hinge structure 519, 520 hereinbefore described, whereby the armored cable strap can be hingedly connected to the hinge slot 616 of the associated saddle 615. The other end of the armored cable strap 618 is provided with a hole or opening 621 for receiving a fastening screw similar to that described with respect to Fig. 40. In all other respects, the function and structure of the strap connector 600 is similar to that described with respect to Figs. 40 to 42 and need not be repeated.
From the foregoing description, it will be noted that the armored cable strap 618 can be readily interchanged for the non-metallic cable strap 518 depending upon the type of cable to be secured by the described connector body.
It will be apparent that the principle components described herein, viz, the external frustro-conical retainer rings, the connector bodies and the differently described wire conductor retainers, are rendered readily interchangeable with respect to any of the complementary corresponding components of the various embodiments described herein.
It is to be further noted that the frustro-conical retainer ring, as described herein with respect to the various embodiments disclosed, achieves the further advantage of ensuring positive electrical grounding of the described connector assemblies to an electrical box or panel despite the varying allowable diameter tolerances a knockout hole may have, as permitted by the allowable codes or electrical standards, due to the inherent resiliency and shape that a frustro-conical configuration allows, as described herein.
Referring to Figs. 46 to 51, there is disclosed a further improvement of the invention describe herein.
Fig. 46 illustrates an exploded view of a duplex type connector assembly 650 that includes a connector body 51 having a single outlet end portion 651A and a duplex inlet end portion 651B. As shown, the inlet end portion 65IB includes a pair of parallel passageways or bores 652, 653 that are in communication with the outlet end portion 651A. Between the inlet end portion 651B and the outlet end portion 651A is a transition section 651C, which diverges toward the outlet end opening 354. The respective passageways or bore are separated by a partition wall 655 having opposed vertical surfaces 655A, 655B, as viewed in Figs. 46-48.
As hereinbefore described, the outlet end portion 651A which defines an outlet opening 654 is provided with a tapered outer surface S which converges toward the outlet opening 654. Circumferentially spaced about the outlet opening and extending radially outward relative to the surface S of the outlet end portion 651A are opposed retaining lugs 656. A radially outwardly extending stop flange 657 circumscribes the outlet end portion 651A
adjacent to the transition section 651C, which functions as a stop to limit the amount the connector body may be inserted into a knockout hole of an electric box or panel, as herein previously described. In this form of the invention, the connector body 651 is constructed so that it can be readily formed as a unitary casting from a suitable moldable metal alloy, e.g. zinc, aluminum and the like. Such integrally constructed connector body obviates the prior practice of constructing a connector body of multiple parts which required assembly.

Circumscribing the outer surface S of the outlet end portion 651A is a frustro-conical outer retainer 658 similar to that described with respect to Figs. 1 to 10, and which need not be repeated.
Disposed within each of the respective passageways or bore 652, 653 is a wire or cable unidirectional retainer means. In the illustrated embodiment, the unidirectional retainer means is in the form of a sleeve or cylinder 659, 660 formed preferably from a blank of spring steel as hereinbefore described with respect to Figs. 13 to 18. As described, the respective wire or cable retainers 659, 660 have a generally circular configuration except for a flattened or linear wall surface 65974, 660A, which is arranged to engage the adjacent vertical wall surface 65574, 655B of the partition wall 655 in the inlet end portion 651B when inserted into their associated passageways or bores 652, 653. The arrangement is such that the orientation of the respective wire or cable retainers 656, 660 relative to their respective passageways or bores are predetermined.
As previously described, the respective wire or cable retainers are proportioned and sized so as to be press fitted or frictionally fitted within their corresponding bore or passageway 653, 653 in a manner to withstand any unintentional separation of the cable retainer from its corresponding bore. In all other respects, the construction and function of the internal wire or cable retainer is similar to that hereinbefore described with respect to Figs. 13 and 18.
As noted in Figs. 46 and 50, the connector assembly 650 includes a bushing 661, constructed preferably of a plastic non-conducting material arranged to be inserted in the outlet opening 654 of the connector body 651. The bushing 661 includes a cylindrical body portion 661A
sized and shaped so as to complement the internal surface of the outlet opening 654 with a friction or press fit.
The leading end of the bushing 661 is provided with a radially outwardly extending flange 661B which functions as a stop to limit the insertability of the bushing 661 within the outlet end opening 654.
In the assembled position of the respective component parts, it will be noted that the bushing 661 is inserted and secured within the outlet end opening 654 before the frustro-conical external retainer 650 is secured about the outlet end portion 651B of the connector body. Thus, the engagement of the frustro-conical retainer 650 with the retainer lugs 656 insures that the bushing 661 is prevented from being separated from the outlet opening as it is firmly sandwiched between the outlet opening 654 of the connector body 651 and the frustro-conical retainer 650 secured to the outlet end portion 651B. However, the bushing 661 may also be placed in the outlet end opening 654 after the frustro-conical retainer 650 has been inserted onto the outlet end opening 654.
As the cable retainers 659, 660 are provided with forwardly inclined retaining tangs 662, the respective cable or wire conductors 663 can be readily secured thereto simply by inserting the cable or wire conductor into the respective inlet passageways whereby the retaining tangs permit only unidirectional insertion while resisting an opposing force applied to the cable or wire conductor so as to prohibit any unintentional separation of the cable or wire conductor from the connector body 651.
The simplicity of a duplex connection having a unitary connector body construction provided with an outer frustro-conical retainer for securing the same with a snap fit locking arrangement to an electric box or panel, and the ease by which a wire conductor can be secured to a connector body utilizing the described internal cable retainers enhances the ease of manufacture and assembly of such connectors to result in substantial savings of labor and costs for producing the same, while enhancing the ease of use of such connectors in the field which further aids to minimize the time, effort and labor required to install the same.

Figs. 52 and 53 illustrate another embodiment of the invention disclosed herein. This embodiment provides a more secure connection with fewer parts. This embodiment is directed to a duplex type connector 750 having a connector body 751 with an inlet end portion 7513 and an outlet end portion 751A. A transition section 751C
transitions between the duplex inlet end portion 751B and the single outlet end portion 751A. The single outlet end portion 751A has an outlet end opening 754 in which is placed a plastic bushing 761. The plastic bushing 761 has a cylindrical body portion 761A and a flange 761B. Within the body portion 761A is lanced a tab 761C. The tab 761C
is raised slightly out of the surface of the body portion 761A and provides a friction fit with the outlet end opening 754. Placed over the single outlet end portion 751A on the sloping or conical surface S is a frustro-conical outlet retainer 758. The frustro-conical outlet retainer 758 is held on by two retaining lugs 756 extending through retaining slots 721. The frustro-conical outlet retainer 758 has a central opening 720A.
The frustro-conical outlet retainer 758 also has cut therein locking tangs 722 and grounding tangs 723. The locking tangs 722 spring normally radially outward so as to snap-fit onto an electrical box cylindrical opening, not shown. The grounding tangs 723 help to maintain electrical grounding continuity between the connector and the electrical box. At the duplex inlet end portion 751B
of the connector body 751 are a pair of parallel passageways or bores 752 and 753 in which are placed sleeves or cylindrical cable retainers 759 and 760. The sleeves or cylindrical cable retainers 759 and 760 may be initially friction fit within their respective passageways or bores 752 and 753. Partition land 755 has curved sides that mate with the sleeves or cylindrical cable retainers 759 and 760. When the cylindrical cable retainers 759 and 760 are placed within the bores 752 and 753 flattened or linear wall surfaces 759A and 760A of the respective cylindrical cable retainers 759 and 760 are placed adjacent each other. The adjacent flattened or linear wall surfaces 759A and 760A prevent the cylindrical cable retainers 759 and 760 from rotating and permit them to be positioned at a predetermined angular orientation. The opposing forwardly inclined retaining tangs 762 are positioned to retain a cable or wire conductor, not shown, to be pushed into each of the cylindrical cable retainers 759 and 760 and securely held in place by the inclined retaining tangs 762. Lips 769 and 770 are crimped or turned over once the cylindrical cable retainers 759 and 760 are placed within the bores 752 and 753 securely holding them in place and preventing their unintentional removal. The lips 769 and 770 extend greater than one hundred and eight degrees around the perimeter of the bores 752 and 753 and extend along the curved surface of the partition land 755 to the top planar surface. The lips 769 and 770 end adjacent the top planar surface of the partition land 755 at respective lower lip end 771 and upper lip end 772. Accordingly, the cable retainers 759 and 760 are held in place along their entire curved perimeter or circumference.
While the cylindrical cable retainers 759 and 760 may be adequately held within the passageways or bores 752 and 753 by friction, the crimped or in turned lips 769 and 770 assure that the cylindrical cable retainers 759 and 760 are not inadvertently pulled from the connector body 751. The in turned lips 769 and 770 may be formed by any pressing or metal forming operation after the cylindrical cable retainers 759 and 760 are inserted into their respective passageway 752 or 753. The in turned lips 769 and 770 need only turn in a portion sufficiently to hold the cylindrical cable retainers 759 and 760 within the passageway 752 or 753, and may preferably turn in the thickness of the wall of the cylindrical cable retainers 759 and 760. Additionally, this embodiment reduced the number of assembled parts or additional fasteners needed, helping to reduce cost and labor. Therefore, this embodiment of the invention is an improvement.

While the present invention has been described with respect to several embodiments, it will be understood that various modifications may be made without departing from the spirit or scope of the invention.

Claims

The embodiments of the present invention for which an exclusive property or privilege is claimed are defined as follows:

1. An electrical connector assembly comprising:
a connector body formed from a unitary casting having an inlet end portion and an outlet end portion;
a sloping surface formed on said outlet end portion;
a retaining lug formed on said sloping surface;
a frustro-conical outer retainer having a central opening, a retaining slot, and a plurality of locking tangs, wherein said frustro-conical outer retainer is placed on said sloping surface and the retaining slot is placed over said retaining lug holding said frustro-conical outer retainer onto the outlet end portion;
a bore formed in the inlet end portion of said connector body;
a cable retainer inserted into said bore;
forwardly inclined retaining tangs formed in said cable retainer, whereby a cable or wire conductor pushed in said cable retainer is securely held in place by said forwardly inclined retaining tangs; and an in turned lip formed on said connector body circumscribing greater than 180 degrees and less than 360 degrees of the inlet end portion, whereby said cable retainer is securely held within said bore.

2. The electrical connector assembly as in claim 1 further comprising:
a stop flange adjacent said sloping surface.

3. The electrical connector assembly as in claim 2 wherein:
the plurality of locking tangs are blanked and cantileverely bent out of a surface of said frustro-conical outer retainer wherein free ends of said locking tangs are angularly inclined toward said stop flange.

4. The electrical connector assembly as in claim 1 further comprising:
a plurality of grounding tangs formed on said frustro-conical outer retainer.

5. A duplex electrical connector assembly comprising:
a connector body formed from a unitary casting having an inlet end portion and an outlet end portion;
a sloping surface formed on said outlet end portion;
a pair of retaining lugs formed on said sloping surface;
a frustro-conical outer retainer having a central opening, a pair of retaining slots, a plurality of locking tangs, and a plurality of grounding tangs, wherein said frustro-conical outer retainer is placed on said sloping surface and one of the pair of retaining slots is placed over a respective one of said pair of retaining lugs holding said frustro-conical outer retainer onto the outlet end portion;
a pair of parallel passageways formed in the inlet end portion of said connector body, said pair of parallel passageways open to each other over a partition land;

a pair of cable retainers each having a linear wall surface portion, one of said pair of cable retainers inserted into a respective one of said pair of parallel passageways, wherein the linear wall surface portion of each of said pair of cable retainers is held adjacent each other;
a pair of opposing forwardly inclined retaining tangs formed in each of said pair of cable retainers, whereby a cable or wire conductor pushed in one of said pair of cable retainers is securely held in place by one of said pair of opposing forwardly inclined retaining tangs; and an in turned lip formed on said connector body circumscribing greater than 180 degrees and less than 360 degrees of each of the inlet end portions of the pair of parallel passageways on the inlet end portion, whereby said pair of cable retainers are securely held within the inlet end portion of said connector body.

6. The duplex electrical connector assembly as in claim 5 further comprising:
a stop flange adjacent said sloping surface.

7. The electrical connector assembly as in claim 6 wherein:
the plurality of locking tangs are blanked and cantileverely bent out of a surface of said frustro-conical outer retainer wherein free ends of said locking tangs are angularly inclined toward said stop flange.

8. The duplex electrical connector assembly as in claim 5 wherein:
the partition land has curved sides and a planar surface formed within said body portion and positioned between said pair of parallel passageways.

9. The duplex electrical connector assembly for snap-fitting into an electrical box having a cylindrical opening and retaining two wire conductors comprising:
a connector body formed from a unitary casting having a duplex inlet end portion and a single outlet end portion;
a sloping surface formed on said single outlet end portion;
a stop flange placed between said sloping surface and said connector body;
a pair of opposing retaining lugs formed on said sloping surface;
a frustro-conical outer retainer having a central opening, a pair of retaining slots, a plurality of locking tangs extending cantileverly out of a surface of said frustro-conical outer retainer, and a plurality of cantilever grounding tangs, wherein said frustro-conical outer retainer is placed on said sloping surface and one of the pair of retaining slots is placed over a respective one of said pair of retaining lugs holding said frustro-conical outer retainer onto the outlet end portion, wherein a distal end of the plurality of grounding tangs extends closer to said stop flange than a distal end of the plurality of locking tangs;
a pair of parallel passageways open to each other along a longitudinal length formed in the inlet end portion of said connector body;
a partition land having curved sides and a planar top separating each of said pair of parallel passageways over the longitudinal length;
a pair of cable retainers, one of said pair of cable retainers inserted into a respective one of said pair of parallel passageways adjacent said partition land and mating with the curved sides, each of said pair of cable retainers having a linear wall surface positioned adjacent each other;
a pair of opposing forwardly inclined retaining tangs formed in each of said pair of cable retainers, whereby a cable or wire conductor pushed in one of said pair of cable retainers is securely held in place by one of said pair of opposing forwardly inclined retaining tangs; and an in turned lip formed on said connector body circumscribing the pair of parallel passageways on the inlet end portion and extending greater than one hundred and eighty degrees and less than three hundred and sixty degrees around each of said parallel passageways and extending to said partition land, whereby said pair of cable retainers are securely held within the inlet end portion of said connector body.

10. A duplex electrical connector assembly for snap-fitting into an electrical box having a cylindrical opening and retaining two wire conductors comprising:
a connector body formed from a unitary casting having a duplex inlet end portion and a single outlet end portion;
a surface formed on said single outlet end portion;
a stop flange placed between said surface and said connector body;
an outer retainer having locking tangs placed on said surface;
a pair of parallel passageways open to each other along a longitudinal length formed in the inlet end portion of said connector body;
a partition land having curved sides and a planar top separating each of said pair of parallel passageways over the longitudinal length;
a pair of cable retainers, one of said pair of cable retainers inserted into a respective one of said pair of parallel passageways adjacent said partition land and mating with the curved sides, each of said pair of cable retainers having a linear wall surface positioned adjacent each other;
a pair of opposing forwardly inclined retaining tangs formed in each of said pair of cable retainers, whereby a cable or wire conductor pushed in one of said pair of cable retainers is securely held in place by one of said pair of opposing forwardly inclined retaining tangs; and an in turned lip formed on said connector body circumscribing the pair of parallel passageways on the inlet end portion and extending greater than one hundred and eighty degrees and less than three hundred and sixty degrees around each of said parallel passageways and extending to said partition land, whereby said pair of cable retainers are securely held within the inlet end portion of said connector body.