Patent Abstract:
Axially compressible, F-connectors for conventional installation tools for interconnection with coaxial cable include grounding inserts for establishing electrical continuity despite inadequate nut tightening. The connector has a rigid nut, a post penetrating the nut, a tubular body, and an end cap. The conductive post coaxially extends through the connector, linking the nut and body. A post end penetrates the coaxial cable. Internal grounding inserts comprise a circular band coaxially engaging the post and portions on the band engaging the nut. Multiple radially spaced apart spring clips defined around the band grasp a flange portion of the post. The band is seated within a ring groove within the nut, making electrical contact. An alternative insert comprises a tubular band for contacting the post and an integral skirt abutting the nut&#39;s internal ring groove and contacting a portion of the socket to which the connector is coupled.

Full Description:
BACKGROUND OF THE INVENTION 
       [0001]    1. Field of the Invention 
         [0002]    The present invention relates generally to coaxial cable connectors. More particularly, the present invention relates to coaxial F-connectors adapted to insure the establishment of a proper ground during installation. Known prior art is classified in United States Patent Class 439, Subclasses 241, 247, 322, 548, 553, 554, 585, and 587. 
         [0003]    2. Description of the Related Art 
         [0004]    Popular cable television systems and satellite television receiving systems depend upon coaxial cable for distributing signals. As is known in the satellite TV arts, coaxial cable in such installations is terminated by F-connectors that threadably establish the necessary signal wiring connections. The F-connector forms a “male” connection portion that fits to a variety of receptacles, forming the “female” portion of the connection. 
         [0005]    F-connectors include a tubular post designed to slide over coaxial cable dielectric material and under the outer conductor at the prepared end of the coaxial cable. The exposed, conductive sheath is usually folded back over the cable jacket. The cable jacket and folded-back outer conductor extend generally around the outside of the tubular post and are typically coaxially received within the tubular connector. A continuity contact between the sheath and the body of the connector is needed. Moreover, contact must be made with the threaded head or nut of the connector that should contact the female socket to which the connection is made. 
         [0006]    F-connectors have numerous advantages over other known fittings, such as RCA, BNC, and PL-259 connectors, in that no soldering is needed for installation, and costs are reduced as parts are minimized. For example, with an F-connector, the center conductor of a properly prepared coaxial cable fitted to it forms the “male” portion of the receptacle connection, and no separate part is needed. A wide variety of F-connectors are known in the art, including the popular compression type connector that aids in rapid assembly and installation. Hundreds of such connectors are seen in U.S. Patent Class 439, particularly Subclass 548. 
         [0007]    However, the extremely high bandwidths and frequencies distributed in conjunction with modern satellite installations necessitates a variety of strict quality control factors. For example, the electrical connection established by the F-connector must not add electrical resistance to the circuit. It must exhibit a proper surge impedance to maintain a wide bandwidth, in the order of several Gigahertz. Numerous physical design requirements exist as well. For example, connectors must maintain a proper seal against the environment, and they must function over long time periods through extreme weather and temperature conditions. Requirements exist governing frictional insertion and disconnection or withdrawal forces as well. 
         [0008]    Importantly, since a variety of coaxial cable diameters exist, it is imperative that satisfactory F-connectors function with differently sized cables, such as RG-6 and RG-59 coaxial cables that are most popular in the satellite television art. 
         [0009]    It is important to establish an effective electrical connection between the F-connector, the internal coaxial cable, and the terminal socket. Proper installation techniques require adequate torquing of the connector head. In other words, it is desired that the installer appropriately tighten the connector during installation. A dependable electrical grounding path must be established through the connector body to the grounded shield or jacket of the coaxial cable. Threaded F-connector nuts should be installed with a wrench to establish reasonable torque settings. Critical tightening of the F nut to the threaded female socket or fixture applies enough pressure to the inner conductor of the coaxial cable to establish proper electrical connections. When fully tightened, the head of the tubular post of the connector directly engages the edge of the outer conductor of the appliance port, thereby making a direct electrical ground connection between the outer conductor of the appliance port and the tubular post; in turn, the tubular post is engaged with the outer conductor of the coaxial cable. 
         [0010]    Many connector installations, however, are not properly completed. It is a simple fact in the satellite and cable television industries that many F-connectors are not appropriately tightened by the installer. The common instillation technique is to torque the F-connector with a small wrench during installation. In some cases installers only partially tighten the F-connector. Some installations are only hand-tightened. As a consequence, proper electrical continuity may not be achieved. Such F-connectors will not be properly “grounded,” and the electrical grounding path can be compromised and can become intermittent. An appropriate low resistance, low loss connection to the female target socket, and the equipment connected to it, will not be established. Unless an alternate ground path exists, poor signal quality, and RFI leakage, will result. This translates to signal loss or degradation to the customer. 
         [0011]    U.S. Pat. No. 3,648,445 issued Jul. 18, 1942 discloses a shield for eliminating electromagnetic interference in an electrical connector. A conductive shielding member having a spring portion snaps into a groove for removably securing the shield. A second spring portion is yieldable to provide electrical contact between the first shell member and a second movable shell member. 
         [0012]    U.S. Pat. No. 3,535,443 issued Sep. 10, 1944 discloses an electromagnetic interference shield for an electrical connector comprising a helically coiled conductive spring interposed between mating halves of the connector. The coiled spring has convolutions slanted at an oblique angle to the center axis of the connector. Mating of the connector members axially flattens the spring to form an almost continuous metal shield between the connector members. 
         [0013]    U.S. Pat. No. 3,439,046 issued Jun. 12, 1943 discloses a coaxial connector with an internal, electrically conductive coil spring is mounted between adjacent portions of connector. As an end member is rotatably threaded toward the housing, an inwardly directed annular bevel engages the spring and moves it inwardly toward an electrically shielded portion of the cable. The spring is compressed circumferentially so that its inner periphery makes electrical grounding contact with the shielded portion of the cable. It is accordingly among the objects of the invention to provide a cable terminating and grounding connector which is simple in construction and which is far simpler in use and installation than similar devices of the type now in use. This simplicity and greater speed of installation of the connector necessarily result in substantial savings in time and labor cost. 
         [0014]    U.S. Pat. No. 5,066,248 issued Nov. 19, 1991 discloses coaxial cable connector comprising a housing sleeve, a connector body, a locking ring, and a center post. A stepped annular collar on the connector body ensures metal-to-metal contact and grounding. 
         [0015]    U.S. Pat. No. 4,106,539 issued Aug. 15, 1948 shows a coaxial connector with a resilient, annular insert between abutting connector pieces for grounding adjacent parts. A band having a cylindrical surface is seated against an internal surface. Folded, resilient fingers connected with the band are biased into contact. The shield has tabs for mounting, and a plurality of folded integral, resilient fingers for establishing a ground. 
         [0016]    U.S. Pat. No. 4,423,919 issued Jan. 3, 1954 discloses a connector with having a cylindrical shell with radial flange, a longitudinal key, and a shielding ring fitted over the shell and adjacent to the flange. The shielding ring comprises a detent having end faces configured to abut connector portions when the detent fits within the keyway, whereby the shell is prevented from rotating. 
         [0017]    U.S. Pat. No. 4,330,166 issued May 18, 1952 discloses an electrical connector substantially shielded against EMP and EMI energy with an internal, conductive spring washer seated in the plug portion of the connector. A wave washer made from beryllium copper alloy is preferred. 
         [0018]    U.S. Pat. No. 6,406,330 issued Jun. 18, 2002 employs an internal, beryllium copper clip ring for grounding. The clip ring forms a ground circuit between a male member and a female member of the electrical connector. The clip ring includes an annular body having an inner wall and an outer wall comprising a plurality of circumferentially spaced slots. 
         [0019]    U.S. Pat. No. 7,114,990 issued Oct. 3, 2006 discloses a coaxial cable connector with an internal grounding clip establishing a grounding path between an internal tubular post and the connector. The grounding clip comprises a C-shaped metal clip with an arcuate curvature that is non-circular. U.S. Pat. No. 7,479,035 issued Jan. 20, 2009 shows a similar F-connector grounding arrangement. 
         [0020]    U.S. Pat. No. 7,753,405 issued Jul. 13, 2010 discloses an RF seal for coaxial connectors that makes a uniform RF seal on a port even with a range of tightening torques. The seal comprises a flexible brim, a transition band, and a tubular insert with an insert chamber defined within the seal. In a first embodiment the flexible brim is angled away from the insert chamber, and in a second embodiment the flexible brim is angled inward toward the insert chamber. A flange end of the seal makes a compliant contact between the port and connector faces when the nut of a connector is partially tightened, and becomes sandwiched firmly between the ground surfaces when the nut is properly tightened. U.S. Pat. No. 7,892,024 issued Feb. 22, 2011 shows a similar grounding insert for F-connectors. 
         [0021]    U.S. Pat. No. 7,524,216 issued Nov. 2, 2010 discloses a coaxial connector comprising a body, a post including a flange having a tapered surface, a nut having an internal lip with a tapered surface, wherein the tapered surface of the nut oppositely corresponds to the tapered surface of the post when is assembled, and a conductive O-ring between the post and the nut for grounding or continuity. Similar U.S. Pat. No. 7,545,946 issued Dec. 7, 2010 and U.S. Pat. No. 7,892,005 issued Feb. 22, 2011 use conductive, internal O-rings for both grounding and sealing. 
         [0022]    U.S. Pat. No. 6,332,815 issued Dec. 25, 2001 and U.S. Pat. No. 6,406,330 issued Jun. 18, 2002 utilize clip rings made of conductive resilient material such as beryllium copper for grounding. The clip ring forms a ground between a male member and a female member of the connector. 
         [0023]    U.S. Pat. No. 6,416,062 issued Apr. 6, 2004 discloses a coaxial cable F connector with an internal coiled spring that establishes continuity. The spring biases the nut toward a rest position wherein not more than three revolutions of the nut into engagement with the shaft are necessary to bring the post of the connector into contact. 
         [0024]    For an adequate design, structural improvements to compressible F-connectors for improving continuity or grounding must function reliably without degrading other important connector requirements. Compressible connectors must adequately compress during installation without excessive force. An environmental seal must be established to keep out water. The coaxial cable inserted into the connector must not be mechanically broken an short circuited during installation. Field installers and technicians must be satisfied with the ease of installation. Finally, the bottom line is that a reliable installation must result for customer satisfaction 
       BRIEF SUMMARY OF THE INVENTION 
       [0025]    Our coaxial cable connectors are of the compressible type. The connectors comprise a rigid nut  24  with a faceted drive head adapted to be torqued during installation of a fitting. The head has an internally threaded, tubular stem, for threadably mating with a typical socket or receptacle. An elongated post coupled to the nut includes a shank, which can be barbed, that engages the prepared end of a coaxial cable. An elongated, tubular body is coupled to the post. When the device is compressed, an end cap is press fitted to the body, coaxially engaging a body shank portion and closing the fitting. 
         [0026]    In known F-connector designs the internal post establishes electrical contact between coaxial cable sheath and metallic parts of the coaxial fitting, such as the nut. Also, the elongated, tubular shank extends from the post to engage the coaxial cable, making contact with the metallic, insulative sheath. 
         [0027]    However, since improper or insufficient tightening of the nut during F-connector installation is so common, and since continuity and/or electrical grounding suffer as a result, our design includes internal grounding inserts that remedy the problem. All embodiments of our grounding insert include means for contacting and grasping the post, and means for contacting the nut, to establish a redundant grounding path between the nut, the post, and the coaxial cable to which the fitting is fastened. 
         [0028]    A preferred grounding insert comprises a circular band, preferably made of beryllium copper alloy. In assembly, the grounding insert band coaxially engages the post. Multiple radially spaced spring clips defined around the band securely grasp a flange portion of the post. The band is seated within a ring groove within the nut, making electrical contact. 
         [0029]    An alternative grounding insert comprises a tubular band for contacting and grasping the post flange. The band is integral with a flared, projecting skirt having a polygonal cross section. The skirt comprises a plurality of vertices and a plurality of facets therebetween. In assembly the band yieldably grasps the periphery of the post flange to establish electrical contact. Skirt vertices abut the nut&#39;s internal ring groove. Electrical contact between the insert, the post, the nut, and the coaxial cable is thus insured, despite insufficient tightening of the nut. 
         [0030]    Thus the primary object of our invention is to provide suitable grounding within an F-connector to overcome electrical connection problems associated with improper installation. 
         [0031]    More particularly, an object of our invention is to provide dependable electrical connections between coaxial connectors, especially F-connectors, and female connectors or sockets. 
         [0032]    Another object of the present invention is to provide internal coaxial cable structure for establishing a grounding path in an improperly-tightened coaxial cable connector. 
         [0033]    A similar object is to provide a proper ground, even though required torque settings have been ignored. 
         [0034]    Another related object of the present invention to provide a reliable ground connection between a connector and a target socket or port, even if the connector is not fully tightened. 
         [0035]    It is another object of the present invention to provide such a coaxial cable connector which establishes and maintains a reliable ground path. 
         [0036]    It is still another object of the present invention to provide such a coaxial connector that can be manufactured economically. 
         [0037]    Another object of our invention is to provide a connector of the character described that establishes satisfactory EMP, EMI, and RFI shielding. 
         [0038]    A related object is to provide a connector of the character described that establishes a decent ground during installation of the male connector to the various types of threaded female connections even though applied torque may fail to meet specifications. 
         [0039]    Another essential object is to establish a proper ground electrical path with a socket even where the male connector is not fully torqued to the proper settings. 
         [0040]    Another important object is to minimize resistive losses in a coaxial cable junction. 
         [0041]    A still further object is to provide a connector suitable for use with demanding large, bandwidth systems approximating three GHz. 
         [0042]    A related object is to provide an F-connector ideally adapted for home satellite systems distributing multiple high definition television channels. 
         [0043]    Another important object is to provide a connector of the character described that is weather proof and moisture resistant. 
         [0044]    Another important object is to provide a compression F-connector of the character described that can be safely and properly installed without deformation of critical parts during final compression. 
         [0045]    These and other objects and advantages of the present invention, along with features of novelty appurtenant thereto, will appear or become apparent in the course of the following descriptive sections. 
       BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS 
       [0046]    In the following drawings, which form a part of the specification and which are to be construed in conjunction therewith, and in which like reference numerals have been employed throughout wherever possible to indicate like parts in the various views: 
         [0047]      FIG. 1  is a frontal isometric view of a typical coaxial connector in which the instant grounding inserts are deployed; 
         [0048]      FIG. 2  is a rear isometric view of the connector of  FIG. 1 ; 
         [0049]      FIG. 3  is an exploded, longitudinal sectional view of the connector of  FIGS. 1 and 2  showing the first embodiment of our grounding insert; 
         [0050]      FIG. 4  is an enlarged, fragmentary assembly view of the connector of  FIGS. 1-3  showing the first embodiment of our grounding insert, with portions thereof broken away or shown in section for clarity; 
         [0051]      FIG. 5  is an enlarged end view of a first embodiment of our grounding insert; 
         [0052]      FIG. 6  is an enlarged, side elevational view of the grounding insert of  FIGS. 3-5 ; 
         [0053]      FIG. 7  is an enlarged, isometric view of the grounding insert of  FIGS. 3-6 ; 
         [0054]      FIG. 8  is an exploded, longitudinal sectional view of a connector such as that of 
         [0055]      FIGS. 1-2 , showing the second embodiment of our grounding insert; 
         [0056]      FIG. 9  is an enlarged, fragmentary assembly view showing the grounding insert of  FIGS. 5-7 , with portions thereof broken away or shown in section for clarity; 
         [0057]      FIG. 10  is an end view of the second embodiment of our grounding insert; 
         [0058]      FIG. 11  is a side elevational view of the second embodiment of our grounding insert; 
         [0059]      FIG. 12  is an isometric view of the second embodiment of out grounding insert of  FIGS. 10 and 11 ; and, 
         [0060]      FIG. 13  is an enlarged sectional view similar to  FIG. 9 , but showing the connector threadably mated to a threaded socket. 
     
    
     DETAILED DESCRIPTION OF THE INVENTION 
       [0061]    Coaxial cable F-connectors are well known in the art. The basic constituents of the coaxial connector of FIGS. 1 and 2 are described in detail, for example, in prior U.S. Pat. No. 7,541,896 entitled “Sealed compression type coaxial cable F-connectors”, issued Nov. 30, 2010, and in prior U.S. Pat. No. 7,513,795, entitled “Compression type coaxial cable F-connectors”, issued Apr. 7, 2009, which are both owned by the same assignee as in the instant case, and which are both hereby incorporated by reference for purposes of disclosure as if fully set forth herein. However, it will be appreciated by those with skill in the art that coaxial cable connectors of other designs may be employed with the grounding inserts described hereinafter. 
         [0062]    Referring initially to  FIGS. 1-4  of the appended drawings, a coaxial F-connector has been generally designated by the reference numeral  20 . As will be recognized by those skilled in the art, connector  20  is a compressible F-connector, that is axially squeezed together longitudinally when secured to a coaxial cable. As is also recognized in the art, connector  20  is adapted to terminate an end of a properly prepared coaxial cable, which is properly inserted through the open bottom end  22  of the connector  20 . Afterwards, the connector is placed within a suitable compression hand tool for compression, assuming the closed configuration of  FIGS. 1 and 2  and making electrical contact with the cable. 
         [0063]    Connector  20  comprises a rigid, tubular, metallic nut  24  with a conventional faceted, preferably hexagonal drive head  26  integral with a protruding, coaxial stem  28 . Nut  24  is torqued during installation. Conventional, internal threads  30  are defined in the stem interior for rotatably, threadably mating with a suitably-threaded socket. The open, tubular front end  21  connects through the open interior to a reduced diameter rear passageway  34  at the back of nut  24 . Circular passageway  34  concentrically borders an annular, non-threaded, internal ring groove  36  that borders an internal shoulder  37  proximate passageway  34 . 
         [0064]    An elongated post  40  rotatably, coaxially passes through the hex headed nut  24 . In most F-connector designs the metallic post  40  establishes electrical contact between the braid of the coax and the metallic nut  24 . The tubular post  40  defines an elongated shank  41  with a coaxial, internal passageway  42  extending between its front  43  and rear  44 . Shank  41  may or may not have barbs formed on it for engaging coaxial cable. A front, annular flange  46  ( FIG. 3 ) is spaced apart from an integral, reduced diameter flange  48 , across a ring groove  50 . A conventional, resilient O-ring  52  is preferably seated within post groove  50  when the connector  20  is assembled. O-ring  52  is preferably made of a silicone elastomer. A barbed, collar  54  having multiple, external barbs  56  is press fitted into the plastic body  60  described below. In assembly it is noted that post flange  46  (i.e.,  FIGS. 3 ,  4 ) axially contacts inner shoulder  37  ( FIG. 4 ) within nut  24 . Inner post flange  48  and the O-ring  52  are coaxially, frictionally disposed within passageway  34  at the rear of nut  24 . 
         [0065]    The rear tapered end  44  of post shank  41  penetrates the prepared end of the coaxial cable, such that the inner, insulated coaxial cable conductor penetrates passageway  42  and enters the front  21  of the nut  24 . Also, the braided shield of the coax is positioned around the exterior of post shank  41 , making electrical contact, and hopefully establishing a good ground, or continuity between the coaxial cable sheath, the post  40 , and the nut  24 . 
         [0066]    An elongated, hollow, tubular body  60 , normally molded from plastic, is coupled to the post  40 . Body  60  preferably comprises a tubular stop ring  62  that is integral with a reduced diameter body shank  64 . The elongated, outer periphery  66  of shank  64  is smooth and cylindrical. The larger diameter stop ring  62  has an annular, rear wall  68  that is coaxial with shank  64 . Ring  62  defines an internal passageway  70  through which the post  40  is inserted. In assembly, the barbed post collar  54  is frictionally seated within body passageway  70 . 
         [0067]    An end cap  76  is pressed unto body  60 , coaxially engaging the body shank  64 . The rigid, preferably metallic end cap  76  smoothly, frictionally, grips body shank  64 , with maximum travel or displacement limited by stop ring  62 . In other words, when the end cap  76  is compressed unto the body  60 , and the connector  20  assumes a closed position (i.e.,  FIG. 2 ), annular wall  63  on the body stop ring  62  will limit deflection or travel of the end cap  76 . Preferably the open end  78  of the end cap includes internally barbed region  79  that couples to the shank  64  of the body  60 . When the body  60  and the cap  76  are compressed together, body travel is limited within cap passageway  82  by contact with internal cap shoulder  85 . The reduced diameter passageway  88  is sized to receive coaxial cable, which is inserted through the flared opening  89 . An outer ring groove  90  at the cap rear can seat a desired O-ring. 
         [0068]    In most F-connectors, grounding or continuity is established by mechanical and electrical contact points between abutting, conductive, metallic parts. Noting  FIGS. 3 and 4 , for example, normal grounding should occur between nut shoulder  37  and post flange  46 . The coaxial cable sheath bearing against the post shank  41  would thus electrically interconnect with the post and the nut  24 , which would in turn establish electrical contact with the socket to which nut  24  is attached. However, grounding or continuity depend on proper tightening of the nut  24 . In the real world, installers often neglect to properly tighten the nut, so less internal, mechanical pressure is available within the F-connector to urge the parts discussed above into abutting, conductive contact. 
         [0069]    Therefore our electrical grounding inserts have been proposed. The first embodiment of our insert is generally designated by the reference numeral  100  ( FIGS. 5-7 .) 
         [0070]    Ground insert  100  comprises an annular, circular band  102  of beryllium copper alloy. Means are provided for contacting and grasping the post flange, and for contacting the nut interior. Insert ends  103  and  104  border one another across a gap  105 . As best viewed in  FIG. 6 , the band midsection  108  is substantially equal in diameter to the opposite, integral spaced apart band edges  109  and  111 . It will be noted that a plurality of radially, spaced apart clips  112  are formed at regular intervals along the circumference of the band  102 . Preferably clips  112  project inwardly towards the center of the band  102 . 
         [0071]    In assembly, the grounding insert  100  coaxially surmounts the post  40 . Specifically, the band  102  coaxially seats upon post flange  46  which is securely grasped at multiple points by the clips  112 . Insert resilience is provided by a combination of the natural “springiness” of the beryllium copper alloy, the gap  105 , and the multiple clips  112  that yieldably grasp the periphery of post flange  46 . Electrical contact between the insert and the post is thus insured by clips  112 . Electric contact between the insert  100  and the nut  24  is insured by the band  102  coaxially seated within annular ring groove  36  ( FIG. 3 ) and the clip end  111  ( FIG. 6 ) that internally abuts nut shoulder  37  (i.e.,  FIGS. 3 ,  4 ). 
         [0072]    The alternative embodiment is seen in  FIGS. 8-12 . Alternative F-connector  23 , is externally identical with connector  20 , discussed above. However. connector  23  includes a modified grounding insert  130  described hereinafter. Like connector  20 , the alternative connector  23  comprises a nut  24 , a post  40 , a body  60  and an end cap  76 , all of which are described above. 
         [0073]    Ground insert  130  comprises means for contacting and grasping the post flange, and for contacting the nut interior. Insert  130  comprises a tubular band  132  of beryllium copper alloy for contacting and grasping the post flange. The cross section of insert  130  is circular. Ends  133  and  134  border one another across a gap  135 . Band  132  is integral with a flared, skirt  138  characterized by a polygonal cross section ( FIG. 10 ). Like a regular polygon, skirt  138  comprises a plurality of vertices  140  and a plurality of facets  142 . The diameter of skirt  138  is maximum, and equal to the diameter of band  132 , between opposed vertices (i.e., between vertices  140  and  140 A in  FIG. 10 ). The gently curved facets  143  establish a smaller internal diameter. For example, the distance between opposite facets  142  and  142 A in  FIG. 10 , corresponding to minimal skirt diameter, is less than the distance between vertices  140  and  140 A. 
         [0074]    Preferably, band  132  is provided with a plurality of radially, spaced apart clips  112 B like clips  112  previously described that are defined around insert  100 . In assembly, clips  112 B make contact with the post flange  46  within the ring groove  36 B. 
         [0075]    In assembly ( FIG. 9 ), the front  145  of grounding insert  130  points exteriorly of the connector  23  towards nut  24 . The insert rear  146  ( FIG. 11 ) points inwardly. Band  132  coaxially seats upon a post flange  46  and yieldably grasps the periphery of the flange to establish electrical contact with the post. In assembly, band  132  occupies space between flange post  46  and internal annular ring groove  36  in nut  24 . Skirt vertices  140  abut the annular ring groove  36 B (i.e.,  FIGS. 8 ,  9 ) in the nut. It is to be noted that ring groove  36 B is longer than similar groove  36  in connector  20 , as the insert  130  is longer than insert  100 . 
         [0076]    Further electrical continuity is established by skirt contact with the socket or terminal to which the connector is coupled. Referencing  FIG. 13 , the connector has engaged a conventional socket  150  that includes the typical external threads  152 . When the connector is attached, the skirt facets, such as facets  142 ,  142 A will externally contact a portion of the socket threads  152 A to help establish continuity between the socket  152  an the connector. 
         [0077]    Insert resilience is provided by a combination of the natural “springiness” of the beryllium copper alloy, the gap  135 , and the multiple facets  142  and vertices  140  of the skirt configuration. Electrical contact between the insert  130  and the post  40  is thus insured. Electric contact between the insert  130  and the nut  24  is also maintained. 
         [0078]    From the foregoing, it will be seen that this invention is one well adapted to obtain all the ends and objects herein set forth, together with other advantages which are inherent to the structure. 
         [0079]    It will be understood that certain features and subcombinations are of utility and may be employed without reference to other features and subcombinations. This is contemplated by and is within the scope of the claims. 
         [0080]    As many possible embodiments may be made of the invention without departing from the scope thereof, it is to be understood that all matter herein set forth or shown in the accompanying drawings is to be interpreted as illustrative and not in a limiting sense.

Technology Classification (CPC): 8