Abstract:
Discloses a clamp and conductor interconnection apparatus suitable for use in a number of electrical transmission and distribution applications. An interconnection member is disposed on a cable clamp. The interconnection member provides a paired connector mount to mount corresponding lockable articulated cable contact connectors for coupling to conductors that are to be electrically and mechanically interconnected. Each connector mount provides a mechanism to articulate or rotate the cable contact connector with respect to the interconnection member. When the desired orientation of the cable contact connector is achieved, a releasable connector lock means is engaged to releasably fix the orientation of the cable contact connector with respect to the cable clamp.

Description:
FIELD OF THE INVENTION  
         [0001]    This invention relates to apparatus for interconnection of conductors in electrical transmission and distribution facilities and more specifically to conductor interconnection apparatus suited for interconnection of earth grounds to facility conductors, interconnection of overhead cables and cable clamps and cable clips.  
         BACKGROUND TO THE INVENTION  
         [0002]    Electric transmission and distribution facilities frequently require interconnection devices to permit transmission or distribution facility maintenance, for example, the clamping of an earth ground chain cable to a transmission or distribution cable conductor to permit maintenance to be performed on the transmission or distribution facilities. To perform maintenance on transmission or distribution facilities, a ground conductor is typically clamped to one or more of the transmission or distribution conductors to prevent electrical hazard to persons or equipment engaged in performing the maintenance work. Other requirements for clamping or conductor interconnection arise when a transmission or distribution conductor is to be intercoupled with another transmission conductor or to a distribution facility such as a transformer and the like. The clamping or interconnection of transmission conductors to place them in service requires apparatus suitable for use in high voltage and high current applications consonant with electrical distribution facilities.  
           [0003]    In the past, the clamping and interconnection apparatus for these purposes required a plurality of specialized clamp and interconnection apparatus depending on the application or configuration requirements. For example, providing a ground clamp to an overhead conductor to facilitate maintenance and repairs to transmission facilities generally requires utilization of a particular type of clamp adapted for use in that configuration. Similarly, interconnection of conductors to place them in service in a transmission facility such as a transformer sub-station requires other clamp and interconnection apparatus suited for use in that configuration. Because there are a large number of clamp and interconnection apparatus that have been developed over the years to facilitate to interconnection of transmission lines that depend on the facility sought to be interconnected, a transmission or distribution provider is required to maintain a large inventory of parts suitable for use in the particular configuration or application area that may arise. It is therefore desirable to provide apparatus that is suitable for use in a number of configurations or application areas to facilitate reduction in parts inventory and generate cost savings.  
         SUMMARY OF THE INVENTION  
         [0004]    The present invention provides a clamp and interconnection arrangement suitable for use in a number of electrical transmission and distribution applications. In one of its aspects, the invention provides an interconnection member disposed on a cable clamp. The interconnection member provides a paired connector mount to mount corresponding lockable articulated cable contact connectors. Each connector mount provides a mechanism to articulate or orient the cable contact connector with respect to the interconnection member. A releasable connector lock means is engaged to releasably fix the orientation of the cable contact connector with respect to the interconnection member.  
           [0005]    Preferred embodiments of the invention will now be described with reference to the accompanying drawings in which like features of the invention bear like reference numerals throughout the various Figures. 
       
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       [0006]    [0006]FIG. 1 is an elevation view of a preferred embodiment of the conductor interconnection apparatus of the invention, which is shown disposed on a vice clamp type cable clamp.  
         [0007]    [0007]FIG. 2 is an elevation exploded view of the embodiment of the invention of FIG. 1.  
         [0008]    [0008]FIG. 2 a  is an elevation view of an alternate handle of the cable clamp shown in FIG. 2.  
         [0009]    [0009]FIG. 3 a  is a perspective view of a preferred embodiment of a locking articulated cable connector portion of the invention.  
         [0010]    [0010]FIG. 3 b  is a cross-section view of the cable contact connector of FIG. 3 a.    
         [0011]    [0011]FIGS. 4 a ,  4   b  and  4   c  are cross-sectional views of alternative embodiments of the interconnection member of the present invention constructed according to different manners of manufacture.  
         [0012]    [0012]FIG. 5 is an exploded elevation view of a preferred embodiment of the invention disposed on a duck bill clamp type cable clamp.  
         [0013]    [0013]FIG. 6 shows an elevation exploded view of a preferred embodiment of the clamp arrangement of the present invention configured with a jaw clamp type cable clamp. 
     
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS  
       [0014]    [0014]FIG. 1 shows an elevation view of a preferred embodiment of the invention disposed on a vice clamp type of cable clamp, generally depicted by reference number  12 . The embodiment of the invention shown here provides a conductor cable interconnection assembly generally depicted by reference numeral  10 . The conductor cable interconnection assembly is coupled to the cable clamp  12  by a lug  42 . The interconnection member of the cable interconnection assembly is more fully described with reference to FIGS. 4 a ,  4   b  and  4   c . As shown in FIG. 1, the conductor cable interconnection assembly couples to at least one locking articulated cable contact connector, for example, a first ball mount assembly  16  of the cable interconnection assembly is adapted to receive a corresponding locking articulated cable contact connector  14 . Preferably, the interconnection member of the conductor cable interconnection assembly is configured to couple to more than one locking articulated cable contact connector. In the preferred embodiment depicted in FIGS. 1 and 2, the interconnection member of the cable interconnection assembly is configured with two ball stud mount assemblies  16  and  20 . Providing two ball stud mount assemblies allows one or two locking articulated cable contact connectors  14  and  22  to be mounted on the interconnection member providing a cable interconnection assembly capable of interconnecting up to two conductors with the cable clamp  12 . When two locking articulated cable contact connectors are used, the pair of locking articulated cable contact connectors  14  and  22  allows the electrical conductor interconnection apparatus of the present invention to be daisy chained. This daisy chain arrangement is useful, for example, to extend a ground chain conductor to each of the three conductors of a three-phase transmission facility.  
         [0015]    Each locking articulated cable connector  14 ,  22  is provided with a releasable connector mount lock  18  or  24  respectively. The releasable connector mount lock  18  or  24  is configurable between a locked configuration and an unlocked configuration. When the releasable connector mount lock is configured in the locked configuration, the lockable articulated cable contact connector is maintained in a locked position relative to the interconnection member and, consequently the clamp  12 . When the releasable connector mount lock is configured in the unlocked or released configuration, the lockable articulated cable contact connector is permitted to undergo relative rotation in three dimensions with respect to the clamp  12 . Details of the construction of the releasable connector mount lock and lockable articulated contact connector are provided more fully in the disclosure relating to FIGS. 3 a  and  3   b.    
         [0016]    As described, the locking articulated cable connector  14  is angularly displaceable about ball mount assembly  16  in three dimensions. When the locking articulated cable contact connector  14  is oriented in the desired orientation with respect to the wire clamp  12 , a connector mount lock  18  is engaged to lock the locking articulated cable contact connector  14  in fixed relation to the ball mount assembly  16 . The interconnection member of the conductor cable interconnection assembly provides a second ball mount assembly  20 , preferably disposed in generally opposing orientation to the first ball mount assembly  16 . A corresponding second locking articulated cable contact connector  22  is mountable thereon and is lockable in a desired orientation by connector mount lock  24 .  
         [0017]    The second locking articulated cable contact connector  22  is free to rotate in three dimensions with respect to the corresponding ball mount assembly  20  to permit orienting the second locking articulated cable contact connector  22  in a desired relative orientation. When the second locking articulated cable contact connector  22  is positioned as desired, connector mount lock  24  is operated to lock the locking articulated mount fixedly to the ball mount assembly  20 .  
         [0018]    A conduit or conductor  26  has a ferrul  28  crimped at  30  to couple the ferrul  28  to the conductor  26 . Conductor  26  can be a transmission line or a ground conductor as dictated by the needs of the application to which the assembly will be put. The end of ferrul  28  has a connector assembly generally depicted by  32  that interconnects with the locking articulated mount. To facilitate interconnection, the locking articulated mount has a lug  34  to receive a stud  36  extending from ferrul  28 . The opposed end of stud  36  has a threaded circumference to engage nut  38 . In this manner, conductor  26  is mechanically and electrically interconnected with wire clamp  12 . As will be understood, all of the materials coupled to conductor  26  are electrically conductive and dimensioned to carry the currents found in the facilities that they will be used in. While a detailed explanation has been made only in relation to the interconnection of conductor  26  to the wire clamp  12 , as shown in FIG. 1, a duplicate arrangement is used to interconnect conductor  40  to wire clamp  12 . Each of the ball mount assemblies  16  and  20  of the conductor cable interconnection assembly are coupled to clamp lug  42  to complete the electrical interconnection therebetween. A vice clamp type wire clamp  12  is provided with an actuator handle  44  which is rotated to engage or disengage the wire clamp  12  to the conduit to which it will be attached (not shown).  
         [0019]    [0019]FIG. 2 is an exploded elevation view of the clamp of FIG. 1. The locking articulated cable contact connectors  14  and  22  are shown removed from their respective ball mount assemblies  16  and  20  to provide a better understanding of the interoperation and coupling of locking articulated cable contact connectors  14  and  22  with their respective ball mount assemblies  16  and  20 . Preferably, the connector mount locks  18  and  24  are provided with a corresponding eye  46  and  47  to facilitate rotation of the connector mount lock with a linesman&#39;s hot stick tool. A hot stick tool has an insulated rod with a hook disposed at one end adapted to engage the eye or hot stick circle  46 . A linesman manipulates the hot stick to engage or disengage the eye. When the eye is engaged, the hot stick is rotated to effect rotation of the connector mount lock  18  (or  24 ) and effect locking or release of the locking articulated cable contact connector  14  (or  22 ).  
         [0020]    [0020]FIG. 2 a  shows a variation of the handle of the cable clamp  12  shown in FIGS. 1 and 2. In the variation of FIG. 2 a , the cable clamp handle has an eye or hot stick circle  48  in place of the actuator T-handle  44  depicted in FIGS. 1 and 2.  
         [0021]    [0021]FIG. 3 a  shows an elevation view of the inventive locking articulated cable contact connector  14  (or  22 ) and corresponding connector mount lock  18  (or  24 ). FIG. 3 b  is a cross section of the apparatus of FIG. 3 a  and is provided for further exemplification in the discussion that follows. The connector mount lock  18  (or  24 ) has a threaded end  50  which is threadingly received into a threaded bore  52  that extends through the body of the locking articulated cable contact connector  14  (or  22 ). An end of the locking articulated cable contact connector  14  (or  22 ) forms a mating socket  54  which is a spherical cavity dimensioned to receive the ball end of ball mount assembly  16  (or  20 ). The spherical surface of socket cavity  54  surrounds the ball of the ball assembly over which it is mounted. A circular opening  56  is provided at a mid-portion of the locking articulated cable contact connector  14  (or  22 ) to facilitate mounting and dismounting the locking articulated cable contact connector  14  (or  22 ) on a corresponding ball assembly. A slot  58  extends along a side and toward and around to an end of the locking articulated cable contact connector  14  (or  22 ). The slot  58  is dimensioned to slidingly engage the stud portion of the ball stud assembly that it is fitted to but is too small to permit passage therethrough of the ball of the ball stud assembly. Only circular opening  56  is of a dimension sufficiently large enough to permit the ball of a ball stud assembly to pass therethrough. In this manner, the stud portion  60  to which the ball  62  of the ball mount assembly  16  is mounted is able to be rotated with respect to the locking articulated cable contact connector  14  when the connector mount lock  18  is loosened. When the connector mount lock  18  is loosened, the locking articulated cable contact connector is released for rotation and movement with respect to the ball mount assembly  16 .  
         [0022]    While the foregoing discussion relating to FIGS. 3 a  and  3   b  was made principally with reference to cable connector apparatus  14 ,  16  and  18 , it will be understood the foregoing discussion applies equally to the cable connector apparatus  20 ,  22  and  24 .  
         [0023]    [0023]FIGS. 4 a ,  4   b  and  4   c  show alternate embodiments of manufacture of the interconnection member and associated ball mount assemblies  16  and  20  and are provided to illustrate various manners of construction of the interconnection member including the structures for interconnection of the ball mount assemblies to the clamp lug  42 . In the construction depicted in FIG. 4 a , the interconnection member has two ball mount assemblies  16  and  20  that are formed as a one-piece structure integral with clamp lug  42 . Naturally, it is understood that the invention is not restricted to two ball mount assemblies, which is the preferred arrangement for the interconnection member. The interconnection member may be provided with other numbers of ball mount assemblies, for example one ball mount assembly or three ball mount assemblies. In this one piece manner of construction of the interconnection member, the ball mount assemblies  16  and  20  are forged or machined out of the same metal as the clamp and clamp lug  42  from which they are disposed.  
         [0024]    In the alternative interconnection member construction depicted in FIG. 4 b , a threaded end portion  62  is provided respectively on the ball mount assemblies  16  and  20 . The threaded end portion permits threading engagement of the ball mount assemblies of the interconnection member and the clamp lug  42 . Preferably, a shoulder nut  64  is provided to enable a wrench to be applied to the ball assembly of the interconnection member and lockingly secure the respective ball assembly to the clamp lug  42 .  
         [0025]    [0025]FIG. 4 c  shows a third embodiment of the interconnection member, which has a lug constructed where a nut  64  is threadingly engaged to the threaded end portion  62  of the stud  60  of the ball assembly. In this manner of construction of the interconnection member, a shoulder nut  64  is threaded onto the ball assembly which is then fitted or. threaded into a corresponding threaded bore of a clamp lug  42  of the interconnection member. Once the ball stud has been threaded into the clamp lug to the desired position, the shoulder nut  64  is tightened to lock each of the pieces of the interconnection member with respect to the other.  
         [0026]    [0026]FIG. 5 shows a duck bill clamp type of cable clamp  66  that is fitted with the electrical conductor interconnection apparatus of the present invention. As shown in the figure, clamp  66  has ball mount assemblies  16  and  20  disposed from clamp lug  42 . The conductors  26  and  40  are mounted on the corresponding respective ball mount assemblies  16  and  20  to facilitate interconnection of conductors  26  and  40  to the duck bill clamp cable clamp  66 .  
         [0027]    As will be understood from the foregoing, the interconnection apparatus of the present invention may be arranged and can be deployed with multiple types of cable clamps of which, for example, FIG. 5 shows a duck bill clamp type cable clamp.  
         [0028]    [0028]FIG. 6 shows a jaw type cable clamp  68  that is fitted with the interconnection apparatus of the present invention. In the embodiment of FIG. 6, ball mount assemblies  16  and  20  are disposed on clamp lug  42 . Conductors  26  and  40  are mounted to the jaw type cable clamp  68  in the same manner as was described with reference to FIGS. 1 and 2.  
         [0029]    Now that the invention has been described, numerous modifications and substitutions will occur to those skilled in the art. The scope of the invention is not limited to the specific embodiments described herein but is defined by the claims appended hereto.