CA1115799A - Compression connector for primary elbow terminator - Google Patents
Compression connector for primary elbow terminatorInfo
- Publication number
- CA1115799A CA1115799A CA331,793A CA331793A CA1115799A CA 1115799 A CA1115799 A CA 1115799A CA 331793 A CA331793 A CA 331793A CA 1115799 A CA1115799 A CA 1115799A
- Authority
- CA
- Canada
- Prior art keywords
- tubular portion
- compression connector
- shell
- cable
- sleeve
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
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- Connections Effected By Soldering, Adhesion, Or Permanent Deformation (AREA)
Abstract
A. H. Fischer-4 COMPRESSION CONNECTOR FOR PRIMARY ELBOW TERMINATOR
ABSTRACT OF THE DISCLOSURE
A sleeved compression connector assembly for use with pri-mary loadbreak and deadbreak elbow terminator devices. The compression connector is crimped onto the exposed end of a high voltage cable and the crimped connection is inserted into the elbow housing. The connector assembly includes a threaded bore hole, the axis of which extends transversely of the connected cable, for receiving the threaded end of an arc follower .
trode which is inserted into the other end of the elbow housing.
The connector assembly includes a impact extruded rigid copper shell in which the threaded bore is provided at one end thereof and a hollow tubular portion at the other end thereof. An aluminum sleeve is concentrically inserted into the tubular portion. The sleeve is crimped onto the cable by applying a crimping tool to the external surface of the tubular portion of the shell. The rigid shell body provides sufficient bending strength to avoid deformation at the threaded engagement joint with the arc follower electrode and the otherwise resulting poor electrode connection, while the crimped hollow tubular portion and aluminum sleeve therein provide and maintain a secure crimped cable connection.
ABSTRACT OF THE DISCLOSURE
A sleeved compression connector assembly for use with pri-mary loadbreak and deadbreak elbow terminator devices. The compression connector is crimped onto the exposed end of a high voltage cable and the crimped connection is inserted into the elbow housing. The connector assembly includes a threaded bore hole, the axis of which extends transversely of the connected cable, for receiving the threaded end of an arc follower .
trode which is inserted into the other end of the elbow housing.
The connector assembly includes a impact extruded rigid copper shell in which the threaded bore is provided at one end thereof and a hollow tubular portion at the other end thereof. An aluminum sleeve is concentrically inserted into the tubular portion. The sleeve is crimped onto the cable by applying a crimping tool to the external surface of the tubular portion of the shell. The rigid shell body provides sufficient bending strength to avoid deformation at the threaded engagement joint with the arc follower electrode and the otherwise resulting poor electrode connection, while the crimped hollow tubular portion and aluminum sleeve therein provide and maintain a secure crimped cable connection.
Description
11~57~
BACKGROUND OF THE INVENTION:
-This invention relates to a compression connector assemblyfor use with primary elbow terminator devices and, more parti-cularly, to such a connector assembl~ having a rigid lug connector shell and a relatively ductile sleeve therein.
Elbow terminator for primary distribution systems are well known and have been widely used in the art. These devices are used in conjunction with a bushing plug and function to connect and disconnect the cables of the primary circuits under loadbreak and deadbreak circuit conditions. The elbow terminators include a rigid male electrode which extends from one arm of the elbow housing. The electrode is internally terminated with an exposed conductor portion of the cable end which extends into the elbow houcing through the other or transverse arm of the housing. The termination or connection is provided by a soft compression lug connector. The cable is crimped within a cylindrical opening of the lug and the lug includes a threaded bore extending trans-versely of the axis of the cable for receiving the male electrode.
These prior art devices have suffered with the disadvantage that the connection provided by the elbow terminator and associated bushing plug cannot tolerate flexing or movement of the cable relative to the elbow housing. That is, such flexing of the relatively rigid cable results in a bending or deformation of the compression lug connector at the threaded connection to the male electrode. This deformation results in overheating of the elbow connector due to the poor electrical connection at the junction of the deformed lug and the male electrode. This situation is particularly common with compression connector lugs made entirely of aluminum, which is the most popular material for compression connectors as aluminum lends itself to crimping about the exposed 1~157~9 end of the cable. Attempts have been made to avoid this problem by hardening the aluminum material to achieve a greater bending strength. However, since the crimping forces are proportionately increased as the aluminum is hardened, sufficient bending strength cannot be attained without sacrificing the quality of the crimp connection.
In the prior art, this problem has been essentially avoided by the use of unitary bi-metallic compression connectors as exemplified in U. S. Patent No. 3,876,280. These bi-metallic connectors include a generally cylindrical crimping portion made of soft aluminum and wherein the aluminum is bonded by means of inertia welding to a hard copper portion of the compression connector which includes the threaded bore for receiving the male electrode. While these bi-metallic devices have served quite well, it will be appreciated by those skilled in the art that they are difficult and expensive to manufacture. That is, the manufacturing process is particularly difficult to automate and since the respective metallic members are fused together while spinning in a suitable fixture, subsequent hand-operations are often necessary to complete the workpiece.
These and other disadvantages are overcome by the present invention wherein a relatively simple and inexpensive compression connector assembly is provided which facilitates the relative ease of crimping previo~sly enjoved in entirely aluminum com-pression connectors, and which provides sufficient rigidity to avoid the deformation of the connector assembly at its threaded engagement with the male electrode of the elbow terminator.
SU~ARY OF THE INVENTION:
Brieflv, a compression connector assembly for use with a primary elbow connector housing having a first opening for coaxially receiving an exposed end of an insulated high voltage 157~9 cable and a second transverse opening for receiving an arc follower male electrode is provided. The compression connector comprises a generally tubular rigid connector shell having a flatened portion at one end thereof and a hollow tubular portion at the other end thereof. The flatened portion includes a threaded bore hole therein the axis of which extends transversely of the tubular access of the shell for receiving the threaded end of the electrode in threaded engagement therewith. A rela-tively soft sleeve is concentrically mounted within the hollow tubular portion of the shell for receiving and crimping the exposed end of the cable therein.
BRIEF DESCRIPTION OF T~E DRAWING:
The advantages of this invention will become more readily appreciated as the qame becomes completely understood by reference to the following detailed description when taken in conjunction with the accompaning drawing wherein:
Figure 1 is a sectional view of a primary elbow terminator device which incorporates the compression connector assembly of the present invention;
Figure 2 is pictorial view of an installed elbow connector in con~unction with a bushing plug and a connected primary cable;
Figure 3 is a graphic representation of a prior art crimped connector lug which illustrates the deformation problem of the prior art;
Figure 4 is a pictorial cross-sectional view of a bi-metallic connector which has been used in the prior art;
Figures 5a and Sb are side and top views, respectively,of the sleeved compression connector assembly in accordance with the present invention;
- ~1157~9 Figure 6 is a cross-sectional side view of the connector assembly shell;
Figure 7 is a partial sectional side view of the connector shell in conjunction with the crimping sleeve inserted therein;
Figure 8 is a cross-sectional view of the insert sleeve illu~trated in Figure 7; and, Fig~re 9 is a cross-sectional view of an alternate embodi-ment of the compression connector in accordance with the principles of the present invention.
DETAILED DESCRIPTION:
Referring now to Figure 1 there is shown generally at 10 an elbow connector 12 as is well ~nown in the art. Elbow connector 12 includes a central semi-conductive insert portion 14 which recei~es a cable lug 16 therein. Lug 16 is provided with a threaded bore 18 for receiving the threaded end of a male electrode 20. The male electrode 20 is terminated at its end portion with an arc follower member 22 comprising an arc responsive material which generates arc-extinguishing gases in the presence of an electrical arc drawn between the electrodes of the connection, as is well known in the art. Lug 16 receives a stripped end or conductor portion of a cable 24 which includes a grounded sheath 26 an insulated portion 28, and an exposed conductor portion 30.
Figure 2 is a pictorial illustration which graphically illustrates the problem-inducing operation of the prior art elbow terminators. In Figure 2 elbow 12 is shown in its ter-minated or installed position with respect to a bushing plug 32.
It can be seen that as cable 24 is pushed or pulled, it flexes into the moved positions illustrated by the broken lines in Figure 2. Figure 3 is a graphic illustration of the problem , -.
` ` ~1157~9 which arises in the prior art when the terminated elbows experience cable flexing as illustrated in Figure 2. The relative positions of the members illustrated in Figure 3 are somewhat exaggerated in order to promote clarity. It can be seen that as cable 24 is flexed out of its normally transversely extending position relative to the axis of male electrode 20, the body of lug connector 16 tends to follow the curvature of the flexed cable and a pronounced permanent deformation occurs at the threaded bore hole 16a of lug connector 16. This deformation causes in a poor connection due to the resulting relative separation of the conductive surfaces and, therefore, overheating of the termination provided by elbow 24.
Referring now to Figure 4 there is shown a pictorial illus-tration of a bi-metallic lug connector 16' which has been utilized in the prior art to overcome the problem induced by the flexing of elbow terminator cables. Lug connector 16' includes a crimping portion 17 made entirely of aluminum to facilitate easy crimping of portion 17 onto the exposed end of the associated cable.
Threaded bore hole 16a' is provided in a relatively rigid or hard copper portion 19 of the lug connector 16'. The respective members are bonded to one another at the interface thereof by means of~inertia welding as previously described. Again, while such bi-metallic lug connectors do provide increased bending strength, this manufacturing technique is both difficult and expensive.
Referring now to Figures Sa and 5b there are shown side and top views respectively of a sleeved compression connector assembly 116 in accordance with the principles of the present invention.
S7~9 The outline form of compression connector assembly 116 is essen-tially identical to the lug compression connectors of the prior art. However, the compression connector assembly 116 comprises a generally tubular and rigid connector shell member 118 having a hollow tubular portion 120 for receiving a relatively soft com-pression sleeve member concentrically mounted therein, as will be described more fully hereinafter. Shell member 118 includes a threaded bore hole 116a which is provided on_a flatened end portion 121 of member 118 and extends transversely of the axis of assembly 116. The hollow tubular portion 120 of shell member 118 may include chamfered end portions as at 122, and as is conventional. As illustrated in Figure Sb tubular portion 118 provides a generally cylindrical inner chamber 124 for receiving the compression sleeve of the assembly. Shell member 118 may comprise any relatively rigid material such as copper or hardened aluminum. }n this regard, shell member 118 is pre-ferably provided as a unitary member of electrolytic tough pitch ~ETP) copper alloy such as ETP Alloy 110. Further, shell member 118 is preferably made as an impact extrusion or extruded slug wherein an original pellet is placed in a mold cavity and a ra forces the material of the pellet to cold flow into the mold shape.
Referring now to Figure 6 there i5 shown a cross-sectional side view of member 118 and illustrating particularly the wall thickness of the tubular portion 120, and the cylindrical chamber 124 therein. In one constructed ~mbodiment, it was found that a wall thickness t on the order of 0.050 inches provided good results in terms of a crimping force comparable to aluminum while maintainlng a bending strength to resi~t deformation of the threaded bore hole 116a. However, the wall thickness may vary - lllS7~9 in order to meet the needs of a given application. In this regard, it is believed that a wall thickness on the order of 0.040 to 0.100 should also provide good results. Of course, as the wall thickness is increased, the corresponding crimping force required to crimp assembly 116 and the sleeve therein onto the associated exposed end of the primary distribution cable also increases.
Referring now to Figure 7 there is shown a cross-sectional view of shell member 118 of assembly 116 and illustrating in full view of soft aluminum crimping sleeve 130 disposed therein. In this regard, the material of sleeve 130 preferably electrical conductivity (EC) grade pure aluminum such as EC Grade Alloy 1350.
The outside diameter tO.D.~ of crimping sleeve 130 is preferably on the order of 0.002 to 0.003 inches greater than the corres-ponding inside diameter (I.D.) of the tubular portion 118 of assembly 116. This slight oversizing providesan interference fit in order to retain sleeve 130 within assembly 116 prior to its field installation. In this regard, however, it will be appreciated by those skilled in the art that other suitable means o retaining sleeve 130 within assembly 116 can be provided.
For example, the end portion of the hollow tubular po~tion 120 may be staked rolled, or turned inwardly, after sleeve 130 is inserted therein, so as to form a lip to capture and retainingly engage sleeve 130 therein. In any event, it will be appreciated ~y those skilled in the art that the sleeve diameter may also be less than the inside diameter of the shell cavity.
In Figure 8 there is shown a cross-sectional view of sleeve 130 in accordance with the present invention. In currentlv preferred practice, the outside diameter of sleeve 130 for all cable wire sizes is constant and the inside diameter (I.D.) is , , , ~ .
11~57~
g varied to meet differing cable conductor or wire size require-ments. That is, for a smaller diameter cable conductor, dimension d is correspondingly decreased and each differently sized sleeve 130 is interchangeably with the fixed dimension cavity 124 of shell member 11~. In this manner, the same shell member can be used with any one of the different conductor size sleeves.
Additionally, in currently preferred practice, all surfaces of both shell member 120 and sleeve 13~ are provided with a coating or plating of a suitable material on the order of 0.0002 to 0.004 inches. This plating provides a means for avoiding corrosion that might otherwise take place between the interfaces of a dissimilar material~ of the assembly, as in ~nown in the art.
Further, once the respective members of assembly 116 are formed, they are annealed to remove any residual work hardening intro-duced therein, thereby to facilitate the subsequent cable crimping.
It has been found that notwithstanding the annealing operation, the copper material of shell member 120 retains its relative rigidity particularly with respect to the soft aluminum sleeve.
Moreover, the preferred wall thickness t provides the required rigidity for bending strength to avoid deformation without adversely impacting the crimping forces required to crimp a conductor disposed within the inserted sleeve member 130. Thus, the apparent tradeoff occasioned by the annealing operation nevertheless provides a bending strength comparable to the difficult and expensive to manufacture bi-metallic lug connectors; and, it has been found that the crimping forces are comparable to aluminum alone and are generally no greater than hardened aluminum.
~ eferrin~ now to Figure 9, there is shown a cross-sectional view of an alternate embodiment of the compression connector in accordance with the principles of the pre~ent invention.
_ g _ . . . - .
:. : --. : .
::,. : : .
~1~57~9 Compression connector 116' is similar to connector 16 of the previous drawing figures and like elements bear li]ce reference numerals. Connector 116' includes a turned or rolled over por-tion 122' which functions to capture and retainingly engage sleeve 130 as previously described.
What has been taught, then, is a compression connector assembly for use with elbow terminator devices and facilitating, notably, a rigid structural configuration which avoids deforma-tion of the threaded portion of the shell member of the connector assembly without significantly impacting the required crimping forces. The form of the invention illustrated and described herein is but a preferred embodiment of these teachings in the form currently preferred for manufacture. It is shown as a illustration of the inventive concepts, however, rather than by way of limitation, and it is pointed out that various modi-fications and alterations may be indulged in within the scope of the appended claims.
:, ~ .,,
BACKGROUND OF THE INVENTION:
-This invention relates to a compression connector assemblyfor use with primary elbow terminator devices and, more parti-cularly, to such a connector assembl~ having a rigid lug connector shell and a relatively ductile sleeve therein.
Elbow terminator for primary distribution systems are well known and have been widely used in the art. These devices are used in conjunction with a bushing plug and function to connect and disconnect the cables of the primary circuits under loadbreak and deadbreak circuit conditions. The elbow terminators include a rigid male electrode which extends from one arm of the elbow housing. The electrode is internally terminated with an exposed conductor portion of the cable end which extends into the elbow houcing through the other or transverse arm of the housing. The termination or connection is provided by a soft compression lug connector. The cable is crimped within a cylindrical opening of the lug and the lug includes a threaded bore extending trans-versely of the axis of the cable for receiving the male electrode.
These prior art devices have suffered with the disadvantage that the connection provided by the elbow terminator and associated bushing plug cannot tolerate flexing or movement of the cable relative to the elbow housing. That is, such flexing of the relatively rigid cable results in a bending or deformation of the compression lug connector at the threaded connection to the male electrode. This deformation results in overheating of the elbow connector due to the poor electrical connection at the junction of the deformed lug and the male electrode. This situation is particularly common with compression connector lugs made entirely of aluminum, which is the most popular material for compression connectors as aluminum lends itself to crimping about the exposed 1~157~9 end of the cable. Attempts have been made to avoid this problem by hardening the aluminum material to achieve a greater bending strength. However, since the crimping forces are proportionately increased as the aluminum is hardened, sufficient bending strength cannot be attained without sacrificing the quality of the crimp connection.
In the prior art, this problem has been essentially avoided by the use of unitary bi-metallic compression connectors as exemplified in U. S. Patent No. 3,876,280. These bi-metallic connectors include a generally cylindrical crimping portion made of soft aluminum and wherein the aluminum is bonded by means of inertia welding to a hard copper portion of the compression connector which includes the threaded bore for receiving the male electrode. While these bi-metallic devices have served quite well, it will be appreciated by those skilled in the art that they are difficult and expensive to manufacture. That is, the manufacturing process is particularly difficult to automate and since the respective metallic members are fused together while spinning in a suitable fixture, subsequent hand-operations are often necessary to complete the workpiece.
These and other disadvantages are overcome by the present invention wherein a relatively simple and inexpensive compression connector assembly is provided which facilitates the relative ease of crimping previo~sly enjoved in entirely aluminum com-pression connectors, and which provides sufficient rigidity to avoid the deformation of the connector assembly at its threaded engagement with the male electrode of the elbow terminator.
SU~ARY OF THE INVENTION:
Brieflv, a compression connector assembly for use with a primary elbow connector housing having a first opening for coaxially receiving an exposed end of an insulated high voltage 157~9 cable and a second transverse opening for receiving an arc follower male electrode is provided. The compression connector comprises a generally tubular rigid connector shell having a flatened portion at one end thereof and a hollow tubular portion at the other end thereof. The flatened portion includes a threaded bore hole therein the axis of which extends transversely of the tubular access of the shell for receiving the threaded end of the electrode in threaded engagement therewith. A rela-tively soft sleeve is concentrically mounted within the hollow tubular portion of the shell for receiving and crimping the exposed end of the cable therein.
BRIEF DESCRIPTION OF T~E DRAWING:
The advantages of this invention will become more readily appreciated as the qame becomes completely understood by reference to the following detailed description when taken in conjunction with the accompaning drawing wherein:
Figure 1 is a sectional view of a primary elbow terminator device which incorporates the compression connector assembly of the present invention;
Figure 2 is pictorial view of an installed elbow connector in con~unction with a bushing plug and a connected primary cable;
Figure 3 is a graphic representation of a prior art crimped connector lug which illustrates the deformation problem of the prior art;
Figure 4 is a pictorial cross-sectional view of a bi-metallic connector which has been used in the prior art;
Figures 5a and Sb are side and top views, respectively,of the sleeved compression connector assembly in accordance with the present invention;
- ~1157~9 Figure 6 is a cross-sectional side view of the connector assembly shell;
Figure 7 is a partial sectional side view of the connector shell in conjunction with the crimping sleeve inserted therein;
Figure 8 is a cross-sectional view of the insert sleeve illu~trated in Figure 7; and, Fig~re 9 is a cross-sectional view of an alternate embodi-ment of the compression connector in accordance with the principles of the present invention.
DETAILED DESCRIPTION:
Referring now to Figure 1 there is shown generally at 10 an elbow connector 12 as is well ~nown in the art. Elbow connector 12 includes a central semi-conductive insert portion 14 which recei~es a cable lug 16 therein. Lug 16 is provided with a threaded bore 18 for receiving the threaded end of a male electrode 20. The male electrode 20 is terminated at its end portion with an arc follower member 22 comprising an arc responsive material which generates arc-extinguishing gases in the presence of an electrical arc drawn between the electrodes of the connection, as is well known in the art. Lug 16 receives a stripped end or conductor portion of a cable 24 which includes a grounded sheath 26 an insulated portion 28, and an exposed conductor portion 30.
Figure 2 is a pictorial illustration which graphically illustrates the problem-inducing operation of the prior art elbow terminators. In Figure 2 elbow 12 is shown in its ter-minated or installed position with respect to a bushing plug 32.
It can be seen that as cable 24 is pushed or pulled, it flexes into the moved positions illustrated by the broken lines in Figure 2. Figure 3 is a graphic illustration of the problem , -.
` ` ~1157~9 which arises in the prior art when the terminated elbows experience cable flexing as illustrated in Figure 2. The relative positions of the members illustrated in Figure 3 are somewhat exaggerated in order to promote clarity. It can be seen that as cable 24 is flexed out of its normally transversely extending position relative to the axis of male electrode 20, the body of lug connector 16 tends to follow the curvature of the flexed cable and a pronounced permanent deformation occurs at the threaded bore hole 16a of lug connector 16. This deformation causes in a poor connection due to the resulting relative separation of the conductive surfaces and, therefore, overheating of the termination provided by elbow 24.
Referring now to Figure 4 there is shown a pictorial illus-tration of a bi-metallic lug connector 16' which has been utilized in the prior art to overcome the problem induced by the flexing of elbow terminator cables. Lug connector 16' includes a crimping portion 17 made entirely of aluminum to facilitate easy crimping of portion 17 onto the exposed end of the associated cable.
Threaded bore hole 16a' is provided in a relatively rigid or hard copper portion 19 of the lug connector 16'. The respective members are bonded to one another at the interface thereof by means of~inertia welding as previously described. Again, while such bi-metallic lug connectors do provide increased bending strength, this manufacturing technique is both difficult and expensive.
Referring now to Figures Sa and 5b there are shown side and top views respectively of a sleeved compression connector assembly 116 in accordance with the principles of the present invention.
S7~9 The outline form of compression connector assembly 116 is essen-tially identical to the lug compression connectors of the prior art. However, the compression connector assembly 116 comprises a generally tubular and rigid connector shell member 118 having a hollow tubular portion 120 for receiving a relatively soft com-pression sleeve member concentrically mounted therein, as will be described more fully hereinafter. Shell member 118 includes a threaded bore hole 116a which is provided on_a flatened end portion 121 of member 118 and extends transversely of the axis of assembly 116. The hollow tubular portion 120 of shell member 118 may include chamfered end portions as at 122, and as is conventional. As illustrated in Figure Sb tubular portion 118 provides a generally cylindrical inner chamber 124 for receiving the compression sleeve of the assembly. Shell member 118 may comprise any relatively rigid material such as copper or hardened aluminum. }n this regard, shell member 118 is pre-ferably provided as a unitary member of electrolytic tough pitch ~ETP) copper alloy such as ETP Alloy 110. Further, shell member 118 is preferably made as an impact extrusion or extruded slug wherein an original pellet is placed in a mold cavity and a ra forces the material of the pellet to cold flow into the mold shape.
Referring now to Figure 6 there i5 shown a cross-sectional side view of member 118 and illustrating particularly the wall thickness of the tubular portion 120, and the cylindrical chamber 124 therein. In one constructed ~mbodiment, it was found that a wall thickness t on the order of 0.050 inches provided good results in terms of a crimping force comparable to aluminum while maintainlng a bending strength to resi~t deformation of the threaded bore hole 116a. However, the wall thickness may vary - lllS7~9 in order to meet the needs of a given application. In this regard, it is believed that a wall thickness on the order of 0.040 to 0.100 should also provide good results. Of course, as the wall thickness is increased, the corresponding crimping force required to crimp assembly 116 and the sleeve therein onto the associated exposed end of the primary distribution cable also increases.
Referring now to Figure 7 there is shown a cross-sectional view of shell member 118 of assembly 116 and illustrating in full view of soft aluminum crimping sleeve 130 disposed therein. In this regard, the material of sleeve 130 preferably electrical conductivity (EC) grade pure aluminum such as EC Grade Alloy 1350.
The outside diameter tO.D.~ of crimping sleeve 130 is preferably on the order of 0.002 to 0.003 inches greater than the corres-ponding inside diameter (I.D.) of the tubular portion 118 of assembly 116. This slight oversizing providesan interference fit in order to retain sleeve 130 within assembly 116 prior to its field installation. In this regard, however, it will be appreciated by those skilled in the art that other suitable means o retaining sleeve 130 within assembly 116 can be provided.
For example, the end portion of the hollow tubular po~tion 120 may be staked rolled, or turned inwardly, after sleeve 130 is inserted therein, so as to form a lip to capture and retainingly engage sleeve 130 therein. In any event, it will be appreciated ~y those skilled in the art that the sleeve diameter may also be less than the inside diameter of the shell cavity.
In Figure 8 there is shown a cross-sectional view of sleeve 130 in accordance with the present invention. In currentlv preferred practice, the outside diameter of sleeve 130 for all cable wire sizes is constant and the inside diameter (I.D.) is , , , ~ .
11~57~
g varied to meet differing cable conductor or wire size require-ments. That is, for a smaller diameter cable conductor, dimension d is correspondingly decreased and each differently sized sleeve 130 is interchangeably with the fixed dimension cavity 124 of shell member 11~. In this manner, the same shell member can be used with any one of the different conductor size sleeves.
Additionally, in currently preferred practice, all surfaces of both shell member 120 and sleeve 13~ are provided with a coating or plating of a suitable material on the order of 0.0002 to 0.004 inches. This plating provides a means for avoiding corrosion that might otherwise take place between the interfaces of a dissimilar material~ of the assembly, as in ~nown in the art.
Further, once the respective members of assembly 116 are formed, they are annealed to remove any residual work hardening intro-duced therein, thereby to facilitate the subsequent cable crimping.
It has been found that notwithstanding the annealing operation, the copper material of shell member 120 retains its relative rigidity particularly with respect to the soft aluminum sleeve.
Moreover, the preferred wall thickness t provides the required rigidity for bending strength to avoid deformation without adversely impacting the crimping forces required to crimp a conductor disposed within the inserted sleeve member 130. Thus, the apparent tradeoff occasioned by the annealing operation nevertheless provides a bending strength comparable to the difficult and expensive to manufacture bi-metallic lug connectors; and, it has been found that the crimping forces are comparable to aluminum alone and are generally no greater than hardened aluminum.
~ eferrin~ now to Figure 9, there is shown a cross-sectional view of an alternate embodiment of the compression connector in accordance with the principles of the pre~ent invention.
_ g _ . . . - .
:. : --. : .
::,. : : .
~1~57~9 Compression connector 116' is similar to connector 16 of the previous drawing figures and like elements bear li]ce reference numerals. Connector 116' includes a turned or rolled over por-tion 122' which functions to capture and retainingly engage sleeve 130 as previously described.
What has been taught, then, is a compression connector assembly for use with elbow terminator devices and facilitating, notably, a rigid structural configuration which avoids deforma-tion of the threaded portion of the shell member of the connector assembly without significantly impacting the required crimping forces. The form of the invention illustrated and described herein is but a preferred embodiment of these teachings in the form currently preferred for manufacture. It is shown as a illustration of the inventive concepts, however, rather than by way of limitation, and it is pointed out that various modi-fications and alterations may be indulged in within the scope of the appended claims.
:, ~ .,,
Claims (8)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A compression connector assembly for use with an elbow connector housing having a first opening for coaxially receiving an exposed end of an insulated cable and a second transverse opening for receiving a male electrode, said compression connector comprising in combination:
a connector shell having a rigid flattened portion at one end thereof and a hollow generally tubular portion at the other end thereof, the inside diameter of said tubular portion being substantially greater than the diameter of said exposed end of said cable, said flattened portion having a threaded bore hole therein the axis of which extends transversely of the tubular axis of said shell for receiving the threaded end of said electrode in threaded conductive engagement therewith;
a relatively soft sleeve concentrically mounted within the hollow tubular portion of said shell for receiving and crimping the exposed end of said cable therein; and, said flattened portion being sufficiently rigid to provide substantial bending strength to avoid deformation of said connector at its threaded engagement with said male electrode when said cable is flexed or moved in a direction generally perpendicular to the axis thereof, and said tubular portion having a thin wall thickness relative to the diameter of said tubular portion to provide a reduced wall thickness wherein said tubular portion is relatively deformable in conformity with the crimping deformation of said soft sleeve and by a force which is on the order of the crimping forces of said soft sleeve.
a connector shell having a rigid flattened portion at one end thereof and a hollow generally tubular portion at the other end thereof, the inside diameter of said tubular portion being substantially greater than the diameter of said exposed end of said cable, said flattened portion having a threaded bore hole therein the axis of which extends transversely of the tubular axis of said shell for receiving the threaded end of said electrode in threaded conductive engagement therewith;
a relatively soft sleeve concentrically mounted within the hollow tubular portion of said shell for receiving and crimping the exposed end of said cable therein; and, said flattened portion being sufficiently rigid to provide substantial bending strength to avoid deformation of said connector at its threaded engagement with said male electrode when said cable is flexed or moved in a direction generally perpendicular to the axis thereof, and said tubular portion having a thin wall thickness relative to the diameter of said tubular portion to provide a reduced wall thickness wherein said tubular portion is relatively deformable in conformity with the crimping deformation of said soft sleeve and by a force which is on the order of the crimping forces of said soft sleeve.
2. The compression connector according to Claim 1, wherein said shell is impact extruded from copper material.
3. The compression connector according to Claim 2, wherein said sleeve is of an aluminum material.
4. The compression connector according to Claim 3, wherein said shell and said sleeve are annealed to substantially remove any residual work hardening.
5. The compression connector according to Claim 3, wherein the wall thickness of said hollow tubular portion of said shell is on the order of 0.040 to 0.100 inches.
6. The compression connector according to Claim 5, wherein said thickness is approximately 0.050 inches.
7. The compression connector according to Claim 1, wherein said shell includes means for retaining said sleeve therein.
8. The compression connector according to Claim 7, wherein said means for retaining comprises a radially inwardly turned portion of said hollow tubular portion.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US92716778A | 1978-07-21 | 1978-07-21 | |
| US927,167 | 1978-07-21 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1115799A true CA1115799A (en) | 1982-01-05 |
Family
ID=25454314
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA331,793A Expired CA1115799A (en) | 1978-07-21 | 1979-07-13 | Compression connector for primary elbow terminator |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1115799A (en) |
-
1979
- 1979-07-13 CA CA331,793A patent/CA1115799A/en not_active Expired
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