EP0022627B1 - Electrical connector for terminating coaxial electrical cable - Google Patents
Electrical connector for terminating coaxial electrical cable Download PDFInfo
- Publication number
- EP0022627B1 EP0022627B1 EP80302052A EP80302052A EP0022627B1 EP 0022627 B1 EP0022627 B1 EP 0022627B1 EP 80302052 A EP80302052 A EP 80302052A EP 80302052 A EP80302052 A EP 80302052A EP 0022627 B1 EP0022627 B1 EP 0022627B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- ferrule
- cable
- body member
- fingers
- outer conductor
- 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
Links
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R9/00—Structural associations of a plurality of mutually-insulated electrical connecting elements, e.g. terminal strips or terminal blocks; Terminals or binding posts mounted upon a base or in a case; Bases therefor
- H01R9/03—Connectors arranged to contact a plurality of the conductors of a multiconductor cable, e.g. tapping connections
- H01R9/05—Connectors arranged to contact a plurality of the conductors of a multiconductor cable, e.g. tapping connections for coaxial cables
Definitions
- This invention relates to an electrical connector for terminating coaxial electrical cable, and particularly cable of the type having a tubular solid outer conductor, for example of copper, surrounding a dielectric member which in turn surrounds a centre conductor.
- Known methods of terminating such cable, and in particular of establishing an electrical connection to the outer conductor thereof include the use of solder, or the use of an electrical connector including a back-up member which is inserted between the outer conductor and the dielectric layer and a crimping sleeve which is then crimped on to the outer conductor over the back-up member.
- This known electrical connector comprises a tubular conductive body member having two axially aligned portions of mutually different internal diameter, through both of which portions the cable can pass, and a ferrule locatable within the larger internal diameter portion of the body member with the cable passing through the ferrule, the ferrule being deformable under forces applied thereto axially of the cable thereby to secure the cable within the body with the outer conductor of the cable electrically connected to the body member.
- the ferrule is of ductile material and is contained wholly within the larger internal diameter portion of the body member, the axial forces applied to the ferrule causing inelastic deformation thereof and also slight deformation of the body member and the outer conductor of the cable, the deformation being such as to provide residual stress in the body member and in the cable sufficient to lock the body member to the cable and thus provide the required electrical and mechanical connection.
- a difficulty which arises with this known connector is that in order to compress the ferrule axially as required a tool must be used, which has a part which can enter the larger internal diameter portion of the body member while surrounding the cable, and this can cause difficulties with connectors of relatively small size. Further, the tooling used must comprise a plurality of parts which must be assembled about a connector and cable to be connected and which must be disassembled and removed after use.
- DE-B-1 1 17 687 there is disclosed another connector of similar form in which the ferrule has an outwardly directed flange at one end, and a plurality of axially extending blunt ended fingers extending from the periphery at the other end.
- the smaller internal diameter portion of the body member tapers inwardly in the direction away from the larger internal diameter portion such that as the fingers on the ferrule are urged into the smaller internal diameter portion of the body member, by a nut member engaged with the body member, the fingers are deflected inwardly such that their blunt ends bite into and grip the outer conductor of the cable and thus establish an electrical connection thereto.
- a difficulty which arises with this known connector is that the fingers on the ferrule are relatively thick, and this, together with their blunt ends and the tapering form of the smaller internal diameter portions of the body member, results in only the tips of the fingers engaging the outer conductor of the cable with any force; that there is only a very small area of contact between the fingers and the outer conductor, this being undesirable, particularly when the cable is to carry high frequency signals. Further, there is little movement of the ferrule axially along the cable in gripping engagement therewith, such movement being desirable to break down any insulating oxide coatings present on the cable or ferrule and thus ensure a satisfactory electrical connection.
- an electrical connector for terminating coaxial electrical cable of the type having a tubular solid outer conductor comprising a tubular conductive body member having two axially aligned portions of mutually different internal diameter, through both of which portions the cable can pass, and a ferrule locatable within the larger internal diameter portion of the body member with the cable passing therethrough, the ferrule having an outwardly directed annular flange at one end, and a plurality of fingers extending from the periphery at the other end and parallel to the axis of the ferrule, the arrangement being such that with the fingers on the ferrule directed towards the smaller internal diameter portion of the body member, movement of the ferrule along the cable with the body member held fixed relative to the cable, causes the fingers on the ferrule to be deflected inwardly on entry into the smaller diameter end portion of the body member, the fingers engaging the outer conductor of the cable whereby an electrical connection is established between the outer conductor of the cable and the body member, characterised in that the ferrul
- the connector of this invention has the advantages that there is a high area of contact between the ferrule and the outer conductor of the cable provided by the fingers and the body portion of the ferrule, and since the fingers are compressed into penetrating engagement with the outer conductor no difficulties due to oxide coatings arise.
- the connector shown in Figures 1 to 4 is for terminating a coaxial electrical cable 100 having a semi-rigid tubular solid outer conductor 101 which surrounds a dielectric material layer 102 which in turn surrounds a solid centre conductor 103, and comprises a tubular conductive metal body member 1 having two axially aligned portions 2 and 3 of mutually different internal diameter, through both of which portions 2 and 3 the cable 100 can pass, as shown in Figure 2.
- the body member 1 is formed with an outwardly directed annular rib 4.
- the larger internal diameter portion 2 of the body member 1 is formed with a plurality of axially extending splines 5, best seen in Figure 1.
- the connector also comprises a coupling ring 6 having a hexagonal external cross-section for cooperation with a spanner and being externally threaded, as shown at 7, from one end, and having an inwardly directed annular lip 8 at the other end.
- the lip 8 defines an aperture which will receive the portion 2 of the body member 1 but will not pass the rib 4 thereof.
- an annular resilient sealing member 9 having an external diameter substantially equal to that of the rib 4 on the body member 1, and an internal diameter to receive the portion 3 of the body member 1 and be retained thereon, and a metal ferrule 10.
- the ferrule 10 comprises a tubular body portion 11 having an outwardly directed annular flange 12 at one end, and a plurality of axially extending pointed fingers 13 extending from the periphery at the other end, the fingers 13 being thinner than the remainder of the ferrule 10.
- the end of the cable 100 is prepared by removal of portions of the outer conductor 101 and dielectric layer 102 to leave a portion of the centre conductor 103 exposed as shown in the drawings, to constitute a centre contact for the connector.
- the sealing member 9 is mounted on the portion 3 of the body member 1 abutting the rib 4, and the coupling ring 6 is mounted on the portion 2 of the body member 1 with the lip 8 abutting the rib 4 and the coupling ring 6 extending over and beyond the portion 3 of the body member 1.
- the ferrule 10 is positioned on the cable 100 with the fingers 13 of the ferrule 10 directed towards the free end of the cable 100, and the free end of the cable 100 is then inserted into the body member 1 through the free end of portion 2 thereof until the end of the outer conductor 101 and dielectric layer 102 are flush with the free end of the portion 3 of the body member 1, as shown in Figure 2.
- the ferrule 10 is then urged along the cable 100 until the fingers 13 and body portion 11 of the ferrule 10 enter the portion 2 of the body member 1.
- the assembly is engaged by a tool (not shown in detail) having a pair of dies one 200 of which (see Figure 3) embraces the cable 100 and engages the flange 12 of the ferrule 10 and the other 201 of which engages the free end of the cable 100 within the coupling ring 6, as shown in Figure 3.
- the die 201 is formed with a blind hole 202 to freely receive the centre contact portion of the centre conductor 103 of the cable 100.
- the dies 200, 201 are then moved axially of the cable 100 towards each other, as indicated by arrows in Figure 3, thereby to urge the ferrule 10 further into the body member 1.
- the fingers 13 thereof are deflected inwardly on entry into the smaller internal diameter portion 3 of the body member 1, the fingers 13 becoming compressed between the outer conductor 101 of the cable 100 and the wall of the portion 3 of the body member 1, causing slight deformation of the outer conductor 101 of the cable 100, whereby the required electrical connection is established between the outer conductor 101 and the body member 1.
- the splines 5 bite into the ferrule body portion 11, as shown in Figure 4, thereby to lock the ferrule 10 to the body member 1 and prevent relative rotary movement therebetween.
- the ferrule 10 is urged into the body member 1 until the flange 12 on the ferrule 10 abuts the free end of the portion 2 of the body member 1, as shown in Figure 3, whereafter the tooling dies 200, 201 are removed leaving the completed connector terminating the cable 100 and ready for mating with an appropriate other connector (not shown) and coupling thereto by means of the coupling ring 6.
- the lip 8 on the coupling ring 6 is positioned between the rib 4 on the body member 1 and the flange 12 on the ferrule 10 whereby the coupling ring 6 is secured to the body member 1 in relatively rotatable manner.
- this other connector uses a separate centre contact member 300 which is crimped to the centre conductor 103 of the cable 100 rather than using the centre conductor 103 itself as the centre contact.
- the contact member 300 is supported, in known manner, within the portion 3 of the body member 1, by a dielectric material insert 301 located at the free end of the portion 2.
Landscapes
- Coupling Device And Connection With Printed Circuit (AREA)
- Multi-Conductor Connections (AREA)
- Details Of Connecting Devices For Male And Female Coupling (AREA)
- Communication Cables (AREA)
- Insulated Conductors (AREA)
Abstract
Description
- This invention relates to an electrical connector for terminating coaxial electrical cable, and particularly cable of the type having a tubular solid outer conductor, for example of copper, surrounding a dielectric member which in turn surrounds a centre conductor.
- Known methods of terminating such cable, and in particular of establishing an electrical connection to the outer conductor thereof, include the use of solder, or the use of an electrical connector including a back-up member which is inserted between the outer conductor and the dielectric layer and a crimping sleeve which is then crimped on to the outer conductor over the back-up member.
- Such known methods are relatively difficult to carry out and do not always provide acceptable connections, since with the use of solder the necessary heat can damage the dielectric layer of the cable, and with the crimping method the necessary flaring of the outer conductor for insertion of the back-up member is particularly difficult with small cables, and can also introduce undesirable changes in characteristic impedance across the connection.
- In US-A-3 533 051 there is described an electrical connector in which these difficulties are overcome.
- This known electrical connector comprises a tubular conductive body member having two axially aligned portions of mutually different internal diameter, through both of which portions the cable can pass, and a ferrule locatable within the larger internal diameter portion of the body member with the cable passing through the ferrule, the ferrule being deformable under forces applied thereto axially of the cable thereby to secure the cable within the body with the outer conductor of the cable electrically connected to the body member.
- In this known connector the ferrule is of ductile material and is contained wholly within the larger internal diameter portion of the body member, the axial forces applied to the ferrule causing inelastic deformation thereof and also slight deformation of the body member and the outer conductor of the cable, the deformation being such as to provide residual stress in the body member and in the cable sufficient to lock the body member to the cable and thus provide the required electrical and mechanical connection.
- A difficulty which arises with this known connector is that in order to compress the ferrule axially as required a tool must be used, which has a part which can enter the larger internal diameter portion of the body member while surrounding the cable, and this can cause difficulties with connectors of relatively small size. Further, the tooling used must comprise a plurality of parts which must be assembled about a connector and cable to be connected and which must be disassembled and removed after use.
- In DE-B-1 1 17 687 there is disclosed another connector of similar form in which the ferrule has an outwardly directed flange at one end, and a plurality of axially extending blunt ended fingers extending from the periphery at the other end. With this known connector the smaller internal diameter portion of the body member tapers inwardly in the direction away from the larger internal diameter portion such that as the fingers on the ferrule are urged into the smaller internal diameter portion of the body member, by a nut member engaged with the body member, the fingers are deflected inwardly such that their blunt ends bite into and grip the outer conductor of the cable and thus establish an electrical connection thereto.
- A difficulty which arises with this known connector is that the fingers on the ferrule are relatively thick, and this, together with their blunt ends and the tapering form of the smaller internal diameter portions of the body member, results in only the tips of the fingers engaging the outer conductor of the cable with any force; that there is only a very small area of contact between the fingers and the outer conductor, this being undesirable, particularly when the cable is to carry high frequency signals. Further, there is little movement of the ferrule axially along the cable in gripping engagement therewith, such movement being desirable to break down any insulating oxide coatings present on the cable or ferrule and thus ensure a satisfactory electrical connection.
- Another known connector is disclosed in US--A-3 879 102, which known connector includes a ferrule in the form of a split ring having a serrated inner surface. The ferrule is moved axially along the cable into a mandrel portion of the body member of the connector, the ferrule being closed up by the mandrel into gripping engagement with the outer conductor of the cable. Here again there is only minimal axial movement of the ferrule along the cable to remove any oxide coatings, and in view of the serrated inner surface of the ferrule, only a relatively small area of contact between the ferrule and the outer conductor of the cable.
- According to this invention there is provided an electrical connector for terminating coaxial electrical cable of the type having a tubular solid outer conductor, comprising a tubular conductive body member having two axially aligned portions of mutually different internal diameter, through both of which portions the cable can pass, and a ferrule locatable within the larger internal diameter portion of the body member with the cable passing therethrough, the ferrule having an outwardly directed annular flange at one end, and a plurality of fingers extending from the periphery at the other end and parallel to the axis of the ferrule, the arrangement being such that with the fingers on the ferrule directed towards the smaller internal diameter portion of the body member, movement of the ferrule along the cable with the body member held fixed relative to the cable, causes the fingers on the ferrule to be deflected inwardly on entry into the smaller diameter end portion of the body member, the fingers engaging the outer conductor of the cable whereby an electrical connection is established between the outer conductor of the cable and the body member, characterised in that the ferrule has a tubular body portion between the flange and the fingers, the fingers being thinner than the body portion, the larger internal diameter portion of the body member being shaped such that on movement of the ferrule axially along the cable the tubular body portion of the ferrule enters the larger internal diameter portion of the body member and is compressed thereby into intimate engagement with the outer conductor of the cable, while the fingers on the ferrule enter the smaller internal diameter portion of the body member, which is cylindrical, and are compressed into intimate penetrating engagement with the outer conductor of the cable for substantially their entire length.
- The connector of this invention has the advantages that there is a high area of contact between the ferrule and the outer conductor of the cable provided by the fingers and the body portion of the ferrule, and since the fingers are compressed into penetrating engagement with the outer conductor no difficulties due to oxide coatings arise.
- This invention will now be described by way of example with reference to the drawings, in which:
- Figure 1 is an exploded perspective view of a connector according to this invention;
- Figure 2 is a longitudinal sectional view of the connector of Figure 1 in a partly assembled state;
- Figure 3 is a view similar to Figure 2 but showing the connector fully assembled, and also showing part of the tooling used for assembly;
- Figure 4 is a view on the line IV-IV in Figure 3;
- Figure 5 is a perspective view of a centre contact member for use in another connector according to this invention; and
- Figure 6 is a longitudinal sectional view of the other connector in the assembled state.
- The connector shown in Figures 1 to 4 is for terminating a coaxial
electrical cable 100 having a semi-rigid tubular solidouter conductor 101 which surrounds adielectric material layer 102 which in turn surrounds asolid centre conductor 103, and comprises a tubular conductive metal body member 1 having two axially alignedportions 2 and 3 of mutually different internal diameter, through both of whichportions 2 and 3 thecable 100 can pass, as shown in Figure 2. At the junction between itsportions 2 and 3 the body member 1 is formed with an outwardly directedannular rib 4. The largerinternal diameter portion 2 of the body member 1 is formed with a plurality of axially extendingsplines 5, best seen in Figure 1. - The connector also comprises a
coupling ring 6 having a hexagonal external cross-section for cooperation with a spanner and being externally threaded, as shown at 7, from one end, and having an inwardly directedannular lip 8 at the other end. Thelip 8 defines an aperture which will receive theportion 2 of the body member 1 but will not pass therib 4 thereof. - Completing the connector are an annular resilient sealing member 9 having an external diameter substantially equal to that of the
rib 4 on the body member 1, and an internal diameter to receive the portion 3 of the body member 1 and be retained thereon, and ametal ferrule 10. - The
ferrule 10 comprises atubular body portion 11 having an outwardly directedannular flange 12 at one end, and a plurality of axially extendingpointed fingers 13 extending from the periphery at the other end, thefingers 13 being thinner than the remainder of theferrule 10. - For use of the connector described above, the end of the
cable 100 is prepared by removal of portions of theouter conductor 101 anddielectric layer 102 to leave a portion of thecentre conductor 103 exposed as shown in the drawings, to constitute a centre contact for the connector. - The sealing member 9 is mounted on the portion 3 of the body member 1 abutting the
rib 4, and thecoupling ring 6 is mounted on theportion 2 of the body member 1 with thelip 8 abutting therib 4 and thecoupling ring 6 extending over and beyond the portion 3 of the body member 1. - The
ferrule 10 is positioned on thecable 100 with thefingers 13 of theferrule 10 directed towards the free end of thecable 100, and the free end of thecable 100 is then inserted into the body member 1 through the free end ofportion 2 thereof until the end of theouter conductor 101 anddielectric layer 102 are flush with the free end of the portion 3 of the body member 1, as shown in Figure 2. - The
ferrule 10 is then urged along thecable 100 until thefingers 13 andbody portion 11 of theferrule 10 enter theportion 2 of the body member 1. The assembly is engaged by a tool (not shown in detail) having a pair of dies one 200 of which (see Figure 3) embraces thecable 100 and engages theflange 12 of theferrule 10 and the other 201 of which engages the free end of thecable 100 within thecoupling ring 6, as shown in Figure 3. The die 201 is formed with ablind hole 202 to freely receive the centre contact portion of thecentre conductor 103 of thecable 100. - The
dies cable 100 towards each other, as indicated by arrows in Figure 3, thereby to urge theferrule 10 further into the body member 1. On such movement of theferrule 10 thefingers 13 thereof are deflected inwardly on entry into the smaller internal diameter portion 3 of the body member 1, thefingers 13 becoming compressed between theouter conductor 101 of thecable 100 and the wall of the portion 3 of the body member 1, causing slight deformation of theouter conductor 101 of thecable 100, whereby the required electrical connection is established between theouter conductor 101 and the body member 1. As theferrule 10 is urged into theportion 2 of the body member 1 thesplines 5 bite into theferrule body portion 11, as shown in Figure 4, thereby to lock theferrule 10 to the body member 1 and prevent relative rotary movement therebetween. - The
ferrule 10 is urged into the body member 1 until theflange 12 on theferrule 10 abuts the free end of theportion 2 of the body member 1, as shown in Figure 3, whereafter the tooling dies 200, 201 are removed leaving the completed connector terminating thecable 100 and ready for mating with an appropriate other connector (not shown) and coupling thereto by means of thecoupling ring 6. From Figure 3 it can be seen that thelip 8 on thecoupling ring 6 is positioned between therib 4 on the body member 1 and theflange 12 on theferrule 10 whereby thecoupling ring 6 is secured to the body member 1 in relatively rotatable manner. - Referring now to Figures 5 and 6, the connector here shown is similar to that of Figures 1 to 4 and corresponding parts have the same reference numbers.
- The essential difference is that this other connector uses a separate
centre contact member 300 which is crimped to thecentre conductor 103 of thecable 100 rather than using thecentre conductor 103 itself as the centre contact. Thecontact member 300 is supported, in known manner, within the portion 3 of the body member 1, by adielectric material insert 301 located at the free end of theportion 2.
Claims (3)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT80302052T ATE3924T1 (en) | 1979-07-09 | 1980-06-18 | ELECTRICAL CONNECTOR FOR CONNECTING ELECTRICAL COAXIAL CABLES. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US5556479A | 1979-07-09 | 1979-07-09 | |
US55564 | 1979-07-09 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0022627A1 EP0022627A1 (en) | 1981-01-21 |
EP0022627B1 true EP0022627B1 (en) | 1983-06-22 |
Family
ID=21998700
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP80302052A Expired EP0022627B1 (en) | 1979-07-09 | 1980-06-18 | Electrical connector for terminating coaxial electrical cable |
Country Status (8)
Country | Link |
---|---|
EP (1) | EP0022627B1 (en) |
JP (1) | JPS5953668B2 (en) |
AT (1) | ATE3924T1 (en) |
BR (1) | BR8004230A (en) |
CA (1) | CA1132215A (en) |
DE (1) | DE3063872D1 (en) |
ES (1) | ES493189A0 (en) |
HK (1) | HK81586A (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0167738A3 (en) * | 1984-06-04 | 1987-07-22 | Allied Corporation | Electrical connector having means for retaining a coaxial cable |
US4921447A (en) * | 1989-05-17 | 1990-05-01 | Amp Incorporated | Terminating a shield of a malleable coaxial cable |
US6309251B1 (en) * | 2000-06-01 | 2001-10-30 | Antronix, Inc. | Auto-seizing coaxial cable port for an electrical device |
US7727020B2 (en) * | 2008-09-05 | 2010-06-01 | Delphi Technologies, Inc. | Cable connector |
US8585438B2 (en) | 2012-03-21 | 2013-11-19 | Antronix, Inc. | Ground maintaining auto seizing coaxial cable connector |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1117687B (en) * | 1960-07-05 | 1961-11-23 | Georg Spinner Dipl Ing | Connector fitting for coaxial high-frequency cables with solid metal sheath |
US3537065A (en) * | 1967-01-12 | 1970-10-27 | Jerrold Electronics Corp | Multiferrule cable connector |
US3448430A (en) * | 1967-01-23 | 1969-06-03 | Thomas & Betts Corp | Ground connector |
US3544705A (en) * | 1968-11-18 | 1970-12-01 | Jerrold Electronics Corp | Expandable cable bushing |
DE2331610A1 (en) * | 1973-06-20 | 1975-01-16 | Spinner Georg | CABLE CONNECTORS FOR FULLY INSULATED COAXIAL CABLES |
US3879102A (en) * | 1973-12-10 | 1975-04-22 | Gamco Ind Inc | Entrance connector having a floating internal support sleeve |
-
1980
- 1980-06-10 CA CA353,728A patent/CA1132215A/en not_active Expired
- 1980-06-18 EP EP80302052A patent/EP0022627B1/en not_active Expired
- 1980-06-18 DE DE8080302052T patent/DE3063872D1/en not_active Expired
- 1980-06-18 AT AT80302052T patent/ATE3924T1/en not_active IP Right Cessation
- 1980-07-08 BR BR8004230A patent/BR8004230A/en not_active IP Right Cessation
- 1980-07-08 ES ES493189A patent/ES493189A0/en active Granted
- 1980-07-08 JP JP55093200A patent/JPS5953668B2/en not_active Expired
-
1986
- 1986-10-30 HK HK815/86A patent/HK81586A/en not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
HK81586A (en) | 1986-11-07 |
DE3063872D1 (en) | 1983-07-28 |
JPS5953668B2 (en) | 1984-12-26 |
ES8103494A1 (en) | 1981-02-16 |
EP0022627A1 (en) | 1981-01-21 |
CA1132215A (en) | 1982-09-21 |
ATE3924T1 (en) | 1983-07-15 |
JPS5615573A (en) | 1981-02-14 |
ES493189A0 (en) | 1981-02-16 |
BR8004230A (en) | 1981-01-21 |
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