WO2005074076A1 - Clamping and sealing mechanism with multiple rings for cable connector - Google Patents
Clamping and sealing mechanism with multiple rings for cable connector Download PDFInfo
- Publication number
- WO2005074076A1 WO2005074076A1 PCT/US2005/001965 US2005001965W WO2005074076A1 WO 2005074076 A1 WO2005074076 A1 WO 2005074076A1 US 2005001965 W US2005001965 W US 2005001965W WO 2005074076 A1 WO2005074076 A1 WO 2005074076A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- rings
- mandrel
- cable
- sealing ring
- connector
- Prior art date
Links
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
- H01R9/0518—Connection to outer conductor by crimping or by crimping ferrule
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
- H01R13/46—Bases; Cases
- H01R13/52—Dustproof, splashproof, drip-proof, waterproof, or flameproof cases
- H01R13/5205—Sealing means between cable and housing, e.g. grommet
-
- 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
- H01R9/0521—Connection to outer conductor by action of a nut
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R2103/00—Two poles
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R24/00—Two-part coupling devices, or either of their cooperating parts, characterised by their overall structure
- H01R24/38—Two-part coupling devices, or either of their cooperating parts, characterised by their overall structure having concentrically or coaxially arranged contacts
- H01R24/40—Two-part coupling devices, or either of their cooperating parts, characterised by their overall structure having concentrically or coaxially arranged contacts specially adapted for high frequency
Definitions
- This invention relates generally to the field of cable connectors, and more particularly to a cable connector having multiple rings which provide the required clamping and sealing function via an interference fit between a ground sheath of a coaxial cable and a grounded portion of the connector body.
- Coaxial cable connectors whether connecting coaxial cable to an equipment port or two cables to each other, rely on RF (radio frequency) shielding to prevent stray RF emanations from entering the cable system. It is important to ensure that the ground path is well established through the connector to thwart unwanted signals from penetrating the system. At the same time, it is important to prevent external environmental effects, such as moisture or grit, from entering the connector and degrading the shielding performance of the connector.
- RF radio frequency
- a two-piece cable connector includes a connector body and a threaded nut or compression fitting that attaches at a first end of the connector body.
- Two series of rings are interleaved with tapered sides adjacent each other, with the rings being fitted inside the connector body outside a portion of a mandrel.
- Two plastic rings are fitted adjacent the gapped metal rings at the first end of the connector body.
- the threaded nut or compression fitting drives the plastic rings against each other and the inboard ring against the series of rings in wedging engagement, thus creating an interference fit among the grounded comiector body, the series of rings, a ground sheath of a coaxial cable, and the mandrel.
- the two plastic rings form a seal protecting the inside of the cable connector from the environment.
- a cable connector includes a connector body having a cavity therein; a mandrel fitted inside the cavity for receiving a prepared coaxial cable end at an end of the connector body; a first plurality of rings fitted between a portion of the mandrel and the connector body and a second plurality of rings fitted between the first portion of the mandrel and the connector body, the first plurality of rings and the second plurality of rings having wedge-shaped cross-sections; the first plurality of rings and the second plurality of rings being interleaved with one another so that adjacent surfaces of first plurality of rings and the second plurality of rings are in tapered relationship with each other; at least the first plurality of rings being of electrically conductive material; a first sealing ring having a wedge-shaped cross section adjacent to one of the second plurality of rings and in tapered relationship with the one of the second plurality of rings, the first sealing ring being closer to the end of the connector body than the first and second pluralities of rings; a second sealing ring having a wedge-shaped cross section adjacent
- a method for constructing a cable connector includes the steps of (a) providing a connector body having a cavity therein; (b) providing a mandrel fitted inside the cavity for receiving a prepared coaxial cable end at an end of the connector body; (c) providing a first plurality of rings fitted between a portion of the mandrel and the connector body and a second plurality of rings fitted between the first portion of the mandrel and the connector body, wherein the first plurality of rings and the second plurality of rings have wedge-shaped cross-sections, and wherein at least the first plurality of rings are of electrically conductive material; (d) interleaving the first plurality of rings and the second plurality of rings with one another so that adjacent surfaces of first plurality of rings and the second plurality of rings are in tapered relationship with each other; (e) providing a first sealing ring having a wedge- shaped cross section adjacent to one of the second plurality of rings and in tapered relationship with the one of the second plurality
- FIG. 1 shows a perspective view of a typical two-piece pin connector according to the prior art.
- FIG. 2 shows a cutaway perspective view of the prior art connector of Fig. 1.
- FIG. 3 shows an exploded perspective view of the prior art connector of Fig. 1.
- FIG. 4 shows a perspective view of a typical three-piece connector according to the prior art.
- FIG. 5 shows a cutaway perspective view of the prior art comiector of Fig. 4.
- FIG. 6 shows an exploded perspective view of the prior art connector of Fig. 4.
- Fig. 7 shows a perspective view of a two-piece connector according to an embodiment of the invention.
- Fig. 8 shows a cutaway perspective view of the embodiment of Fig. 7.
- Fig. 9 shows an exploded perspective view of the embodiment of Fig. 7.
- Fig. 10 shows a perspective view of a two-piece connector according to an embodiment of the invention.
- FIG. 11 shows a cutaway perspective view of the embodiment of Fig. 10.
- Fig. 12 shows an exploded perspective view of the embodiment of Fig. 10.
- Fig. 13 shows a perspective view of a three-piece comiector according to an embodiment of the invention.
- Fig. 14 shows a cutaway perspective view of the embodiment of Fig. 13.
- Fig. 15 shows an exploded perspective view of the embodiment of Fig. 13.
- a prior art two-piece cable connector 100 includes a nut 104 fastened onto a connector body 102.
- a clamp 106 is pressed against a prepared cable ground sheath (not shown) of a coaxial cable (not shown) as nut 104 is tightened onto connector body 102.
- An O-ring 108 seals against an outer coating (not shown) of the coaxial cable to prevent moisture or contaminants from affecting the cable connection with cable comiector 100. It is evident in Fig. 3 that the component pieces cable connector 100, although not numerous, have to be specially made in the right configurations of the proper materials in order to have cable comiector 100 work properly.
- a prior art three-piece connector 110 includes a front body 112, a back body 114 screwed onto front body 112, and a nut 116 screwed onto back body 114.
- a clamp 118 presses against the prepared cable ground sheath when nut 116 is tightened onto back body 114, while an O-ring 120 performs the necessary sealing function.
- a conducting material such as metal
- a comiector body 18 provides a housing for an end of the cable (not shown) which is connected to an equipment port (not shown) via a grounded end 32 and a conductive pin 24.
- Conductive pin 24 is electrically connected to a center conductor (not shown) of the cable while end 32 of body 18 is electrically connected to the ground sheath (not shown) of the cable, as is explained below.
- the invention is not dependent on the particular type of cable connector shown here, but is applicable to any connection between a cable and a cable comiector.
- Conductive pin 24 is held in place in body 18 by an insulator 36, which also prevents conductive pin 24 from making electrical contact with body 18.
- Body 18 has to be electrically conductive because it constitutes part of the ground path from the cable ground sheath to end 32 which is connectable to the grounding circuit of the equipment port.
- the cable end is prepared for connection to connector 5 by stripping part of a dielectric layer (not shown) away from the center conductor of the cable, and by stripping away part of an insulating layer (not shown) covering the ground sheath when the cable includes an insulating layer.
- the prepared cable end is inserted into comiector 5 through a nut 10 and then an end 34 of body 18 so that the center conductor is guided by a portion 38 of a mandrel 20 into a collet 28.
- Collet 28 preferably includes threads 40 to provide an interference fit with the cable center conductor.
- the dielectric layer of the cable fits inside a main cavity 42 of mandrel 20, while the ground sheath of the cable fits between a surface portion 30 of mandrel 20 and a plurality of rings made up of inner rings 16 and outer rings 26.
- Inner rings 16 preferably provide electrical continuity and grip the cable ground sheath when nut 10 is tightened, while the tapered surfaces of outer rings 26 guide inner rings 16 into position when nut 10 is tightened.
- a deformable segmented ring 46 is preferably between a shoulder of mandrel 20 and the forwardmost inner ring 16.
- Surface portion 30 of mandrel 20 is preferably scored to enhance the interference fit between mandrel 20 and the ground sheath of the cable.
- An inner ring 14 and an outer ring 12 are preferably of plastic. Inner ring 14 grips the cable ground sheath when nut 10 is tightened, while inner ring 14 and outer ring 12 provide the sealing function provided by O-ring 108 (Figs. 1-3) and O-ring 120 (Figs. 4- 6) in the prior art. Note that inner ring 14 and inner rings 16 are adjacent at least one outer ring 26. Cross-sections of rings 14, 16, 26, and 46 are all wedge shaped, i.e., shaped substantially as trapezoids, with adjacent rings touching each other via tapered sides. Outer ring 12 is preferably adjacent inner ring 14. A flat portion of outer rings 26 and outer ring 12 is adjacent and touching body 18, while a flat portion of inner ring 14 and inner rings 16 is adjacent and touching the ground sheath of the cable.
- Rings 46, 16, and 26 are preferably of a conducting material with metal being the preferred material, but not all of rings 16 and 26 have to be electrically conductive as long as ring 46 and the forwardmost ring 16 are electrically conductive to provide the electrical ground path from the cable ground sheath to connector body 18.
- Inner rings 16 are preferably gapped rings, i.e., a portion is missing in the angular direction of the ring, so that the gap permits the inner diameter of the rings to contract when a force is applied to the outside diameter of the rings.
- Rings 12 and 14 are preferably complete rings and made of plastic, but when conventional O-ring sealing is used instead as in the prior art, rings 12 and 14 can be of metal instead of plastic, i.e., metal rings 12 and 14 in conjunction with an O-ring will also perform the sealing function required.
- Ring 14 in turn applies pressure on the series of rings 16 and 26, which provide an interference fit with each other, portion 44 of body 18, and the ground cable sheath, as well as an interference fit between the ground cable sheath and surface 30 of mandrel 20. Because metal rings 16 and 26 provide good electrical contact in several narrow, high pressure bands, as well as -providing a good mechanical grip, they thus replace both the sheath clamp and the RF clamp common in the prior art. When ring 12 is of plastic, ring 12 also acts as a thrust bearing between rotating nut 10 and rings 16, 26 which should not rotate in order to avoid twisting of the cable during installation.
- mandrel 20 can be of a non-conducting material such as plastic because mandrel 20 is not needed to establish any part of the ground circuit between the cable ground sheath and body 18.
- a plastic mandrel 20 can thus be designed to simply reinforce mechanically the ground sheath to keep it from collapsing due to the compression action of rings 16, 26.
- High performance thermoplastics provide the necessary strength to serve the mechanical reinforcement function.
- Using a plastic mandrel 20 also eliminates possible electrical shorting between the center conductor and the ground circuit.
- Using a plastic mandrel 20 also permits the use of a plurality of spring leafs 22 preferably made one-piece with mandrel 20 to help exert opening forces to disengage mandrel 20 from collet 28 when disassembling connector 5.
- the use of plastic spring leafs 22 does away with using a metal coil for the purpose as is known in the prior art, which eliminates the complicating effects of the metal coil on the RF signal transmission capability of the connector.
- Portion 38 of mandrel 20 is part of the seizure bushing known in the prior art, which in this embodiment can be made one- piece with mandrel 20.
- a cable connector 50 includes a connector body 52 with a nut 54 which screws onto connector body 52.
- a conductive pin which is to make electrical contact with the center conductor of the prepared cable is held in place by an insulator 58.
- a collet 60 seizes the center conductor of the cable when the cable end is attached to cable connector 50.
- a mandrel 62 helps to guide the prepared cable end during installation as well as forcing the ground sheath of the cable to be separated from the dielectric layer of the cable.
- the ground sheath is captured between mandrel 62 and a plurality of inner rings 66.
- Outer rings 64 and 68 are similar to outer rings 46 and 26 of the embodiment of Figs. 7-9, while inner rings 66 are similar to inner rings 16 of the embodiment of Figs. 7-9.
- Inner ring 70 performs a similar function as inner ring 14, while outer ring 72 performs a similar function as outer ring 12.
- the difference between this embodiment and the embodiment of Figs. 7-9 is the fashion in which nut 54 connects with mandrel 62, and this alternate embodiment is presented to show how the multiple clamping and sealing rings of the present invention can be adapted to different connector body coupler configurations.
- a three-piece pin connector is shown in which a cable connector 76 includes a front body 78, a back body 80, and a nut 82.
- the purpose of the three-piece pin connector is to allow fastening front body 78 to an equipment port before connecting the cable to back body 80 and screwing the combination of the cable and back body 80 to front body 78.
- Screwing nut 82 forces the clamping and sealing mechanism of the invention against both back body 80 and the prepared cable end.
- a conductive pin 84 is held in place by an insulator 86.
- a collet 88 at one end of conductive pin 84 receives the center conductor of the cable as it is guided by a bushing/guide 90.
- a mandrel 92 receives the dielectric layer of the cable end on its inside, with the conductive ground sheath positioned between mandrel 92 and the clamping and sealing mechanism of the present invention, which includes inner rings 96, inner ring 98, outer rings 97, and outer ring 99.
- a thrust bearing 91 ensures that the cable is not twisted as back body 80 is screwed onto front body 78.
- the ring corresponding to ring 46 in the embodiment of Figs. 7-9 and to ring 64 in the embodiment of Figs. 10-12 is replaced functionally by a beveled shoulder 94 which is part of back body 80.
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/764,782 US6808415B1 (en) | 2004-01-26 | 2004-01-26 | Clamping and sealing mechanism with multiple rings for cable connector |
US10/764,782 | 2004-01-26 |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2005074076A1 true WO2005074076A1 (en) | 2005-08-11 |
WO2005074076B1 WO2005074076B1 (en) | 2005-11-10 |
Family
ID=33160106
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US2005/001965 WO2005074076A1 (en) | 2004-01-26 | 2005-01-19 | Clamping and sealing mechanism with multiple rings for cable connector |
Country Status (2)
Country | Link |
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US (1) | US6808415B1 (en) |
WO (1) | WO2005074076A1 (en) |
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-
2004
- 2004-01-26 US US10/764,782 patent/US6808415B1/en not_active Expired - Lifetime
-
2005
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Also Published As
Publication number | Publication date |
---|---|
WO2005074076B1 (en) | 2005-11-10 |
US6808415B1 (en) | 2004-10-26 |
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