US3907399A - HF coaxial plug connector - Google Patents

HF coaxial plug connector Download PDF

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Publication number
US3907399A
US3907399A US42390873A US3907399A US 3907399 A US3907399 A US 3907399A US 42390873 A US42390873 A US 42390873A US 3907399 A US3907399 A US 3907399A
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Prior art keywords
clamping ring
external conductor
ring
plug connector
nut
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Expired - Lifetime
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Georg Spinner
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Georg Spinner
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    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01RELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R9/00Structural 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
    • H01R9/03Connectors arranged to contact a plurality of the conductors of a multiconductor cable, e.g. tapping connections
    • H01R9/05Connectors arranged to contact a plurality of the conductors of a multiconductor cable, e.g. tapping connections for coaxial cables
    • H01R9/0521Connection to outer conductor by action of a nut

Abstract

The specification describes a HF coaxial plug connector with a clamping ring, on whose end face the external cable conduction is crimped and which with an axial clamping action presses the crimped-over end of the external conductor against an end contact annular surface of the plug connector for the purpose of making electrical contact. A nut acts on an intermediate ring which presses the clamping ring toward the connector.

Description

United States Patent 1191 Spinner 1 Sept. 23, 1975 [54] HF COAXIAL PLUG CONNECTOR 3,778,535 12 1973 Forney 174/89 x [76] Inventor: Georg Spinner, Erzgiessereistr. 33, 8 FOREIGN PATENTS O AP LIC IO S Munich Germany 505,834 9/1954 Canada 339/177 R 904,827 12/1959 United Kingdom 339/177 R [22] 1973 1,265,356 5/1961 France 174/89 [21] Appl. No.: 423,908 1,439,160 4/1966 France 339/177 R 1,037,546 8/1958 Germany 174/89 [30] Foreign Application Priority Data primary Examiher joseph Mcclynn Dec. 12, 1972 Germany 2260734 Assistant Exa'mz'nerH0ward N. Goldberg Attorney, Agent, or Firm-Ostrolenk, Faber, Gerb & [52] US. Cl. 339/177 R; 174/89 Soffen [51] Int. Cl. l-[OIR 17/18 [58] Field of Search 339/177 R, 177 E; [57] ABSTRACT [74/75 88 89 The specification describes a HP coaxial plug connector with a clamping ring, on whose end face the exter- [56] References cued nal cable conduction is crimped and which with an UNITED STATES PATENTS axial clamping action presses the crimped-over end of 2,671,127 3/1954 Hope 174/89 X the external conductor against an end contact annular ,110,756 11/1963 Genung et 21].... 339/177 R X surface of the plug connector for the purpose of mak- 3,171,707 3/1965 POWCll 174/89 X electrical ontact A nut acts on an intermediate 314981647 3/1970 Schmder 339/[77 R X ring which presses the clamping ring toward the con- 3,740,453 6/1973 Callaghan 339/177 R X nector 3,761,870 9/1973 Drezin et a1. 339/177 R I 3,769,444 10/1973 Malik 174/89 X 8 Claims, 2 Drawing Figures RA;- fill i x XxA xx/ ;O66166666 13666( 3s ,21] 2 1 /fi/// f US Patent Sept. 23,1975 Sheet 1 of2 3,907,399

fX///x///xxA/ I HF COAXIAL PLUG CONNECTOR BACKGROUND OF INVENTION 1 Field to which invention relates The invention relates to a I-IF coaxial plug connector with aclarnping ring, on whose end face the external cable conductor is crimped and which with an axial clamping action presses the crimped over end of the external conductoragainst an endcontact annular surface, of the plug connector for the purpose of making electrical contact.

2. The prior, art

In the case of prior art plug connector and connecting fittings respectively of this construction the axial clamping action is brought about via a sealing ring consisting of elastic material, which in the case of axial clampingis pressed owing to the incompressibility of the material with a radial sealing pressure against the plug connector head and the external cable casing. This leads to a very simple construction which is satisfactory as regards electrical contacting and sealing, and. which has proven successful on a large scale.

Difficulties may occur if the external cable conductor is surroundedby a plastic material consisting for example of PVC, which inclines to flow. If sucha plastic casing is caused by the influence of theradial sealing pressure, which is exerted by the elastic sealing ring, to yield after a certain time to this pressure and flows there is a reduction in a corresponding manner of the axial pressure exerted on the clamping ring and there is therefore also a reduction in the contacting pressure between the crimped over end of the external cable conductor and the contact end face of the plug connector head.

SUMMARY OF INVENTION One aim of the invention is to provide a universally applicable coaxial plug connector with a fixing action which ensures the necessary axial contact pressure reliably over long periods of time.

In accordance withone aspect the invention attains this aim in that the connecting force of the axialclamping is enclosed via rigid metallic ring bodies. This ensures that the clamping axial pressure, once it has been set,.rem ains, because the sealing material no longer takes place inforce transmission. The sealing action is carried out in accordance with a preferred embodiment of the invention via one 'o'r'more sealing rings, which.

are placed in external or, respectively, internal peripheral grooves'of a pressure transmitting sleeve, which transmits theaxial clamping pressure from a nut with an internal shoulder to the'clamping' ring. I

There has also been a prior proposal to provide a slit or slot in the clamping ring'in order to'make possible a closing of this clamping ring with a concomitant reduction in diameter 'so'that accordingly the clamping ring is pressed with a radial pressure on the external cable conductor. This isp'articularly convenient in the case of cables, whose external conductors are formed by a braided wire casing. In the ease of previously proposed cable plug connectors with a'slit clamping ring the latter is pressed together by the radial sealing pressure force of the axially clampedsealing rings. If for the above-mentioned reasons the axial clamping force de creases there will be a concomitant, parallel decrease in the force which radially presses the clamping ring against the external conductor. In order to avoid this,

9 FIG. 1) and a recess which is offset by The clampthere is the-provision in accordance with a further form of the invention that the pressure annular faces of the clamping ring and thepressure transmitting sleeve are to be so conieally constructedthat in the case of axial clamping via the conical pressing faces the clamping ring is drawn togetherv and pressed radially inwards. Owing to suitable dimensioning of the cone or apex cone angle it is possible to prevent the inclusion of air between the external cable conductor and the cabledielectric. This type of radial clamping is particularly important owing to the flexibility of the braided metal casing in the case of cables, which are provided with a braided external conductor. The invention can, however, also be. employed with plug connectors which are to be fixed on a cable with a smooth casing or a corrugated casing.

The invention makes it possible to achieve a permanently gas-and water-tight connection.

The clamping ring is provided in accordance with one form of the invention with a sleeve shoulder, which can be inserted by sliding between the external cable conductor and the plastic protective casing and is hooked in the latter by means of a collar-like retaining hook. The radial pressure on the external plastic casing at this position is brought about by means of a seal, which is mounted in an internal groove of the pressure transmitting sleeve.

In accordance with another embodiment of the invention, which can more particularly be used in those cases when it is important to ensure a short construetional length of the plug connector or of .the plug connector fixing means, the clamping ring is constructed in a C-shaped manner, and the outer cable conductor end is crimped onto the end of the one limb and is supported via an intermediate ring having an L-shaped cross-section on the end contact annular surface of the.

plug connector head.

LIST OF SEVERAL VIEWS OF DRAWINGS In what follows embodiments of the invention will b described with reference to the drawings.

FIG. 1 shows -a sectional view of a coaxial plug connector fixed on a coaxial cable with a braided external conductor. 1

FIG. 2 shows a sectional view of a plug connector with a modified construction of the clamping ring for reducing the overall constructional length.

DESCRIPTION OF PREFERRED EMBODIMENTS Inaccordance with the embodiments of the invention shown the cable, on whichthe plug connector is to be mounted, hasan internal cable conductor 10, an external cable conductor 12 in the form of braided material, a cable dielectric 14 between the internal and external conductors and a plastic casing 16 surrounding the external conductor 12. The front end 18 of the external cable conductor is laid around the front end of a clamping ring 20, which has a through slot or slit (see the lower half of the sectional view in accordance with ing ring, which is preferably constructed in accordance with the principles of the German Pat. No. 1,440,186, has a sleeve extension 22 inserted between the external cable conductor l2 and the plastic casing 16. Its end has a collar 24 constructed in the manner of a retaining hook. buried inthe plastic casing 16. The clamping ring 20 possesses a conical surface 26 which rests against a correspondingly conically shaped annular surface 28 of a pressure transmitting ring 30, which in the rear part rests axially against a nut 32 with an internal shoulder. This nut is screwed on an external thread of the plug connector head 34. The conical or apex angle of the surfaces 26, 28 is so selected that the clamping ring is firstly closed and then radially pressed against the external cable conductor 12 and presses the latter against the cable dielectric while avoiding the trapping of air. The end annular surface, making contact with the turnedover end 18 of the external conductor, of the plug connector head 34 has a conical shoulder 36 which is so shaped that the annular gap produced by the rounding of the crimped-over part, between the rounded crimped part of the external conductor and the cable dielectric is substantially filled out.

The pressure transmitting ring has a surrounding external groove with an inserted sealing ring 38, which brings about a sealing contact with the plug connector head 34. An internal groove lying further to the rear of the pressure transmitting ring accepts a sealing ring 40, which produces a sealing pressure against the cable protective casing 16. This ring 40 lies behind the toothlike edge 24 on the outside so that a water-tight sealing action is ensured.

The embodiment of the invention in accordance with FIG. 2 differs from the embodiment in accordance with FlG. l in essence with respect to the construction of the clamping ring. In order to shorten the overall constructional length, the clamping ring 120 in accordance with FIG. 2 has a generally C-shaped form; over the one limb end 122 the end 18 of the external conductor 12 is crimped. In this case the plug connector head does not rest directly against this crimped-over part 18 and instead an intermediate ring 124 rests against it. The conical front end of this ring 124 has the other limb 126 of the pressing ring 120, which is C-shaped in cross-section, crimped onto it. This intermediate ring 124 has one contact surface 128 resting against the end contact annular surface of the plug connector head 34.

In accordance with a further development of the invention, which is not shown in the drawing, plate springs or Belville washers could be arranged between the nut 32 with an internal shoulder and the pressure transmission ring 30 in order to provide for a predetermined biasing in an axial direction. This biasing action would be permanently maintained. A certain axial clamping action can be obtained simply by the pressure transmitting ring, because the latter has a meandering cross-sectional shape which ensures satisfactory elasticity in the longitudinal direction.

I claim:

1. An HF coaxial conductor clamping assembly comprising:

a coaxial cable with an internal conductor, an external conductor surrounding said internal conductor and a dielectric layer therebetween;

a clamping ring extending annularly around said external conductor and having an end with an end face over which said external conductor is crimped;

an annular plug connector positioned in opposed relationship to said clamping ring end; said plug connector having an end contact annular surface positioned such that said clamping ring end face clamps said external conductor against said annular surface for making electric contact;

a nut having a shoulder facing toward said plug con nector annular surface; said clamping ring being between said nut shoulder and said end contact annular surface and said shoulder being spaced from said clamping ring; means on said nut for screwing it onto said plug connector and for tightening said nut toward said plug connector end contact annular surface;

a pressure transmitting sleeve extending annularly around said external conductor and interposed between said clamping ring and said nut shoulder, such that tightening of said nut presses said sleeve against said clamping ring to clamp said external conductor;

said sleeve and said clamping ring having cooperating, engaging and matingly tapered annular surfaces that are angled to force said clamping ring radially inwardly against said external conductor.

2. The assembly of claim 1, further comprising:

said plug connector end annular surface having a radially inner end adjacent to said external conductor and which is conically shaped to define a second shoulder; said external conductor crimped part and said clamping ring end face are rounded, thereby to cooperatively engage said second shoulder.

3. The assembly of claim 2, wherein said clamping ring has a sleeve part extending along said cable and toward said nut; an insulating layer located outside of and extending around said external conductor; said sleeve part of said clamping ring extending between said insulating layer and said external conductor.

4. The assembly of claim 3, wherein said pressure transmitting sleeve has an interior side facing toward said insulating layer; said pressure transmitting sleeve interior side having an interior annular groove formed therein; an interior sealing ring in said interior annular groove for sealing said pressure transmitting sleeve against said insulating layer;

said sleeve part having an exterior surface with a ra dially outwardly projecting collar thereon, and that said collar is so positioned as to engage said insulating layer at the side of said interior sealing ring that is closer to said nut.

S. The assembly of claim 1, wherein said pressure transmitting sleeve has an interior side facing toward said cable; said pressure transmitting sleeve interior side having an interior annular groove formed therein; an interior sealing ring in said interior annular groove for sealing said pressure transmitting sleeve against said cable.

6. The assembly of claim 5, wherein said pressure transmitting sleeve has an exterior side and in said pressure transmitting sleeve exterior side is formed an exterior annular groove; an exterior sealing ring in said extcrior annular groove for sealing said pressure transmitting sleeve against said plug connector.

7. An HF coaxial conductor clamping assembly comprising:

a coaxial cable with an internal conductor, an external conductor surrounding said internal conductor and a dielectric layer therebetween;

a clamping ring extending annularly around said external conductor and having an end with an end face over which said external conductor is crimped;

an annular plug connector positioned in opposed relationship to said clamping ring end; said plug connector having an end contact annular surface positioned such that said clamping ring end face clamps said external conductor against said annular surface for making electric contact;

a nut having a shoulder facing toward said plug connector annular surface; said clamping ring being between said nut shoulder and said end contact annular surface and said shoulder being spaced from said clamping ring; means on said nut for screwing it onto said plug connector and for tightening said nut toward said plug connector end contact annular surface;

a pressure transmitting sleeve extending annularly around said external conductor and interposed between said clamping ring and said nut shoulder, such that tightening of said nut presses said sleeve against said clamping ring to clamp said external conductor;

said sleeve and said clamping ring having cooperating, engaging and annular surfaces;

said clamping ring extending annularly around said external conductor and also wraps around that end of said external conductor where it is crimped over said clamping ring; said clamping ring being curvedly shaped to extend away from said nut and toward said plug connector such that said clamping ring has a C-shaped cross-section, with the end of said external conductor extending into the curve of said C-shape;

an intermediate ring, annularly extending around said external conductor and having an L-shaped cross-section, with one leg of the L extending into the curve of said C-shape; said intermediate ring one leg having one surface lying against the crimped over end of said external conductor and having an opposite surface to said one surface that lies against said clamping ring;

said intermediate ring also serving as part of said plug connector in that said plug connector end contact annular surface is part of said intermediate ring and said intermediate ring L-shape having another leg on which that said surface is included.

8. The assembly of claim 7, wherein said intermediate ring L-shape has an inner side inside the L and an outer side outside the L; said clamping ring being crimped over said outer side of said intermediate ring and over the bend of the L-shape of that said ring, in order to connect said clamping ring and said intermediate ring together.

Claims (8)

1. An HF coaxial conductor clamping assembly comprising: a coaxial cable with an internal conductor, an external conductor surrounding said internal conductor and a dielectric layer therebetween; a clamping ring extending annularly around said external conductor and having an end with an end face over which said external conductor is crimped; an annular plug connector positioned in opposed relationship to said clamping ring end; said plug connector having an end contact annular surface positioned such that said clamping ring end face clamps said external conductor against said annular surface for making electric contact; a nut having a shoulder facing toward said plug connector annular surface; said clamping ring being between said nut shoulder and said end contact annular surface and said shoulder being spaced from said clamping ring; means on said nut for screwing it onto said plug connector and for tightening said nut toward said plug connector end contact annular surface; a pressure transmitting sleeve extending annularly around said external conductor and interposed between said clamping ring and said nut shoulder, such that tightening of said nut presses said sleeve against said clamping ring to clamp said external conductor; said sleeve and said clamping ring having cooperating, engaging and matingly tapered annuLar surfaces that are angled to force said clamping ring radially inwardly against said external conductor.
2. The assembly of claim 1, further comprising: said plug connector end annular surface having a radially inner end adjacent to said external conductor and which is conically shaped to define a second shoulder; said external conductor crimped part and said clamping ring end face are rounded, thereby to cooperatively engage said second shoulder.
3. The assembly of claim 2, wherein said clamping ring has a sleeve part extending along said cable and toward said nut; an insulating layer located outside of and extending around said external conductor; said sleeve part of said clamping ring extending between said insulating layer and said external conductor.
4. The assembly of claim 3, wherein said pressure transmitting sleeve has an interior side facing toward said insulating layer; said pressure transmitting sleeve interior side having an interior annular groove formed therein; an interior sealing ring in said interior annular groove for sealing said pressure transmitting sleeve against said insulating layer; said sleeve part having an exterior surface with a radially outwardly projecting collar thereon, and that said collar is so positioned as to engage said insulating layer at the side of said interior sealing ring that is closer to said nut.
5. The assembly of claim 1, wherein said pressure transmitting sleeve has an interior side facing toward said cable; said pressure transmitting sleeve interior side having an interior annular groove formed therein; an interior sealing ring in said interior annular groove for sealing said pressure transmitting sleeve against said cable.
6. The assembly of claim 5, wherein said pressure transmitting sleeve has an exterior side and in said pressure transmitting sleeve exterior side is formed an exterior annular groove; an exterior sealing ring in said exterior annular groove for sealing said pressure transmitting sleeve against said plug connector.
7. An HF coaxial conductor clamping assembly comprising: a coaxial cable with an internal conductor, an external conductor surrounding said internal conductor and a dielectric layer therebetween; a clamping ring extending annularly around said external conductor and having an end with an end face over which said external conductor is crimped; an annular plug connector positioned in opposed relationship to said clamping ring end; said plug connector having an end contact annular surface positioned such that said clamping ring end face clamps said external conductor against said annular surface for making electric contact; a nut having a shoulder facing toward said plug connector annular surface; said clamping ring being between said nut shoulder and said end contact annular surface and said shoulder being spaced from said clamping ring; means on said nut for screwing it onto said plug connector and for tightening said nut toward said plug connector end contact annular surface; a pressure transmitting sleeve extending annularly around said external conductor and interposed between said clamping ring and said nut shoulder, such that tightening of said nut presses said sleeve against said clamping ring to clamp said external conductor; said sleeve and said clamping ring having cooperating, engaging and annular surfaces; said clamping ring extending annularly around said external conductor and also wraps around that end of said external conductor where it is crimped over said clamping ring; said clamping ring being curvedly shaped to extend away from said nut and toward said plug connector such that said clamping ring has a C-shaped cross-section, with the end of said external conductor extending into the curve of said C-shape; an intermediate ring, annularly extending around said external conductor and having an L-shaped cross-section, with one leg of the L extending into the curve of said C-shape; said intermediate rIng one leg having one surface lying against the crimped over end of said external conductor and having an opposite surface to said one surface that lies against said clamping ring; said intermediate ring also serving as part of said plug connector in that said plug connector end contact annular surface is part of said intermediate ring and said intermediate ring L-shape having another leg on which that said surface is included.
8. The assembly of claim 7, wherein said intermediate ring L-shape has an inner side inside the L and an outer side outside the L; said clamping ring being crimped over said outer side of said intermediate ring and over the bend of the L-shape of that said ring, in order to connect said clamping ring and said intermediate ring together.
US42390873 1972-12-12 1973-12-12 HF coaxial plug connector Expired - Lifetime US3907399A (en)

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DE2260734A1 (en) 1974-06-20
DE2260734C3 (en) 1984-09-20

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