US3686623A - Coaxial cable connector plug - Google Patents

Coaxial cable connector plug Download PDF

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Publication number
US3686623A
US3686623A US3686623DA US3686623A US 3686623 A US3686623 A US 3686623A US 3686623D A US3686623D A US 3686623DA US 3686623 A US3686623 A US 3686623A
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Prior art keywords
members
cable
conductor
coaxial cable
gripping means
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John P Nijman
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Amphenol Corp
Bunker Ramo Corp
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Bunker Ramo Corp
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    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01RLINE CONNECTORS; CURRENT COLLECTORS
    • H01R9/00Connectors and connecting arrangements providing a plurality of mutually insulated connections; Terminals or binding posts mounted upon a base or in a case; Terminal strips; Terminal blocks
    • 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
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01RLINE CONNECTORS; CURRENT COLLECTORS
    • H01R4/00Electrically-conductive connections between two or more conductive members in direct contact and means for effecting or maintaining such contact
    • H01R4/28Clamped connections, spring connections
    • H01R4/50Clamped connections, spring connections utilising a cam, wedge, cone or ball also combined with a screw
    • H01R4/52Clamped connections, spring connections utilising a cam, wedge, cone or ball also combined with a screw which is spring loaded

Abstract

A coaxial cable connector plug including cooperatively engageable members threadably connected together and having contacts which are cammed inwardly into gripping relation with respective outer and center contacts of a coaxial cable in response to relative movement of the members in a securing direction. The connector also provides for different camming actions at different engagement positions of the members for preventing damage from overtightening and for preventing unwanted turning of the coaxial cable during tightening. The connector is further constructed so as to prevent its internal elements from falling out when the members are fully disengaged.

Description

United States Patent Nijman [54] COAXIAL CABLE CONNECTOR PLUG [72] Inventor: John P. Niiman, Scarborough, On-

tario, Canada [73] Assignee: The Bunker-Ramo Corporation,

Oak Brooke, Ill.

22 Filed: Nov. 13, 1969 21 Appl.No.: 876,542

[30] Foreign Application Priority Data Nov. 26, 1968 Canada ..O36,207

[52] US. Cl. ..339/177 E, 339/273 S [51] Int. Cl. ..H01r 17/04 [58] Field of Search...339/177 R, 177 E, 95 R, 95 A, 339/95 D, 273

[56] References Cited UNITED STATES PATENTS 3,501,737 3/1970 Harris et a1. ..339/177 R 3,291,895 12/1966 Van Dyke ..l74/88 3,292,136 12/1966 Somerset ..339/177 3,300,752 1/1967 Benoit et a1. ..339/253 \I 1}}??ssxNV', t [I28 I, I! 75: i ll I o /,;,;4m,$l= r))- as\\\ f 34 //6 [15] 3,686,623 [451 Aug. 22, 1972 3,343,122 9/1967 Drogo ..3.39/177 FOREIGN PATENTS OR APPLICATIONS 1,242,731 6/1967 Germany ..339/177 R 1,470,206 1/1967 France ..339/177 Primary Examiner-Marvin A. Champion Assistant Examiner-Lawrence .l. Staab Attorney-Frederick M. Arbuckle ABSTRACT A coaxial cable connector plug including cooperatively engageable members threadably connected together and having contacts which are cammed inwardly into gripping relation with respective outer and center contacts of a coaxial cable in response to relative movement of the members in a securing direction. The connector also provides for different camming actions at different engagement positions of the members for preventing damage from overtightening and for preventing unwanted turning of the coaxial cable during tightening. The connector is further constructed so as to prevent its internal elements from falling out when the members are fully disengaged.

3 Claims, 6 Drawing Figures Patented Aug. 22, 1972 3,686,623

2 Sheets-Sheet 2 FIG. 6

INVENTOR.

JOHN P N/JMAN ATTY.

COAXIAL CABLE CONNECTOR PLUG BACKGROUND OF THE INVENTION The present invention relates to a coaxial cable connector plug of the kind most generally used in connecting a coaxial cable in an amplifier chassis, as in a CATV system. The chassis ordinarily includes a unit involving a pressure different from that of atmosphere, i.e., it is either vacuumized or pressurized. The connector plug includes a pair of mating parts, one of the parts being mounted directly to the amplifier chassis unit and having contacts operatively engaging elements within the unit. The other mating part is a cap fitted on the body, and the two parts receive the coaxial cable, and when the parts are securely interconnected, electrical engagement is made between the conductor of the cable with the elements within the amplifier chassis unit. The cap may be applied to and removed from the body a number of times as in checking the effectiveness of the cable connection. In removing the cap from the body, the amplifier chassis unit is to remain sealed and the cable is to be effectively connected after each disconnection.

OBJECTS AND SUMMARY OF THE INVENTION A broad object of the invention is to provide a novel connector plug of the foregoing general character capable of producing advantages not possible heretofore.

Another broad object is to provide a connector plug of the foregoing general character having novel construction particularly operative for producing effective electrical connection with the conductors of the cable.

Another object is to provide a connector plug of the foregoing character including mating parts which are turned up into connected position wherein in the turning operation the cable is effectively prevented from twisting, or turning with either of the connector parts.

Another and important object is to provide a connector plug of the foregoing general character in which the mating parts have interengageable stops establishing positive limitation of the turning up movement, and which is so constructed as to prevent damage to the cable if the tolerances of the various parts or elements are such as would otherwise tend to produce overtightening.

Still another object is to provide a connector plug of the foregoing character which is particularly effective in sealing the interior of the amplifier chassis unit to which it is connected, in all conditions of the connector plug, whether the cable is connected therein or removed therefrom.

An additional object is to provide a connector plug of the foregoing character which is of rugged construc tion and, in addition to providing effective electrical connection as referred to, provides a connection of the cable that is of unusually great mechanical strength resisting forces tending to pull the cable from the connector plug or to pull apart the parts thereof.

More specifically, another object is to provide an electrical connector for connecting a coaxial cable of the type having an outer sheath conductor and a central conductor in an installation in which it is subjected to severe forces tending to displace it, such as occurring in servicing, and from thermal expansions and contractions, as well as weight loading.

A still more specific object is to provide a connector of the foregoing general character including a body and a cap receiving the coaxial cable, and in the use of which the simple movement of tightening of the unit on the body provides good and effective electrical connection of both the central conductor and the outer sheath conductor and secures both conductors, individually against displacement by external forces, and further maintains securement relative to good electrical transmission characteristics.

A still further object is to provide a connector plug of the character referred to, having novel construction wherein, when the cap is removed from the body, all of the internal elements are prevented from accidentally falling out, thereby facilitating the work of the field man in servicing installations.

In the drawings:

FIG. 1 is a semi-diagrammatic view of an amplifier chassis unit and a cable connected thereto, utilizing a connector plug according to the present invention;

FIG. 2 is an expanded view showing interacting main parts of the connector plug unassembled and a cable to be connected therein;

FIG. 3 is a large scale longitudinal, axial, sectional view of the connector plug in connected position, with the parts at the beginning of the assembled and tightening up step;

FIG. 4 is a view similar to FIG. 3 but in a first stage of tightening;

FIG. 5 is a view similar to FIGS. 3 and 4 but with parts in position assumed in a normally tightened and fully assembled condition; and

FIG. 6 is a view similar to FIGS. 3, 4, and 5 with the main parts of the connector plug in tightened position, with the stops in interengagement, but with certain elements in an overtightened position.

Referring in detail to the drawings, FIG. 1 shows an amplifier chassis unit 10 of known kind having a number of electronic components 12 therein. The unit 10 includes a casing 14 having one wall element 16 in which is mounted a connector plug 18 embodying the features of the present invention. The interior of the unit 10 normally is of a pressure different from the atmospheric pressure, such as a partial vacuum.

The connector plug 18 includes two main interacting parts, namely, a body 20 and a cap 22 both of which will be described in detail hereinbelow. The connector plug is for use in connecting a coaxial cable 24 with the components 12 in the interior of the unit 10, this cable being of known kind, including a central conductor 26 such as of copper surrounded by a layer of dielectric material 28 preferably of cellular resilient material which is surrounded by an aluminum jacket 30 forming the outer conductor, concentric with the central conductor 26. The end of the dielectric material 28 and the aluminum jacket 30 together form a forwardly facing shoulder 32, and surrounding the jacket or conductor 30 is an outer layer of insulation or dielectric material 34.

The body 20 as shown in FIGS. 3-6 is of tubular shape having a central bore 35, an intermediate enlarged nut-like element 36, and a forward reduced portion 38 exteriorly threaded at 39 serving as the element by which the connector plug is mounted in the wall 16 of the unit 10. The element 36 has a forwardly facing shoulder 40 having an annular groove 42 receiving a gasket 44 for sealing the interior of the unit 10 from the exterior when the connector plug is applied thereto as in FIG. 1. At the opposite or rear end, the body has a reduced diameter portion 46 forming a shoulder 47 and externally threaded at 48 and having an inwardly directed flange 49 of minor radial dimension, forming a forwardly directed shoulder 50. The flange is provided with a forwardly converging generally inwardly directed camming or wedging surface 52. The body has a main forward portion 54 terminating forwardly at an internal shoulder 56. At the forward end is an insert 58 molded in position therein and in which is embedded a contact 60, this contact having a forward finger member 62 which extends into the interior of the unit 10 and a rearwardly extending or interiorly positioned finger member 64 having a tubular portion 66 split or slotted as indicated at 68 forming finger elements 70 which are provided with internal serrations 72, the finger elements 70 serving as a chuck for gripping or seizing the central conductor of the cable, as referred to again hereinbelow. The finger elements 70 are shaped at their rear end to provide a rearwardly converging, external conical camming or wedging surface Surrounding the rear end of the finger member 64 is a clamping insulator 76 of suitable insulating or dielectric material resistant to cold flow, having a central bore 78 therethrough including a forwardly disposed forwardly diverging conical camming or wedging surface 80 engageable with the surface 74, and preferably a rearwardly diverging entry opening 81. The clamping insulator 76 includes an external peripheral flange 82 engageable with the shoulder 50, and a rearwardly extending reduced central boss 84.

A compression spring 86 is disposed in the bore 35 in surrounding relation to the finger member 64 and compressed between the shoulder 56 and the clamping insulator 76.

The cap 22 is also of tubular form having a central bore indicated in its entirety at 88 and including a rearmost segment 90 leading into an enlarged segment 92 forming a forwardly facing shoulder 94 therebetween. Forwardly of the segment 92 is another segment or counter bore 95 forming a forwardly facing shoulder 96, the segment 95 being provided with a groove 98 in which is a split retaining ring 100. The segment 95 leads into another larger segment 102 having a circumferential groove 104 in which is disposed an ring or gasket 106. Forwardly of the groove 104 are internal threads 108 threadedly engaging the external threads 48 on the body. The end surface 1 and the shoulder 47 on the body form stop means for positively limiting relative movement between the cap and body member in a manner referred to again hereinbelow.

Mounted in the cap is an O ring gasket 112 engageable with the shoulder 94, forwardly of and engageable with which is a thrust ring 114 having a rearwardly facing external shoulder 116 engageable with the shoulder 96, and forwardly of that shoulder an annular generally axially extending flange 118, adapted to ride or slide freely in the bore segment 95. The particular shape and proportions of this thrust ring are of importance in the principles of the invention, as will be described hereinbelow. The thrust ring is preferably made separate from the cap proper, to facilitate its fabrication and to facilitate incorporation of the O ring 1 12 in the cap. The flange 1 18 has a foremost, forwardly diverging, generally inwardly directed conical camming or wedging surface 120 having a small end indicated by a point or line 120a, rearwardly of which is another internal surface 122, also tapered, but of much lesser taper than the surface 120. For example, the surface 120 is preferably in the neighborhood of 45 to the central axis and the surface 122 is on the order of 7 to that axis. These inclinations are not critical and a reasonable latitude is permitted relative thereto.

Contained within the cap is a ferrule 124, split as indicated at 126 and thus capable of radial contraction and expansion. The ferrule is provided with internal circumferential serrations 128 which may be spiral as in the form of threads, or in the form of individual and disconnected teeth. At the rear end of the ferrule is an external, forwardly diverging conical camming or wedging surface 130 having a small end indicated by the point or line 130a, and engageable with the camming surface 120 and preferably of similar inclination, i.e., 45 to the central axis. Forwardly of the surface 130 is a surface 131 which may be cylindrical or tapered to a degree similar to that of the surface 122 and engageable with that surface. The ferrule has an external circumferential groove 132, forming oppositely facing shoulders 134, 136 engageable with the retaining ring for retaining the ferrule in the cap when the cap is removed from the body.

The ferrule at its forward end has an external, forwardly converging conical camming or wedging surface 138 of an inclination similar to the surface 52, and engageable therewith, the inclination of these surfaces being substantially less than the surfaces 130, 120, i.e., substantially less than 45. The inclination of the surfaces 138, 52 is not critical and may vary within a substantial range, so long as they remain substantially less than the inclination of the surfaces 130, 120. Rearwardly of the surface 138, the external surface of the ferrule, as indicated at 140, may approach the cylindrical. At the forward end of the ferrule is an inturned flange 142 defining an opening 144 which may approach the cylindrical and is dimensioned for freely receiving the boss 84 on the clamping insulator 76.

in the use of the connector plug, the body 20 is mounted to the unit 10 in a known manner. The end of the cable 24 is then stripped as shown in FIG. 2 and inserted forwardly into the cap 22 from left to right, as indicated above in reference to forward, rearward, etc. It is so inserted until the aluminum jacket 30 at the shoulder 32 engages the flange 142, the ferrule 124 at that time being free of the thrust ring 114 and in expanded condition, enabling free movement of the cable thereinto.

The plurality of connector parts, as thus far described, are assembled by applying the cap 22 to the body 20 and turning the cap thereon via the threads 48 and 108. As the cap is moved along the body, the camming surface engages the camming surface (FIG. 3), and moves the ferrule 124 forwardly, and in this movement the camming surface 138 engages the camming surface 52, and because of the lesser inclination of the latter two surfaces, relative to the surfaces 120, 130, the forward end of the ferrule is immediately The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows:

1. In a connector plug for use with a coaxial cable having a center conductor and an outer conductor, the combination of:

first and second members constructed and arranged for cooperative engagement and relative movement, said members being of generally tubular form for receiving the cable,

central contact means disposed within a member for electrically engaging the center conductor of the cable,

outer contact means disposed within a member for electricflly engaging the outer conductor of the cable,

at least one of said contact means including contractible gripping means, and

camming means coupled to at least one of said members and engageable with said gripping means to contract it and thereby to grip its respective conductor in response to relative movement of said members in a securing direction,

said camming means including a part having tapered surfaces engaging with said gripping means, said surfaces being of relatively rapid taper in the area of initial engagement, and of relatively slight taper in an area reached upon further engagement.

2. The invention in accordance with claim 1,

wherein said members have interengaging means limiting relative movement thereof in a securing direction, and

cable having a center conductor, an outer conductor coaxial therewith and spaced therefrom by an insulating layer, and a fore end portion of the central conductor extending beyond the insulating layer and spaced 10 away from the end of the outer conductor; the connector comprising first gripping means adapted to receive and grip the end portion of the outer conductor and a second gripping means adapted to receive and grip the center conductor of the cable,

a single pair of relatively movable housing members screw threaded to each other, and

means responsive to the relative axial tightening movement of said threaded housing members with respect to each other causing contraction of both said first and second gripping means on the exterior conductor and on the center conductor of the cable respectively,

said first gripping means comprising a split ferrule, said ferrule having wedging surfaces of difierent inclination at opposite ends thereof, whereby axial closure movement of said housing members initially causes contraction of one end of said ferrule, and further axial closure movement causes contraction of the other end of said ferrule.

Dedicatien 3,686,623.J0hn P. Nz'jmcm, Scarborough, Ontario, Canada. COAXIAL CABLE CONNECTOR PLUG. Patent dated Aug. 22, 1972. Dedication filed Mar. 14, 1977, by the assignee, Bunker Rama Gowpomtion. Hereby dedicate-s to the Public the entire term of said patent.

[Oficz'al Gazette June '7, 1.977.]

Claims (3)

1. In a connector plug for use with a coaxial cable having a center conductor and an outer conductor, the combination of: first and second members constructed and arranged for cooperative engagement and relative movement, said members being of generally tubular form for receiving the cable, central contact means disposed within a member for electrically engaging the center conductor of the cable, outer contact means disposed within a member for electrically engaging the outer conductor of the cable, at least one of said contact means including contractible gripping means, and camming means coupled to at least one of said members and engageable with said gripping means to contract it and thereby to grip its respective conductor in response to relative movement of said members in a securing direction, said camming means including a part having tapered surfaces engaging with said gripping means, said surfaces being of relatively rapid taper in the area of initial engagement, and of relatively slight taper in an area reached upon further engagement.
2. The invention in accordance with claim 1, wherein said members have interengaging means limiting relative movement thereof in a securing direction, and wherein said camming surfaces are located so as to prevent damage from excessive camming action in the event overtightening occurs as a result of tolerance variations.
3. In a connector for use with a coaxial cable, the cable having a center conductor, an outer conductor coaxial therewith and spaced therefrom by an insulating layer, and a fore end portion of the central conductor extending beyond the insulating layer and spaced away from the end of the outer conductor; the connector comprising first gripping means adapted to receive and grip the end portion of the outer conductor and a second gripping means adapted to receive and grip the center conductor of the cable, a single pair of relatively movable housing members screw threaded to each other, and means responsive to the relative axial tightening movement of said threaded housing members with respect to each other causing contraction of both said first and second gripping means on the exterior conductor and on the center conductor of the cable respectively, said first gripping means comprising a split ferrule, said ferrule having wedging surfaces of different inclination at opposite ends thereof, whereby axial closure movement of said housing members initially causes contraction of one end of said ferrule, and further axial closure movement causes contraction of the other end of said ferrule.
US3686623A 1968-11-26 1969-11-13 Coaxial cable connector plug Expired - Lifetime US3686623A (en)

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Also Published As

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DE1958357A1 (en) 1970-06-04 application
GB1289312A (en) 1972-09-13 application
JPS523477B1 (en) 1977-01-28 grant

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