1. Field of the Invention
This invention relates to connectors for elongate cables and, more particularly, to a connector assembly through which a connector on the connector assembly is placed in electrical contact with a radially inwardly facing conductive surface on the cable.
2. Background Art
Larger sizes of coaxial cable are commonly made with hollow center conductors. The center conductors may be formed as thin walled tubes and commonly have annular corrugations thereon to facilitate bending. By reason of including the corrugations, it may be difficult to establish a reliable electrical contact with the radially inwardly facing conductive surface on the center conductor. Positive maintenance of this electrical contact is critical to establishing a high integrity connection between a connector, such as a pin connector, and the center conductor. This has prompted the development of a number of alternative designs for connector assemblies, amongst which is that which uses a dart-tipped, or barbed, probe that is forcibly directed into the center conductor at the cable end. To be effective, this type of connection generally requires deformation of the center conductor and the maintenance of a constant holding force. This holding force may, due to environmental variations, such as temperature changes, and other changed conditions, relax over the anticipated useful life of the connector assembly.
In another form, the connector assembly has a flexible, slotted tube that is inserted within the center conductor. The slots separate the tube to define discrete fingers that are urged against the radially inwardly facing conductive surface. By using a thicker wall on these tubes, positive holding forces can be developed between the tube fingers and center conductor, at the cost of limiting compliance of the tubes/fingers to the radially inwardly facing, conductive, center conductor surface. This is particularly true where the radially inwardly facing, conductive, center conductor surface is corrugated.
The latter problem can be eliminated to a certain extent by making the tube/fingers more flexible and compliant to irregular surfaces. However, by doing so, the holding forces, resulting from the residual forces in the “loaded” fingers, may be relatively weak, and prone to diminishing further over time.
The industry continues to seek out connecting structures at these sites that establish good contact to maximize electrical transmission properties, while at the same time maintaining a secure and positive connection over the anticipated useful life of the product.
In one form, the invention is directed to the combination of an elongate cable and a connector assembly. The elongate cable has a central axis and a receptacle with a radially inwardly facing conductive surface. The connector assembly has a body with a central axis. The body has an insert portion with a wall having a radially inwardly facing surface and a radially outwardly facing conductive surface. A first connector is in electrical contact with the radially outwardly facing conductive surface on the wall. The insert portion is extended into the receptacle on the cable. A biasing assembly is configured to produce a resilient radial force on the wall of the connector assembly so as to maintain the radially outwardly facing conductive surface of the wall in electrical contract with the radially inwardly facing conductive surface of the elongate cable to thereby maintain a conductive path between the radially inwardly facing conductive surface on the elongate cable and the first connector.
In one form, the elongate cable is a coaxial cable with a center conductor defining the radially inwardly facing conductive surface.
In one form, the wall extends around the central axis of the body so as to define diametrically opposite wall portions. The biasing assembly is configured to produce a biasing force between the diametrically opposite wall portions.
The biasing assembly may be in the form of a resilient component.
In one form, the resilient component has a body with a cylindrical portion that engages the diametrically opposite wall portions.
In one form, the body has a discrete finger that is deflectable in a radial direction, with the biasing assembly in the form of a component that is in axial coincidence with the discrete finger and configured to exert a radial outward force on the discrete finger.
In one form, the body has a base portion and the discrete finger is connected to, and projects in cantilever fashion from, the base portion.
In one form, the body has axially spaced, annular corrugations.
In one form, at least one of the axially spaced, annular corrugations is provided on the discrete arm.
In one form, the body has a plurality of discrete fingers that are deflectable in a radial direction. The fingers are spaced around the central axis of the body and cooperatively define a cylindrical shape. The biasing assembly is configured to produce a radial force on a plurality of the discrete fingers.
In one form, the discrete fingers are each connected to and project from, the base portion.
In one form, the biasing assembly is in the form of a resilient component with a cylindrical portion. The cylindrical portion engages a plurality of the discrete fingers within the receptacle.
In one form, the resilient component has a spherical shape.
The first connector may be a pin connector.
In one form, the wall extends around a space. The biasing assembly is in the form of a component with a first portion that resides within the space and a sealing portion that is spaced axially from the first portion. The sealing portion seals against the radially inwardly facing conductive surface.
In one form, the radially inwardly facing conductive surface may have at least one annular corrugation.
The radially inwardly facing conductive surface may have a plurality of axially spaced corrugations, with the sealing portion having a plurality of axially spaced, annular projections that are complementary to the shape of the radially inwardly facing conductive surface.
In one form, the connector assembly is formed as one piece.
Alternatively, the connector assembly may be made from a plurality of parts that are operatively engaged and maintained in operative relationship by moving the plurality of parts axially, one relative to the other.
The above structure may be further provided in combination with a second connector assembly having a second connector that is coaxial with and surrounds the first connector.
The above structure may be further provided in combination with a connector fitting with threads configured to maintain the first and second connector assemblies operatively connected to a port with threads complementary to the threads on the connector fitting.
The elongate cable may have a corrugated, annular, conductive surface that is in electrical contact with the second connector.
In one form, the biasing assembly has a resilient component made from a compressible material and that is separate from and attached to, and maintained upon, the body without requiring use of separate fasteners.
The invention is further directed to the combination of an elongate cable and a connector assembly. The elongate cable has a central axis and a receptacle with a radially inwardly facing conductive surface. The connector assembly has a body with an insert portion with a wall having a radially inwardly facing surface and a radially outwardly facing conductive surface, and a first connector in electrical contact with the radially outwardly facing conductive surface on the wall. The insert portion extends into the receptacle. Resilient biasing structure is provided within the receptacle for producing a radial force on the wall so as to maintain the radially outwardly facing conductive surface of the wall in electrical contact with the radially inwardly facing conductive surface on the elongate cable to thereby maintain a conductive path between the radially inwardly facing conductive surface on the elongate cable and the first connector.
In one form, the resilient biasing structure is in the form of a resilient biasing component made from a compressible material and that has at least a portion that is at least one of: a) cylindrical; and b) spherical with a central axis that is coaxial with the central axis of the body.
In one form, the body has discrete structure on the wall deflecting radially outwardly under a force produced by the resilient biasing structure for maintaining the radially outwardly facing conductive surface in electrical contact with the radially inwardly facing conductive surface on the elongate cable.
In one form, the resilient component is separate from, and attached to, and maintained upon, the body without requiring use of separate fasteners.
The invention is further directed to a connector assembly for a coaxial cable having a hollow center conductor with a central axis and defining a receptacle. The connector assembly has a body having a central axis and including an insert portion with a wall having a radially inwardly facing surface and a radially outwardly facing conductive surface, and a first connector in electrical contact with the radially outwardly facing conductive surface on the wall. The insert portion is configured to be extended into the receptacle on the center conductor on the coaxial cable. A biasing assembly is configured to produce a resilient, radial force on the wall so as to maintain the radially outwardly facing conductive surface of the wall in electrical contact with a radially inwardly facing conductive surface on the hollow center conductor on the coaxial cable to thereby maintain a conductive path between the radially inwardly facing conductor surface on the hollow center conductor on the coaxial cable and the first connector.
In one form, the biasing assembly comprises a resilient component that is separate from, and attached to, and maintained upon, the body without requiring use of separate fasteners.
The biasing assembly may be in the form of a resilient component made from a compressible material.
The resilient compound may have at least a portion that is at least one of: a) cylindrical; and b) spherical.
The invention is further directed to a method of operatively assembling a connector assembly to an elongate cable having a central axis and a receptacle with a radially inwardly facing conductive surface. The method includes the step of providing a connector assembly having a body with a central axis and an insert portion with a wall having a radially inwardly facing surface and a radially outwardly facing conductive surface, and a first connector in electrical contact with the radially outwardly facing conductive surface on the wall. The invention further includes the steps of: providing a biasing component; extending the insert portion into the receptacle; and joining the connector assembly and biasing component by moving the connector assembly and biasing component axially, one relative to the other, so that: a) simply by reason of relatively axially moving the connector assembly and biasing component, the connector assembly and biasing component are maintained together without requiring any separate fastener; and b) the biasing component produces a resilient radial force on the wall so as to maintain the radially outwardly facing conductive surface of the wall in electrical contact with the radially inwardly facing conductive surface on the elongate cable to thereby maintain a conductive path between the radially inwardly facing conductive surface on the elongate cable and the first connector.
In one form, the step of providing a biasing component involves providing a biasing component that has at least a portion thereof that is shaped as one of: a) a cylinder; and b) a sphere with a central axis coaxial with the central axis of the body.
In
A biasing assembly 24 is configured to produce a resilient, radial force on at least a part of the wall 18 so as to maintain the radially outwardly facing conductive surface 20 on the wall 18 in electrical contact with the radially inwardly facing conductive surface 16 on the elongate cable 12, to thereby maintain a conductive path between the radially inwardly facing conductive surface on the elongate cable and the first connector 22.
The first connector 22 may be any type of connector, such as a pin connector, that is electrically connected to a component 26 on a port 28. The port 28 is intended to generically describe any “fitting”, whether a terminal fitting, a cable end fitting, etc., that can be placed in electrical contact with the radially inwardly facing conductive surface 16 on the elongate cable 12 through the first connector 22.
The combination 10 is shown in
Referring now to
The body 30 includes an annular base portion 42. The fingers 38 are connected to, and project in cantilever fashion from, the base portion 42. The lengths of the fingers 38 project generally parallel to the axis 32. The fingers 38 are equidistantly spaced from each other in a circumferential direction.
The body 30 has annular corrugations at 44 adjacent to a first axial end 46 of the body 30 where the fingers 38 connect to the base portion 42. The corrugations 44 are annular, axially spaced elements and, in this embodiment, consist of an annular ridge 48 between adjacent annular grooves 50, 51. At least one, and in this case a plurality, of the corrugations 144 are provided on the fingers 38. The corrugations 44 supplement the inherent flexibility of the fingers 38 to allow bending of the body 30 relative to the axis 32 and also facilitate flexing of the free ends 52 of the fingers 38, remote from the first axial end 46 of the body 30, in a radial direction, both inwardly and outwardly relative to the axis 32. Any number of corrugations 44 may be provided along the length of the body 30.
In the embodiment shown, the base portion 42 and fingers 38 are made as one piece from a thin sheet of formable, bendable, conductive material. The material is chosen so that with the configuration shown, the individuals fingers 38 can be conformed along substantial portions of the lengths thereof to the radially inwardly facing conductive surface 16 on the elongate cable 12, shown with a uniform diameter in
In the embodiment shown in
The body 38 can be configured so that the radially outwardly facing conductive surface 20, defined cooperatively by the fingers 38, has a diameter that is slightly greater than that of the radially inwardly facing conductive surface 16 on the elongate cable 12. By directing the insert portion 34 of the body 30 on the connector assembly 14 into the receptacle 15, axially in the direction of the arrow 69, the fingers 38 become slightly deformed radially inwardly so that there is a residual bias force urging the fingers 38 radially to against the radially inwardly facing conductive surface 16 on the elongate cable 16, to establish positive electrical contact therewith. To facilitate this introduction of the connector assembly 14 into the receptacle 15, the free ends 52 of the fingers 38 are slightly bent radially inwardly to cooperatively produce an inclined, annular guide surface 70. Aside from facilitating coaxial alignment between the generally cylindrical/annular receptacle 15 and the body 30, the guide surface 70 also progressively bends the fingers 38 during assembly to effect radial loading thereof.
As noted previously, in the Background portion herein, in the absence of any additional structure, the fingers 38, as described above, may lose some of their resilience or may become permanently deformed under the constant radial pressure imparted thereto by the annular conductive surface 16. This may cause a break in the electrical connection between the first connector 22 and cable 12.
According to the invention, the biasing assembly 24 avoids this condition to assure that positive electrical contact is maintained between the body 30 and the conductive surface 16 of the elongate cable 12, thereby to assure that a consistent conductive path is maintained between the elongate cable 12 and first connector 22. The biasing assembly 24, in one form, is shown to have a body 72 with a first portion 74 that resides within the space 40, and a sealing portion 76, formed integrally and preferably as one piece, with the first portion 74, and axially offset therefrom. The first portion 74 and sealing portion 76 are joined by a reduced diameter neck portion 78.
The biasing assembly 24 has a generally overall cylindrical shape 24 with a central axis 80 coincident with both the central axis 32 of the body 30 and the central axis of the elongate cable 12. The first portion 74 has a cylindrical portion 82 of substantially uniform diameter that conformingly nests within the space 40. The cylindrical portion 82 has a diameter that is chosen so that with the connector assembly 14 inserted within the receptacle 15, the cylindrical portion 82 of the body 72 produces a resilient, radial outward, bias force upon some, and preferably all, of the fingers 38, to maintain intimate contact between the radially outwardly facing conductive surface 20 on the body 30 and the radially inwardly facing conductive surface 16 on the elongate cable 12.
The first portion 74 may take a variety of different shapes. At a minimum, it is preferred that the first portion 74 be compressed between diametrically opposite wall portions/fingers 38 to produce a constant, radially opposite, outward force thereupon. Preferably, the parts are relatively configured so that upon directing the connector assembly 14 into the receptacle 15, the fingers 38 deform radially inwardly to compress the body 72. The residual forces therein produce the radial outward force on the fingers 38 on the connector assembly 14. Preferably, the residual forces in the body 72 urge all of the fingers 38 radially outwardly into electrical contact with the radially inwardly facing conductive surface 16, to thereby maintain a conductive path between the radially inwardly facing conductive surface 16 and the first connector 22 through the conductive body 30.
While the body 72 could be made from a substantially rigid material, it is preferred that it be resilient and compressible, such as from rubber, or other material that gives under the forces encountered during assembly and as the connector assembly 14 is bent. The body 72 thus serves as a resilient biasing means for producing a radial force on the wall 18 so as to maintain electrical contact between the radially outwardly facing conductive surface 20 of the wall 18 and the radially inwardly facing conductive surface 16 of the elongate cable 12. The fingers 38 in turn function as a discrete means on the wall 18 that deflect radially under a force produced by the body 72 within the receptacle 15 to maintain electrical contact between the surfaces 16, 20.
To facilitate assembly of the biasing assembly 24 and body 30, one axial end 84 of the first portion 74 has a truncated, conical shape, defining an inclined surface 86. By directing the biasing assembly 24 from right to left in exemplary
The sealing portion 76, which is optional, aside from facilitating grasping and manipulation of the biasing assembly 24 as during assembly/disassembly, serves also as a sealing component against the conductive surface 16 on the elongate cable 12. The sealing portion 76 has a generally cylindrical shape with axially alternating annular ribs 88 and grooves 90. The outer, radially outwardly facing annular surfaces 92 of the ribs 88 can be radially compressed and placed sealingly against the conductive surface 16 of the elongate cable 12. Alternatively, with the radially inwardly facing conductive surface 16′ in
With the described construction, the connector assembly 14 and biasing assembly 24 can be placed in operative relationship simply by moving the same from an axially separated state axially towards and against each other. The surface 86 progressively cams the free ends 52 of the fingers 38 away from each other to allow direction of the first portion 74 into the space 40, whereupon the finger free ends 52 spring back to releasably maintain the first portion 74 within the space 40. This connection is essentially a snap-fit connection that can be releasably maintained without the requirement of any separate fasteners. Thereafter, the preassembled connector assembly 14 and biasing assembly 24 can be moved as a unit axially, in the direction of the arrow 69, to extend the sealing portion 76 into the receptacle 15. This is facilitated by making the axial end 96 of the biasing assembly 24, opposite to the axial end 84, with a truncated conical shape with an angled guide surface 98. The guide surface 98 facilitates centering of the sealing portion 76 into coaxial relationship within the receptacle 15 and also permits progressive squeezing of the sealing portion 76 as it is extended into the receptacle 15. With the sealing portion 76 fully seated, an annular rib 100, with an annular sealing surface 102 having a greater axial extent than that of the surfaces 92, resides at least partially within the receptacle 15 to engage the conductive surface 16.
In
The configuration of the structure shown in
The coaxial cable 12′ has an outer conductor 112 that may be cylindrical or corrugated, with the latter shown as in
The structure shown in
The port 28 has a threaded component 128 that cooperates with threads 130 on the connector fitting 122 to releasably secure the components in
The invention contemplates variations to the basic structure, as described above. As just one example, the connector assembly 14 is shown in
In
The foregoing disclosure of specific embodiments is intended to be illustrative of the broad concepts comprehended by the invention.
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