Patent Application
20060014426
This invention relates to terminals for coaxial cables and more particularly to compression connectors for coaxial cables.
The deployment of 50 ohm coaxial cable, such as, for example 200, 400 and 500 sizes of cable, for video and data transfer is increasing. Present 50 ohm connectors require labor intensive and craft sensitive installation. In one proposed approach, the 50 ohm connector is supplied as a kit and is assembled onto a coaxial cable in stages. The assembly must occur in a set order and may require soldering for proper assembly. Another proposed approach uses multiple threaded body sections and requires the use of multiple wrenches to draw the separate body sections together thereby exerting a clamping force on to the cable. The connectors used in both of these approaches are relatively expensive due to the number of precision parts involved. Furthermore, both of these approaches are prone to installation errors that may not be readily apparent to the installer, e.g., the threaded body sections are not fully tightened together. Additionally, many of the approaches used to install connectors on the ends of coaxial cables have relied on a component of the connector forcefully moving against the outer conductor and/or the protective jacket of the cable. The relative motion between the connector component and the cable may result in damage to the cable which in turn may degrade the operational effectiveness and reliability of the deployed cable or its connection.
Additionally, the preparation of an end of a smaller diameter coaxial cable for the installation of a connector can lead to a larger than normal profile due to the 50 ohm braid. This increased profile and the requirement that the post of the connector is forced under the braid layer which stretches the braid and the cable jacket requires a larger clearance diameter for inserting the cable into the connector.
Furthermore, it is desirable to keep the distance from the opening of the connector to the end of the post as short as possible. Keeping this distance as short as possible aids the installer in aligning the center conductor and dielectric layer for insertion within the post.
Therefore there is a need for a connector for 50 ohm coaxial cables that is simple to install, effective at establishing both electrical and mechanical engagement to the cable, and overcomes the aforementioned problems.
Therefore, and according to one illustrative embodiment of the present invention, there is provided a compression connector for the end of a coaxial cable. The coaxial cable has a center conductor surrounded by a dielectric layer, the dielectric layer being surrounded by a conductive grounding sheath, and the conductive grounding sheath being surrounded by a protective outer jacket. The grounding sheath may include a single layer of foil with a metal braided mesh or multiple layers of conductive foil and a braided mesh of conductive wire. The compression connector includes a body having a first end and a second end, the body defines an internal passageway. The compression connector further includes a tubular post having a first end and a second end. The first end is configured for engagement with a portion of the conductive grounding sheath and may be inserted between the conductive grounding sheath and the dielectric layer of the coaxial cable. A portion of the second end of the tubular post is configured for engagement with the body at a predetermined position within the internal passageway. The compression connector further includes a compression member having a first end and a second end. The first end includes an outer surface and an inner surface, the outer surface is configured for engagement with a portion of the internal passageway at the first end of the body. The compression connector further includes a ring member having first end, a second end and a cylindrical inner surface. The first end of the ring member is configured for engagement with the inner surface of the compression member.
According to another embodiment of the present invention there is provided a compression connector for the end of a coaxial cable. The coaxial cable includes a center conductor surrounded by a dielectric layer, the dielectric layer being surrounded by a conductive grounding sheath, and the conductive grounding sheath being surrounded by a protective outer jacket. The compression connector includes a connector body having a first end, a second end and a longitudinally extending passageway including at least one shoulder. The compression connector further includes a compression sleeve wedge configured for slideable engagement within the passageway of the connector body. The compression sleeve wedge includes a ramped inner surface. The compression connector further includes a compression ring disposed between the connector body and the compression wedge. The compression ring is disposed adjacent to the compression wedge and the compression ring is configured to receive the outer surface of the protective outer jacket. The compression ring includes an outer surface configured for engagement with the ramped inner surface. The compression connector further includes a post at least partially disposed within the connector body. The post is configured to abut the compression ring and includes an end configured for insertion between the grounding sheath and the dielectric layer to engage at least a portion of the grounding sheath.
According to another embodiment of the present invention there is provided a compression connector for the end of a coaxial cable. The coaxial cable includes a center conductor surrounded by a dielectric layer, the dielectric layer being surrounded by a conductive grounding sheath, and the conductive grounding sheath being surrounded by a protective outer jacket. The compression connector includes a body having a first end and a second end, with the body defining an internal passageway. The compression connector further includes a tubular post having a first end and a second end. The first end of the post is configured for engagement with the conductive grounding sheath and a portion of the second end of the post is configured for engagement with the body between the first and the second end of the internal passageway. The compression connector further includes a compression member. The compression member has a first end and a second end. The compression member is moveable from a first position at the first end of the body to a second position within the body. The first end includes an outer surface and an inner surface, the outer surface is configured for engagement with a portion of the internal passageway at the first end of the body. The compression connector further includes a compression element. The compression element has a first end, a second end and an inner surface. The first end of the compression element is configured for engagement with the inner surface of the compression member and the inner surface of the compression member is configured to cause the compression element to radially inwardly change shape upon advancement of the compression member from the first position to the second position.
According to another embodiment of the present invention there is provided a compression connector for the end of a coaxial cable. The coaxial cable includes a center conductor surrounded by a dielectric layer, the dielectric layer being surrounded by a conductive grounding sheath, and the conductive grounding sheath being surrounded by a protective outer jacket. The compression connector includes means for electrically connecting the coaxial cable to an electrical device; means for receiving the coaxial cable; and means for applying a circumferential clamping force to the protective outer jacket of the coaxial cable whereby the coaxial cable is coupled to or engaged with the compression connector.
According to yet another embodiment of the present invention there is provided a compression connector for the end of a coaxial cable. The coaxial cable has a center conductor surrounded by a dielectric layer, the dielectric layer being surrounded by a conductive grounding sheath, and the conductive grounding sheath being surrounded by a protective outer jacket. The compression connector includes a body having a first end and a second end, the body defines an internal passageway. The compression connector further includes a tubular post having a first end and a second end. The first end is configured for insertion between the conductive grounding sheath and the dielectric layer of the coaxial cable. A portion of the second end of the tubular post is configured for engagement with the body at a predetermined position within the internal passageway. The compression connector further includes a compression member having a first end and a second end. The first end includes an outer surface and a tapered inner surface, the outer surface is configured for engagement with a portion of the internal passageway at the first end of the body. The compression member at the first end of the body is at a first position and can be moved to a second position. The compression connector further includes a ring member having first end, a second end and a cylindrical inner surface. The first end of the ring member is configured for engagement with the tapered inner surface of the compression member. The tapered or inner surface of the compression member is configured to cause the ring member to radially inwardly change shape upon advancement of the compression member from the first position to the second position.
According to yet another embodiment of the present invention, there is provided a method for installing a compression connector on the end of a coaxial cable. The coaxial cable has a center conductor surrounded by a dielectric layer, the dielectric layer being surrounded by a conductive grounding sheath, and the conductive grounding sheath being surrounded by a protective outer jacket. The method includes the step of providing a connector in a first preassembled configuration. The connector includes a connector body defining an internal passageway and a post member configured and dimensioned for insertion into the internal passageway of the connector body. The post member is dimensioned for an interference fit with the connector body. The post member also defines an inner first cavity and includes a first opening and a second opening each communicating with the inner first cavity. The post member further includes a base proximate to the second opening, a ridge proximate to the second opening and a protrusion disposed on an outer annular surface. The post member and the connector body define a first cavity. The compression connector further includes a compression ring or compression element disposed in the first cavity. The compression ring is configured and dimensioned to receive an end of the coaxial cable. The compression connector further includes a compression wedge disposed in a first position proximate to the compression ring thereby allowing the compression ring to receive the end of the coaxial cable. The method further includes the steps of preparing an end of the coaxial cable by separating the center conductor and insulator core from the outer conductor and sheath. The method further includes the step of inserting the prepared coaxial cable end into the connector such that the base of the post member engages the conductive grounding sheath of the coaxial cable and the compression ring is proximate to the protective outer jacket. The method further includes the step of using a tool that engages the compression wedge and the connector body, forcibly sliding the compression wedge from the preassembled first configuration, to an assembled second configuration such that the compression wedge concentrically compresses at least a portion of the compression ring radially inwardly such that the post member and the compression ring provide a continuous 360° engagement with the outer conductor and protective outer jacket of the coaxial cable.
The use of a floating, deformable compression ring as described above solves two of the problems associated with installing 50 ohm connectors on smaller diameter coaxial cables. First, the use of a deformable compression ring results not only in the ability to accommodate different cable diameters but reduces the distance between the opening of the connector and the end of the post. This permits reducing the required insertion length of the prepared cable to be relatively short. Additionally, the floating nature of the compression ring makes possible the advantageous configuration of completely trapping the compression ring within the body of the compression connector, thereby ensuring that the compression ring remains in place prior to installation on a cable. The floating ring of the present invention removes the element of relative motion between the connector compression wedge and the cable. The compression wedge of the present invention slides along the outer surface of the compression ring. The compression ring therefore serves to isolate the cable from the moving compression wedge from the cable, thereby preventing both dislocation of the cable within the connector and damage to the cable from the sliding compression wedge.
In a still further embodiment of the present invention there is provided a compression connector for the end of a coaxial cable. The compression connector includes a connector body which includes first and second ends and a stepped internal passageway. The first end of the connector body receives a deformable post and compression wedge. The deformable post includes an inner sleeve, an outer sleeve, a first open end and a second end which maintains the positions of inner and outer sleeves with respect to one another. The inner sleeve of the deformable post is sized and configured to be inserted between the dielectric layer and grounding shield of a prepared end of a coaxial cable. The outer sleeve includes a shoulder to mate with the internal passageway of the connector body and an inwardly tapered trailing edge at the open end to engage the ramped inner surface of the compression wedge. The second end of the connector body includes any of the well known connector interfaces, such as a BNC connector, an F-type connector, an RCA-type connector, a DIN male connector, a DIN female connector, an N male connector, an N female connector, an SMA male connector and an SMA female connector. The compression wedge is press fitted into the rear open end of the connector body in a first preassembled configuration. The inner and outer sleeves of the deformable post define an annular space which is open at the second end for receiving the conductive grounding sheath and the protective outer jacket layers of the coaxial cable. As the compression wedge is axially advanced, the ramped inner surface of the compression wedge slides over the outer sleeve, and reduces the volume of the annular space between the inner and outer sleeves of the deformable post. The outer sleeve is thus deformed into a 360° engagement with the outer surface of the cable.
It is to be understood that both the foregoing general description and the following detailed description are merely illustrative examples of the invention, and are intended to provide an overview or framework for understanding the nature and character of the invention as it is claimed. The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification. The drawings illustrate various embodiments of the invention, and together with the description serve to explain the principles and operations of the invention.
For a further understanding of these and objects of the invention, reference will be made to the following detailed description of the invention which is to be read in connection with the accompanying drawing, where:
a is a cutaway perspective cross-sectional view of the embodiment of the present invention shown in
Reference will now be made in detail to the present preferred embodiments of the invention, examples of which are illustrated in the accompanying drawings. Whenever possible, the same reference numerals will be used throughout the drawings to refer to the same or like parts for clarity.
According to one embodiment, as shown in
The compression connector 10 includes a compression member in one form a compression wedge 12, a compression element in one form a ring member 14, a post 16 and a connector body 18. The connector body 18 includes a proximal end 40 and a distal end 42. The connector body 18 further includes a central opening 19 extending from the proximal end 40 to the distal end 42. The central opening 19 extends along the longitudinal axis of the connector body 18. The central opening 19 is substantially circular in cross section with the diameter varying along the length of the connector body 18. The end 21 of the central opening 19 adjacent to the proximal end 40 of the connector body 18 is configured to receive the compression wedge 12. In one form the body 18 and wedge 12 define an enclosed space 20 that surrounds the compression ring 14 and the post 16. The central opening 19 can include two internal shoulders 23, 25. The first internal shoulder 23 is configured to receive an end 52 of the post 16. The second internal shoulder 25 defines one boundary of a cavity 32 defined by the post 16 in the central opening 19. The cavity 32 is sized to receive both the compression wedge 12 and the compression ring 14. The connector body 18 further includes two annular grooves 36, 38 disposed on the exterior of the body proximate to the end 21 of the central opening 19. The distal end 42 of the connector body 18 includes a shoulder 39 for retaining an internally threaded nut 41 for use in coupling the compression connector to a complimentary fitting.
The compression wedge 12 includes a central opening 20 oriented along the longitudinal axis of to the compression wedge 12. The central opening 20 is substantially circular in cross section and is sized for a clearance fit with the outer protective jacket of a coaxial cable (not shown). The central opening 20 can include a tapered inner surface 22 having a substantially conical profile. The tapered inner surface 22 engages the outer surface 30 of the compression ring 14 to produce a radially inward force against the compression ring 14 as the compression wedge 12 is moved from a first position as shown in
The compression ring 14 is made of a deformable material and in one form can be plastic but metal is also possible. The compression ring includes an inner surface 28 and an outer surface 30. The inner surface 28 is configured to slide onto the end of the coaxial cable. The compression ring 14 may be a substantially cylindrical body or may employ internal and/or external tapered surfaces. The inner surface 28 may include a tapered region to facilitate sliding onto the end of the coaxial cable. Before the coupling of the compression connector 10 to the coaxial cable, the compression ring 14 is maintained in position within the connector body by compression wedge 12. During the coupling of the compression connector 10 to the coaxial cable, the compression ring 14 butts against either the second internal shoulder 25 of the connector body 18 or a shoulder on the post, as the design may dictate, thereby stopping the axial movement of the compression ring 14. Further axial movement of the compression wedge 12 then results in the generation of a radial inward force on the compression ring 14 which clamps the compression ring to the outer protective jacket and the braided grounding layer, thereby securely coupling the coaxial cable to the compression connector 10. In a preferred arrangement, the compression ring 14 is completely disposed within the proximal end 40 of the connector body 18.
The post 16 includes a proximal end 50 and a distal end 52. The proximal end 50 is configured for insertion between the dielectric layer and the braided grounding layer of the coaxial cable thereby capturing at least a portion of the braided grounding layer and the outer protective jacket of the coaxial cable between the inner surface 28 of the compression ring 14 and the proximal end 50 of the post 16. A shoulder 60 can separate the proximal end 50 from the distal end 52. The proximal end 50 includes a cylindrical region 54 which in one configuration may be as long as the compression ring 14. As shown, the proximal end 50 may include a barb or series of barbs 56 for aid in securing the coaxial cable to the compression connector 10. The distal end 52 of the post 16 is configured to abut the first internal shoulder 23 of the central opening 19 of the connector body 18. In one embodiment, the distal end 52 of the post 16 is sized to have an interference fit with the walls of the central opening 19 to aid in maintaining its position within the connector body.
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Preferably the compression connector 10 is provided as a self-contained, preassembled device ready for connection to a coaxial cable, however, in alternative embodiments the compression connector 10 may be provided as separate components that are individually assembled onto the coaxial cable prior to installation.
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All of preceding embodiments of the present invention may be readily adapted for different types of coaxial cable. For example different diameter cables, such as, for example 200, 400 and 500 size cables may be accommodated by varying the radial dimensions of the compression wedge 12, the compression ring 14 and the post 16.
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The connector body 18 includes a stepped internal passageway 200. An intermediate region 204 of the stepped internal passageway 200 is configured to receive the post 16a. The post 16a is seated against a shoulder 23 and is configured to have an interference fit sufficient to establish electrical connectivity between the post 16a and the connector body 18. In this embodiment, the post 16a is an electrically conductive tubular member having an outer diameter greater than the diameter of the cable to be coupled to the compression connector 10g. The inner diameter of the post 16a is sized to provide a slight interference fit with the first layer of foil over the dielectric layer of the prepared coaxial cable end. The slight interference fit between the first foil layer and the inner diameter of the post 16a establishes electrical connectivity between the post 16a and the first foil layer thereby allowing the rounding of the coaxial cable. The wall thickness of the post 16a allows one end 206 of the post to be used both as a stop for banking the folded over braid of the prepared coaxial cable end and as a stop for the compression ring 14.
The one end 202 of the stepped internal passageway 200 is configured to receive the compression ring 14 and the compression wedge 12. The compression ring 12 may be a deformable metallic member and may be a substantially cylindrical member having a substantially uniform wall thickness or may employ either internally or externally tapered walls or a combination of both. The compression ring 14 is configured to deform when the compression wedge 12 is placed in a predetermined position within the stepped internal passageway 200. When the compression ring 14 is comprised of a deformable metallic material, the deformation of the compression ring 12 engages the portion of the braid folded over the protective jacket of the coaxial cable establishing electrical connectivity therebetween. Furthermore, the compression ring 14 is pressed against the end 206 of the post 16a sufficiently to establish electrical connectivity there between.
The compression wedge 12 includes a central opening 20 oriented along the longitudinal axis of the compression wedge 12. The central opening 20 is substantially circular in cross section and is sized for a clearance fit with the outer protective jacket of a coaxial cable (not shown). The central opening 20 includes a tapered inner surface 22 having a substantially conical profile. The tapered inner surface 22 engages the outer surface 30 of the compression ring 14 to produce a radially inward force against the compression ring 14 as the compression wedge 12 moves from a first position towards a second position during installation of the compression connector 10 onto the end of a coaxial cable. The compression wedge 12 also includes a circumferential ring 26 configured for engagement with a compression tool. The circumferential ring 26 may also be positioned so as to prevent the compression wedge 12 from proceeding too far into the connector body 18 during installation. Typically, the compression wedge 12 is made from a metallic material, for example, brass, or a resilient plastic, such as Delrin®. The circumferential ring 26 may also be used to provide a visual indication that the compression connector 10 has been properly connected to the coaxial cable. As will be appreciated by those skilled in the art, although the compression connector of
Referring to
The connector body 18 includes a stepped internal passageway 200. An intermediate region 204 of the stepped internal passageway 200 is configured to receive the deformable post 160. The first proximal end of the connector body includes any of the well known interfaces discussed above, but is shown in this embodiment with an N male connector. The second distal end of the connector receives a deformable post 160 and compression wedge 12.
The deformable post 160 includes an inner sleeve 161, an outer sleeve 162, a first closed end 163 and a second open end 164. The inner sleeve of the deformable post is sized and configured to be inserted between the dielectric layer and grounding shield of a prepared end of a particularly sized coaxial cable (not shown). The outer sleeve includes a shoulder 165 to mate with the internal bore of the connector body and an inwardly tapered trailing edge 166 at the open end 164 to engage the ramped inner surface 22 of the compression wedge 12. The outer sleeve 162 is seated against a shoulder 23 on the connector body and is configured to have an interference fit sufficient to establish electrical connectivity between the deformable post 160 and the connector body 18. The first end of the deformable post 163 may be fully closed or partially closed but containing structure, such as radial support members between the inner and outer sleeves, to maintain the relative positions thereof. The inner 161 and outer sleeves 162 of the deformable post 160 define an annular space which is open at the second distal end for receiving the conductive grounding sheath and the protective outer jacket layers of the coaxial cable. The outer sleeve 162 of the deformable post 160 is configured to deform when the compression wedge 12 is advanced to a second axial compressed position within the stepped internal passageway 200.
The compression wedge 12 is generally as described above. The compression wedge 12 includes a central opening 20 oriented along the longitudinal axis of the compression wedge 12. The central opening 20 is substantially circular in cross section and is sized for a clearance fit with the outer protective jacket of a coaxial cable (not shown). The central opening 20 includes a tapered inner surface 22 having a substantially conical profile. The tapered inner surface 22 engages the outer surface of the outer sleeve 162 to produce a radially inward force against the outer sleeve of the post as the compression wedge 12 moves from a first position towards a second position during installation of the compression connector 10h onto the end of a coaxial cable. The compression wedge 12 also includes a circumferential ring 26 configured for engagement with a compression tool. The circumferential ring 26 may also be positioned so as to prevent the compression wedge 12 from proceeding too far into the connector body 18 during installation. The circumferential ring 26 may also be used to provide a visual indication that the compression connector 10 has been properly connected to the coaxial cable.
The distal end 42 of the connector body 18 includes a collet 80 and an exterior annular groove 82. The collet 80 provides the female connection for a male N connector interface. The exterior annular groove 82 is adapted to receive a nut retaining ring 84. The nut retaining ring 84 fits into an interior grove 87 in the internally threaded coupling nut 86 whereby the internally coupling nut 86 is coupled to the connector body 18a. The compression connector 10h further includes a mandrel 88 and an insulator 90. The mandrel 88 engages the center conductor of the coaxial cable that the compression connector 10h is being connected to. The mandrel 88 is held in place by the insulator 90 which electrically insulates the mandrel 88 from the connector body 18.
The compression wedge 12 is pressed into the open distal end of the connector body in a first preassembled configuration. As the compression wedge 12 is axially advanced, the ramped inner surface 22 of the compression wedge 12 reduces the volume of the annular space between the inner 161 and outer sleeves 162 of the deformable post. The outer sleeve is thus deformed into engagement with the outer surface of the cable.
While the present invention has been particularly shown and described with reference to the preferred mode as illustrated in the drawings, it will be understood by one skilled in the art that various changes in detail may be effected therein without departing from the spirit and scope of the invention as defined by the claims.
This application is a continuation in part of U.S. Ser. No. 10/892,645 filed Jul. 10, 2004.
| Number | Date | Country | |
|---|---|---|---|
| Parent | 10892645 | Jul 2004 | US |
| Child | 11092197 | Mar 2005 | US |
