BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates generally to electrical connectors, and more particularly to coaxial cable connectors capable of being connected to a terminal.
2. Description of the Related Art
Coaxial cable connectors, such as type F connectors, are used to attach coaxial cable to another object or appliance, e.g., a television set or VCR having a terminal adapted to engage the connector. The terminal of the appliance includes an inner conductor and a surrounding outer conductor.
Coaxial cable includes a center conductor for transmitting a signal. The center conductor is surrounded by a dielectric material, and the dielectric material is surrounded by an outer conductor; this outer conductor may be in the form of a conductive foil and/or braided sheath. The outer conductor is typically maintained at ground potential to shield the signal transmitted by the center conductor from stray noise, and to maintain a continuous desired impedance over the signal path. The outer conductor is usually surrounded by a plastic cable jacket that electrically insulates, and mechanically protects, the outer conductor. Prior to installing a coaxial connector onto an end of the coaxial cable, the end of the coaxial cable is typically prepared by stripping off the end portion of the jacket to bare the end portion of the outer conductor. Similarly, it is common to strip off a portion of the dielectric to expose the end portion of the center conductor.
Coaxial cable connectors of the type known in the trade as “F connectors” often include a tubular post designed to slide over the dielectric material, and under the outer conductor of the coaxial cable, at the prepared end of the coaxial cable. If the outer conductor of the cable includes a braided sheath, then the exposed braided sheath is usually folded back over the cable jacket. The cable jacket and folded-back outer conductor extend generally around the outside of the tubular post and are typically received in an outer body of the connector; this outer body of the connector is usually fixedly secured to the tubular post. A coupler is rotatably secured around the tubular post and includes an internally-threaded region for engaging external threads formed on the outer conductor of the appliance terminal.
When connecting the end of a coaxial cable to a terminal of a television set, equipment box, or other appliance, it is important to achieve a reliable electrical connection between the outer conductor of the coaxial cable and the outer conductor of the appliance terminal. This goal is usually achieved by ensuring that the coupler of the connector is fully tightened over the connection port of the appliance. When fully tightened, the head of the tubular post of the connector directly engages the edge of the outer conductor of the appliance port, thereby making a direct electrical ground connection between the outer conductor of the appliance port and the tubular post; in turn, the tubular post is engaged with the outer conductor of the coaxial cable.
However, in many cases, it is difficult for an installer to reach the connection ports of the appliance with a wrench, and in some instances, it is even difficult for the installer to reach such connection ports with his or her fingers. As a result, it can often happen that type F connectors are not fully tightened to the appliance port. In such a loose connection system, wherein the coupler of the coaxial connector is not drawn tightly to the appliance port connector, a gap exists between the outer conductor of the appliance port and the tubular post of the connector. Unless an alternate ground path exists, poor signal quality, and RFI leakage, will result.
As mentioned above, the coupler is rotatably secured about the head of the tubular post. The head of the tubular post usually includes an enlarged shoulder, and the coupler typically includes an inwardly-directed flange for extending over and around the shoulder of the tubular post. In order not to interfere with free rotation of the coupler, manufacturers of such F-style connectors routinely make the outer diameter of the shoulder (at the head of the tubular post) of smaller dimension than the inner diameter of the central bore of the coupler. Likewise, manufacturers routinely make the inner diameter of the inwardly-directed flange of the coupler of larger dimension than the outer diameter of the non-shoulder portion of the tubular post, again to avoid interference with rotation of the coupler relative to the tubular post. In a loose connection system, wherein the coupler of the coaxial connector is not drawn tightly to the appliance port connector, an alternate ground path may fortuitously result from contact between the coupler and the tubular post, particularly if the coupler is not centered over, and axially aligned with, the tubular post. However, this alternate ground path is not stable, and can be disrupted as a result of vibrations, movement of the appliance, movement of the cable, or the like.
Alternatively, there are some cases in which such an alternate ground path is provided by fortuitous contact between the coupler and the outer body of the coaxial connector, provided that the outer body is formed from conductive material. This alternate ground path is similarly unstable, and may be interrupted by relative movement between the appliance and the cable, or by vibrations. Moreover, this alternate ground path does not exist at all if the outer body of the coaxial connector is constructed of non-conductive material. Such unstable ground paths can give rise to intermittent failures that are costly and time-consuming to diagnose.
OBJECTS OF THE INVENTION
It is therefore an object of the present invention to provide a coaxial cable connector for connecting a coaxial cable to a connection port of an appliance, the coaxial cable connector being of the type that includes a tubular post and a coupler, such as a rotatable coupler, which ensures a reliable ground connection between the tubular post of the connector and an outer conductor of the appliance port, even if the coupler is not fully tightened onto the appliance port.
It is another object of the present invention to provide such a coaxial cable connector which maintains a reliable ground path between the coupler and the tubular post, at least following installation of such connector onto the end of a coaxial cable.
It is still another object of the present invention to provide such a coaxial connector that can be manufactured economically.
These and other objects of the present invention will become more apparent to those skilled in the art as the description thereof proceeds.
SUMMARY OF THE INVENTION
Briefly described, the present invention relates to a coaxial cable connector comprising a tubular post, a coupler and a grounding means for providing an electrically conductive path between the post and the coupler. In accordance with a preferred embodiment thereof, the present invention relates to a coaxial cable connector for coupling a prepared end of a coaxial cable to a threaded female equipment port, and including a tubular post having a first end adapted to be inserted into the prepared end of the coaxial cable between the dielectric material and the outer conductor thereof. A coupler is rotatably secured over the second end of the tubular post, and includes a central bore, at least a portion of which is threaded for engaging the female equipment port. An outer body is secured to the tubular post and extends about the first end of the tubular post for receiving the outer conductor, and preferably the cable jacket, of the coaxial cable.
In a preferred embodiment of the present invention, a resilient, electrically-conductive grounding member is disposed between the tubular post and the coupler. This grounding member engages both the tubular post and the coupler for providing an electrically-conductive path therebetween, but without restricting rotation of the coupler relative to the tubular post.
For some preferred embodiments, the grounding member is generally arcuately shaped to extend around the tubular post over an arc of at least 225°, and may extend for a full 360°. This arcuately shaped grounding member may be in the form of a generally circular broken ring, or C-shaped member, as by bending a strip of metal wire into an arc. Preferably, the grounding member has a shape that is out-of-round, and more preferably oblong, rather than circular, in order to ensure reliable electrical contact with both the coupler and the tubular post. In order to retain the grounding member inside the coupler, the inner bore of the coupler may include an annular recess proximate to the end of the coupler that encircles the tubular post; at least portions of the grounding member are engaged with the annular recess to prevent the grounding member from being axially displaced within the coupler.
As mentioned above, the tubular post may include an enlarged shoulder at the head thereof. In one preferred embodiment of the present invention, the grounding member surrounds the enlarged shoulder of the tubular post, at least when the coaxial cable connector is assembled onto the prepared end of a coaxial cable, whereby at least portions of the grounding member engage the outer surface of such enlarged shoulder.
In one embodiment of the present invention, the grounding member is generally circular and includes a plurality of projections extending outwardly therefrom for engaging the coupler. In another embodiment of the present invention, the grounding member is generally circular and includes a plurality of projections extending inwardly therefrom for engaging the tubular post.
In yet another embodiment of the present invention, the tubular post includes an enlarged shoulder extending inside the coupler, and including a first radial face that faces the opposite end of the tubular post. The coupler includes a flange directed inwardly toward the tubular post; this inwardly directed flange including a second radial face that faces toward the connection port of the appliance to which the coaxial cable is to be connected. The grounding member is disposed between the first radial face and the second radial face. In this embodiment, the grounding member is resilient relative to the longitudinal axis of the connector, and is compressed between the first radial face and the second radial face to maintain sliding electrical contact between the shoulder of the tubular post (via its first radial face) and the flange of the coupler (via its second radial face).
The coaxial connector of the present invention may also include a sealing ring seated within the coupler for rotatably engaging the body member to form a seal therebetween.
In an alternate embodiment of the present invention, conductive grease is substituted for a discrete grounding member. In this embodiment, an outer dimension of a portion of the tubular post is caused to be commensurate with an inner dimension of an adjacent portion of the coupler. While the gap between such adjacent portions, coupled with the lubrication provided by the conductive grease, is sufficient to permit rotation of the coupler relative to the tubular post, the conductive grease nonetheless functions to maintain reliable electrical coupling across such gap.
BRIEF DESCRIPTION OF THE DRAWINGS
The present invention will be described with greater specificity and clarity with reference to the following drawings, in which:
FIG. 1 is a perspective view of an F connector in accordance with the preferred embodiment of the invention, including a body and a coupling nut;
FIG. 2 is an exploded view of the F connector of FIG. 1, including a preferred embodiment of a grounding member;
FIG. 2A is an enlarged plan view of the preferred embodiment of the grounding member of FIG. 2;
FIG. 3 is a cross-sectional view of the F connector of FIG. 1 through cut-line 3-3, and a side view of a prepared coaxial cable ready to be inserted into a back end of the F connector;
FIG. 3A is a cross-sectional view of the body of the F connector of FIG. 1 through cut-line 3-3;
FIG. 3B is a cross-sectional view of a tubular post of the F connector of FIG. 1, through cut-line 3-3;
FIG. 3C is a cross-sectional view of the coupling nut of the F connector of FIG. 1 through cut-line 3-3;
FIG. 4 is a cross-sectional view of the F connector of FIG. 1 through cut-line 3-3, and cross-sectional view of the prepared coaxial cable fully inserted into the back end thereof, prior to axial compression of the F connector;
FIG. 4A is an enlargement of a portion of FIG. 4;
FIG. 5 is a cross-sectional view of the F connector of FIG. 1 through cut-line 3-3, and a cross-sectional view of the prepared coaxial cable fully inserted into the back end thereof, subsequent to axial compression of the F connector;
FIG. 5A is an enlargement of a portion of FIG. 5;
FIG. 6 is a partial cross-sectional view of a first alternate embodiment of an F connector having a first alternate grounding member;
FIG. 6A is an enlargement of a portion of FIG. 6;
FIG. 6B is a slightly enlarged side view of the first alternate grounding member of FIG.6;
FIG. 6C is a slightly enlarged plan view of the first alternate grounding member of FIG. 6;
FIG. 7 is a partial cross-sectional view of a second alternate embodiment of an F connector having a second alternate grounding member;
FIG. 7A is an enlargement of a portion of FIG. 7;
FIG. 7B is a slightly enlarged side view of the second alternate grounding member of FIG. 7;
FIG. 7C is a slightly enlarged plan view of the second alternate grounding member of FIG. 7;
FIG. 8 is a partial cross-sectional view of a third alternate embodiment of an F connector having a third alternate grounding member;
FIG. 8A is a slightly enlarged side view of the third alternate grounding member of FIG. 8;
FIGS. 8B-8E are slightly enlarged plan views of four styles of the third alternate grounding member of FIG. 8;
FIG. 9 is a partial cross-sectional view of a fourth alternate embodiment of an F connector having one of a fourth alternate grounding member and a fifth alternate grounding member;
FIG. 9A is a slightly enlarged side view of the fourth alternate grounding member of FIG. 9;
FIG. 9B is a slightly enlarged plan view of the fourth alternate grounding member of FIG. 9;
FIG. 9C is a slightly enlarged side view of the fifth alternate grounding member of FIG. 9;
FIG. 9D is a slightly enlarged plan view of the fifth alternate grounding member of FIG. 9;
FIG. 10 is a partial cross-sectional view of a fifth alternate embodiment of an F connector having conductive grease that acts as a grounding member;
FIG. 11 is a partial cross-sectional view of a front end of a sixth alternate embodiment of an F connector having a sixth alternate grounding member;
FIG. 11 A is an enlargement of a portion of FIG. 11;
FIG. 11 B is a side view of the sixth alternate grounding member of FIG. 11;
FIG. 11C is a plan view of the sixth alternate grounding member of FIG. 11; and
FIG. 11D is a perspective view of the sixth alternate grounding member of FIG. 11.
For simplicity and clarity of illustration, the drawing figures illustrate the general manner of construction, and descriptions and details of well-known features and techniques are omitted to avoid unnecessarily obscuring the invention. Furthermore, elements in the drawing figures are not necessarily drawn to scale.
DESCRIPTION OF THE PREFERRED EMBODIMENT
FIG. 1 is a perspective view of an F connector 100 in accordance with the preferred embodiment of the invention. The F connector 100 (hereinafter, “connector”) has a longitudinal axis 101. The connector has a front end 102 and a back end 103.
FIG. 2 is an exploded view of the connector 100. The connector 100 includes tubular post 104, a coupling nut 105 rotatably secured over an end 106 of the tubular post for securing the connector to an appliance (not shown), and a body 108 secured to the tubular post. A shell 107 and a label 109 are secured to the body 108. Preferably, the body 108 is made entirely of acetal plastic. Alternatively, the body 108 is made of brass, plated with nickel. The shell 107 adds strength to the plastic body 108 and protects the plastic body from ultraviolet light. The tubular post 104 is preferably metallic, and more preferably, made of brass, with a tin plating; as tin is more conductive than nickel. The coupling nut 105 is preferably metallic, and more preferably, formed from brass, plated with nickel or with another non-corrosive material.
In the embodiment shown in the drawings, the coupling nut 105 is rotatably secured over an end 106 of the tubular post 104 via a neck 111 of the body 108. Advantageously, an electrical grounding path is constantly maintained between the coupling nut 105 and the tubular post 104, including, in particular, when the coupling nut 105 of the connector 100 is not tightly fastened to the appliance. The electrical grounding path is provided by a resilient, electrically-conductive grounding member 110 disposed between the tubular post 104 and the coupling nut 105.
FIG. 2A is an enlarged plan view of the preferred embodiment of the grounding member 110. In the preferred embodiment of the present invention, the electrically-conductive grounding member 110 is disposed between the tubular post 104 and the coupling nut 105. The grounding member 110 contacts both the tubular post 104 and the coupling nut 105 for providing an electrically-conductive path therebetween, but without restricting rotation of the coupling nut relative to the tubular post. A preferred embodiment of the grounding member 110 shown in FIG. 2A is a spring member, or circlip, disposed between the coupling nut 105 and the tubular post 104, which establishes a stable ground path between the coupling nut and the post, and which is preferably constructed of a wire-type material. The grounding member 110 is retained in the coupling nut 105 by an annular recess 343 (see FIG. 3C) in the coupling nut. The spring action of the grounding member 110 serves to form a ground path from the coupling nut 105 to the tubular post 104 while allowing the coupling nut 105 to rotate. The grounding member 110 is resilient and is generally arcuately shaped. The grounding member 110 extends around the tubular post 104 over an arc of at least 225°, and may extend for a full 360°. The arcuately shaped grounding member 110 may be in the form of a generally circular broken ring, or C-shaped member, as by bending a strip of metal wire into an arc. Preferably, the grounding member 110 is a C-shaped metal clip that has an arcuate curvature that is non-circular. The grounding member 110 has a minimum diameter 201 and a maximum diameter 203. Preferably, the grounding member 110 is made of stainless steel wire that has a wire diameter of between 0.010-inch and 0.020-inch; in a preferred embodiment, the wire diameter is about 0.016-inch. Stainless steel is a preferred metal for the grounding member 110 because it need not be plated for corrosion resistance.
FIG. 3 is a cross-sectional view of the connector 100 through cut-line 3-3 of FIG. 1, and a side view of a prepared coaxial cable 301 ready to be inserted into a back end 103 of the connector. The center conductor 302 of the coaxial cable 301 is surrounded by a dielectric material 303, and the dielectric material is surrounded by an outer conductor 304 that may be in the form of a conductive foil and/or braided sheath. The outer conductor 304 is usually surrounded by a plastic cable jacket 305 that electrically insulates, and mechanically protects, the outer conductor.
FIG. 3A is a cross-sectional view of the body 108 of FIG. 1 through cut-line 3-3. FIG. 3B is a cross-sectional view of the tubular post 104 of FIG. 1 through cut-line 3-3. FIG. 3C is a cross-sectional view of the coupling nut 105 of FIG. 1 through cut-line 3-3. Referring now to FIGS. 3, 3A, 3B and 3C, the body 108 has a lip 310 at a front end of the body. The lip 310 has an outer diameter 311 and an inner diameter 312. The coupling nut 105 is rotatably secured about a head 330 at the front end of the tubular post 104. The head 330 of the tubular post 104 usually includes an enlarged shoulder 332. The coupling nut 105 typically includes an inwardly-directed flange 340 that extends over and around the shoulder 332 of the tubular post 104. In order to retain the grounding member 110 inside the coupling nut 105, the inner, or central, bore 342 of the coupling nut 105 may include an annular recess 343 that is proximate to the end of the coupling nut that encircles the tubular post 104. At least portions of the grounding member 110 are engaged with the annular recess 343 to prevent the grounding member from being axially displaced within the coupling nut 105. The tubular post 104 may include an enlarged shoulder 332 at the head 330 thereof. The shoulder 332 has a first radial face 333 that faces the back end of the tubular post 104. In one preferred embodiment of the present invention, the grounding member 110 surrounds the enlarged shoulder 332 of the tubular post 104, at least when the connector 100 is assembled onto the prepared end of a coaxial cable 301. At least portions of the grounding member 110 contact the outer surface 334 of such enlarged shoulder 332.
The coupling nut 105 has an inwardly-directed flange near the back end of the coupling nut. The coupling nut 105 has an inner diameter 341 at a back end of the coupling nut. In order to retain the back end of the coupling nut 105 on the front end of the body 108, the inner diameter 341 of the coupling nut has a dimension less than the outer diameter of the lip 310 of the body 108. In order not to interfere with free rotation of the coupling nut 105, the outer diameter 336 of the shoulder 332 (at the head 330 of the tubular post 104) is of smaller dimension than the inner diameter 344 of the central bore of the coupling nut 105. Likewise, the inner diameter 341 of the inwardly-directed flange 340 of the coupling nut 105 is of larger dimension than the outer diameter 337 of the non-shoulder portion 338 of the tubular post 104, again to avoid interference with rotation of the coupling nut 105 relative to the tubular post.
FIG. 4 is a cross-sectional view of the connector 100 through cut-line 3-3, and cross-sectional view of the prepared coaxial cable 301 fully inserted into the back end 103 thereof, prior to axial compression of the connector. FIG. 4A is an enlargement of a portion of FIG. 4. Referring now to FIGS. 4 and 4A, the resilient, electrically-conductive grounding member 110 is shown disposed between the tubular post 104 and the coupling nut 105. The grounding member 110 is disposed in the annular recess 343 that encircles the tubular post 104.
FIG. 5 is a cross-sectional view of the connector 100 through cut-line 3-3, and a cross-sectional view of the prepared coaxial cable 301 fully inserted into the back end 103 thereof, subsequent to axial compression of the connector. FIG. 5A is an enlargement of a portion of FIG. 5. Referring now to FIGS. 5 and 5A, as a result of axial compression by a standard compression tool (not shown), the tubular post 104 slides (to the right in the drawings) relative to the other components of the connector 100 and relative to the cable 301, such that the shoulder 332 of the tubular post is radially inward of the grounding member 110. At least a portion of the grounding member 110 engages the coupling nut 105 at the annular recess 343 of the coupling nut, and at least another portion of the grounding member engages tubular post 104 at the shoulder 332 of the tubular post. The tubular post 104 is in electrical contact with the outer conductor 304 of the cable 301 along the back portion of the tubular post, and the coupling nut 105 may engage the outer conductor of an appliance port (not shown). Therefore, when the connector 100 is fastened to an appliance port, there is maintained an electrical grounding path between the outer conductor 304 of the cable 301 and the outer conductor of the appliance port, whether or not the coupling nut 105 of the connector is tightly fastened to the appliance port.
FIG. 6 is a partial cross-sectional view of a first alternate embodiment of a connector 600 having a first alternate grounding member 601 (see FIGS. 6A-6C), shown subsequent to axial compression. FIG. 6A is an enlargement of a portion of the first alternate embodiment of the connector 600 showing a portion of the first alternate grounding member 601. FIG. 6B is a slightly enlarged side view of the first alternate grounding member 601. FIG. 6C is a slightly enlarged plan view of the first alternate grounding member 601. Referring now to FIGS. 6, 6A, 6B and 6C, the first alternate grounding member 601 is a spring finger grounding member retained between the coupling nut 105 and the tubular post 104. The first alternate grounding member 601 is constructed of a thin cross section of material such beryllium copper. The first alternate grounding member 601 comprises a ring portion 602 and a plurality of fingers 603 that project at approximately a 30° angle from the plane of the ring. The spring action of the fingers 603 extend to, and make contact with, a radial surface 604 near the back end of the coupling nut 105 that faces the front end of the coupling nut, which serve to connect a ground path from the coupling nut to the tubular post while allowing the coupling nut to rotate. The first alternate grounding member 601 has optional internal lugs 605 that contact the outer diameter 337 of the non-shoulder portion of the tubular post.
FIG. 7 is a partial cross-sectional view of a second alternate embodiment of a connector 700 having a second alternate grounding member 701 (see FIGS. 7A-7C). FIG. 7A is an enlargement of a portion of the second alternate embodiment of the connector 700, showing a portion of the second alternate grounding member 701. FIG. 7B is a slightly enlarged side view of the second alternate grounding member 701. FIG. 7C is a slightly enlarged plan view of the second alternate grounding member 701. Referring now to FIGS. 7, 7A, 7B and 7C, the second alternate grounding member 701 is a radial grounding member retained between the coupling nut 105 and the tubular post 104. The second alternate grounding member 701 is constructed of a thin cross section of metallic material such as beryllium copper. The second alternate grounding member 701 comprises a ring portion 702 and a plurality of fingers 703 extending radially from the ring portion at about a 45° angle from the plane of the ring portion. The spring action of the fingers 703 extend to inner-diameter surfaces 705 of the coupling nut 105 and serve to connect a ground path from the coupling nut to the tubular post 104 while allowing the coupling nut to rotate.
FIG. 8 is a partial cross-sectional view of a third alternate embodiment of a connector 800 having a third alternate grounding member 801 (see FIGS. 8A-8E). FIG. 8A is a slightly enlarged side view of the third alternate grounding member 801. FIGS. 8B-8E are slightly enlarged plan views of four styles of the third alternate grounding member 801. Referring now to FIG. 8 and FIGS. 8A-8E, the third alternate grounding member 801 is a conductive member retained between the coupling nut 105 and the tubular post 104. The third alternate grounding member 801 is constructed of a thin cross section of metallic material such as brass or beryllium copper. The third alternate grounding member 801 comprises a ring 802 with multiple points of contact, or internal lugs, 803 around the inner perimeter of the ring and with multiple external lugs 804 around the outer perimeter of the ring. The lugs 803 and 804 serve to connect a ground path from the coupling nut 105 to the tubular post 104 while allowing the coupling nut to rotate. FIGS. 8B-8E show four styles with regard to the shape of the lugs 803 and 804 and the position of the lugs on the ring 802. FIG. 8 also exhibits an alternate embodiment comprising a sealing ring 805 for forming a moisture seal between the coupling nut 105 and the body 108 of the connector 801. The sealing ring 805 is disposed between the back end of the coupling nut 105 and the body 108 for forming a seal therebetween. Preferably, the sealing ring 805 is made from ethylene propylene. Use of the sealing ring 805 is not limited to use in connectors having the third alternate grounding member 801. The third alternate grounding member 801 may also be used in connectors without the sealing ring 805.
FIG. 9 is a partial cross-sectional view of a fourth alternate embodiment of a connector 900 having one of a fourth alternate grounding member 901 and a fifth alternate grounding member 911 (see FIGS. 9A-9D). FIG. 9A is a slightly enlarged side view of the fourth alternate grounding member 901. FIG. 9B is a slightly enlarged plan view of the fourth alternate grounding member 901. FIG. 9C is a slightly enlarged side view of the fifth alternate grounding member 902. FIG. 9D is a slightly enlarged plan view of the fifth alternate grounding member 911. The fourth and fifth alternate embodiments of the grounding member 901 and 911, respectively, comprise a C-shaped ring between the coupling nut 105 and the tubular post 104. The C-shaped ring is constructed of a thin cross section of metallic material such as beryllium copper or stainless steel. It is retained by a groove in the coupling nut. The spring action of the C-shaped ring serves to connect a ground path from the coupling nut 105 to the tubular post 104 while allowing the coupling nut to rotate. The fourth alternate grounding member 901 includes a circumferential metallic band 902, which has a general circular shape and approximates a section of a hollow cylinder, that extends between first 903 and second 904 opposing ends. The band 902 has first 906 and second 907 opposing side edges extending along its length. The fourth alternate grounding member 901 includes a first generally radial wall 908 extending from the first side edge 906 of the band in a first radial direction, and a second generally radial wall 909 extending from the second side edge 907 of the band generally in said first radial direction. The band 902 contacts a first one of the group of members that includes the coupling nut 105 and the tubular post 104. The first 908 and second 909 radial walls contact the second of the group of members that includes the coupling nut 105 and the tubular post 104. The fifth alternate grounding member 911 includes a metallic band 912 extending along its length between first 913 and second 914 opposing ends, and extending along its width between first 916 and second 917 side edges. The band 912 is formed along its length into a generally circular shape. The band 912 is formed along its width into a generally concave shape with the side edges 916 and 917 projecting generally in a first radial direction. The fifth alternate grounding member 911 includes a plurality of projections 918 extending from the band 912 in a second radial direction opposite to the first radial direction. The first 916 and second 917 side edges of the band 912 contact a first one of the group of members that includes the coupling nut and the tubular post. The plurality of projections 918 contact the second of the group of members that includes the coupling nut 105 and the tubular post 104.
FIG. 10 is a partial cross-sectional view of a fifth alternate embodiment of a connector 1000 having conductive grease (not shown) that acts as a grounding member. The ground path is established by means of a close fit between the coupling nut 105 and the tubular post 104. The conductive grease is disposed at a grease annular ring 1001 where mating portions of the tubular post 104 and coupling nut 105 have closely matching dimensions. Preferably, the conductive grease is a silver-loaded silicon lubricating material. The conductive grease serves to connect a ground path from the coupling nut 105 to the tubular post 104 while allowing the coupling nut to rotate.
FIG. 11 is a partial cross-sectional view of a front end of a sixth alternate embodiment of an F connector 1100 that includes a body 1108, and which has a sixth alternate grounding member 1101. FIG. 11A is an enlargement of a portion of FIG. 11. FIG. 11B is a side view of the sixth alternate grounding member 1101. FIG. 11C is a plan view of the sixth alternate grounding member 1101. FIG. 11D is a perspective view of the sixth alternate grounding member 1101. Referring now to FIG. 11 and FIGS. 11A-11D, the sixth alternate grounding member 1101 includes a circumferential metallic band 1112 extending between first 1113 and second 1114 opposing ends. The band 1112 has a generally circular shape that approximates a section of a hollow cylinder. The first 1113 and second 1114 ends of the band 1112 are disposed generally proximate to each other and are directed generally toward one another. The band 1112 has first and second opposing side edges 1115 and 1116, respectively, extending along its length. The band generally defines a section of a cylindrical surface. The sixth alternate grounding member 1101 includes a plurality of projections 1101 extending from at least one of the first and second side edges 1115 and 1116 of the band 1112. The plurality of projections 1117 extend away from the cylindrical surface defined by the band 1112. The band 1112 contacts a first one of the group of members that includes the coupling nut 1105 and the tubular post 1104. The plurality of projections 1117 contact the second of the group of members that includes the coupling nut 1105 and the tubular post 1104.
In preferred embodiments, the present invention provides a coaxial cable connector that ensures a reliable grounding path without creating undue interference with free rotation of the coupler relative to the remaining components of the connector; however, the present invention can also provide a reliable grounding path between a post and a coupler that does not rotate. Advantageously, a connector in accordance with the invention works with standard installation tools and with standard compression tools. The present invention can be used with both axially-compressible connectors as well as with older-style crimp-ring connectors. In some embodiments, the present invention is compatible with the use of a sealing ring for forming a moisture seal between the coupler and the outer body of the connector.
While the present invention has been described with respect to preferred embodiments thereof, such description is for illustrative purposes only, and is not to be construed as limiting the scope of the invention. Various modifications and changes may be made to the described embodiments by those skilled in the art without departing from the true spirit and scope of the invention as defined by the appended claims. For example, the grounding member can have a shape other than generally circular, such as square, hexagonal, octagonal, oval, etc.
LIST OF REFERENCE NUMERALS
100 F connector (“connector”)
101 Longitudinal axis
102 Front end
103 Back end
104 Tubular post
105 Coupling nut
106 End of tubular post
107 Shell
108 Body
109 Label
110 Grounding member
111 Neck
201 Minimum diameter
203 Maximum diameter
301 Coaxial cable
302 Center conductor
303 Dielectric material
304 Outer conductor
305 Jacket
310 Lip of body
311 Outer diameter of lip body
312 Inner diameter of lip of body
330 Head of tubular post
332 Shoulder of tubular post
333 First radial face of shoulder of tubular post
334 Outer surface of shoulder
336 Outer diameter of shoulder
337 Outer diameter of non-shoulder portion of post
338 Non-shoulder portion of post
340 Inwardly-directed flange of coupling nut
341 Inner diameter of inwardly-directed flange
342 Bore of coupling nut
343 Annular recess of coupling nut
344 Inner diameter of bore of coupling nut
600 First alternate connector
601 First alternate grounding member
602 Ring portion of first alternate grounding member
603 Fingers of first alternate grounding member
604 Radial surface of coupling nut
605 Internal lugs of first alternate grounding member
700 Second alternate connector
701 Second alternate grounding member
702 Ring portion of second alternate grounding member
703 Fingers of second alternate grounding member
800 Third alternate connector
801 Third alternate grounding member
802 Ring portion of third alternate grounding member
803 Internal lugs of third alternate grounding member
804 External lugs of third alternate grounding member
805 Sealing ring
900 Fourth alternate connector
901 Fourth alternate grounding member
902 Band of fourth alternate grounding member
903 First end of band
904 Second end of band
906 First side edge of band
907 Second side edge of band
908 First radial wall of band
909 Second radial wall of band
911 Fifth alternate grounding member
1000 Fifth alternate connector
1001 Grease annular ring
1100 Sixth alternate connector
1101 Sixth alternate grounding member
1104 Tubular post of sixth alternate connector
1105 Coupling nut of sixth alternate connector
1108 Body of sixth alternate connector
1112 Band of sixth alternate grounding member
1113 First end of band
1114 Second end of band
1115 First side edge of band
1116 Second side edge of band
1117 Projections on band
Patent Grant
7479035
