FIELD OF THE INVENTION
The present invention is generally related to connectors and more specifically to single pair ethernet plugs using an LC form factor.
BACKGROUND
Copper connectors are becoming increasingly compact in an effort to achieve a higher density of data channels in a given area, as well as for use in applications where data needs to be transmitted to remote devices, such as security cameras and climate control devices. These compact connectors are generally required to be installable onto cable in the field using simple hand operated tools. Typically, for an ethernet data connection, a four pair cable solution would be deployed using RJ45 jacks as the interconnection. However the full bandwidth of a Cat 6a system is not necessary for low bandwidth applications such as, but not limited to, sensors, lights, and other smart building devices. In this case, a single twisted pair cabling solution can be deployed that will save material costs as well as reduce the amount of space used by the structured cabling system. With the recent advancements of ethernet bandwidths using copper media, the data throughput will be adequate for most smart devices. The field terminable design provides an advantage by allowing installers to build custom cabling structures and only use the necessary amount of cable for the end user's application. This customization eliminates the need for additional cabling management techniques which saves time and resources for field technicians deploying the structured cabling system. The present invention describes a single pair connector that provides these advantages, but contains several small complex parts that increase cost of manufacture and are prone to broken or lost pieces.
What is needed is a termination design that can be adapted to a small form factor that is simple and inexpensive to manufacture as well as quickly and easily terminated by an installer without complex and expensive tools.
SUMMARY
A communications connector has a main plug assembly and a wire cap that is configured to terminate a pair of conductors to the pair of contacts by being secured to a side of the main plug assembly in a direction perpendicular to a plane defined by a deflection direction of a latch of the connector. In another embodiment, a communications connector has a main plug assembly and two electrical contacts within the main plug assembly wherein each electrical contact has a first end having a forked receptacle and a second end having an IDC that is configured to have a conductor terminated in a direction perpendicular to a direction of mating insertion and parallel to a plane defined by the contact. In some embodiments, the connector can also have a shield wrap and an outer cover wherein the shield wrap has a wraparound flange configured to wrap around a wall of the main plug body and a drain wire retention notch configured to allow a drain wire of an inserted cable to wrap around the wraparound flange and be secured between the shield wrap and outer cover.
FIG. 1 is an isometric view of a first embodiment of a single pair ethernet plug.
FIG. 2 is an isometric view of the plug of FIG. 1 with the wire cap removed.
FIG. 3 is an exploded isometric view of the plug of FIG. 1.
FIG. 4 is an isometric view of the contacts of the plug of FIG. 1.
FIG. 5 is an isometric view of the main plug body of the plug of FIG. 1.
FIG. 6 is an isometric view of the wire cap of the plug of FIG. 1.
FIG. 7 is an isometric view of the wire cap of FIG. 6 rotated 180 degrees.
FIG. 8 is an isometric view of the wire cap of FIG. 7 with an inserted communication cable.
FIG. 9 is an isometric view of a shielded version of the plug of FIG. 1.
FIG. 10 is an exploded isometric view of the plug of FIG. 9.
FIG. 11 is an isometric view of the plug of FIG. 9 with the wire cap removed.
FIG. 12 is an isometric view of a second embodiment of a single pair ethernet plug.
FIG. 13 is an exploded isometric view of the plug of FIG. 12.
FIG. 14 is another exploded isometric view of the plug of FIG. 12.
FIG. 15 is an isometric view of the contacts of the plug of FIG. 12.
FIG. 16 is an isometric view of the main plug body of the plug of FIG. 12.
FIG. 17 is an isometric view of the shield wrap of the plug of FIG. 12.
FIG. 18 is an isometric view of the wire cap of the plug of FIG. 12.
FIG. 19 is an isometric view of the wire cap of FIG. 18 rotated 180 degrees.
FIG. 20 is an isometric view of the wire cap of FIG. 19 with an inserted communication cable.
FIG. 21 is an isometric view of the outer cover of the plug of FIG. 12.
FIG. 22 is an isometric view of an unshielded version of the plug of FIG. 12
FIG. 23 is an exploded isometric view of the plug of FIG. 22.
FIG. 24 is an isometric view of the plug of FIG. 12 showing how a drain wire can be terminated.
FIG. 25 is an isometric view of a wire cap that may be used with the present invention having an adhesive label to show polarity.
FIG. 26 is an isometric view of another wire cap that may be used with the present invention having ink based markings to show polarity.
DETAILED DESCRIPTION OF THE DRAWINGS
In one embodiment, the present invention is a single pair ethernet plug based on a fiber LC connector form factor due to its compact size, low cost, and ease of manufacturability. The plug features a snap together toolless termination method for quick installation and ability to be reterminated onto new cable.
FIG. 1 shows a first embodiment of a single pair ethernet plug assembly 20. The single pair ethernet plug assembly 20 has a main plug assembly 22, wire cap 24, and single pair ethernet cable 26.
FIG. 2 shows single pair ethernet plug assembly 20 with wire cap 24 uninstalled. Conductors 28 of cable 26 are shown pressed into contacts 30 of main plug assembly 22. Wire cap 24 is retained to main plug assembly 22 via plug body latches 23 and wire cap pockets 25. This design allows for the wire cap 24 to depress conductors 28 into contacts 30 without the need for any special tools, and in cases of low quantities, can be done by hand.
In one embodiment, the design of the wire cap 24 allows it to be secured to a side of the main plug assembly wherein the side is in a direction perpendicular to a plane defined by the direction of deflection of the latch of the plug.
FIG. 3 shows a fully exploded view of single pair ethernet plug assembly 20. Contacts 30 are inserted into slots 32 of main plug body 34. Barbs 36 of contacts 30 prevent the contacts from pulling out of main plug body 34 by biting into the walls of slots 32 if the contacts are pulled against the direction of insertion.
FIG. 4 shows contacts 30, which include upper contact 38 and lower contact 40. Each contact features front interfaces 42 that engage with the contact pins of active equipment jacks. Insulation displacement contacts 44 pierce the conductor insulation of single pair ethernet cable 26 to establish electrical continuity. Insulation displacement contacts 44 are angled relative to the axes of the conductors 28 of single pair ethernet cable 26 to allow effective cutting of the insulation of conductors 28 without the need for a secondary coining operation to the conductor insertion area 46 to create a cutting edge. Contacts 30 also feature barbs 36 as previously explained in FIG. 3. The lengths of upper contact 38 and lower contact 40 may be equal for electrical balance.
FIG. 5 shows main plug body 34 having front interface area 48 and rear termination area 50. Rear termination area 50 has divider wall 52 to separate contacts 30 to prevent shorting and reduce potential for hi-pot failures between upper contact 38 and lower contact 40. Plug body latches 23 engage with wire cap 24 upon completion of termination. The latches may be disengaged to allow for cable untermination/retermination and plug reuse.
FIGS. 6-8 show detailed views of wire cap 24. Wire cap pockets 25 engage with plug body latches 23. Conductor retention hooks 54 hold conductors 28 in place prior to installation onto main plug assembly 22. Wire cap divider wall 56 prevents insulation displacement contacts 44 from touching each other and creating a short. Ribs 58 push the conductors 28 into the conductor insertion area 46 of insulation displacement contacts 44.
The single pair ethernet plug may be offered in a shielded version for use with applications that require the use of shielded cable.
FIG. 9 shows a single pair ethernet shielded plug assembly 100 having shielded wire cap 102, shielded main plug assembly 106, and shielded single pair ethernet cable 110. FIG. 10 shows an exploded view of single pair ethernet shielded plug assembly 100. Shielded wire cap 102 has wire cap shield 104, while shielded main plug assembly 106 has main plug shield 108. Main plug shield 108 has front portion 112 which contacts the grounding tabs of the active equipment single pair ethernet jack.
FIG. 11 shows a rear view of single pair ethernet shielded plug assembly 100 with shielded wire cap 102 uninstalled. Main plug shield 108 has plug shield tabs 114 that contact both shield braid 116 of shielded single pair ethernet cable 110 as well as the wire cap shield tabs 118 of wire cap shield 104 when installed to create a bonded connection between all three components.
FIG. 12 is an isometric view of a second embodiment of a single pair ethernet plug assembly 220 which includes main plug assembly 222, outer cover 223, wire cap 224, and single pair ethernet cable 226.
FIG. 13 is an exploded view of single pair ethernet plug assembly 220 with outer cover 223 and wire cap 224 uninstalled. Main plug assembly 222 includes contacts 230, main plug body 234, and shield wrap 254.
FIG. 14 is an exploded view of single pair ethernet plug assembly 220. Contacts 230 are inserted into slots 232 of main plug body 234.
FIG. 15 is an isometric exploded view of contacts 230; which include upper contact 238 and lower contact 240. Contacts 230 include front interfaces 242 and insulation displacement contacts 244. Front interfaces 242 engage with the contact pins of active equipment jacks. Insulation displacement contacts 244 pierce the insulation of conductors 227 of single pair ethernet cable 226 to establish electrical continuity. Wire cap 224 aligns conductors 27 (FIG. 20) of single pair ethernet cable 26 with contacts 230 of main plug assembly 222. Insulation displacement contacts 244 are angled relative to the axes of conductors 227 of single pair ethernet cable 226 to facilitate cutting of the conductor insulation without the need for a secondary coining operation to create a cutting edge on insulation displacement contacts 244. Barbs 236 engage into sides of slots 232 of main plug body 234 to retain the contacts within main plug body 234. The lengths of upper contact 238 and lower contact 240 may be equal for electrical balance.
FIG. 16 is an isometric view of main plug body 234. Main plug body 234 includes front interface area 248 and rear termination area 250. Rear termination area 250 has dividing wall 252 to separate contacts 230 to prevent shorting and reduce potential for hi-pot failures between upper contact 238 and lower contact 240. Contact stops 253 of main plug body 234 provide a means of positively locking contacts 230 in main plug body 234 once they are fully inserted. Shield wrap 254 provides grounding from the front interface area 248 to the rear termination area 250. Latch 256 is based on a fiber LC connector latch and locks single pair ethernet plug assembly 220 into a single pair ethernet jack. Ledge 257 of main plug body 234 engages with pocket 275 on wire cap 224 (FIG. 18) to provide side-to-side rigidity when fully assembled. Keyway 258 on main plug body 234 aligns to a key feature on the single pair ethernet jack. The key feature prevents a fiber LC connector from accidentally being installed into a single pair ethernet jack. Shield retention block 260 on main plug body 234 engages with cutout 262 on shield wrap 254 (FIG. 17) to lock shield wrap 254 onto the front interface area 248 of main plug body 234. Cover key 261 engages with keying pocket 290 on outer cover 223 (FIG. 21) to ensure outer cover 223 is installed in the correct orientation.
FIG. 17 is an isometric view of shield wrap 254 in an open position. Flange 264 inserts into keyway 258 of main plug body 234 and locks using barb features 266. The rear portion of shield wrap 254 has a wraparound flange 268 with cable braid retention notch 270 to locate the single pair ethernet shielding braid and provide electrical bonding between the cable braid and plug shield wrap 254. Spring tab 272 makes contact with inside surface 292 of outer cover 223 (FIG. 21) for electrical grounding.
FIG. 18 is an isometric view of wire cap 224. Alignment blocks 274 of wire cap 224 engage with alignment notches 255 of main plug body 234 to guide conductors 227 of single pair ethernet cable 226 prior to termination to avoid damage to contacts 230. Latch 276 on wire cap 224 engages with slot 288 on outer cover 223 to lock outer cover 223 over wire cap 224 and main plug assembly 222 to hold all components together. Pressing latch 276 inward allows the user to remove outer cover 223. Disassembling all components provides the end user with the option to reterminate single pair ethernet plug assembly 220.
FIG. 19 is a rotated isometric view of wire cap 224. Tooth features 280 on strain relief area 278 of wire cap 224 are designed to grip outer jacket 229 of single pair ethernet cable 226 to secure single pair ethernet cable 226 within single pair ethernet plug assembly 220. Conductor passages 282 guide conductors 227 of single pair ethernet cable 226 along the length of wire cap 224 to secure and align conductors 227 with insulation displacement contacts 244 of contacts 230 in main plug assembly 222. Pockets 284 on wire cap 224 provide clearance for the tips of insulation displacement contacts 244 of contacts 230 in main plug assembly 222. Dividing wall 286 on wire cap 224 lines up with dividing wall 252 on main plug body 234 to completely separate conductors 227 of single pair ethernet cable 226.
FIG. 20 is an isometric view of wire cap 224 with conductors 227 of single pair ethernet cable 226 installed. Conductors 227 are inserted into conductor passages 282 and trimmed flush with wall 285 on wire cap 224.
FIG. 21 is an isometric view of outer cover 223. Outer cover 223 is made of die cast metal for shielding and strength. Single pair ethernet cable 226 enters through cable entry area 286 of outer cover 223 prior to termination.
The single pair ethernet plug may be offered in a non-shielded version as a lower cost solution for applications that do not require the performance of a shielded system.
FIG. 22 shows a single pair ethernet unshielded plug assembly 300 which includes wire cap 302, main plug assembly 304, rear cover 306, and unshielded single pair ethernet cable 308.
FIG. 23 shows an exploded view of single pair ethernet unshielded plug assembly 300. In this configuration, main plug assembly 304 does not have a metal shield wrap and rear cover 306 is plastic instead of die cast metal.
FIG. 24 shows single pair ethernet plug assembly 420 with outer cover 423 pulled back to expose the drain wire 431 of single pair ethernet cable 426. Drain wire 431 is pulled back alongside the outer jacket of single pair ethernet cable 426 during cable preparation and inserted into main plug assembly 422. The drain wire is then routed into drain wire retention notch 470 of shield wrap 454 and around the outside of the shield wrap such that when outer cover 423 is moved forward over the main plug assembly, drain wire 431 is captured between outer cover 423 and shield wrap 454 to establish grounding continuity between the cable and plug assembly.
FIG. 25 shows wire cap 424 having adhesive label 425 applied to the outside face of the component. Adhesive label 425 may have colors and/or text to indicate the location of the conductors of single pair ethernet 426 to ensure correct signal polarity.
FIG. 26 shows another method for indicating signal wire routing within wire cap 424. Ink based marking 435 is applied to the inner area of wire cap 424, which aligns with one of the two conductor passages 482 and corresponds to the color of one of the conductors of single pair ethernet cable 246 to indicate signal wire routing. In one embodiment, the contact closest to the latch can have a positive polarity according to IEEE 802.3cg.
While particular embodiments and applications of the present invention have been illustrated and described, it is to be understood that the invention is not limited to the precise construction and compositions disclosed herein and that various modifications, changes, and variations may be apparent from the foregoing without departing from the spirit and scope of the invention as described.
Patent Application
20210151905
