FIELD OF THE INVENTION
The present invention relates generally to electrical connectors and, more particularly, to a three position coaxial cable connector assembly.
BACKGROUND OF THE INVENTION
Radio frequency (RF) coaxial cable connector assemblies have been used for numerous automotive applications, such as global positioning systems (GPS), car radios, mobile phones, air bag systems, and multimedia devices. Coaxial cables typically consist of an outer conductor, an inner conductor, a dielectric, and a jacket. The outer conductor and the inner conductor of the cable often electrically interface with a mating coaxial cable through jack and plug connectors. Such conventional coaxial cable connectors are known in the art, for example, in U.S. Pat. Nos. 6,676,445 and 6,824,403, which are assigned to the assignee of the present invention and are expressly incorporated by reference herein.
Certain automotive applications may require that multiple coaxial cables be coupled through a single connector assembly. For example, three position connector assemblies are often used to electrically couple three coaxial jack connectors with three coaxial plug connectors.
In order to standardize various types of connectors and thereby avoid confusion, certain industry standards have been established. One of these standards is referred to as FAKRA. FAKRA is the Automotive Standards Committee in the German Institute for Standardisation, representing international standardization interests in the automotive field. The FAKRA standard provides a system, based on keying and color coding, for proper connector attachment. Like jack keys can only be connected to like plug keyways in FAKRA connectors. Secure positioning and locking of connector housings is facilitated by way of a FAKRA defined catch on the jack housing and a cooperating latch on the plug housing.
Typically, electrical connector assemblies have retention means in a housing in order to secure the electrical connectors therein. One such retainer is a plastic movable member which is configured to move in place over the connector to lock the connector in place. Some of such movable members are moved transversely to the axial direction, while others are designed as hinged flaps which are rotated into place.
However, prior to insertion of the retention means inside the connector housing to secure the electrical connectors in place, typically the electrical connectors must be aligned within the housing. In other words, if the electrical connectors are not aligned, it is typically not possible to insert the retention means. Further, there is no easy or convenient way to determine whether the electrical connectors have been properly aligned, thus further complicating the installation.
What is needed is an electrical connector housing that easily permits alignment of the electrical connectors and further provides a convenient, consistent manner to determine when the electrical connectors have been properly aligned.
SUMMARY OF THE INVENTION
The present invention relates to a housing for use in an electrical connector assembly. The housing includes a body having at least one axial passageway for receiving an electrical connector. A position assurance device extends into the at least one axial passageway and is configured to engage a shoulder of the electrical connector to restrict axial movement. A secondary position assurance device is received in the body engaging the shoulder of the electrical connector to restrict axial movement of the electrical connector.
The present invention further relates to a housing for use in an electrical connector assembly. The housing includes a body having a first channel for receiving a first electrical connector. A first position assurance device extends into the first channel and is configured to engage a shoulder of the first electrical connector to restrict axial movement of the first electrical connector. The body has a second channel for receiving a second electrical connector. A second position assurance device extends from the second channel and is configured to engage a shoulder of the second electrical connector to restrict axial movement of the second electrical connector. The body has a third channel for receiving a third electrical connector. A third position assurance device extends from the third channel and is configured to engage a shoulder of the third electrical connector to restrict axial movement of the third electrical connector. A secondary position assurance device is received in the body to engage a shoulder of each of the electrical connectors to restrict axial movement of the electrical connectors.
The present invention yet further relates to an electrical connector assembly. The electrical connector assembly includes a housing including a plurality of axial passageways, a transverse slot and a plurality of position assurance devices. A plurality of electrical connectors is configured to be received within the plurality of axial passageways. Each of the electrical connectors includes a shell having a shoulder and an annular groove, each shoulder engaging a corresponding position assurance device. A secondary position assurance device is configured to be received within the transverse slot. The secondary position assurance device includes a plurality of arcuate engagement surfaces, each of the engagement surfaces configured to be received within one of the annular grooves of the shells.
An advantage of the present invention is that electrical connectors can be aligned and secured within a connector housing with position assurance devices.
A further advantage of the present invention is that the position assurance devices are of unitary construction with the connector housing.
A still further advantage of the present invention is that a secondary position assurance device is used with the position assurance device to secure the electrical connectors.
Other features and advantages of the present invention will be apparent from the following more detailed description of the preferred embodiment, taken in conjunction with the accompanying drawings which illustrate, by way of example, the principles of the invention.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a top perspective view of an embodiment of an electrical connector assembly of the present invention.
FIG. 2 is an exploded perspective view of a jack housing and corresponding jack connectors of the present invention.
FIG. 3 is an exploded perspective view of a plug housing and corresponding plug connectors of the present invention.
FIG. 4 is a partial cutaway top perspective view showing plug connectors installed in the plug housing of the present invention.
FIG. 5 is a cross section cutaway of FIG. 1 of the present invention.
FIG. 6 is a cross section of a jack connector taken along line 6-6 of FIG. 1, which is more precisely located by line 6-6 of FIG. 5 of the present invention.
FIG. 7 is a cross section of a plug connector taken along line 7-7 of FIG. 1, which is more precisely located by line 7-7 of FIG. 5 of the present invention.
FIG. 8 is a bottom perspective view of a receiving end of a plug housing taken along line 8-8 of FIG. 3 of the present invention.
FIG. 9 is an exploded perspective view of an embodiment of a plug housing and corresponding plug connectors of the present invention.
Wherever possible, the same reference numbers will be used throughout the drawings to refer to the same or like parts.
DETAILED DESCRIPTION OF THE INVENTION
Referring initially to FIGS. 1-3, an electrical connector assembly 10 according to the present invention includes a jack assembly 12 which is configured to couple to a plug assembly 14. The jack assembly 12 includes a body or jack housing 16 having at least one, and as shown, a plurality of channels or axial passageways 18a, 18b, 18c which define respective longitudinal axes 19a, 19b, 19c and are configured to receive corresponding coaxial cables 20a, 20b, 20c. Coaxial cables 20a, 20b, 20c each include a conventional jack connector 22 that is referred to in the figures as 22a, 22b, 22c.
Plug assembly 14 similarly includes a body or plug housing 24 having a plurality of channels or axial passageways 26a, 26b, 26c (FIG. 7) which define longitudinal axes 27a, 27b, 27c and are configured to receive coaxial cables 28a, 28b, 28c. Each of the coaxial cables 28a, 28b, 28c includes a conventional plug connector 30 that is referred to in the figures as 30a, 30b, 30c. Each plug connector 30 is configured to receive a corresponding jack connector 22 and provide electrical communication between respective cables 20a, 20b, 20c and 28a, 28b, 28c.
It is to be understood that elements, such as jack connector 22 and plug connector 30, are also referred to with an suffix, i.e., 22a, 22b, 22c, 30a, 30b, 30c, and that while an element number without the suffix is intended to collectively refer to the particular element, the terms may be used interchangeably.
With reference to FIGS. 1, 2, and 6, the jack housing 16 includes a front mating end 36 and a rear connector receiving end 38. As shown in FIGS. 1 and 2, the passageways 18a, 18b, 18c each include a cylindrical portion 40 (FIG. 2) adjacent the mating end 36 and a non-cylindrical, illustratively hexagonal, portion 42 (FIGS. 1 and 6) adjacent the connector receiving end 38 (FIG. 2). FIG. 6 is a cross section of jack assembly 12 taken along line 6-6 of FIG. 1, the location of line 6-6 with respect to jack assembly 12 being more precisely located as shown in FIG. 5. Passageways 18a, 18b, 18c are positioned such that the hexagonal portions 42 facilitate efficient space utilization. More particularly, each hexagonal portion 42 includes six planar walls or flats 43, wherein at least one of the flats 43 of each hexagonal portion 42 extends parallel to and in close proximity to one of the flats 43 of an adjacent hexagonal portion 42. The proximity of parallel flats 43 conserves space by closely positioning the longitudinal axes 19 of the axial passageways 18. In the illustrative embodiment, each hexagonal portion 42 shares a pair of flats 43 with the two adjacent hexagonal portions 42.
Referring to FIGS. 1 and 4-7, jack housing 16 and plug housing 24 each include a plurality of connector position assurance devices (CPA) 32. Each CPA 32 includes a retainer 33, such as a hook, for securing a corresponding shoulder 56 (FIG. 2) of jack connectors 22a, 22b and 22c. As shown in FIG. 6, a retainer 33 of a corresponding CPA 32 is inwardly biased from each of passageways 18a, 18b and 18c to secure each of shoulders 56a, 56b and 56c. As shown in FIG. 7, a retainer 33 of a corresponding CPA 32 is inwardly biased from each of passageways 26a, 26b and 26c to secure each of shoulders 90a, 90b and 90c. In order to maximize the retention of shoulders 56a, 56b, 56c, 90a, 90b and 90c, each retainer 33 is disposed to engage the shoulders along a junction, i.e., corners, between adjacent flats of the respective hexagonal portions of the hexagonal peripheries of the shoulders. As shown, to ensure engagement along the corners of the shoulders 56a, 56b, 56c, 90a, 90b and 90c is achieved, the desired alignments of the shoulders are maintained by the selective positioning (or rotation) (or clocking) of the hexagonal connectors including shoulders 56a, 56b, 56c, 90a, 90b and 90c to engage (or mate) axial hexagonal passageways 18a, 18b, 18c, 26a, 26b, 26c formed in respective jack housing 16 and plug housing 24 into which the hexagonal connectors are inserted.
In one embodiment, as shown in FIG. 1, the upper CPAs 32 can be accessed by insertion of a tool (not shown) though notched openings 100 formed to further enlarge axial passageways 18a and 18b. In a preferred embodiment, the tool is a blade screwdriver. Such insertion and access by the tool would be substantially parallel to the corresponding axial passageway. It is to be understood that while CPAs 32 are shown (FIGS. 6 and 8) with two of the three CPAs adjacent the outer surface of housings 16 and 24 and one CPA centrally disposed substantially in the housings, a CPA can be located at any position in the housings to secure a shoulder of a connector. For example, in one embodiment, a single CPA could contain an enlarged retainer that could be used to secure more than one connector, such as a centrally disposed CPA in either FIG. 6 or 7. By virtue of the CPAs, each corresponding connector is secured in desired alignment and permitting insertion of a secondary connector position assurance device (SCPA) 46, as shown in FIGS. 2 and 3, and discussed in additional detail below. In one embodiment, CPA 32 produces an audible clicking sound to confirm secure engagement with the corresponding connector has been achieved. In addition, as shown in FIG. 1, actuation of the CPA 32 is also visually verifiable.
Although CPAs could be separate components that are fastened, adhered or otherwise connected to the connector housings, in one embodiment, the CPAs are of unitary construction with the housings.
As shown in FIGS. 1 and 2, in addition to axial passageways 18a, 18b, 18c, the jack housing 16 includes a transverse slot 44 configured to slidably receive a lock or secondary connector position assurance device (SCPA) 46. With reference to FIGS. 2, 5 and 6, the SCPA 46 includes a first leg 48, a second leg 50, and an arcuate bridge member 52 connecting the first leg 48 and the second leg 50. A first arcuate engagement surface 54 is supported by the first leg 48 and is configured to engage a shoulder 56a (FIG. 6) of the first jack connector 22a to restrict axial movement of the first jack connector 22a. Similarly, a second arcuate engagement surface 58 is supported by the second leg 50 and is configured to engage a shoulder 56b of the second jack connector 22b to restrict axial movement of the second jack connector 22b. A third arcuate engagement surface 62 is supported by the bridge member 52 and is configured to engage shoulder 56c of the third electrical connector 22c to restrict axial movement of the third electrical connector 22c.
The first engagement surface 54 has a first radius of curvature, the second engagement 58 has a second radius of curvature and the third engagement surface 62 has a third radius of curvature. In one illustrative embodiment, the third radius of curvature is greater than both the first radius of curvature and the second radius of curvature, such as to facilitate positioning of a larger jack connector 22c within the axial passageway 18c.
First latch arm 66 extends upwardly from an extension 102 adjacent to bridge member 52 such that first leg 48 is disposed between second leg 50 and first latch arm 66. Similarly, second latch arm 68 extends upwardly from an extension 102 adjacent to bridge member 52 such that second leg 50 is disposed between first leg 48 and second latch arm 68. First latch arm 66 includes a latch 67 that is configured to engage a recess 70 to secure SCPA 46 to the jack housing 16. Second latch arm 68 includes a latch 69 that is configured to engage a recess 71 to secure SCPA 46 to the jack housing 16. The first and second latch arms 66 and 68 are illustratively formed as an integral part of the SCPA 46 and are resiliently biased in a direction away from each other. More particularly, the latches 67 and 69 are biased outwardly to couple the SCPA 46 to respective recesses 70 and 71 defined by an internal wall 78 of the jack housing 16 (FIG. 6). A pair of slots 79a and 79b are illustratively positioned at opposing ends of extensions 102 of bridge member 52 and are configured to receive a tool (not shown) for facilitating removal of the SCPA 46 from the housing 16.
Referring back to FIGS. 1, 2 and 6, jack connectors 22a, 22b, 22c each include known coaxial components for establishing electrical connections therethrough and are not discussed in further detail. The housings of jack connectors 22a, 22b, 22c each include radially outwardly extending flanges or shoulders 56 and 60 which define an annular groove 64 therebetween. In one embodiment, groove 64 includes a cylindrical cross section. Shoulders 56 and 60 illustratively have a hexagonal cross section and are configured to cooperate with the hexagonal portion 42 of the axial passageways 18a, 18b, 18c when the jack connectors 22 are inserted into jack housing 16. When jack connectors 22 are completely installed, annular groove(s) 64 of jack connectors 22 align with transverse slot 44 of the jack housing 16 and SCPA 46 may be installed to verify proper installation and prevent separation. The engagement surfaces 54, 58, 62 of the SCPA 46 are configured to be received within the grooves 64 such that engagement with the shoulders 56 and 60 restricts axial movement of the jack connectors 22a, 22b, 22c.
With reference to FIGS. 2-4, plug housing 24 includes a front mating end 80 and a rear connector receiving end 82. The mating end 80 includes a receiving flange 84 configured to slidably receive the mating end 36 of the jack housing 16. The jack housing 16 includes a plurality of alignment ribs 86 which are configured to be received within alignment grooves 88 formed within the plug housing 24. By ensuring such positioning, the passageways 18 of the jack housing 16 are coaxially aligned with the passageways 26 of the plug housing 24. In one embodiment, jack housing 16 can include one alignment rib 86.
Referring to FIGS. 1, 4, 5 and 7, the passageways 26a, 26b, 26c each include a cylindrical portion 106 adjacent to the mating end 80 and a non-cylindrical, illustratively hexagonal, portion 108 adjacent the connector receiving end 82 (FIG. 4). As shown, passageway 26c is positioned vertically above passageways 26a and 26b and is laterally offset therefrom. In such an arrangement, the hexagonal portions 108 facilitate efficient space utilization by placing the passageways 26a, 26b, 26c in close proximity to each other. More particularly, each hexagonal portion 108 includes six flats 142, wherein at least one of the flats 142 of each hexagonal portion 108 extends parallel to and in close proximity to one of the flats 142 of an adjacent hexagonal portion 108. The proximity of parallel flats 142 conserves space by closely positioning the longitudinal axes 27 of the axial passageways 26. In the illustrative embodiment, each hexagonal portion 108 shares flats 142 with the two adjacent hexagonal portions 108. In addition to the axial passageways 26, the plug housing 24 includes a transverse slot 144 (FIG. 3) configured to slidably receive a connector position assurance device (SCPA) 46′. SCPA 46′ is illustratively identical to the SCPA 46 described in detail above.
Referring back to FIGS. 1, 3 and 7, plug connectors 30a, 30b, 30c each include known coaxial components for establishing electrical connections therethrough and are not discussed in further detail. The housings of plug connectors 30a, 30b, 30c each include radially outwardly extending flanges or shoulders 90 and 92 which define an annular groove 94 therebetween. In one embodiment, groove 94 includes a cylindrical cross section. Shoulders 90 and 92 illustratively have a hexagonal cross section and are configured to cooperate with the hexagonal portion 142 of the axial passageways 26a, 26b, 26c. The engagement surfaces 54, 58, 62 of the SCPA 46′ are configured to be received within the grooves 94 such that engagement with the shoulders 90 and 92 restricts axial movement of the jack connectors 30a, 30b, 30c.
In an alternate embodiment, as shown in FIG. 8, which is a bottom perspective view of receiving end 82 of plug housing 24, axial passageway 26c is circular. That is, instead of shoulders 90 and 92 (FIG. 3) being hexagonal, shoulders 90 and 92 are circular (FIG. 9). This construction permits a larger cable to be used with plug connector 30c (FIG. 3). Use of larger diameter cables can result in high torque forces that are associated with twisting of the larger diameter cables, i.e., plug connector 30c within passageway 26c, during routing of the plug housing 24 in the desired application. By virtue of both plug connector 30c and passageway 26c being circular, plug connector 30c can rotate within passageway 26c, thus relieving and removing the high torque forces that would otherwise occur if the plug connector 30c were constrained from rotational movement. It is to be understood that any of passageways 26a, 26b, 26c, 18a, 18b and 18c of either plug housing 24 (FIG. 7) or jack housing 16 (FIG. 6) can utilize circular constructions, if desired. It is also to be understood that the plug connectors and jack connectors can be of different sizes, so long as the mating plug and jack connectors are suitably sized.
As shown in FIG. 1, a latch 146 may be configured to releasably couple the jack housing 16 with the plug housing 24. More particularly, a catch 148 (FIG. 2) supported by the jack housing 16 may be positioned within an opening 150 (FIG. 3) supported by the plug housing 14 to secure together the jack assembly 12 and plug assembly 14.
It is to be understood that inserts (not shown) shaped similar to the plug and jack connectors can be inserted into a corresponding axial passageway(s), to convert the three position connector assemblies to a two position or even one position connector assembly, if desired. Alternate suitable means to connect jack housing 16 and plug housing 24 are known to those skilled in the art.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from the essential scope thereof. Therefore, it is intended that the invention not be limited to the particular embodiment disclosed as the best mode contemplated for carrying out this invention, but that the invention will include all embodiments falling within the scope of the appended claims.
Patent Grant
7347745
