Patent Application
20060068625
1. Field of the Invention
The present invention relates generally to connectors, and more particularly to sealed electrical and fiber optic connector assemblies.
2. Description of the Related Art
Sealable electrical connectors typically have a plug assembly that removably couples with a connector housing to provide a sealed engagement between the plug assembly and the connector housing. Engagement of the plug assembly and the connector housing provides an electrical connection between a cord, cable, or other such electrical conductor located typically within a room or other area and one or more wires of a cord or cable or other electrical conductor located typically behind a wall. A sealable electrical connector can be used in a room or area having an adverse environment such that when the plug assembly and connector housing of the sealable electrical connector are fully engaged in a sealed condition, associated electrically conductive elements such as tines or other type of electrical conductors being located either within the electrical connector or on the other side of a wall of the room are protected from hostile environmental elements. If nonsealable electrical connectors were used in these adverse environments, a potential exists that the nonsealable electrical connectors may expose associated electrically conductive elements to one or more harmful materials such as fluids, particulates, or other materials. These harmful materials could include gas vapors, particulates or liquids, which may produce explosions, short electrical circuits, or cause other detrimental effects.
Conventional approaches to implementing sealable electrical connectors can still require a level of care and a certain level of accommodation that may not be available under certain circumstances. As such, the conventional sealable electrical connectors may not be in a sealed condition unbeknownst and despite the best intentions of those associated with their use. For instance, users may not realize that certain caps, housings, or other sorts of enclosures of conventional sealable connectors need to be twisted, pushed, screwed or otherwise secured to a degree beyond what may appear to a particular uninformed user as being fully engaged to provide the sealed condition. In particular, a plug assembly may be partially unscrewed from a connector housing due to poor installation practice or may become partially disengaged during operation to cause an unsealed condition that most likely would be difficult to detect until a failure results. Discovery of this unsealed condition may be difficult since the partially disengaged condition may upon casual inspection falsely appear to be the fully engaged, sealed condition.
In other instances, external electrical cords or cables coupled to a sealed conventional sealable electrical connector may become entangled with a passerby causing a pulling force to be temporarily imparted on to the conventional sealable electrical connector thereby producing a temporary unsealed condition that may not ever be noticed or may be noticed through the resultant serious harm caused. Vibrations found in some environments, such as from nearby machinery, may also cause a force on the conventional sealable electrical connector that produces an unsealed condition. This may cause the conventional sealable electrical connector to repeatedly cycle from being unsealed to being sealed back to being unsealed based upon the frequency and amplitude of the vibrations found in the vicinity of the connector. This cycling unsealed condition may never be discovered until it is too late and the harm has been caused.
Conventional approaches have not sufficiently anticipated these or other events that can cause long term, temporary, and cycling unsealed conditions in conventional sealable electrical connectors. Consequently, although the conventional sealable connectors may appear to provide a seal, in realty they may not always be sealed. Conventional sealable electrical connectors may not provide a sufficient barrier between electrically conductive elements and hostile environmental elements when used within adverse environments. Similar problems exist for conventional fiber optic connectors used in adverse environments.
The present invention resides in a connector assembly for use with a first connector configured to be operably coupled to a second connector and a housing with an inner surface extending along a first dimension to at least partially define an inner space and an open end to provide access to the inner space, the second connector being at least partially located within the inner space of the housing for access therewith through the open end of the housing. The connector assembly includes a body configured to receive the first connector, with the body being sized to be inserted at least partially into the inner space of the housing through the open end of the housing. The body has an outer surface. The connector assembly further includes a sealing member sealingly contacting both the outer surface of the body and the inner surface of the housing as the body is moved from a first position to a second position along the first dimension of the housing to provide a seal between the inner surface of the housing and the outer surface of the body.
In one illustrated embodiment of the invention, the connector assembly is configured for use with a housing with an end surface extending about the inner space toward the open end. In this embodiment, the body is sized to be inserted into the inner space of the housing through the open end of the housing to a fully inserted position whereat the first connector is operably coupled to the second connector of the housing. The body has first and second outer surfaces, with the first outer surface extending about and positioned outward of the second outer surface. The connector assembly further includes first and second sealing members.
The first sealing member is positioned at the first outer surface of the body and positioned for sealing contact with the end surface of the housing and the first outer surface of the body to provide a first seal between the housing and the body when the body is inserted into the housing and in the fully inserted position. The second sealing member sealingly contacts both the second outer surface of the body and the inner surface of the housing as the body is moved from the fully inserted position to a less than fully inserted position along the first dimension of the housing to provide a second seal between the housing and the body at all positions between the fully inserted position and the less than fully inserted position. The less than fully inserted position is defined as being spaced apart from the fully inserted position sufficient that the first outer surface of the body and the end surface of the housing are sufficiently distance that the first sealing member does not provide the first seal between the housing and the body. The second sealing member may be an O-ring, and the second outer surface may have a groove extending thereabout with the O-ring positioned therein.
Other features and advantages of the invention will become apparent from the following detailed description, taken in conjunction with the accompanying drawings.
A robust sealable electrical or fiber optic connector usable in industrial and other settings has a first connector assembly to couple wire or fiber conductors of a cable typically within a room or other area to wire or fiber conductors behind or in a wall through a second connector assembly typically mounted on the wall. When the first and second connector assemblies of the robust sealable connector are engaged they provide a sealed condition such that associated electrically or light conductive elements such as tines or other type of conductors found either within the robust sealable connector or behind a wall of the room are protected from potentially hazardous elements existing within the room or other area external to the sealable connector. In addition, the robust sealable connector can provide a fully sealed condition even when the first connector assembly is partially disengaged from the housing for the second connector assembly or when a pulling force is imparted such as when a passerby becomes entangled with an associated cord or cable or as a result of vibration. By way of background, a convention sealable electrical connector is first described.
A conventional sealable electrical connector 10 designed for industrial uses is shown in
The forward portion 15 of the connector housing 16 has an inner surface 26, a front end wall surface 28, and an exterior surface 30. The exterior surface 30 has engagement slots 32 formed therein and all shaped to promote tight coupling of the plug assembly 14 with the connector housing 16.
The plug assembly 14 has a contact plug 34, shown as an RJ45 plug, with contacts 36 configured to engage with the tines (not shown) of the contact jack 18 of the connector housing 16. The contact plug 34 is positioned within an aperture in a cover or cap body 38 of the plug assembly 14 having a front portion 39 shaped and sized to be inserted into the connector housing 16 as the contact plug 34 engages with the contact jack 18 and makes electrically contact therewith. Typically, the front portion 39 is partially cylindrically shaped to match the cylindrical shape of the inner surface 26 of the connector housing so as to be snugly inserted with a small clearance between the front portion 39 and the inner surface 26. Of course, the inner surface 26 of the connector housing 16 extends along the longitudinal dimension of the connector housing a sufficient distance to define an inner space sized to receive at least a portion of the cap body 38 therein and the front end wall surface 28 defines an opening through which the cap body is inserted.
The plug assembly 14 further includes a cover or cap 40 that is shaped to slip over the connector housing 16 and has interiorly projecting engagement lugs or members 50 (one shown in
The contact jack 18 is mounted to the jack assembly 12 and projects interior of the inner surface 26 of the connector housing 16 from the wall side 22 of the wall plate 20. The contact jack 18 is electrically coupled to the contact plug 34 when the plug assembly 14 is fully coupled to the jack assembly 12, thus electrically coupling the first set of wires in the cable 42 to the second set of wires. The front portion 39 of the cap body 38 is shown in a fully inserted position in the inner space defined by the inner surface 27 of the connector housing 16 in
The cap body 38 has a flange portion 53 located between the front portion 39 and a rear portion 54 of the cap body to which the cable retainer 44 is attached. A gasket 52 extends around the front portion 39 of the cap body 38 adjacent to the flange portion 53 such that when the plug assembly 14 is coupled to the jack assembly 12, as shown in
The rear portion 54 of the cap body 38 projects rearward through a central aperture of the cap 40 such that once the cap body is positioned with the flange portion 53 at the front end wall surface 28 of the connector housing 16, with the gasket 52 positioned therebetween, the cap can be slid forward toward the connector housing along the rear portion of the cap body and rotated to move the engagement members 50 to the end portions 33 of the engagement slots 32. A wave washer spring 55 is located between an inner end surface 56 of the cap 40 and a rearward surface 57 of the cap body 38, adjacent to the flange portion 53. The spring 55 becomes partially compressed when the cap 40 is moved into the secured position holding the cap body 38 in engagement with the connector housing 16, thereby biasing the flange portion 53 toward the front wall surface 28 of the connector housing, with the gasket 52 positioned therebetween, to place the plug assembly 14 in a sealed condition with the jack assembly 12.
In a first exemplary situation shown in
In a second exemplary situation shown in
A robust sealable connector 100 according to the present invention is shown in
The robust sealable electrical connector 100 has a first connector assembly and a second connector assembly which, for the purposes of describing the illustrated sealable electrical connector, are referred to herein as a plug assembly 102 and the jack assembly 12, respectively. The plug assembly 102 includes a cover or cap body 104 with a modified front portion 106 and a sealing member 108 positioned to extend circumferentially around the modified front portion. The modified front portion 106 is shaped and sized to accommodate the location and the type of the sealing member 108 selected for use so that both the modified front portion and the sealing member will fit snugly into the connector housing 16. In the implementation depicted in
In the depicted implementation, the sealing member 108 is an O-ring such as provided by the Parker Hannifin Corporation. In other implementations the sealing member could be multiple O-rings or seal other than an O-ring such a pliable sheet layered onto the front portion 106 of the cap body 104. To accommodate a layered pliable sheet, the modified front portion 106 would be sized to have an overall reduction in its outer diameter to maintain the ability to fit the modified front portion with the sealing member thereon within the connector housing 16 and provide a seal therebetween. In an alternative not illustrated, the sealing member 108 could be replaced or supplemented with a sealing member affixed to the connector housing 16 along the inner surface 26 thereof, and the front portion 106 plug assembly 102 would have a smooth wall surface at least along the lengthwise portion thereof sealingly engaged by the sealing member of the connector housing as the plug assembly is inserted into the forward portion 15 of the connector housing.
When the plug assembly 102 is fully engaged with the jack assembly 12, the gasket 52 abuts against the front end wall surface 28 of the connector housing 16 to provide for a sealed condition for the robust sealable electrical connector 100 in a manner similar to that described above for the conventional sealable electrical connector 10. However, the sealing member 108 provides an additional seal between the modified front portion 106 and the inner surface 26 of the connector housing 16 to maintain seal therebetween even should the gasket 52 fail to maintain the sealed condition and a gap develops between the gasket and the front end wall surface 28 of the connector housing 16 which as described above would otherwise produce a gap G1 or G2 and result in an unsealed condition. Instead, even if such a gap develops, the sealing member 108 will continue to maintain the sealed condition of the plug assembly 14 with the jack assembly 12. If the plug assembly 102 is not in a fully inserted position may be spaced apart from the fully inserted position sufficient that the flange portion 53 of the cap body 104 and the front end wall surface 28 of the connector housing 16 are sufficiently distance that the gasket 52 does not provide a seal between the connector housing and the cap body. Yet, in such a position while the plug assembly 102 is still at least partially inserted, the second seal provided by the sealing member 108 between the connector housing 16 and the cap body 104 will be maintained.
For instance, if the robust sealable electrical connector 100 were in the first exemplary situation (described above for the conventional sealable electrical connector 10), the force F would still produce the gap G1 between the gasket 52 and the front end wall surface 28 of the connector housing 16 as shown in
As another example, if the robust sealable electrical connector 100 were in the second exemplary situation (described above for the conventional sealable electrical connector 10), the plug assembly 102 would still become partially disengaged from the connector housing 16 and produce the gap G2. As described above, this results when the engagement members 50 of the cap 40 still engage the engagement slots 32 of the connector housing 16 but are not located at the end portions 33 of the engagement slots. While the gap G2 would still result between the gasket 52 and the front surface 28 of the connector housing 16 as shown in
The size of gap G1 and G2 that can be tolerated with the sealing member 108 still maintaining the sealed condition depends on the length of the inner surface 26 of the connector housing 16 engaged by the sealing member as the plug assembly 102 is moved rearward from its normal fully engaged position with the connector housing.
As can be readily understood, the sealing member 108 overcomes the deficiencies of the conventional sealable electrical connector 10 and provides a connector 100 with a dual seal between the plug assembly 102 and the jack assembly 12 that is better suited for use in adverse environments where hostile environmental elements might otherwise penetrate the connector and degrade or disable its electrical performance. The connector 100 is well suited for use as part of an industrial patch cord housing where exposure to fluids, particulates, and other materials are possible and likely. While the robust sealable electrical connector 100 of the present invention is illustrated with the contact plug 34 of the plug assembly 102 shown as an RJ45 plug and mating contact jack 18, the connector may be designed for other style mating electrical plugs and jacks, and as noted above may be used as a robust sealable optical connector with a variety of styles of fiber optic connectors. Further, while the robust sealable electrical connector 100 has been illustrated with a plug assembly 102 (the first connector assembly) holding a plug 34 and the jack assembly 12 (the second connector assembly) holding a jack 18, the positions of the plug and jack could be reversed within the two connector assemblies from that illustrated if desired with appropriate modifications to the connector assemblies so that they adequately retain the plug and jack therein. Of course, when the robust sealable connector is used for optical fibers, the optical plug and receptacle can be retained within either one of the two connector assemblies, as desired.
It will therefore be readily understood by those persons skilled in the art that the present invention is susceptible of broad utility and application. Many embodiments and adaptations of the present invention other than those herein described, as well as many variations, modifications and equivalent arrangements, will be apparent from or reasonably suggested by the present invention and the foregoing description thereof, without departing from the substance or scope of the present invention. Accordingly, while the present invention has been described herein in detail in relation to its preferred embodiment, it is to be understood that this disclosure is only illustrative and exemplary of the present invention and is made merely for purposes of providing a full and enabling disclosure of the invention. The foregoing disclosure is not intended or to be construed to limit the present invention or otherwise to exclude any such other embodiments, adaptations, variations, modifications and equivalent arrangements, the present invention being limited only by the claims appended hereto and the equivalents thereof.
