Patent Application
20090221177
The invention relates to a connector for terminating an electrical cable. More particularly, the invention relates to an annular segmented gland chuck for engaging and securing a cable.
Wedged bushing and chuck systems are used in connectors as a means of restraining and securing cables in the connectors. The chuck is a solid rigid device which tangentially engages the cable, where the chuck compresses about the cable jacket in order to prevent it from slipping or dislodging from the connector. Upon tightening of the connector, often times the chuck permanently damages the cable jacket and may also compromise the conductor within. Further, as the chuck is rigid, many chuck sizes must be purchased and stocked in order to suit a wide range of cable diameters.
Thus, there exists a need in the art to secure and retain a range of cables at an electrical termination site efficiently and effectively while preventing damage to the cable jacket and conductor within.
A first aspect of the invention provides a connector for terminating an electrical cable. The connector includes: a connector body having a cable receiving end and an opposed cable egressing end and an axial bore extending therethrough; a compression nut attachable to the cable egressing end; and an annular segmented gland chuck for engagement with the cable for securing the cable within the body upon attachment of the compression nut to the connector body. The segmented chuck includes an annular base and a plurality of circumferentially spaced chuck segments extending from the base, each the chuck segment being axially deflectable about a base hinge which is perpendicular to the axis and being circumferentially deflectable towards the axis about a segmented hinge parallel to the axis.
A second aspect of the invention provides a connector for terminating an electrical cable. The connector includes: a connector body having a cable receiving end and an opposed cable egressing end and an axial bore extending therethrough; a compression nut attachable to the cable egressing end; and an annular segmented gland chuck for engagement with the cable for securing the cable within the body upon attachment of the compression nut to the conduit body. The segmented chuck includes an annular base having a plurality of circumferentially spaced chuck segments extending from the base, each of the chuck segment removably attached about the annular base to accommodate different-sized cables.
These and other features of the invention will be better understood through a study of the following descriptive and accompanying drawings.
The present invention provides a connector for terminating electrical cables. Typically, long cables or conduit carrying conductors must be terminated at various sites, including for example, conduit boxes and junction boxes. Connectors are compressed around an end of the cable or conduit to terminate it to a box.
The present invention provides a connector which accommodates a range of cables and provides strain relief, preventing the cable from slipping or pulling out the box while maintaining the cord structural integrity and preventing damage thereto. Further, the present invention is configured to accommodate, secure, and retain a large range of cable diameter sizes with a single electrical connector fitting.
The segmented gland chuck 16 includes base 18 and a plurality of removable circumferentially spaced chuck segments 20 extending from the base 18. Base 18 may be composed of one or more materials such that the base 18 is pliable or otherwise elastomerically deformable with respect to the body 12 and around the cable. For example, the base 18 may be composed of polymer, plastic, or rubber. As such, the base 18 may cooperate with the body 12 and the compression nut 14 to create and maintain a tight environmental seal and restraining grip around the cable. Base 18 is shown as being a separate unitary annular ring but base 18 may itself be segmented or base 18 may comprise part of connector body 12.
Each of the chuck segments 20 extending from the annular base 18 is deflectable about a base hinge 22. The base hinge 22 allows movement about an axis that is generally perpendicular to the axis A of the bore. In such a fashion, the chuck segment 20 is circumferentially deflectable towards the axial bore 12a to engage the cable. Also, each of the chuck segments 20 also has a segmented hinge 24 that allows movement of chuck segments 20 about an axis parallel to the axis A. As such, the chuck segment 20 is also longitudinally deflectable along the cable towards axial bore 12a.
The chuck segment 20 may optionally include a first uneven face 26 on its innermost surface. The first uneven face 26 is configured to frictionally engage a portion of the cable upon tightening the connector 10. The first uneven face 26 may be of any configuration which may promote frictional engagement of the cord and/or maximizing the surface area over which the compressive force is applied to the cord. For example, the first uneven face 26 may be, a raised ridge and valley configuration 28, as is shown in the figures, a raised rib pattern (not shown), a raised waffle pattern (not shown), or the like.
The chuck segment 20 optionally has a second uneven face 30 on the exterior thereof. The second uneven face 30 is configured to frictionally engage a portion of the compression nut 14 upon tightening of the connector 10. The second uneven face 30 may be of one or more patterns, including a raised-ribbed configuration, as is shown in the Figures. Optionally, the chuck segment 20 may be pliable in order to encourage chuck segment deformation about the hinges (22, 24) in order to pivot about two separate axes so as to engage the cable.
Further still, the connector 10 includes a removably attachable chuck segments 20, which removably hingeably attach to the annular base 18. Thus, the chuck segment 20 includes an anchor 32 and the annular base 18 includes a corresponding retaining hole 34. The anchor 32 and the hole 34 provides a cooperative detent to lock, and securely retain the chuck segment 20 to the annular base 18. As such, the annular base 18 of the connector 10 may include a plurality of corresponding retaining holes 34 to allow a user to attach a plurality of the chuck segments 20 via respective anchors 32. Each chuck segment 20 may have one or more anchors 32, as is shown in the Figures. This modular conformation of the present invention allows for few or many chuck segments 20 to be employed on the annular base 18 such that cables of various sizes can be secured and retained by the connector 10.
Optionally, the segmented gland chuck of the present invention may have chuck segments 20 with dual hinges (22, 24), removably attachable chuck segments 20 via chuck segment anchors 32 and corresponding annular base retaining holes 34, or a combination thereof.
The various embodiments of the present invention enable the electrical connector to apply radial retention pressure on the cable about two different axes of movement. As shown in the Figures, the chuck segments 20 employed in the electrical connector 10 may be hinged (22, 24) such that the chuck segments 20 pivot and wrap around the cable to maximize the surface area of contact between the chuck segments 20 and the cable. Additionally, as shown in the figures, the chuck segments may be of a wedge shape in order further maximize the chuck segment 20 contact surface area to the cable.
The various elements and features of the present invention allows for connector 10 to retain the cable while spreading out the compressive force along the surface of the chuck segments 20 in order to prevent damage to the cable jacket and conductor of the cable. Thus, the chuck segment 20 is configured to pivot inwardly radially about hinge 22 so as to engage the cord, and also pivot or fold longitudinally along the cord about hinge 24 so as to wrap around the cord. This arrangement now makes it possible to accommodate a larger variety of cords.
The uneven face 26 of the chuck segment 20 offers advantageous restriction against cable pull-out from the termination site by distributing the compression pressure among many hills and valleys of the surface instead of creating a big dent or dig in the cable which may tear the jacket or otherwise damage the conductor within.
Also, the present invention may be configured to employ a modular design with removably attachable chuck segments 20. Various numbers of chuck segments 20 may be attached to the annular base 18 of the segmented gland chuck 16 in order to configure to cables of varying diameters. Thus, the modular design allows for a single annular base 18 and preferably a multitude of chuck segments 20 that are sized and dimensioned to be employed in fitting a wide range of cables for a single fitting. That is, identical segments may be added or removed in order to accommodate cables of different sizes. For example, a user may install three, four, or five chuck segments 20, as needed, to create a proper fit for a large range of cables. The electrical connector 10 of the present invention eliminates the need to purchase and store various-sized electrical connectors and components thereof.
With the modular concept, the electrical connector embodiments of the present invention may in turn have an increased safety fitting for use with tray cable and portable cord. The modular concept also minimizes the tooling investment by reducing the number of different sized chucks that must be purchased and stocked.
A number of embodiments of the invention have been described. Nevertheless, it will be understood that various modifications may be made without departing from the spirit and scope of the invention. Also, the features and elements described above may be modified in various than described above, where appropriate. Accordingly, alternative embodiments are within the scope of the following claims.
This application claims priority to U.S. Provisional Patent Application No. 61/032,168 filed on Feb. 28, 2008, the contents of which are incorporated herein by reference in entirety.
| Number | Date | Country | |
|---|---|---|---|
| 61032168 | Feb 2008 | US |
