1. Field of the Invention
The present invention relates to electrical connector plugs, and more particularly to a cable connector plug used in a connector for transmitting audio signals or other signals.
2. Discussion of the Related Art
The first contact 11 includes a contact portion 110, an extension portion 111 extending rearwardly from the contact portion 110 along an axis of the cable connector plug 10, and a rear portion 112 extending rearwardly from the extension portion 111. The second and third contacts 12, 13 respectively include an annular contact portion 120, 130, a cylindrical extension portion 121, 131 extending rearwardly from the contact portion 120, 130, and a rear portion 122, 132 extending from the extension portion 121, 131. The fourth contact 14 includes a cylindrical contact portion 140, an annular extension portion 141 extending rearwardly from the contact portion 140, and a rear portion 142 extending from the extension portion 141. The extension portions 111, 121, 131, 141 of the first, second, third, and fourth contacts 11, 12, 13, 14 are coaxially arranged in that order from an inside to an outside of the cable connector plug 10. Accordingly, diameters of the extension portions 111, 121, 131, 141 increase in that sequence. The contact portions 110, 120, 130, 140 of the contacts 11, 12, 13, 14 are insulated from each other by a plurality of annular insulating ring portions (not labeled) of the insulators 15. The extension portions 111, 121, 131, 141 of the contacts 11, 12, 13, 14 are insulated from each other by a plurality of cylindrical portions (not labeled) of the insulators 15.
The rear portion 112 of the first contact 11 extends rearwardly beyond the insulators 15 for soldering with a first wire (not shown) of a cable (not shown). A rearmost part of the rear portion 122 of the second contact 12 is exposed for soldering with a second wire (not shown) of the cable. The other part of the rear portion 122 of the second contact 12 is embedded between the corresponding insulators 15. A rearmost part of the rear portion 132 of the third contact 13 is exposed for soldering with a third wire (not shown) of the cable. The other part of the rear portion 132 of the third contact 13 is embedded between the corresponding insulators 15. The rear portion 142 of the fourth contact 14 extends perpendicularly outward from the insulator 15 that is between the third and fourth contacts 13, 14, and is for soldering with a fourth wire (not shown) of the cable.
Generally, surfaces of the second contact 12 are smooth surfaces. When the cable connector plug 10 is inserted into a mating socket of a housing of a complementary connector and rotated relative to the housing, the second contact 12 may easily slide and/or rotate relative to the first contact 11. When this happens, a binding strength as between the first and second contacts 11, 12 is reduced. Thus the cable connector plug 10 is liable to loosen and malfunction or even break apart.
What is needed, therefore, is a new cable connector plug which can overcome the above-described shortcomings.
A cable connector plug according to a preferred embodiment includes a first contact, a second contact and a first insulator portion. The first contact and the second contact are insulated from each other by the first insulator portion. The second contact includes an annular contact portion, the annular contact portion surrounding the first insulator. The annular contact portion includes a first anti-rotation member defined at an inner side thereof, and the insulator portion is engaged with the first anti-rotation member such that the annular contact portion cannot rotate relative to the first insulator portion.
Other novel features and advantages will become more apparent from the following detailed description of various embodiments, when taken in conjunction with the accompanying drawings.
The components in the drawings are not necessarily drawn to scale, the emphasis instead being placed upon clearly illustrating the principles of the present cable connector plug. Moreover, in the drawings, like reference numerals designate corresponding parts throughout the several views, and all the views are schematic.
Reference will now be made to the drawings to describe preferred embodiments of the present cable connector plug, in detail.
Referring to
The second and third contacts 22, 23 respectively include an annular contact portion 220, 230, a cylindrical extension portion 221, 231 extending rearwardly from the contact portion 220, 230, and a rear portion 222, 232 extending rearwardly from the extension portion 221, 231. The fourth contact 24 includes a cylindrical contact portion 240, an annular extension portion 241 extending rearwardly from the contact portion 240, and a rear portion 242 extending from the extension portion 241. The extension portions 211, 221, 231, 241 of the first, second, third, and fourth contacts 21, 22, 23, 24 are coaxially arranged in that order from an inside to an outside of the cable connector plug 20. Accordingly, diameters of the extension portions 211, 221, 231, 241 increase in that sequence. The contact portions 210, 220, 230, 240 of the contacts 21, 22, 23, 24 are insulated from each other by a plurality of ring portions (not labeled) of the insulators 25. The extension portions 211, 221, 231, 241 of the contacts 21, 22, 23, 24 are insulated from each other by a plurality of cylindrical portions (not labeled) of the insulators 25.
The rear portion 212 of the first contact 21 extends rearwardly beyond the insulators 25 for soldering with a first wire (not shown) of a cable (not shown). A rearmost part of the rear portion 222 of the second contact 22 is exposed for soldering with a second wire (not shown) of the cable. The other part of the rear portion 222 of the second contact 22 is embedded between the corresponding insulators 25. A rearmost part of the rear portion 232 of the third contact 23 is exposed for soldering with a third wire (not shown) of the cable. The other portion of the rear portion 232 of the third contact 23 is embedded between the corresponding insulators 25. The rear portion 242 of the fourth contact 24 extends perpendicularly outward from the insulator 25 that is between the third and fourth contacts 23, 24, and is for soldering with a fourth wire (not shown) of the cable.
The cable connector plug 20 can be manufactured by way of insert molding. In a typical process, firstly, the contacts 21, 22, 23, 24 are manufactured by a machining method. Secondly, the cable connector plug 20 is integrally assembled by an insert molding method. In particular, the contacts 21, 22, 23, 24 are coaxially aligned in a mold. Molten insulating material is injected into the mold and fills spaces between the contacts 21, 22, 23, 24. The cooled insulating material forms the insulators 25 of the cable connector plug 20.
Referring to
Referring to
The contacts 21, 22, 23, 24 are made of metallic material having good electrical conductive capability, such as copper, aluminum, and so on. In order to ensure good electrical contact and attain an aesthetically pleasing surface, an anticorrosion coating can be formed on an outer surface of each of the contacts 21, 22, 23, 24. The anticorrosion coating is preferably made of nickel. The insulators 25 are preferably made of polyamide resin.
Referring to
In an alternative embodiment of the cable connector plug 20, the second anti-rotation member 245 can instead include a plurality of protrusions or one or more beads or a screw thread formed at the inner surface 243 of the extension portion 241 of the fourth contact 24. The protrusions can be contiguous elongated protrusions or discrete protrusions. The second anti-rotation member is configured to lockingly engage with the corresponding insulator 25.
In another alternative embodiment of the cable connector plug 20, the first anti-rotation member 225 can be omitted. That is, the cable connector plug 20 only has a single anti-rotation member, which is the anti-rotation member 245 at the inner surface 243 of the extension portion 241 of the fourth contact 24.
In a further alternative embodiment of the cable connector plug 20, the second anti-rotation member 245 can instead be provided at an inner surface of the cylindrical portion 240 of the fourth contact 24. This second anti-rotation member is configured to lockingly engage with the corresponding insulator 25.
It is should be noted that the above-described anti-rotation members of the cable connector plugs are not limited to the configurations provided. Each anti-rotation member can instead include any of various other suitable structures not described herein. For example, one or more non-planar structures can be formed on the inner surface of at least one of the second, the third, and the fourth contacts, whereby each of the anti-rotation members prevents or avoids the occurrence of displacement as between adjacent contacts of the cable connector plug. In other alternative embodiments, any two or all three of the insulators 25 of the cable connector plug 20 can be joined to each other at rear ends thereof, and any two or all three of the insulators 35 of the cable connector plug 30 can be joined to each other at rear ends thereof.
It is to be further understood that even though numerous characteristics and advantages of the present embodiments have been set forth in the foregoing description, together with details of the structures and functions of the embodiments, the disclosure is illustrative only, and changes may be made in detail, especially in matters of shape, size, and arrangement of parts within the principles of the invention to the full extent indicated by the broad general meaning of the terms in which the appended claims are expressed.
Number | Date | Country | Kind |
---|---|---|---|
200610201468.2 | Dec 2006 | CN | national |
This application is related to two co-pending U.S. patent applications, application serial no. [to be advised] (Docket No. US13427), entitled “CABLE CONNECTOR PLUG HAVING CONTACT WITH CURVED EXTENSION PORTION”, wherein the inventor is Wu-Kuang Chen et al, and application serial no. [to be advised] (Docket No. US13428), entitled “CABLE CONNECTOR PLUG HAVING CONTACT WITH HOOKING PORTION”, wherein the inventor is Wu-Kuang Chen et al. Such applications have the same assignee as the present application and have been concurrently filed herewith. The disclosures of the above identified applications are incorporated herein by reference.