Abstract:
An electrical connection device provides an on-line extension of a multi-conductor electrical cable assembly permitting electrical entry of the cable circuits while they are operational, facilitates interconnection of plural multi-conductor electrical cable assemblies, enables hands-off probing of respective circuits of such assemblies, allows facile field modification of electrical equipment utilizing such assemblies, and the like.

Description:
This is a continuation, of application Ser. No. 653,476, filed Jan. 29, 1976, now abandoned. 
    
    
     BACKGROUND OF THE INVENTION 
     The present invention relates, in general, to an electrical connection device and, in particular, to such a connection device that effects simultaneous connection of respective circuits of a multi-conductor electrical cable assembly with a like assembly of the same or opposite sex type, of such an assembly with a multiple contact terminal, and the like. 
     Multi-conductor electrical cables are used to connect plural electrical signals between two locations, such as, for example, between two sub-assemblies of a computer or the like. Such multi-conductor electrical cables include more than two individual conductors therein and often may include on the order of from about twenty to about fifty or even more individual conductors for conducting a corresponding number of electrical signals. One type of multi-conductor electrical cable commonly used in the computer industry is a flat or ribbon-like cable. To facilitate simultaneous connection of the multiple conductors in such a cable to those of another cable, to a multiple contact terminal of a computer, or other such device, various types of available terminations are used. These terminations include a plurality of electrical contacts, such as fork contacts, pin contacts, respectively being of the female or male type, or other contacts, of a number corresponding to the number of conductors in the cable. The combination of such a multi-conductor electrical cable and a termination therefor constitutes a multi-conductor cable assembly, sometimes referred to below as a cable assembly, cable termination assembly and the like. 
     SUMMARY OF THE INVENTION 
     In the present invention an on-line electrical connection device provides an extension for such multi-conductor cable assemblies to interconnect two or more such assemblies in electrical series or electrical parallel relation, to connect one or more such assemblies with a multiple contact terminal, for example, of a computer, to facilitate connecting the circuits of such assemblies to external devices for testing or exercising purposes, to facilitate field modification of circuits employing such assemblies, and so on. 
     The on-line feature of the present invention means that it is connectible physically as an extension of a multi-conductor cable assembly between the latter and, for example, another assembly or other terminal, as opposed to being a remotely located connector or piece of electrical equipment, and this feature facilitates making of the described connections without having to proceed through a relatively remotely located device, thereby reducing circuit materials and enhancing the integrity of the made electrical connections. In the following description reference to circuits, circuit portions, conductor circuits, etc., means an electrically conductive path, whether a wire conductor, a contact conductor or the like, forming either part of a complete electrical circuit or potentially useful as part of an electrical circuit. 
     Accordingly, the electrical connection device of the invention permits electrically entering each of the conductor circuits of a multi-conductor cable assembly while the latter is connected for and in operational use. Such electrical entry enables immediate testing, measuring, exercising, modifying, etc., of those circuits without interrupting operation. Reference here to exercising means the input of supplemental signals from an external supply via the connection device to determine the responsive reaction of the circuits being exercised. Moreover, while the connection device is so operationally connected on-line with one or more cable assemblies respective accessible contacting parts are provided for the mechanical attachment of a test probe tip or the like for testing or other purposes of each circuit in a hands-off manner, whereby the technician&#39;s hands are free for operating the test equipment, whereby the test equipment can continuously monitor the circuits, etc. Further, two or more such cable assemblies with terminations of the same sex type may be interconnected, which may reduce the usual cable assembly inventory normally stocked by manufacturers, distributors, etc. Additionally, two or more of the connection devices may be connected together as a modular parallel bus system, for example, to join signals from several circuit boards or the like. 
     With the foregoing in mind, it is a primary object of the invention to provide a usable, readily accessible on-line terminal for each of the conductor circuits of a multi-conductor cable assembly. 
     Another object is to extend the respective contacts of a multi-conductor cable termination to provide an additional contact part for each respective contact of such termination. 
     An additional object is to provide for hands-off probing of plural circuits running through a multi-conductor electrical connector, cable assembly and the like. 
     A further object is to connect plural multi-conductor cable terminations of the same sex type. 
     Still another object is to connect two multi-conductor cable assemblies in electrical parallel. 
     Still an additional object is to facilitate on-line testing and/or exercising of plural circuits including the respective conductors of a multi-conductor cable assembly. 
     Still a further object is to provide on-line input electrical signals to the respective conductors of a multi-conductor cable assembly. 
     Yet another object is to divide each of the conductor circuits of a multi-conductor cable assembly to respective plural circuits. 
     Yet an additional object is to provide each of the foregoing features for a multi-conductor cable assembly having on the order of from about 20 to about 50 individual conductors. 
     These and other objects and advantages of the present invention will become more apparent as the following description proceeds. 
     To the accomplishment of the foregoing and related end, the invention, then, comprises the features hereinafter fully described in the specification and particularly pointed out in the claims, the following description and the annexed drawing setting forth in detail a certain illustrative embodiment of the invention, this being indicative, however, of but one of the various ways in which the principles of the invention may be employed. 
    
    
     BRIEF DESCRIPTION OF THE DRAWING 
     In the annexed drawing: 
     FIG. 1 is an isometric view of the connection device of the invention; 
     FIG. 2 is a partial top plan view, partially broken away in section, of the connection device of FIG. 1, having part of the housing cover removed; 
     FIG. 3 is a section view of the connection device with the housing cover in place and looking generally in the direction of the arrows 3--3 of FIG. 2; and 
     FIG. 4 is an isometric view of a typical electrical contact utilized in the connection device. 
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENT 
     Turning now more particularly to the drawing, wherein like reference numerals designate like parts in the several figures, the electrical connection device in accordance with the invention is generally indicated at 1 in FIG. 1. The fundamental parts of the electrical connection device 1 comprise a plurality of electrical contacts 2, for example, of suitable electrically conductive material held in relatively fixed positions by a dielectric, i.e., electrically non-conductive, housing 3, for example, of plastic-like material. The connection device 1 may have, for example, first, second and third connecting portions 4, 5, 6 at the front, back and top thereof, respectively, formed by respective contacting parts of the electrical contacts 2 in respective conventional dual-in-line patterns ready for connection with appropriate contacts of a dual-in-line configured multi-conductor cable termination, multiple contact terminal and the like. 
     Reference to contacting parts herein means those portions of the electrical contacts 2 adapted for electrical and at least abutting mechanical connection with part of another electrical contact; for example, in the illustrated embodiment of the invention a first contacting part 11 of each electrical contact 2 is a female type fork contact and second and third parts 12, 13 are male type pin contacts, as is shown more clearly in FIGS. 2, 3 and 4. The first connecting portion 4, therefore, is comprised of all the first contacting parts 11 and is intended for connection with a corresponding pattern of pin contacts of a male termination or the like, and the second and third connecting portions comprise, respectively, the second and third contacting parts 12, 13 for connection, for example, with female terminations or the like, for test probing, etc. Moreover, each of the contacting parts 11, 12, 13 has a readily accessible portion for making such connections and the pin contacts 12, 13 additionally may be grasped by the jaws of a test probe or conveniently touched to abutment thereby for hands-off testing purposes, as described. 
     Referring now more particularly to FIGS. 2, 3, and 4, each electrical contact 2 comprises a base 14 from which the first, second and third contacting parts 11, 12, 13 are commonly supported, and preferably the first and second contacting parts of each electrical contact are substantially co-planar with the base 14 and extend therefrom generally in parallel, but opposite, directions, respectively, toward the front and rear of the electrical connection device. On the other hand, the third contacting part 13 of each electrical contact extends in an upward direction generally perpendicular to the directional extents of the first and second contacting parts 11, 12. 
     As is illustrated most clearly in FIG. 3, the electrical contacts 2 are positioned in two spaced apart parallel rows, the upper row being represented by the electrical contact 2a, and the lower row being represented by the electrical contact 2b, these having respective parts designated by a corresponding suffix. By so positioning the electrical contacts 2a and 2b in such parallel rows, the dual-in-line positioning of the first contacting parts 11a, 11b in the first connecting portion 4 and the second contacting parts 12a, 12b in the second connecting portion 5, the dual-in-line patterns of those connecting portions are readily achieved. Moreover, to obtain the dual-in-line pattern of the third contacting parts 13a, 13b in the third connecting portion 6, each of the third contacting parts 13b of the electrical contacts 2b is off-set from its base 14b by an extension 15b, which is defined between the base and the location of the upward extent or bend of the third contacting part 13b; whereas the third contacting parts 13a of the electrical contacts 2a commence their vertical extent relatively more proximate their respective bases 14a. 
     The electrical contacts 2 may be stamped from flat metal stock or sheet material, and after being stamped the leg of the third contacting part may be bent perpendicularly to the otherwise generally flat planar extent of the electrical contact. When the leg is bent close to the base, the third contacting part 13a is formed; and when the leg is bent more remotely from the base, the off-setting extension 15b and third contacting part 13b are formed. 
     The dielectric housing 3 is formed of upper and lower body parts 16a, 16b preferably molded, respectively, about at least part of the electrical contacts 2a, 2b. Openings 17 in the upper body part 16a provide passage therethrough for the third contacting parts 13b for their alignment with the respective third contacting parts 13a in the dual-in-line pattern of the third connecting portion 6. The upper body part 16a has a bottom peripheral flange 18a for abutment and securing with a top peripheral flange 18b on the lower body part 16b, for example, by ultrasonic welding or other fastening technique, with the third contacting parts 13b positioned through the respective openings 17. A hollow 19 is defined between the thusly secured body parts facilitating their assembly. 
     A housing cover 20 may be included as another part of the dielectric housing 3 for guiding pin contacts, for example, through respective openings 21 in the cover to engagement with respective pairs of fork-like arms 22 of the fork contacts comprising the first contacting parts of the electrical contacts 2. The housing cover 20 also has interior walls 23, 24 for further guidance of inserted pins and for electrical isolation of respective fork contacts, and the housing cover may be secured to the housing body parts 16a, 16b at a step juncture 25, for example, by ultrasonic welding or other fastening technique. 
     In one exemplary use of the electrical connection device 1, it may be connected on-line as an extension of a multi-conductor cable assembly between the latter and a terminal input of an electrical apparatus, such as a computer, utilizing the first and second connecting portions 4, 5. The third contacting parts 13 are then readily accessible for electrically entering each of the circuits connected through the device 1, for example, by one or more individual test probes that may be touched or secured to respective third contacting parts 13 to examine or to test signals in the respective circuits. Alternatively, another multi-conductor cable assembly may be attached to the third connecting portion 6 to connect the same to remotely located electrical equipment for comprehensive electrical testing and/or exercising of the respective circuits. As another alternative the device 1 may join two multi-conductor cable assemblies in parallel with each other by connection to two of the connecting portions thereof and in series with such electrical apparatus by connection of the remaining connecting portion to such apparatus. Similarly, by connecting together two electrical connection devices 1 as a modular parallel bus system, three cable assemblies may be connected in parallel with each other and in series with such electrical apparatus, and so on. The device 1 allows connection of two cable assemblies of the same sex type, e.g., two terminations both employing fork contacts, and facilitates field modification of electrical equipment employing such cable assemblies, for example, by the addition of circuits, short circuiting of existing circuits, etc. These are but a few of the various uses of electrical connection device 1. 
     It will, of course, be appreciated that the respective contacting parts of the electrical connection device 1 may be all male type, all female type, all another type, or any combination thereof in accordance with the invention. Also, while the preferred form of the device 1 provides the contacting parts in dual-in-line patterns, they may be in a single-line pattern or in a three or more in-line pattern in accordance with the invention. Further, it will be appreciated that each electrical contact of the device 1 may be formed of four respective contacting parts, for example, by pins bent vertically downward relative to the illustration of FIG. 3 with those of the contacts 2a being off-set from their bases. Moreover, the directional extents, vis-a-vis the coplanar and perpendicular directions, of the contacting parts may be modified while still being within the spirit and scope of the invention. 
     It should now be clear that the present invention provides for the extension of a multi-conductor cable assembly having several or many conductor circuits therein, thereby to increase the versatility of such cable asembly and the circuits in which the conductors thereof are connected.