US3388367A - Electrical connector for either flat or round conductors - Google Patents

Description

June 11, 1968 c, R W 3,388,367

ELECTRICAL CONNECTOR FOR EITHER FLAT OR ROUND CONDUCTORS Filed June 20, 1966 2 Sheets-Sheet 1 Albert C. Brown,

INVENTOR.

ATTORNEY.

June 11, 1968 A. 0 BROWN 3,388,357

ELECTRICAL CONNECTOR FOR EITHER FLAT OR ROUND CONDUCTORS Filed June 20, 1966 2 Sheets-Sheet 2 United States Patent 3,388,367 ELECTRICAL CONNECTOR FOR EITHER FLAT OR RQUND CONDUCT-6R5 Albert C. Brown, Corona, Caliii, assignor to Hughes Aircraft Company, Culver City, Calif., a corporation of Delaware Filed June 20, 1966, Ser. No. 558,878 6 Claims. (Cl. 339-32) ABSTRACT 01* THE DISCLOSURE In the disclosed electrical connector, a connector block has an elongated slot and at least one contact chamber which extends through the major cross-section of the connector block and extends across the slot. Within the chamber is a U-shaped contact element, the sides of which have one set of teeth, the bottom portion having another set. A pressure pin forces an insulated electrical conductor placed within the slot onto one of the sets of teeth such that the teeth pierce the insulation of the electrical conductor and make an electrically conductive contact.

The present invention relates to an electrical connector and more particularly to an improved connector for insulated electrical conductors adapt-able for use with both flat ribbon or cable-like conductors and the round wire conductors.

The increased utilization of electronic equipment in all areas of our contemporary society has necessitated the development of improved and simplified methods of electrically connecting or interconnecting the systems and components of such equipment. Presently, considerable emphasis has been given to the use of fiat multiconductor ribbon-like electrical conductors or tape cable conductors assembled into long ribbons and the desire to interconnect such cables to another cable or to a single conductor of the round wire type.

While a consideration of the structural features of a connector is important, and perhaps paramount in its design, consideration must also be given to the simplicity of such design, as well as the ability of a particular connector to be used in a large number of different applications and environments.

Therefore, an object of this invention is to provide an improved electrical connector for insulated conductors which is usable with electrical conductors of both the tape cable type and the round wire type.

A further object of this invention is to provide an irriproved electrical connector for insulated conductors which is simple in construction yet usable in many different applications and environments.

A still further object of this invention is to provide an improved electrical connector which is hermaphroditic in construction so that two similar connectors may be mated without the necessity of elements designated as male and female parts such as conventional connectors having pins and sockets.

In general, in its preferred form the present invention comprises a connector block containing a conductor supporting an elongated slot extending inward from a first side and terminating in a wall defining a stop for the conductor. At least one contact chamber extends across the elongated slot from said first side to a second side of the block. A contact clip is retained in the chamber and includes, on at least one end, an insulation piercing portion including a plurality of specifically oriented conductor insulation piercing teeth, a part of said teeth being adaptable to pierce the insulation surrounding a flat ribbon electrical conductor and another part of the teeth being adapt- "ice able to pierce the insulation surrounding a round individual wire electrical conductor. The other end of the clip contains an electrical contact member such as a second insulation piercing portion, or a mateable contact element which might be hermaphroditic or male and female in configuration. A pressure pin is held in a bore running from a third side of the block to each of the chambers, and once an electrical conductor is positioned in said slot engaging said teeth, the pressure pin is forced into the chamber to bring the end of it into contact with the conductor resulting in the teeth of the piercing portion piercing the insulation of the conductor and making electrical contact with the conductor.

Other advantages of the invention will hereinafter become fully apparent from the following detailed description of two preferred embodiments of the invention when considered in conjunction with th accompanying drawings throughout which like characters indicate like par-ts, and in which:

FIGURE 1 is a perspective view of an electrical contact element constructed in accordance with the principles of the present invention;

FIG. 2 is a perspective view shown in section illustrating the incorporation of the electrical contact of FIG. 1 in an electrical connector;

FIG. 3 is a side elevational view shown in section illustrating the connect-or of FIG. 2 in an application wherein a single connector is splicing a tape cable electrical conductor to a round wire electrical conductor;

FIG. 4 is a perspective view of a second embodiment of an electrical contact element constructed in accordance with the principles of the present invention; and

FIG. 5 is a side elevational view shown in section illustrating the incorporation of the electrical contact element of FIG. 4- into an electrical connector and the mating of that element with a similar element to illustrate the formation of a mated connector.

To clearly set forth the principles of this invention it will first be described in a general fashion and then specifically described in two embodiments; a first of which is a connector for interconnection or splicing of insulated flat cable and round wire conductors, the second embodiment is a connector for interconnecting two electrical circuits which has two identical, but mateable halves.

Referring first to FIG. 1, the principles of the presen invention are embodied in acontact element 10 having a U-shapedbody having sides 12 formed into a plurality of firstinsulation piercing teeth 14 and abottom portion 16 having one or more transversely folded secondinsulation piercing teeth 18. The width of thebottom portion 16 is sufficient to permit a round wire conductor to be inserted between thesides 14. The frequency and shape of theteeth 14, 18 may vary within the principles of this invention, but are sufiicient to readily pierce the insulation surrounding a flat cable and round wire, respectively. As clearly seen in FIG. 1 thecontact element 16 may be stamped out of sheet metal and formed to constitute an integral piece.

When thecontact element 10 is in the form shown in the first embodiment, FIG. 2, it is of a conductive material such as beryllium copper and includes insulation piercing portions at both ends terminating at acentral retaining portion 26 which may have a variety of shapes and shown in FIGS. 1 and 2 as generally round and having abutting edges. In this embodiment thecontact element 10 is positioned in acontact chamber 22 which extends from afirst side 24 to asecond side 26 of aconnector block 28 typically of a dielectric material such as a rigid plastic of diallyl phthalate. Thecontact chamber 22 is slightly longer than the length of thecontact element 10 and includes one wall having astep 34 defining a9 a reduced diameter portion of a diameter sufficient to tightly engage the retainingportion 20 of the contact element lit) for friction fitting said element in thechamber 22. Alongitudinal slot 32 extends inward from both thefirst side 24 and thesecond side 26 of theconnector block 28 and terminates instep 34 defined by the sides of thechamber 22. Thestep 34 functions to limit the movement of a tape or belt type electrical conductor as it is inserted into the elongated slc-t, FIG. 3.

A plurality ofbores 36 extends from athird side 38 of theblock 28 to thechamber 22 and each is aligned with one of thechambers 22 and is of a diameter to receive apressure rod 40. Thepressure rod 40 has a length sufficient to enable it to be inserted into thebore 36 and the alignedchamber 22 sufiiciently to force an electrical conductor aligned with the rod into engagement with the insulation piercing teeth of the contact element. This is clearly seen in FIG. .3 wherein the left side of the connector as seen in this figure shows apressure member 40 forcing atape cable 42 into engagement with the firstinsulation piercing teeth 14 resulting in a piercing of the insulation of the cable 42 (not shown). The length of the pressure rod 4% and the height of thefirst piercing teeth 14 are such that the squeezing of the cable between these two elements will not only pierce the insulation but will also bring theteeth 14 into electrical contact with one or more of the metallic electrical conductors encased within the tape cable 4-2.

At the right side of FIG. 3 there is shown an insulatedWire conductor 44 between the firstinsulation piercing teeth 14 forced into engagement with the second insulation piercing teeth 18 (not shown in this figure). In a like fashion as that described for thetape cable 42 contact, the length of thepressure rod 40 and the height of thewire piercing teeth 18 are such that contact is made betweencontact element 10 and the round metallic electrical conductor encased within theround conductor 44. Thus, by the use of a single connector desired electrical connection can be made between the ends of insulated taped cable conductors or the ends of insulated wire conductors without stripping the insulation, or with two cable conductors.

Referring to FIG. 4, the second embodiment of the principles of the present invention shows its application to a connector having identical halves and called in the industry a hermaphrodite connector because both halves of the connector function similar to separate male and female connector halves, such as pins and sockets.

The second embodiment contact element includes an insulation piercing portion having first and secondinsulation piercing teeth 14, 18, respectively, such as that described in relationship to the first embodiment but also includes at the other end of the element ahermaphrodite contact 50. The hermaphrodite contact includes afirst leg 52 and asecond leg 54 folded in contact and functioning as a blade or the male portion of the contact. The end of thefirst leg 52 is bent away from thesecond leg 54 for a retention finger orlouver 56 to retain the contact element in aconnector block 58 as shown in FIG. 5. The contact element also includes acontact finger 60 which is cantilevered from acentral portion 62 of the element into juxtaposition with the second leg to define alength 64 which functions as the female portion of the contact.

As shown in FIG. 5, thecontact chamber 66 of the second embodiment has a configuration which enables thecontact 50 to be retained therein. One side of thechamber 66 includes a closedentry ledge 70 and the other side of thechamber 66 includes astep 72, having afirst shoulder 74 which functions to limit the movement of the contact element in one direction by engagement with the exposed end of thecontact barrel 62 and asecond shoulder 76 which functions to engage the end of theretention louver 56 thus preventing movement of thecontact element 50 in the other direction.

To position thecontact element 50 in thechamber 66 the blade is first inserted into thechamber 66 from a first end 73 of thechamber 66 and as the blade is inserted through thechamber 66 thestep 72 depresses theresilient louver 56 which springs back into engagement With the wall of thechamber 66 after it passes thesecond shoulder 76 of thestep 72. At this point the end of the contact finger 69 has ample deflection clearance with the closed entry ledge 74). Abeveled portion 36 is formed at a second orother end 82 of thechamber 66 and this portion 8-3 functions to facilitate the engagement of a second blade with the first blade since it guides the blade into the slot between the contact finger 6t) and the folded oversecond leg 54. As described previously, the connector block 53 includes abore 36 aligned to permit a forcefit pressure rod 40 to be inserted into the chamber forcing the insulated conductor into piercing engagement with the contact element.

While the basic principles of this invention have been herein illustrated and described in two embodiments, it will be appreciated by those skilled in the art that variations in the disclosed arrangements both as to its details and as to the organization of such details may be made without departing from the spirit and scope thereof. Accordingly, it is intended that the foregoing disclosure and the showings made in the drawings will be considered only as illustrative of the principles of the invention and not construed in a limiting sense.

What is claimed is:

1. An electrical connector for electrically connecting first and second insulated electrical conductors comprising:

a connector block defining an elongated slot extending inwardly from a first side of said block and adapted to receive said first insulated electrical conductor, said block defining at least one contact chamber extending across said elongated slot from said first side to a second side and further defining at least one bore extending between a third side and said contact chamber;

a contact element disposed in said contact chamber and including at one end a first contact member defining a U-shaped body having substantially parallel side walls connected by a bottom portion with the edge of said side walls being shaped into a plurality of first insulation piercing teeth and said bottom portion having a plurality of second insulation piercing teeth, said first piercing teeth being adapted to make contact with at least one electrical conductor of an insulated fiat multiconductor tape type of cable and said second piercing teeth being adapted to make contact with an electrical conductor of an insulated round type of cable, said contact element having at its other end a second contact member adapted to electrically connect said first insulated electrical conductor to said second insulated electrical conductor; and

a pressure pin in said here adapted to be inserted therethrough such that the inserted end of said pin engages said first insulated electrical conductor to force said conductor into engagement with one of said first and second pluralities of piercing teeth, said pin exerting a force sutlicient to force the said plurality of piercing teeth to pierce the insulation of said first electrical conductor.

2. The electrical connector of claim 1 wherein said chamber includes a contact retaining portion and said contact element includes a resilient pressure portion engageable with said retaining portion to retain said contact element in said chamber.

3. The electrical connector of claim 1 wherein said first insulated electrical conductor and said second insulated electrical conductor are each selected from the group consisting of multiconductor tape cables and round wire type cables, and said elongated slot extends inwardly from both said first and said second sides, said second contact member is substantially similar to said first contact member and said connector block includes at least two bores extending between said third side and said contact chamber, each bore including a pressure pin adaptable to force a different one of said insulated electrical conductors into piercing engagement with one of said first and said second teeth.

3. The electrical connector of claim 31 wherein said plurality of first insulation piercing teeth are disposed substantially in the planes of said side Walls and wherein said plurality of second insulation piercing teeth are disposed in a plane substantially normal to said planes.

'5. The electrical connector of claim 1 wherein said second contact member is an hermaphrodite contact element having both male and female portions.

6. The electrical connector of claim '5 wherein said hermaphrodite contact element includes a blade having a tip defining a male portion and a deflectable contact 6 finger in juxtaposition to said blade, said blade and said finger defining a chamber or female portion which is adapted to contact and secure a male tip portion of a second hermaphrodite contact element.

References Iited UNITED STATES PATENTS 2,982,93'8 5/1961 Klurnpp 339-97 2,989,720 6/ 1961 Rivkin 33999 3,208,030 9/ 1965 Evans et al 339-47 3,324,447 6/ 1967 Pistey 339-95 FOREIGN PATENTS 143,328 5/1920 Great Britain.

MARVIN A. CHAMPION, Primary Examiner.

JOSEPH H. MCGLYNN, Assistant Examiner.

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