STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT
None
REFERENCE TO A MICROFICHE APPENDIX
None
BACKGROUND OF THE INVENTION
This invention relates generally to insulation displacement wire connectors and, more specifically, to wire connectors that allow one person to quickly connect two electrical wires to each other without the aid of tools and without having to cut or remove the insulation from either of the wires.
Although the wire connector may be used in many fields one of the fields that the invention is well suited for use is the tracer wire field since frequently branch wires are formed into electrical connection with a tracer wire. For example, the tracer wire field periodically requires one to form electrical branch connections to the tracer wire without cutting the tracer wire, which may follow an underground feature such as a pipeline. Examples of various types of tracer wire connectors can be found in U.S. Pat. No. 7,179,114; U.S. Pat. Nos. 8,637,774; 7,950,956; 7,093,858 and 7,179,114. Typically, to connect two wires together may require one hand to hold a set of wires in position for electrical engagement while also supporting one section of a two-part connector and with the other hand align a second section of the two-part connector with the first section of the two-part connector. Next, one engages the parts of the two-part connector to each other to form an electrical connection of the wires therein. Connections that require wire alignment before securement are typically best suited for two people since one person can hold the wires in position while the other person aligns the wires and engages the two parts of the two-part wire connector with each other.
SUMMARY OF THE INVENTION
A user-friendly wire two-stage wire connector for field use and on the go use to enable a person working alone to splice two insulation coated electrical wires to each other without having to remove the wire insulation coating from either of the wires, without the aid of tools and without having to cut the wires. The wire connector including a pair of opposed rotateable pivot arms that can be separately rotated from an open condition to a closed or locked condition as electrical wires with an insulation cover thereon are pushed between resilient tabs on an edge connector to simultaneously bring each of the electrical wires into electrical contact with the edge conductor and each other with a dual mode housing convertible from a wire connector hand grip to a protective cover over joined electrical wires.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a pictorial view of an insulation displacement wire connector in an open condition;
FIG. 2 is a pictorial view of the insulation displacement wire connector of FIG. 1 in a closed or wire connecting condition;
FIG. 2A is a pictorial view of the insulation wire connector of FIG. 1 in a closed condition;
FIG. 3 is an exploded view of the insulation displacement wire connector of FIG. 1;
FIG. 4 is a sectional view of the insulation displacement wire connector of FIG. 1 with a1 taken along lines 5-5 of FIG. 2;
FIG. 5 is a sectional view of an alternate embodiment of an insulation displacement wire connector with an alternate latching mechanism;
FIG. 6 is a bottom view of the pivotal arm of the insulation displacement wire connector of FIG. 3;
FIG. 7 is an isolated view of the edge connector of the insulation displacement wire connector of FIG. 3;
FIG. 7A is an end view of the edge connector of FIG. 7;
FIG. 8 is an isolated view partially in section of the edge connector of FIG. 7 in engagement with a wire of a first size;
FIG. 9 is an isolated view partially in section of the edge connector of FIG. 7 in engagement with a second larger wire;
FIG. 9A is an isolated view of the blunt face of the edge connector of FIG. 7;
FIG. 10 is a partial sectional view of a wire in a position to form an electrical connection therewith; and
FIG. 11 is a partial sectional view of a wire in electrical engagement with lateral side tabs of an edge connector.
DESCRIPTION OF THE PREFERRED EMBODIMENT
FIG. 1 shows a two-stage hand held and hand operable insulation displacement wire connector 10 in an open position with the wire connector 10 carrying a dual mode housing 11 that is a cover in one mode and a hand handgrip in another mode. In the handgrip mode the housing 11 forms a handle for grasping and holding the wire connector 10 during a wire connection stage and in the cover mode the housing 11 covers the electrical connections in the wire connector. The housing 11 is removable from a stored condition as a handgrip on the bottom of wire connector base 32 after completion of electrical connections between two separate electrical wires. Once removed the housing 11 is attachable to the top of the wire connector base 32 as a protective cover for the joined electrical wires in the wire connector.
A feature of wire connector 10 is that no tools are required in forming electrical connections therein making it useful for a field technician to quickly join electrical wires to each other. A further feature is that one person can quickly and easily connect two wires together.
The dual mode housing 11 when used in the cover mode may contain a sealant 70 (FIG. 5) and can used to encapsulate and protect electrical junctions within the wire connector 10 after the formation of the electrical junctions in the wire connector. In the first stage one forms an electrical connection of insulation covered wire 19 to an internal conductor comprising a wire-engaging member 18 (FIG. 7) without cutting the wire 19 and without removing the insulation on the insulation covered wire 19. In the second stage one forms a second electrical connection to the same internal conductor 18 but at a different location on the internal conductor 18 also without removing the insulation covering on the wire 20, which allows a work person in the field and on-the-go to conveniently splice wire 20 to wire 19 since all the wire connector components, which are shown in FIG. 1, are held together as a unit during the two stage connection phase. Once the internal electrical connections are formed one can remove the dual mode housing 11, which is in the handgrip mode, from base 32 and encapsulate the electrical connector as shown in FIG. 2A as well as encapsulate the electrical junctions formed therein using only the parts in hand. In some cases a sealant 70 (FIG. 5) may be located in housing 11 thus enabling the waterproofing of the electrical connections by forcing the sealant around the wire connector as the dual mode housing 11 in the cover mode is attached to the top of the base 32.
The insulation displacement wire connector 10 includes an elongated base 32 with an elongated protective dual mode housing 11 temporarily and removeably stored on the underside of base 32 through a set of latches. Housing 11 is hand removable from the underside of base 32 and hand attachable to a top side of base 32 for on-the-go formation of an enclosure or cover to protect electrical connections formed to wire 19 and wire 20. That is, housing 11 includes latch hooks 11j, 11k, 11L and 11m for attachment to a first or underside of the base 32 when electrical connections are formed with the wire engaging member 18 with the housing 11 removable from the first side of the base 32 and attachable to an opposite side of the base 32 for encapsulation of the wire-engaging member 18 after an electrical connection has been formed therein with the housing side flaps 11f, 11g, 11h, 11e, 11a, 11b, 11c and 11d flexing to permit the first wire 19 and the second wire 20 to enter there between as the housing 11 is attached to the top side of the base 31 as shown in FIG. 2A.
In the example shown in FIG. 1 a first tee shaped wire pusher or pivot arm 17 is pivotally mounted on one end of base 32 and a second tee shaped wire pusher or pivot arm 13 is pivotally mounted on the other end of base 32 with operation of each pivot arm independent of the other. A first upright sidewall 12f, which is supported by base 32, is located on one side of arm 13 and arm 17 and a second upright sidewall 12g, which is also supported by base 32, is located on the opposite side of arm 13 and arm 17 with the side walls 12f and 12g supporting and shielding the wire pushers or pivot arms 17 and 13 when in a closed condition.
A first pivot pin 42 forms a first fulcrum that extends between the upright sidewall 12g and upright sidewall 12f and through an opening 13m (FIG. 3) in the end of pivot arm 13 to rotationally support pivot arm 13 thereon. A second pivot pin 43 forms a second fulcrum that extends between the upright sidewalls 12g and 12f and through an opening 17m (FIG. 3) in the end of pivot arm 13 to rotationally support pivot arm 17 thereon. Thus, a set of electrically insulating upright sidewalls 12f and 12g, which are spaced from each other, support a pair of spaced apart pivot arm fulcrums for pivotally and independently supporting pivot arms 13 and 17 as well as shielding connections and components between the sidewalls 12f and 12g. Examples of electrically insulating materials suitable for use in connector 10 are acrylonitrile butadiene styrene and polypropylene although other materials may be used without departing from the spirit and scope of the invention.
Wire connector 10 includes a first U-shaped top open wire cradle 12a on upright side 12f and a second U-shaped top open wire cradle 12b in upright side 12g that cradle and supports wire 19 which extends through the sides of the wire connector. On the opposite side of connector 10 a U-shaped top open wire cradle 12c cradles and supports wire 20 while upright sidewall 12g provides an end stop for the end of wire 20. Thus, during the field formation of an electrical connection between wires 19 and 20 the wire cradles 12a, 12b and 12c hold the wires in a position to facilitate electrical connection of the wires 19 and 20 to each other through an internal edge conductor 18, which is shown in isolated view in FIG. 7.
In the example shown in FIG. 1 the end of wire 20 is about to be connected or spliced to wire 19, which is uncut and extends through the sidewalls 12g and 12f of wire connector 10, however, it is envisioned that in some cases one may wish to connect two side by side wires to each other, both of which are uncut. In such a wire connector a further wire cradle may be formed in upright side 12g. Each of the wire cradles 12c, 12a and 12b provide support for a wire placed therein to limit downward penetration of the wires into the wire connector 10 as well as limit lateral motion of a wire therein prior to the wire brought into an electrical connection with internal edge conductor 18.
FIG. 2 shows the two-stage insulation displacement connector 10 in a closed condition after formation of an electrical connection between electrical wire 19, which is supported in wire cradle 12a that is located in upright sidewall 12f, and a wire cradle 12b, which is located in upright side 12g (FIG. 1). An electrical wire 20, which is supported in wire cradle 12c is located in upright side 12f. The wire cradles allow one to quickly and properly position the wires 19 and 20 for forming an electrical connection as well as to hold the wires during and after the formation of an electrical connection between the two wires. A feature of the insulation displacement wire connector 10 is that wire 20 can be electrically connected to wire 19 without having to cut wire 19 or remove the insulation from either wire 19 or wire 20 through edge connector 18 (FIG. 3) that is located between upright side 12f and upright side 12g.
Housing 11, which is temporarily stored on the underside of base 32, includes a set of wire entry side flaps that permit the housing 11 to be placed around wires that are joined in base 32. That is, one side of housing includes wire entry side flaps 11a, 11b, 11c and 11d, which are each joined to housing 11 by an integral living hinge. Similarly, side flaps 11e, 11f, 11h and 11g are each joined to base 11 through an integral living hinge. A third set of identical side flaps are located on the opposite side of housing 11 to accommodate wire 19. The side flaps permit the housing 11 to extend around the wires as the housing/is placed on the topside of base 32 as a cover since the flaps flex on their living hinges to accommodate the wires 19 and 20, which are supported in connector 10 by base 32.
The housing 11 includes latch hooks 11j, 11k, 11L, 11m (FIG. 3) for attachment to a first side of the base 32 when electrical connections are formed with the wire engaging member with the housing 11 removable from the first side of the base and attachable to an opposite side of the base 32 for encapsulation of the wire-engaging member 18 after an electrical connection has been formed therein with the housing 11 including flexible side flaps that flex around the first wire and the second wire as the housing 11 is attached to a second side of the base to form a cover around the electrical wires extending through the housing 11.
FIG. 3 shows an exploded view of the components of the insulation displacement connector 10 revealing a wire-engaging member 18 comprising an electrically conductive edge connector 18, which can be supported between upright sidewall 12f and upright sidewall 12g by pins 40 and 41. In this example the entire wire connector 10, with the exception of the edge connector 18, can be assembled from non-conductive electrical components through a set of pins 40 and 41 that extend through the electrically conductive edge connector 18.
FIG. 4 is a cross sectional view taken along lines 5-5 of FIG. 2 revealing pivot arm 17 in a closed condition and having a first side lip 17d that rests on top of upright side 12f and a second side lip 17c that rests on top of upright side 12g. That is, upright side 12f and upright side 12g form a stop to limit rotating of pivot arm 17 and hence the penetration of the wire into the wire engaging member thus avoiding damaging the wire by limiting how far a wire can be forced into the wire engaging member 18. FIG. 4 also shows an end view of a slot 17e and FIG. 6 shows a bottom view of pivot arm 17 revealing the slot 17e of width W with slot 17e formed by web 17h and web 17g that extend partially along the underside of pivot arm 17. In this example a latch 17m on one side of pivot arm 17 and a latch 17f on the opposite side of pivot arm 17 provide for locking engagement of the pivot arm 17 with the upright sides 12f and 12g to thereby hold the pivot arm 17 in a locked or closed condition once the electrical connection has been formed between the wire edge connector 18 and the wires 19 and 20. This ensures that the electrical connection can be maintained. As can be seen in FIG. 4 the slotted pivot arm 17 sandwiches the flexible electrical conductor 18 therein as the slotted pivot arm 17 pushes the electrical wires into electrical contact with the electrical connector 18 to limit lateral displacement of the wire connector 18. Although not shown the pivoting of slotted pivot arm 13 also sandwiches the electrical connector 18 therein as the slotted pivot arm 13 also pushes the electrical wires into electrical contact with the electrical connector 18.
FIG. 6 and FIG. 7A show the width W of slot 17e as wider than the width W1 of the edge connector 18 so that the edge connector 18 can be quickly aligned with the slot therein. The width W of slot in relation to the width W1 of the edge conductor (FIG. 7A) is such that the slot sidewalls 17k and 17j allow free passage of edge connector 18 therein but inhibit the edge conductor 18 from bending as the sidewalls engage the wires being forced into tabs extending upward from the edge connector 18. In addition the pivot arm 17 facilitates alignment of the edge connector 18 with the slot 17e since the pivot arm rotates in a plane that extends through the edge connector 18. The pivot arm 13, which is located on the opposite end of housing 32, is identical and is not described herein. In the example shown two pivot arms are described, however, if desired a single pivot arm that can pushingly engage both of the electrical wires may be used to form an electrical connection of the wire engaging member 18 to the electrical wires located in the wire engaging member, however, two pivot arms are preferred since it is generally easier to make one connection at a time than two at once.
FIG. 4 reveals the engagement of a side hook or a side latch 17f on pivot arm 17 with a channel wall 23 in upright side 12f and the engagement of a side hook or side latch 17m on pivot arm 17 with a channel wall 23a on upright side 12g. In this example the resiliency of the electrical insulation material of pivot arm 17 and upright sides 12f and 12g allow a tapered face on each of the latches 17f and 17m to be forced between upright sides 12f and 12g until the latches are in locking engagement with the channel wall 23 and channel wall 23a, which retards or prevents withdrawal as an underside of hook 17f and an underside of hook 17g engage the respective channel wall 23a and 23. Consequently, once the electrical connection of the wire to connector 18 is formed one is assured that the wire will remain in contact with the wire connector 18.
As can be seen in FIG. 4 the edge connector slot 17e has a width wider that is wider than the width of the edge connector 18 to enable the edge connector 18 to easily fit into slot 17e. The purpose of pivot arm 17 is to smoothly and evenly force wire 20 down into the wire engaging edges 28a and 29a (FIG. 7) of edge connector 18 as the slot 17e extends on both sides of edge connector 19 to confine laterally movement of the edge connector.
FIG. 10 is a partial view that shows that the continued pivoting of pivot arm 17 forces the insulation covered wire 20 into the gap 18d in edge connector 18 as blunt edges 28a and 29a of the edge connector 18 are brought into sliding and insulation piercing engagement with the insulation covered wire 20 while FIG. 11 shows that the continuing pivoting of arm 17 forces wire 20 between tabs 28 and 29 in a continued sliding and insulation piercing engagement to locally remove the flexible wire insulation cover 20b while simultaneously forming electrical contact between the tabs 28 and 29 of edge connector 18 and the wire 20. Once the pivot arm 17 is engaged the latch 17f and latch 17g (FIG. 4) the wire 20 is held in position to prevent accidental rotation or release of pivot arm 17 thereby ensuring that the wire 20 held in edge connector 18 remains in position to maintain the wire 20 in electrical contact with the edge connector 18. Although not shown the pivot arm 13 operates in an identical manner as wire 19 is formed into electrical contact with edge of tab 30 and edge of tab 31, which are on the opposite end of the edge connector 18.
Thus, the invention provides a method of independently forming an electrical connection between two wires 19 and 20 without removing the electrical insulation from either and without having to cut the two wires by forcing a first electrical conducting wire 19 between a first set of tabs 30, 31 (FIG. 7) on an edge connector 18 wherein the first set of tabs form an interference fit with the first electrical conducting wire 19 to establish an electrical connection to the edge connector 18 and forcing a second electrical conducting wire 20 between a second set of tabs 28, 29 (FIG. 7) on the edge connector 18 wherein the second set of tabs form an interference fit with the second electrical conducting wire 20 to establish an electrical connection between the first electrical wire 19 and the second electrical conducting wire 20 through the edge connector 18.
FIG. 7 shows an isolated front view of a one-piece edge connector 18 for establishing electrical contact with covered electrical wires through penetration of the layer of insulation on the exterior of an electrical wire while FIG. 7A shows an isolated end view of edge connector 18. Typically, edge connector 18 may be made from a thin strip of copper alloy, which in addition to having good electrically conductivity also provides both stiffness and resiliency to support cantilevered tabs formed in the edge connector 18. However, other materials may be used without departing from the spirit and scope of the invention.
In the example shown the edge connector 18 includes a first cantilevered wire-engaging member 27 having a first cantilevered tab 31 and a second cantilevered tab 30 with a wire-receiving slot 18c of width W2 formed by a first edge 31a and a second edge 30a, which are spaced from each other in a face to face relationship, with each of the tabs having a rounded end surface that converges to a wire receiving slot 18c between the tabs. Edge connector 18 also includes a second cantilevered wire-engaging member 26 having a first cantilevered tab 29 and a second cantilevered tab 28 with a wire-receiving slot 18d of width W2 formed by a first edge 29a and a second edge 28a, which are spaced from each other in a face to face relationship, with each of the tabs 29, 28 having a rounded end surface that converges to a wire receiving slot 18d between the tabs.
A set of holes 18a and 18b permit the edge connector 18 to be mounted in base 32 by clamping the edge connector between upright member 12f and 12g through fasteners 40 and 41. (FIG. 1)
FIG. 9A shows an isolated partial top view of tab 31 of a portion of the edge connector 18 revealing a blunt edge 31a and an angled corner 31b and an angled corner 31c. In operation the blunt edge 31a can remove insulation and form an electrical face-to-face connection to a wire as it is forced between the tabs. The blunt edge has the benefit of lessening the chances of cutting the wire that may occur if the edge has a v shaped blade, however, in some applications where harm to the wire would be minimal one may use a v-shaped blade. The other edges are identical and are not described herein.
A feature of the invention is that the wire connector 10 can receive and form electrical connections to a range of different size wires. For example, wire gauges 12AWG and 14AWG may be formed into electrical engagement with slot widths W2 of the same size. In the event the wire is oversized the flexibility of edge connector 18 accommodates the oversized wire through a deflection of the tabs as shown in FIG. 9, which causes the rigid angled corners of blunt edge 31a to bite into the electrical wire core 25a. Thus, with edge connector 18 either the face 31a or the angled corners 31c or 31b or both of the cantilevered tab 31 engage one side of the wire and the corresponding face and angled corners of tab 30 similarly can engage the opposite side to form an electrical connection. The wire connector 10 being able to connect electrical wires of different diameters without changing the spacing between tabs since the flexing of the tabs of the edge connector 18 are used to form electrical connections when the wires are of different sizes.
FIG. 10 shows that in operation of connector 10 a wire 20 is first placed between the rounded top of tabs 29 and 28. Next, one pivots pivot arm 17 to force the wire downward into the slot 18d between the tabs 29 and 28 where the edges 29a and 28a pierce the insulation to make contact with the electrical wire 20a therein. Similarly, a second wire 19 is first placed between the top of tabs 31 and 30 and one pivots pivot arm 13 to force the wire 19 downward into the slot 18c between the tabs 30 and 31 where the rigid blunt wire engaging edge 30a and the rigid blunt wire engaging edge 31a pierce the insulation to make contact with the electrical wire therein. Thus, a first pivot arm 17 forces a first wire 20 into electrical contact with the blunt edges 28a and 29a of the first set of tabs 28 and 29 and similarly a second pivot arm 13 forces a second wire 19 into electrical contact with the blunt edges of the second set of rigid wire engaging edges 30a and 31a on tabs 30 and 31 whereby the electrical contact of the first wire with the first set of tabs and the electrical contact of the second wire with the second set of tabs forms an electrical path between the first wire and the second wire through the edge connector 18.
The width W2 between tabs 30 and 31 as well as the width W2 between tabs 28 and 29 is an interference fit with the electrically conducting core of each of the wires inserted therein. The interference fit of tabs 30 and 31 causes the rigid edges 30a and 31a to penetrate through the insulation covering on the wire therebetween as the wire connector edges 30a and 31 are brought into electrical contact with the electrically conducting wire core of the wire. Similarly, the interference fit of tabs 29 and 28 with a wire core therebetween causes the wire connector edges 30a and 31a to penetrate through the insulation covering 20b on the wire 20 as the rigid edges 29a and 28a are brought into electrical contact with the electrically conducting wire core of the wire.
To appreciate edge 30a and edge 31 engagement with an electrically conductive wire core reference should be made to FIG. 8, which shows wire 20 having an electrically conducting core 20a and a soft flexible outer insulation cover 20b. In the example shown wire 20 has been forced between tabs 31 and 30 causing the wire edges 30a and 31a to penetrate the insulation covering 20b to make electrical contact with the electrical conductive wire core 20a. Similarly, wire 19 can be formed into electrical contact with tabs 28 and 29 through engagement of edges 28a and 29a, which engage the electrical wire core therein.
FIG. 10 and FIG. 11 are isolated views showing the formation of an electrical connection with wire 20, which has an eclectically conducting core 20a and a soft, flexible, annular, outer insulation covering 20b. FIG. 10 shows the wire 20 supported on the rounded ends of tabs 28 and 29 since the diameter of the wire 20 is greater than the slot width W2. The pivot arm 17 with slot 17e is shown partially in section and in position to push or force the wire 20 between the tabs 28 and 29. In this example the rounded ends act as a funnel or guide to direct the wire 20 into the slot 18d between tabs 28 and 29 as the pivot arm 17 is rotated. As the wire 20 is forced between the tabs 28 and 29 the blunt edges 28a and 29a penetrate the soft, flexible, outer insulation cover 20b until the blunt edges 28a and 29a engage the wire connector 20a because of an interference fit between the gap W2 of the tabs 28 and 29 and the diameter of core 20a. The interference fit causes the tabs to yield slightly along a plane extending through the tabs as the wire is forced between the tabs. The spreading of the tabs along a plane through the tabs creates a compressive force on the wire to maintain the edges of the tabs in electrical contact with the wire 20. However, if the interference is to great tabs may be spread beyond a yield point and thus may not maintain itself in electrical contact with the wire. A feature of the invention is that a portion of a spreading force can be used to laterally deflect the tabs without exceeding the yield point of the material and thus allow more than one size wire to be connected in the wire connector. Thus a feature of the invention is the wire-engaging member 18 comprises a rigid but laterally resilient member that enables on-the-go connection to a pair of electrical wires as illustrated in FIGS. 8-11.
FIG. 11 shows the pivot arm 17 after the pivot arm has been rotated sufficiently to force wire 20 into the slot 18d between tabs 28 and 29. In this condition the edges 28a and 29a have pierced the insulation covering 20 and are in contact or electrical engagement with the electrical conducting core 20a. In addition the end of tab 28 and the end of tab 29 are located within slot 17e and are laterally confined by the sidewall 17j and sidewall 17k to prevent the tabs 28 or 29 from folding over if the diameter of the wire is sufficiently larger than the width W2 between the wires. Similarly, pivot arm 13 includes identical sidewalls to prevent the tabs 30 or 31 from folding over if the diameter of the wire is sufficiently larger than the width W2 between the wires,
A feature of the wire connector 10 is that the edge connector 18 can form electrical connections with wires of different sizes through a flexing action of the tabs of the edge connector 18. To illustrate this feature FIG. 8 shows a sectional view at the points of contact of a wire 20 with the tabs 30 and 31 and FIG. 9 shows a sectional view of the points of contact of a larger wire 25 with the tabs 30 and 31. FIG. 9 shows wire 25 having an electrical conductive core 25a and a soft flexible outer insulation cover 25b with the wire edge 31a in engagement with one side of wire 25 and wire edge 30a in engagement with the opposite side of wire 25. The distance between the tabs in the unengaged condition is W2 as shown in FIG. 7, however, in the engaged condition shown in FIG. 9 the wire edges 31a and 30a have been forced apart axially and laterally to accommodate the larger diameter D2 of wire 25 through a lateral flexing of the tabs 30 and 31, which is revealed by the distance T1 that indicates the flexing of the tabs at the points of contact of the tabs in response to the wire 25 being forced therebetween. In contrast, as shown in FIG. 8 the smaller wire 20 which is in engagement with the tabs 30 and 31 produces less flexing of the tabs as indicate by the dimension T2, which is less than the dimension T1. However, in both cases an electrical connection to the tabs 30 and 31 has been formed. With the larger wire 25 the confinement of the side walls of 17k and 17j of the pivot arm with the cantilever ends of tabs 29 and 30 can maintain the tabs 29 and 30 in position to penetrate the insulation and make electrical contact with the wire core 25a even though the tabs may flex at the point of contact with the electrical wire. Thus, a feature of the invention is that the wire connector 10 can accommodate a range of wire sizes through the resiliency of flexible tabs 29 and 30, which can redirect a portion of a tab spreading force to laterally deflect the tabs in response to the larger diameter wire in engagement with the wire core. For example, with copper alloy tabs having a thickness W1 of 0.032 inches and a width W2 one can connect a wire 20 such as shown in FIG. 8 that forms an interference fit 0.008 inches between the wire and the edges of the edge connector or one can connect a wire 25 that forms an interference fit of 0.025 inches between the wire and the edges of the edge connector. In either case one can obtain a good electrical connection. The example provided herein is to illustrate the ability of the tabs of the same width to electrically engage wires of different size although no limitation to dimensions or materials is intended. The feature of the laterally deflection of the tabs as well as the spreading of the tabs allows the spreadable tabs to form an interference fit with different size wires while at the same time the material of the tabs is not stressed beyond the yield point of the material.
Once the wire edge connector 18 engages the wire the pivot arm 17 is latched to maintain the pivot arm and hence the wire in position against the edge connector. A reference to FIG. 4 shows a latch comprising hooks 17f and 17m while a reference to FIG. 5 shows a latch on arm 17 formed by a dimple 35 in upright 12a and protrusion 36 on one side of lever 17 and a dimple 38 in upright 12g and a protrusion 37 on one side of lever arm 17. In the latched position as shown in FIG. 5 the lever arm is maintained in position thereby ensuring that the wire located in the edge connector 18 is maintained in the edge connector 18. In this example the ledge 17c of pivot arm 17 engages the top of upright 12g and ledge 17d engage the top of upright 12a as the dimples and protrusions secure the pivot arm in position while in the example of FIG. 4 the hook 17f engages the channel wall 23 and the hook 17m engages the channel wall 23a to hold the pivot arm in position.
FIG. 5 shows the hand attachable housing 11 in section with end fasteners for latching the housing 11 to either the top or the bottom of base 32. Housing 11 includes a cantilevered latch hook 11j having a tapered face on one side and a cantilevered latch hook 11m having a tapered face on the opposite side with hook 11j extending through opening 34b to engage base 32 and hook 11m extending through hook 34a to engage base 32 to removable store the housing 11 as a handgrip on the underside of base 32 as wires are being connected to each other through the wire engaging member 10. By squeezing the sides of housing 11 the fastener comprising latch hook 11j and the fastener comprising latch hook 11L can be forced inward toward each other from housing 11 allowing one to remove housing 11 from the underside of base 32. Once removed the housing 11 which can function either as a cover or handgrip can be reversed and placed on the top of wire connector 10 with the latches 11j and 11m of the housing 11 engaging the base 32 from the top side to thereby form a protective cover over the wire connector 10. That is, by engaging latch hook 11j and latch hooks 11m from the topside of base 32 rather than the underside of the base one can form a protective cover over the electrical connections therein.
FIG. 3 illustrates that the ends of housing 11 may include latch 11L and 11k that fastened in an identical manner to latch 11j and latch 11m. Thus, the fasteners or latches comprising hooks 11k and 11L on the end of housing 11 (FIG. 3) can similarly be engaged with openings 32d and 32c in base 32 from either the top side of base 32 or the bottom side of base 32.
Patent Grant
9472869
