|Publication number||US3920305 A|
|Publication date||Nov 18, 1975|
|Filing date||Jan 21, 1974|
|Priority date||Jan 21, 1974|
|Also published as||CA1028402A, CA1028402A1|
|Publication number||US 3920305 A, US 3920305A, US-A-3920305, US3920305 A, US3920305A|
|Inventors||Scott William J|
|Original Assignee||Ideal Ind|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (3), Referenced by (11), Classifications (6)|
|External Links: USPTO, USPTO Assignment, Espacenet|
O Umted States Patent [191 [111 3,920,305
Scott [451 Nov. 18, 1975 NO-STRIP TAP CONNECTOR 3,793,612 2/1974 Driscoll 339/98  Inventor. William J. Scott, Sycamore, Ill. Primary Emminer joseph H Mcclynn  Assignee: Ideal Industries, Inc., Sycamore, Ill. Assistant ExaminerMark S. Hicks  Filed. Jan 21 1974 Attorney, Agent, or FirmKinzer, Plyer, Dorn &
McEachran  Appl. No.: 435,108
 ABSTRACT [52 vs. C]. 339/98 An electrical insulated wire connector in which a 51 Int. Cl H0lr 13/38 tinuous wire and p wire are held in y-  Field f S ar h 339/97 R, 97 P, 9 99 R channels in an insulating body having an integral selflocking cover and a slot in its side into which a slotted  References Cit d conductive insert is forced so that it penetrates the in- UNITED STATES PATENTS sulation of the wires and makes an electrical connection between them. 2,738,479 3/1956 Gibson 339/98 3,388,370 6/1968 Elm 339/98 7 Claims, 3 Drawing Figures U.S. Patent Nov. 18, 1975 3,920,305
1 NO-STRIP TAP CONNECTOR SUMMARY OF THE INVENTION to allow the insertion of a conductive insert with two parallel slots disposed one behind the other so that each slot pierces-the insulation of one of the wires lying in the channels of the body, thus making an electrical connection between them; The insulating body also has an integral self-locking cover flap to close over the open top and side of the body. Therefore an improved no-strip tap connector is a primary'object of this invention.
Another object is an improved no-strip tap connector in which the position of the fully inserted tap wire in the body of the connector can be clearly viewed before the electrical connection is made.
Another object is an improved no-strip tap connector in which the joining action is clearly visible as the metal insert is forced into the slot in the side of the insulating body.
Another object is an improved no-strip tap connector in which the slots are disposed one behind the other so that distortion of the insert as a slot is forced over a conductor wire will not affect the adjacent slot.
Another object is an improved no-strip tap connector in which the metal insert can be pre-positioned generally half way into the transverse slot such that the tap wire can be inserted through a hole in the conductive insert without the necessity of removing the insert.
Another object is an improved no-strip tap connector with a cover flap which can be opened by an inspector .to visibly expose the joint in the open slots.
Other objects will appear in the ensuing specification, drawings and claims.
BRIEF DESCRIPTION OF THE DRAWINGS showing the cover open and metal strip in position for receiving the wires to be connected; and,
FIG. 3 is the same view as FIG. 2 but shows the metal strip in the fully inserted contact position and the cover closed over the top and side and latched to the connector body below the slotted side.
DESCRIPTION OF THE PREFERRED EMBODIMENTS A no-strip tap connector is shown in. FIG. 1 consisting of a solid body 11 of insulating material and a conductive insert 12. Integral with and hinged to the connector body 11 is a cover flap l3.
The connector body 11 contains two longitudinal channels 14 and 15 for receiving the insulated wires to be connected. The continuous wire channel 14 extends through the entire length of the body and is open along the top to accept a continuous wire. The tap wire'channel 15 is open along the top and blocked by a stop surface 16 which the fully inserted tap wire abuts and which provides insulation for the exposed end of the tap wire. The connector body is slotted transversely intermediate its length by means of a side slot 17 through the outside wall 18 of the tap wire channel and a central slot 19 through the portion of the body 20 between the channels. Together they form a continuous linear slot open at its outer end 17 through the side and extending inward through the tap wire channel 15,
through the body portion 20 between the channels and into the continuous wire channel 14.
A conductive insert 12 is adapted to be slidably retained and inserted into the transverse slot. A slot 21 is cut into the inner end 22 of the insert 12 as is shown in FIG. 2 for penetrating the insulation of a wire in the continuous wire channel 14. Another similarly directed parallel slot 23 for penetrating the insulation of a wire in the tap wire channel 15 is disposed in the insert such that the longitudinal distance between the open ends of the slots is generally equal to the distance between the centerlines of the channels 14 and 15. The slots 21 and 23 are generally somewhat smaller than the smallest conductor of the insulated wire they are to engage.
In the embodiment shown in FIGS. 1-3, the tap wire slot 23 in the conductive insert 12 is part of a keyholeshaped aperture 24 made up of a hole 25 and slot 23. The hole 25 is generally equal in diameter to the width of the tap wire channel 15 and the slot 23 extends outward from the hole parallel to the inner slot 21. The ap-' erture 24 is positioned in theinsert such that the center of the hole 25 is positioned generally in line with the centerline of the tap wirechannel 15 when the inner end 22 of the insert is at the point of initial contact with the continuous wire channel 14.
Furthermore, in the embodiment shown in FIGS. l-3, the edges of the insert at the slotted end 22 are tapered in toward the slot 21 to facilitate directing the insert into the side slot 17 of the connector and the wireengaging open ends of the slots 21 and 23 in the conductive insert are flared away from the center line of the slots to aid in guiding the sides of the slots over the conductor wires as the insert is pressed through the insulation so as to prevent any part of the insert adjacent to the open end of a slot from abutting directly against a conductor wire. I
The. cover flap 13 which is an'integral part of the connector body 10 consists of three portions: a first portion 26 for covering the open channels 14 and 15 on the top of the connector, a second portion 27 for covering the slotted side 18 of the connector and a means for locking the cover flap in a closed position over the top and side. The means shown in the embodiment of FIGS. 1-3 consists of a continuous hooked lip 28 along the inside edge of the free end of the cover flap and a matching continuous hooked lip 29 along the bottom edge of the slotted side 18 of the connector. The cover flap 13 is connected to the body 10 by a continuous hinge 30 which is shown disposed along the top edge of the side of the connector adjacent to the continuous wire channel. The cover flap is shown in the closed and locked position in FIG. 3.
Examples of materials which may be used for the construction of this invention include a copper alloy such as brass for the conductive insert and polypropylene or polyallomer for the connector body.
The use, operation and function of the invention are as follows:
This connector is meant to make a no-strip tap connection of an insulated wire to a continuous insulated wire with pliers for the sole tool. To do this, the connector body is placed onto the continuous wire so that a portion of the wire loosing supported in the continuous wire channel. The tap wire is then inserted into the tap wire channel through either the open top or directly into the open end far enough so that its free end rests against the stop member in the channel. The insert may be prepositioned about half way into the connector body and the tap wire inserted through the large end of the keyhole so that the insert would not have to be moved in order to insert the wires. Thus one installation stepcould be eliminated which would save time and avoid the problem of loosoing separated parts. Now with the insert in its position of initial contact with the wires lying in the channels a pair of common pliers may be used to make the connection by pressing the free outer end of the insert on one side and the closed side of the connector body on the other side until the metal insert is fully within the connector body. The
cover flap can then be manually closed and snapped into locked position for a fast efficient electrical con-' nection.
An advantage of the present invention is the open view of the placement of the tap wire in its channel so the end of the wire is in visible proximity to the stop memberand the connection will be made on the conductor at a point other than the end of the wire. The joining action is also clearly visible after the wires are placed into their respective open-top channels and the conductive insert has been pressed through the wires. Because of the hinged cover the connector can later be opened by an inspector and the joint will be visible in the open slot. The clear visibility of this connector therefore assists in making a clean connection initially and later facilitates any necessary trouble-shooting.
The present invention has several other significant advantages. Each wire-receiving channel has a separate opening to the outside either through the top or its open end so as to avoid any problem of stretching the outermost channel caused by inserting more than one wire through one open slot. Also, the conductive insert is pressed into the inside of the connector body rela- 'tive to the electrical conductors so that the invention may be used in an application where the top and bottom of the connector are either inaccessible or inconveniently disposed. in addition, because of the end-to-,
end relationship of the slots in-the conductive insert, any distortion of a slot in the conductive insert as it is forced over its conductor wire will not effect adjacent slots since there is no common side member, between them.
Possible variations of the present invention include increasing the number of tap wire channels so as toconnect three or more wires, or a pigtail connector could be connected with two or more blocked slots.
The side slot for the conductive insert may be disposed at other than a right angle to the side of the connector body so as to help the insert penetrate the wire in'sulation. For easier molding of the side slot to hold the insert in a non-perpendicular attitude to the wire channels the bottom of the connector body could be hinged similarto the top. The hinge would be at the bottom of I the closed side of the connector body and additional latches: like the hooked lips along the. free endof the cover flap and bottom edgeof the open side of the con-' nector body would be required. The forces acting transverse across the connector body permit this construction alternative. g The wires, channels, slots etc have been shown with different sizes, but they might be the same or reversed; I Also, the slots 21 and 23 in the metal insert have been shown as generally coaxial and coextensive but itmight be otherwise. For example, the slots might be offset slightly but generally parallel which could be used to reduce the size of the unit.
While a preferred form and several variations of the I I invention have been disclosed, it should be understood that suitable additional modifications, changes, substitutions and variations may be made without departing from the inventionsfundamental theme. What is claimed is as follows: l. A no-striptap connector comprising a solid of insulating material with two longitudinal wirereceiving channels at least one of which extends through the entire length of the body and opens continuously'along the top surface of the body to accept a continuous wire, the other channel being for a tap wire and also opening directly along the top surface of the 7 body and containing a generally traverse stop surface, a transverse slot extending across the channels intermediate the length of the tap wire channel and opening through a longitudinal side of the body normal to the top surface, a conductive insert insertable into the transverse slot through said body side and having an end slot at one end to penetrate the insulation of a con? tinuous wire in the continuous wire channel, an insulation piercing slot adjacent theother end of the insert and generally aligned with the end slot for penetrating the insulation of a tap wire in the tap wire channelga cover flap integral with and hinged to the body and'of a size to cover the top and side so as to'close and cover the open channels and side slot, and means for locking the cover flap in a closed position over the topand side;
of the body.
2. The no-strip. tap connector of claim 1 wherein the 7 tap wire insulation piercing slot of the conductive insert is part of a keyhole-shaped aperture consisting of a tap wire-receiving hole and slot extending outward therefrom for piercing the insulation of the tap wire.
3. The no-strip tap connector of claim 2 wherein the I hole of the keyhole-shaped aperture is generally equal in diameter to the width of the tap wire channel and the I slot extends outward therefrom, said aperture beingpositioned in the insert such that with the inner end of the insert at the point of the initial contact with the continuous wire in the continuous wire channel the center of the hole of the keyhole-shaped aperture will be positioned generally in line with the center line of the tap' body I 5. The no-strip tap connector of claim 1 wherein the cover flap is hinged along the top edge of the side of the connector adjacent to the continuous wire channel and the means for locking the cover flap is disposed generally along and-adjacent to the lower edge of the slotted 1 side of the connector body. 2 6. The no-strip tap connector of claim 2 wherein th solid body of the connector contains one or more tap wire channels and the metal insert contains an equal number of keyhole apertures so that one or more tap wires may be connected to the continuous wire.
7. In a no-strip tap connector comprising a solid body a generally transverse stop surface across said other channel, I
a transverse slot having an opening through a longitudinal side of the body adjacent said other channel and extending through the other channel and body and into said one channel, the top surface of the body overlying and closing the transverse slot through the solid body, t
a conductive insert slidingly receivable into the transverse slot and having an end slot in one end to penetrate the insulation of a continuous wire in said one channel, a tap wire receiving hole for receiving a tap wire disposed in the other channel and an insulation piercing slot opening into the tap wire hole and generally aligned with the end slot for penetrating the insulation of a tap wire, and
an integral cover flap hinged to the body for closing the openings of the channels and transverse slot when closed and exposing the relative position of the conductive insert and wires in the channels when opened.
|Cited Patent||Filing date||Publication date||Applicant||Title|
|US2738479 *||Oct 4, 1951||Mar 13, 1956||Warren H Kintzinger||Plural wire stripper and electrical connector|
|US3388370 *||Apr 14, 1966||Jun 11, 1968||Minnesota Mining & Mfg||Solderless connector for insulated wires|
|US3793612 *||Mar 2, 1972||Feb 19, 1974||Minnesota Mining & Mfg||Connector with unitary hinge|
|Citing Patent||Filing date||Publication date||Applicant||Title|
|US4033661 *||Feb 23, 1976||Jul 5, 1977||Panduit Corporation||Solderless connector for insulated wires|
|US4037905 *||Dec 12, 1975||Jul 26, 1977||Ideal Industries, Inc.||No-strip electrical connector|
|US4041604 *||Jun 10, 1976||Aug 16, 1977||Amp Incorporated||Method of terminating an electrical wire in an insulating housing|
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|US4274198 *||Feb 9, 1979||Jun 23, 1981||Bunker Ramo Corporation||Self-stripping electrical terminal|
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|US4770642 *||Aug 29, 1983||Sep 13, 1988||Hoose James S Van||Ignition cable connector|
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|US20130257405 *||Mar 26, 2013||Oct 3, 2013||Abb Oy||Add-on boost converter for a solar energy system|
|EP0053488A1 *||Nov 26, 1981||Jun 9, 1982||Park Royal Porcelain Company Limited||Electrical sockets|
|U.S. Classification||439/418, 439/402, 439/408|