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Publication numberUS3912356 A
Publication typeGrant
Publication dateOct 14, 1975
Filing dateMay 28, 1974
Priority dateMay 28, 1974
Also published asCA1014634A, CA1014634A1
Publication numberUS 3912356 A, US 3912356A, US-A-3912356, US3912356 A, US3912356A
InventorsJohansson Ronald C
Original AssigneeMinnesota Mining & Mfg
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Solderless connector
US 3912356 A
Abstract  available in
Previous page
Next page
Claims  available in
Description  (OCR text may contain errors)

United States Patent 1191 Johansson Oct. 14, 1975 SOLDERLESS CONNECTOR 3,793,611 2/1974 Johansson er al 339/98 [75] Inventor: Ronald C. Johansson, Lake St.

,Crolx Beach Primary ExaminerJoseph H. McGlynn [73] Assignee; Minnesota Mining and Attorney, Agent, or FirmAlexander, Sell, Steldt &

Manufacturing Company, St. Paul, DeLaHunt 4 Minn.

[22] Filed: May 28, 1974 [57] ABSTRACT [21] Appl. No.: 473,329

A solderless wire-connector contains a slotted resilient 52 vs. C]. 339/98 metal Plate Contact element Slidably retained in a 51 1m. 01. H01R 9/08 grooved insulating y which y be Opened for [58] Field of Search 339/97-99 eral insertion of Wires by unfolding along a hinge area displaced from the plane of said wires. [56] References Cited Elm 339/98 3 Claims, 4 Drawing Figures US. Patent 0m. 14. 1975 3,912,356

SOLDERLESS CONNECTOR This invention relates to, solderless wire-connectors and in one particular aspect to tap connectors for making T or X connections to run wires. In a specific aspect the invention relates to improvements in solderless wire-connectors having a resilient slotted contact element in a plastic insulating body which may be temporarily unfolded for introduction of wires andwherein connection to the' wires is then made by forcefulinsertion of said contact element.

Solderless wire-connectors comprising a slotted contact element in a hinged insulating body have been described, for example in U.S. Pat. Nos. 3,388,370, 3,500,292 and 3,576,518. In these connectors the slotted metal plate contact element is forced over the wires to be connected, causing resilient spreading of the contact lobes. Where the outer lobe of the contact element is thus extended toward or into the hinge area, as in the connector of U.S. Pat. No. 3,388,370, the resulting stresses may cause eventual reduction in insulation value at that point. Increasing the thickness of the insulating body at the hinge area effectively avoids subsequent electrical breakdown but stiffens the hinge to the extent that the two halves of such a body cannot be easily separated a distance sufficient to permit lateral entry of the wire or wires. It has therefore been found necessary in such connectors to widen the longitudinal slots to a width equal to at least a major proportion of the diameter of the wire-channels. But the excess slot width, while permitting entry of wires without undue bending at the thickened hinge area, then permits subsequent movement of the wires within the channels, resulting eventually in deterioration of the electrical connection.

It has now been found possible to reduce the width of the wire entry slot or slots to a minimum and to permit extensive unfolding of the hinged body so as to obtain improved confinement and substantial immobility of the connected wires, while still avoiding any undue stressing or weakening at the hinge area during forceful insertion of the contact element, by relocating the hinge area along a line between the plane of the contact element entry face and the parallel plane nearest thereto and tangent to the adjacent wire-receiving channel.

In the drawing,

FIG. 1 is an exploded view in perspective of a preferred embodiment of the invention,

FIG. 2 is a top plan view of the insulating body of the connector of FIG. 1 with a portion cut away to show further detail,

FIG. 3 is an edge view, partly in section, of the body of FIG. 2 taken approximately at line 33 thereof, and

FIG. 4 is a view in perspective of another form of insulating body.

The connector of FIG. 1 consists of a one-piece body 11 of molded plastic insulation material, and a doubly folded slotted metal contact element 12. A single flat plate element as shown in US. Pat. No. 3,388,370 may equally well be employed but the improved body structure of the present invention more readily permits the more effective folded element to be used.

The body 11 is channeled to provide wire-receiving and wire-supporting channels 13, 14 and is slotted transversely of the channels to provide slots 15, 16, best seen in FIG. 2, for slidably receiving the element 12 which is inserted through'opening' 17 in the flat face 18 of the body. A cover 23 is connected to along hinge 31.

The body 11 is slotted along one edge to provide narrow edge slot 19,.and internally along slot 27 from channel 14 past a portion of channel 13 and to hinge area 20 extending along the opposite edge. The hinge area is between the plane of the flat top surface 18 and a second plane parallel thereto and tangent to the channel 13 at the line nearest said surface 18.

Channel 14 is open along the entire length of the body 11. Channel 13, on the other hand, is preferably closed at one end by end wall 21, which effectively insulates and protects a wire-end inserted endwise into the channel. The extension 22 of opening 17 permits inspection of the wire-end to make certain that it extends past the slot 15 and the contact element 12 prior to completing the connection.

The body is thickened centrally along the hinged edge to form a band 30 extending over the adjacent ends of the channels l5, 16. The band continues across the bottom face of the body in a series of longitudinal ridges 32, forming a reinforced surface against which force is applied, e.g., with pliers or press, in driving the contact element into the insulating body and over the insulated wires.

In making a T-connection a wire-end is inserted in channel 13, the two sections of the body are spread apart about the hinge 20, and a run-wire is inserted laterally through the temporarily widened channel 19. The contact element 12 is forced into the body and onto the wires, and the cover 23 is then folded over the face of the body and the end section 24 is snapped in place over the extended edges 25, 26. The edge slot 19 is substantially fully closed and the wires are firmly held within the channels.

As the contact element 12 is forced over the wires supported in channels l3, 14, the outer contact lobes 28, 29 of the element are forced outwardly and lobes 28 tend to stress the plastic body at the ends of the slots l5, 16. Due to its novel placement, the hinge area 20 is not affected and retains its full strength and thickness, thereby avoiding any decrease in insulating qualities at the point of impact. The thickness of the band 30 provides continued full insulation over the lobes 28.

The body 40 of FIG. 4 differs from body 11 of FIGS. 1 and 2 in the position of the slot extending from the hinge area to the run-wire channel 44. Whereas in the structure shown in FIG. 1 a single extended slot 27 is provided, the body 40 is doubly slotted, at slot 41 between the two wire-receiving channels 43, 44 and again at slot 47 extending from the inner channel 43 to the hinge area 50, in addition to the edge slot 49. This structure likewise permits the hinge area to be located between the parallel planes as defined in conjunction with FIG. 1. FIG. 4 additionally illustrates a modification in which the end wall 21 of FIG. 1 is omitted, and which therefore permits the interconnecting of two run-wires in an X-connection.

Whereas the invention has herein been described in terms of connectors for making connection between two wires, it will be recognized that connectors for three or more wires may equally well be constructed in accordance with the principles of the invention.

What is claimed is as follows:

1. A solderless wire-connector comprising a onepiece insulative body member and a resilient conducthe body tive contact element, said body member having opposing side edges and a flat face, being channeled to provide parallel longitudinal wire-receiving and wiresupporting channels, and being slotted from said face and transversely of said channels to receive said contact element, said element being slotted in line with said channels to provide open-ended wire-receiving slots, said body being formed with a narrow slot between one of said edges and the adjacent one of said channels, and being formed with a further slot extending from said one channel and terminating at a body hinge area, said body hinge area being located along through the channel adjacent said hinge area.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US3388370 *Apr 14, 1966Jun 11, 1968Minnesota Mining & MfgSolderless connector for insulated wires
US3793611 *Mar 2, 1972Feb 19, 1974Minnesota Mining & MfgConnector
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4041604 *Jun 10, 1976Aug 16, 1977Amp IncorporatedMethod of terminating an electrical wire in an insulating housing
US4274198 *Feb 9, 1979Jun 23, 1981Bunker Ramo CorporationSelf-stripping electrical terminal
US4420211 *Aug 10, 1981Dec 13, 1983Belden CorporationFlat electrical cable splicer
US4701138 *Dec 18, 1986Oct 20, 1987Phoenix Terminal Blocks Inc.Solderless electrical connector
US4861278 *Apr 26, 1988Aug 29, 1989American Telephone And Telegraph Company, At&T Bell LaboratoriesConnector for drop wire and other conductors
US4889006 *Mar 24, 1988Dec 26, 1989Briggs & Stratton CorporationEngine speed control cable clip attachment
US4954098 *Nov 1, 1989Sep 4, 1990Minnesota Mining And Manufacturing CompanySealed insulation displacement connector
US5080606 *Nov 5, 1990Jan 14, 1992Minnesota Mining And Manufacturing CompanyStacked in-line insulation displacement connector
US5113037 *Aug 30, 1990May 12, 1992King Technology Of Missouri, Inc.Waterproof wire connector
US5211575 *Jun 23, 1992May 18, 1993Buchanan Construction Products, Inc.Insulated pigtail device
US5520549 *Oct 19, 1994May 28, 1996Minnesota Mining And Manufacturing CompanyConnector apparatus, housing, and connecting element
US5606150 *Jul 25, 1995Feb 25, 1997The Whitaker CorporationEnclosure for spliced cable
US5691508 *Oct 31, 1995Nov 25, 1997The Whitaker CorporationEnclosure for spliced multiconductor cable
US5746610 *Nov 26, 1996May 5, 1998The Whitaker CorporationGround contact for a splice enclosure
US6050841 *Feb 16, 1999Apr 18, 2000Chen; JoeElectric connector
US7275282 *Feb 18, 2005Oct 2, 2007Brose Schliesssysteme Gmbh & Co. KgMotor vehicle door lock
US20050194794 *Feb 18, 2005Sep 8, 2005Brose Schliesssysteme Gmbh & Co., KgMotor vehicle door lock
USRE37340Jul 16, 1997Aug 28, 2001King Technology Of Missouri, Inc.Wire junction encapsulating wire connector and method of making same
WO1992008256A1 *Sep 26, 1991May 14, 1992Minnesota Mining And Manufacturing CompanyStacked in-line insulation displacement connector
U.S. Classification439/400, 439/402
International ClassificationH01R4/24
Cooperative ClassificationH01R4/2454
European ClassificationH01R4/24B6B1