|Publication number||US3912356 A|
|Publication date||Oct 14, 1975|
|Filing date||May 28, 1974|
|Priority date||May 28, 1974|
|Also published as||CA1014634A, CA1014634A1|
|Publication number||US 3912356 A, US 3912356A, US-A-3912356, US3912356 A, US3912356A|
|Inventors||Johansson Ronald C|
|Original Assignee||Minnesota Mining & Mfg|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (2), Referenced by (19), Classifications (5)|
|External Links: USPTO, USPTO Assignment, Espacenet|
United States Patent 1191 Johansson Oct. 14, 1975 SOLDERLESS CONNECTOR 3,793,611 2/1974 Johansson er al 339/98  Inventor: Ronald C. Johansson, Lake St.
,Crolx Beach Primary ExaminerJoseph H. McGlynn  Assignee; Minnesota Mining and Attorney, Agent, or FirmAlexander, Sell, Steldt &
Manufacturing Company, St. Paul, DeLaHunt 4 Minn.
 Filed: May 28, 1974  ABSTRACT  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  Field of Search 339/97-99 eral insertion of Wires by unfolding along a hinge area displaced from the plane of said wires.  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.
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|US3388370 *||Apr 14, 1966||Jun 11, 1968||Minnesota Mining & Mfg||Solderless connector for insulated wires|
|US3793611 *||Mar 2, 1972||Feb 19, 1974||Minnesota Mining & Mfg||Connector|
|Citing Patent||Filing date||Publication date||Applicant||Title|
|US4041604 *||Jun 10, 1976||Aug 16, 1977||Amp Incorporated||Method of terminating an electrical wire in an insulating housing|
|US4274198 *||Feb 9, 1979||Jun 23, 1981||Bunker Ramo Corporation||Self-stripping electrical terminal|
|US4420211 *||Aug 10, 1981||Dec 13, 1983||Belden Corporation||Flat electrical cable splicer|
|US4701138 *||Dec 18, 1986||Oct 20, 1987||Phoenix Terminal Blocks Inc.||Solderless electrical connector|
|US4861278 *||Apr 26, 1988||Aug 29, 1989||American Telephone And Telegraph Company, At&T Bell Laboratories||Connector for drop wire and other conductors|
|US4889006 *||Mar 24, 1988||Dec 26, 1989||Briggs & Stratton Corporation||Engine speed control cable clip attachment|
|US4954098 *||Nov 1, 1989||Sep 4, 1990||Minnesota Mining And Manufacturing Company||Sealed insulation displacement connector|
|US5080606 *||Nov 5, 1990||Jan 14, 1992||Minnesota Mining And Manufacturing Company||Stacked in-line insulation displacement connector|
|US5113037 *||Aug 30, 1990||May 12, 1992||King Technology Of Missouri, Inc.||Waterproof wire connector|
|US5211575 *||Jun 23, 1992||May 18, 1993||Buchanan Construction Products, Inc.||Insulated pigtail device|
|US5520549 *||Oct 19, 1994||May 28, 1996||Minnesota Mining And Manufacturing Company||Connector apparatus, housing, and connecting element|
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|US5691508 *||Oct 31, 1995||Nov 25, 1997||The Whitaker Corporation||Enclosure for spliced multiconductor cable|
|US5746610 *||Nov 26, 1996||May 5, 1998||The Whitaker Corporation||Ground contact for a splice enclosure|
|US6050841 *||Feb 16, 1999||Apr 18, 2000||Chen; Joe||Electric connector|
|US7275282 *||Feb 18, 2005||Oct 2, 2007||Brose Schliesssysteme Gmbh & Co. Kg||Motor vehicle door lock|
|US20050194794 *||Feb 18, 2005||Sep 8, 2005||Brose Schliesssysteme Gmbh & Co., Kg||Motor vehicle door lock|
|USRE37340||Jul 16, 1997||Aug 28, 2001||King Technology Of Missouri, Inc.||Wire junction encapsulating wire connector and method of making same|
|WO1992008256A1 *||Sep 26, 1991||May 14, 1992||Minnesota Mining And Manufacturing Company||Stacked in-line insulation displacement connector|
|U.S. Classification||439/400, 439/402|