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Publication numberUS2787769 A
Publication typeGrant
Publication dateApr 2, 1957
Filing dateJul 14, 1953
Priority dateJul 14, 1953
Publication numberUS 2787769 A, US 2787769A, US-A-2787769, US2787769 A, US2787769A
InventorsHill Ezra C, Proxmire Harry J
Original AssigneeGen Electric
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Tapped coil
US 2787769 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)

April 2, 1957 E. c. HILL ET AL 2,787,769

TAPPED COIL Filed July 14-, 1953 may The/r A ttor/yy TAPPED COIL Ezra C. Hill and Harry J. Proxmire, Fort Wayne, Ind.,as-

signors to General Electric Company, a corporation of New York Application July 14, 1953, Serial No. 367,858

6 Claims. (Cl. 336-492) This invention relates to coils for inductive devices and more particularly coils having a tap.

In the design of inductive devices, such as transformers, it is frequently necessary to provide a coil having a tap, i. e. a connection brought out intermediate the ends of the coil. When the coil is .a high voltage coil and thus wound with fine wire, insulation problems have made it difiicult to bring out a tap and therefore in the past, it has been conventional practice to provide two separate coils with the end connections between the two coils providing the tap.

It is therefore desirable that a coil construction be provided which will permit bringing out a tap therefrom without the necessity for splitting the coil into two separate coils and further which will provide an anchor for the lead attached to the coil tap.

It is therefore an object of this invention to provide an improved tapped coil construction incorporating the desirable features set forth above.

Further objects and advantages of this invention will become apparent and the invention will be better understood by reference to the following description and the accompanying drawing, and the features of novelty which characterize this invention will be pointed out with particularity in the claims annexed to and forming a part of this specification.

In accordance with this invention, a coil body is provided wound on a spool and having a plurality of layers of wire. One or more, preferably two axially extending tubular members are wound between two of the coil layers at or near the point where the tap is to be brought out. A tap is taken from the coil body and connected to one end of an external tap lead. This connection is then positioned in one of the tubular members and the external lead extends through the other of the tubular members thereby anchoring the tap lead to the coil body.

In the drawing, Fig. 1 is a view in perspective, partially broken away, illustrating the improved tapped coil construction of this invention; and

Fig. 2 is a similar view illustrating the method of making the tapped connection of Fig. 1.

Referring now to the drawing, there is shown a high voltage coil, generally identified as 1 having a plurality of layers 2 of relatively fine wire wound on a spool 3. In order to provide for bringing out a tap from the coil 1, a pair of spaced apart axially extending tubular members 4 and 5, formed of suitable insulating material, are wound between two of the layers of the coil in the region from which the tap is to be brought out. These tubular members extend through substantially the entire axial length of the coil 1, as clearly shown in Figs. 1 and 2. To form the tap, a single coil of wire is pulled away from the outside of one of the layers forming a tap loop 6 as shown in Fig. 2. The tap loop 6 is connected to an end 7 of external tap lead 8 and this connection is then soldered, as at 9 in Fig. 1. The soldered connection 9 together with the adjacent portions of the tap loop 6 and external tap lead 8 are inserted in the tubular mem- United States P t O 2,787,769 Patented Apr. 2, i957 her 4, as shown in Fig. 1. External tap lead 8 is then brought through the other tubular member 5 with its other end 10 being on the side of the coil 1 remote from the side from which the tap loop 6 was taken. The finished coil may be bound together in any suitable manner, as by tape 11 which may also anchor the other external leads, one of which is shown at 12.

it will now be readily seen that this improved tapped coil construction securely anchors the tap lead to the coil and that since all parts of the tap lead and coil loop are confined to the portion of the coil body where the tap occurs, there are no points of high potential gradient between the tap lead and the coil as are created by conventional methods of bringing out and anchoring tap leads. Here it will be seen that no reasonable amount of pulling on the end 10 of the tap lead 8 or ordinary movement of lead will cause strain or breakage of the fine wire forming the tap loop 6.

While the improved lead anchoring arrangement of this invention has been shown in connection with a tap, it will be readily understood that it may also be used for making end connections as well as for tap connections. While two tubular members are shown, it will also be readily understood that only one more than two may be utilized.

While we have shown and described a particular embodiment of this invention, further modifications and improvements will occur to those skilled in the art. We desire that it be understood therefore that this invention is not limited to the form shown and we intend in the appended claims to cover all modifications which do not depart from the spirit and scope of this invention.

What we claim as new and desire to secure by Letters Patent of the United States is:

1. A tapped coil comprising a coil body having a plurality of layers of wire, a pair of axially extending tubular members formed of insulating material arranged between two of said coil body layers, said coil body having a tap taken from one side thereof, and an external tap lead, one end of said tap lead being connected to said coil body tap, said connection being positioned in one of said tubular members, said tap lead passing through the other of said tubular members and extending from the side of said coil body opposite from said one side thereby anchoring said tap lead to said coil body.

2. A tapped coil comprising a coil body having a plurality of layers of wire, a pair of axially extending tubular members formed of insulating material arranged between two of said layers, said coil body having a tap taken from one side thereof, and an external tap lead, one end of said tap lead being connected to said coil body tap, said connection and adjacent portions of said tap and tap lead being positioned in one of said tubular members, said tap lead passing through the other of said tubular members and extending from the side of said coil body opposite from said one side thereby anchoring said tap lead to said coil body.

3. A tapped coil comprising a coil body having a plurallity of layers of wire, a pair of spaced apart axially extending tubular members formed of insulating material wound between two of said coil body layers, said coil body having a tap loop taken from one layer thereof on one side of said coil body, and an external tap lead, one end of said tap lead being connected to said coil body tap loop, said connection and adjacent portions of said tap loop and said tap lead being inserted in one end of one of said tubular members, said tap lead passing through the other of said tubular members and extending from the side of said coil body opposite from said one side thereby anchoring said tap lead to said coil body.

4. A tapped coil comprising a coil body wound on a spool and having a plurality of layers of relatively fine wire, a pair of axially extending tubular members formed of insulating material wound between two of said coil body layers and extending through substantially the axial length of said coil body, said coil body having a tap taken from one side thereof, and an external tap lead, one end of said tap lead being connected to said coil body tap, said connection and adjacent portions of said tap and tap lead being inserted in one end of one of said tubular members, said tap lead passing through the other of said tubular members and extending from the side of said coil body opposite from said one side thereby anchoring said tap lead to said coil body.

5. A tapped coil comprising a coil body wound on a spool and having a plurality of layers of relatively fine wire, a pair of spaced apart axially extending tubular members formed of insulating material wound between two of said coil body layers and extending through substantially the axial length of said coil body, said coil body having a tap loop taken from the outside coil of one layer thereof on one side of said coil body, and an external tap lead, one end of said tap lead being connected to said coil body tap loop, said conection and adjacent portions of said tap loop and said tap lead being positioned in one of said tubular members, said tap lead passing through the other of said tubular members and extending from the side of said coil body opposite from said one side thereby anchoring said tap lead to said coil body.

6. A coil comprising a coil body having a plurality of layers of wire, a pair of axially extending tubular members formed of insulating material arranged btween two of said coil body layers, said coil body having a lead taken from one side thereof, and an external lead, one end of said external lead being connected to said coil lead, said connection being positioned in one of said tubular members, said external lead passing through the other of said tubular members and extending from the side of said coil body opposite from said one side thereby anchoring said external lead to said coil body.

References Cited in the file of this patent UNITED STATES PATENTS

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US1968600 *Jun 9, 1933Jul 31, 1934Gen ElectricElectrical winding
US2072635 *Feb 27, 1936Mar 2, 1937Chicago Transformer CorpTerminal board
US2154070 *Jul 16, 1936Apr 11, 1939Western Electric CoElectrical coil
US2184272 *Dec 17, 1937Dec 26, 1939Gen ElectricElectrical winding
US2633481 *Nov 9, 1949Mar 31, 1953Foster Transformer CompanyTerminal board for multitap transformer construction
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2985950 *Feb 6, 1959May 30, 1961Advance Transformer CoMethod of manufacturing coils
US3047935 *Nov 27, 1956Aug 7, 1962Western Electric CoMethod of making toroidal coils
US4700167 *Aug 29, 1986Oct 13, 1987General Signal CorporationBobbin construction with strain relief
US4808959 *Mar 31, 1988Feb 28, 1989Magnatek Universal ManufacturingElectrical coil with tap transferring to end-layer position
US5078674 *Sep 7, 1990Jan 7, 1992Cadwll Industries, Inc.Magnetic stimulator coils
US8466767Jul 20, 2011Jun 18, 2013Honeywell International Inc.Electromagnetic coil assemblies having tapered crimp joints and methods for the production thereof
US8572838Mar 2, 2011Nov 5, 2013Honeywell International Inc.Methods for fabricating high temperature electromagnetic coil assemblies
US8754735Apr 30, 2012Jun 17, 2014Honeywell International Inc.High temperature electromagnetic coil assemblies including braided lead wires and methods for the fabrication thereof
US8860541Oct 18, 2011Oct 14, 2014Honeywell International Inc.Electromagnetic coil assemblies having braided lead wires and methods for the manufacture thereof
US9027228Nov 29, 2012May 12, 2015Honeywell International Inc.Method for manufacturing electromagnetic coil assemblies
US9076581Apr 30, 2012Jul 7, 2015Honeywell International Inc.Method for manufacturing high temperature electromagnetic coil assemblies including brazed braided lead wires
Classifications
U.S. Classification336/192, 335/299, 29/605
International ClassificationH01F41/10
Cooperative ClassificationH01F41/10
European ClassificationH01F41/10