US3343113A - Electrical coil assemblies - Google Patents

Description

I P 1967 J. DOUGALL 3,343,113

ELECTRICAL COIL ASSEMBLIES Filed July 26, 1965 United States Patent 3,343,113 ELECTRICAL COIL ASSEMBLIES John Dougall, Birmingham, England, assignor to Joseph Lucas (Industries) Limited, Birmingham, England Filed July 26, 1965, Ser. No. 474,692 Claims priority, application Great Britain, Aug. 7, 1964, 32,17 3/ 64 1 Claim. (Cl. 336-192) This invention relates to electrical coil assemblies of the kind comprising a generally cylindrical body of electrically insulating material, upon which is wound a length of electrically conducting wire, the ends of which are connected to terminal pieces.

The object of the invention is to provide a coil assembly of the kind specified, in a convenient form.

According to the present invention, a coil assembly of the kind specified is characterised in that the terminal pieces are of plate-like form and are secured to lugs extending from the body and formed integrally therewith, these lugs being formed with respective apertures for the reception of a tool or a part thereof for making an electrical connection between. the wire end and terminal pieces.

The body may be formed with a generally radially extending slot in one of a pair of flanges bounding the portion of the body on which the wire is wound, the slot extending across substantially the whole of the radial width of the coil of wire.

A specific example of the invention will now be described by way of example with reference to the accompanying drawings in which:

FIGURE 1 is a side elevation view of a coil assembly constructed in accordance with the invention and FIGURE 2 is a plan view of the assembly.

In this example there is provided an electrical coil assembly comprising a body formed from an electrically insulating material such as a synthetic resinous material. The body is formed by an injection moulding process and is of generally hollow cylindrical form with two outwardly extending annular flanges at opposite ends respectively. One of the annular flanges has formed integrally therewith a pair of generally radially outwardly extending apertured lugs 11, 12. Each of the lugs 11, 12 has a first aperture 13 for reception of a tool and a second aperture 14 for reception of a fastening element for an electrical lead.

Each lug 11 or 12 is also formed with a pair of integral projections 16 arranged to engage in holes in an electrically conducting apertured plate-like terminal piece 17 or 18 assembled in face-to-face relationship with the lug 11 or 12. To secure the terminal pieces in place on the respective lugs, the ends of the projections 16, are pressed to form heads.

The terminal pieces 17, 18 extend over the apertures 13 in the lugs 11, 12 respectively, and opposite ends of 3,343,113 Patented Sept. 19, 1967 ice a length of wire 19 coiled on the body 10 between the annular flanges, are connected to the terminal pieces 17, 18 respectively by means of respective bent over tabs 20, formed on the terminal pieces 17, 18, the wire ends being secured in place by resistance welding. One of the portions of a tool used in carrying out this resistance welding process is passed through the aperture 13 in the appropriate lug. Each tab 20 has a V-shaped slot for the wire, to hold this in place prior to welding, the respective slots being indicated by numerals 24, 25.

The apertures 14 in the lugs 11, 12 are aligned with those in the terminal pieces respectively, the fastening elements thus making electrical connection with the terminal pieces.

The body 10 has a pair of integral projections 21 which are arranged to engage in a support bracket for the assembly the ends of those projections 21 being pressed to form heads. In the annular flange of the body 10 on which the lugs are formed and nearer one of the lugs than the other is a'slot 22 extending generally radially of the body. This slot 22 extends over substantially the whole radial width of the flange and is provided to facilitate retrieval of the end of the wire 19 at the inside of the coil, when this end of the wire is to be connected to a terminal piece. A portion of the flange on the side on which the coil is wound is of reduced thickness as indicated by the dotted line 23, thus defining a cavity for the end of the wire.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is:

An electrical coil assembly comprising a generally cylindrical body of electrically insulating material, the body having integral flanges at the ends thereof respectively, a pair of integral lugs extending from the body, a length of electrically conducting wire wound on the body, a pair of plate-like terminal pieces mounted upon the lugs respectively, means for connecting the ends of the wire onto the terminal pieces, and the lugs being formed with respective apertures for reception of a tool whereby said means for connecting the wire to the terminal pieces can be manipulated.

References Cited UNITED STATES PATENTS 1,100,178 6/1914 Forsberg 336-192 X 1,360,752 11/1920 Johannesen 336-192 X 2,453,158 1l/1948 Price 336-192 2,828,393 3/ 1958 Wingard.

3,117,294 1/1964 Muszynski 336-192 3,142,030 7/1964 Lenox 336-192 X 3,230,489 1/1966 Weyrich 336-192 DARRELL L. CLAY, Primary Examiner.

L. H. MYERS, Examiner.

E. A. GOLDBERG, Assistant Examiner.

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