US3546647A - Electric coil construction - Google Patents
Electric coil construction Download PDFInfo
- Publication number
- US3546647A US3546647A US848451A US3546647DA US3546647A US 3546647 A US3546647 A US 3546647A US 848451 A US848451 A US 848451A US 3546647D A US3546647D A US 3546647DA US 3546647 A US3546647 A US 3546647A
- Authority
- US
- United States
- Prior art keywords
- coil
- spool
- cap
- primary
- extending
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F38/00—Adaptations of transformers or inductances for specific applications or functions
- H01F38/12—Ignition, e.g. for IC engines
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F38/00—Adaptations of transformers or inductances for specific applications or functions
- H01F38/12—Ignition, e.g. for IC engines
- H01F2038/122—Ignition, e.g. for IC engines with rod-shaped core
Definitions
- a construction for an electric coil which includes a one-piece hollow coil spool of a molded plastic material for positioning and supporting the primary and secondary windings within the coil can.
- the spool has a hollow cylindrical surface with spaced-apart circular flanges to define a support surface for the primary winding and a hollow interior having a closed lower end for receiving and supporting the secondary winding.
- a supporting leg at the lower end of the spool extends a radial distance substantially equal to the diameter of the coil can to coaxially position and support the spool and windings within the coil can.
- This invention relates to an improved construction for an electric coil which includes a molded plastic spool for positioning and supporting the primary and secondary coil windings within the coil can.
- a molded plastic spool for positioning and supporting the primary and secondary coil windings within the coil can.
- the use of the molded plastic spool of this invention simplifies the assembly of the coil constructions and has eliminated certain undesired variables which occurred in the production of prior art coils in which the winding support members were fabricated from materials requiring the use of fasteners such as staples or from layers of heavy paper between each of the primary layers.
- the primary and secondary windings are coaxially positioned on a laminated iron core and are placed within a cylindrical hollow coil can having a closed bottom and an open top which is closed by a molded coil cap.
- the coil can and cap are joined by crimping the edge of the can over a lip on the edge of the cap after the windings, spool and core iron have been inserted in the can and proper electrical connections have been made.
- FIG. 1 is a cross-sectional view in elevation of a complete coil construction using the improved coil spool of this invention
- FIG. 2 is a view in elevation of the coil spool used in the coil shown in FIG. 1;
- FIG. 3 is a bottom end view of the coil spool shown in FIG. 2. taken along line 33 of FIG. 2;
- FIG. 4 is a top end view of the coil spool shown in FIG. 2, taken along line 4-4 of FIG. 2;
- FIG. 5 is a view in elevation, partly in cross section, of an alternate embodiment of a coil spool.
- FIG. 6 is a bottom end view of the coil spool shown in FIG. 5, taken along line 66 of FIG. 5.
- the coil construction includes a metallic coil can 10 having a closed bottom 11 and an open top upon which is secured a coil cap, generally designated by reference numeral 12.
- the outer edge of the coil cap 12 has a rim 13 which, when assembled to the coil can 10, is placed between a gasket 14 and a steel washer 15 over which the edge 16 of the can 10 is crimped.
- a positive terminal 17 and a negative terminal 18 extend through the molded cap 12, as shown, and the high tension wire connection is centrally positioned within an upwardly-extending sleeve 19 which is coaxial with the coil can 10 and cap 12.
- the unitary molded plastic coil spool which supports, on its outer periphery, a primary winding 21.
- a secondary winding 22 which surrounds a laminar iron core 23 which extends substantially throughout the height of the coil can It ⁇ and rests upon the bottom of the plastic spool 20, as will be subsequently explained.
- connection of the coil may be varied to obtain certain advantages in output characteristics.
- the connections as follows are for illustrative purposes and are not deemed to constitute a part of this invention.
- One end of the primary winding 21 is connected by a lead 24 to the lower end of the positive terminal 17, while the other end of the primary winding 21 is connected by a lead 25 to the lower end of the negative terminal 18.
- One end of the secondary winding 22 is connected by a lead 26 to the bottom of a positive terminal 17, while the other end of the secondary winding 22 is connected to a conductive strip 27 which lies adjacent the laminar core 23 and has an end extending over the top of the core stack, as indicated by reference numeral 28.
- connection between the second end of the secondary winding 22 and the conductive strip 27 is schematically shown in FIG. 1 as designated by reference numeral 29, and in practice would be a soldered connection at the innermost layer of the secondary winding 22.
- a metallic terminal 30 within the sleeve 19 on the cap 12 is connected by a metallic fastener, such as a screw 31, which extends through the cap 12 and bears against a conductive spring member 32 which is in electrical contact with the end 28 of the conductive strip 27.
- the coil spool 20 in its preferred form includes a hollow cylindrical member 33 having a pair of aXially-spaced-apart, upper and lower circular flanges 34 and 35, respectively, which extend radially outwardly from the outer surface of the cylindrical member 33 a distance greater thanthe depth of the primary winding 21, as seen in FIG. 1.
- This has the advantage of preventing the outermost layer of turns of the primary winding 21 from striking any portion of the coil can or its associated liners during the installation of the windings and spool within the can 10.
- the flanges 34 and 35 assist in maintaining the spool and windings in coaxial alignment with the coil can 10 for insertion of the coil cap 12, as will be subsequently explained.
- a circular rim 36 Extending above the upper flange 34 is a circular rim 36 whose inside diameter is adapted to receive a downwardly-extending skirt 37 on the underside of the cap 12, as shown in FIG. 1.
- the skirt 37 need not be a circular protrusion but can be at least three separate ribs which fit snugly inside the circular flange 35 so that, when the cap is installed upon the can in the manner previously described, the windings 21 and 22, core 23, and spool 20 are positioned and held coaxially with the can.
- the bottom edge of the skirt 37 bears firmly into the top of the secondary winding 22, which in turn applies pressure to the land 39 preventing any longitudinal movement of the winding 22, and spool 20. Longitudinal movement of the core 23 is prevented by compression of the conductive spring member 32 between the top of the core 23 and contact 31.
- a supporting portion including an inverted frustoconical sleeve 38 whose larger upper diameter is smaller than the diameter of the cylindrical member 33 and is joined thereto by a radially-extending interior land 39.
- the smaller lower diameter of the frustoconical sleeve 38 has a closed bottom 40 which is supported by a pair of radially-extending legs 41 and 42, best seen in FIG. 3.
- the length of each of the legs 41 and 42 is substantially equal to the effective interior diameter of the coil can 10 plus its linings, as seen in FIG. 1, so that the spool 20, with the primary winding 21 wound thereon, is coaxially positioned within the can by the legs 41 and 42 alone.
- an aperture 43 through the Wall of the spool adjacent the upper flange 34 is provided so that one end of the primary winding 21 may be led to the interior of the spool for connection to the lead 24 which connects to the positive terminal 17, as shown in FIG. 1.
- the aperture 43 also serves to accept a driver on the arbour when winding the primary winding 21 onto the bobbin.
- the secondary winding 22 is positioned within the cylindrical member 33 of the spool 20 with its lower edge resting upon the land 39.
- the laminated core 23 extends through the annular secondary winding 22 with its bottom end resting upon the bottom 4.0 of the spool with its top end in electrical contact with the end 28 of the conductive strip- 27, as previously explained.
- the windings 21 and 22 are held in concentric relation about the axis of the can 10 and the core 23 by the spool 20 which is positioned concentrically within the can 10 by the skirt 37 at the upper end and by the legs 41 and 42 at the lower end.
- the flanges 34 and 35 extend radially outwardly beyond the outer surface of the primary winding 21 to prevent any possibility of these turns being shorted against the interior of the can 10 if, for example, the can becomes dented or otherwise misshapen.
- additional conductive layers 44 and 45 of a magnetic material in the form of semicircular shims may be placed alongside the interior of the walls of the can 10, along with a tubular cardboard sheet 46.
- the layers 44 and 45 increase the permeability along the walls of the can, and thus increase the transformer efliciency of the coil, while the cardboard 46, which may be eliminated, will assure that the primary or connecting leads would not be shorted out against the walls of the can, should an extreme dent occur in this area.
- the secondary 22 is positively separated from the primary winding 21 by the walls of the cylindrical member .33, and the laminated core 23 is separated from the can 10 by the bottom 40 and legs 41 and 42 of the spool 20, and by the non-conductive cap 12.
- the use of the molded spool 20 of this invention practically eliminates any possibility of shorting the windings 21 and 22 against each other or against portions of the can 10.
- the leads 24, 25 and 26 are partially guarded by portions of the spool 20 and by the skirt 37 so that they cannot be moved by vibration into undesired contact with any other metallic portion in the construction.
- FIGS. 5 and 6 an alternate embodiment of the spool 20 is shown which is essentially similar to the preferred embodiment shown in FIG. 2, but in which the lowermost portion, instead of having radially-extending legs 41 and 42, has a pair of arcuateshaped flanges 47 and 48 extending outwardly from the lower cylindrical portion of the spool 20, as indicated.
- the interior details of this embodiment of the spool 20 are the same, and the use and function are identical with those previously described.
- the diametrical distance between the outer edges of the flanges 47 and 48 is again substantially equal to the effective interior diameter of the can 10.
- the coil spool 20 of this invention is conveniently molded from any plastic material which will have the suflicient mechanical strength to withstand the vibration encountered in automotive installations and which, of course, has satisfactory insulating characteristics.
- the particular plastic used should not be absorbent with or reactive to the coil fluid, and should be able to withstand operating temperatures as high as 325 F.
- a preferred material has been found to be asbestos-filled nylon which is available from a number of commercial sources, such as Piberfil Division, Dart Industries, Inc., Evansville, Ind. 47717.
- Other suitable molding materials having the desired characteristics will be apparent to those skilled in the art, and it is emphasized that the identity of the particular plastic material is not deemed to constitute a part of this invention.
- a unitary hollow spool having a cylindrical bore adapted to receive and support the secondary winding of said coil, a pair of axially-spaced-apart circular flanges extending around the outer surface of said spool, said flanges having a diameter slightly less than the diameter of the bore of said coil can whereby said spool may be slidably positioned in coaxial alignment therewith, and a spool-supporting foot extending axially below said spool and adapted to rest upon the closed lower end of said coil can to support said spool and said windings at a position coaxially intermediate the upper and lower ends of said coil can.
- said coil spool further includes an annular rim extending above the uppermost circular flange and having an internal diameter adapted to snugly receive the lowermost portions of said coil cap to further secure said spool in coaxial alignment with said coil can.
- said spool-supporting foot includes at least two opposed radial legs extending across the closed lower end of said coil can to support said spool within said can.
- said spool-supporting foot comprises a hollow, frustoconical sleeve extending below the lowermost circular flange with a closed lower end.
- the electric coil construction of claim 5 which further includes at least two opposed radial legs extending below said closed end of said frustoconical sleeve and across the closed lower end of said coil can to support said spool within said can.
- a unitary molded plastic coil spool for positioning and supporting the primary and secondary windings of an electric coil within a cylindrical coil can having a closed lower end and an open upper end with a coil cap secured thereto, said spool comprising a hollow cylindrical member,
- a pair of axially-spaced-apart circular flanges extending around the outer surface of said cylindrical member to define a surface between said flanges for sup porting the primary winding thereon, said flanges having a radial depth greater than the depth of said primary winding whereby the outer turns thereof are held in spaced relation from the adjacent interior surface of said coil can when said spool and primary winding are inserted therein,
- At least one radially-extending support leg below said closed bottom of said sleeve having a length substantially equal to the diameter of said coil can.
- the coil spool of claim 8 which further includes an annular rim extending above the uppermost circular flange and having an internal diameter adapted to snugly receive the lowermost portions of said coil cap to further secure said spool in coaxial alignment with said coil can.
Description
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US84845169A | 1969-08-08 | 1969-08-08 |
Publications (1)
Publication Number | Publication Date |
---|---|
US3546647A true US3546647A (en) | 1970-12-08 |
Family
ID=25303309
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US848451A Expired - Lifetime US3546647A (en) | 1969-08-08 | 1969-08-08 | Electric coil construction |
Country Status (4)
Country | Link |
---|---|
US (1) | US3546647A (en) |
JP (1) | JPS5150976Y1 (en) |
FR (1) | FR2057059B3 (en) |
GB (1) | GB1312847A (en) |
Cited By (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3670276A (en) * | 1971-02-11 | 1972-06-13 | Ltv Ling Altec Inc | Hermetic transformer |
US3708774A (en) * | 1970-10-31 | 1973-01-02 | Tokyo Shibaura Electric Co | Potential transformer having a bar-shaped magnetic core |
US3766505A (en) * | 1970-08-27 | 1973-10-16 | Matsushita Electric Ind Co Ltd | Flyback transformer device |
US3838372A (en) * | 1971-10-29 | 1974-09-24 | Motorola Inc | Magnetic pickup assembly |
US4012672A (en) * | 1975-03-28 | 1977-03-15 | Motorola, Inc. | Plug-in module for electronic device having component forming a guide for aligning the module |
US4132969A (en) * | 1976-06-08 | 1979-01-02 | Lucas Industries Limited | Ignition coils |
US4228415A (en) * | 1978-07-26 | 1980-10-14 | Schantz Spencer C | Compact solenoid with pin terminals |
DE3048803A1 (en) * | 1979-12-26 | 1981-10-01 | Nippondenso Co., Ltd., Kariya, Aichi | IC engine ignition coil - has core with sleeve for primary winding and former for secondary winding all enclosed by resin mass |
US4352079A (en) * | 1981-07-24 | 1982-09-28 | Honeywell Inc. | High voltage ignition transformer |
DE3113743A1 (en) * | 1981-04-04 | 1982-10-21 | Robert Bosch Gmbh, 7000 Stuttgart | Ignition coil, especially a bar ignition coil, for Otto-cycle engines |
US4356344A (en) * | 1981-01-26 | 1982-10-26 | Chloride Electro Networks, Division Of Chloride, Inc., N. American Operation | Metal-plastic header assembly |
US4404534A (en) * | 1980-10-14 | 1983-09-13 | General Signal Corporation | Electromagnetic assembly |
US4677408A (en) * | 1986-07-28 | 1987-06-30 | G. General Electro-Components, Inc. | Solenoid coil connection |
US5710534A (en) * | 1995-04-25 | 1998-01-20 | Abb Power T&D Company Inc. | Electrical apparatus including electric field control means |
US6163949A (en) * | 1996-06-05 | 2000-12-26 | L.H. Carbide Corporation | Method for manufacturing long, slender lamina stack from nonuniform laminae |
US6195875B1 (en) | 1996-06-05 | 2001-03-06 | L.H. Carbide Corporation | Apparatus for manufacturing long, slender lamina stacks from nonuniform laminae |
US6636137B1 (en) | 1996-06-05 | 2003-10-21 | L.H. Carbide Corporation | Ignition coil assembly |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2630782B1 (en) * | 1988-04-28 | 1993-05-14 | Marchal Equip Auto | IGNITION COIL FOR IGNITION OF INTERNAL COMBUSTION ENGINES OF MOTOR VEHICLES, AND MANUFACTURING METHOD THEREOF |
DE3902218A1 (en) * | 1989-01-26 | 1990-08-02 | Wabco Westinghouse Fahrzeug | DEVICE FOR FIXING THE POSITION OF A REEL CARRIER IN A POT SHAPED HOUSING PART |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2701865A (en) * | 1952-05-31 | 1955-02-08 | Essex Wire Corp | Ignition coil |
-
1969
- 1969-08-08 US US848451A patent/US3546647A/en not_active Expired - Lifetime
-
1970
- 1970-07-08 GB GB3312570A patent/GB1312847A/en not_active Expired
- 1970-08-05 FR FR707028857A patent/FR2057059B3/fr not_active Expired
-
1976
- 1976-01-05 JP JP1976000089U patent/JPS5150976Y1/ja not_active Expired
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2701865A (en) * | 1952-05-31 | 1955-02-08 | Essex Wire Corp | Ignition coil |
Cited By (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3766505A (en) * | 1970-08-27 | 1973-10-16 | Matsushita Electric Ind Co Ltd | Flyback transformer device |
US3708774A (en) * | 1970-10-31 | 1973-01-02 | Tokyo Shibaura Electric Co | Potential transformer having a bar-shaped magnetic core |
US3670276A (en) * | 1971-02-11 | 1972-06-13 | Ltv Ling Altec Inc | Hermetic transformer |
US3838372A (en) * | 1971-10-29 | 1974-09-24 | Motorola Inc | Magnetic pickup assembly |
US4012672A (en) * | 1975-03-28 | 1977-03-15 | Motorola, Inc. | Plug-in module for electronic device having component forming a guide for aligning the module |
US4132969A (en) * | 1976-06-08 | 1979-01-02 | Lucas Industries Limited | Ignition coils |
US4228415A (en) * | 1978-07-26 | 1980-10-14 | Schantz Spencer C | Compact solenoid with pin terminals |
DE3048803A1 (en) * | 1979-12-26 | 1981-10-01 | Nippondenso Co., Ltd., Kariya, Aichi | IC engine ignition coil - has core with sleeve for primary winding and former for secondary winding all enclosed by resin mass |
US4404534A (en) * | 1980-10-14 | 1983-09-13 | General Signal Corporation | Electromagnetic assembly |
US4356344A (en) * | 1981-01-26 | 1982-10-26 | Chloride Electro Networks, Division Of Chloride, Inc., N. American Operation | Metal-plastic header assembly |
DE3113743A1 (en) * | 1981-04-04 | 1982-10-21 | Robert Bosch Gmbh, 7000 Stuttgart | Ignition coil, especially a bar ignition coil, for Otto-cycle engines |
US4352079A (en) * | 1981-07-24 | 1982-09-28 | Honeywell Inc. | High voltage ignition transformer |
US4677408A (en) * | 1986-07-28 | 1987-06-30 | G. General Electro-Components, Inc. | Solenoid coil connection |
US5710534A (en) * | 1995-04-25 | 1998-01-20 | Abb Power T&D Company Inc. | Electrical apparatus including electric field control means |
US6163949A (en) * | 1996-06-05 | 2000-12-26 | L.H. Carbide Corporation | Method for manufacturing long, slender lamina stack from nonuniform laminae |
US6195875B1 (en) | 1996-06-05 | 2001-03-06 | L.H. Carbide Corporation | Apparatus for manufacturing long, slender lamina stacks from nonuniform laminae |
US6636137B1 (en) | 1996-06-05 | 2003-10-21 | L.H. Carbide Corporation | Ignition coil assembly |
US6745458B2 (en) | 1996-06-05 | 2004-06-08 | L.H. Carbide Corporation | Laminated magnetic core and method for making |
Also Published As
Publication number | Publication date |
---|---|
JPS5150976Y1 (en) | 1976-12-07 |
FR2057059A7 (en) | 1971-05-07 |
FR2057059B3 (en) | 1973-04-27 |
GB1312847A (en) | 1973-04-11 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: ELTRA CORPORATION, OHIO Free format text: CERTIFIED COPY OF MERGER FILED IN THE OFFICE OF SECRETARY OF STATE OF DELAWARE ON JUNE 6, 1980, SHOWING MERGER AND CHANGE OF NAME OF ASSIGNOR;ASSIGNOR:ATREL CORPORATION;REEL/FRAME:003992/0237 Effective date: 19811020 Owner name: ELTRA CORPORATION, A CORP. OF NY Free format text: CERTIFIED COPY OF MERGER FILED IN THE OFFICE OF SECRETARY OF STATE OF DELAWARE ON JUNE 6, 1980, SHOWING MERGER AND CHANGE OF NAME OF ASSIGNOR;ASSIGNOR:ATREL CORPORATION (INTO);REEL/FRAME:003992/0237 Effective date: 19811020 |
|
AS | Assignment |
Owner name: ALLIED CORPORATION, NEW JERSEY Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:ELTRA CORPORATION;REEL/FRAME:004026/0293 Effective date: 19820531 Owner name: ALLIED CORPORATION; COLUMBIA RD. AND PARK AVE., MO Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:ELTRA CORPORATION;REEL/FRAME:004026/0293 Effective date: 19820531 |
|
AS | Assignment |
Owner name: CITICORP INDUSTRIAL CREDIT, INC., ILLINOIS Free format text: SECURITY INTEREST;ASSIGNOR:PRESTOLITE ELECTRIC INCORPORATED;REEL/FRAME:004568/0105 Effective date: 19860422 Owner name: CITICORP INDUSTRIAL CREDIT, INC., 200 SOUTH WACKER Free format text: SECURITY INTEREST;ASSIGNOR:PRESTOLITE ELECTRIC INCORPORATED;REEL/FRAME:004568/0105 Effective date: 19860422 |
|
AS | Assignment |
Owner name: PRESTOLITE ELECTRIC INCORPORATED, OHIO Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:ALLIED CORPORATION;REEL/FRAME:005869/0230 Effective date: 19860422 Owner name: PRESTOLITE ELECTRIC INCORPORATED, A CORP. OF DE Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:ALLIED CORPORATION, A CORP. OF NY;REEL/FRAME:005869/0230 Effective date: 19860422 |
|
AS | Assignment |
Owner name: PRESTOLITE ELECTRIC INCORPORATED, OHIO Free format text: RELEASE BY SECURED PARTY OF SECURITY AGREEMENTS RECORDED ON REEL 4568 FRAME 0105 AND REEL 4626 FRAME 0084-0095;ASSIGNOR:CITICORP NORTH AMERICA, INC., FORMERLY CITICORP INDUSTRIAL CREDIT, INC.;REEL/FRAME:005967/0610 Effective date: 19911025 Owner name: PRESTOLITE ELECTRIC INCORPORATED Free format text: RELEASE BY SECURED PARTY OF SECURITY AGREEMENTS RECORDED ON REEL 4568 FRAME 0105 AND REEL 4626 FRAME 0084-0095;ASSIGNOR:CITICORP NORTH AMERICA, INC., FORMERLY CITICORP INDUSTRIAL CREDIT, INC.;REEL/FRAME:005967/0610 Effective date: 19911025 Owner name: PEI 1991 ACQUISITION, INC., OHIO Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:PRESTOLITE ELECTRIC INCORPORATED;REEL/FRAME:005967/0628 Effective date: 19911029 Owner name: PEI 1991 ACQUISITION, INC. Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:PRESTOLITE ELECTRIC INCORPORATED;REEL/FRAME:005967/0628 Effective date: 19911029 |