US3879174A
Expired / Lapsed
US
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Method and apparatus for forming metallized film capacitors
Assignee: Illinois Tool Works Inc
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Filing: 1974-07-17
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Granted: 1975-04-22
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Expires: 1994-07-17
Abstract
Abstract The embodiment of the invention disclosed herein is directed to a method and apparatus for forming metallized film capacitors. A pair of conductive lead wires are positioned in spaced-apart parallel relation to one another and a film having metallized conductive surfaces formed on both sides thereof is positioned between the conductive lead wires. Metallic foil strips are positioned between the respective metallized surfaces and their associated conductive lead wire to provide electrical contact between the metallized surfaces and their respective conductive lead wire. The electrical lead wires are rotated about an axis located between the lead wires to wrap the metallized film and metallic foils thereabout. To insure insulation between the opposite conductive surfaces of the metallized film, a layer of dielectric film is inserted on one side thereof. A removable mandrel is inserted adjacent the conductive lead wires to hold the free end of the dielectric film in position during the initial winding operation. One end of each side of the doublesided metallized film is provided with an unmetallized margin and the ends of the capacitor are sprayed with a conductive film when the capacitor is formed to reduce the resistance of the unit.
Inventors
- 👤 John Phillip Uhl
- 👤 Ki Hong Kim
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 12:24
CPC Classifications
H; H01; H01G; H01G13/00; H01G13/02; Y; Y10; Y10T; Y10T29/00; Y10T29/43; Y10T29/435
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
177 words
APPARATUS FOR FORMING A METALLIZED FILM CAPACITOR, COMPIRISING: FIRST SNAND SECOND WIRE POSITIONING AND ROTATING MEANS FOR PLACING A PAIR OF CONDUCTIVE LEAD WIRES IN PARALLEL SPACED RELATION TO ONE ANOTHER, METALLIZED FILM SUPPORT MEANS TO DELIVER ONE END OF A LENGTH OF METALLIZED FILM BETWEEN SAID PAIR OF CONDUCTIVE LEAD WIRES, METAL FOIL TRANSPORT MEANS TO POSITION A PAIR OF METALLIC FOILS OF PREDETERMINED LENGTHS ON OPPOSITE SIDES, OF THE METALLIZED FILM NEAR SAID ONE END THEREOF TO MAKE ELECTRICAL CONTACT BETWEEN THE METALLIZED FILM AND THE RESPECTIVE PAIR OF CONDUCTIVE LEAD WIRES, DIELECTRIC TRANSPORT MEANS TO PLACE ONE END OF A LENGTH OF DIELECTRIC MATERIAL OVER SAID ONE END OF SAID METALLIZED FILMAND ONE OF SAID PREDETERMINED LENGTHS OF METALLIC FOIL, AND DRIVE MEANS FOR ROTATING SAID PAIR OF CONDUCTIVE LEAD WIRES ABOUT AN AXIS THEREBETWEEN TO WRAP SAID METALLIZED FILM, SAID PREDETERMINED LENGTHS OF METALLIC FOIL AND SAID DIELECTRIC MATERIAL, WHEREBY A METALLIZED FOIL WOUND CAPACITOR OF A GIVEN VALUE IS FORMED BY A PREDETERMINED NUMBER OF REVOLUTIONS OF SAID PAIR OF LEAD WIRES.
Claim 2
Dependent Claim
177 words
APPARATUS FOR FORMING A METALLIZED FILM CAPACITOR, COMPIRISING: FIRST SNAND SECOND WIRE POSITIONING AND ROTATING MEANS FOR PLACING A PAIR OF CONDUCTIVE LEAD WIRES IN PARALLEL SPACED RELATION TO ONE ANOTHER, METALLIZED FILM SUPPORT MEANS TO DELIVER ONE END OF A LENGTH OF METALLIZED FILM BETWEEN SAID PAIR OF CONDUCTIVE LEAD WIRES, METAL FOIL TRANSPORT MEANS TO POSITION A PAIR OF METALLIC FOILS OF PREDETERMINED LENGTHS ON OPPOSITE SIDES, OF THE METALLIZED FILM NEAR SAID ONE END THEREOF TO MAKE ELECTRICAL CONTACT BETWEEN THE METALLIZED FILM AND THE RESPECTIVE PAIR OF CONDUCTIVE LEAD WIRES, DIELECTRIC TRANSPORT MEANS TO PLACE ONE END OF A LENGTH OF DIELECTRIC MATERIAL OVER SAID ONE END OF SAID METALLIZED FILMAND ONE OF SAID PREDETERMINED LENGTHS OF METALLIC FOIL, AND DRIVE MEANS FOR ROTATING SAID PAIR OF CONDUCTIVE LEAD WIRES ABOUT AN AXIS THEREBETWEEN TO WRAP SAID METALLIZED FILM, SAID PREDETERMINED LENGTHS OF METALLIC FOIL AND SAID DIELECTRIC MATERIAL, WHEREBY A METALLIZED FOIL WOUND CAPACITOR OF A GIVEN VALUE IS FORMED BY A PREDETERMINED NUMBER OF REVOLUTIONS OF SAID PAIR OF LEAD WIRES.
Claim 3
Dependent Claim
178 words
Apparatus for forming a metallized film capacitor, comprising: first and second wire positioning and rotating means for placing a pair of conductive lead wires in parallel spaced relation to one another, metallized film support means to deliver one end of a length of metallized film between said pair of conductive lead wires, metal foil transport means to position a pair of metallic foils of predetermined lengths on opposite sides of the metallized film near said one end thereof to make electrical contact between the metallized film and the respective pair of conductive lead wires, dielectric transport means to place one end of a length of dielectric material over said one end of said metallized film and one of said predetermined lengths of metallic foil, and drive means for rotating said pair of conductive lead wires about an axis therebetween to wrap said metallized film, said predetermined lengths of metallic foil and said dielectric material, whereby a metallized foil wound capacitor of a given value is formed by a predetermined number of revolutions of said pair of lead wires.
Claim 4
Dependent Claim
178 words
Apparatus for forming a metallized film capacitor, comprising: first and second wire positioning and rotating means for placing a pair of conductive lead wires in parallel spaced relation to one another, metallized film support means to deliver one end of a length of metallized film between said pair of conductive lead wires, metal foil transport means to position a pair of metallic foils of predetermined lengths on opposite sides of the metallized film near said one end thereof to make electrical contact between the metallized film and the respective pair of conductive lead wires, dielectric transport means to place one end of a length of dielectric material over said one end of said metallized film and one of said predetermined lengths of metallic foil, and drive means for rotating said pair of conductive lead wires about an axis therebetween to wrap said metallized film, said predetermined lengths of metallic foil and said dielectric material, whereby a metallized foil wound capacitor of a given value is formed by a predetermined number of revolutions of said pair of lead wires.
Claim 5
Dependent Claim
39 words
The apparatus as set forth in claim 1 further including means to form an initial partial wrap of said pair of metallic foils about their respective conductive lead wires prior to rotating the lead wires by said drive means.
Claim 6
Dependent Claim
70 words
The apparatus as set forth in claim 1 wherein each of said pair of metal foils is cut from a separate continuous length of metal foil material wrapped about a spool, and further including holding means for engaging the free end of said length of metal foil in position adjacent the Respective conductive lead wire and cutting means for cutting said continuous lengths of metal foil into said predetermined lengths.
Claim 7
Dependent Claim
54 words
The apparatus as set forth in claim 1 further including mandrel means positioned adjacent to and parallel with the conductive lead wires to hold said end of the dielectric film in place during initial rotation of said conductive lead wires, said mandrel means being removable from its position after the wound capacitor is formed.
Claim 8
Dependent Claim
47 words
The apparatus as set forth in claim 1 further including heat seal means positioned adjacent the wound capacitor for heating at least one turn of dielectric material over the terminating end of said metallized film to provide a heat seal between two adjacent layers of dielectric material.
Claim 9
Dependent Claim
81 words
The apparatus as set forth in claim 1 including first spool support means for receiving a roll of metallized film, second spool support means for receiving a first roll of metal foil, third spool support means for receiving a second roll of metal foil, and fourth spool support means for receiving a roll of dielectric film, and means for transporting said metallized film, said first and second rolls of metal foil, and said roll of dielectric film from their respective rolls.
Claim 10
Dependent Claim
36 words
The apparatus as set forth in claim 6 further including guide roller means associated with each of the transport means for said metallized film, said first and second rolls of metal foil and said dielectric film.
Claim 11
Independent Claim
183 words
A method of forming metallized film capacitors comprising the steps of: positioning a pair of conductive lead wires in parallel spaced apart relation to one another, placing one end of a length of metallized film having first and second conductive layers between said pair of spaced apart conductive lead wires, placing metal foil strips on each side of said metallized film between the respective conductive lead wires to provide electrical contact between the conductive lead wires and said respective conductive layers, placing the end of a length of dielectric film adjacent the metallized film to overlie one of said metal foils, rotating said conductive lead wires about an axis located between the axes of the lead wires to wrap the metallized film and the metal foils and the dielectric material thereabout to form a wound capacitor structure, and spraying a conductive film onto the ends of said wound capacitor so as to interconnect the edges of said first conductive foil at one end of said wound capacitor and the edges of said second conductive foil at the other end of said wound capacitor.
Claim 12
Independent Claim
183 words
A method of forming metallized film capacitors comprising the steps of: positioning a pair of conductive lead wires in parallel spaced apart relation to one another, placing one end of a length of metallized film having first and second conductive layers between said pair of spaced apart conductive lead wires, placing metal foil strips on each side of said metallized film between the respective conductive lead wires to provide electrical contact between the conductive lead wires and said respective conductive layers, placing the end of a length of dielectric film adjacent the metallized film to overlie one of said metal foils, rotating said conductive lead wires about an axis located between the axes of the lead wires to wrap the metallized film and the metal foils and the dielectric material thereabout to form a wound capacitor structure, and spraying a conductive film onto the ends of said wound capacitor so as to interconnect the edges of said first conductive foil at one end of said wound capacitor and the edges of said second conductive foil at the other end of said wound capacitor.
Claim 13
Dependent Claim
58 words
The method of forming a metallized film capacitor as set forth in claim 8 further including the step of inserting a removable mandrel between said spaced apart conductive lead wires to hold said dielectric material in position during initial rotation of said lead wires, and removing said mandrel at a time after the metallized capacitor is being wound.
Claim 14
Dependent Claim
45 words
The method of forming a metallized film capacitor as set forth in claim 8 further including the step of cutting said metallized film and said dielectric film into predetermined lengths after being wound about said conductive lead wires to form a capacitor of predetermined value.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-04-21 | 1978-10-21 | 1979-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-21 | 1982-10-21 | 1983-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-21 | 1986-10-21 | 1987-04-22 | $7700.00 | Window Closed / Lapsed |