US3432923A - Method of manufacturing fuse elements from strip material for cartridge fuse links - Google Patents

Method of manufacturing fuse elements from strip material for cartridge fuse links Download PDF

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Publication number
US3432923A
US3432923A US550447A US3432923DA US3432923A US 3432923 A US3432923 A US 3432923A US 550447 A US550447 A US 550447A US 3432923D A US3432923D A US 3432923DA US 3432923 A US3432923 A US 3432923A
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United States
Prior art keywords
strip
fuse
width
thickness
strip material
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Expired - Lifetime
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US550447A
Inventor
John Feenan
Eric Jacks
John Eric Murphy
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English Electric Co Ltd
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English Electric Co Ltd
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Publication date
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Publication of US3432923A publication Critical patent/US3432923A/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H85/00—Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive
    • H01H85/02—Details
    • H01H85/04—Fuses, i.e. expendable parts of the protective device, e.g. cartridges
    • H01H85/05—Component parts thereof
    • H01H85/055—Fusible members
    • H01H85/08—Fusible members characterised by the shape or form of the fusible member
    • H01H85/10—Fusible members characterised by the shape or form of the fusible member with constriction for localised fusing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H69/00—Apparatus or processes for the manufacture of emergency protective devices
    • H01H69/02—Manufacture of fuses
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/49107—Fuse making

Definitions

  • This invention relates to a method of forming a fuse element from strip material by initially rolling in the strip a plurality of grooves spaced apart along its length and subsequently forming notches on opposite sides of the strip along the length of each groove, whereby the thickness and width of each neck portion thus produced are less than the thickness and width of the remaining portions of the strip adjacent thereto.
  • the invention relates to electrical fuse-elements and is particularly applicable to fuse-elements for use in cartridge fuse links of the type in which a fuse-element is supported within a tubular insulating container by two conductive members secured to the container one at each end thereof.
  • a method of producing a fuse element from a strip of fusible metal comprising the steps of initially forming a groove across the width of the strip and subsequently forming notches on opposite sides of the strip along the length of the groove, whereby the thickness and width of the neck portion so formed are less than the thickness and width of the remaining portion of the strip.
  • FIG. 1 is a perspective view of the fuse-element
  • FIG. 2 is a fragmentary view, to an enlarged scale, of part of the fuse-element.
  • the fuse-element comprises a strip 10 of silver which is provided with a series of neck portions 11 joining fullsection portions such as those indicated at 12.
  • the neck portions 11 are disposed centrally relative to the width of the strip 10 and have a thickness x (FIG. 2) which is less than the thickness v of the full-section portions 12.
  • the cross-sectional area of each neck portion 11 in the plane perpendicular to the length of the strip 10 is approximately the cross-sectional area of each fullsection portion 12.
  • the fuse-element includes a thickened portion 13 for reducing the overall resistance of the fuse. Such a portion may be positioned at either or both ends of the element and/ or in the middle of the element.
  • the appropriate strip of material is fed between two closely spaced contrarotating rollers, one having a plane surface and the other having a male contour conforming to the grooves to be formed in the strip, the clear spacing between the rollers thus defining the thickness of the neck portion slots are then formed, extending inwardly from the ends of the groove so as to define the lateral width of the neck por- 3,432,923 Patented Mar. 18, 1969 tion.
  • the grooves can be formed by milling with a cutter.
  • the desired ratio of cross-sectional areas between the full-section portions and the neck portion cannot in many cases be obtained in this way without so reducing the thickness of the strip at the groove as to make the strip unmanageable mechanically. Therefore, by providing, in a fuse-element according to the invention, a neck-portion having both a reduced width and a reduced thickness, a compromise can be made between the conflicting requirements of mechanical strength and good current distribution and at the same time the desired ratio of cross-sectional areas can be achieved.
  • a first fuse-element three inches long was provided, with a series of six neck portions by simply forming slots in the sides of the strip so that the lateral width of the strip was reduced to of the full width.
  • the measured resistance was 750 microhms.
  • a second fuse-element of the same length had the thickness of the neck portions reduced from .010 inch i.e. about 1:3, to 0.003 inches enabling the width of the neck portions to be 3 /3 times wider than in the first fuseelement for the same cross-sectional area.
  • the measured resistance of the second element was 600 microhms.
  • the required cross-sectional area of the neck portion should be spread over as much of the width of the strip as possible commensurate with good mechanical strength: this also provides the most effective heat dissipation because, for a given cross-section, the largest possible surface area is available for heat transfer pur poses.
  • a method of producing a fuse element from a strip of fusible metal substantially rectangular in cross-section comprising the steps of initially forming across the width of the strip a plurality of grooves spaced apart along the length of the strip so that the thickness of the strip in the grooves is reduced to about one-third, and
  • a method of producing a fuse element from a strip of fusible metal substantially rectangular in crosssection comprising the steps of initially forming a plurality of grooves extending across the width of the strip by a rolling operation, the grooves being spaced apart along the length of the strip so that the thickness of the strip in the grooves is reduced to about one-third, and

Description

March 18, 1969 .1 FEENAN ET AL METHOD OF MANUFACTURING FUSE ELEMENTS FROM STRIP MATERIAL FOR CARTRIDGE FUSE LINKS Original Filed Jan. 30, 1964 APPLICANTS John Feenan, Eric Jacks and John Eric Murphy BY Misegades 80 Douglas ATTORNEYS United States Patent Office 5,145 63 US. Cl. 29-623 2 Claims Int. Cl. H01h 6'9/02 ABSTRACT OF THE DISCLOSURE This invention relates to a method of forming a fuse element from strip material by initially rolling in the strip a plurality of grooves spaced apart along its length and subsequently forming notches on opposite sides of the strip along the length of each groove, whereby the thickness and width of each neck portion thus produced are less than the thickness and width of the remaining portions of the strip adjacent thereto.
This application is a division of our co-pending application Ser. No. 341,267 filed on Jan. 30, 1964, now Patent No. 3,288,968.
The invention relates to electrical fuse-elements and is particularly applicable to fuse-elements for use in cartridge fuse links of the type in which a fuse-element is supported within a tubular insulating container by two conductive members secured to the container one at each end thereof.
According to the invention, there is provided a method of producing a fuse element from a strip of fusible metal, comprising the steps of initially forming a groove across the width of the strip and subsequently forming notches on opposite sides of the strip along the length of the groove, whereby the thickness and width of the neck portion so formed are less than the thickness and width of the remaining portion of the strip.
A preferred form of fuse-element made by a method according to this invention will now be described with reference to the accompanying drawings in which:
FIG. 1 is a perspective view of the fuse-element; and
FIG. 2 is a fragmentary view, to an enlarged scale, of part of the fuse-element.
The fuse-element comprises a strip 10 of silver which is provided with a series of neck portions 11 joining fullsection portions such as those indicated at 12. The neck portions 11 are disposed centrally relative to the width of the strip 10 and have a thickness x (FIG. 2) which is less than the thickness v of the full-section portions 12. The cross-sectional area of each neck portion 11 in the plane perpendicular to the length of the strip 10 is approximately the cross-sectional area of each fullsection portion 12.
The fuse-element includes a thickened portion 13 for reducing the overall resistance of the fuse. Such a portion may be positioned at either or both ends of the element and/ or in the middle of the element.
In producing this fuse element, the appropriate strip of material is fed between two closely spaced contrarotating rollers, one having a plane surface and the other having a male contour conforming to the grooves to be formed in the strip, the clear spacing between the rollers thus defining the thickness of the neck portion slots are then formed, extending inwardly from the ends of the groove so as to define the lateral width of the neck por- 3,432,923 Patented Mar. 18, 1969 tion. Alternatively, the grooves can be formed by milling with a cutter.
It has been found that a ratio between the cross-sectional areas of the full-section portions and the neck portion of the order of 10:1 (that is, ranging from about 8:1 to about 12:1), as in this case, is an important factor in producing a fuse with a high current rating within limited dimensions and with a fast fusing action. It has also been found that the proportions of the neck portion affect the distribution of current in the full-section portions and hence the overall effective resistance of the fuse element which should be as low as possible. The best current distribution in the full-section portions (and hence the lowest overall effective resistance) is obtained by reducing the thickness, rather than the width, of the neck portion: ideally, the neck portion would consist of a groove extending across the whole width of the strip. However, the desired ratio of cross-sectional areas between the full-section portions and the neck portion cannot in many cases be obtained in this way without so reducing the thickness of the strip at the groove as to make the strip unmanageable mechanically. Therefore, by providing, in a fuse-element according to the invention, a neck-portion having both a reduced width and a reduced thickness, a compromise can be made between the conflicting requirements of mechanical strength and good current distribution and at the same time the desired ratio of cross-sectional areas can be achieved. In a test illustrating this, a first fuse-element, three inches long was provided, with a series of six neck portions by simply forming slots in the sides of the strip so that the lateral width of the strip was reduced to of the full width. The measured resistance was 750 microhms. A second fuse-element of the same length had the thickness of the neck portions reduced from .010 inch i.e. about 1:3, to 0.003 inches enabling the width of the neck portions to be 3 /3 times wider than in the first fuseelement for the same cross-sectional area. The measured resistance of the second element was 600 microhms.
Desirably, the required cross-sectional area of the neck portion should be spread over as much of the width of the strip as possible commensurate with good mechanical strength: this also provides the most effective heat dissipation because, for a given cross-section, the largest possible surface area is available for heat transfer pur poses.
What we claim as our invention and desire to secure by Letters Patent is:
1. A method of producing a fuse element from a strip of fusible metal substantially rectangular in cross-section, comprising the steps of initially forming across the width of the strip a plurality of grooves spaced apart along the length of the strip so that the thickness of the strip in the grooves is reduced to about one-third, and
subsequently forming notches of equal length on opposite sides of the strip along the length of each groove, whereby both the thickness and the width of each neck portion thus produced are less than the thickness and width of the remaining portions of the strip.
2. A method of producing a fuse element from a strip of fusible metal substantially rectangular in crosssection, comprising the steps of initially forming a plurality of grooves extending across the width of the strip by a rolling operation, the grooves being spaced apart along the length of the strip so that the thickness of the strip in the grooves is reduced to about one-third, and
subsequently forming notches of equal length on 0pposite sides of the strip along the length of each 1,973,120 9/1934 Steinmayer -1 200135 2,157,906 5/1939 Lohausen 200-135 X 2,157,907 5/ 1939 Lohausen.
Alberla et a1. 200135 X Horrer 72-203 Cremer 200135 X Lear 200135 5 JOHN F. CAMPBELL, Primary Examiner.
J. L. CLINE, Assistant Examiner.
US. Cl. X.R.
US550447A 1963-02-08 1966-05-16 Method of manufacturing fuse elements from strip material for cartridge fuse links Expired - Lifetime US3432923A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB5145/63A GB1059022A (en) 1963-02-08 1963-02-08 Improvements in and relating to electrical fuse-elements

Publications (1)

Publication Number Publication Date
US3432923A true US3432923A (en) 1969-03-18

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Family Applications (2)

Application Number Title Priority Date Filing Date
US341267A Expired - Lifetime US3288968A (en) 1963-02-08 1964-01-30 Electrical fusible element having three portions of different cross-sections
US550447A Expired - Lifetime US3432923A (en) 1963-02-08 1966-05-16 Method of manufacturing fuse elements from strip material for cartridge fuse links

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US341267A Expired - Lifetime US3288968A (en) 1963-02-08 1964-01-30 Electrical fusible element having three portions of different cross-sections

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US (2) US3288968A (en)
ES (1) ES296200A1 (en)
GB (1) GB1059022A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4337570A (en) * 1979-12-03 1982-07-06 Kenneth E. Beswick Limited Electrical fuselinks
US5668522A (en) * 1993-10-28 1997-09-16 Yazaki Corporation Slowly-breaking fuse and method of production
US8258913B2 (en) * 2006-08-28 2012-09-04 Yazaki Corporation Fuse element and method of manufacturing the same

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DK124506B (en) * 1969-01-06 1972-10-23 Knudsen Nordisk Elect Sand-filled electric fuse.
US3883838A (en) * 1974-04-01 1975-05-13 Gen Electric High-current current-limiting fuse
US5229739A (en) * 1992-02-21 1993-07-20 Littelfuse, Inc. Automotive high current fuse
US5668521A (en) * 1995-03-22 1997-09-16 Littelfuse, Inc. Three piece female blade fuse assembly having fuse link terminal with a clip receiving portion
US5581225A (en) * 1995-04-20 1996-12-03 Littelfuse, Inc. One-piece female blade fuse with housing
DE19616993A1 (en) * 1996-04-27 1997-10-30 Dynamit Nobel Ag Pyrotechnic fuse element for circuits
US5929740A (en) * 1997-10-20 1999-07-27 Littelfuse, Inc. One-piece female blade fuse with housing and improvements thereof
US5886612A (en) * 1997-10-20 1999-03-23 Littelfuse, Inc. Female fuse housing
SI21154A (en) * 2002-02-28 2003-08-31 Eti Elektroelement D.D. Fast fuse fusing element for protecting installations at low leaking current
US8339235B2 (en) * 2008-08-06 2012-12-25 Beckert James J Housing securing apparatus for electrical components, especially fuses
JP2014519153A (en) * 2012-01-03 2014-08-07 エルジー・ケム・リミテッド Battery pack and connecting bar applied to it
US20230170174A1 (en) * 2021-11-30 2023-06-01 Eaton Intelligent Power Limited Ceramic printed fuse fabrication

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1973120A (en) * 1931-06-01 1934-09-11 Line Material Co Fuse link
US2157906A (en) * 1935-06-24 1939-05-09 Gen Electric Electric fuse
US2157907A (en) * 1934-12-11 1939-05-09 Gen Electric Fuse
US2166033A (en) * 1936-12-28 1939-07-11 Arnold E Alberga Electric fuse and method of assembling same
US2346489A (en) * 1941-05-08 1944-04-11 Chicago Flexible Shaft Co Method of making comb members for dry shavers
US2561464A (en) * 1945-10-05 1951-07-24 Forges Ateliers Const Electr Time lag fuse
US2810043A (en) * 1953-10-06 1957-10-15 Monarch Electric Corp Delay action fuse link and method of making

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Publication number Priority date Publication date Assignee Title
US1124133A (en) * 1913-01-25 1915-01-05 N W Equipment Co Inc Safety-fuse for electric circuits.
US1426827A (en) * 1918-03-07 1922-08-22 Alfred L Eustice Method of making fuse links
US2471176A (en) * 1947-10-28 1949-05-24 Gen Electric Time lag fuse link
US2665348A (en) * 1950-05-16 1954-01-05 Chase Shawmut Co Current-limiting fuse
US2780696A (en) * 1953-10-06 1957-02-05 Monarch Electric Corp Composite fuse link
US2777033A (en) * 1954-06-14 1957-01-08 Chase Shawmut Co Power fuses with tubular links and pressure-type link connections

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1973120A (en) * 1931-06-01 1934-09-11 Line Material Co Fuse link
US2157907A (en) * 1934-12-11 1939-05-09 Gen Electric Fuse
US2157906A (en) * 1935-06-24 1939-05-09 Gen Electric Electric fuse
US2166033A (en) * 1936-12-28 1939-07-11 Arnold E Alberga Electric fuse and method of assembling same
US2346489A (en) * 1941-05-08 1944-04-11 Chicago Flexible Shaft Co Method of making comb members for dry shavers
US2561464A (en) * 1945-10-05 1951-07-24 Forges Ateliers Const Electr Time lag fuse
US2810043A (en) * 1953-10-06 1957-10-15 Monarch Electric Corp Delay action fuse link and method of making

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4337570A (en) * 1979-12-03 1982-07-06 Kenneth E. Beswick Limited Electrical fuselinks
US5668522A (en) * 1993-10-28 1997-09-16 Yazaki Corporation Slowly-breaking fuse and method of production
US5752310A (en) * 1993-10-28 1998-05-19 Yazaki Corporation Method of making a slowly-breaking fuse
US8258913B2 (en) * 2006-08-28 2012-09-04 Yazaki Corporation Fuse element and method of manufacturing the same

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Publication number Publication date
ES296200A1 (en) 1964-04-01
GB1059022A (en) 1967-02-15
US3288968A (en) 1966-11-29

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