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US2639350A - Electric fuse - Google Patents

Electric fuse Download PDF

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Publication number
US2639350A
US2639350A US2639350DA US2639350A US 2639350 A US2639350 A US 2639350A US 2639350D A US2639350D A US 2639350DA US 2639350 A US2639350 A US 2639350A
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US
United States
Prior art keywords
casing
cap
fuse
tubular
spigot
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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English (en)
Priority date (The priority date 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 date listed.)
Publication date
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Publication of US2639350A publication Critical patent/US2639350A/en
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Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • H01H85/0013—Means for preventing damage, e.g. by ambient influences to the fuse
    • H01H85/0021—Means for preventing damage, e.g. by ambient influences to the fuse water or dustproof devices
    • H01H85/003—Means for preventing damage, e.g. by ambient influences to the fuse water or dustproof devices casings for the fusible element
    • 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
    • H01H85/041—Fuses, i.e. expendable parts of the protective device, e.g. cartridges characterised by the type
    • H01H85/044—General constructions or structure of low voltage fuses, i.e. below 1000 V, or of fuses where the applicable voltage is not specified
    • H01H85/045—General constructions or structure of low voltage fuses, i.e. below 1000 V, or of fuses where the applicable voltage is not specified cartridge type
    • H01H85/0458—General constructions or structure of low voltage fuses, i.e. below 1000 V, or of fuses where the applicable voltage is not specified cartridge type with ferrule type end contacts

Definitions

  • This invention relates to electric fuses and in particular, to 'fuses in which one or more fusible conductors is enclosed in a tubular casing of insulating material closed at one or both ends by sealing caps. i. such fuses are often known as cartridge fuses and liquid fuses, and the tubular casing may be made of material such as porcelain glass, synthetic resin and so forth.
  • the objects of the present invention are .to provide a form of cartridge fuse in which the ends are sealed by a simple and cheap process and are effectively rendered gas-tight, water-tig'ht r and oil-tight at the sealed joints and, if desired' to make provision for indicators of the condition 1 of the fuse'jand to support the insulating core within the ca'sing in a simple and reliable fashion,
  • the sealed joint between the end cap and the tubular body of such an enclosed fuse is formed by one or more sealing rings' of yieldable material at each end',
  • the end'caps may also be adapted to aflord'a support for'a hollow star core of insulating material when such is employed, and then the iusi'b'le -conductor is supported on the core and the casing cylindricalwall of the casing and a re-entrant central portion of the end cap.
  • the spigot supporting the star core may also serve the purpose of a housing for an indicator of the spring compressed plunger type or the explos-ive capsule type.
  • an indicator usually has ;a
  • the rod may be enclosed within the end cap which has a thin wall at its centre portion which may be pierced by the pin of the indicator rod and then retains the latter in its outer indicating position.
  • the star core may have the outwardly extending sleeve-shaped terminals at each end to which the fusible conductor is connected, and this terminal may engage over and make electrical connection with an inwardly projecting spigot on the respective end cap.
  • Figure 1 is a central axial section of a preferred form of the cartridge fuse
  • Figure 2 is a cross-section on the line II-II;
  • Flgure 3 is an elevation of the body of the fuse shown in Figure 1 at one end and asection of the end cap in process of being forced on to the tubular casing; e
  • Figure 4 is an axial section of a modified for of Construction
  • Figure 5 is an axial section of one end of yet another form
  • Figure 6 is an elevation of one form showing the end cap with a mounting bracket and terminal securing it; while Figures 7 and 8 are respectively axial sections of two further modified forms of fuses in accordance with the invention.
  • the tubular casing l consists of a cylindrical tube of glass moulded with two annular grooves 2 at either end, such grooves being of semi-circular section.
  • Each of these grooves houses a rubber ring 3 which stands up from the casing I before the end cap is put into position, as shown in Figure 3.
  • a sheet metal end cap 4 is pressed over the tubular casing to compress and deform the rings 3, as indicated in Figure 1, and in order to avoid damage to the rings 3 or to force them out of their grooves 2, each endcap 4 has its mouth flared somewhat at 5. In this way the rings 3 are spread and form a gas and liquid-tight joint at each end of the casing I.
  • each sealing ring is of sufficient Volume, when compressed, to fill completely the annular groove in which it is located and there is sufiicient additional material to fill a substantial part of the annular space between the cap and the casing.
  • inner cap 8 is also formed with a tubularspigot ID on which the star core 6 is supported.
  • For' hand terminal 25 pushed over the spigot 26.
  • tube casing I and the star core 6 are then filled withpowder as before and the inner cap 4 with the Washer 22 and the outer cap 24 at the right hand end pushed on.
  • a helix of silver wir" [2 bridging the ribs 1 is ,carriedon the outside of 'the 'core 5 :and is .spot welded at its-ende to the'inner caps 8 which are *conveniently-of coppenso thatthissilver conducr tor electrically connected between 'the end 'caps- 4."
  • the inner cap 'a-at the right ⁇ hand end also serves-*as 'the housing .for an indieator 1-3 *of 'the' explosive capsule' ⁇ type which .makes 'a slidingfit within-:the spigot w.
  • the indicator -plunger na has ⁇ a radialrod l.4-:-pressed outwards by a light spring :not shown, to uengage the' innerwall of :the spigot w so as tomake -electrical contact between the indicator plunger !3 and the spigot o of the cap .8-.
  • the indicator has' a forwardly pointed red" !5 en- -closed ⁇ withinrthe end cap d'which has thin wall 16 at its' central part which 'can be 'pierced bythe poi-nted ⁇ 'red i 5 when'the fuse is blown; and which thengrips the rod l5 'and retains it in the' in'- dicating position.
  • the Iindicator' ta is exploded by a subsidiaryfusible conductor consisting of a ccil of tungsten wire 11.2 This wire at' the'left "hand 'end is'secured 'to 'a Copper -bridge'piece' 18 weldedat its ends to the inner 'cap !0,and at its other ,end'the' tungsten wire l' 'is :connected to theinner end 'of' the indicator i' so :as to'explode the capsule in the latter when the tungsten -wir i 'I fuses.
  • the star core E has ribs 'I and at either end, has a sleeve-like terminal 25 cemented 'on to it as shown at 42 and the silver r fusible conductor !2 is spot welded to the terminals 25.
  • the terminals* 25 are 'arranged to fit over and make connection with the inturned
  • the 'assembly of the fuse is carried' 'out much to that indicator of the spring-pressed or explosive capsule type has its.
  • the indicator is n'ot shown in Figure 4.
  • the Construction is generally ⁇ as at the right hand end of Figure 1, the end-cap@ supporting'an inner cap 3 which enters a plug H forced into the bore of the star core 6-.
  • the ;spigot li) of the inner cap 8 forms the housing for indicator 13 which is'of the explosivecapsule type.
  • -Thisplunger is ormed 'with a numbertof thin .collars 30 ⁇ leaving grooves :between them which are intended-to be engaged by a pair of springy out-turned arms 39. which serve-as ⁇ retaining ⁇ pawls-'when fuse is blown and the-indicator ⁇ 13 is :forced ⁇ into its outer position.
  • the arms 39 extend-inwardly .from a :ring ;heldlbetween the flat surface of the inner cap e anda acking ring 40. otherwise ⁇ 'the Construction is as shown 'in Figure ,1.
  • Figure 6 shows one end of afuse acco'ding ,to , Figures 1 or 5, wherein the spade bracket 3,! also ,forming-'a terminal, is provided for mountinggthe fuse'and isspot-brazed to the flat end .oran outer ⁇ end cap i i i 'In Figura ⁇ '7- another .form' of ;Construction is shown in which the star core 5 is support-eclby sleeve terminals 25 extending cutwardly :from the star core ⁇ &and having their outer slit ende-*spring over the re-.entrant parts *25 of 'the end :caps .4 and Secured by circlips 41 ⁇ There is also at each endra packing Washer 23 betweenthe flat end of the 'casing i and the inner flat 'surface of the end cap 4.
  • the outer Caps 22 are, however,' omitted.
  • This fuse isshown 'for stud mounting by-means 'of a 'stud 32 secured in the re-entrant :part 26401? the .left .hand end :cap 4.
  • FIG. B a fuse according to the invention without a star core is shown; 'Generally speaking, the fuse is 'for stud 'mounting :as in Figure 7, and the end Caps 4 -are arranged similarly. 'There -are two fusible conductors 'in ⁇ parallel consisting of sections of heavy' gauge silver wire 33 with intermediate sections 34 'of .finer gauge 'and welded at 35 as in Figure '7.
  • An electrical fuse comprising in combination, a tubular casing of insulating material, a metallic terminal cap closing said casing at each end, said cap having a cylindrical portion telescoping a portion of said casing and providing an intervening annular space, one of said telescoping portions having an annular groove formed in its surface bounding said space, and a yieldable scaling ring compressed between the inner wall of each of said end caps and the outer wall of said casing and retained in said annular groove, and a fusible conductor enclosed in said casing and extending between said end caps, said sealing rings being engaged and deformed under compression by forcing said terminal caps over the body of said casing at both ends, each sealing ring being of sufficient Volume to fill completely the annuiar groove in which it is mounted and to fill a substantial part of said annular space.
  • An electrical fuse comprising in combination, a tubular casing of insulating material, a sheet metal terminal cap tightly fitting over said casing at each end, a hollow star core of insulating material mounted within said casing and supporting a fusible conductor, a tubular plug of yieldable material forced into the bore of said star core at either end and a sheet metal hollow spigot at each end of said casing secured to the respective terminal caps and fitting within said respective tubular plug.
  • An electrical fuse comprising in combination, 'a tubular casing of insulating material, a sheet metal terminal cap tightly fitting over said casing at each end, a hollow star core of insulating material mounted within said casing and supporting a fusible conductor, a tubular plug of yieldable material forced into the bore of said star core at either end, a sheet metal hollow spigot at each end of said casing secured to the respective terminal caps and fitting within said respective tubular plug and a fuse indicator with a slidable plunger and housed in said hollow spigot at one end of said casing.
  • An electrical fuse comprising in combinanation, a tubular casing of insulating material,
  • a sheet metal terminal cap tightly fitting over said casing -at each end, a hollow star core of insulating material mounted within said casing and supporting a fusible conductor, a tubular plug of yieldable material forced into the bore of said star core at either end, a sheet metal hollow spigot at each end of said casing secured to the respective terminal caps and fitting within said respective tubular plug and a fuse indicator with a slidable plunger and housed in said hollow spigot at one end of said casing, said terminal cap supporting said last-mentioned spigot being formed with a thin perforable wall at its central part adapted to be pierced by the plunger of said indicator on operation of the latter and to retain said plunger in the indicating position.
  • An electrical fuse comprising in combination, a tubular casing of insulating material, a sheet metal terminal cap tightly fitting over said casing at each end and ormed with an inwardly projecting tubular spigot, a hollow star core of insulating material mounted within said casing. a terminal sleeve secured to each end of said star core and projecting outwardly beyond the end of said star core to engage over and to be supported by said spigot of the respective terminal cap and to make electrical contact therewth and at least one fusible conductor supported on said star core and electrically connected at its ends to said respective terminal sleeve.

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  • Fuses (AREA)
US2639350D 1950-08-11 Electric fuse Expired - Lifetime US2639350A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB295510X 1950-08-11

Publications (1)

Publication Number Publication Date
US2639350A true US2639350A (en) 1953-05-19

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ID=10293310

Family Applications (1)

Application Number Title Priority Date Filing Date
US2639350D Expired - Lifetime US2639350A (en) 1950-08-11 Electric fuse

Country Status (5)

Country Link
US (1) US2639350A (de)
CH (1) CH295510A (de)
DE (1) DE936459C (de)
FR (1) FR1047970A (de)
GB (1) GB692627A (de)

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2761932A (en) * 1955-04-06 1956-09-04 Chase Shawmut Co Fuse structures with striker pins
US2794096A (en) * 1955-09-08 1957-05-28 Chase Shawmut Co High interrupting capacity currentlimiting fuses with striker pins
US2953665A (en) * 1958-01-03 1960-09-20 Electric Transmission Ltd Seals
US3012121A (en) * 1957-09-04 1961-12-05 Ite Circuit Breaker Ltd Electric fuses
US3270168A (en) * 1963-05-20 1966-08-30 English Electric Co Ltd High voltage fuse links having flexibly mounted fuse support
US3614699A (en) * 1970-08-10 1971-10-19 Mc Graw Edison Co Protector for electric circuits
US3962666A (en) * 1975-04-28 1976-06-08 The Chase-Shawmut Company Support plates for a helically wound fusible element
US4208787A (en) * 1976-12-30 1980-06-24 Westinghouse Electric Corp. Process for making a submersible fuse
US4322706A (en) * 1980-12-15 1982-03-30 Kearney-National, Inc. Piston actuated striker for electric fuse
US4323874A (en) * 1980-07-28 1982-04-06 Rte Corporation Blown fuse indicator
US4910490A (en) * 1989-06-28 1990-03-20 Gould, Inc. End terminal seal for an electric fuse
US5361058A (en) * 1993-11-02 1994-11-01 Gould Electronics Inc. Time delay fuse
US5367281A (en) * 1993-12-30 1994-11-22 Eaton Corporation Striker pin device for an electric fuse
US5892427A (en) * 1998-04-24 1999-04-06 Cooper Technologies Company Current limiting high voltage fuse
US20060119465A1 (en) * 2004-12-03 2006-06-08 Dietsch G T Fuse with expanding solder
US20060119464A1 (en) * 2004-12-06 2006-06-08 Muench Frank J Jr Current limiting fuse
US20070132539A1 (en) * 2005-06-02 2007-06-14 Wickmann-Werke Gmbh Fusible spiral conductor for a fuse component with a plastic seal
US20070236323A1 (en) * 2004-02-21 2007-10-11 Wickmann-Werke Gmbh Fusible Conductive Coil with an Insulating Intermediate Coil for Fuse Element
US20090021339A1 (en) * 2005-06-07 2009-01-22 Siba Fuses Gmbh & Co. Kg High-voltage fuse
US9117615B2 (en) 2010-05-17 2015-08-25 Littlefuse, Inc. Double wound fusible element and associated fuse

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4928981Y1 (de) * 1969-12-15 1974-08-07
US3723931A (en) * 1971-07-19 1973-03-27 Mc Graw Edison Co Protectors for electric circuits
FR2614468B1 (fr) * 1987-04-27 1989-06-09 Merlin Gerin Fusible electrique a haute tension rempli de sable
CN109616392A (zh) * 2018-12-27 2019-04-12 南京萨特科技发展有限公司 一种高分断小型熔断器及其制备方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2063967A (en) * 1935-03-22 1936-12-15 Benjamin B Whittam Compression joint
US2216661A (en) * 1936-09-29 1940-10-01 Dannenberg Kurt High tension fuse
US2249945A (en) * 1938-02-24 1941-07-22 Dannenberg Kurt High tension fuse
US2439674A (en) * 1944-10-17 1948-04-13 Gen Electric Current limiting fuse

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE220948C (de) *
DE267829C (de) *

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2063967A (en) * 1935-03-22 1936-12-15 Benjamin B Whittam Compression joint
US2216661A (en) * 1936-09-29 1940-10-01 Dannenberg Kurt High tension fuse
US2249945A (en) * 1938-02-24 1941-07-22 Dannenberg Kurt High tension fuse
US2439674A (en) * 1944-10-17 1948-04-13 Gen Electric Current limiting fuse

Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2761932A (en) * 1955-04-06 1956-09-04 Chase Shawmut Co Fuse structures with striker pins
US2794096A (en) * 1955-09-08 1957-05-28 Chase Shawmut Co High interrupting capacity currentlimiting fuses with striker pins
US3012121A (en) * 1957-09-04 1961-12-05 Ite Circuit Breaker Ltd Electric fuses
US2953665A (en) * 1958-01-03 1960-09-20 Electric Transmission Ltd Seals
US3270168A (en) * 1963-05-20 1966-08-30 English Electric Co Ltd High voltage fuse links having flexibly mounted fuse support
US3614699A (en) * 1970-08-10 1971-10-19 Mc Graw Edison Co Protector for electric circuits
US3962666A (en) * 1975-04-28 1976-06-08 The Chase-Shawmut Company Support plates for a helically wound fusible element
US4208787A (en) * 1976-12-30 1980-06-24 Westinghouse Electric Corp. Process for making a submersible fuse
US4323874A (en) * 1980-07-28 1982-04-06 Rte Corporation Blown fuse indicator
US4322706A (en) * 1980-12-15 1982-03-30 Kearney-National, Inc. Piston actuated striker for electric fuse
US4910490A (en) * 1989-06-28 1990-03-20 Gould, Inc. End terminal seal for an electric fuse
US5361058A (en) * 1993-11-02 1994-11-01 Gould Electronics Inc. Time delay fuse
US5367281A (en) * 1993-12-30 1994-11-22 Eaton Corporation Striker pin device for an electric fuse
US5892427A (en) * 1998-04-24 1999-04-06 Cooper Technologies Company Current limiting high voltage fuse
US20070236323A1 (en) * 2004-02-21 2007-10-11 Wickmann-Werke Gmbh Fusible Conductive Coil with an Insulating Intermediate Coil for Fuse Element
US20060119465A1 (en) * 2004-12-03 2006-06-08 Dietsch G T Fuse with expanding solder
US20060119464A1 (en) * 2004-12-06 2006-06-08 Muench Frank J Jr Current limiting fuse
US7477129B2 (en) * 2004-12-06 2009-01-13 Cooper Technologies Company Current limiting fuse
US7834738B2 (en) 2004-12-06 2010-11-16 Cooper Technologies Company Current limiting fuse
US8035473B2 (en) 2004-12-06 2011-10-11 Cooper Technologies Company Current limiting fuse
US20070132539A1 (en) * 2005-06-02 2007-06-14 Wickmann-Werke Gmbh Fusible spiral conductor for a fuse component with a plastic seal
US20090021339A1 (en) * 2005-06-07 2009-01-22 Siba Fuses Gmbh & Co. Kg High-voltage fuse
US9117615B2 (en) 2010-05-17 2015-08-25 Littlefuse, Inc. Double wound fusible element and associated fuse

Also Published As

Publication number Publication date
CH295510A (fr) 1953-12-31
FR1047970A (fr) 1953-12-18
DE936459C (de) 1955-12-15
GB692627A (en) 1953-06-10

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