US3624580A - Cartridge fuses - Google Patents

Cartridge fuses Download PDF

Info

Publication number
US3624580A
US3624580A US10443A US3624580DA US3624580A US 3624580 A US3624580 A US 3624580A US 10443 A US10443 A US 10443A US 3624580D A US3624580D A US 3624580DA US 3624580 A US3624580 A US 3624580A
Authority
US
United States
Prior art keywords
strip
strips
fuse
secured
end cap
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
Application number
US10443A
Other languages
English (en)
Inventor
William James Elliott
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Brush Electrical Engineering Co Ltd
Original Assignee
Brush Electrical Engineering Co Ltd
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.)
Filing date
Publication date
Application filed by Brush Electrical Engineering Co Ltd filed Critical Brush Electrical Engineering Co Ltd
Application granted granted Critical
Publication of US3624580A publication Critical patent/US3624580A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • H01H85/02—Details
    • H01H85/04—Fuses, i.e. expendable parts of the protective device, e.g. cartridges
    • H01H85/05—Component parts thereof
    • H01H85/055—Fusible members
    • H01H85/12—Two or more separate fusible members in parallel

Definitions

  • each strip is inclined to a radius of the end cap to which it is secured in one direction circumferentially of the end cap and the other end portion of the strip is inclined to a radius of the end cap to which it is secured in the other direction circumferentially of the end cap, whereby an intermediate portion in the length of the strip is directed widthwise of the strip radially of the tubular body to reduce thermal shock on the body when the fuse blows.
  • the invention relates to a cartridge fuse of the kind used in the electrical industry and comprising a tubular body, a pair of end caps for the body and a plurality of fusible elements extending through the body between the end caps.
  • the elements are usually strips of metal and in known fuses of the foregoing kind the strips have been arranged to extend substantially parallel with the longitudinal axis of the body and side-by-side in one or more rings concentric with the longitudinal axis of the body.
  • An object of the invention is to provide a fuse in which the arrangement of the fusible elements is such that accommodation for an optimum number of elements is provided consistent with acceptable current density in the end caps, reduced thermal shock to the tubular body on operation of the fuse and substantially constant fusion characteristics for each element.
  • a cartridge fuse comprises a tubular body, a pair of end caps for the body and a plurality of fusible elements extending through the body between the end caps, the elements being in the form of metallic strips secured to each end cap at positions spaced apart in the circumferenu'al direction thereof, such that the strips are spaced apart from each other along their whole lengths intermediate the end caps, the position of one end of each strip being circumferentially staggered with respect to the other end thereof.
  • each strip is inclined to a radius of the end cap to which it is secured in one direction circumferentially of the end cap and the other end portion of the strip is inclined to a radius of the end cap to which it is secured in the other direction circumferentially of the end cap, whereby an intermediate portion in the length of the strip is directed widthwise of the strip substantially radially of the tubular body.
  • each end cap comprises an inner member to which the strips are secured and an outer member engaging the inner member and by which the fuse is connected in an electrical circuit, each inner member having a circumferentially serrated aperture therein closed by the adjacent outer member, the side edges of the serrations forming end locations for the strips.
  • the serrations may be of substantially V-shape and each have side edges inclined equiangularly in opposite directions to a radius of the end cap.
  • the strips conveniently extend through the inner end caps and are bent to lie on the outer surfaces thereof to which they are secured.
  • FIG. 1 is i side elevation of and part axial section through the fuse
  • FIG. 2 is a section on the line IIlI in FIG. 1, and
  • F l0. 3 is a diagrammatic perspective view of the inner end cap members and one fusible element.
  • the fuse comprises a tubular body 1 of a ceramic material on to the ends of which inner end cap members 2, 2' are fitted.
  • Each member 2, 2' has a central aperture 3 therein having a serrated circular boundary formed by substantially V-shaped serrations symmetrical about radii indicated at 4 in FIG. 3. The side edges of the serrations are indicated at 5 and 6 respectively.
  • the fuse also includes a plurality of fusible elements which are in the fonn of strips 7 of fusible metal 2, 2'.
  • Each strip 7 is located against one of the side edges 6 of a serration in one member 2, and against the other of the side edges 5 of a serration in the other member 2', as indicated in FIG. 3 and a portion at each end of the strip projects through the member 2 or 2' and is then bent over to form a tab 8, 9, which is secured to the outer end face of the member 2 or 2' by soldering or similar process.
  • the opposite ends of the strip 7 are staggered circumferentially with respect to each other. That is the serration having the locating edge 5 employed for locating the left-hand end of the strip 7, as viewed in FIG. 3, and the serration having the locau'ng edge 6 employed for locating the right-hand end of the strip 7 are spaced apart in the circumferential direction instead of being axially aligned. This means that a plurality of strips will together generate a convergent-divergent tubular cagelike structure in the form of a hyperboloid. This is more clearly seen in FIG. 1.
  • the strips As is well known in cartridge fuses employing metal strips, the strips usually have longitudinally spaced notches in their longitudinal edges to aid their fusion; but the strips have been shown as being unnotched to avoid complication in the drawings.
  • the ceramic body 1 is packed with a quenching medium such as dry, nonmetallic, silica sand.
  • the quenching medium is indicated at 10 in FIG. 1 between the outside of the cagelike structure and the body 1 only, although in practice, the quenching medium will completely fill the interior of the body 1, that is the strips 7 will be completely embedded in the quenching medium.
  • the symmetrical V-shaped serrations in the members 2, 2 avoid the need for having lefthanded and right-handed members 2, 2.
  • the members 2, 2' are identical and can be interchanged. This means that the members can be mass produced, for example, by stamping.
  • the members 2, 2' are a tight fit into outer members ll, 11', which close the respective apertures 3 and also enable electrical connections to be made to the fuse, one connection position being indicated at 12'.
  • the members 2 and 11 and 2' and 11 respectively constitute the end caps of the fuse.
  • a cartridge fuse comprising a tubular body, a pair of end caps for the body and plurality of fusible elements in the form of metallic strips extending through the body between the end caps, the end caps having locating surfaces of which, locating surfaces of the two end caps are respectively inclined in opposite directions, relative to a radial direction thereof, the elements being secured to each end cap at positions spaced apart in the circumferential direction thereof, such that the strips are spaced apart from each other along their whole lengths intermediate the end caps, the position of one end of each strip being circumferentially staggered with respect to the other end thereof and one end portion of each strip being inclined by one of said locating surfaces to a radius of the end cap to which it is secured in one direction-circumferentially of'the end cap and the other end portion of the strip being inclined by another of said locating surfaces to a radius of the end cap to which it is secured in the other direction circumferentially of the end cap, whereby an intermediate portion in the length of the strip is directed widthwise of the strip substantially radially
  • each end cap comprises an inner member to which the strips are secured and an outer member engaging the inner member and by which the fuse is connected in an electrical circuit, each inner member having a circumferentially serrated aperture therein closed by the adjacent outer member, the side edges of the serrations forming end locations for the strips.
  • a fuse as claimed in claim 2 in which the strips extend through the inner members and are bent to lie on the outer surfaces thereof to which they are secured.
  • a cartridge fuse comprising a tubular body, a pair of end caps for the body and a plurality of fusible elements in the fonn of metallic strips extending through the body and secured between the end caps, each end cap comprising an inner member to which the strips are secured and an outer member engaging the inner member and by which the fuse is connected in an electrical circuit, each inner member having a circumferentially serrated aperture therein closed by the adjacent outer member, the serrations being of substantially V- shape and each having side edges inclined equiangularly in opposite directions to a radius of the end cap, one end portion of each strip being located against one side edge of a serration of one inner member and the other end portion of the strip being located against the oppositely directed side edge of a circumferentially spaced serration of the other inner member, whereby the strips are spaced apart from each other along their whole lengths intermediate the end caps and an intermediate portion in the length of each strip is directed widthwise of the strip substantially radially of the tubular body.

Landscapes

  • Fuses (AREA)
US10443A 1969-03-01 1970-02-11 Cartridge fuses Expired - Lifetime US3624580A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1107969 1969-03-01

Publications (1)

Publication Number Publication Date
US3624580A true US3624580A (en) 1971-11-30

Family

ID=9979642

Family Applications (1)

Application Number Title Priority Date Filing Date
US10443A Expired - Lifetime US3624580A (en) 1969-03-01 1970-02-11 Cartridge fuses

Country Status (5)

Country Link
US (1) US3624580A (fr)
CH (1) CH501995A (fr)
DE (1) DE2008453A1 (fr)
FR (1) FR2034590A1 (fr)
GB (1) GB1232913A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004105069A1 (fr) * 2003-05-26 2004-12-02 Abb Sp. Z O. O. Fusible pour substrat, du type haute tension en couche mince et a capacite de rupture elevee

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2209823A (en) * 1936-12-16 1940-07-30 Gen Electric Fuse
US2680173A (en) * 1951-08-06 1954-06-01 Chase Shawmut Co Electric fuse
US2866037A (en) * 1954-12-30 1958-12-23 Gen Electric Electric current limiting fuse
US3287525A (en) * 1965-02-26 1966-11-22 Mc Graw Edison Co Terminal means for fusible element of current limiting fuse
US3400235A (en) * 1966-12-28 1968-09-03 Gen Electric Canada Current limiting fuse

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2209823A (en) * 1936-12-16 1940-07-30 Gen Electric Fuse
US2680173A (en) * 1951-08-06 1954-06-01 Chase Shawmut Co Electric fuse
US2866037A (en) * 1954-12-30 1958-12-23 Gen Electric Electric current limiting fuse
US3287525A (en) * 1965-02-26 1966-11-22 Mc Graw Edison Co Terminal means for fusible element of current limiting fuse
US3400235A (en) * 1966-12-28 1968-09-03 Gen Electric Canada Current limiting fuse

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004105069A1 (fr) * 2003-05-26 2004-12-02 Abb Sp. Z O. O. Fusible pour substrat, du type haute tension en couche mince et a capacite de rupture elevee
US20070159291A1 (en) * 2003-05-26 2007-07-12 Abb Sp.Zo. O. High-voltage thick-film high rupturing capacity substrate fuse

Also Published As

Publication number Publication date
DE2008453A1 (de) 1971-03-18
CH501995A (fr) 1971-01-15
GB1232913A (fr) 1971-05-26
FR2034590A1 (fr) 1970-12-11

Similar Documents

Publication Publication Date Title
US3935553A (en) Cartridge fuse for d-c circuits
US4506249A (en) Fuse element termination for current-limiting fuse
DE2723487C2 (fr)
US3825870A (en) Fuse element and a high voltage current-limiting fuse
US2157907A (en) Fuse
US3801945A (en) Quick acting high voltage fuse
US2658974A (en) High current carrying capacity current-limiting fuses
US3624580A (en) Cartridge fuses
US2866037A (en) Electric current limiting fuse
US4099153A (en) Gas evolving clamp for current limiting fuse
US2720567A (en) Cartridge fuse fusible element
US3251968A (en) Fuse structures formed of concentric fuse tubes to provide a maximum heat radiating surface and a novel venting means
US4167723A (en) Electric fuse having gas-evolving material
US3400235A (en) Current limiting fuse
US2826660A (en) Current-limiting fuses with fuse links arranged in radial planes
US4125819A (en) Electric fuse with equalized filler duty
US4210892A (en) Electric fuse having helically wound fusible elements
US4511874A (en) Fatigue-resistant fuse strip
US1540119A (en) Renewable fuse element
US3611239A (en) High-voltage fuse having inner core and outer shell fuse links
US4349802A (en) Current limiting fuse having transverse parallel weak spots
US3317691A (en) Current-limiting fuse
US3680019A (en) High-voltage fuse having a plurality of fuse links wound helically around an insulating mandrel
US2275873A (en) Fire detector cable
US4057776A (en) Fuse with radially oriented elements