US2090220A - Electric fuse of the cartridge type - Google Patents

Electric fuse of the cartridge type Download PDF

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Publication number
US2090220A
US2090220A US120743A US12074337A US2090220A US 2090220 A US2090220 A US 2090220A US 120743 A US120743 A US 120743A US 12074337 A US12074337 A US 12074337A US 2090220 A US2090220 A US 2090220A
Authority
US
United States
Prior art keywords
cap
barrel
fuse
cartridge type
flange
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
US120743A
Other languages
English (en)
Inventor
Moor Ernest
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.)
WT Henleys Telegraph Works Co Ltd
Original Assignee
WT Henleys Telegraph Works 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 WT Henleys Telegraph Works Co Ltd filed Critical WT Henleys Telegraph Works Co Ltd
Application granted granted Critical
Publication of US2090220A publication Critical patent/US2090220A/en
Anticipated expiration legal-status Critical
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
    • H01H85/02—Details
    • H01H85/04—Fuses, i.e. expendable parts of the protective device, e.g. cartridges
    • H01H85/05—Component parts thereof
    • H01H85/143—Electrical contacts; Fastening fusible members to such contacts
    • H01H85/153—Knife-blade-end contacts

Definitions

  • This invention relates to electric fuses and cutouts of the cartridge type.
  • fuses of this type the fusible element is disposed in a tubular member and its ends are connected to terminal caps 5 mounted on the ends of the tubular member.
  • the tubular member or barrel is of a material such as porcelain that cannot be machined or drilled there arises a difiiculty in securing the closure member in a satisfactory manner.
  • the closure member or cap has generally been made in the form of a flanged lid which has been secured to the end of the barrel by making a cement joint between the flange and the peripheral surface of the barrel. This is unsatisfactory in that the cement is liable to disintegrate with the result that the whole fuse may fall to pieces when being handled or after it has been in service for some time.
  • cartridge fuse 5 there is fitted on each end of the barrel which houses the fuse element or elements, an apertured metal inner cap and a metal outer cap between which is located the bent over end of the fuse element.
  • the inner cap fits over the end of the barrel and is retained in position by spinning or pressing the edge of its circumferential flange into a circumferential groove in the barrel.
  • the outer cap fits over the inner cap and is retained in position thereon by soldering to the inner cap.
  • the inner cap is secured to the barrel in an inexpensive, reliable and permanent manner and the end of the element can be held in good contact with the inner face of the outer or with the outer face of the inner cap or with both these faces.
  • Figure 1 is a sectional elevation of one half of the fuse
  • Figure 2 is an end elevation of the fuse.
  • the barrel portion of the fuse shown in the drawing comprises a short cylindrical body I of porcelain having one or more longitudinal channels 2 which extend therethrough and are disposed symmetrically about the axis of the barrel.
  • a peripheral groove 4 is provided at the point where the change in external diameter occurs.
  • This groove is roughly of V-shape with the base of the V and the corners at the extremities of the V rounded off, particularly on the side of the groove nearer to the end of the barrel.
  • a thin inner cap preferably of copper.
  • This consists of a circular disc suitably apertured to correspond with the channels in the barrel and having a peripheral flange G of which the internal diameter corresponds to the external diameter of the reduced portion of the barrel.
  • the depth of the flange is such that its edge 1 extends approximately to the centre of the circumferential groove.
  • the edge l is then spun or pressed into the groove 4.
  • the pressure may be applied uniformly around the whole periphery of the flange or at multiplicity of points around the periphery.
  • a gasket 8 of asbestos or other suitable arc resisting, cushioning material is inserted between the face of the cap 5 and the end of the barrel I.
  • These elements 9 are bunched together and located in the centre of the passage but the stems diverge from one another so that near the end of the passage they lie on opposite sides thereof.
  • the extremities of the stems pass through the apertures in the cap and are bent over as shown at It] and pressed into engagement with the outer face of the cap 5. They may, if desired, be soldered as shown at H or welded to the cap or they may be soldered and welded to the cap.
  • the ends of the channels are then closed by plugs l2 of asbestos or the like.
  • an outer cap [3 which is of heavier gauge metal, preferably copper or brass, and consists of a circular disc having a circumferential flange 2
  • the outer cap [3 carries contact blades I4, each of which is formed with a base portion l5 which is riveted or welded, as shown at H5, or soldered, as shown at l8, to the outer face of the cap or the base portion may be riveted or welded, as shown at 16, and soldered, as shown at Hi, to the outer face of the cap.
  • the outer cap is pressed on the inner cap 5 so as to clamp the ends ID of the fusible elements between the two caps and is retained in position by soldering the edge of the flange 2! to the flange 6, as shown at H).
  • an asbestos gasket 20 is in serted between the bent over ends ll] of the elements and the inner face of the outer cap.
  • a cartridge fuse comprising at least one fuse element, a tubular member surrounding said element and having a pair of circumferential grooves in its peripheral surface, and, mounted on each end of said member, an apertured inner metal cap and an outer metal cap, between which is located a bent over end of said fuse element, said inner cap having a circumferential flange and fitting over the end of said member and being retained in position by the engagement of at least part of the edge of its flange in the adjacent.

Landscapes

  • Fuses (AREA)
US120743A 1936-01-25 1937-01-15 Electric fuse of the cartridge type Expired - Lifetime US2090220A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2401/36A GB468973A (en) 1936-01-25 1936-01-25 Improvements in or relating to electric fuses of the cartridge type

Publications (1)

Publication Number Publication Date
US2090220A true US2090220A (en) 1937-08-17

Family

ID=9738898

Family Applications (1)

Application Number Title Priority Date Filing Date
US120743A Expired - Lifetime US2090220A (en) 1936-01-25 1937-01-15 Electric fuse of the cartridge type

Country Status (5)

Country Link
US (1) US2090220A (de)
DE (1) DE675550C (de)
FR (1) FR816634A (de)
GB (1) GB468973A (de)
NL (1) NL44325C (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2680173A (en) * 1951-08-06 1954-06-01 Chase Shawmut Co Electric fuse
US3094600A (en) * 1960-12-01 1963-06-18 Chase Shawmut Co Electric fuse having improved cap link connection
US3257527A (en) * 1962-07-06 1966-06-21 English Electric Co Ltd Cartridge fuse having spacer disc

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3739051C2 (de) * 1986-11-19 1995-02-23 Yazaki Corp Sicherung

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2680173A (en) * 1951-08-06 1954-06-01 Chase Shawmut Co Electric fuse
US3094600A (en) * 1960-12-01 1963-06-18 Chase Shawmut Co Electric fuse having improved cap link connection
US3257527A (en) * 1962-07-06 1966-06-21 English Electric Co Ltd Cartridge fuse having spacer disc

Also Published As

Publication number Publication date
FR816634A (fr) 1937-08-12
GB468973A (en) 1937-07-16
NL44325C (de)
DE675550C (de) 1939-05-11

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