US1638534A - Cartridge fuse - Google Patents

Cartridge fuse Download PDF

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Publication number
US1638534A
US1638534A US724372A US72437224A US1638534A US 1638534 A US1638534 A US 1638534A US 724372 A US724372 A US 724372A US 72437224 A US72437224 A US 72437224A US 1638534 A US1638534 A US 1638534A
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US
United States
Prior art keywords
plugs
tube
fuse
cartridge fuse
cartridge
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
US724372A
Inventor
Le Roy W Kelsay
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.)
AT&T Corp
Original Assignee
Western Electric Co Inc
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 Western Electric Co Inc filed Critical Western Electric Co Inc
Priority to US724372A priority Critical patent/US1638534A/en
Application granted granted Critical
Publication of US1638534A publication Critical patent/US1638534A/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

Definitions

  • My invention relates to fuses and particularly to fuses of the cartridge type.
  • the object of my invention is to provide a fuse of the type indicated which may be cheaply aanufactured and which shall be eflicient in operation.
  • tapered end plugs the inner ends of which are made of substantially the same diameter as the inside of the tube, are forced into the-ends of the insulating tube under pressure and securely fixed in position by metal ferrules spun against the outside of the tube.
  • the plugs are preferably provided with fins or ribs to prevent relative turning of the shell and plugs.
  • Fig. 1 shows a fuse of this invention in partial. longitudinal section
  • 1 indicates one of the end plugs, preferably of brass, the face of which has beenknurled or ribbed as at 2. to prevent the plug from turning in theshell 8
  • 3 designates the metal ferrule, the initial position of which before the spinning operation being indicated by the dot and. dash outline 4.
  • Numeral 5 designates the threaded shank which with the nut 6 and washer 7 constitute the binding post.
  • Fig. 2 is a cross-sectional view of Fig. 1 taken at line- 22.
  • the fusible link 10 is fastened into one ofthe end plugs,
  • the inner di ameter of the plug being of substantially the same diameter as the inside of the tube, causes the end of the tube to expand as shown by numeral 9. Then the other end plug is slipped over the fuse wire 10 and forced into the other end of the tube as shown at 9. To complete the process, ferrules 3 are spun over the expanded ends of the fibre tube, thus locking the assembly, and the fuse wire is soldered into place ll.
  • a hollow cylindrical casing a fusible link, frustro-conical contact plugs in the ends of said casing andsupporting said fusible link, said plugs being coneshaped and their largest diameter being greater. than the inside di' ameter of said casing and having external longitudinal ribs to engage the inside of said. casing, and cup-shaped ferrules secured over the distorted ends of said asing and including said plugs.

Description

S- 1927' LE ROY w. KELSAY CARTRIDGE FUSE Filed July 5. 1924 hw /0m za/Po W//m by AW] Patented Aug. 9, 1927.
UNITED STATESPATENT OFFICE.
LE ROY 11V. KEIiSAY, OF NEW YORK, N. Y., ASSIGNOR T0 WESTERN ELECTRIC COM- PANY, INCORPORATED, OF NEW YORK, N. Y., A CORPORATION OF NEW YORK.
CARTRIDGE FusE.
Application filed July 5,
My invention relates to fuses and particularly to fuses of the cartridge type.
The object of my invention is to provide a fuse of the type indicated which may be cheaply aanufactured and which shall be eflicient in operation.
Heretofore. it has been the practice to secure the end plugs to the cylindrical casing by screws, rivets, cement, or by spinning a ferrule into agroove in the casing. These methods necessarily weaken the structure of the fuse and involve expensive manufacturing operations. Again, the shrinking and swelling of the fibre tube, due to excessive dryness or moisture, causes an insecure condition in the types of construction mentioned.
In acordance with this invention, tapered end plugs, the inner ends of which are made of substantially the same diameter as the inside of the tube, are forced into the-ends of the insulating tube under pressure and securely fixed in position by metal ferrules spun against the outside of the tube. The plugs are preferably provided with fins or ribs to prevent relative turning of the shell and plugs. This arrangement provides a rigid and durable construction wherein the end plugs will not be blown off by the pressure of the gas generated when the fuses are blown, and will not become loose as the fibre expands or contracts,due to atmospheric conditions.
Referring to the drawing Fig. 1 shows a fuse of this invention in partial. longitudinal section, 1 indicates one of the end plugs, preferably of brass, the face of which has beenknurled or ribbed as at 2. to prevent the plug from turning in theshell 8, and 3 designates the metal ferrule, the initial position of which before the spinning operation being indicated by the dot and. dash outline 4. Numeral 5 designates the threaded shank which with the nut 6 and washer 7 constitute the binding post. Fig. 2 is a cross-sectional view of Fig. 1 taken at line- 22.
In assembling the fuse, the fusible link 10 is fastened into one ofthe end plugs,
1924. Serial No. 724,372.
preferably by soldering, and the fibre insulating cylinder 8 is forced over this frustroconical plug under pressure.
The inner di ameter of the plug, being of substantially the same diameter as the inside of the tube, causes the end of the tube to expand as shown by numeral 9. Then the other end plug is slipped over the fuse wire 10 and forced into the other end of the tube as shown at 9. To complete the process, ferrules 3 are spun over the expanded ends of the fibre tube, thus locking the assembly, and the fuse wire is soldered into place ll.
While I have shown the preferred em" bodiment of my invention, changes may be effected therein without departing from the spirit or scope thereof, as set forth in the appended claims.
hat is claimed is:
1. In an electrical cartridge fuse, a hollow cylindrical casing, a fusible link, frustro-conical contact plugs in the ends of said casing andsupporting said fusible link, said plugs being coneshaped and their largest diameter being greater. than the inside di' ameter of said casing and having external longitudinal ribs to engage the inside of said. casing, and cup-shaped ferrules secured over the distorted ends of said asing and including said plugs.
2. The method of making cartridge fuses which consists in forcing apertured tapered plugs into and expanding the ends of a hollow cylindrical tube, supportinga fusible. link in said plugs, and clamping collars around thetube ends and plugs.
3. The method of making cartridge fuses which consists forcing longitudinally ribbed frustro-conical end plugs into the ends of a hollow cylindrical fibre tube, the largest diameter of said plugs being greater than the inside diameter of said tube, and spinning metal caps over the expanded ends of said tube.
In witness whereof, I hereunto subscribe my name this 2 day of July, A. D. 1924.
, LE ROY W. KELSAY.
US724372A 1924-07-05 1924-07-05 Cartridge fuse Expired - Lifetime US1638534A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US724372A US1638534A (en) 1924-07-05 1924-07-05 Cartridge fuse

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US724372A US1638534A (en) 1924-07-05 1924-07-05 Cartridge fuse

Publications (1)

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US1638534A true US1638534A (en) 1927-08-09

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Application Number Title Priority Date Filing Date
US724372A Expired - Lifetime US1638534A (en) 1924-07-05 1924-07-05 Cartridge fuse

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4161714A (en) * 1977-10-25 1979-07-17 Gould, Inc. Electric fuse
DE2825669A1 (en) * 1978-06-12 1979-12-13 Vitus Hoegl Fuse with insulating tube - whose ends are axis symmetrically deformed to provide grip for end cap
EP0094988A1 (en) * 1982-05-13 1983-11-30 Littelfuse-Olvis A.G. Electrical cartridge fuselinks and a method of manufacturing same

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4161714A (en) * 1977-10-25 1979-07-17 Gould, Inc. Electric fuse
DE2825669A1 (en) * 1978-06-12 1979-12-13 Vitus Hoegl Fuse with insulating tube - whose ends are axis symmetrically deformed to provide grip for end cap
EP0094988A1 (en) * 1982-05-13 1983-11-30 Littelfuse-Olvis A.G. Electrical cartridge fuselinks and a method of manufacturing same

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