US1048859A - Electric fuse. - Google Patents

Electric fuse. Download PDF

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Publication number
US1048859A
US1048859A US69225912A US1912692259A US1048859A US 1048859 A US1048859 A US 1048859A US 69225912 A US69225912 A US 69225912A US 1912692259 A US1912692259 A US 1912692259A US 1048859 A US1048859 A US 1048859A
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United States
Prior art keywords
strip
fuse
circuit terminals
exposed
terminals
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Expired - Lifetime
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US69225912A
Inventor
Thomas E Murray Jr
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Individual
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Individual
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Priority to US69225912A priority Critical patent/US1048859A/en
Application granted granted Critical
Publication of US1048859A publication Critical patent/US1048859A/en
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Expired - Lifetime legal-status Critical Current

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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
    • H01H85/041—Fuses, i.e. expendable parts of the protective device, e.g. cartridges characterised by the type
    • H01H85/046—Fuses formed as printed circuits

Definitions

  • the invention relates to electric fuses.
  • My invention has for its object to localize the blowing of the fuse to a predetermined fractional part of the fuse strip itself, and thus to prevent the destructive effect of the explosion from extendin to said circuit terminals to which the strip is connected at its on s.
  • My invention consists in a fuse strip, to which the circuit terminals are connected, disposed in contact with two bodies of nonpulverulent refractory insulating material, which extend from the circuit terminals over fractions of the length of the strip, so that an uncovered portion of the strip is exposed between them.
  • blowin of the fuse is localized to the uncovere portion, and the terminals are protected.
  • the protecting bodies are of asbestos or other flexible fabric.
  • Figure 1 is a 'view of my fuse, with the protective envelop in lace.
  • Fig. 2 is a longitudinal 1g. 3 is a view of the fuse, with the protective envelop removed.
  • Fig. 4 is I a cross section.
  • the fuse stripA-ds preferably made with the usual contraction B in its middle portion, and with its ends doubled over and perforated for the convenient attachment of the circuit terminals C, Fig. 2.
  • Extending from each circuit terminal and enveloping the strip is a wrapping D, D of asbestos or other refractory insulating material.
  • a portion E of the strip between the ends of the wrappings is left exposed.
  • the wrap plugs are secured in place by a Winding F,
  • the device bein'g exposed to the atmosphere.

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  • Fuses (AREA)

Description

Max
T. E. MURRAY, JR. ELECTRIC FUSE. APPLICATION FILED APR. 22, 1912.
- Patented Dec. 31, 1912.
THOMAS E. MURRAY, .m., or NEW xonx, N. Y.
nnncrnrc FUSE.
Specification of Letters Patent.
Patented Dec. 31,1912.
Application filed April 22, 1912. Serial No. 692,259.
To all whom it may concern:
Be it known that I, THOMAS E. MURRAY, Jr., a citizen of the United States, residing at New York, in the county of New York and State of New York, have invented a certain new and useful Improvement in Electric Fuses, of which the following is a specification.
section.
' The invention relates to electric fuses. As
such fuses are commonly constructed, the circuit connections are attached to the plug, casing or other support for the strip, and arranged so that a new strip can be substituted for a strip which has blown. Where the explosion not only destroys the strip, but also melts or injures the circuit terminals, it is obviousthat not only a new fuse strip but a new support or plug must be provided.
My invention has for its object to localize the blowing of the fuse to a predetermined fractional part of the fuse strip itself, and thus to prevent the destructive effect of the explosion from extendin to said circuit terminals to which the strip is connected at its on s.
My invention consists in a fuse strip, to which the circuit terminals are connected, disposed in contact with two bodies of nonpulverulent refractory insulating material, which extend from the circuit terminals over fractions of the length of the strip, so that an uncovered portion of the strip is exposed between them. By this means, the
blowin of the fuse is localized to the uncovere portion, and the terminals are protected. Preferably, the protecting bodies are of asbestos or other flexible fabric.
In the accompanying drawings-Figure 1 is a 'view of my fuse, with the protective envelop in lace. Fig. 2 is a longitudinal 1g. 3 is a view of the fuse, with the protective envelop removed. Fig. 4 is I a cross section.
V Similarletters of reference indicate like parts.
The fuse stripA-ds preferably made with the usual contraction B in its middle portion, and with its ends doubled over and perforated for the convenient attachment of the circuit terminals C, Fig. 2. Extending from each circuit terminal and enveloping the strip is a wrapping D, D of asbestos or other refractory insulating material. A portion E of the strip between the ends of the wrappings is left exposed. The wrap plugs are secured in place by a Winding F,
of cord, or in any other suitable way. By reason of this construction, the blowing of the fuse-is caused to occur in the exposed portion E, and its destructive effect does not extend beyond a short distance inward from the ends of the wrappings D. Hence said effect does not reach the terminals C.
I am-awarethat a fuse strip has been disposed in a case filled with powdered lime or thelike, and passed through a paper drum embedded in said lime, so that an air space is formed around the middle portion of the strip. By my construction, the fuse case,
the pulverulent filling and the paper drum are all done away with and a complete fuse,
affording ample protection to its circuit terminals and which may be exposed to the atmosphere without any further covering, 1s obtained by simply applying the refractory material to the strip and its terminals,
as herein set forth, the device bein'g exposed to the atmosphere.
I claim:
1. A fuse strip, circuit terminals connected thereto, and two exposed. envelops of refractory insulating material respectively covering a fraction of the length of said strip and respectively in contact with said circuit terminals.
2. A fuse strip, circuit terminals con nected thereto, and two exposed wrappings of flexible refractory insulating material respectively covering fractions of the length of said strip and respectively in contact with said circuit terminals.
In testimony whereof I have afiixed my signature in presence of 'twowitnesses.
THOMAS E. MURRAY, J R. Witnesses:
Gnn'rnnna T. PORTER, MAI T. MOGARRY.
US69225912A 1912-04-22 1912-04-22 Electric fuse. Expired - Lifetime US1048859A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US69225912A US1048859A (en) 1912-04-22 1912-04-22 Electric fuse.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US69225912A US1048859A (en) 1912-04-22 1912-04-22 Electric fuse.

Publications (1)

Publication Number Publication Date
US1048859A true US1048859A (en) 1912-12-31

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ID=3117126

Family Applications (1)

Application Number Title Priority Date Filing Date
US69225912A Expired - Lifetime US1048859A (en) 1912-04-22 1912-04-22 Electric fuse.

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