(No Model.)
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`N01 438,305.
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`T. A. EDISON.
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`FUSE BLOCK.
`Patented Oct. 14, 1890.
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`Pg. 001
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`Hunting Titan, Inc.
`Ex. 1025
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`Hunting Titan, Inc.
`Ex. 1025
`Pg. 001
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`_ UNITED STATES PATENT OFFICE.
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`THOMAS A. EDISON, OF MENLO PARK, NEXV JERSEY.
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`FUSE-BLOCK.
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`SPECIFICATION forming part of Letters Patent No. 438,305, dated October 14, 1890.
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`Application filed October 14, 1885. Serial No. 179,866.
`(No model.)
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`To aZZ whom, it may concern.-
`Be it known that I, THOMAS A. EDISON, of
`Menlo Park, in the county of Middlesex and
`State of New Jersey,have invented a certain
`new and useful Improvement in Lightning-
`Arresters, (Case No. 64:4,) of which the follow-
`ing is a specification.
`My invention relates to fusible safety-
`catches or ligh tning—protectors for telephones,
`telegraph, and similar circuits, in which the
`fusible wire is placed in an inclosing shell or
`chamber of insulating material; and my ob-
`ject is to prevent or diminish the liability to
`surface creeping of lightning or other power-
`ful current alOug the outside of such shell or
`chamber.‘
`‘
`To this end, my invention consists'in pro-
`viding flanges of insulating material on the
`outside of the shell or chamber, so as to in-
`crease the surface distance between the ter-
`minals of the safety-catch.
`My invention is illustrated in the accom-
`panying drawings, in which—
`Figure 1 is a view in elevation of a safety-
`catch receptacle embodying my invention;
`Fig. 2, a vertical longitudinal section of the
`same; Fig. 3, a transverse section of the re-
`ceptacle, and Fig. 4 a transverse section of
`a modified form thereof.
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`A is a cylindrical piece of insulating mate-
`rial, having a longitudinal slot or groove a,
`in which is placed the strip of metal foil bor
`other piece of readily-fused metal. The slot
`is closed by a longitudinal plug (3, preferably
`of the same material as A.
`Instead of this
`I may employ a continuous cylinder 9, Fig.
`at, of insulating material, with a hole It through
`it for the fusible strip.
`In either case Iform
`or provide the insulating-receptacle With
`flanges or shoulders 2', which are of insulat-
`ing material, being preferably made in one
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`piece with the receptacle. The flanges are
`continuous, entirely encircling the receptacle,
`and Where the plug 0 is used it passes under
`the flanges through the slot c. There may
`be any desired number of these flanges.
`Heretofore there has always been danger
`of the electricity passing along the surface
`of the insulating-case, especially if the same
`is damp; but this danger is obviated by my
`invention.
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`To connect the fusible strip in circuit, a
`metal cap dis placed upon each end of the
`receptacle, and to these caps the ends of the
`strip b are soldered. The receptacle is then
`inserted between springs or free circuit-ter-
`1ninals,6.,e,_,which bear firmly upon tiie‘c‘a‘p's "
`and/to which the circuit-wires f f are con-
`nected. The springs are secured to any suit-
`able support.
`The passage of an abnormal electric cur-
`rent fuses the safety—catch and breaks the
`circuit, as will be understood.
`“That I claim is—
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`1. The combination, with an insulating-re-
`ceptacle having one or more external insu-
`lating-flanges, of a safety - catch supported
`therein,
`the terminals of which extend to
`either end of the receptacle, and free circuit-
`terminals co—operating therewith, substan-
`tially as described.
`2. The combination, with a receptacle hav-
`ing one or more external flanges, of a safety“
`catch supported therein and conducting-caps
`at either end of the receptacle to which said
`catch is connected, substantially as described.
`This specification signed and witnessed this
`14th day of January, 1885.
`THOS. A. EDISON.
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`Witnesses:
`WM. H. MEADOWCROFT,
`T. G. GREENE, Jr.
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`Pg. 002
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`Hunting Titan, Inc.
`Ex. 1025
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`Hunting Titan, Inc.
`Ex. 1025
`Pg. 002
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