US1417966A - Renewable cartridge fuse - Google Patents

Description

T. A. BOTH.

RENEWABLE CARTRIDGE FUSE. APPLICATION HLED ULY18, 1913.

'Patented May 30,1922.

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TONJES A. BOTH, OF STRATFORD, CONNECTICUT, ASSIGNOR TO THE CONNECTICUT ELECTRIC MANUFACTURING COMPANY, A CORPORATION OFCONNECTICUT.

RENEWABLE CARTRIDGE FUSE.

Application filed July 18,

neetieut, have invented an Lmprovement in Renewable Cartridge Fuses, of which the following is `a specication.

This invention relates .to renewable cartridge fuses of both the errule and :blade .types and vhas 'for its object toprovide a fuse ventilated at the ends and `provided with ree Jractory heads so as to prevent injury to a marble switch `base in the event of the blow out, to prevent -arcing, to prevent iusing oi? any of the movable yparts and to prevent the substitution ot wire. for a i'use strip inthe event of a blow out. A further object of the invention is to providea fuse strip having stops so located withrelationto the heads as to properly locate the indications on the strip with relation to the holes in the ferrules.

With these and other objects in view, I have devised .the renewable iiuse which I will now describe referring to the accompanying drawing forming a part-oi this specification and using reference characters to indicate the several parts.

Figure l is a side elevation of one `of .my novel fuses ot the .terrule type;

Figure 2 `an end elevation corresponding therewith Figure 3 a section onthe .lineB-B in Figure il;`

Figure l a longitudinal section of a fuse oii the ferrule type;

Figure 5 a perspective view oi' one of the refractory heads, detached;

yFigure 6 a perspective view of the fuse strip, detached; l

Figure 7 a perspective view of one end of a fuse ot' the iferrule type, showing the parts disassembled;

Figure S a side elevation et one endo-f a 4fuse of the blade type;

Figure Sa a longitudinal section o'ii the other end of the luse, which has been given a quarter turn; y j 1 Figure 9 an end elevation partly broken away,as seen from the rightin Figure Sn;

Specification of Letters Patent.

Patented May 30, 1922.

1918. Serial No. 245,550.

Figure l0 a similar view illustrating a variant 'form of blade, and

Figure ll is a section on the line 11.-11 in Figure l0.

2O denotes the body which is ordinarily a iibre tube, and is externally threaded at its ends for vengagen/lent by internal threads on the errules 2l. The ends of the body are closed by heads which are made of rciractory or relatively non-fusible material, being preferably moulded trom vitreous material, as" porcelain or glass. can be used it preferred, or even a high grade oi compressed fibre. I preferably, however, use vitreous material as it cannot be drilled an Ad consequently prevents the substitutionofwire ior a 'fuse strip in the event ot a blow out.` 23 denotes the y'luse strip which is preferably made narrowest at its midlength so that fusing will taire place midway between `the heads, and is provided "with indications 24 which show the safetyT1 ainperage ofi theflusefand with stops 25, 4which are shown as formed by displacing metal of the strip laterally, vand are so located with relation to the headsas to prevent longitudinal movementand iiX the indications', when assembled, in alinement with holes 26 in the Bakelite ierrules, which in this 'form may beplaced centrally. The heads are provided with slots 27, ordinarily vplaced at one side ofthe center, .with shoulders Q8 adapted to .resten `the ends et" the body, with 'lugs 29 adapted =to engage notches 30 in the ends of the' body yto lool; the heads and body against relative 'rotary movement, and in their edges with one or more .*entilating channels which permit the gases generated by a blow outto pass through without danger of burstingthe body orblowing oft' fthe head. A

ln assembling, one end of the ijuse strip `is .passed through the slot ina head, the corresponding stop is drawn against the inner side oi? the 'head andthe end of the fuse strip is bent over the outer side oit Athe head, asin Figure .7, leaving the indication visible. The head `is then inserted in the `body with the lugs on the head in engagement with the notches in the body, and the lerrule is turned to place. `hen the other end ot the Ytuse passed through the slot in the other he: l, thc stop is drawn against the inner side o1'E the head and the head is seated in the end ol the body as bei'ore, except that the head is given a halt turn so as to place the slot on the opposite side oi? the body which causes the iuse strip to pass obliquely through the body. rIhen the end ot the iiuse strip is bent over the outer side ot the head as before and the lerrule is turned to place. It will be noted that the thickness ol the fuse strip, which is clamped between the head and the terrule, at each end, leaves the head and the ferrule separated and provides a gas chamber, indicated by 32; From this chamber, in the event olf a blow out, the gas can pass out freely through holes in the end of the ferrule,

In devising my present construction care has been taken to avoid serious objections to fuses now upon the market. The effective end ventilation prevents injury to a marble base and prevents either bursting oi. the body or blowing off of a head in the event oit a blow out, and the non-use oit metallic parts with the exception of the ierrules, which are ei?- iectively insulated by the body and the heads, does away with all danger or arcing, and with all danger of the fusing of metallic connecting parts which has heretobeiore rendered many so called renewable fuses useless after a blow out.

It is of course well understood that the smaller sizes of fuses, that is fuses it'or G0 amperes and under, are ordinarily oit the ferrule type and fuses for 100 amperes and upward are of the blade type. In Figures 8 to ll inclusive I have illustrated forms ot renewable fuses of the blade type, the ditference being that in the latter type the circuit is through the blades which are in electrical contact with the fuse strip.

In Figures 8a and 9, 34e denotes the blade which is formed from a piece oi? sheet metal tubing flattened to place the sides in parallelism but not in contact. The object being to leave a longitudinal passage between the sides of the flattened tube 'for the escape ot gas through the blade itself Yfrom chamber 82 in the event of a blow out. The inner end of the blade is provided with a base 3G which is formed by splitting the flattened tube and bending the sides outward at right angles to the blade. The base is provided at one side ofthe blade with a hole 37 through which the indication is visible. In this form the heads are provided on the outer side at the edges with notches 38 which are engaged by lugs 39 on the bases. These lugs and notches lock the blades against rotary movement relatively to the heads and insure that the holes 37 will always be in alinement with the indications, The `lierrules in this torni, .indicated by a0, are provided with relatively large holes 4:1 through. which the blades eX- tend and the indications are visible.

The form illustrated in Figures 10 and ll diifers in that the blade, indicated by 42, is formed from a flat bar or strip of metal which is split at its inner end and the base i3 is formed by bending the sides outward at right angles to the blade as before. The ventilation in this form is through holes 44 in the base. 'Ihe notches 38 and lugs 39 are the same as in the other form.

Having thus described my invention, I claim:

l. In a fuse of the character described an insulating tubular body, removable refractory heads closing the ends of the body and provided with slots and in their edges with ventilating channels, a iuse strip passing through the slots and having its ends bent over the outer sides oit the heads, and ferrules having holes in their ends and threaded engagement with the body.

2. In a iuse ol thc character described an insulating tubular body having notches in ils ends, removable refractory heads having shoulders engaging the ends of the body, and provided. with slots, lugs engaging the notches, a. fuse strip passing through the slots and having' its ends bent over the outer sides of the heads, and ferrules engaging the body.

3. In a fuse oi the character described a body, removable refractory heads closing the ends of the body and provided in their ed with Ventilating channels, a fuse strip passing through the heads and having its ends bent over the outer sides oit the heads, ferrules engaging the body and leaving chainbcrs between the heads and the terrules, and means for permitting escape oit gas trom, the chambers.

4. In a :fuse an insulating tubular body, refractory heads having Ventilating channels, a fuse strip passing through the heads, ventilating blades having bases contacting with the iuse, and Ferrules engaging the body.

5. In a fuse an insulating tubular body, refractory heads having Ventilating channels, a fuse strip passing through the heads, ventilating blades comprising fiat metal tubes having the side walls at their ,inner ends bent outwardly in opposite directions, and ferrules engaging the body by which the parts are retained in place.

6. In a fuse an insulating body, a fuse strip, blades having a Ventilating passage extending longitudinally therethrough. and means tor connecting the blades to the body.

7. A Ventilating fuse blade comprising a fiat metal tube with the sides of the inner end of the tube bent outwardly in opposite directions to formv a base.

S. A blade for a cartridge fuse having a Ventilating passage extending longitudinally therethrough. l u a 9. A head for renewable cartridge fuses made of refractory material and provided with a fuse slot, and with one or more ventilating channels in its edge.

`10.` A head for renewable cartridge fuses made of refractory material and provided with Shoulders, with a lug, with'a fuse slot7 and with one or more ventilatingchannels in its edge.

In testimony whereof I aiiix my signature.

TONJES A. BOTH.

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