US1755546A - Renewable fuse - Google Patents

Description

April 22, 193 F: c. LAVARACK 1,755,546

RENEWABLE FUSE Filed March 25, 1928 V i I Patented Apr. 22, 1930 UNITED STATES PATENT QFFKIE FREDERICK C. LAVARACK, OF MONTCLAIR, NEW JERSEY, ASSIGNOR TO GREAT WEST- ERN FUSE COMPANY, OF PITTSBURGH, PENNSYLVANIA, A CORPORATION OF DELA- WARE V RENEWABLE FUSE Application filed March 23, 1928. Serial No. 284,141.

The object which I have in view is the provision of a new and improved renewable fuse which will be efficient inservice, easy to take apart for repair or renewal of the 6 fusible link and to reassemble, and of simple and inexpensive yet durable construction. lVith these objects in View I have invented the improved renewable fuse hereinafter'described and claimed.

In the accompanying drawings, where n I have illustrated the best embodiment of the principles of my invention now known to me, Fig. 1 is a longitudinal'section of the fuse.

Fig. 2 is an outer end view of one of the ferrules. V v

Fig. 3 is a broken side elevation of one of the terminal blades with the slotted washer and sealing disk slipped thereon.

Fig. 4 is a plan View of the slotted washer and the sealingdisk with their slots in registration. I l

Fig. 5 is a reverseplan View of the same with the disk in its sealing position relative to the washer.

' Fig. 6 is a side elevation of the terminal blades to which the slotted'washer and the sealing disk are applied.

Fig. 7 is an inner end view of the same. Fig. 8 is a broken side elevation of one end i of the fuse, with the screw cap omitted and the sealing disk in section to better show it in its sealing position.

7 Fig. 9 is a broken elevation of the other endof the fuse with the screw cap in section.

'"" v Fig. 10 is an inner end view of the terminal blade shown in Fig. 9.

7 Referring first to the drawings, 1 represents the cylindrical shell of insulating material, such as fibre.

2 represents metallic ferrules mounted on the ends of the shell and fixedly attached thereto, as by threaded engagement and riveting. A The ferrules" on the twoends of the shell are preferably the same in structure.

'Each of the ferrules has a pair of diamet ricitlly opposed recesses or seats 3 out inits enc.

The shell and its ferrules form the tubular body of the fuse.

The outer ends of the ferrules 2 are' ex e axis of the disk.

riorly threaded for the application of the usual annular screw caps 4:.

and 6 represent the two metal terminal blades to whose reduced inner ends the fusible link 7 is detachably secured, as by the screwbolts 8.

One of said blades 5, has permanently mounted thereon the circular metal closure head 9 which fits against the end of the corresponding ferrule 2 and is provided on its inner face with a diametrically disposed rib which engages the seat 3 and thus prevents the head and blade from rotation relative to the ferrule. v V

The annular screw-cap 4 is slipped down over the blade 5 and screwed onto the ferrule to clamp the closure head and blade in position relative to the shell.

The other terminal blade 6 is provided with opposed notches 11 forming between them a neck of reduced width.

Adjacent to said reduced neck and on the inner side thereof a fixed abutment or plate 12 is mounted on the blade, protruding on each side thereof, as best illustrated in Fig. 7.

When the fuseis assembled the abutment 12 lies substantially flush with the outer end of the ferrule 2. h

13 represents 7 a slotted metal washer which slips down over the outer end of the blade 6 and rests against the abutment 12 and also against'the end of the ferrule to close the end of the fuse body.

The washer 13 is provided on its inner face with a pair of lugsle which engage the seats 3 in the end of the ferrule and thus prevent rotation of the washer and the blade relative to the shell. 7 y

15 represents the sealing disk which is a metalplate preferably circular and of sub-' stanti ally the same diameter as the washer The disk 15 is provided eccentricallly of its center with a slotted opening 16 of sufficient width and length to allow the di sk to be slipped down over the blade 6. f H

17 represents a second aperture of shorter length opening at one side into the aperture 16 but symmetrically disposed relative to the The aperture 17 isof propel dilllfiHSiOhS to slotted opening 18 disposed on a line inter-set.

ing the axis of the disk and engaged by a headed screw 19 screwed into a threaded hole in the washer.

Thus the disk may be moved into the position relative to the washer shown in Fig. 4 with the aperture 16 of the disk registering with the slot of the washer or into the position shown in Fig. 5 wherein the aperture 17 of the disk registers with the slot of the washer.

The slotted washer and the sealing, .disk in the relation illustrated in Fig. 5L are slipped down over the blade 6 until the slotted washer rests on the abutment 12 and its lugs 14 occupy the seats3.

, The sealing disk is then slid into its relative position illustrated in Fig. 5, with the aperture 17 embracing the neck of thehlade between the notches 11.

It is evident that the disk thus seals from without the ends of the slot of the washer 13 and the sides of said ,slot are sealed from within by the abutment 12, so that when the annular cap ,4 is slipped over the blade 6 and screwed up on the ferrule, thus ,clamping the washe 3 be ween the abutment 12 and the sealing di and also against the end of the ferrule, the passage of flame outwardly along th blad s pre nted.-

l assemblina the fuse, the assemble lade terminals and fusible link are inserted into the shell from the right in Fig. 1,-the closure head 9 seating against the end of th correp nd ng e rule n it b '10 occupyi g t e ferrule seats 3.

Th c ew c p ,4. sit n pplied to t t end o th h llyhsing s wed up nugly in p sition- The slotted Wash r nd he. sealing disk ar then slid over the other blade 6, the lugs 14 of he wa h r eng ging he seats 3.1 the sevent -ms fer u an he Wash r be ms On t e butme t 12 The sea ing di k i th shittedinte ts sealin pant es engasi a h notches 11.

he scr w Cap i then sl ep ew th blade 6 a d sewed down snealr 0n he f lelV-hen it is desired to disassemble the fuse,

the screw cap is first removed frorn the left, end of the tusc in Fig. 1 and the sealing diskh n sh fted int as r la e i Q-Iit e l Hated in Fig, 5 and th Wa he an d sk ar hen l ft d off the ade??- The o her screw cap s new emov d a the parts may then he lifted out-- It is evident from the foregoing that my i sievedirenewahlefuse is ofsimple an expensive construction and contains no parts likely to become worn in use or subject to breakage.

It is easily assembled and disassembled without requiring either skill or the use of tools.

The blade terminals are sealed against the escape of flame along the same and thus dan ger of fire is avoided.

The permanent attachment of the sealing disk to the slotted washer fa'cilitatesthe handling of the parts and prevents the loss or misplacement of the sealing disk.

What I desire to claim is 1. In a renewable fuse, the combination of a tubular body, a terminal blade provided with an abutment, a slotted washer arranged to be slipped down over the blade into engagement with said abutment, means for preventing relative rotation between the wasl'ier' and the body, a one-piece a-pertured sealing disk slidably secured to the face of the washer by a pin and slot connection and arranged to be slipped down over said blade with and to bear against the slotted washer, said disk and blade being provided with portions arranged to interengage, when the disk is shifted on said washer, to prevent relative longitudinal monementbetween said bladeand said disk, and means for clamping all of said elements in fixed assemblage.

2. In a renewable fuse, the combination of a tubular body, a terminal blade provided with an abutment and a restricted neck-outside of the latter, a slotted washer arranged to he slipped down over the blade into engag m it a d abu m t, mea r :p ve t ng at v a o etween he lo washer and the body, a one-piece apertured sealing disk slidably secured to the face of the washer by a pin and slotconnection and arranged to he slipped down over the blade with and to bear against said slotted washer and to be shifted relative to said slotted washer to engage about said restricted neck,

nd m a for mping said l men s i fixed assemblage.

3. a renewable fuse, the combination of a tubularv body, a terminal blade, said blade being pro id d With an abutm nt, a lo washer arranged to he slipped down on the blade and bear against said abutment, said abu m n sea i th S des f t l t in ai washer, means for preventing .relatilverota t e bet n he Was a d e b dyi o Piece answe e -l n d s a ly se u e to he face of t ashe y a n nand-slo connection and arranged to be slipped-down over the blade with and bear against said washer, said disk being arranged to be moved parallel with said washer to seal the endsof the slot of the latter, and means for clamping all o ai elements in fixed assemblage.

4. In a renewable fuse, thev oombinationof a tubular. body, a terminal blade. arrang to extend through the end of said body, said blade being provided with an abutment and a restricted neck adjacent to the abutment and at the outer side thereof, a slotted washer arranged to be slipped down over the blade to rest upon the abutment and close the end of the fuse body, and a sealing disk slidably attached by a pin and slot connection to the outer face of the slotted washer, said sealing disk being provided with an irregular aperture therethrough one portion of said aperture being of a size to receive said blade and another portion of the aperture being of a size to clasp said restricted neck whereby by moving said disk relative to said slotted Washer so that the first portion of the said aperture registers with the slot in said washer the washer and disk may be slipped in unison down over the blade and the disk may then he slid relative to said washer so that the second portion of its aperture may clasp the restricted neck of the blade, and means for 1(glanping the disk and Washer to the fuse Signed at New York, N. Y., this 19th day of March, 1928.

FREDERICK C. LAVARACK.

Images