US1788769A - Renewable fuse - Google Patents

Description

Jan, 13, 1931. F, c, LA A 1,788,769

RENEWABLE FUSE F iled March 23, 1928 INVENTOR Patented Jan. 13,1931

UNITED STATES,

PATENT-5,OFFICE FRANK 0. .LA MAR, or NEW YOBK,,1\T. Y., ASSIGNOR TO. GREAT WESTERN FUSE COM- rANYmF PITTSBURGH, PENNSYLVANIA, A CORPORATION on DELAWARE V RENEWABLE Fuss Applicationfiled March 23,1928. Serial mania.

The purpose which I have in view is the provisionof a novel renewable fuse structure which is of simple construction, 'yet I 'cated' at 6, hasfiXe-dly mounted thereon the circular metal closure head 8 which, when the'parts are in place, closes the outer end of'the corresponding ferrule 2.

rugged and durable; which may bereadily assembled, disassembled and renewed by unskilled persons; which is efiicient in operation, and which has its ends efficientlysealed v against the outward travel of flames. along the terminal blades. w In the accompanying'drawings, wherein I have illustrated the best embodiment of the principles of my invention now known to me, Fig. 1 is a longitudinal section ofthe fuse taken on line l1in Fig. 3. I Fig. 2 is a broken elevation of the left end of the fuse shown in Fig. 1, the fuse being turned on its longitudinal axis ninety degrees from its .position in Fig.1 and the screw cap being shown in diametric sectionv Fig. 3 is an end view of the fuse looking from the left in FigsJl and 2.

Fig. 4 is an elevation showing the terminal blades and the fusible link assembled together. 3

Fig. 5 is an inner end view of the left hand terminal blade in Figs. 1 and 4.

Fig. 6 is an inner face view of the slotted anchoring washer.

, Fig. 7 is an end View of one of the two ferrules which are preferably identical in structure. g

Fig.8 is an inner end viewof the right hand terminal blade in'Figs. 1 and 4. 7

Referring to the drawings, 1 indicates the tubular shell of insulating material,

such as fibre. V I

At each end said shell has mounted thereona metal ferrule 2, the same being held fixedly to the shell as by threadedengagement'and riveting.

The outer ends of said ferrules 2 are recessed at two opposite points to form the seats 3. i

The outer ends of the ferrules are ex teriorly threaded to receive the annular metal screw caps 4.

The shell land the ferrules '2'form the tubular body of the fuse.

5 and 6 indicate the two metal terminal blades to the inner'ends of which are detachably connected the ends of the fusible link'7L V One of the terminal blades, the one indi- Said head is provided on its inner face ends engage the seats 3 in the end of the ferrule 2 and thus prevent the head and terminal blade from rotating relative to the fuse body.

Outside, of the closure head 8 the sides'of the blade 6 are notched as at 10 to provide a somewhatreduced neck in the blade.

The screw cap 4, two of which are used,

' one on each end of the fuse body is provided with an annular inwardly extending flange '11 at its outer end which, when the cap is screwed down snugly in place,clamps the closure-head 8 rigidly, on the end of the fuse body.

By providing the flange of the screw cap with opposed notches 12, the screw cap when turned int othe proper position may be slipped down over the blade 6' until its flange fl'conies opposite the notches 10 of the blade,

thus rendering the cap rotatablerelative to the blade for tightening on the fuse body.

By notching the terminal blade and the flange of the screw cap I am enabled to employ a wider clamping flange 11 and thus obtaina better compression on the closure head 8.

The disk 13 is so positioned on the terminal blade 5 that when the parts are in position,'the anchoring washer 14 may be slipped between the disk and the corresponding end of the fuse body. The anchoring washer is circular and of such diameter that it closes the end of the'fuse body when in place against the end of the corresponding ferrule.

The washer 14 is provided with a diametrically disposed slot 15 open at one end to provide clearance for the terminal blade 5 as the washer 14 is slid laterally into position.

The washer 14 is provided with a transversely disposed rib 16 on its inner face whose ends engage the seats 3 in theferrule 2 when the washer is in position.

Outside of the disk 13-the terminal blade 5 is notched at its opposite edgesas -at-17, thus providing a somewhat restricted neck in the blade between the notches. i

The corresponding screw cap {1, with its notches 12- registering with the edges of the terminal blade 5, is now slipped down over the latter until its flange 11 is opposite the notches 17. The cap is then screwed-snugly down on the end of the fuse body, clamping the disk 13 snugly down on the washer l4-and thus sealing the edges of the slot 15 against the escape of flames outwardly along the blade. clamped tightly onto the'end of the fuse body.

' To assemble the fuse, the terminal blades are first attached to the ends of the fusible link and the terminal blade 5 is inserted into therightend of the fuse body in Fig. l and pushed through the same until the closure head 8 rests against the end of the fuse body with its ribs 9 engaging the ferrule seats 3.

The corresponding cap 4 is then slid down over the terminal blade 6 and screwed snugly in place. I

The anchoring washer is then slid into place between the disk 13 and the end of the fuse body with its rib 16 engaging the ferrule seats 3.

The corresponding cap 4 is then slid down over the terminal blade 5 and then screwed snugly in place.

To disassemble the fuse, the last mentioned cap 4 is first unscrewed and its notches 12 brought into registration with the edges of the terminal blade 5 and then lifted off the latter. i

The anchoring washer 14 is slid from between the end of the fuse body and the disk 13.

The other cap 4 is then removed from the other end of the fuse body, and the parts are thus released.

It is evident from the foregoing that my improved fuse has its ends efficiently sealed against the outward travel of the flames along tlie blades.

It is simple and inexpensive of construction, containing a minimum number of parts. Furthermore it may be quickly and readily assembled, disassembled and renewed. 'i

lVha-t I desire to claim is 1. Ina renewable fuse,the combination of a were s b dy a ermin l b d a The washer 14 is thus also ranged toextend through the end of said body, a disk fixedly mounted on said terminal blade and passable with said terminal blade through the fuse body, an anchoring washer having a dian'ietrically disposed slot to provide clearance for the terminal blade arranged to'be slid laterally in place between the end of the fuse body and the disk, said washer and fuse body having interengaging portions to prevent rotary motion of the washer relative to the fuse body, and a cap screwed on the end of the fuse body, said'cap having an inwardly extending annular flange which fits down in flat surface contact against the outer face of the disk, thus clamping the disk snugly against the washer and'the washer snugly against the end of the fuse, the bearing on the cap on the fixed washer being in a line parallel with the axis of the fuse.

2. In a renewable fuse, the combination of a tubular fuse body, a terminal blade arranged to extend through the end of said body, a disk fixedly mounted on said terminal blade and passable with said terminal blade through the fuse body, an anchoring washer having a diametrically disposed slotto provide clearance for the terminal blade arranged to be slid laterally in place between the end of the fuse body and the disk, said washer and fuse body having intcrengaging portions to prevent rotary motion of the washer reative to the fuse body, anda cap screwed on the end of the fuse body, said cap having an inwardly extending annular flange, the bore of said flange being of too small diameter to normally pass down over the blade but said flange being notched out at opposite points so that when turned into proper position the cap may be slipped down over the blade and the blade having a neck portion of reduced width adjacent to the disk to clear the flange of the cap and permit the cap to be screwed up on the end of the fuse body, thereby clamping the disk snugly against the washer and also clamping the washer snugly against the fuse body, the bearing of the cap on the fixed washer being in a line parallel with the axis of the fuse.

Signed at New York, N. Y. this 19th day of March, 1928'.

' I! FRANK C. LA MAR.

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