US1270272A - Fuse. - Google Patents

Description

L. w. oowmEs & R. C. PATTON.

FUSE.

APPLI'CATION FILED oc'r.12,191s.

PatefitedJune 25, 1918.

"M M a 0L0 MW 0 AF W W am UNITED STATES Pfifi ifrili iilf LOUZIS 'W. DOWNES AND EALPH CLIFTON PATTQIQ, 313' PREFVIDEWQE, RHGDE ISLAND,

ASEIGNORS TO D 8: W. FUSE CGMPANY, OF ERGVIDEKQJE, RHQZUE PQBATIDN 01F RHUIDE ISLAND.

mien.

Anylication filed @etc'nez 12, 1918.

To all wkom izfmayconcem Be it known that We, LOUIS VI. DOWNES and RALPH CLIFTON PATTQN, citizens of iihe United States, and residents of the city of 5 Providence, vin ithe ccunty of Providence and State of Rhode Island, have invents certain new and. useful lmpi'cvenicn'ts in Fuses, which the follewing is a specifics.-

extinguish the the auxiliary ink finally A 'fiurthei' cbjeci: 07f enticn i 1 provide an electric fuse Wing fusible link i. cylindrical shape an i to .c'vicle en air chamber for said link ifcnncu both on fihe inside and on the outside 0% 'fhe cyli nler for a portion of its length.

It is found in practice ihzu'; when the mm rent slowly creeps up beyond the maximum carrying capacity 0f the fuse; the link begins to oxidize on its surface, and if mein- .aineci at a ci'i ical temper? 'ure just below his mel'b ng r l l coating 0- cxid cf en iJcf/Oi l I support the meta} Within it even when has become melied and when a sf suppressing materie lies gig-"e I conic-(l link '1: serves support L n n and prevent she rupture W1 i-wlse occur.

order to obviate this serious diliiculcy eventing the rupture of she link 1* time, we nave prev; e he in ale and nits link Y nch sn 7' are p i i M'- eu. to egisiei one wiiih the other so film's h the inside and outside wells of the link soacc c ciy un uppoiteih I ei ht of the n'ieqni will he slain of of because slain has nci ;h in itself to 4 metal.

encther eds -e cf the space enera'lly einplo gcei e securc=- by Specificaticn of ile'tiiers Eat n-L Serial high temperatinesv This has been termed the Nei'nst eiifect, an example of Whichmay be seen in the well-known 'hernst lamp.

The air chambers divide the filling mate- Iilll end so prevent h ghly heated layers of the same from serving as a conductor to reestablish the circuit after the link is blown. The desirnbie effects secured by the air chambers aid in the quiet operation of any fuse, QIBiJaltlCllllflY valuable when used in a main fuse connected electrically in peravllcl with an auxiliary fuse.

Vfih these and other objects in View, the invention co. cf certain novel features 01 "l he more fully de- W i iznzly pointed cue in the crewing's ctiional side elevation of a n LUSH: showing; an auxiliary fuse mount- 2- 1s a side eievnticn partly in section fuse with s :ubnl n1 fuse link havch inber formed about it.

- an 83141 View of the construe e sectional. end View on line 2 through one row of metal reticnnl side elevation of a in link belng provided ecznnoun f icle.

n beinn' which heads are in 1e contact plates 12 exeui; through the end caps 13 of the a 'zn'rn supported on miin inner chamber 16 is formed by proa pair disks 20 and 21 which are i Spllfifill upzirt relation by one or more If s 22, ouch of which pins is shouldered us :it 23, the reduced portion extending irough openings in the mic-u disks.

The Walls of the inner chumber are preferably arranged in line with those of the outer chuzuluu' so tluit the air chambers on both. sides of the link will register.

n order to somewhat Weaken that portion of the Wull of the tubular link, which lies Within the air chamber, We hure formed u. plurality of srnull holes 2 1': through the body of the linl; udiecent one of the chzuuber WilllS and a similar row of holes 25 adjacent the opposite Well of the chamber,thereby weulrening the linlr between these holes so as to insure 1ts rupturing within the chamber.

A filling of are suppressing materiel is pressed both into the ii side of the tubular link and also about the outside of the some, completely filling the casing except the sec: tions between the wells of the inner and outer chan'ibcrs.

By this construction, it will be observed that the walls of the tubular linlt are entirely uusugported within the chambers, whereby when fused, the metal will drop 21nd disperse breaking the eircuit at this point.

lt is found in practice that the use of an.

air chamber in a. compound. fuse greatly increases the efiiciency of such a fuse particularly in hi h current and high voltage circuits. l r" drawings illustrates cartridge form of compound fuse in which or more auxiliary fuses 2G greater electrical resistance are connected elcctricelly in parallel with the main fuse.

lit has been found in large compound fuses, particularly those having u voltage of sin hundred or more, that when an air space is not employed ulirout the main link, the are sometimes reestziblishes itse f in the main fuse, the auxiliary link is runtured. T his has been found to be due to the feet that either the skin of metallic oxld has not been entirely broken, or else the illing of are suppressing mute-rial about the main link has become a conductor due to its high temperature W hen the air chtunber is employed in e. compound fuse, the main link ruptures with in the chamber upon the passage of un ere cessive current Without the fornwtiou of u. violent ere because i this main linl; melts the peter tl ucrcss the gap forlned'in it very l ue to the fact that the main link nected in nerullel with shunt circuit in the form un auxthe smell i iliury link. he formed at the breei n entirely tingulshed link opens the circuit. It is then impossible for the circuit to reestablish itself through the main fuse.

in some insluuces instead of mounting the auxiliary fuse in u SCPLlilliQ casing and on the oulside of the main casing, es illustrated in Figs. 1, '2 and S, We construct the auxiliary element in a coil or helicul form. L? and mount it in the some casing with the main fuse 10 as illustrated inFig". 5 but any cooperating arrangement of main and ens:- iliery fuse links adopted to operate in connection with en ,uir chamber is intended to full Within the scope of this invention.

Our present invention lies first, in the provision. of u compound fuse having fuse links ofeuy shape and providing an air chamber about the main fuse link for too purpose above described; second, to provide at fuse having a tubular fuse link With en air charm leer, both on the outside and on the inside of the link; and third, the provision of a compound fuse having a main link in tubu- .ler form, said main link having an air chumber both on its inside and on its outside, said inein fuse link being arranged to Work in conjunction with an auxiliary fuse linl; of any shape or form and connected with it in. parallel.

Having thus described one illustrative; mnbodinient of our invention, We desire it to be understood that the details of construction may be varied Without departing from the spirit of the invention, the scope which is defined by the appended claims We claim:

El. in en electric fuse, the couiloineticui. a main fuse link and an auxiliary fuse liulr connected together electrically in parallel, on air chamber formed about said niuin limit for :1 portion of its length, said auxiliury fuse being of a capacity sufficient to prevent the drawing out of on are Within the air chamber upon the melting of the muin fuse link before the auxiliary link finally opens the circuit.

Q. In an electric fuse, a cylindrical fuse link, a filling of are suppressing material about said linlr and an stir chamber formed both inside and outside of said cylinder for, a portion of the length of the fuse.

3. ln an electric fuse, e cylindrical fuse link, a filling of are suppressing material in said fuse, and an air drum formed both on ti e outside and on the inside of said cylinder d drums registering with each other.

4. ln en clec tric if use, a cylindrical fuse linlr, an air drum formedon theoutside of said link, en air drum formed on the inside of seid linlr, said drums registeri with each b other, and a filling of are suppressing; mate. rral about sand, drums.

5. ln an clectri fuse, a casing, cylin .ri-

ce l fuse linlr mounted in send casing, an e lie llllli chamber formed on the inside and about the outside of said link, the walls of said link being weakened between said chambers.

6. In an electric fuse, an outer casing, a cylindrical fuse link mounted in said casing, air drums having two side walls formed both on the outside and on. the inside of said cylinder, spacers for separating and supporting said Walls, and a filling of arc suppressing material paeked against both of said walls.

7. In an electric fuse, a casing, a cylindrical fuse link in said casing, a filling of are sup ressing material about said link, an air chamber formed on both the inside and outtures in presence of two witnesses LOUIS W. DOWNES. RALPH CLIFTON PATTON. Witnesses:

, GEORGE W. STEERE,

P. O. BAKER.

Images