US1393281A - Electric fuse - Google Patents

Description

F. E. VVILLEY.

ELECTRIC FUSE.

AVPPUCAUON mem Nov. 15` um.

o UNITED STATES PATE NT OFFICE..

FRANK E. WILLEY, OF CLAREMONT, NEW HAMPSHIRE, ASSIGNOR TO SULLIVAN MACHINERY COMPANY, CORPORATION 0F MASSACHUSETTS.

ELECTRIC FUSE.

To all 'whom t may concern.'

Be it known that I, FRANK E. WILLEY, a citizen of the United States, residing at Claremont, in the county of Sullivan and4v proved fuse in which the parts are readily separable and wherein the fuse carrying element forms a unit which, while normally held against longitudinal: or rotary movement relative to its casing, may be readily removed therefrom when desired. 'A further object of my invention is to provide an improved fuse wherein the fusible element is efi'ectually inclosed in such a manner that the rupture thereof occurs between relatively close walls of insulating material, and wherein the interior of the fuse casing is also preferably automatically cleaned by the removal of the fuse carrying element therefrom. These and other objects of my improved' construction will, however, hereinafter more fully appear.

In the accompanying drawings, I have, for purposes of illustration, shown one embodiment which my invention may assume in ractice.

Figure 1 is a longitudinal horizontal sectional view of the fuse carrying element and casing carried in its siipports.

Fig-2 is a longitudinal vertical sectional view of the fuse casing and removable fuse carrying element when separated.

Fig. 3 is a side elevation of the fuse carryingelement.

4 ig. 4 is a transverse sectional view on line 4.-,4 of Fig. 1.

Fig. 5 is, a transverse sectional view on line 5 5 of Fig. 2.

In the illustrative construction, I have shown the fuse carried in suitable openended socket members 1 and 2, lwhich may be ofan well. known con-struction, preferably resllient, and are preferably; formed of conducting material and connected to the line as indicated in dotted lines in Fig. 1. In these members 1 and 2, the end members y Specication of Letters Patent.

Patented Oct. 11, 1921.

Application led November 16, l1916. Serial No. 131,690.

3 and 4 are disposed, these members 3 and 4 being preferably cylindrical and formed of conducting material in the form of caps adapted to make velectrical contact with the sockets, and one of these members, as for instance the member 4, being connected to a fuse carrying element 5, hereinafter described, andvremovable therewith, while the other member, as for instance the member 3, is connected to afuse casing 6.

In my improvedconstruction, it will be noted that this casing 6 is cylindrical in form and preferably made of insulating materia-l having the conducting member 3 litting over and preferably threadedon one end of the same at 7, and also preferably rigidly connected thereto as by a pin 8l in vorder to prevent relative rotation. At its opposite end, it will be noted that this easing' 6 is provided with a plurality of longitudinally extending notches 9. These notches 9 are, as shown, adapted to receive the ends of a transversely disposed pin 10 p carriedA on thefmember 4,' the construction of the latter preferably being such that the end of the casing 6 may extend into suitable annular grooves 11 in this member so that when the latter is moved toward the casing the pin 10 may seatin the notches 9 and the member 4 thus be locked against rotation with respect to the lcasing 6.

As shown, the fuse carrying element is rigidly connected to the member 4 and comrises a longitudinally extending insulating base 12 of substantially seml-cylindrieal cross section throughout its length and adapted to fit into and fill approximately one-half of the casing 6. As shown, the -opposite ends of this base 12 are connected by any Suitable means, as by screws or pins 13, 14, with inwardly projecting extensions 15, 16, respectively, on a conducting end member 17 of cylindrical cross section, slidable within the casing 6, and on the member 4.

upwardly projecting extension or bridge 21 carried by the base 12 and integrally united therewith or connected thereto by suitable connecting means such as;pins 22. In the form of my invention shown, this portion 21 extends transversely across the casing at substantially the center thereof and likewise substantially fills one-half of the bore of the casing 6 to divide the casing into two compartments 0r blowing spaces, leaving only a small or restricted passage 23 through which the bowed middle portion of the fusible element 18 extends, the ends of this fusible element bein provided with oppositely disposed notc es 24 on each side of the member 21, leaving a restricted fuse section which is more easily burned than the body of the fuse.

In the use of my'improved fuse, the fuse carrying element comprising the members 17, 12, 21, and 4:, with the fuse 18 connected thereto, isv connected to the end member 3 of the casing 6 by means of a suitable removable connection including a screw or bolt 25,

preferably provided with apknob 26 to en able the same to be readily adjusted, and

passing through a hole 27 of larger diameter in the end member 3 into engagement with a suitable threaded recess 28 in the end member 17. Thus, it will be noted that by simply inserting the fuse carryin element in the casing with the pin 10 in registry with the slots 9, the casing and fuse carrying element may be rigidly connected together by threading in the bolt or screw 25, and that both the fuse carrying element and the casing are thus locked securely against independent rotation.

Obviously, when it fis desired to remove the fuse carr ing element, this may also be readily done by simply removing the bolt or screw 25, whereupon the entire fuse .carrying element may be bodily withdrawn from its casing, the member 17 thereon then acting automatically to clean the inner surface of the casing 6. .Obviously, when the fuse carrying element has been thus withdrawn, the 'same will form a separate unit which may be readily handled without any danger of breakage, and one inwhich'the process of substituting a newA fuse for the burned out fuse may be readily carried out by simply pulling out the severed ends ofthe burned out fuse and projecting the ends of the new fuse under the screws 19, 20, the latterbeing loosened or tightened, as necessary.

In the use of my improved construction, it will also be noted that, due to the provision of-the extension 21 on the base 12, the chamber in which the fuse is carried is restricted at a point substantially midway between the ends of the fuse, and between the weakened portions thereof where the latter is apt to be severed, the space above the base 12th us being divided into two compartments or blow-y ing spaces in such a manner that the injurious eilects of the burning of the fuse are thereby minimized. One of the restricted portions will blow first, heating and expanding the air inv its compartment to such an extent that the section of the fuse resting on the bridge is immediately blown into the opposite compartment, and so lengthening the arc. The bridge, prevents molten pieces of fuse from assisting in maintaining an arc, and since the arc tends to travel in straight lines but is prevented from passing in a straight line from contact to contact by the bridge, the arcing will stop. These and other advantages of my improved construction will, however, be clearly apparent t0 those skilled in the art.

While I have in this application specifically described one embodiment which my invention may assume in practice, it should be understood that the form thereof shown herein is used only for purposes of illustration, and that the invention may be modiied and embodied in other forms without departing from its spirit, it being my intention to include all such modifications within the scope of the appended claims.

What I claim as new and desire tosecure by Letters Patent i`s:-

1. In` an electric fuse, a fuse casing, a unitary fuse carrying element reciprocable therein, and means on one end of said eleunitary fuse carrying` element reciprocable therein, a fuse carriedon said element, and means on'said element in spaced relation to the fuse for cleaning the inner wall of said casin adjacent said 4fuse as said element is reciprocated therein.

3. In an electric fuse, a fuse casing, aunitary fuse carrying element .reciprocable therein having a cleaning portion engaging the inner periphery thereof and a portion extending substantially across a part of the inside of said casing, and a fuse extending over said last mentioned portion and having downwardly extending ends connected to said element.

4:. In an electric' fuse,v a fuse casing, a unitary fusev carrying element reciprocable therein having a cleaning portion engaging the inner periphe thereof and atransversely disposed portion forming a bridge substantially filling a part of said casing, and a fuse on said element extending between said last mentioned portion and said casing.

5. n an electric fuse, a fuse casing, a unitary fuse carrying element reciprocable therein, a fuse carried on one side of said element, means on said element for scraping the adjacentwall of said casing as the element is withdrawn therefrom, and means for clamping said fuse carrying element to said casing.

6. In an electric fuse, a casing, a fuse carrying element reciprocable therein comprising a base having one end of the same cross section as the interior of said casing and' having-an upstanding bridge betweenl its ends, and a fuse connected to said fuse car? rying element at its opposite end and eX- tended over said bridge.

7. In an electric fuse, a casing,'a fuse carrying element reciprocab e therein comprising a base of similar cross section to a portion of a transverse section of the in'- terior of said casing and having a transversely disposed bridge thereon filling a sub# stantial part of the remaining cross section of a part of said casing, a fuse connected to said fuse carrying element and extending over said bridge, and a combined casing cleaning and conducting element connected to one end of said fuse. j

8. In an electric fuse, a casing, a fuse carrying element reciprocable therein and comprising a base having a transversely disposed bridge thereon filling a substantial part of' the cross section of said casing, a4

fuse connected to said fuse carrying element and extending over said bridge, a. cleaning member on said base slidably engaging the interior of said casing as said base is reciprocated, and means for connect-v ing said fuse carrying element to said casing.

9.` In an electric fuse, a casing, a fuse carrying element reciprocable therein and comprising a base having a transversely disposed bridge thereon filling a-substantial part of the cross-section ofrsaid casingga fuse connected to lsaid fuse carrying element and extending over. said bridge, a casing cleaning member reciprocable with said base, means for connecting said fuse carrying element to said casing, and means for locking said casing and fuse carrying element against relative rotation.

10. In combination, an insulating fuse casing having a conducting end member adapted to coperate with a socket member, al unitary i fuse carrying element disposed in said casing and reciprocable therein, a fuse thereon, means on said fuse carrying element whereby said fuse may be renewed or replaced, said fuse carrying element having a. conducting end member adapted to coperate with a second socket member, and a member removable from the exterior of said casing for connecting together said casing and fuse carrying element, said fuse carrying element being constructed and arranged to expose said means whereby the fuse element may be renewed or replaced upon removal of said cable therein and having a conducting endmemberfadapted to coperate with another socket member, a fuse on said fuse carrying element, means on said fuse carrying element whereby said fuse may be renewed or replaced, means for clamping together said fuse casing and said fuse carrying element, and means for locking said fuse casing and said fuse carrying element against relative rotation.

12. Inv an electric fuse, a casing having closed ends, a unitary fuse carrying element reciprocable longitudinally thereof, said element-comprising a member fitting the interior o'fsaid casing, and a fuse carrying member secured to said first mentioned member and disposed within the confines thereof whereby a scraping edge is provided at the periphery of said first mentioned member.

13. In an electric fuse, a casing, a fuse carrying element reciprocable therein comprising a base of less cross sectional area than the internal area of the casing, and having a bridge member secured thereto and filling a substantial part of the remaining cross section of said casing at a point between its ends, and a fuse connected to said fuse carrying element and extending over said bridge.

14. In combination, an insulating fuse casing, a conducting member secured to one end thereof and adapted to coperate with a socket member, a fuse carrying element reciprocable in said casing and comprising a pair of conducting members fitting snugly the bore of said casing, and an intermediate fuse carrying member of less cross sectional area than said casing, one of said last mentioned conducting members being adapted to contacbwith the conducting member secured to the end of the fuse casing, and the other thereof being provided with a concentrically arranged sleeve adapted to coperate with a second conducting socket member.

15. In an] electric fuse, a casing, a 'fuse carrying element reciprocable therein comprising a base of substantially semi-circular cross section, the arcuate wall of said base being disposed concentrically with the wall of said casing, a transversely disposed bridge on said base filling a substantial portion of the remaining cross section of said casing but of less length than said fusecarrying element whereby spatially separated chambers are formed on opposite sides of said bridge, a fuse connected to said fuse carrying element and extending over said bridge, and a combined casingcleaning and conducting @Mmmm cfmneced. to one end said fus@ cmzyiug dement 1G. En am @Remis Emsa, 'u casing, contac: mex'nbars disposed. at the @nds hereof, and a fue@ cmlying membersposed in said and 'mvng @L matlc scmping membe? mmlmmjgf in commet with one of sal Qommit members.

l?. En an eectric fus, :l casing? contmc members disposed at the @ms thereof, and l0 fuse carrying member 'ecprocable in said casing; and having at its inner and a com bined casing scraping and Contuc'; menubar.

lin testimony whereof I a'ix my signature.

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