US972362A - Fuse-supporting connection. - Google Patents

Description

E. L. GRAUEL. FUSE SUPPORTING CONNECTIOIE, APPLIGATION FILED was, 1910.

Patented 0st, 11, 1910.

' specification.

TED STATES ea EDWIN L. GBAUEL, OF TROY, NEW YORK, ASSIGNOR T0 TRGY TELEPI-IONE SPECIALTY COMPANY, OF TROY, NEW YORK, A COBPOEATIGN 01? NEW" YORK.

FUSE-SUPPORTING CDBlNECTIOI'Il.

Specification of Letters Patent.

Patented @ct. 111.1914).

Application filed February 8, 19 10. Serial No. 542,733.

To all whom ii may concern:

Be it known that I, EDWIN L. GRAUEL, a citizen of the United States, residing at Troy, county of Rensselaer, and State of New York, have invented certain new and useful Improvements in Fuse-Supporting Connections, of which the following is a specification.

The invention relates to such improvements and consists ofthe novel construction and combination of parts hereinafter described and subsequently claimed.

Reference may be had to the accompanying drawings, and the reference characters marked thereon, which form a part of this Similar characters refer to similar arts in the several figures therein.

The 0 ject of the invention is to provide a simple, cheaply constructed and easily operated supporting mechanism for an electricfuse which will insure a stable contact between the fuse and the conductors which it is intended to connect by the interposition of a. safety fuse.

The invention consists of an electric-fuse with metallic terminals in the form of screwthreaded lugs, one terminal being screwthreaded to the right and the other terminal to the left and a pair of yielding plate-like conductors, a portion of each conductor be ing thinner than the space between the screw-threads on the lugs. such thin port-ions being apertured. and the aperture-walls screw-threaded to receive and fit the threaded lugs, whereby the yieldiiig platelike conductors can be sprung apart to insert the ends of the lugs in the plate-apertures, and by turning the fuse the threaded lugs will enter the plate-apertures and draw the conductors into stable contact with metallic shoulders at the inner ends of the lugs. as

section.

I have ascertained that by employing plate-like conductors thinner at some portions than the space between the screwthreads on the fuse-terminals, such conductors can be apertureo and screw-threaded at such thin portions to receive mafia either fuse-terminal, whether screw-threaded to the right or to the left. Such an arrangement greatly facilitates the operation of changing fuses, or inserting a new fuse for one blown out, as it makes no difference which fuse-terminal is inserted in either of the terminal-rcceiving apertures. 4

When the plate-like conductor containing the apertures is thinner than the space between two threads, it is obvious that a whole thread, that is. a thread making a complete circuit of the aperture, cannot be inserted in the aperture-wall. therefore the threads of the screw-threaded lug inserted in such aperture will catch and coact with the aperturethread, whether the thread on the lug or terminal is cut to the right or the left.

By having the lugs provided one with a right and the other with a. left-hand thread, it is only necessary to rotate them by rotating the fuse-body to which they are con-. nected to insert such lugs in the threaded aperture and draw the plates and lug-shoulders .into solid and permanent contact without the use of detachable screw-threaded nuts adapted to be screwed onto the ends of the lugs which project through the plate-like conductors.

Referring to the drawings,-l igure 1 is a top-plan view of an insulator-block having a pair of electric-fuses suppoi'ted by electricconductors by means of my improved supporting connections, one of the fuse-bodies beingshown partly in central longitudinal Fig. 2 is a side elevation of the same. Fig. 3 is a plan view of the fuse-body detached from the conductors. Fig. 4c is a View similar to that shown in Fig. 2, with the fuse-body detached. Fig. 5 is a horizontal cross-section of one of the plate-like conductors, taken on the broken line 55 in Fig. 4, shown upon an enlarged scale. Fig. (l is a front elevation of one of the plate like conductors detached. showing a modified form of screw-receiving aperture. Fig. 7 is a Tvertical section of the same, taken on the broken line 7-7 in Fig. 6. v

1 is an insulator-block which may be made of porcelain or other insulatingmatea by the dotted line 19. It is obvious from an ably made of sheet-metal strips bent to form a right angle, are secured to the block as by the screws 3, and connected in any known manner with the line-conductors (not shown). The terminals, 4, similar to the terminals 2, are secured to the block as by screws, 5, and may be connected with installation-lines (not shown) in any known manner. The upper ends of the upright portions of the terminals 2 and 4 are apertured near their upper ends, and screw-threaded, as shown in Fig: 5, to receive the screw-' threaded lugs, 7 and 8, which constitute the fuse-terminals. The fuses are composed of a tubular insulating body-part, 10, provided at each end with a metallic cap, 12, shown octagonal in cross-sectional form for the purpose of receiving a wrench to rotate the same. The caps are provided at their outer ends with trunnions or lugs, 7 and 8.

The fusible wire, 15, passes through the body 10, as seen in Fig. 1, and into the lugs 7 and 8, which are made hollow to receive the ends of the fuse-wire, each end having an electric-connection with one of the lugs, which may be formed by a drop of solder inserted through the outer ends of the apertures in the lugs. The lug 8 is screwthreaded to the left, that is, in a direction which requires the lug to be turned toward the left hand of the person facing the screwtlireaded aperture, and the lug 7 is screwthreaded to the right, that is, in a direction which requires the lug to be turned toward the right hand of the person facing the screw-threaded aperture. It is obvious, therefore, that when the body 10, or the caps 12, are rotated in one direction, both the lugs will at the same time enter the screw-threaded apertures in the uprights 2 and 4, and when the fuse-body is turned in the opposite direction the lugs will be withdrawn from the u ri hts 2 and 4:.

P a: In Fig. 5, which is made on a large scale, is shown one of such screw-threaded apertures, 17, the screw-thread on the lower side of the aperture being represented by' the j' solid line 18, and the screw-thread on the upper side of the aperture being represented inspection of this Fig. 5 that the thread 18 does not make a complete circuit of the aperture,- thereby permitting the lug, screwthreaded either to the left, or the right, to be inserted therein by turning the same in the proper direction. r

I have -ascertained that when/ the platelike conductors are made of exceedingly thin plates, or when the screw-receiving apertures therein are countersunk, it is net necessary to insert a tap in such apertur 's' to produce threads for receiving the sciew-th eaded terminals of the fuse. T have 'shbwn i Figs.

and 7 such modified form of construction,

wherein the aperture 22is countersunk on each of the opposite sides of the plate, thereby torrning the beveled surfaces 23 and the extremely thin edge 24 surrounding the aperture. It is unnecessary to insert a screwthreading tap in such an aperture to adapt it to receive the right and left threaded fuseterminals. The threads on such terminals will themselves produce the necessary conformation of the aperture-walls to cause such walls to coact with the screw-threads on the fuse-terminals. Suchcoaction of the parts causes the yielding conductors to approach each other, or recede, as the fuse-body is turned either in one direction or the other, in the same manner that thicker aperturewalls would do if they had been previously 1 tapped and provided with screw-threads to correspond with the threads on the fuseterminals. The yielding conductor-plates 2, are preferably formed of resilient metal, and normally extend convergently upward, as shown in Fig. 3, with their upper ends a distance apart somewhat less than the total length of the fuse, includingthe end-lugs 7 and 8. The upper ends of the conductorplates thus require to be forced apart to permit the fuse to be introduced between them, and as soon as the lugs are brought opposite the respective apertures in-the plates, 2, the resilient force of the plates w ll cause the screw-threads on the lugs to quickly bite or grip the Walls of the aperture's'in the respective conductor-plates, and the farther said lugs are screwed into said apertures the greater will be the bite or grip of the screwthreads on the walls at thetop and bottom of the apertures, due to the fact that the plates are drawn toward each other to a constantly increasing degree of obliqueness. By reason of the normal convergence of the plates, the screw-threaded lugs are not only caused to grip the walls of the apertures more quickly, but will effectively grip such walls even after the apertures have become considerably worn and enlarged by wear.

\Vhat I claim as new and desire to secure by Letters Patent is- 1. The combination with a pair of electricfuse terminals consisting of metallic lugs, screw-threaded, one to the right and the other to the left; of a pair of yieldingly supported conductors apertured to receive. and'coac't with the threaded lugs, respectively, and form stable contacts.

ing'thin'ner than the space between the screwthreads on the lugs, such thin portions being apertured, and the aperture-walls threaded to receive and fit the threaded lugs.

3.-The combination with a \fuse ving oppositely screw-threaded terminals; of a. In testimony whereof, I have hereunto pan of convergently arranged ylehihng reslhset my hand tlns 3th day of February, 1910.

ent conductor-plates apertnred toreceive and T PDWIB L. FT.

coact wlth sand terrmnals, respegtlvely, and J XL J J supported wlth than apertured portlons nor- 'ltnessesz a nlally separated by n spnee less than the l. S. FREEMAN,

length of said fuse. \V. J. GORMAN.

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