US762824A - Fuse-plug. - Google Patents

Description

' fiverzf PATENTED JUNE 14, 1904. R. HUNDHAUSE-N. FUSE PLUG. APPLICATION FILED NOV.24,1899.

N0 MODEL.

UNITED STATES Patented June 14. 1904.

PATENT OEErcE.

RUDOLF HUNDHAUSEN, OF WILMERSDORF, GERMANY, ASSIGNOR TO SIEMENS 8: HALSKE ELECTRIC COMPANY OF AMERICA, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

FUSE-PLUG.

SPECIFICATION forming part of Let ers Pa e No. 762,824, dated June 14, 1904.

Application filed November 24, 1899. Serial No. 738,160. (No model.)

To all whom it may concern:

Be it known that I, RUDoLE HUNDHAUSEN, a subject of the Emperor of Germany, residing at I/Vilmersdorf, near Berlin, Germany, have invented a certain new and useful Improvement in Fuse=Plugs, of which the following is a full, clear, concise, and exact description, reference being had to the accompanying drawings, forming a part of this specification.

The present invention relates to improvements in fuse-plugs, more particularly to the interchangeable plugs for electric safety devices whose fuses are surrounded by an insulating body of cylindrical form having its electrodes on the end faces thereof.

It is the object of this invention to provide a fuse-plug which shall not be materially injured upon short-circuits and in which a compact and readily-manufactured construction is employed wherein the danger of the con tinuations of an arc is avoided.

I will explain my invention in detail by reference to the accompanying drawings, in

- which-- Figure 1 is an external View of a complete plug diagrammatically connected in circuit.

Fig. 2 is a vertical cross-section of the plug,

showing the fuses in their relation to the contact parts. Fig. 3 is a cross-section at right angles to that of Fig. 2 with the device bottom side up and one terminal plate removed. Fig. 4 is a top view with a terminal plate removed. Fig. 5 is a top view with the terminal plate in place. Fig. 6 is a horizontal section through the center of the plug on line 6 6 of Fig. 3. Fig. 7 is a sectional view on line 7 7 of Fig. 6.

Similar letters of reference refer to similar parts throughout the views.

The device which has been shown in the drawings to illustrate the invention comprises a cylindric structure A, consisting of outer and inner concentric cylinders b and 0. At the opposite ends ofthe structure A there are arranged walls 6 and e, which extend transversely across a portion of the space between the inner and outer cylinders c and b. The walls 6 and c are on opposite sides of the device. The wall 0 extends transversely across a portion of the space between the inner and outer cylinders at one end of the device, and the wall 6 extends across the other side of that space at the opposite end of the device. This gives the walls 6 and a a sector-like shape when viewed in plan, as shown in Fig. 4. The walls c and e are connected by walls in 20 which extend longitudinally of the device between the radial sides of the walls a and e, thus with the walls 0 and c dividing the space between the outer and inner cylinders 7) and 0 into two chambers h and if, which are open, respectively, at opposite ends of the device and closed at their other ends, as shown in Fig. 7 The walls w 01: are conveniently inclined from the axis of the cylinders, so that the chambers It and 7& flare at their open ends. Each of the walls in Q0 has a transverselyextending portion at its middle, and these portions in the two walls are provided with apertures (Z (Z On one side of the device the wall 10 is desirably formed so as to provide a space 0, Figs. 2 and 6, which communicates at its top and bottom with the chambers and 7&2.

The outer cylindric casing 7) is desirably constructed with indentations or recesses f, f f", f f and f which by their presence make the portions of the casing 7), forming their inner walls, very thin.

The transverse walls 0 and a are provided with openings d and (1*, forming openings through those walls into the chambers 7L2 and h, respectively, as shown in Fig. 3. A couple of fusess and are arranged in the chambers h and/r the fuse a being extended from the middle of the chamber it to the wall '20 and through the opening (Z therein into the chamber if and to the middle thereof, and the fuse 8 being extended from the middle of the cham ber It on the opposite side thereof to the wall 102 through the opening (Z therein and thence into and to the middle of the chamber l1? on the side opposite the fuse s. This arrangement of the fuses is shown in Figs. 2 and 4, the fuses in the chamber it being shown in the lower portions of both figures and in the chambers 7L and b ber if in dotted lines in the upper portion of Fig. 2. It will be remembered that in Fig. 2 the fuses are shown in full in the lower part of the figure, although in reality they would not appear, since the figure is a vertical section through the center of the device.

A couple of contacts a and a are connected with the fuses s and 8 the contact a being connected therewith at the meeting thereof in the chamber h and the contact a being connected at their junction in the chamber 73. The contacts a and a extend, respectively, through the openings or apertures d and d, as well shown in Fig. 3. The fuses s and s are therefore in parallel in the circuit.

The opposite ends of the device are provided with metallic contact-plates K and K respectively. These plates are fitted into suitable annular recesses formed for them at the opposite ends of the device and are provided with central circular openings and also with openings through which the contacts a and a can pass. The contacts a and (t are bent down over the contact-plates K and K as shown in Figs. 3 and 5.

The chambers h and b are substantially filled with a suitable dielectric n, such as talcum powder, except at their ends, where the fuses pass through the holes, which spaces are filled with masses 6 of gypsum or like material for securing a thorough sealing of the device. The contacts a and a are desirably secured in place in the apertures (Z and d by means of putty, Fig. 3.

As a preferred arrangementasupplemental fuse m of smaller capacity than fuses .s and s is provided and extended between the contacts a and a It is desirably arranged so as to pass through the space 0, and thereby .become exposed to outside view.

In the construction of thedevice the contacts a a are soldered to the fuses s, .9 and 121 when the contacts are outside of the cham- They are then inserted in these chambers and pushed through the apertures (Z and cl", after which the apertures and chambers are provided with putty, gypsum, and talcum powder, as before specified, and then the plates K and K are placed in position and the contacts a and a bent down and secured to them.

The device has the advantage that when the fuses s and s blow the entire rupture occurs inside of the device, and therefore no danger exists by reason of sparking or a continuation of the arc. If the eruptive power is great, the thin portions of the outer casing 5, forming the rear walls of the recesses f f &c., will become broken, thereby allowing the ejection of the dielectric contained in the two fuse-chambers. This explosion of the dielectric, however, willbe in such a direction that it will tend to extinguish or break the arc and will not permit its continuation. The presence of the supplemental fuse m makes it possible to observe from the outside whether or not the device has been operated and requires its fuses to be replaced.

The device is especially fitted for use in places where heavy discharges, due to short circuits, are possible by reason of the fact that the continuation of the arc is absolutely prevented. The device also has the advantage of simplicity and cheapness of construction.

What I claim as my invention is 1. In adevice of the class specified, the combination of interior and exterior casings arranged to provide a space between them, walls extended in said space so as to divide the same into two fuse-chambers, the said walls having small perforations for the fuses communicating with the fuse-chambers, fuses arranged in said chambers and extended through the perforations in said walls, means for sealing said chambers, and contacts connected with the fuses and extended outside of the device, substantially as set forth.

2. In a device of the class specified, the combination of the interior and exterior cylindric casings, longitudinally extending walls dividing the space between said casings into two chambers, the said walls being provided with small perforations communicating with the opposite chambers, fuses arranged in said chambers and extended through said apertures in the walls, means for sealing said chambers, and contacts connecting with the fuses and extended outside of the device, substantially as set forth.

3. In a device of the class specified, the combination with interior and exterior cylindric casings, of transverse walls extended across opposite ends of the space between said casings, longitudinally-arranged walls extending between said transverse walls so as, with said transverse walls, to divide the said annular space between the casings into two chambers, the said longitudinally-extending walls being provided with apertures for the fuses, fuses arranged in the chambers into which the said annular space is formed, and extended through the said apertures in said longitudinallyextending walls, insulating material in said chambers, metallic contactplates at the opposite ends of the casings forming closures for the space between the same, and contacts connected to the fuses and extended through said metallic plates, substantially as described.

a. In a device of the class specified, the combination with a casing affording a fuse-chamber, the said casing having a couple of small fuse-apertures, a main fuse arranged in said chamber, a supplemental fuse also arranged therein but extended through said apertures so as to be visible from the outside of the casing, means for sealing the chamber, and a contact connected with said fuses and extended to the exterior of the device, substantially as set forth.

5. In a device of the class specified, the combination with a casing provided with walls dividing it into a couple of fuse-chambers, the said casinghavingacouple of small fuse-apertures, main fuses arranged in said fuse-chambers, a supplemental fuse extended through said apertures so as to be visible from the outside of the device, means for sealing said chambers, and contacts connected with said fuses and extended to the outside of the device, substantially as described.

6. A'device of the class specified, comprising a tubular structure consisting of interior and exterior casings, transverse walls partly closing opposite sides of the opposite ends of the space between the casings and longitudinally-arranged walls extending between said transverse walls so as to divide the annular space between the casings into two chambers, the said longitudinal walls having small perforations communicating with the opposite chambers and the outer casing being provided with a couple of apertures communicating with its interior and exterior, and with recesses in its sides, fuses arranged in said chambers and extended between the same by way of the apertures in said longitudinally-arranged walls, a supplemental fuse also arranged in said chambers and extended through the apertures in said outer casing, contacts connected with said fuses and extended outwardly therefrom, a dielectric arranged within the chambers, and metallic plates secured to the opposite ends of the tubular structure and having apertures through which the said contacts extend, the contacts being connected with the said metallic plates, substantially as described.

7. In a device of the class specified, the combination with a tubular sealed structure providing the fuse-chamber, the said structure having a thick wall made thin in spots or pertions, fuses arranged in said chamber, and a dielectric also in said chamber, substantially as set forth.

8. In a device of the class specified, a tubular sealed structure providinga fuse-chamber, the said structure being made with recessed portions, reducing the thickness of its walls in spots, fuses arranged in said chamber, and a dielectric also arranged therein, substantially as described.

9. In an electric fuse or cut-out, the combination with an enveloped main fuse-wire and its casing, of an auxiliary or indicating fusewire within the chamber of said casing but having an indicating part extending to the outside of said casing.

10. In an electric fuse or cut-out, the combination with an enveloped main fuse-wire and its casing, of an auxiliary or indicating fusewire within the chamber of said casing, but having a part projecting through the casing to the outside thereof.

11. In an electric fuse or cut-out, the combination with an enveloped main fuse-wire and its casing, of an auxiliary or indicating fusewire within the chamber of said casing but having a part looped through the wall of the casing to the outside thereof.

12. In an electric fuse or cut-out, the combination with an enveloped fuse-wire and its casing, of an auxiliary or indicating fuse-.wire within the chamber of said casing, but laced through openings in the wall of the casing so that a part thereof lies on the outside of the casing.

13. In an electric fuse orcut-out, a casing, a fuse-wire within the casing, but having a part between its ends extending to the outside thereof, and a heat-dissipating filling within the casing making contact with that part of the fuse-wire which lies within the casing.

1 1. In an electric fuse or cut-out, a casing, a fuse-wire within the casing, but laced through openings in the wall thereof so that part of the fuse-wire lies outside of the casing, and a heatdissipating filling within the casing making contact with that part of the fuse-wire which lies within the casing.

15. In a safety-fuse, the combination with a case and means mechanically closing the ends thereof, of a fusible strip extending through the case, terminals for the said fuse and an indicator-wire partially within the chamber of said case and partially exposed upon the outer surface of the case with its ends electrically connected with the fusible strip.

16. In a safety-fuse, the combination with a case, its ends and terminals, of a fusible strip extending through the case and electrically connected with the ends and terminals and an indicator-wire partially within the chamber of said case and partially exposed upon the outer surface of the case with its ends electrically connectedwith the fusible strip.

17, In a safety-fuse, the combination with a case and means mechanically closing the ends thereof, of a fusible strip extending tl'n'ough the case, a non-conducting filling material in the case surrounding the fusible strip, terminals for the said fusible strip, and an indicatorwire partially within the chamber of said ease and partially exposed upon the outer surface of the ease with its endselectricallyconnected with the fusible strip.

18. In an electric fuse or cut-out, the combination with a main fuse-wire and its inclosing casing, of an auxiliary or indicating fuse-wire within the inner surface of the shell of said casing but having a part extending to the outside of said casing.

In witness whereof I hereunto subscribe my name this 2d day of November, A. D. 1899.

RUDOLF HUN DHAUSEN.

itnesses:

W OLDEMAR HAUPT, HENRY Hasrnn.

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