US1833652A - Multiple electrical fuse - Google Patents

Description

w. J. MANNING MULTIPLE ELECTRICAL FUSE Nov. 24, 1931,

Filed June 24 n f4? z .1 w M v u .7 1 r a JV 5 J Patented Nov. 24, 1931 PATENT OFFICE -W'ILLIAM OSEPH MANNING, F PHILADELPHIA, PENNSYLVANIA MULTIPLE ELECTRICAL FUSE Application filed June 24,

As hereinafter described,my invention is applicable to structures of the rotary screw plug type, adapted to fit a standard incandescent lamp socket, having two terminals 5 like an ordinary incandescent lamp bulb, and includinga rotaryfusible metal plate with a circular series of members adapted to be turned to successively bridge the gap between P said terminals. Ordinarily, fuses of that type are so constructed and arranged that when the series of fuse members have been successively fused, the entire structure must be discarded. Therefore, it is the object and effect of my invention .to provide such a fuse structure wherein the fuse element may be readily removed and replaced byanother similar element at minimum cost and without loss. of the remainder of the structure.

My invention includes the various novel features of construction and arrangement hereinafter more definitely specified.

In said. drawings: Fig. I is an axial end elevation of a fuse structure conveniently embodying my invention. Fig. II is a side elevation of thestructure shown in Fig. I.

-Fig. III is an inside. elevation of the rotatable cap, of which the outside is shown in Fig. I. Fig. IV is alongitudinal, diametrical, sectional view of said structure shown igs i Fi 1 and II. Fig. V is an outer face elevation of the rotary disk which carries the fusible element in said structure. Fig. VI is an edge elevationof said disk shown in .Fig. V. Fig. VII is an inner face elevation .of said disk shown in Figs. V and VI VIII.is a view similarto Fig. VII, but show- .ing a modified form of fusible element. Fig. IX is a fragmentary elevation of the rotary screw plug indicated in FigsJII and IV showing interrupted screw meansfor clamping the fusible member in adjusted position in said plug.

In said figures; the bodyl isformed of dielectric material such asporcelain, bakelite, or other material which may be molded. Saidbody 1 carries the metallic contact screw 2 having the electric terminal 3 electrically connected therewith, and having its contact end 4'terminating in eccentric relation with the axis of rotation of said screw. Said body 1929 Serial No. 373,335.

1 also has the metallic contact ring 6 in coaxlal relation therewith and electrically con 'nected with the terminal 7, the end 8 of which terminates in the same plane as the end 4 of the terminal 3. Said contact 6 and its terminal -7 are held in rigid relation with said body 1' by the tubular rivet 9. Said contacts 2 and 6, and their respective terminals 3 and '7, are insulated from each other by the ring plurality of radial members 16, each adapted to successively bridge said terminal ends 4 and 8, in respectively different positions of rotation of said disk. Said fuse element 14 is connected with the rotary disk 13 and is disr carded therewith. Y

' The rotarycap 18 is fitted to revolve on said body-1, andadapted to engage said disk'13 to turn with said cap; said cap having the coaxial opening 19 fitted to the coaxial projection 20 of said disk, said opening 19 and projection 2O conveniently including a circular series of six points, respectively coinciding with said radial members 16 so that the latter are visible thru said cap opening 19 and the C transparent material of said disk 13. I find it convenient to provide said disk 13 with recesses 22, which are slightly undercut, so as to securely hold the fusible plate 14 and its radial members 16, when said plate is pressed therein; said members being initially concavo convex, as indicated by the dotted line in Fig. VI.

I find it convenient to provide means adapted to detachably connect said body 1 and cap 18 so that said cap may be removed and replaced to successively release and hold such disks 13, in cooperative relation with said electric terminals. Such means may include a circular series of detent notches 24 in the outwardly projecting circumferential flange 25 on said body 1, forming sectors of an interrupted female screw thread on said body and circular series of inwardly pressed detent springs 26 on said cap 18. Said springs 26 form sectors of an interrupted male screw thread on said cap. Said flange 25 is conically tapered as indicated in Fig. IV and the inner faces of said detent springs 26 are similarly inclined, so that the resilience of said springs 26 not only tends to hold the cap 18 and disk 18 in any rotary position to which they may be turned, with said springs 26 in registry with respective notches 24:, but the inclination of said springs 26 and flange 25 causes said cap 18 to be stressed axially toward Laid body 1, to resiliently press said fusible members 14 in good contact with the ends 4 and 8 of said terminals 3 and 7. Moreover, the provision of the coordinated sectoral screw thread members aforesaid permits said cap to be removed and replaced, by a fraction of a revolution thereof, to successively release and hold such disks 13, which, as shown, are imperforate and serve to seclude the fusible plates 14 from the outer atmosphere.

Although, as indicated in Fig. VII, the radial fuse members 16 extend outwardly from an axial portion of the plate 1 1; they may be otherwise disposed, for instance, as indicated in Fig. VIII, the radial projections 28 extend inwardly from the annular fuse plate 29. Moreover, as indicated in Fig. IX, the flange 25 on said body 1 may be formed as an interrupted screw thread having helieally inclined portions 31 for engagement with the detent springs 26 so as to make it possible to stress the cap 18 more forcibly toward said body 1 than by the mere resilience of said springs 26 engaging the conically inclined perimeter of said flange 25.

Therefore, I do not desire to limit myself to the precise details of construction and arrangement herein set forth, as it is obvious that various modifications may be made therein without departing from the essential features of my invention, as defined in the appended claims.

I claim:

1. I11 a multiple electrical fuse; the combination with a body including means rigidly supporting a pair of electrical terminals, in insulated, parallel spaced relation, and terminating in the same plane; of an imperforate rotary disk, of transparent insulating material, mounted to rotate on said. body, and having, inseparably fixed thereon, a plate of fusible metal comprising a plurality of members, each adapted to successively bridge said terminalsin respectively different positions of rotation of said disk; a rotary cap fitted to revolve on said body, and adapted to detachably engage said disk to turn with said cap; and means adapted to detachably connect said body and cap; whereby said plate is secluded from the outer atmosphere by said disk and said cap may be removed and replaced to successively release and hold such disks, in cooperative relation with said terminals.

2. In a multiple electrical fuse; the combination with a body having, in unitary relation therewith, screw means adapted to engage a cap of a pair of electrical terminals, in spaced relation; an imperforate rotary disk, mounted to rotate on said body, and having inseparably fixed thereon, in insulated relation, a plurality of fuse members, each adapted to successively bridge said terminals in respectively different positions of rotation of said disk; a rotary metal cap fitted to revolve on said body, and adapted to engage said disk to turn with said cap; and screw means, in unitary relation with said cap, adapted to detachably connect said body and cap; whereby said cap may be removed and replaced to suecessively release and hold such disks, in cooperative relation with said terminals.

3. In a multiple electrical fuse; the combination with a screw threaded body of insulating material, including means rigidly supporting a pair of electrical terminals, in insulated spaced relation and terminating in the same plane; of a rotary disk, of transparent glass, mounted to rotate on said body,

and carrying, inseparably fixed thereon, a plate of fusible metal comprising a plurality of radial members, each adapted to successively bridge said terminals in respectively different positions of rotation of said disk; a screw threaded rotary cap fitted to revolve on said body, and adapted to detachably engage said disk to turn with said cap; and means, including metal springs on said cap, adapted to detachably connect said body and cap; whereby said cap may be removed and replaced to successively release and hold such disks, inresilient cooperative relation with said terminals.

4-. In a multiple electrical fuse; the combination with a body having a pair of electrical terminals, in spaced relation, and terminating in the same plane; of a rotary disk, of insulating material, mounted to rotate on said body, and having inseparably fixed thereon, in insulated relation, a plate of fusible metal comprising a plurality of members, ach adapted to successively bridge said terminals in respectively different positions of rotation of said disk; a rotary cap fitted to revolve on said body, and adapted to engage said disk to turn with said cap; and means, including sectoral screw thread projections on said cap and sectoral screw thread recesses in said body, whereby said cap may be removed and replaced to successively release and hold such disks, in cooperative relation with said terminals.

5. In a multiple electrical fuse; the combination with a body having a pair of electrical terminals, in spaced relation, and terminating in the same plane; of a rotary disk, of insulating material, mounted to rotate on said body, and carrying a plate of fusible metal comprising a plurality of members, each adapted to successively bridge said terminals in respectively different positions of rotation of said disk; a rotary cap fitted to revolve on said body, and adapted to engage said disk to turn with said cap; and means, including interrupted screw threads on said body and cap, adapted to detachably connect said body and cap; whereby said cap may be removed and replaced, by a fraction of a revolution thereof, to successively release and hold such disks, in cooperative relation with said terminals.

6. In a multiple fuse structure, the combination with a rotary disk of insulating material, having a polygonal projection in coaxial relation therewith, and adapted to carry a fuse plate; of a rotary cap having a polygonal opening in coaxial relation therewith adapted to detachably engage said disk to turn with said cap.

7. In a fuse structure, the combination with a body of insulating material having a circular recess at one end thereof and elec-- trio terminals projecting into said recess in spaced relation; of a rotary disk of insulating material adapted to turn in said recess; a fusible element inseparably fixed on said disk, adapted to bridge the gap between said terminals when in registry therewith; and distant spring means adapted to hold said fusible element in contact with said terminals.

8. In a fuse structure, the combination with a sectorally screw threaded body of insulating material; of a disk of insulating material mounted to turn on said body; and a sectorally screw threaded cap mounted tofrotate on said body, having means adapted to detachably engage said disk and said body.

9. In a fuse structure; an imperforate rotary disk of transparent glass carrying a plate of fusible metal.

10. A- structure as in claim 9; wherein the glass disk is recessed and said fusible metal pressed in such recess to hold the same, in inseparable relation therewith.

11. An insulating body for a fuse structure having an interrupted'female screw thread at one end thereof, with radially projecting portions between the sectors of said thread.

In testimony whereof, I have hereunto signed my name at Philadelphia, Pennsylvania, this twenty-first day of June, 1929.

WILLIAM JOSEPH MANNING.

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