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Publication numberUS866716 A
Publication typeGrant
Publication dateSep 24, 1907
Filing dateJun 23, 1906
Priority dateJun 23, 1906
Publication numberUS 866716 A, US 866716A, US-A-866716, US866716 A, US866716A
InventorsRobert Charles Cole
Original AssigneePratt Johns Co
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Manufacture of inclosed fuses.
US 866716 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)

No. 866,'716. v PATBNTED SEPT. 24, 1907.



!bY/l ///1f////// //V/ //l///llllllll/l/l//l/l//l///////// of the tube.



No. &66,716,

Specification of Letters Patent.

Patented Sept. 24, 1907.

Application filed June 23,1906. serial No. szaooa To all whom it may conccm:

Be it known that I. Romana* CIARLns Com, a citizen of the United States, residing in lI-artford, county ol' Hartford, and State of Cmnecticut, (whose postollice address is the same,) have invented certain new and useful Improvements in the Manufacture of lnclosed Fuses, of which the following isa full, true, and concise specilication.

The present invention relates to the manuiacture of inclosed iuses which have auxiliary wires associated with therinclosing cases for indicating the condition of the main fuse link or other purpose; and the invention consists in the inproved and economical method ol making such fuses and in the Construction of the same, as will be presently described and more particularly pointed out in th'e accompanying claims. i

Inclosed or Cartridge fuses of modern Construction consist of a tubular ease which contains the main fuse link and is closed at its ends by netallic Caps or ferrules, which latter are electrically connected to the ends of the link, and .'onstitute, directly or indirectly, the electrieal contact terminals of the device. Th( auxiliary or indicating wire is connected to the terminals in parallel or shunt relation to the main fuse link and is usually associated in some way with the wall oi the tubular case so that when the main fuse is ruptured by the current a change is el'fected in the external appcarauce of the device. A filling of some refractory and comminuted material, capable of dissipating the heat and gases attendant upon the ruptureof the main link, is also packed into the case around the link before the end terminals are al'xed. The present invention relates more especially to the manner of eonnecting the auxiliary or indicating wire with the terminals of the main fuse, so that its electrieal contact tlerewith will be permanent and secure, and whereby the necessity of soldering the same to the use link or its terminals may be avoided without risk of subscquent disconnection and consequent failure of operation, and whereby also the partially completed fuse tubes may be stored and handled without injiry.

In the accompanying drawings, Figures 1 to 4 illustrate the successive steps in the manufacture of an inclosed fuse according to my inventio'n and Fig. 4 represents an inclosed fuse embodying iny invention with one end shown in longitdinal section.

In the practice of the invention, the fine wire A is iirst threaded into or otherwise assoeiated with the fuse tube or case B so that a certain portion of it occu pies a predetermined position with respect to the Wall In the ease illustrated, th central part of the wire is located at th exterior of the fuse tube and the ends pass through' fine holes into the interier and from thence project toward or out of the open ends of the tube. The projecting ends of this fine wire are then pushed or drawn through suitable openings C, previously made in the casing, as indicated by Fig. 2, and netallic lolders D, which may Conveniently be ordinary unlacquered Copper eyelets, are then pushed into the said apertures and clenched theren so as to bind each end of the fine wire firmly between the wall of the opening and the body oi the cyelet. By this means the fine indicator wire, which has considerable tenper or resilieney, is securely and positively fastened to the ends of the use case so that it cannot spring back within the same or otherwise become displaeed, and is maintained in good electrical connection with a contact member, i. e. the head of the holder, located on the exterior of the tube. The invention, lowever, is not 'limited to this-particular method oi 'i`astening, and metallic holders of other forms than the eyelet heroin shown may be employed with equal effect provided !hey have secure eleetrical contact with the line wire.

The setting of the cyelet may be done by hand or by any ordinary punching mechanism, but I preler a means which will leave the head or flange of the cyelet slanted toward the end of the case as indicated by Fig. 3, so that the end cap H may be readily pushed over it as will be presently described. When the indicator Wire has its central part located ou the outside of the hise tube, as in the present illustration, a protecting paster E, represented by the black line in Fig. 3, is placed over the exposed portion for the purpose 'of proteeting the same and the iuse tube and attached wire may then be stored or transported, even with eonsiderable roghness in handling,` without in any way injuring the fine wireor affecting its connections, which, as previously described, are rendered permanent by the upsetting of the eyelets.

In completing the device, the main use link l and the filling G are inserted into the tube and the ferrules I-I are pushed over the heads of the holders and secured in place by rneans of the screws .H in ordinary manner. The ferrules in encountering the inclined heads, which are of comparatively soft metal and in riding over the same, wear for themselves clean-wiped contact surfaces with said heads, whereby the said ferrules are brought into good eleetrical connection with the ends of th indieator wire.

In Fig. 4 of the drawing the relation of the ferrule and head of holder is somewhat exaggerated for illustration, but it will be understood that the ferrule fits snugly upon the end of the fuse case notwithstanding the interposed head of the holder. i The presence of the said holder in addition serves to aid in retaining the ferrule in position. i I

In the device as shown in Figs. 3 and 4, an outside label .T eovers the paster E and is properly arranged with respect to the same and to the wire so that it becones charred or dscolored when the indicator wire becomes heated or fused, but the arrangement of the label or of other means for producing` an ndication by the beat of the indicator wire is not material to the' an end closure for the case coverlng said metalllc holder. 2. 'As u mems for securing the indicntor wh' es of inclosed fses, the comhination with the caslng having an opening therein. of an eyelet inserted in said opening and upset 01: pressed against the end portion of the wire.

3. An inclosed fse comprisim an in cl osing case having an indicator wire :ssm'iated therewith, metallic holders` fastening the ends of said wire to the wall of the case,`

fer'ules closing the ends of the case and means independcnt of sid holder for securing sid ferrules in place.


4. An inclosed 'se comprising an inclosing case, an 'indlcator wire with its ends located in opnings in the wall of said case, metnllic holders in sid openin'gs in contact with said ends and fet-rules on the ends of the case in contact with said holders.

5. An inclosed fse`comprislng .un inclosing'case, un lndicrtor wire as sochted therewith, and nu inclined cputct member located on snid case in electricalv contact with said wlre, in combinntion with a metullic contact ter'- minal fitting the end of said case and nd-.pted to rlde over said inclined member. v

G. An inclosed fe comp'ising n inclosing case-und terminal Contacts thereon, :n indicator wire associated with sid case and a metallic holder fastenlng the end of said wlre to the wall of the cnse lndependently. ot said terminal Contacts. c


V witnesses:


Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US6114941 *Dec 4, 1998Sep 5, 2000Alliedsignal Inc.Thermal switch with activation indicator
US6566996 *Mar 29, 2000May 20, 2003Cooper TechnologiesFuse state indicator
US7369030Sep 8, 2004May 6, 2008Cooper Technologies CompanyFuse state indicator
US7405646 *Jun 26, 2002Jul 29, 2008Littelfuse, IncMultiple conductor indicator
US7592893 *Jun 24, 2008Sep 22, 2009Littelfuse, Inc.Multiple conductor indicator
US7636028Jul 20, 2006Dec 22, 2009Littelfuse, Inc.Diagnostic fuse indicator including visual status identifier
US20040000983 *Jun 26, 2002Jan 1, 2004John KennedyMultiple conductor indicator
US20040124962 *Dec 26, 2002Jul 1, 2004Ching-Lung TsengProtection device for a fuse device
US20060049911 *Sep 8, 2004Mar 9, 2006Darr Matthew RFuse state indicator
US20070018775 *Jul 20, 2006Jan 25, 2007Littelfuse, Inc.Diagnostic fuse indicator including visual status identifier
Cooperative ClassificationH01H85/30