US1054965A - Fuse-cartridge. - Google Patents

Description

F. J. FERRARI. FUSHGARTRIDGE. APPLIGATION FILED MAY 81, 1911.

1,054,965 Patented Mar.4,1913.

UNITED STATES PATENT OFFICE.

FREDERICK J. FERRARI, or SYRACUSE, NEW YoRK'.

FUSE-CARTRIDGE.

Specification of Letters Iatent.

T 0 all whom it may concern:

.Be it known that I, FREDERICK J. FERRARI, of Syracuse, in the county of Onondaga, in the State of New York, have invented new and useful Improvements in Fuse-Cartridges, of which the following, taken in connection with the accompanying drawings, is a full, clear, and exact description.

This invention relates to certain improvements in fuse holders, commonly known as cartridges, adapted to be removably inserted between .the spring fingers or contact terminals of electric circuit-s for receiving and concealing. fuse wires or bars of such circuits.

Heretofore so far as I am aware, the fuse supports have always been permanently incorporated in the cartridge or tube in such manner that it has been impossible to remove the fuse support for .replacing the I burned out fuses without destroying the entire cartridge, thereby making it necessary to supply the entire cartridge when the fuse burned out or failed from any cause to perform its function as a conducting part of the electric circuit.

. bodymg The main object, therefore, of my present invention is to employ a fuse cartridge having the same general external appearance and utility as that now in common use in which the fuse supporting element is removable from the shell or inclosing case to permit the fuse to be inspected or replaced without injuring the shell or in anyway detracting from the safety or efficiency of the cartridge. In other words I have sought to provide a simple, practical and eflicient fuse cartridge capable of being used in connection with any of the switch boards to which the ordinary cartridges are now applied with the additional advantage that the fuse holder may be easily and quickly removed for inspection or replacement of the fuse and then reinserted in the shell with the assurance that it will afford as efiicient fire protection and safety against accident as any of the cartridges heretofore employed.

Other objects and uses relating to specific parts of the device will be'brought out in the following description;

In the drawings Figure 1 is an elevation, partly in section, of a fuse cartridge enithe various features of my invention. 1g. 2 is a similar elevation of the detached fuse holder omitting the tubular shell or casing. Figs. 3 and 4 are transyerse sectional views taken respect vely on lmes 3-3,

Fig. 1 and 44, Fig. 2. Fig. 5 is a longitudinal sectional view' of one of the end ferrules for the outer shell or casing showing particularly the groove for the bayonet lock. Fig. 6 is a longitudinal sectional view of a modified form of shell. Fig. 7 is an elevation of a fuse holder adapted to be used in connection with the shell shown in Fig. 6. Fig. 8 is a longitudinal sectional view through the other end ferrule for the outer shell or casing.

The cartridge shown in Figs. 1 to 5 inclusive comprises an outer tubular shell or casing 1 and a fuse holder 2- for supporting a fuse wire or bar 3, and suitable contact plates -4 which are adapted to be inserted between spring terminals 5- shown by dotted lines in Fig. l and forming a part of an electric circuit, not shown, of which the fuse wire is to form a part. -The outer shell or casing -1 pref erably comprises a tube 6 of vulcanized fiber or other suitable insulating material having an inner lining -7 of asbestos or equivalent heat resisting substance. ends of the insulating tube -6 and its lining 7 are inclosed in sheet metal ferrules -8- 8' having relatively short inturned flanges ,9 integral therewith. These ferrules perform the-- double function of binding or reinforcing the ends of the tube -6 and its lining -7-' andalso forming conductors adapted to engage the usual spring terminals of an electric circuit,

not shown, for connecting the fuse wire in provided withsuitable binding osts -12- for securing the ends of'the se wire or Patented Mar. 4:, 1913.

The

bar 3 thereto. The ends of the insulating bar 10 and ferrules or rings -11--- secured thereto are preferably circular in cross section, whilethe intermediate portion of the bar is substantially semi-circular, thereby forming a recess in one side'of the fuse holder within which the fuse -3 and its bindingposts '-12- are located.

The contact bars'--4- are shown'asintegral with or electrically connected to the ferrules -l l-. which latter are adapted to engage with a close sliding fit with theinturned flanges -Q- -of the ferrules tubular casing 1 against accidentalen l; W1S8 displacement, I provide at least one end of the fuse holder with a radially projecting stud --13- which isadapted to enter an inclined slot -14 in the adjacent flange 9 of the ferrule S when the parts of the cartridge are assembled, thereby establishing a bayonet lock between the fuse holder and outer shell or casing and permitting these parts to be readily interlocked and removed endwise one from the other when necessary, the ferrule 8 being provided in its flangef9 with a lengthwise slot 8 which permits thepassage ofthe stud, v

13. In some 1nstances,' ascin the smaller sized cartridges, the contact plates 4 may be omitted and the ferrules -8- brought into direct contact with the spring terminals of the electric circuit commonly employed for retaining the cartridge in place.

In Figs. 6 and 7, I have shown a slightly modified form of cartridge comprising an outer shell or casing 20 and a fuse holder -21-, the ends of the shell being inclosed in suitable ferrules -22 having inturned flanges 23- for sliding contact with coacting ferrules 24 on the ends of the holder -21. The inner ends of the inner flanges -23 of the shell or casing 2 are preferably crin ped outwardly so as to afford a freer passage of the fuse holder into and out of the shell and at the same time to allow closer contact between the ferrules 24 and flanges 23-. The ferrules 24 are mounted upon the ends of an insulating bar 25 similar to the bar .10 and are electrically connected to each other by a fuse wire or bar 26-yand suitable binding posts 27.

iii

The fuse holder shown in Fig. 7 may be removably inserted in either end of the shell 20 and is provided at one end with an annular knurled shoulder r-28 serving as a hand piece by which the fuse holdermay be inserted into and withdrawn from the outer shell.

.fls shown in Fig. 3, the ferrule -8- ala firmly crimped over and upon the end of the" insulating tube 6- and its linang 7 may be additionally held in place by one or more pins -29, .while the. ferrules -8'- 11 and 2-lfl maybe similarly locked to their respective bars-- -I0 and 25* by pins -30, one of which is projected a slight distance beyond the periphery of. the adjacent ferrule to form the stud -13 for interlocking engagement in the groove or slot 14. when the parts are adjusted for use.

It is evident from the foregoing, description that in case a fuse should burn out. the

productsof combustion will be confined wholly within the outer casing and if from "this cause or from any other cause the fuse should fail to perform its function as a conductor. the entire device may be withdrawn from the contact terminals of the circuit and the fuse holder removed endwise from the outer shell or casing and the fuse repaired. or replaced as may be necessary after which the fuse holder with the fuse thereon may be reinserted into the outer tube or casing and locked in place by engagement of the stud -13- with the angular slot 14.-, thereby forming a substantially air-tight compart ment in which the fuse is located, and at the same time establishing reliable electrical connections with the fuse through contact of the ferrules 8- -8-- and 9- of Figs. 1 and 2 or 22 and -24 of Figs. 6 and 7 hat I claim is:

1. An electric fuse cartridge comprising a tubular shell of insulating material having electric conducting ferrules rigidly secured on the outside thereof at its ends and having inturned annular flanges projecting inside the shell, afuse holder slidable within the ferrules and shell and provided with contact members of conducting material in sliding engagement with the flanges of the ferrules, and a fuse mounted on said holder and electrically connected to said members.

2. An electric fuse cartridge comprising a shell of insulating material open at both ends, ferrules of electric conducting material secured on the outside thereof at the open ends of the, shell and having inturned annular flanges projecting inside theshell, a fuse holder" movable end'wise into and out of the shell and" providedwith electric conducting members in-sliding contact witht-he flanges of the ferrules in the shell, and a fuse on said holder connecting said members.

In witness whereof I have hereunto set my hand on this 18th day of May 1911.-

FREDERICK J. FERRARI.

Witnesses: v

H. E. CHASE, E. F. SPEARING.

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