US2333942A - Fuse - Google Patents

Description

9, 1943- c. LA MAR 2,333,942

4 FUSE Filed Sept. 9, 1941 ATTORNEY indicator.

-ence designate corresponding the several views, and in which: l v d v Figure 1 is an elevational view. partly ln.sec-

' my invention.

Patented Nov. 9, 1943 TE u TAT S OF IC j 511,,

-*rrsnkc nmasrucsomml-.fj c r Application September 9, IMlf SeI-ial'No. 410,122 i l some. (01.2064121). V M

' This invention relates to fuse'clips, particularly to fuse clips for cartridge type fuse and more particularly to a .combinedficlip and It is Well knownto those skilled in the fuse clip art that when an extremely heavy explosion or concussion occurs near a fuse 'clip, especially in such places as warships," the fuse in the fuse clips is likely .to be either thrown from the clips in which it is held or forced down into the clip in a practically inoperative position. i

A principal object of this invention is to provide a clip combined with an indicator which shall be so constructed and arranged that both' the fuse and the indicator will be so held that neither will b thrown from operative position by a severe explosion 1ori concussion in the immediate vicinity thereof.

A further object of the invention is the con struction of a device of tl e'type specified which will be simple in construction, easy to manufacture, convenient to install, low in cost, and easy to maintain and use. f

' Other objects and advantages will appear as the description of the particular'physical embodiment selected to illustratethe invention progresses and the novel features will be larly pointed out in the appended claims.

In describing the invention in detail and the particular physical embodiment selected to illustrate the invention, reference will .be had to the accompanying drawing; and the several views thereon, wherein like characters of. referparts throughout tion, of a device embodyingmy inventiongjl fig. 2 is a view of the device as shown by Fig. 1 as seen from the left hand end thereof; Fig. 3'is a crosssectional view of the device as shown in Fig. 1 on the plane indicated by the 1ine.III -;III of Fig. 1, viewed in the direction of the arrowsat the ends of the line; 'Fig. 4 is a fragmentary cross-sectional view of the device as shown by Fig. 2, on the plane'indicate'd by the line IV.-IV

particuof Fig. 2, viewed in the direction of the arrows at the ends of the line; Fig.5 is a top plan view of an indicator alone used in connection with has no novelty in and of itself or incombination with my invention as it is merely illustrative of a mounting plate. r. This mountingjplate should,

sulatingfmate'rial. H W The usual and ordinary cartridgefuseof commerce, as shown in Fig. l, is designated'l, This fus'e', as is usual. is provided with usual metallic capsf3 and 4. It is understood that within the interior-pf" the cartridge; 2 is the usual fusible link electrically connectingthemetallic' caps 3 and}, but the internal construction of the car tridgefuse is nopart of my invention.

As most clearly shown in" Fig. 2,. themetallic caps, as 3 a'nd'4, arepositioned between the legs of substantially Ushap'ed spaced clips 5 and 6. A vU-shaped clip, as 5, has each. leg formed for a portion of its length into substantially thearc of a 'circleas I. The radius of this circle should be substantially the radius. .of. the outside diameter of a cap. as 4. The two-1egs,.as 8 and 9, of the clip areso formed and so positioned that before the positioning of, a fuse. cap, asf4 therein, they are somewhat nearer togetherthan as shown in Fig. 2 so that when-the cap, as 4, isforced thereinthe two legs as 8 and S are forced apart and bear resilientlyagainst the outside surface of a pra-s4. The material of which the clips, as 5, is made can be any of the usual materials used for such. purpose, such a spring brass.

Each of the clips, as 5 and 6, also has on each of course, be. made as is usual; of d a suitable inof the legs, as 8 and 9, teats, as llland l l-, best of the cartridge fuse Zendwise.

Each clip, as 5 and 6, also has a combined fuse indicator and holding standard, as l2 and I3 positioned on the-far side thereof. v These standards, as '12 and-l3,zare preferably integral with the. clipswith which they are associatedandinternie'diate the legs of the clips. Infactthey may be struck out-of the same sheet of metal from which the clips, Lasi; are. struck and then bent up .into the form as shown inFig. 2yjust as the legs 8. and '9 are bent up to-the form asishown in Fig. 2. These standards-as 1.2, extend out from the base, as M, of aclipand then upwardly, forwardly of the ends ,of the legs of, the clip, as

shownin Fig. 1.. The standards, as I2, are, however, positioned such that the outside face, as l5, issubstantiallyin line with the outside face of the teats, as In and u, so that the: fuse and fuse clips together occup ysubstantiall y no more space. longitudinally than ordinary and .well known'fuse clips; f

The fuse indicator and holding standards l2 and I3 each has means at its upper or free end by which to attach a fuse indicator. In the form shown in Fig. 1, standard II has a rectangular slot IS in its upper end and standard I3 has a circular perforation ll therein connecting with a narrowed slot I8 opening in the upper face I9 of the standard I3.

Between the standards l2 and I3 there is positioned a fuse indicator. This fuse indicator, in outward form, is an elongated member, preferably a cylinder 20, formed of insulating material,

as best shown in Fig. 1. At one end thereof and suitably attached thereto, is a tongue 2| having I a right angle bend intermediate its ends. At the other end, the fuse indicator is provided with a plug 22 provided with an internal thread 23. A stud 24 is provided having external threads 25 formed on the outer surface thereof for a portionof the length of the stud. The stud also has a reduced diameter or a narrow neck at 25 and an enlargement or collar at 21. The narrow pack 26 is cfisuch diameter that it may be moved downwardly through the slot 18 as shown in l'ig. 3. The collar 21 is of such diameter that it just neatly 'or substantially fits into the perforation or orifice ll. The stud 24 has an insulating handle or knob 28 fastened rigidly thereto in any suitable or appropriate manner, as by a pin 23, for turning the stud. After the stud is inserted in the plug 22, the end '55 is spread so that the stud cannot be removed and so lost.

By the construction 'hereinbefore described-it will be readily apparent that a cartridge fuse,

as 2, in the absence of the indicator 20, maybe pushed into the fuse clips, as and 3, to take the position as shown in Figs. 1, 2 and 8. Then the fuse indicator 'mayhave the end of tongue 2| entered into the slot l8 by holding the indicator about at a right angle to the fuse2 and then bringing it "down towards parallelism with face 2 whereupon the narrow neck' 26 may be passed through the slot I8 and then'the collar 2! moved into the perforation H by turningthe knob 28 which causes the screw thread cooperating with screw thread 23 to advance the stud into the collar 22 until the knob 2'3 seats firmly against standard ll and perhaps collar 2! seats against collar 22-. I

When the fuse indicator -or integrity inQlcI/t'or 20 is in position above, the fuse 2, .as shownin Fig. 1, if any concussion occurs in the vicinity of the fuse 2 tending to throw the outof the fuse clips toward the fuse indicator, the fuse indicator will act as a holder and prevent the fuse from being thrown from its clips.

Any suitable or appropriate Items may be used for supporting the clips, :as I and 0, at a suitable distance apart and in proper alignment. I prefer to support the clips, as i and, W011 conducting " blocks 30 and 2|, respectively. Clips 5 and 6 may be attached elwtrically and mechanically to blocks 30 and 3| in any suitable and appropriate manner, but if prefer to dorm orifices, as 32, in each of the clips "and to pass a screw threaded headed member, as .33, through the orifice into a screw threaded cavity 24 of "the block, as 31). This construction not only gives a firm and secure attachment of the clip to the block but it also, if a proper screw is used, such as a fi-lister head, provides an abutment at each of the clips, on the bases thereof, which is of great importance. This head, as '35, is made of such a height that it comes avery short distance of a cap, as 4. As there are one of these resistance.

screws at each end of the fuse, if concussion occurs, tending to drive the fuse downwardly, as viewed in Fig. 1, that is, into the fuse clips into an inoperative position, this motion is prevented by the heads, as 35, of the screws, as 33, so that undue inward motion cannot take place.

By the construction described, it is evident that a concussion, blow or explosion adjacent the fuse cannot operate to jar the fuse out of the clips, outwardly or in an upward direction, as shown in Fig. 1, as hereinbefore explained, nor can it jar the fuse out of the clips into an inoperative position, by reason of the abutment provided by secured to the desired surface in any suitable or appropriate manner, but it is preferred to form a screw threaded portion, as 36, on each which will serve to go through an orifice, as 31, in a mounting plate and afiordmeans for securing to the mounting plate by a nut 38 and a further lock nut, as'39.

The indicator itself, best shown in Fig. 4, includes an elongated hollow body 43, preferably in the form of a hollow cylindrical tube having a sight opening 4|. Just beneath the sight opening 4| there is positioned a lamp 42. This lamp may be of any suitable or desired type and form but it is preferred to use a lamp of the discharge type having two electrodes, as 43 and 44, therein which argon or both. There are lead wires, such as 45 and 46 issuing from the lamp. One of these lead wires '45, connects to one end of a resistance 41 of the grid leak type of the order of 50,000 ohms The other end of the resistance being connected by a conductor 48 to the metallic electrical conducting sleeve 22. The outlet wire 46 connects to the tongue 2| which is made of a metallicelectric conducting material, such as copper or brass.

The sleet/e22 may be held with'inthe end of the tube 40 by any suitable or appropriate means but I preferto form acavity, as 49, in the sleeve 22 and a cavity 50 in the tube 40 and to then drive a drive screw 5| through the opening in the tube 40 into the cavity in the sleeve 22.

The tongue 2| may be held in place in the end of the tube 40 in any suitable or appropriate manner but applicant prefers to hold it therein by means of a rivet, as 52, passing through the wall of the tube '40 and through the material of the tongue 2| but it is entirely feasible to omit the rivet and to hold the tongue'2'l in the end of the tube "40 merely by means of the closure 53. This closure 53 is put into the end of the tube along with the tongue 21 and when pushed home can well be relied upon to hold the tongue in, place because the closure 53 I prefer to make of a comparatively soft rubber having considerable resiliency although I do .not mean to exclude the use of amuch firmer material such as hard rubber for closing one end of the tube 40. The lamp 42 is held in place by the lamp holder 54 which is that is, a fllister head screw 35 for preventing 'inward'movement of the fuse 2,, .I do not thereby intend to exclude any other form of abutment I mean to exclude other specific forms of fuse indicator which may be provided and which may be so constructed as to have the ends attached fixedly but manually movable from the standards, as l2 and I3.

It is further to be understood that although I haveshown the member 20 as being a fuse indicator'it might well be free from any indicating properties, that is, a member such as 20 could well be used merely as a fuse holder, and the body simulating applicants fuse indicator might well be a plain cylinder or other suitable form fixedly attached at each end to the standards as l2 and I3 merely to prevent the fuse from being shaken from the clips. Applicants fuse indicator could act merely as a fuse holder by omitting the lamp 4| and its connections.

Although I have particularly described a par- 1 ticular embodiment of. my invention and explained the principle, construction and mode of operation thereof, nevertheless, I desire to have it understood that the form selected is merely illustrative but does not exhaust the possible physical embodiments of the idea of means underlying my invention. I

What I claim as new and desire to Letters Patent of the United States, is: e

1. A cartridge fuse holder, including, in combination: two spaced substantially U-shaped clips, each adapted to receive and hold an end of a secure by cartridge fuse; standards, one on each clip and positioned'on the far side of each and each standard extending forwardly of the ends of the legs of the U clip, one standard formed with a slot adjacent its free end, the other formed with an orifice connected by a slot of less width than the orifice opening in the face of the free end; an elongated member; a' tongue protruding from one end of the elongated member insertable in the said first mentioned slot; a plug formed with a,

through screw threaded bore in the other end of the elongated member; an externally screw threaded stud engaging the screw threads of the plug, said stud formed with a reduced diameter portion and with an enlargement, the said enlargement substantially fitting the orifice in the standard and the reduced diameter portion passable through the slot connectingwith the orifice whereby the elongated member may be positioned fixedly between the standard and serve as a holder to prevent the fuse from moving out of the clips, means carried by the elongated member to indicate the integrity of the fuse.

2. A fuse indicator, including, in combination: a hollow elongated body provided with a sight opening; a metallic electrical conducting tongue projecting from one end of the body; a metallic electrical conducting plug in the other end of the body, said plug formed with an internally threaded through bore; an externally screw threaded metallic stud threaded into the plug, said stud formed with .a reduced diameter portion and an enlarged collar; an electric lamp within the body at the sight opening; means for electrically connecting, said lamp to the tongue and to the plug and means for electrically connecting said tongue and said stud to a fuse clip containing a fuse whereby the integrity of the fuse may be indicated.

FRANK C. LA MAR.

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