US1275442A - Cartridge-fuse. - Google Patents

Description

0. H. JUNG.

CARTRIDGE FUSE.

APPLICATION r1120 MAYIQ. I9I7.

1,275,442. Patented Aug. 13, 1918.

1 I W m m I I tachin UNITED STATES PATENT OFFICE.

OSCAR H. JUNG, MILWAUKEE, WISCONSIN, ASSIGNOR TO ARROW FUSE & MFG. 10.,

) OF MILWAUKEE, WISCONSIN.

CARTRIDGE-FUSE.

Patented Aug. 13, 1918.

Application filed May 19, 1917. Serial No. 169,638.

To all whom it may concern:

Be it known that I, OSCAR H. J one, a citizen of the United States, and resident of Milwaukee, in the county of Milwaukee and State of Wisconsin, have invented certain new and useful Improvements in Cartridge- Fuses; and I do hereby declare that the following is a full, clear, and exact description thereof.

My invention relates to certain new and useful improvements in fuses, and refers to a fuse embodying somewhat the same principles as those embodied in my application filed March 8, 1917, Serial No. 153325.

The primary object of this invention is to produce an inexpensive and simply constructed refillable fuse in which the fusible strip is inclosed, and which will meet the strict requirements exacted of all approved fuses by the Underwriters Laboratories.

Another object is to provide a fuse of the knife blade type in which the fuse proper is contained within a casing of non-conducting material, which casing carries the attaching blades.

A further object is the provision of such a fuse which will have novel means for atthe ends of the fusestrip with the attaching blades, and which will have novel means for securing the knife blades to the casing.

A still further object of my invention is the production of a device of the character and for the purpose described which will be simple in construction, eflicient and practical, and inexpensive to manufacture, all things being considered.

- With the above and other objects in view which will appear as the description proceeds, my invention resides in the novel construction, combination and arrangement of parts substantially as hereinafter described and particularly defined by the appended claims, it being understood that such changes in the precise embodiment of the herein disclosed invention may be made as come within the scope of the claims.

In the accompanying drawings I have illustrated one complete example of the physical embodiment of my invention constructed according to the best mode I have so far devised for the practical application of the principles of my invention, in wihich:

Figure 1 is a sectional view taken longi tudinally through a knife fuse embodying my invention.

Fig. 2 is a sectional view taken on the plane indicated by line 2-2 of Fig. 1.

Fig. 3 is a transverse sectional view taken on the plane indicated by line 3-3 of Fig. 1, and

Fig. 4: is a perspective View of the yoke clamp employed to rigidly secure the knife blades to the outer casing.

Referring now more particularly to the several figures of the drawing wherein similar reference characters designate like parts, the numeral 1 denotes a cylindrical tube of fiber or other non-conducting material and for closing the ends thereof, a pair of like metallic caps 2 are employed provided each with a centrally disposed elongated slot 3 an a pair of smaller slots 4 disposed one on each side of said central slot.

Engaging the slots 3 are a pair of attaching blades 5 having their outer ends plain for engagement with the usual spring clip of a switch board (not shown) and their inner ends disposed inside of the caps 2 and provided near their inner edges with recesses 6 to allow adjustment therein of threaded screws 7 employed for securing the caps 2 upon the casing 1.

The screws 7 also assist in retaining the knife blades 5 in the caps 2 and engage the arms 8 of the yoke clamps 9, said yoke clamps being provided with portions 10 adapted to lay flush against the inner surface of the caps 2 having laterally turned arms 8 and then inwardly turned forked or bifurcated portions 11. said bifurcated por tion engaging the blades 5 as clearly shown in Fig. 1. The yoke clamps are thus in the form of substantially U-shaped plates having slotted base portions and inturned bifurcated end portions.

The yoke clamp 9 is adapted to be secured to the caps 2 and for this purpose is providcd with a pair of laterally extending ears or lugs 12 adapted to be bent outwardly and then inwardly and engaging the slotted.

Y openings l as more clearly shown in Fig. 2.

Thus it will be seen that the knife blades 5 are rigidly, but detachably secured to the caps 2, forming a verv desirable construction.

T he fuse cartridge proper is disposed in the casing 2 and consists essentially in the tubular casing 13 of noirconducting n1a terial-having closing the ends thereof a pair of metallic caps 14 provided with ventilating openings 15 and elongated slots 16 through which pass the fusible strip 17 having the I usual reduced central. portion 18 and being surrounded by a finely divided arc-choking material 10. p The ends of the fuse strip 1'? extend outwardly of the caps 14 and are provided with apertures 19 adapted to engage the'bolt 20 which also engages a corresponding aperture 21 in the inner end of the blades 5. In this way the fuse strip is connected with the blades .5 and to prevent shifting of the fuse strip Within its container cotter pins 22 are employed disposed one at each cap 14.

Thus it will be seen from the foregoing description taken in connecti'on with the accompanying drawing that l have provided a fuse in which the fusible link will be readily interchangeable and one which accomplishes the desired objects Without the complicated arrangement and construction of the existing fuses of this type.

What is claimed is:

1. A device of the class described comprising an open end casing, a slotted cap for closing one end of the casing, an attaching blade extending through the slot or" the cap, a lil shaped plate having a slot in its base receiving said blade, the arms .of the plate being secured to the casino, means carried by the arms for engaging the inner end of said blade, and a fusible link secured to said blade,

2. A device of the class described comprising an open end casing, a slotted cap for closing one end of the casing, an attaching blade extending through the slot of the cap, a 'ol-shapedplate having a slot in its base receiving said blade, the arms of the plate bein secured to the casin the inner end b I or one of said arms being inturned and b1- furcated, the inner end of saidblade being disposed between the furcations, and a fusible link connected to the inner end of said blade.

3. A device of the classdescribed comprising an open end casing, a slotted cap for closing one end of the casing, an attaching blade extending through the slot of the cap, a U-shapedplate having a slot in its base receiving said blade, the arms of the plate attaching blade disposed through said central slot, a U-shaped plate having a slot in its base receiving said blade, means on the arms or the plate for engaging the inner end of the blade, lugs extending from the plate and disposed in said relatively smaller slots in the cap, and a fusible link connected with the inner end of said blade.

5. A device of the class described comprising an open end casing, a cap for-closing one end of the casing, said cap having a central slot and relatively smaller slots disposed one on each side of said central slot an attaching blade disposed through said central slot, a plate having a slot receiving said blade, oppositely extending lugs on the plate, said lugs beingdisposed through said relatively smaller slots and bent laterally, means carried by the plate for enga ing the inner end of the blade, and a fusi le link connected with the innerend of said blade.

6. Adevice of the class described comprising an open end casing, a slotted cap for closing one end of the casing, an attaching blade extending through the slot in the cap, the

opposite edges of said blade being notched,

a U-shaped plate having a slot in itsbase receiving said blade, screws extending through the cap and the arms of said U- shaped plate and engaged with said notches blade to limit every movement thereof, and a fusible link secured to the inner end of the blade.

7. Anelcctrical fuse'unit comprising, in 1 combination, a non-conducting open ended casing, metallic caps covering the ends thereof and provided each with a central clon-' gated slot and relatively smaller slots disposed one on each side of said central slot,

an attaching blade carried by each cap and projecting throu h the central slots into the casing, a yoke 0 amp having lugs engaging the smaller slots and having their ends inturned to clamp the inner ends of said blades and a fuse cartridge disposed within said casing and having its fusestrip in 0011- nection with the inner ends of the attaching blades. I 1

8. A device of the class described com.- prising an open end casing, aslotted cap for closing one end of the caslng', an attaching blade extending through the slot inflthe cap, the opposite edges of said blade being notched,-a U-shaped plate having a slot in its base receiving said blade, the inner ends of the arms of said plate being inturned and bifurcated to receive the inner end of said 5 blade, screws extending through said caps and the arms of said U-shaped plate and engaged with said notches in the blade to limit.

outward movement of the latter, and a fusiblade.

ble link secured to the inner end of the 10 In testimony that I claim the foregoing I have hereunto set my hand at Milwaukee, in the county of Milwaukee and State of Wisconsin.

@SOAR H, JUNG.

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