US1113528A - Fuse-block. - Google Patents

Description

U. S. ANDERSON, DECD. L. B. ANDERSQN, ADMINISTRATEIX.

- FUSE BLOCK.

' APPLICATION FILED SEPT. 8, 1913. 1, 1 1 3,528. Patented 001.13, 1914.

WITNESSES 1 I INVENTOR (1% 1 U5 flradeatiozz Z60 2:

' ATTORNEYS UNITED STATES.

PATENT OFFICE.

ULIN' S. ANDERSON, DECEASED, LATE OF DALLAS, TEXAS, BY LOU BELLE ANDERSON,

ADMINISTRATRIX, 0F DALLAS, TEXAS.

FUSE-BLOCK.

Specification of Letters Patent.

To all whom it may concern Be it known that ULIN S. ANDERSON, deceased, late a citizen of the United States, residing at Dallas, in the county'of Dallas and State of Texas, did invent certain new and useful Improvements in Fuse-Blocks, and I, Lou BELLE ANDERsoN, administratrix, a citizen of the United States, resident of Dallas, in the county of Dallas and State of Texas. do hereby declare that the following is a specification thereof.

The invention relates to a new and useful fuse block, and is particularly intended for usein a primary circuit.

The fuses of a primary circuit are most frequently burned out at night, when the circuit is most heavily loaded. The breaking down of the fuses is most commonly due to the wires of the circuit becoming excessively charged by lightning during a rain storm. Thus the workof installing new fuses to replace those that have burned out must usually be done at night and during a down pour of rain, under which disadvantageous conditions, the workman will incur a considerable risk of being electrocuted, unless the fuse blocks are so constructed as to eliminate this risk. I

The primary circuit fuse blocks that are commonly used in the present practice, are so constructed to receive wire fuses, the extremities of which must be secured to the circuit terminals by binding screws, requiring the use of a screw driver. This construction is objectionable for the reason that an electrician working at night is handicapped by the necessity of using a screw driver and is often occasioned much trouble and loss of time to the binding screws being accidentally dropped to the ground from the top of the pole. A further objection to the type of fuse-blocks that are commonly used in primary circuits lies in the fact that a workman engaged in installing new fuses must place his hands in dangerously close proximity to the wires of the circuit. Another objectionable feature of the common fuse block is that an arc may be formed between the terminals of the fuse block, when the workman has removed the plugs from the block to place new fuses upon the plug.

It is one object of the invention to provide'a fuse block adapted to receive fuses of the cartridge type, so constructed thatthe use of tools.

Patented Oct. 13, 1914.

Another object of the invention is to provide a fuse block having a fuse-carrying cap disposed at its extremity opposite to that at which the circuit wires enter the box, so that a workman may remove the cap without placing his hands in proximity to the wlres.

A further object of the invention is to provide a fuse block having a fuse-carrying cap, so formed as to provide ample insulation between the fuses and the hands of a workman grasping the cap.

"Still another object is to provide a flise block to be interposed in one side of a primary circuit and containing two fuses, so that any are that may be formed between the terminals of one fuse after said fuse has burned out will be destroyed by the burning out of the other fuse.

Finally, the object of the invention is to provlde a device of the character described that will be strong, durable, simple and efiicient, and comparatively easy to construct.

VV1th these and various other objects in View, the invention has relation to certain novel features of the construction and use,

an example of which is described in the following specification, and is illustrated in the accompanying drawing, wherein:

Figure 1 is a front view fuse block, showing a portion of the bracket upon which the block is mounted. Fig. 2

is a top view of the fuse block with its capremoved. Fig. 3 is a bottom view of the cap. Fig. 4c is a view of the fuse block in verticalsectional elevation, the section being taken through the center lines of the .two fuses. Fig. 5 is a detail sectional view, the section being taken upon the line Y Y of the improved of Fig; 4. Fig. 6 is a detail vertical sectional view of the same, the section being taken upon the line ZZ of Fig. 5.

Referring now more particularly to the drawing, wherein like reference characters designate similar parts inall the figures, the numeral 1 denotes the body of the fuse block, which will preferably be formed of porcelain. Upon the rear face of the body 1, there is integrally formed a rectangular projection 2, by which the said body is held slightly spaced from the metal bracket 3 to which the body 1 is secured by the bolts 4. In the body 1, there are formed two each aperture 6, there is inserted a binding post 7, formed at its upper end with an annular flange 8 adapted to rest upon the bottom of the aperture 5. Upon the flange 8 of each post 7, there is formed a number of depending pins 9, which, when said posts have been inserted into the apertures 6, will enter suitable sockets formed in the bottom of the apertures 5. The wires 10 comprising one side of the primary circuit are introduced into the body 1 from opposite sides of said body through horizontal apertures 1O communicating with the apertures 6, and are engaged in a permanent contact with the binding posts 7 by binding screws 11. In order to securely hold the binding posts 7 to their proper place at all times, a small quantity of sealing. wax is poured into the apertures 5 upon the flanged upper portions of said post. In order that the flanged upper ends of the binding posts may be securely embedded in the sealing wax, a recess 12 is formed at the bottom of each.

aperture 5, serving to conduct the sealing wax beneath the flange 8.

The body is adapted to receive upon its upper extremity a porcelain cap 13, formed in its under face with an aperture 14 adapted to snugly receive the upper end of the body 1. A large knob 15 will be formed on top of the cap to serve as a handle by which the cap may be gripped. Within the aperture 14 at one side thereof, there is formed integral with the cap 13 a rectangular block 15*, which, when the cap is mounted in its proper position upon the body 1, will enter a suitable aperture 16 formed in the top of said body. In the aperture 14, there is, furthermore, centrally mounted an electrical conductor having the nature of a metal plate 16, contiguous with the under surface of the cap 13, and formed upon one edge with a pair of lugs 17 which are bent at right angles to the plate and are bolted to the block 15*. The plate 16 forms a support for and establishes electrical connection between two fuses 18 of the cartridge type, which fuses are each provided at one extremity with a metal cap 18 carrying a stud bolt 19 adapted to be engaged in a suitable threaded aperture provided in said plate. The cap 13 may be formed with recesses 20, adjacent to the apertures receiving the stud bolts 19, said bolts being permitted to project into said recesses. The

. other extremity of each fuse 18 is provided with a metal cap 21 which is gradually tapered to a point. The fuses 18 are so spaced and proportioned that they may be inserted into the apertures 5 as the cap 13 is being mounted upon the body 1. When the cap is mounted upon the body, the tapered caps 21 of the fuses 18 will be engaged within sockets 22, one of which is mounted upon each post 7. Each socket 22 comprises a plurality of resilient metal strips forming substantially a tube, said strips being spread slightly from the center of said socket when the cap 21 is inserted in the correlated socket.

- In order that the air within the apertures 5 may have an outlet, when suddenly expanded, due to the heat generated by the burning out of a fuse, the apertures 5 are made to communicateat their lower extremities with passages 23 communicatingwith an opening 24 in the bottom of the member 1.

When a fuse block'embodying the above described novel features is'iustalled in a primary circuit, the current, under normal conditions will flow between the two wires 10, through the binding posts' 7. the fuses l8,'and the metal plate 16. \Vhen either fuse 18 is burned out, there will be no flow of current through the fuse block, unless an arc is formed between the caps carried by the extremities of the burned out fuse. If, however, such an arc is formed, the other fuse 18 will be innuediately burned out, preventing any possibility of further arcing. Owing to the considerable space lying between the cam 13 and the wires 10, an electrician may remove or replace said caps without bringing his hands in close proximity to the wires. It is to be furthermore observed that the cap 13 absolutely prevents any moisture from finding its way into-the fuse block. It will be readily seen that the fuses 18 may be mounted upon the cap 13 or removed from saidcap without necessitating the use of any llt erly come withinthe scope of the following 7 claims.

What is claimed is:

1. In a fuse block, an insulating body having parallel elongated recesses, binding posts, one mounted in the body at the bottom of each recess, sockets mounted on the ends of the binding posts within the recesses of the body, an insulating cap fitting on thebody, a contact plate secured in the cap, and a pair of fuses removably attached to the plate and positioned so as to project into the recesses of the body, and engage in the sockets.

2. In a fuse block, an insulating body having a pair of parallel elongated recesses and a central wall between the recesses, binding posts mountedin the body at the bottom of the recesses, spring sockets mounted onthe binding posts within. the recesses, an insulating cap fitting on the body, a contact plate secured in the cap, fuses removably mounted on the plate and depending into the recesses of the body, said fuses having reduced ends entering the sockets, and means for fastening the block in an upright position. a

3. A fuse block comprising an insulating body formed with two tubular apertures communicating with its top, a pair of binding posts mounted in said body at the lower end of saidaperture, a cap superimposed upon the body, a socket superimposed upon each binding post within the correlated aperture, and means for mounting a pair of fuses upon the cap such as to establish a connection between the same.

4. A fuse block comprising an insulating body formed with two tubular apertures communicating with the top of the body, which apertures havecommunication with vent passages opening at the bottom of the body, a cap superimposed upon the body, and meansfor mounting upon the cap fuses received by said tubular apertures of the bod 5. A fuse block comprising an insulating body formed with two parallel tubular apertures opening in the top of the body, vent passages establishing communication between said tubular passages and the exterior face of the body, binding posts disposed adjacent to the bottom of each tubular passage, a socket surmounted upon each binding post a cap separably surmounted upon said body, a metal plate mounted upon the under face of the cap, fuses being mounted in the tubular apertures of the body establishing electrical connection between said sockets and said metal late.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

Mus. LOU BELLE ANDERSON, Administratfiw 0f the estate of Ulz'n S.

Anderson, deceased. Witnesses:

JACK A. SoHLnY, JOHN M. SW.

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