US802553A - Plug-fuse board. - Google Patents

Description

No. 802,553. PATENTED OCT. 24, 1905.

I W. P. BOSSERT.

PLUG FUSE BOARD.

APPLICATION FILED I'EB.14.1905.

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WITNESSES:

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UNITED STATES PATENT OFFICE.

WILLIAM F. BOSSERT, OF UTICA, NEW YORK, ASSIGNOR TO THE BOSSERT ELECTRIC CONSTRUCTION COMPANY, OF UTICA, NEIV YORK.

PLUG-FUSE BOARD.

Specification of Letters Patent.

Patented Oct. 24;, 1905.

Application filed February 14, 1905. Serial No. 245,637.

To rtZZ whom, it may concern:

Be it known that 1, WILLIAM F. BossER'r, residing at Utica, in the county of Oneida and State of New York, have invented'certain Improvements in Plug-Fuse Boards, of which the following is a specification.

The invention about to be described has reference to plug-fuse panels or boards of the variety shown in Patent No. 7 38 ,519, granted to me September 8, 1903, upon which the present application is an improvement and has especial reference to the plug-fuse holders' which are provided with the branch busbars from the main bus-bars in such boards.

Commonly the plug-fuse holders are made from metals of rather high resistance, as brass castings, and are interposed in and are attached to the branch bus-bars; but I have found that such brass devices are of very much greater resistance than sheet metals as, for instance, copper-and are also much more costly, as extra Work is required in filing and smoothing the same in order that they shall present a finished appearance. In carrying out my invention I form the said holders preferably from heavy sheet-copper by first stamping out a blank and then drawing or pressing the same into the required shape by passing the blank through a progressive series of dies and forming therein a threaded nut to receive the ordinary commercial fuse-plug and drilling holes for screws and bolts.

The invention also. relates to the combination of such an improved fuse-holder with the bus-bars, the branch bus-bars, and the supporting-base of a panel or board, as I will now proceed to describe, and point out in the appended claims.

Of the drawings which form a part of and illustrate the invention, Figure 1 is a plan view of a base panel or board with one of the fuse-plugs omitted from a holder. Fig. 2 is an elevation of the same, one of the fuseholders being represented in section on line a; 00 of Fig. 1. Figs. 3, 4, and 5 are to represent the method of stamping out and drawing or pressing the fuse-holder from sheet, Fig. 3 being a plan view of a blank, Fig. 4 an elevation of the same, and Fig. 5 an elevation of a holder as it leaves the last dies.

In the drawings, a represents a slab of marble or slate forming the insulating base or Tsupport for the respective parts .of the panel or board, and 1 and 2 are hollow posts to which the leading-in conductors may be connected,which are secured to the base a by the bolts 6 6, also passing through the busbars 9 and 7, respectively. The bus-bar 7 is connected to the branch bus-bar 4 by the screw 8, while the bus-bar 9 is elevated to pass over the bar 4 and connects with the branch bus-bar 3 by the screw 10, provided. with the nut 11. The parallel branch busbars 3 and 4 are preferably of unequal length and are secured to the base a by the bolts 13 at each end thereof, having a fl at head 1 2, upon the top of the bars. The bolt 13 extends through the base a and is provided with a nut 27, by means of which the head 12 is drawn down hard upon the bars 3 and a. The heads 12 of the bolts constitute a contact-surface, as will be explained hereinafter, for the fuse-plug.

The fuse-plug holder A is formed preferably from sheet-copper of the proper thickness, and a blank similar to that shown in Figs. 3 and 4, A is stamped therefrom. A hole I) is punched at one end and a tubular portion 0 turned down. The blank has an enlarged part c and a tang (Z, and by subsequent operations the enlarged portion a is hollowed or sunken, as 6 and its edges turned up at substantially right angles, as f f, leaving the ring part 7t and the tang or foot (Z in two different and parallel planes, and then a coarse thread 9 is formed on the inner surface of the tubular portion 0 and holes are drilled for the holding-bolts in the foot. When thus formed, the fuse-holder is finished on an emery-wheel or in any other suitable manner and is ready for use. W'hen the enlarged or intermediate portion e is sunken, as described, and the edgesfturned up, a very strong support is formed, as the said edges give a bracing and stiffening effect, and the ring 7b is enabled to withstand the thrust put upon it when the fuse-plug B is screwed down hard onto the contact-head 12; but at the same time, since the holder is attached to the base at only one side and constructed as described, it is sufficiently resilient to give or yield, so as to avoid liability of damage resulting from screwing the fuse-plug B down too hard on the head 12. If the head 12 becomes pitted from sparking produced when the fuse-wire is deflagrated, it can be readily renewed and another put in its place without throwing away the bus-bar.

The fuse-holder A is placed upon the base in such a position that the center of the open ing Z) is over the center of the contact-head 12, and each holder is secured to the base by the screw 14 and the bolt 17. The bolt 17 is provided with a knurled nut 16 and serves as a binder to connect branching conductors to the holder.

B represents the common fuse-plug having a porcelain body insulating a metal screw-threaded sleeve and contacting tip i, between which is placed the fuse-wire, and when in the fuse-holder A the sleeve makes connection with the ring 7L and the tip iwith the bolthead 12, and thus continues the cireuit from the branch bus-bar to the binding screw 17 but when the fuse has been deflagrated the circuit is interrupted and an air-gap formed between the bolt-head 12 and the ring it of the fuse-holder in a manner well understood.

I claim as my invention 1. A fuse-plug holder consisting of a holder portion, an intermediate portion, and a single foot portion, all of said portions being integral and made from sheet metal, the foot portion being provided with holes, the intermediate portion being provided with strei lgthening means, and the holder portion being perforated and internally threaded.

2. A fuse-plug holder stamped from sheet metal and having one end perforated and threaded and the opposite end formed with a foot having bolt-holes, the said ends being in parallel planes, and joined by an intermediate portion centrally hollowed or sunken to form supporting edges or sides.

3. A fuse-plug holder stamped from sheet metal and having one end perforated and a tubular portion turned down and internally threaded, the opposite end being formed as a foot having bolt-holes, the said ends being in parallel planes connected by an intermediate curved portion having its edges or sides bent at substantially right angles.

In testimony whereof I have signed my name to this specification, in the presence of two subscribing witnesses, this th day of February, 1905.

WILLIAM F. BOSSERT.

Witnesses FRANK G. SCOFIELD, FREDERICK T. FoXENBnnenn

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