US1262463A - Fuse-plug. - Google Patents

Description

C L DICKSON.

FUSE PLUG\ APPLICATION FILED JULY 8, 1916. 1,262,463. Patented Apr. 9,1918.

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C L DICKSON, OF CHATTANOOGA, TENNESSEE.

FUSE-PLUG.

Specification of Letters Patent.

Patented Apr. 9, 1918.

Application filed July 8, 1916. Serial No. 108,225.

To all whom it may concern:

Be it known that I, C L DICKsoN, a citizen of the United States, residing at Chattanooga, in the county of Hamilton and State of Tennessee, have invented certain new and useful Improvements in F use- Plugs; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to new and useful improvements in fuse locks and the principal object of the invention is to provide a fuse lock which is so constructed as to pre* vent the theft of current.

It has been discovered that in a three wire system the loosening of one of the outer fuses while discontinuing its particular circuit will not affect the circuit through the opposite outer fuse but will stop the operation of the meter. In this way it will be seen that the power could be used without being registered and the object of the present invention is to provide a lock which is so constructed as to prevent the outer fuses from being loosened without the knowledge of the power company.

A still further object of the invention is to provide a novel form of lock for holding the fuses in place and preventlng thelr loosening or removal.

With these and other objects in view, the invention consists in the novel combination and arrangement of parts which will be fully set forth in the following specification and accompanying drawing, in which Figure 1 is a view showing the method of looking a plurality of fuses.

Fig. 2 is a side view of one of the fuses used in the construction illustrated in Fig. 1.

Fig. 3 is a side view of a fuse illustrating a modified form of lock, and

Fig. at is a view showing the method of locking the fuses such as are constructed in accordance with that illustrated in Fig. 3.

Referring to the drawing, the numeral 1 designates the main body of a fuse provided with the usual threaded contact shell 2. The central contact is designated by the numeral 3 and the contacts 2 and 3 are connected by the usual fuse wire (not shown). The plug 2 is provided with the plug cap 4 as in the ordinary way and this cap is provided with a central upstanding cylmdmcal portion 5 formed with a plurality of transversely distion of the sealing posed diametrical openings 6 for the recepwire. The sealing wire is designated by the numeral 7 and the fuses are tightened into their sockets as illustrated in Fig. 1 and then the openings 6 are arranged so that they aline in all of the fuses when the wire 7 is passed therethrough and twisted at 8 and a seal 9 is then pressed on the twisted portion s0 as to prevent the re moval of the wire and loosenin of any of the fuses WithOllt the knowle ge of the power company.

In the form of the invention illustrated in Fig. 3 the body of the fuse is designated by the numeral 10 and is provided with the usual externally threaded contact shell 11. The central contact of the fuse is designated by the numeral 12 and these contacts are connected by the usual fuse wire (not shown). The fuse cap is designated by the numeral 13 and is provided with a depending extending ear 14 which is provided with an internally screw threaded bore to receive the set screw 15 by means of which the cap is securely held in place. The head of the screw designated by the numeral 16 is provided with aplurality of transverse openings 17 which are arranged to be turned into alinement after the fuses are placed into position in the fuse box to receive the sealing wire 18. This wire is passed through the several screws as shown in Fig. 4 and the ends of the wire are intertwisted as at 19 and a seal 20 is then impressed over the ends of this wire to prevent any tampering with the fuses.

It will be apparent from the foregoing that in use the fuses are placed in the fuse block as illustrated in Figs. 1 and 4 and thus the circuit is completed. The connecting of the meter is such that upon loosening either of the outer fuses the circuit controlled by said fuse will, of course, be discontinued while the circuit through the opposite fuse will be unaffected, and yet the meter will not run. The passage of the sealing wires through their openings to lock the fuses against rotation will effectively frustrate any attempt to render the meter inoperative and thus the use of current from either of the circuits will be recorded and the possibility of defrauding the power company in this manner will be eliminated.

While in the foregoing there has been shown and described the preferred embodiment of this invention, it is to be understood that such changes may be made in the combination and arrangement of parts as will fall within the spirit and scope or" the appended claims.

What is claimed is 1. In a fuse plug adapted to be threaded into a fuse block, and having a cap, a set screw carried by the cap and projecting radially therefrom, the head of said screw being provided with a plurality of transverse openings and a sealing wire adapted to be passed through the openings in the heads of the screws carried by two separate plugs to prevent the plugs from being turned and loosened from their position in the fuse block.

2. In a fuse plug adapted to be threaded into a fuse block, and-having a cap, an ear depending from the cap, a set screw threaded through the ear and adapted to hold the cap in place the head of the set screw being provided with a plurality of transverse openings and a sealing Wire adapted to be passed through the openings in the screws of adjacent plugs to hold said plugs against rotation.

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