US1119926A - Electric fuse-igniter. - Google Patents

Description

S. CLARK.

ELECTRIC FUSE IGNITER.

APPLICATION FILED mars. 1914.

Patented Dec. 8, 1914.

WITN ESSES:

UNITED STATES PATENT OFFICE.

SHERMAIT CLARK, OF COTTAGE GROVE, OREGQN.

. ELECTRIC FUSE-IGNITER.

To all whom it may concern:

Be it known that I, SHERMAN CLARK, a citizen of the United States, residing at Cottage Grove, in the county of Lane and State of Oregon, have invented. new and useful Improvements in Electric Fuse- Igniters, of which the following is a specification.

This invention relates to improvements in electric fuse igniters.

The objects of my improvements are,, first, to provide a simple, highly efficient form of fuse igniter which may be quickly and easily attached to the fuse and which is sufficiently substantial in construction to prevent its destruction, thus permitting it to be used over and over again; and, second, to provide a novel form of connection between the fuse and igniter which is watertight and which also serves the function of an automatic .disconnector when the fuse ignites.

The invention consists of the parts and the construction and combination of parts as hereinafter more fully described and claimed, having reference tothe accompanying drawings, in which Figure 1 is a perspective view. of the igniter F ig. 2 is a perspective view showing the several parts of'the igniter separated. Fig. 3 is a side elevation showing the fuse and igniter connected, the fuse and connector being shown partly in section.

Referring to the drawings, A indicates a round tapering shell of brass, copper, or any other suitable metal, on the larger end of whichis formed a pair of outwardly.

extending lugs 2. Insertible into the larger end of the shell is a holder 3, constructed of glass, porcelain, or other suitable insulating material. One end of this holder is tapered and flattened, as indicated at 4:,and is providedwith a groove 5 which connects with a larger semicircular groove 6 formed in the larger round end of the holder.

Groove 5 is provided as a seat for an ignition wire 7 which may be made of platinum, German silver, or like material, and the inner ends of said Wire extend up into the larger semicircular groove 6 and are here connected with two pieces of insulated copper wire as indicated at 8, of suitable size and gage. The ignition wire 7, together with the insulated sections 8, are first se curedtogetherand placed in position on the holder, as indicated in Fig. 2. The ends of Specification of Letters Patent.

Patented Dec. 8, 1914.

Application filed March 5,1914. Serial No. 822,566.

the insulated sections 8 are then inserted through the tapered tube A and the holder is inserted with the wires in the position indicated. The long end of the tube is then filled with a suitable form of cement, as indicated at 9, for the purpose of securing the holder, with connected wires, permanently in position within the tube. The lugs 2 may be furthermore slightly bent to decrease the large opening to such an extent that the holder could not possibly be removed.

The device assembled ready for use is shown in Fig. 1. This figure also shows the application of a piece of rubber tubing '10. This piece of tubing is slipped over the smaller end of the shell to the position indicated in Fig. 1 and is then doubled back on itself, in which position it is ready for use.

Connection between a section of fuse. and

the igniter is accomplished in the following manner: A suitable form of fuse is first split, as indicated at11, Fig. 2. The tapered separated. The current may then be turned on, causing the ignition wire to be instantly white hot. This will ignite the powder in the split fuse and cause same to burn. The ignition of the fuse at this point causes a discharge of smoke or gas from the burning powder and this creates a sufiicient pressure or force to disconnect the fuse from the igniter, or, in other words, blow it off. The igniter is thus automatically disconnected and may be pulled away from the danger zone, if so desired, by the lead wires.

An igniter constructed in the manner shown may be used over and over again, as it may be withdrawn from the danger zone the moment the fuse has become ignited.

The igniter may be connected with the lead wires in such a manner that one shot may be fired at a time or several instantaneously, that is, any number may be fired either in series or in rotation. The lead wires may be connected with any suitable source of electric power and can in-this instance be successfully used in connection with a storage battery or like device. It

thus becomes possible to eliminate the necessity of wiring the mine for this purpose, as the lead wires for a certain number of shots may be directly connected with the storage battery placed in any suitable position within the mine.

The device is simple in construction, perfectly safe and practical in its application, and is practically indestructible for the reasons before stated.

I wish it understood that various changes in form, proportions and minor details of construction may be resorted to within the scope of the appended claims, and that I do not wish to limit myself to the specific design and construction here shown.

The materials and finish of the several parts of the igniter are such as the judg ment and experience of the manufacturer may dictate.

Having thus described my invention, what I claim and desire to secure by Letters Patent is'- 1. In a fuse igniter, a tapered shell, a tapered holder of insulating material within the shell, an ignition wire on said holder, terminal wires in the shell with which the ignition wire is connected, and means for securing the holder within the shell.

2. In a fuse igniter, a tapered shell, a holder of insulating material within the shell, an ignition-wire on said holder, terminal wires in the shell with which the ignition wire is connected, means for securing the holder within the shell, and means for holding the ignition wire on the holder.

3.'In a fuse igniter, a shell, a holder of insulating material within the shell, an ignition wire on said holder, terminal wires in the shell with which the ignition wire is con nected, means for securing the holder within the shell, means for holding the ignition wire on the holder, and means for connecting the igniter with a fuse. I

4. In an electric fuse igniter, a tapered shell, a holder of insulating material within the shell, said holder being flattened and tapered at one end, an ignition wire on said holder, terminal wires in the shell with which the ignition wire is connected, means for securing the holder Within the shell, and means for holding the ignition wire on the holder. v

5. In an electric fuse igniter, a tapered shell, a holder of insulating material within the shell, said holder being flattened and tapered at one end, a groove formed in the holder extendingfrom end to end of same, an ignition wire in said groove, terminal wires in the shell with which the ignition wire is connected, means for securing the holder within the shell, and means for connecting the igniter with a fuse.

6. In an electric fuse igniter, a tapered shell, a holder of insulating material within the shell, said holder being flattened and tapered at one end, a groove formed in the holder extending from end to end of same.

an ignition wire in said groove, terminal wires inthe shell with which the ignition wire is connected, lugs formed on the end of the shell to lock the holder'within the shell,

and a rubber sleeve on the shell adapted to connect the igniter with a fuse, substantially as described.

7. An electric fuse igniter comprising a casing, a holder within the casing, a wedge shaped end on the holder for insertion between the split ends of a fuse, and means carried by the holder for igniting the fuse.

8. An electric r fuse igniter comprising a casing, a holder of insulated material within the casing, an igniting wire passing entirely around one end of the holder, and means for holding the fuse in contact with said igniting Wire. y

In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses.

SHERMAN CLARK.

Witnesses:

J. A. MCCULLY, L. A. CLARK.

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