US 954595 A
Description (OCR text may contain errors)
C. F. SPERY.
MINERS FUSE GAP.
APPLICATION FILED DBG. a, 1909.
Patented Apr. 12, 1910.
www @my 3f Ww "impervious to water.
CHARLES F. SPERY, 0F CHICAGO, ILLINCIS.-
.Specication of Letters Patent. Patented App', 12, 191),
Application, led- December 3, 1909. Serial No. 531,225.
To all whom it may concern.:
Be it known that I, CHARLES F. SPERY, a. citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements'in Miners Fuse-Caps, of which the following is a description, reference being had to the accompanying drawings, formingn a part ofthis specification, in which corresponding characters of reference in the different figures indicate like parts.
The object of my-invention is to' provide a simple, cheap and eifective waterproof fusecap, such as is ordinarily employed by miners and others for igniting explosive charges in mines Lor quarries,-all of which is here# inafter more particularly described and defi? nitely pointed out in the claims.
In'the drawings, Figure 1 is an elevation of a fuse-cap embodying the features of my invention, as it would appear when attached to a fuse; Fig. 2 is a central vertical sectional view thereof; Fig. 3 is a transverse sectional view in plan taken upon the line 3 3, Fig. 1, and Figs. 4, 5, 6 and 7 are central longitudinal sectional views showing modications of said invention.
Referring to the drawings, 1, indicates the main body of a shell or casing, preferably formed from-copper or other metal or metallic alloy, said casing being closed at one end and open at the other.` An explosive material 2 is intended to be placed within the receptacle to be ignited b means of the usual fuse 3, the end of w ich is arranged to cont-act therewith.
The body of the casing is enlarged near its open end asshown at 4 thereby forming an inclined portion 5, which results in an internal shoulder adapted. to form a seat for a packing ring 6 of rubber or other suitable elastic packing material of a nature which is Extending from the outer end'of the enlarged portion toward the packing seat arescrew-threads 7 which, by-
preference, surround only a port-ion of the circumference of the shell, as clearly shown in Figs. 1 and 3, leaving portions 8 without threads, of the Vfull diameter of the enlarged cylindrical portion below. This constructionuenables the threads to be formed without injurious distortion of the metal, while permitting the packing to be more readily inserted.
An annular nut, generally designated 'by 9, is provided with a screw-threaded portlon 10 adapted to enter the annular `space around the fuse andl force the packing 6 against the shoulder. An enlarged. portion 11, having a knurled periphery, is formed.4
upon the nut to enable it to be adjusted. When the nut is screwed firmly into place the packing 6 iscaused to expand laterally thereby forming a water-tight joint around the` fuse. the nut which enters the shell should be long enough to enable the, packing to be thoroughly compressed without causing the shoulder of theenlarged portion to abut against the end of the casing.
In Fig. 4 I have shown a modified con-v struction in which the threaded portionl 10 extends-to thepacking shoulder and is circumferential] continuous..
In Fig. 5 t e entire casing is of uniform diameter and the packing seat is formed by means of a peripheral groove 13. In Fig. 6 astill further modification is shown,1n which the shell or container is made in two parts 14 and 15 respectively. The part 14, which is the explosive container, is ared outwardly at the top as shown at 16, while the enlarged part 15 is.
made with an inwardly tapered ortion 17 adapted to it over the part 16,' wliich latter forms a packing seat.
In Fig. 7 I have shown a modification in which the nut 18 is provided with 'an interior. thread,- an interior annular shoulder 19, while the upper end 20 of the container is constructed to form a seat'21 for the packing ring 6.
I-Iavlng t us described my invention, I claim: e,
1. A fuse-cap in which is combined a shell for receiving an ignition charge, said shell being o en at one end forthe insertion of 'a fuse an provided with an internal annular shoulder near said open end, an annular nut arran ed to t within Asaid ca and an annular e astic packing' interpose between said nut and shoulder to form a water-tight joint between the shell and a fuse when compressed by the nut. A
2. A fuse-cap comprising a receptacle adapted to hold an explosive charge, said receptacle having an o enin therein for the insertion of a fuse, a s oul er in said opening to form a seat for an annular elastic aekin a screw-threaded portion extendin rom t e outer end of the opening towar said seat, and an annular nut having a por- It'is obvious that the portion of tion adapted to enter said opening to'cominternal packing-chamber with a seat for packing, a portion between the end and said seat having threaded' sections formed in parts only of .the circumference, and an annular nut adapted to enter` said open end, said nutbeing' provided with suitable threads for engaginof said sections.
4. A device of tle class described, in which is combined a receptacle for holding an explosivecharge, said receptacle beingl onen at one end for the insertion of a fuse,
a shoulder withnsad opening to form a' packing seat, an annular elast-ic packing, a use inserted `within said opening, the same being surrounded with said packing, and an annular nut having a portion exten ed with- 1n said opening to compress saidpacking against -said'fuse.
In testimony whereof, Ifhave signed f lspecification in the presenceoftwo subscribrst day of December Witnesses:
D. H. FLETCHER, CARRIE E. JORDAN.
CHARLES F. SPERY,y