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Publication numberUS900670 A
Publication typeGrant
Publication dateOct 6, 1908
Filing dateMar 11, 1908
Priority dateMar 11, 1908
Publication numberUS 900670 A, US 900670A, US-A-900670, US900670 A, US900670A
InventorsThomas M Daniels
Original AssigneeThomas M Daniels
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Waterproof fuse-cap.
US 900670 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)

Patented Oct. 6, 1908.



warnnrnoor FUSE-CAP.

To all 207mm it ma i concern:

lie it known that I. THOMAS M. DANIELS, a citizen of the lTnitedStates, and a resident of Valdez, District of Alaska, have invented a new and Improved \Vate'rpr'oof Fuse-Cap, of which the following is a full clear, and exact description. i

This invention relates to fuse caps such as used for attaching an explosive cartridge to the end of -a fuse, which cartridge-is to be used in blasting in mining. V

The object of the invention is to produce a fuse cap of simple construction, which can be readily attached to the end of the fuse, and which will be substantially water-tight. The general purpose of the invention is to prevent the occurrence of miss-fires or miss-holes in blasting, which are due largely to the fact that the explosive in the cartri ge becomes wet. Such failures to'explode are the direct cause of many mine accidents.

The invention consists in the construction and combination of parts to be more fully described hereinafter and particularly set forth in the claims.

Reference is to be had to the accompanying drawings forming a part of this specification, in which similar characters of reference indicate'corresponding parts in all the Figure 1 is a side elevationof'the end of a fuse having a fuse cap constructed according to my invention; Fig. 2 is a view similar to Fig. 1, but showing the inner end of the fuse cap broken away and shown in cross section; this'view shows the fuse cap in the act of being appliedtothe fuse; Fig. 3 is a vertical section-through a portion. of the fuse and the inner end of the cap, and showing the cap clamped to the fuse; Fig.4 is an end view of the cap in its closed or clamped condition, the fuse being omitted; and Fig. 5. is a perspective showing a'portion of the forward edge or inner end of the fuse cap, and showing especially the manner .of forming the means for securing the cap to the fuse.

Referring more particularly to the parts, 1' represents the end of the fuse to which the fuse cap 2 is attached. This cap consists of a tube or cylinderprovided at its open end with a plurality of longitudinally disposed slits 4:. The inner end of the cap, that is, the end having the slits 4-, is turned outwardly so as-to form a crimp or crimped edge 5, as indicated most Specification of Letters Patent. Application filed. March 11, 1908.

3 closed at one end, and

Patented Oct. 6, 1908.

Serial No. 420,388.

-- clearly in Fig. Before turning the edge in this manner,- a part of the material of the crimped portion is struck inwardly so as to form a plurality of inwardly projecting I spurs or teeth (3. By reason of the slits L the inner end of the cap formed into a plurality of sections or leaves 7, and these leaves are slightly bent outwardly so that by their own resiliencythey tend to hold themselves in the outwardly inclined condition illustrated in Fig. 2.

On the cap there is mounted aflsliding ring or clamping ring 8. In applying the tube or shell 3' to a fuse, I slip over the end .of the fuse a sleeve 9, of rubber or similar material, which sleeve is considerably longer than the length of the slits 4'. as indicated in Fig. 2. The cap containing the cartridge is then slipped over the end of the fuse with the inner end sleeve 9. The clamping ring 8 is then forced to the inner end of the sleeve so that. it

presses the leaves 7 inwardly and clamps them against the sleeve 9. Forcing the leaves 7 inwardly in this manner presses the spurs 6 through the sleeve covering of the'fuse 1. In this way the cap becomes firmly attached to the body of the fuse.

A fuse constructed as described is substantially water-tight, as the sleeve 9" between the body of tube 3. The crimp the interior of the cap or limit the forward o"operates as a stop to 9 and into the outer of the fuse disposed at the w movement of the ring 8, and when the ring seats itself against this crimp, the tube or shell 3 will have become tightly attached to thefuse, as will be readily understood.

Having thus described my invention, claim as new and desire to secure by Letters Patent: I

1. A fuse cap having a cylindrical shell adaptedto contain an explosive cartridge, closed at one end and open at the other end the open end having longitudinally disposer slits dividing the inner end of said shell into sections, and "leans for clamping said sections inwardly upon 'the end of the fuse extending into said shell.

2. A fuse cap consisting of a'cylindrical shell closed at'one end and open at the other 7 end, the open end having longitudinally disadapted to force said spurs inwardly to clamp said shell upon the fuse.

3. A'fuse cap consisting of a shell having an open end and slits in the Wall thereof ex tending longitudinally at said open end, a sliding ring on said shell adapted to clamp the slit portion of said shell upon the fuse passing into said shell, and a sleeve of Waterproofing material disposed between said shell and the fuse and disposed under said slits, said sleeve affording means for excluding Water from the interior of said shell.

4. A fuse cap consisting of a cylindrical shell having a split open end receiving the fuse, said open end having spurs formed thereupon projecting inwardly, a clamping ring sliding on said shell and adapted to clamp said spurs upon a fuse extending into said shell, and a sleeve of waterproofing material adapted to surround the fuse and having a greater length than the split portion of said shell, whereby said sleeve excludes Water from the interior of said shell.

5. A fuse cap having an open end With a crimped edge, said open end having longitudinal slits formed therein and spurs projecting inwardly, and a sliding sleeve on said shell adapted to force said spurs inwardly to clamp said cap upon the fuse;

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


Witnesses W. '1. Basics, 0. AJVnLLs.

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2424374 *May 20, 1943Jul 22, 1947Ici LtdExplosive booster
US5710390 *Aug 1, 1995Jan 20, 1998Ofca; William W.Shock tube initiating system for display fireworks
Cooperative ClassificationC06C5/06