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Publication numberUS2253549 A
Publication typeGrant
Publication dateAug 26, 1941
Filing dateJul 25, 1938
Priority dateJul 25, 1938
Publication numberUS 2253549 A, US 2253549A, US-A-2253549, US2253549 A, US2253549A
InventorsBarton Thomas E
Original AssigneeBarton Thomas E
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Blasting fuse anchor
US 2253549 A
Abstract  available in
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Description  (OCR text may contain errors)

26, 1941- T. E. BARTON BLASTING FUSE ANCHOR Filed July 25, 1958 I'NVENTOR.


Patented Au ze, 1941 'QUN ED if STATE PATENT orramis -z BLASTING FUSE ANCHOR Thomas E. Barton, Littleton, Colo. Application July 25, 1938, Serial No. 221,137

1' Claim. (Cl- 1022-43) This invention relates to a blasting fuse anchor,

that is, a device for anchoring a detonator or the firing extremity of a blasting fuse in an 1- explosive charge.

At presen dynamite is primed by unwrapping one extrem ty of the cartridge, inserting the capped fuse, and then tieing the wrapper about The principal object of this invention is to fangs l3 to the fuse in the usual manner, as shown at l2. When forced into dynamite cartridges such as indicated at II in Fig. 5, the fangs l3 expand therein to resist withdrawal of the fuse.

.Dynamite cartridges are wrapped in a rela-' tively stiff,-water-proof paper covering l5 which is folded inwardly at the extremities of the stick. The cap can be easily forced through the inwardly folded extremity of the wrapper and the latter will cooperate with the fangs 13 to prevent withdrawal of the cap and fuse.

provide automatic means for holding the fuse,

cap. or wires in place which eliminate unwrap? I ping the cartridge, tieing the fuse, or lacing the wires and yet; which will provide a positive and secure anchor for the fuse or detonator.

Other objects and advantages reside in the detail construction of the invention, which is designed for simplicity, economy, and efllciency.

.These'will become more apparent from the following description.

In the following detailed description of the invention reference is had to the accompanying drawing which forms a part thereof. Like nu- J merals refer to like parts in all views of the drawing and throughout the description.

In the drawing: I

Fig. 1- illustrates the invention combined as an integral part of the usual fuse cap.

I Fig. 2 illustrates the invention as an independent member used in combination with a fuse cap.

Fig. 3 illustrates the invention as applied to a fuse without the cap.

Fig. 4 ,is an end view of the anchor member taken on the line 4-4, Fig. 3.

Fig. 5 illustrates the combined cap and anchor in place in a dynamite stick.

Fig. 6 illustrates the anchor in place in a pellet powder cartridge.

In the drawing a typical blasting fuse is designated by the numeral ,l 0 and a typical blasting cap by the numeral It. The invention may be constructed, as illustrated, either as an independent device or as a part of the usual detonating blasting cap.

In Fig. 2, the improved anchor is illustrated as an independent member used in combination with the usual blasting cap it. This form of the device consists of a tubular sleeve H which may be crimped to the fuse, as shown at [8, by one of the usual cap crl npers or otherwise secured thereon. The sleeve I! is formedwith a series of locking fangs or tongues l9 similar to the previously described form. The independent form is inserted in the cartridge similarly to the combination form previously described. The independent form can also be used, however, with powder charges which do not require a detonating cap. In such a use, the sleeve I1 is crimped to the fuse, as shown in Fig. 3, and the extremity of .the fuse is forced into the powder cartridge where the fangs i9 expand to resist withdrawal thereof. It can also be used with loose powder poured in the drill hole since the fangs will prevent withdrawal of the fuse through the powder, tamping and wadding in the hole. It has also been found valuable for use with the cored powder or pellet powder cartridges, such as illustrated at 20 inFig. 6. 'The latter cartridge consists of a string of pressed powder cakes havin a central passage or core and wrapped in a wrapper 2|. To prime the cartridge the fuse is pushed through the end wrapping into the core of the cakes 20 where the fangs l6 expand to I engage the walls thereof and hinder withdrawal.

While the invention has been described as particularly applicable to blasting fuses,. it is .desired to be understood that in cases where electric blasting .capsor squibs areu'sed, the improved anchor can be applied to the ignition wires adjacent the cap similarly to its applicato snugly engage the fuse the latter can be forced through the sleeve and the latter will remain in position without the necessity for crimping. If-

made of metal a non-ferrous. non-spark-producabout the fuse Ill. The cap is crimped I ing metal should be used. Hard copper has been found very satisfactory.

While a specific form of the improvement has been described and illustrated herein, it is desired to be understood that the same may be varied, within the scope of the appended claim, without departing from the spirit of the invention.

Having thus described the invention, what is claimed and desired secured by Letters Patent is:

An integral self-anchoring blasting cap for fuses consisting of: a tubular metallic member closed at one extremity and open at the other;

detonating material in the closed'end of said member; said member having a circumferential constriction spaced a substantial portion of the length of the member from the open end to bear upon a fuse; said member having a plurality of spaced apart slits extending from the open end to a location adjacent the said constriction providing a plurality of fangs flared outwardly whereby to maintain the cap and associated fuse 10 within a blasting charge.


Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2535518 *Sep 25, 1948Dec 26, 1950Bickford Res Lab IncFuse igniting and connecting means
US2682221 *Jul 3, 1950Jun 29, 1954Air LiquidePriming device for liquid oxygen explosive cartridges
US2752849 *Oct 25, 1951Jul 3, 1956Du PontBlasting device
US4495867 *Jun 18, 1982Jan 29, 1985E. I. Du Pont De Nemours And CompanyAssembly for initiating explosives with low-energy detonating cord
US5123356 *Jun 27, 1991Jun 23, 1992Schlumberger Technology CorporationTransfer apparatus adapted for transferring an explosive train through an externally pressurized secondary explosive bulkhead
U.S. Classification102/275.9, 102/275.5, 102/275.12
International ClassificationF42B3/26, F42B3/00
Cooperative ClassificationF42B3/26
European ClassificationF42B3/26