초록 ▼

A device for application in the art of blasting, by the use of nonelectric devices, and the new concept that employs pyrotechnic mixtures and combinations thereof which are distributed in granular form throughout the inside of a supporting tube. The pyrotechnic mixture applied to the supporting tube

A device for application in the art of blasting, by the use of nonelectric devices, and the new concept that employs pyrotechnic mixtures and combinations thereof which are distributed in granular form throughout the inside of a supporting tube. The pyrotechnic mixture applied to the supporting tube having been subjected to a suitable mixing process to ensure cohesive properties so that the mixture will adhere in the proper manner to the inside surface of the supporting tube, and will allow for great flexibility in the density of the surface charge, in addition to allowing for the use of a vast range of chemical substances, as well as the secondary use of these devices as retarder units.

대표청구항 ▼

A non-electric fuse device for initiating explosives comprising: an elongated hollow duct having entrace and exit ends and an inner annulus having a dimension of from about 0.5 mm to about 10 mm, and containing on the interior surface thereof; a coating, comprising a pyrotechnic mixture made up of

A non-electric fuse device for initiating explosives comprising: an elongated hollow duct having entrace and exit ends and an inner annulus having a dimension of from about 0.5 mm to about 10 mm, and containing on the interior surface thereof; a coating, comprising a pyrotechnic mixture made up of at least three members selected from the group consisting of potassium bichromate, vanadium pentoxide potassium permanganate, sugar, lead oxide, aluminum, silicon and amorphous boron and combination thereof which when present in said coating are bonded to the said inner surface of said hollow duct; said coating mixture having a coverage of from between about 1×10-2 to about 4×10-5 gm/cm2 and a burn rate when fired at said entrance end of from between about 500 meters per second to about 1200 meters per second along the interior of said duct whereby explosives placed at said exit end of said duct can be initiated by the products of said pyrotechnic combustion leaving said exit end.