Abstract A booster for initiating relatively insensitive explosive compositions, and a process for manufacturing such boosters. In accordance with the process, a base is provided with at least one upstanding rod in the location at which an opening is desired in the booster for a fuse. A layer of relatively sensitive explosive material is placed around this rod, and an outer form having the cross-section desired of the finished booster is placed around the rod and explosive layer. A somewhat insensitive explosive material of high brisance is placed within the outer form and surrounding the relatively sensitive explosive material and allowed to harden to form the finished booster which thus comprises an outer layer of the somewhat insensitive explosive material and an inner layer of the more sensitive explosive material surrounding the fuse opening. A second rod can be provided to cause a second opening into the booster also contacting relatively sensitive explosive material. This second opening, for example, might accommodate a detonating cap. The layer of relatively sensitive explosive material can be provided in two or more lengths, if desired.
An explosive booster as claimed in claim 1 in which the cylindrical core is pentaerythritol tetranitrate.
Claim 2
Dependent Claim
15 words
An explosive booster as claimed in claim 2 in which the cylindrical sheath is TNT.
Claim 3
Dependent Claim
15 words
An explosive booster as claimed in claim 2 in which the cylindrical sheath is pentolite.
Claim 4
Dependent Claim
16 words
An explosive booster as claimed in claim 2 in which the cylindrical sheath is composition B.
Claim 5
Dependent Claim
20 words
An explosive booster as claimed in claim 1 in which the cylindrical sheath has a second perforation extending longitudinally thereinto.
Claim 6
Dependent Claim
38 words
An explosive booster as claimed in claim 1 in which the cylindrical core includes a second surface defining at least a portion of the circumference of the second perforation over at least a portion of the length thereof.
Claim 7
Dependent Claim
98 words
An explosive booster as claimed in claim 1 in which the first core portion has a length in the order of 1/2 inch, an outside diameter in the order of 1/2 inch, and an inside diameter in the order of 7/32nds inch, the second core portion has a length in the order of 1- 3/4 inches, an outside diameter in the order of 1/2 inch and an inside diameter in the order of 5/16ths inch, and the cylindrical sheath has a length in the order of 3-1/2 inches and a diameter in the order of 2- 1/2 inches.
Claim 8
Dependent Claim
32 words
An explosive booster as claimed in claim 1 in which the cylindrical sheath is enclosed within a casing having a threaded lower portion and an upper cap with a threaded internal recess.