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US 4,132,171 AGranted
Apparatus for detonating an explosive charge
OwnerDaniel E. Pawlak, deceased, by Cathy J. Pawlak, administratorinventors
Life of this patent
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OwnerDaniel E. Pawlak, deceased, by Cathy J. Pawlak, administratorinventors
Estimating the term…
A detonator having an open-ended metal jacket containing a small explosive charge remotely ignited through a pair of wires extending through one end of the jacket. The explosive charge projects toward one end of the jacket thereby forming an air gap between the explosive charge and the jacket. The air gap absorbs and attenuates the explosive shock so that relatively thin jacket walls are of sufficient strength to withstand detonation of the explosive charge, thereby making the detonator incapable of causing bodily injury. The detonator can be used to ignite a detonating cord by inserting the cord through the open end of the jacket into a jacket cavity until the explosive core of the cord contacts the projecting charge with the casing of the cord occupying the air gap to enclose the explosive charge. Alternatively, the detonator can be used as a conventional blasting cap by arming the cavity with a sufficient quantity of explosive material to rupture the jacket after the detonator has been set up to initiate an explosive charge. During transportation and handling, the cavity in the detonator is always empty and its open end is covered with a plug. The detonator is, therefore, inherently incapable of either causing injury or detonating another explosive charge.
A detonator for initiating fuse cord comprising a tubular jacket adapted to receive said fuse cord at an open end, said jacket enclosing an externally-detonatable explosive charge, said detonator further including isolating means for shock isolating said charge from said jacket such that the shock of said charge exploding is substantially dissipated before reaching said jacket to prevent rupturing the jacket, said isolating means being an air gap surrounding said charge along a substantial portion of the length thereof between said charge and jacket such that explosive shock is substantially dissipated within said air gap.
A detonator for initiating an explosive charge by placing said detonator in contact with said charge, comprising:
A detonator for initiating a fuse cord of the type having an explosive core comprising a tubular jacket having an open end adapted to receive said fuse cord, said jacket enclosing an externally-detonatable explosive charge projecting toward said open end from a charge supporting member, said charge having a transverse dimension no greater than the transverse dimension of the explosive core of said fuse cord and a shock isolating air gap surrounding said charge along a substantial portion of the length thereof between said charge and jacket when said charge is placed within said jacket thereby allowing the explosive shock of said charge to be dissipated within said air gap and allowing said charge to nest within said core when the end of said fuse cord abuts said charge-supporting member.
Dependencies are inferred from the claim text.