Pyrotechnic devices

Claim 2

A pyrotechnic device comprising a casing having an electrically-conductive wall, an electrically-operable ignition device in said casing for igniting a charge, said ignition device comprising a base, a first terminal disposed centrally within said base, a second terminal spaced from the first terminal and located, at least in part, on the periphery of the base, means electrically insulating the terminals from each other, an electric igniter head and means electrically connecting the igniter head to the first and second terminals, the base fitting within an opening in said electrically-conductive wall of the casing, and said second terminal making electrical contact with said wall, and a plug of solid adhesive material disposed within the inner end of said opening and adhering to the base and the said wall of the casing to seal the base to said wall of the casing to prevent escape of gases therebetween, to prevent the ignition device from being ejected from the casing under the shock loading resulting from ignition of said charge and to relieve the ignition device from at least part of said shock loading.

Claim 3

A pyrotechnic device comprising a casing having an electrically-conductive wall, an electrically-operable ignition device in said casing for igniting a charge, said ignition device comprising a base and an electric igniter head, the base comprising an electrically-conductive tubular member, a closure at one end of said tubular member, the closure comprising an annular electric insulator and a conductive terminal fitted within a central opening of the electric insulator, means conductively connecting the electric igniter head to said terminal and to said tubular member, the base fitting within an opening in said electrically-conductive wall of the casing, and said tubular member making electrical contact with the conductive wall, and a plug of solid adhesive material disposed within the inner end of said opening and adhering to the base and the said wall of the casing to seal the base to said wall of the casing to prevent escape of gases therebetween, to prevent the ignition device from being ejected from the casing under the shock loading resulting from ignition of said charge and to relieve the ignition device from at least part of said shock loading.

Claim 4

A pyrotechnic device comprising a casing having an electrically-conductive wall, an electrically-operable ignition device in said casing for igniting a charge, said ignition device comprising a base and an electric igniter head, the base comprising an electrically-conductive tubular member, a closure at one end of said tubular member, the closure comprising an annular electric insulator and a conductive terminal fitted within a central opening of the electric insulator, means conductively connecting the electric igniter head to said terminal and to said tubular member, the base fitting within an opening in said electrically-conductive wall of the casing, and said tubular member making electrical contact with the conductive wall, and a plug of solid adhesive material disposed within the inner end of said opening and adhering to the base and the said wall of the casing to seal the base to said wall of the casing to prevent escape of gases therebetween, to prevent the ignition device from being ejected from the casing under the shock loading resulting from ignition of said charge and to relieve the ignition device from at least part of said shock loading.

Claim 5

A pyrotechnic device according to claim 2 wherein the tubular member has a peripheral flange at its closed end, to abut against said wall of the casing.

Claim 6

A pyrotechnic device according to claim 1 wherein a sleeve formed integrally with said wall on the inside of the casing receives the base therein.

Claim 7

A pyrotechnic device according to claim 4 wherein said adhesive material has been applied over a surface of the sleeve so shaped that the resulting plug of adhesive material is tapered.

Claim 8

A pyrotechnic device according to claim 1 wherein said base comprises a body of electrically-insulating material.

Claim 9

A pyrotechnic device according to claim 1 wherein the means to prevent the ignition device from being ejected from the casing comprises a flange on the base in engagement with the inside of said wall of the casing.

Claim 10

A pyrotechnic device according to claim 1 wherein said electrically-conductive wall forms an integral end wall of an electrically-conductive tubular casing.

Claim 11

A pyrotechnic device according to claim 1 in the form of a flash cartridge wherein the casing is tubular and the said wall forms the end wall of the cartridge.

Claim 14

A method according to claim 10 wherein the plug is formed by a mass of epoxy resin or other hardenable adhesive which protects the ignition device from damage due to shock and prevents the ignition device from being ejected.

Claim 15

A pyrotechnic device comprising a casing having an electrically-conductive wall, an electrically-operable ignition device in said casing for igniting a charge, said ignition device comprising a base, a first terminal disposed centrally within said base, a second terminal spaced from the first terminal and located, at least in part, on the periphery of the base, means electrically insulating the terminals from each other, an electric igniter head and means electrically connected the igniter head to the first and second terminals, the base fitting within an opening in said electrically-conductive wall of the casing and said second terminal making electrical contact with said wall, and a solid mass of adhesive material extending around the periphery of the base in bonding contact with the base and the said wall of the casing to prevent the ignition device from being ejected from the casing under the shock loading resulting from ignition of said charge, the mass of adhesive material being in gas sealing relationship with the base and the said wall of the casing.

Claim 16

A pyrotechnic device comprising a casing having an electrically-conductive wall, an electrically-operable ignition device in said casing for igniting a charge, said ignition device comprising a base, a first terminal disposed centrally within said base, a second terminal spaced from the first terminal and located, at least in part, on the periphery of the base, means electrically insulating the terminals from each other, an electric igniter head and means electrically connected the igniter head to the first and second terminals, the base fitting within an opening in said electrically-conductive wall of the casing and said second terminal making electrical contact with said wall, and a solid mass of adhesive material extending around the periphery of the base in bonding contact with the base and the said wall of the casing to prevent the ignition device from being ejected from the casing under the shock loading resulting from ignition of said charge, the mass of adhesive material being in gas sealing relationship with the base and the said wall of the casing.