Primer for electric and percussion fuses for cartridge ammunition

Claim 2

A primer for electric and percussion priming for use in accordance with the spark-gap principle which comprises a metallic capsule provided with a closed bottom, an electrically conductive thrust ring disposed inside of the metallic capsule, insulating means for completely insulating the thrust ring from the metallic capsule, and a gap charge provided inside the thrust ring and adjacent the closed bottom of the metallic capsule, the metallic capsule and the thrust ring being arranged for connection with electrical means such that the metallic capsule acts as a first lead electrode to the gap charge and the thrust ring acts as a second lead electrode for the gap charge.

Claim 3

The primer of claim 1, wherein the metallic capsule is provided with a flange which holds the thrust ring inside said capsule, said flange and said thrust means being separated by insulating means.

Claim 4

The primer of claim 2, wherein a primer charge is provided adjacent the gap charge and an anvil is disposed inside the thrust ring as an abutment for the percussion priming means. 4. The primer of claim 3, wherein the anvil is connected with the thrust ring by flange means.

Claim 5

The primer of claim 3, wherein the anvil is screwed into the thrust ring by means of a thread means.

Claim 6

The primer of claim 1, further comprising a metallic propellant charge case containing a propellant charge and having said metallic capsule disposed therein, further insulating means for insulating said metallic capsule from the metallic case, and said thrust ring providing the electrical connection to the propellant charge case.

Claim 7

A primer for electric and percussion priming for use in accordance with the spark-gap principle which comprises a shell-like metallic capsule provided with a closed bottom and a flanged open end, an electrically conductive thrust ring annularly disposed inside of the metallic capsule and adapted to be held in position by said flanged portions, insulating means for completely insulating said thrust ring from the bottom, sidewalls and flange portion of the metallic capsule, a gap charge provided inside the thrust ring and adjacent the closed bottom of the metallic capsule, a primer charge provided inside the thrust ring and adjacent the gap charge and an anvil disposed inside the thrust ring as an abutment for the percussion priming means, said metallic capsule and said thrust ring being arranged for connection with electrical means such that said metallic capsule and said thrust ring serve as the two lead electrodes to the gap charge.

Claim 8

A primer for electric and percussion priming for use in accordance with the spark-gap principle which comprises a shell-like metallic capsule provided with a closed bottom and a flanged open end, an electrically conductive thrust ring annularly disposed inside of the metallic capsule and adapted to be held in position by said flanged portions, insulating means for completely insulating said thrust ring from the bottom, sidewalls and flange portion of the metallic capsule, a gap charge provided inside the thrust ring and adjacent the closed bottom of the metallic capsule, a primer charge provided inside the thrust ring and adjacent the gap charge and an anvil disposed inside the thrust ring as an abutment for the percussion priming means, said metallic capsule and said thrust ring being arranged for connection with electrical means such that said metallic capsule and said thrust ring serve as the two lead electrodes to the gap charge.

Claim 9

The primer of claim 7, wherein the primer charge is provided with a hemispherical element into which the anvil extends.

Claim 10

The primer of claim 8, wherein the primer charge is provided with a metal or paper cover.

Claim 11

The primer of claim 7, wherein the gap charge contains lead trinitroresorcinate containing as an electrically conductive means an effective amount of graphite or carbon black.

Claim 12

The primer of claim 10, wherein said gap charge further contains about 2 to 3 percent tetrazene, and a friction agent selected from the group consisting of powdered glass, calcium silicide or antimony sulfide.

Claim 13

The primer of claim 11, wherein the primer charge contains a mixture of lead dioxide, calcium silicide and barium nitrate.

Claim 14

The primer of claim 7, further comprising a metallic propellant charge case containing a propellant charge and having said metallic capsule disposed therein, further insulating means for electrically separating said metallic capsule from the metallic case, and said thrust ring providing the electrical connection to the propellant charge case.

Claim 15

The primer of claim 7, wherein the anvil is connected with the thrust ring by a flange means.