초록 ▼

A cartridge has a case of an electrically non-conductive material. A head of the case is typically formed with a coaxial through bore seating a terminal assembly comprising an annular electrode within which is an annular insulator holding a central electrode. A spark gap is defined between inner end

A cartridge has a case of an electrically non-conductive material. A head of the case is typically formed with a coaxial through bore seating a terminal assembly comprising an annular electrode within which is an annular insulator holding a central electrode. A spark gap is defined between inner ends of the central electrode and annular electrode. The outer end of the central electrode terminates in a recess in the outer face of the head of the case in axially spaced relation to the outer end of the annular electrode. A hammer in operative association with the cartridge has spaced contact points in alignment with the annular electrode and central electrode, the contact points having the forementioned axial spacing. The entrance to the recess of the outer face of the head of the case is covered by an insulator which is displaceable by a boss on the opposed face of the hammer. Upon actuation of the hammer, the contact points penetrate the outer ends of the electrodes of the terminal assembly while the hammer boss is pierced by the central contact point and is displaced by the boss. In an alternative embodiment, the case may be made of a graphite composite and is externally coated with an insulator film.

대표청구항 ▼

In an electrically ignitable cartridge system having a case with a wall defining an internal chamber within said case for a propellant behind a projectile secured to an open end of said case opposite to said projectile, the improvement comprising: first and second electrical conductor means within s

In an electrically ignitable cartridge system having a case with a wall defining an internal chamber within said case for a propellant behind a projectile secured to an open end of said case opposite to said projectile, the improvement comprising: first and second electrical conductor means within said head of said case, each of said conductor means extending between inner and outer faces of said head of said case; first insulator means for electrically insulating said first and second conductor means from one another; said first conductor means having an outer end portion terminating within an external pocket formed in an outer face of said first insulator means whereby said outer end portion is recessed relative to said outer face of said head; a second insulator means in said external pocket that covers said outer end portion of said first conductor means to electrically insulate said outer end of said first conductor means from the ambient surroundings; said second conductor means having an outer end portion terminating at substantially a plane of said outer face of said head to be axially spaced form said outer end portion of said first conductor means; and hammer means in operative association with said outer end portions of said first and second conductor means for electrically interconnecting said first and second conductor means to an external electrical power source when said hammer means is actuated, said hammer means having a face in opposing relationship to said outer end portions of said first and second conductor means, said hammer face being fitted with first and second electrical contact means in operative alignment with said outer end portions of said first and second conductor means, respectively, said first and second contact means being axially spaced apart a distance substantially corresponding to the axial spacing between said outer end portions of said first and second conductor means; said second insulator means being made of a material that is penetrable by said first contact means of said hammer means, said outer end portions of said first and second conductor means being made of a material that is penetrable by said first and second contact means of said hammer means, respectively, to electrically energize said first and second conductor means when said hammer means is actuated.