Percussion-electric primer and radiation shield
阅读：535发布：2022-06-28
专利汇可以提供Percussion-electric primer and radiation shield专利检索，专利查询，专利分析的服务。并且A combined percussion-electric primer having an electrically insulated rimfire cap is centrally positioned at the rearward end of a cartridge, and an electromagnetic radiation shield having a weakened central portion adapted to yield upon firing pin impact is positioned rearwardly of the primer.，下面是Percussion-electric primer and radiation shield专利的具体信息内容。
1. In a cartridge having a base with a central longitudinal recess and a counterbore coaxial therewith defining a rearwardly facing annular surface therebetween, said cartridge having a percussion-electric primer comprising: a cup containing an electrically sensitive primer mixture, said cup having imperforate sidewalls formed into an integral wall at a rear end thereof, said sidewalls having a forward terminus defining an opening for communicating gases generated by said mixture with a cartridge contained propellant, said integral rear wall having a central aperture therein, a rimfire cap having a hollow shank and a peripheral flange with an annular cavity therein in communication with said hollow shank, said flange having a forward peripheral surface aligned with said cartridge base annular surface for substantially restraining forward relative movement therebetween upon impact by a firing pin on said flange, said hollow shank being secured within said cup rear wall aperture in fixed spaced relationship therewith, a percussively sensitive primer mixture positioned within said flange annular cavity, said electrically sensitive primer mixture positioned within said cap hollow shank in contact with said percussively sensitive mixture, and an electrical insulator positioned within said counterbore circumferentially around said rimfire cap, said insulator extending between said flange forward peripheral surface and said cartridge base annular surface with a portion thereof positioned intermediate said cap shank and said cup rear wall aperture, said insulator being arranged to insulate said cap from said cup and base so that a voltage applied between said cap and said base will initiate said electrically sensitive primer mixture and ignite said cartridge propellant.
2. The cartridge of claim 1 further including a disc-shaped electrically conductive shield having a weakened central portion arranged to yield upon impact by an insulated electric firing pin, said shield being slidably positioned in said cartridge base counterbore rearwardly of said cap and being in electrical contact with said base, said shield also having forwardly projecting means secured thereto and insulated therefrom aligned with said cap flange for contacting said flange upon a predetermined amount of pin forward movement, said shield adapted to conduct any stray electrical currents induced therein to said cartridge base, and means for limiting rearward movement of said shield.
3. The cartridge as recited in claim 2 wherein said shield completely overlies and is parallel to said cap flange, and said shield has integral forwardly extending peripheral wall means In slidable engagement with said cartridge base counterbore.
4. The cartridge of claim 3 wherein said shield forwardly projecting means includes a plurality of forwardly protruding pins positioned within and insulated from circumferentially spaced cavities located in said forwardly extending peripheral wall means.
5. In a cartridge having a base with an electrically initiated primer positioned within a recess therein, an electrically conductive electromagnetic radiation shield positioned within said recess rearwardly of said primer an insulated spaced distance therefrom, said shield completely overlying said primer and being in electrical contact with said cartridge base, said shield having an integral forwardly extending peripheral wall and a weakened central portion adapted to yield upon firing pin impact, and an annular electrical insulator positioned within said insulated spaced distance, said shield being arranged to protect said primer from electromagnetic radiation by conducting any stray electrical currents induced therein to said cartridge base.
6. The shield as defined in claim 5 wherein said shield weakened central portion has a plurality of diametral centrally intersecting notches, half of each notch length being less than the length of said forwardly extending peripheral wall measured longitudinally of said cartridge, said notches being arranged so that upon firing pin impact, the forwardmost notch defined weakened portions will yield and be deformed to positions spaced a predetermined distance from said primer for preventing short-circuiting of a primer electrical firing pulse applied to said pin.
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