US2022074724A1PendingUtilityA1

Polymer ammunition and cartridge having a convex primer insert

65
Assignee: TRUE VELOCITY IP HOLDINGS LLCPriority: Feb 14, 2019Filed: Nov 18, 2021Published: Mar 10, 2022
Est. expiryFeb 14, 2039(~12.5 yrs left)· nominal 20-yr term from priority
Inventors:Lonnie BurrowChristopher William Overton
F42B 5/307F42C 19/083F42B 5/313
65
PatentIndex Score
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Claims

Abstract

The present invention provides a primer insert for a polymer ammunition cartridge comprising: a top surface; a bottom surface opposite the top surface; a coupling element that extends from the bottom surface, wherein the coupling element comprises an interior surface and an exterior surface, wherein the interior surface comprises: a convex transition region that transitions from the bottom surface to a second segment wherein the transition region has an overall convex shape; a first segment extending from the second segment and terminates at a tip, wherein the first segment has a first segment distance from 0.02 to 0.18 inches and the second segment has a second segment distance from 0.02 to 0.18 inches, wherein the second segment has a second segment angle from +3 to −3 degrees relative to the first segment angle and the first segment has a first segment angle from +6 to −6 degrees from perpendicular to the top surface; a primer recess in the top surface that extends toward the bottom surface; a primer flash aperture positioned in the primer recess through the bottom surface; and a flash aperture groove in the primer recess and positioned around the primer flash aperture and adapted to receive a polymer overmolding through the primer flash aperture.

Claims

exact text as granted — not AI-modified
What is claimed is: 
     
         1 . A primer insert for a polymer ammunition cartridge comprising:
 a top surface;   a bottom surface opposite the top surface;   a coupling element that extends from the bottom surface, wherein the coupling element comprises an interior surface and an exterior surface, wherein the interior surface comprises:   a convex transition region that transitions from the bottom surface to a second segment wherein the transition region has an overall convex shape;   a first segment extending from the second segment and terminates at a tip, wherein the first segment has a first segment distance from 0.02 to 0.18 inches and the second segment has a second segment distance from 0.02 to 0.18 inches, wherein the second segment has a second segment angle from +3 to −3 degrees relative to the first segment angle and the first segment has a first segment angle from +6 to −6 degrees from perpendicular to the top surface;   a primer recess in the top surface that extends toward the bottom surface;   a primer flash aperture positioned in the primer recess through the bottom surface; and   a flash aperture groove in the primer recess and positioned around the primer flash aperture and adapted to receive a polymer overmolding through the primer flash aperture.   
     
     
         2 . The primer insert of  claim 1 , wherein the convex transition region is convex with a radius of between about 0.02 and 0.2. 
     
     
         3 . The primer insert of  claim 1 , wherein the convex transition region comprises one or more straight segments that form a convex segment that transitions from the bottom surface to a second segment. 
     
     
         4 . The primer insert of  claim 1 , wherein the convex transition region comprises one or more curved segments that form a convex segment that transitions from the bottom surface to a second segment. 
     
     
         5 . The primer insert of  claim 1 , wherein the convex transition region comprises one or more straight segments and one or more curved segments that form a convex segment that transitions from the bottom surface to a second segment. 
     
     
         6 . The primer insert of  claim 1 , wherein the first segment has a first segment distance is about 0.066 inches, the second segment has a second segment distance is about 0.072 inches and the convex transition region is convex with a radius of about 0.05. 
     
     
         7 . The primer insert of  claim 3 , wherein the second segment has a second segment angle is about 1 degrees and the first segment has a first segment is about 3 degrees. 
     
     
         8 . The primer insert of  claim 3 , wherein the second segment has a second segment angle is about 3 degrees and the first segment has a first segment is about 0 degrees. 
     
     
         9 . The primer insert of  claim 3 , further comprising an insert height that extends from the top surface to the tip, wherein the insert height is about 0.355 inches, 0.375 inches, or 0.395 inches. 
     
     
         10 . The primer insert of  claim 1 , wherein the first segment has a first segment distance is about 0.069 inches, the second segment has a second segment distance is about 0.069 inches and the convex transition region is convex with a radius of about 0.05. 
     
     
         11 . The primer insert of  claim 9 , wherein the second segment has a second segment angle is about 1 degrees and the first segment has a first segment is about 3 degrees. 
     
     
         12 . The primer insert of  claim 9 , wherein the second segment has a second segment angle is about 3 degrees and the first segment has a first segment is about 0 degrees. 
     
     
         13 . The primer insert of  claim 9 , further comprising an insert height that extends from the top surface to the tip, wherein the insert height is about 0.355 inches. 
     
     
         14 . The primer insert of  claim 9 , further comprising an insert height that extends from the top surface to the tip, wherein the insert height is about 0.375 inches. 
     
     
         15 . The primer insert of  claim 9 , further comprising an insert height that extends from the top surface to the tip, wherein the insert height is about 0.395 inches. 
     
     
         16 . The primer insert of  claim 1 , wherein the first segment has a first segment distance is about 0.063 inches, the second segment has a second segment distance is about 0.075 inches and the convex transition region is convex with a radius of about 0.05. 
     
     
         17 . The primer insert of  claim 13 , wherein the second segment has a second segment angle is about 1 degrees and the first segment has a first segment is about 3 degrees. 
     
     
         18 . The primer insert of  claim 13 , wherein the second segment has a second segment angle is about 3 degrees and the first segment has a first segment is about 0 degrees. 
     
     
         19 . The primer insert of  claim 13 , further comprising an insert height that extends from the top surface to the tip, wherein the insert height is about 0.355 inches, 0.375 inches, or 0.395 inches.

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