Advanced fragmentation hand grenade

Patent metadata

Field	Value
Publication number	US-9423228-B2
Application number	US-201414509386-A
Country	US
Kind code	B2
Filing date	Oct 8, 2014
Priority date	Jul 2, 2014
Publication date	Aug 23, 2016
Grant date	Aug 23, 2016

Abstract

A fragmentation structure is provided with improved performance e.g., fragmentation, projectile generation, storage, and manufacturing. An embodiment can include an open fragmentation structure that can be separated into individual components that can include a structure body section with a compartment, a removable initiator or detonator, a top cap section having an aperture configured to accept the removable initiator or removable detonator, and an explosive. An exemplary explosive can be preassembled to fit within the structure without a need for pouring in an explosive. An exemplary structure or top cap of the structure can receive an embrittlement treatment increasing its fragmentation characteristics. An ability of the structure to be easily disassembled allows for safer storage and a longer shelf life. A design of an exemplary embodiment of the structure allows it to be used with a wide range of explosive materials in addition to many types of removable initiators or detonators.

First claim

The invention claimed is:

1. A method of manufacturing an advanced fragmentation device comprising:
providing a removable detonator;
forming a device body having an interior compartment;
embrittling said device body by placing the said device body into a carbon rich and temperature controlled environment, allowing the device body to absorb carbon from a surrounding carbon rich and temperature controlled environment, and cooling the device body by a cooling agent to harden the device body;
forming a top cap having an aperture, wherein said top cap is configured to be coupled to said device body and said aperture is configured to be selectively coupled and retained to said removable detonator, wherein said aperture is formed to enable the removable detonator to be inserted through the top cap into the interior compartment of said device body;
determining a form and fit of the interior compartment of said device body and top cap and forming an explosive core according to said form and fit so as it can insert into said interior compartment of said embrittled device body and top cap, wherein said explosive core has a detonator well formed near the center of mass of said preassembled explosive core;
inserting said explosive core into said device body;
forming detonator well liner and placing detonator well liner in said detonator well;
selectively coupling and retaining said top cap to said device body; and
coupling said removable detonator to said top cap such that said removable detonator is selectively held with a first section extending away from said top cap and second portion extending into said detonator well of said explosive core.

2. The method of claim 1 , wherein the interior of said device body has a formed fragmentation pattern comprising areas of said body having a lesser structural strength than non pattern areas.

3. The method of claim 1 , wherein the exterior of said device body has a formed fragmentation pattern comprising areas of said body having a lesser structural strength than non pattern areas.

4. The method of claim 1 , wherein the coupling of said top cap to said device body is accomplished by press fitting them together.

5. The method of claim 1 , wherein the top cap has an interior compartment.

6. The method of claim 1 , wherein the aperture of said top cap is formed with a threaded section and said removable detonator has a threaded section.

7. The method of claim 1 , wherein after the forming of said top cap, the top cap is embrittled by placing the said top cap into a carbon rich and temperature controlled environment, allowing the top cap to absorb carbon from the surrounding carbon rich and temperature controlled environment, and cooling the top cap by a cooling agent to harden the top cap.

Assignees

• Us Navy
• The Us Scretary Of The Navy

Inventors

• Moan Brad
• Scheid Eric
• Allison Lucas
• Deshpande Nishkamraj

Classifications

• F42B33/04

  Fitting or extracting primers in or from fuzes or charges {(F42B33/004 takes precedence)} · CPC title

• F42B12/72

  characterised by the material (heat treatment for explosive shells C21D9/16) · CPC title

• F42B12/22

  with fragmentation-hull construction · CPC title

• F42C19/08

  Primers (initiators for blasting cartridges F42B3/10; ignition means for rocket engine plants F02K9/95); Detonators · CPC title

• F42B33/00

  Manufacture of ammunition; Dismantling of ammunition; Apparatus therefor (F42B5/188 takes precedence; manufacturing processes for hollow charges F42B1/036; manufacture of blasting cartridge initiators F42B3/195) · CPC title