Initiating device and method for manufacturing such a device

Patent metadata

Field	Value
Publication number	US-10024642-B2
Application number	US-201415120894-A
Country	US
Kind code	B2
Filing date	Feb 26, 2014
Priority date	Feb 26, 2014
Publication date	Jul 17, 2018
Grant date	Jul 17, 2018

Abstract

An initiating device including at least one detonator, at least one booster charge and an action charge. The at least one booster charge is arranged such that, at the action charge initiates, the booster charge is free from disturbing edge effects that can have a disturbing effect on the action charge. A booster casing in which the booster charge is disposed is configured with a rear cylindrical part having a diameter D1, a front conical part delimited by a first circular limit face having the diameter D1, and a second circular limit face having a diameter D2, wherein the two limit faces are plane-parallel at a distance H1 from each other, wherein H1/D2 lies within a range 0.5-1.5. Also, a production method for producing the booster charge.

First claim

The invention claimed is:

1. An initiating device, comprising:
at least one detonator comprising a primary explosive;
at least one booster charge comprising a secondary explosive;
an action charge, wherein the at least one booster charge is arranged such that, as the action charge initiates, the booster charge is free from disturbing edge effects that can have a disturbing effect on the action charge; and
a booster casing in which the booster charge is configured with a rear cylindrical part having a diameter D 1 , a front conical part delimited by a first circular limit face having the diameter D 1 , and a second circular limit face having a diameter D 2 , wherein the two limit faces are plane-parallel at a distance H 1 from each other and wherein H 1 /D 2 lies within a range 0.5-1.5.

2. The initiating device according to claim 1 , wherein the detonator comprises a primary explosive comprising silver azide.

3. The initiating device according to claim 1 , wherein the booster charge comprises the secondary explosive comprising cyclotetramethylene-tetranitramine octogen (HMX).

4. The initiating device according to claim 1 , wherein the action charge comprises a secondary explosive comprising cyclotetramethylene-tetranitramine octogen (HMX).

5. The initiating device according to claim 1 , wherein the detonator is connected to the cylindrical part of the booster charge via an air gap, and wherein the diameter D 1 is equal to a diameter of the secondary explosive.

6. The initiating device according to claim 1 , wherein the secondary explosive of the booster charge is arranged with a gradually increasing density in the booster casing, calculated from the rear cylindrical part to the front conical part, wherein the density, in the rear cylindrical part, is at most 80% of a theoretical density of said secondary explosive and, in the front conical part, is at least 95% of a theoretical density of said secondary explosive.

7. The initiating device according to claim 1 , wherein the action charge is a directed explosive action (DEA) charge comprising a conical DEA liner.

8. A method for producing a booster charge comprising a secondary explosive, the method comprising:
loading the secondary explosive in a booster casing comprising a rear cylindrical part having a diameter D 1 , a front conical part delimited by a first circular limit face having said diameter D 1 , a second circular limit face having a diameter D 2 , and
loading the secondary explosive of the booster charge in the booster casing such that a density of the secondary explosive gradually increases, calculated from the rear cylindrical part of the booster casing to the front conical part of the booster casing.

9. The method according to claim 8 , wherein the secondary explosive of the booster charge is loaded in the booster casing via a pressing process with a hydraulic press, wherein a pressing time F T and a pressing force F p are chosen such that a density of the secondary explosive does not exceed at most 80% of a theoretical density of the secondary explosive in a rear cylindrical part of the booster casing, is at least 95% of a theoretical density of the secondary explosive in the front conical part of the booster casing, at a second limit face.

10. An initiating device, comprising:
at least one detonator comprising a primary explosive;
at least one booster charge comprising a secondary explosive, wherein the booster charge is arranged such that, in the initiation of an action charge, said booster charge is free from disturbing edge effects which can have a disturbing effect on the action charge, wherein said booster charge is disposed in a booster casing configured with a rear cylindrical part having a diameter D 1 , and a front conical part delimited by a first circular limit face having said diameter D 1 and a second circular limit face having a diameter D 2 , wherein said first and second circular limit faces are plane-parallel at a distance H 1 from each other and wherein H 1 /D 2 lies within the range 0.5-1.5, and wherein a secondary explosive of the booster charge is arranged with a gradually increasing density in the booster casing, calculated from the rear cylindrical part to the front conical part, wherein the density, in the rear cylindrical part, is at most 80% of the theoretical density of the secondary explosive and, in the front conical part, is at the least 95% of the theoretical density of the secondary explosive.

Assignees

• Saab Ab

Inventors

• Östlund Johan
• Edström Karl
• Persson Svante

Classifications

• F42C19/08

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

• F42B33/025

  by compacting (F42B33/004 takes precedence) · CPC title

• F42C11/00

  Electric fuzes ({in combination with other fuzes F42C9/14}; proximity fuzes F42C13/00; {safety or arming effected by electric means F42C15/40; electric contact parts for fuzes F42C19/06}; electric igniters F42C19/12, {F42B3/12 - F42B3/18; optical initiators F42B3/113}) · CPC title

• F42C19/02 Primary

  Fuze bodies; Fuze housings · CPC title

• F42C19/0807

  characterised by the particular configuration of the transmission channels from the priming energy source to the charge to be ignited, e.g. multiple channels, nozzles, diaphragms or filters · CPC title