Vibration resistant initiator assembly having exploding foil initiator
An initiator assembly that includes a housing, a base, an exploding foil initiator and an input charge assembly. The housing defines a cavity. The base coupled to the housing and closes the cavity. The exploding foil initiator is mounted to the base and has a barrel that defines an initiation axis. The input charge assembly is received in the cavity and includes a holder and an input charge. The holder has a first axial end and a second axial end that are spaced apart along the initiation axis. The first axial end is closer to an output of the barrel than the second axial end. A charge aperture is formed through the first axial end of the holder and does not extend through the second axial end of the holder. The input charge is formed of an explosive material and is received into the charge aperture.
1. An initiator assembly comprising:
a housing defining a cavity;
a base coupled to the housing and closing the cavity;
an exploding foil initiator mounted to the base, the exploding foil initiator having a barrel that defines an initiation axis;
an input charge assembly received in the cavity, the input charge assembly having a holder and an input charge, the holder having a first axial end and a second axial end that are spaced apart along the initiation axis, the first axial end being closer to an output of the barrel than the second axial end, wherein a charge aperture is formed through the first axial end of the holder and does not extend through the second axial end of the holder, the input charge being formed of an explosive material and received into the charge aperture.
2. The initiator assembly of claim 1 , wherein the explosive material is a secondary explosive.
3. The initiator assembly of claim 1 , wherein the cavity in the housing has a first cavity portion and a second cavity portion, wherein the first cavity portion is larger in diameter than the second cavity portion, wherein a first annular shoulder is formed on the housing where the first and second cavity portions of the cavity intersect one another, wherein the holder has a first holder portion and a second holder portion, wherein the first holder portion is larger in diameter than the second holder portion, wherein a second annular shoulder is formed on the holder where the first holder portion intersects the second holder portion, wherein the second holder portion is at least partly received in the second cavity portion, and wherein the first holder portion is received in the first cavity portion.
4. The initiator assembly of claim 3 , wherein the first and second annular shoulders are spaced apart from one another along the initiation axis.
5. The initiator assembly of claim 4 , wherein the cavity in the housing has a third cavity portion, wherein the first cavity portion is disposed along the initiation axis between the second and third cavity portions, wherein the third cavity portion is larger in diameter than the first cavity portion, wherein a third annular shoulder is formed on the housing where the first and third cavity portions intersect one another, wherein the base is received into the third cavity portion.
6. The initiator assembly of claim 5 , wherein a butt weld is disposed about the second holder portion that secures the second holder portion to the housing.
7. The initiator assembly of claim 6 , wherein the first axial end of the holder is flush with the second annular shoulder on the housing.
8. The initiator assembly of claim 5 , wherein an axial end of the base is flush with an axial end of the housing.
9. The initiator assembly of claim 5 , wherein a butt weld is disposed about the base that secures the base to the housing.
10. The initiator assembly of claim 1 , further comprising an output charge received in the cavity and disposed on a side of the holder that is opposite the input charge.
11. An initiator assembly comprising:
a housing having a housing member and a cover, the housing member having a first axial end and a second axial end, the housing member defining a cavity with a first cavity portion, a second cavity portion and a third cavity portion, the first cavity portion extending through the first axial end of the housing member, the third cavity portion extending through the second axial end of the housing member, the second cavity portion being disposed between the first and third cavity portions, the first cavity being larger in diameter than the second cavity portion so as to define a first annular shoulder on the housing member where the first and second cavity portions intersect one another, the second cavity portion being larger in diameter than the third cavity portion so as to define a second annular shoulder on the housing member where the second and third cavity portions intersect one another, the cover being fixedly coupled to the second axial end of the housing member to close an end of the cavity;
an output charge received in the third cavity portion, the output charge being at least partly formed of an explosive material;
an input charge assembly having a holder and an input charge, the holder being fixedly coupled to the housing member and having a first holder portion and a second holder portion, the first holder portion defining a charge aperture that does not extend fully through the holder, the second holder portion being smaller in diameter than the first holder portion, wherein a third annular shoulder is formed on the holder radially outwardly of where the second holder portion intersects the first holder portion, the first holder portion being received into the second cavity portion and located such that the third annular shoulder is spaced apart from the second annular shoulder on the housing member, the second holder portion being partly received in the third cavity portion, the input charge being received into the charge aperture and being formed of an explosive material;
a base/EFI assembly having a base, a plurality of terminals, and an exploding foil initiator, the base being fixedly coupled to the housing member, the terminals extending through the base and being electrically coupled to the exploding foil initiator, the exploding foil initiator being coupled to the base, the base/EFI assembly being slidably received into the first cavity portion and closing the cavity on a side of the housing member opposite the cover, wherein the base/EFI assembly is abutted against either an axial end of the holder or a barrier that is abutted against the axial end of the holder.