Dual fault safe and arm device, adaptive structures therewith and safety and reliability features therefor
View Patent ↗A safe and arm device includes a booster base assembly having a booster base housing and a barrier. The booster base housing includes a shaft port extending substantially in line with a longitudinal axis, at least three initiator ports disposed about the axis, and a matching number of explosive transfer paths in respective communication with the at least three initiator ports. The barrier includes a matching number of fire-train transfer ports and a drive shaft. The drive shaft of the barrier is coupled within the shaft port of the booster base housing allowing the barrier to be selectively rotationally positioned about the axis into at least one of a safe position and an arm and fire position, allowing the fire-train transfer ports to be substantially aligned with the explosive transfer paths when the barrier is positioned in the arm and fire position. A booster basket assembly is also provided.
1. In a safe and arm device, a booster basket assembly comprising:
a basket housing, the basket housing comprising:
an axis;
a substantially cylindrical, substantially solid wall having at least one recess therein extending about the axis having a substantially closed end to form a cavity therein, wherein the cavity is configured to house a combustible material;
one or more explosive transfer path ports coupled through the substantially closed end, wherein the one or more explosive transfer path ports are configured to align with the safe and arm device to enable propagation of an energy wave into the cavity when the safe and arm device is in an armed position; and
an annular flange extending radially from an open end of the substantially cylindrical, substantially solid wall;
a cover comprising a plurality of perforations configured to enable energy to be expelled from the basket housing during combustion of the combustible material; and
a plurality of fasteners, each having a portion extending through the cover into the annular flange of the basket housing, wherein the cover is fixedly coupled to the annular flange of the basket housing by the plurality of fasteners.
2. The booster basket assembly of claim 1 , further comprising a combustible material housed within the cavity.
3. The booster basket assembly of claim 2 , wherein the combustible material comprises BKNO 3 pellets.
4. The booster basket assembly of claim 1 , further comprising a rupture disc coupled in each of the one or more explosive transfer path ports.
5. The booster basket assembly of claim 4 , wherein the rupture disc comprises a disc for rupturing by a pressure wave from an initiator.
6. The booster basket assembly of claim 1 , wherein the cover comprises a flat plate including the plurality of perforations for directing a gas of the combustible material in an axial direction.
7. The booster basket assembly of claim 1 , further comprising an alignment feature in the annular flange of the basket housing radially corresponding about the axis to one of the one or more explosive transfer path ports.
8. The booster basket assembly of claim 7 , wherein the alignment feature comprises a port.