초록 ▼

A pair of explosive detonators are recessed in the end of a cylindrical body containing a permanent magnet, which serves as the rotor in a brushless, bi-directional torque motor enclosed in a housing. A reversible positioning current causes the motor to rotate the body between armed and safe positio

A pair of explosive detonators are recessed in the end of a cylindrical body containing a permanent magnet, which serves as the rotor in a brushless, bi-directional torque motor enclosed in a housing. A reversible positioning current causes the motor to rotate the body between armed and safe positions and thereby establish and interrupt axial explosive transfer paths from the detonators to a corresponding pair of explosive transfer lines ported through the housing cover. An internal switching circuit disables the detonators when the body is in the safe position and passes a firing current to them when the body is in the armed position. A detent ring secured to the rotatable body, and a pair of spring-loaded detents in the housing index the rotatable body in the armed and safe positions and prevent its accidental rotation. Mechanical safing means are provided for manually overriding an electrical arming signal.

대표청구항 ▼

A safe-arm firing type explosive initiator, comprising: a housing having a generally cylindrical bore therein and a cover; a pair of diametrically spaced explosive transfer passages extending axially through said cover and communicating with an explosive transfer line; a torroidal stator fixed in sa

A safe-arm firing type explosive initiator, comprising: a housing having a generally cylindrical bore therein and a cover; a pair of diametrically spaced explosive transfer passages extending axially through said cover and communicating with an explosive transfer line; a torroidal stator fixed in said housing; a generally cylindrical rotatable body containing a diametrically disposed magnet and a pair of axially disposed detonators corresponding with said transfer passages, said rotatable body being mounted for concentric rotation within said stator between an armed position in which said detonators are in operative axial alignment with said passages and a safe position in which said detonators are arcuately displaced out of operative alignment with said passages; electrical circuitry contained in said housing, said circuitry including a firing circuit and a positioning circuit, said positioning circuit including electrical windings around said stator; first switch means responsive to an electrical firing command signal for selectively connecting said firing circuit with a power supply and thereby firing said detonators when said rotatable body is in said armed position; second switch means responsive to rotation of said rotatable body for disconnecting said firing circuit and said first switch means and grounding said firing circuit when said rotatable body is in said safe position; third switch means responsive to an electrical positioning command signal for selectively connecting said positioning circuit and said power supply and thereby inducing rotation of said rotatable body; first detent means on said rotatable body; and second detent means in said housing, said first and second detent means cooperating, when engaged, to urge said rotatable body into said safe and armed positions, and releasably and resiliently to retain said rotatable body in said positions.