Safe-arm initiator
US5279226A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 4, 1992 |
| Grant date | Jan 18, 1994 |
| Priority date | — |
| Expiry date | Nov 4, 2012 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF42C15/188
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.