# US 9,435,624 B2 · Safety arming system for an explosive charge

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- Number: US 9,435,624 B2
- Document ID: US9435624B2
- Status: Granted
- Kind: B2
- Application number: 14/399,338
- Filed: 2013-05-21
- Published: 2015-04-02
- Granted: 2016-09-06
- Earliest claimed: 2012-05-30
- Assignees: Mbda France
- Applicants: Mbda France
- Inventors: Patrick Barthelemy; Jean Caillard; Laurent Carton; Vincent Rafin
- Web page: https://patentgrep.com/patent/US9435624B2

## CPC

- F42D 1/04: Arrangements for ignition {(ignition systems for shaped charge perforators E21B43/1185; ignition devices for seismic energy generators G01V1/06)}
- F42C 15/184: using a slidable carrier
- F42C 15/188: using a rotatable carrier
- F42D 5/00: Safety arrangements
- F42D: BLASTING (fuses, e.g. fuse cords, C06C5/00; {for obtaining fluid from wells E21B43/00; for mining or quarrying E21C37/00; for making tunnels or galleries E21D9/006}; cartridges F42B3/00)
- F42C: AMMUNITION FUZES (blasting cartridge initiators F42B3/10; chemical aspects C06C); ARMING OR SAFETY MEANS THEREFOR (filling fuzes F42B33/02; fitting or extracting primers in or from fuzes F42B33/04; containers for fuzes F42B39/30)

## Abstract

The invention relates to a safety arming system for an explosive charge. According to the invention, the system comprises: an arming actuator (4) for moving a sleeve (19), supporting a detonator (20), from a fixed safety position to a fixed armed position; and a disarming actuator (5) arranged opposite the arming actuator (4) and capable of returning the sleeve (19) from the fixed arming position to the fixed safety position.

## Claims

### Claim 1

A safety arming system for an explosive charge, comprising:
a sleeve that carries a detonator for actuating said explosive charge and which, in a cylinder, is able to move between a fixed safety position in which the detonator is away from said explosive charge, and a fixed arming position in which said detonator is aligned with said explosive charge;
an arming actuator for moving said sleeve from said fixed safety position to said fixed arming position;
a disarming actuator arranged opposite said arming actuator with respect to said cylinder, able to return said sleeve from said fixed arming position to said fixed safety position; and
a jacket inside said cylinder, inside which said sleeve is able to move, under the action of said arming actuator, from said fixed safety position to said fixed arming position until it is secured to said jacket, in said fixed arming position, by virtue of spontaneous securing means, and which is able, under the action of said disarming actuator, to slide in said cylinder in order to return said sleeve, which has thus become spontaneously fixed thereto, from said fixed arming position to said fixed safety position.

### Claim 2 (depends on 1)

The system according to claim 1, wherein said spontaneous means of connection between said sleeve and said jacket are of the resilient segment and annular groove type.

### Claim 3 (depends on 1)

The system according to claim 1, further comprising:
a first breakable connection, between said sleeve and said jacket, able to be broken by the action of said arming actuator;
a second breakable connection, between said jacket and said cylinder, able to be broken by the action of said disarming actuator; and
a stop system able to prevent said jacket from moving to the arming position under the action of the arming actuator.

### Claim 4 (depends on 3)

The system according to claim 3, wherein said stop system able to prevent said jacket from moving to the arming position under the action of said arming actuator is of the resilient segment and annular rib type.

### Claim 5 (depends on 4)

The system according to claim 4, wherein said blocking means use the resilient segment of said stop system of said jacket.

### Claim 6 (depends on 1)

The system according to claim 1, wherein, when under the action of said disarming actuator said jacket has slid in said cylinder in order to return said sleeve from said fixed arming position to said fixed safety position, the position of said jacket fixed by locking means.

### Claim 7 (depends on 1)

The system according to claim 1, wherein, in said safety position before arming, the axis (I-I) of said detonator is orthogonal to the axis (L-L) of said explosive charge and means for rotating the sleeve inside the jacket are provided so that, when said sleeve moves under the action of said arming actuator, the axis (I-I) of said detonator comes, in said fixed arming position, to coincide with the axis (L-L) of said explosive charge.

### Claim 8 (depends on 1)

The system according to claim 1, wherein, in said arming position, the axis (I-I) of said detonator being merged with the axis (L-L) of said explosive charge, means for rotating said jacket inside the cylinder are provided so that, when said jacket moves under the action of the disarming actuator, the axis (I-I) of said detonator adopts, in said fixed safety position, an orientation orthogonal to the axis (L-L) of said explosive charge.

### Claim 9 (depends on 1)

The system according to claim 1, wherein at least one of the two actuators is an electrically controlled gas generator.