EP0068534B1 - Safety means for a fuze of a spin-stabilised projectile - Google Patents

Description

• - einen kugelförmigen Rotor, der sich aus einer Sicherheitsstellung in eine armierte Stellung drehen läßt,
• - einen Lagerkörper und eine Führungsscheibe, zwischen denen der Rotor drehbar gelagert ist,
• - eine erste ringförmige Nut im Lagerkörper, die sich in einer zur Geschoßachse senkrechten Ebene befindet,
• - eine zweite ringförmige Nut im kugelförmigen Rotor, die sich in der Sicherheitsstellung des Rotors in einer zur Geschoßachse senkrechten Ebene befindet,
• - eine Sicherungsfeder in Form einer ringförmigen Scheibe, die sowohl in die erste Nut, als auch in die zweite Nut hineinragt zur Sicherung des Rotors in seiner Sicherheitsstellung, und die durch die Abschußbeschleunigung und durch den Drall deformierbar-ist, zur Freigabe des Rotors in seine armierte Stellung.

The invention relates to a safety device for a swirl projectile detonator containing

• a spherical rotor which can be turned from a safety position into an armored position,
• a bearing body and a guide disk, between which the rotor is rotatably mounted,
• a first annular groove in the bearing body, which is located in a plane perpendicular to the axis of the projectile,
• a second annular groove in the spherical rotor, which is in the safety position of the rotor in a plane perpendicular to the projectile axis,
• - A locking spring in the form of an annular disc, which protrudes both into the first groove and into the second groove to secure the rotor in its safety position, and which is deformable by the launch acceleration and by the swirl, to release the rotor in its armored position.

A known time delay igniter of this type according to US-A-3 595 169 contains a spherical rotor which is rotatably mounted in a cavity of the igniter housing. The firing pin, this cavity and the booster charge are on the igniter axis. The rotor contains a primer in a through bore of the rotor and a disk-shaped ring which projects into a groove in the rotor holds the rotor with the primer in a safety position. To release the rotor into its armored position, the disk-shaped ring must be flattened by the launch acceleration and expanded by the swirl.

However, this known locking ring does not ensure sufficient transportation security. If vibrations occur during the transport of the projectiles provided with such detonators, it can happen that the rotor turns into its arming position.

A known securing device for swirl projectiles of this type according to the German designation 2 539 750 contains a horseshoe-shaped securing element which can already be deformed by the swirl to such an extent that the rotor can be turned into its armored position. Such a security element does not meet the security requirements that are often placed on such security devices.

The object of the present invention is to create a safety device which corresponds to the safety regulations, i. H. that the security element should only release the rotor when two independent forces, e.g. B. launch acceleration and swirl act on the security element. In addition, a reliable transport lock must be guaranteed.

The safety device according to the invention is characterized in that the annular disc (31) is divided into segments (34-39) by incisions (32, 33), the successive segments (34-39) being directed alternately upwards and downwards in a wave shape.

• Fig. 1 einen Längsschnitt durch einen Bodenzünder in gesicherter Stellung,
• Fig. 2 eine Ansicht einer Sicherungsfeder von oben und
• Fig. 3 eine Ansicht derselben Sicherungsfeder von der Seite.

An embodiment of the safety device according to the invention is described in detail below with reference to the drawing. It shows

• 1 shows a longitudinal section through a floor igniter in a secured position,
• Fig. 2 is a view of a locking spring from above and
• Fig. 3 is a view of the same locking spring from the side.

1, the base igniter has an essentially cylindrical housing which can be screwed into an unillustrated projectile body of a swirl bullet with an external thread 11.

In this housing 10, a bearing body 12 is screwed into a bore 13 which has a shoulder 14 on which a guide sleeve 15 is supported. On this guide sleeve 15 is a guide disk 16, which is pressed by the bearing body 12 against the guide sleeve 15, so that the parts mentioned are fixed in the housing 10. A hammer sleeve 17 is slidably guided with its lower part in the guide sleeve 15 and with its upper part in the guide disc 16. An ignition pin 18 is attached to the upper part of the hammer sleeve 17. In the bearing body 12 there is a spherical rotor 19 which contains a primer 20. The rotor 19 can be turned by the swirl from the safety position shown into the arming position. A booster charge 21 is also fastened to the bearing body 12 and protrudes into the explosive charge (not shown) of the projectile body.

A disassembly spring 22 is supported on the one hand on the bottom of the housing 10 and on the other hand on the hammer sleeve 17 and strives to push the hammer sleeve 17 against the primer 20 with the firing pin 18. This displacement is prevented by a number of locking bodies 23 which are supported on the one hand on the guide disk 16 and on the other hand on a shoulder 24 of the hammer sleeve 17. A bolt 25 is located inside the disassembly spring 22 and is used to guide it. The segment-shaped locking body 23 are held together by a centrifugal force band 26, which consists of a thin metal foil and is wound around the locking body 23. Furthermore, the displacement of the hammer sleeve 17 is prevented by spherical centrifugal bodies 27, which are located in radial bores 28 of the hammer sleeve 17 and are supported on the inside of the guide sleeve 15 under the action of the swirl on a conical surface 29 Zen. An inertial body 30 is arranged behind the hammer sleeve 17 in the housing 10.

According to the invention, there is still a securing spring 31 in the form of an annular disk below the rotor 19, by means of which the rotor 19 is secured against rotation into its armed position before the projectile is fired.

The shape of this disc 31 can be seen in FIGS. 2 and 3. 2 and 3, an annular disc 31 is divided into three segments 34, 35, 36, 37, 38, 39 by three inner incisions 32 and two outer incisions 33, the disc 31 being open at point 40. Viewed from this point 40, the segments 38 and 39 in FIG. 2 are directed upwards. The subsequent segments 36 and 37 are inclined downwards and finally the last two segments 34 and 35 are directed upwards again. By the incisions 32 and 33, the securing spring 31 is weakened so that the six segments mentioned can lie flat in one plane due to the launch acceleration and that the open ring can expand due to the swirl.

1, the spherical rotor 19 has an annular groove 41 into which the annular locking spring 31 projects. In addition, the bearing body 12 has a groove 42 which is expanded in the lower region of the locking spring 31 so that the locking spring can expand in the radial direction as soon as it is pressed flat.

• Beim Abschuß des nicht dargestellten Geschosses wird durch die Abschußbeschleunigung die Sicherungsfeder 31 flach gedrückt und liegt an der Führungsscheibe 16 an. Ferner wird durch den Drall die Sicherungsfeder 31 aufgeweitet und der Rotor 19 aus der Sicherungsstellung gemäß Fig. 1 in die Scharfstellung gedreht, in welcher die Achse der Zündkapsel 20 mit der Geschoßachse zusammenfällt; dadurch ist der Zündstift in der Lage, die Zündkapsel 20 abzustechen. Ferner wird durch den Drall das Fliehkraftbändchen 26 aus der Stellung gemäß Fig. 1 abgewickelt, bis es an der Innenwand der Führungshülse 15 anliegt, wodurch die Verriegelungskörper 23 aus ihrer Verriegelungsstellung in die Freigabestellung gelangen. Die Hammerhülse 17 ist dann nur noch durch die Fliehkörper 27 gehalten, die unter der Wirkung des Dralles an der kegeligen Fläche 29 der Führungshülse 15 anliegen und dadurch ein Ausstechen der Zündkapsel 20 durch den Zündstift 18 verhindern.

The detonator described works as follows:

• When the projectile, not shown, is fired, the securing spring 31 is pressed flat by the firing acceleration and bears against the guide disk 16. Furthermore, the locking spring 31 is expanded by the swirl and the rotor 19 is rotated from the locking position according to FIG. 1 to the arming position, in which the axis of the primer 20 coincides with the axis of the projectile; this enables the firing pin to pierce the primer 20. Furthermore, the centrifugal band 26 is unwound from the position according to FIG. 1 by the swirl until it rests on the inner wall of the guide sleeve 15, as a result of which the locking bodies 23 move from their locking position into the release position. The hammer sleeve 17 is then held only by the centrifugal bodies 27 which, under the action of the swirl, bear against the conical surface 29 of the guide sleeve 15 and thereby prevent the ignition capsule 20 from being pierced by the ignition pin 18.

When the projectile hits, the inertial body 30 and the hammer sleeve 17 are accelerated forward. The inertial body 30 thus drives the hammer sleeve 17, as a result of which the firing pin 18 fastened to the hammer sleeve 17 strikes the primer capsule 20 at the required speed.

The rotor 19 is secured against inadvertent rotation into its armored position, in particular by the six corners of the annular disk 31, designated by A and B, according to FIG. 3. With the outer corners A, the disk 31 is supported in the groove 42 of the bearing body 12 and with the inner corners B, the disk 31 is supported in the groove 41 of the rotor 19, thereby preventing the rotor 19 from rotating unintentionally.

Claims (4)

1. A safety apparatus for a spinning projectile fuze, comprising:

- a substantially ball-shaped rotor (19) which can rotate out of a safety position into an armed position;

- a bearing body (12) and a disk member (16), said rotor (19) being rotatably mounted between said body (12) and said member (16);

- a first ring-shaped groove (42) provided in said bearing body (12) and being located in a plane which is disposed perpendicular to the lengthwise axis of the projectile;

- a second ring-shaped groove (41) provided in said ball-shaped rotor (19) and being located, in the safety position of the rotor (19), in a plane which is perpendicular with respect to the lengthwise axis of the projectile;

- a safety spring in the form of a ring-shaped disk member (31) which protrudes both into the first ring-shaped groove (42) and into the second ring-shaped groove (41) for securing the rotor (19) in its safety position;

- said safety spring (31) being deformable by the firing acceleration and by the projectile spin for releasing the rotor (19) for movement into its armed position;

characterised in that

- the ring-shaped disk member (31) being subdivided by cut-outs (32, 33) into segments (34-39) located in succession; and

- the successive segments being alternately directed in a wave-shaped configuration upwardly and downwardly.

2. The safety apparatus as defined in claim 1, wherein

- said ring-shaped disk member (31) possesses web members formed by said cut-outs (32, 33);

- said web members allowing deformation of said ring-shaped disk member (31) under the action of the firing acceleration and the projectile spin.

3. The safety apparatus as defined in claim 1, wherein

- said cut-outs (32, 33) form support points at the ring-shaped disk member (31), by means of which the rotor (19) is retained in its safety position.

4. The safety apparatus as defined in claim 2, wherein

- said ring-shaped disk member (31) contains two outer cut-outs (33) and three inner cut-outs (32); and

- said inner cut-outs (32) forming said web members which are deformable by the pro jectile spin.

Images