DE2644154A1 - FOAM ELEMENTS IN THE STOREY CONSTRUCTION - Google Patents

Description

PATEKTANWRLTE GERMAN-FRENCH RESEARCH INSTITUTE ^ t- *,

, MONCHEUaO ^ EfiKl ^ STR. «^ ^ ^ ■ - ■ ^^^: ^^ _{uis / Frankre} i

H.-J. ERNST ■. '·· .. " ¹ SaInt-touts,' August 24, 1976 / MLS

ISL / BAP _#

FOAM ELEMENTS IN THE FLOOR CONSTRUCTION

The problem of minimizing weight is in the projectile construction in general and to a greater extent in the design of sub-caliber Bullets of great importance. These include also about the weight of all structural elements of a storey, the do not contribute directly to the effect in the goal, as much as possible to decrease. Added to this is the case of subordinate work Shot that after leaving the muzzle, guide parts or similar elements fly apart laterally and so in an undesirable way reduce the safety in front of the weapon.

The present invention relates to both methods for reducing the Bullet or shot weight as well as to increase the safety in front of the weapon of sub-caliber bullets by using extreme lighter elements made of foam for projects of all calibers with and without twist.

FIG. 1 shows the principle drawing of a completely square projectile, in which elements made of foam fill cavities and, within certain limits and in connection with supporting structures, take over functions of fixing and / or centering.

In Figure 2 , the principle drawing of a sub-caliber projectile is shown, which is centered, radially supported and guided by elements made of foam during the acceleration phase in the tube.

As an example for the use of structural elements made of foam are guide parts for sub-caliber projectiles in fire tests been tried. FIG. 3 shows the rod bullet made of hardened steel (a) of dimensions 8 × 100 mm on which the tests are based

ORIGINAL INSPECTED

Resistance stabilization with a glass fiber reinforced propulsion piston Plastic with an acceleration plate made of steel (c) is shot from a smooth 30 mm tube. A cylindrical hollow

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body made of foam-trimmed polystyrene (b) with a weight of almost 4 g guides and centers the bullet in the barrel.

FIG. 4 shows a projectile fired with this arrangement, which flies stably at a speed of 1,443 m / s. The propulsion piston and the guide part, which is completely dismantled into fragments of different sizes, follow the projectile in a widely spread VJoIke. Blurred contours of even larger fragments and a considerable distance to the rear of the projectile - the picture was taken 3.50 m in front of the muzzle - prove the rapid decrease in their speed.

A weight comparison is shown in FIG. 5 , the shot weight of the test bullet shown in FIG. 3 with guide part aiis'jschäumka.rem polystyrene being compared to the shot weight of the same bullet with guide parts made of glass fiber reinforced plastic. With a relative decrease in the weight of the guide part of 85 % , a relative reduction in the shot weight of 22% is achieved.

vev- _ £ The tests have shown that structural elements are made of foam core Polystyrene are able to take over radial support and guidance functions at high accelerations. After leaving the mouth They dismantle by themselves. Due to their low weight the fragments are braked so quickly by air resistance - that they cannot cause any significant damage in front of the muzzle. This is a significant increase in safety in front of the weapon. enables.

The technical advance in the use of the invention lies in following points :

1.) There will be a significant reduction in the weight of the bullet or shot made possible with unchanged active part.

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2.) A lower shot weight leads to a saving in the Propellant charge and thus also reduces the powder mass to be accelerated.

3.) Lower shot weights and smaller propellant charge weights reduce the wear and tear of the weapon system.

4.) The reduction of the shot weight allows either one Increasing the mass of the active part or increasing the speed of the bullet. Both possibilities lead to one Increase in the effect of the projectile in the target.

5.) The invention can be used in bullets of all calibers. Their applicability is independent of the storey structure.

6.) The manufacturing process is simple and cheap. The Elements are moderate, age-resistant and do not require any post-treatment. -. .

Additional points when using the invention in sub-caliber Shot .:

7.) The flight behavior of the projectile is when the elements are detached hardly affected.

8.) The safety in front of the weapon is increased significantly.

Claims (13)

?: 76 PATENT CLAIMS Method for reducing the bullet weight of full-caliber Shot, characterized in that extremely light structural elements made of foam with a density of about 3
0.05 g / cm fill voids and, within certain limits and in connection with supporting structures, take on the functions of fixation and / or centering. 2.) Procedure for reducing the shot weight of under-caliber Shot, characterized in that extremely light structural elements made of foam with a density of about 0.05 g / cm take on radial support, centering and guiding functions. 3.) Procedure to increase safety in front of the weapon for under-caliber Bullets, characterized in that extremely light elements made of foam with radial support, centering and Guiding function when shooting immediately after leaving the muzzle, disintegrate automatically and very quickly from air resistance be braked. 4.) Device for performing the method according to claim 2 and 3, characterized by guide parts for sub-caliber projectiles made of foamable polystyrene. 5.) Sub-caliber projectile, especially after one of the
Claims 1 to 5, with at least one radial guide element made of plastic, characterized in that this element or these elements consists at least in part of lightweight foam plastic, such as foamed polystyrene. 6.) Projectile according to claim 5 _3, characterized in that the foam plastic is a foamed thermoset. 7.) Projectile according to claim 5 or 6, characterized in that the foam plastic has a density of about 0.05g / cm ^ owns. 8.) Projectile according to one of claims 5 to 7, characterized in that that the foam plastic is a rigid foam. 9.) Projectile according to one of claims 5 to 7, characterized in that the projectile has a propulsion piston
fiber-reinforced thermoset plastic. 10.) Projectile according to claim 9, characterized in that the reinforcing fibers are glass or carbon fibers. Ii.) Projectile according to one of Claims 5 to 10, characterized in that that the guide element is a jacket. 12.) Projectile according to claim 11, characterized in that the jacket has at least two predetermined tear joints evenly distributed over the circumference and running in the axial direction
possesses, for example in the form of joint surfaces glued together between two identical shell parts. 13.) Projectile according to one of claims 5 to 12, characterized in that that it is arrow stabilized ..