DE1273374B - Bullet trap chamber - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL

Int. α .:

F41j

German class: 72 e -1

Number: 1273 374

File number: P 12 73 374.3-15 (K 56320)

Filing date: June 5, 1965

Opening day: July 18, 1968

The present invention relates to a bullet trap chamber for firing and training ranges consisting of a water tank located below the shooting tunnel sole and one above the The slanted impact ceiling located in the bottom of the firing tunnel to reflect the projectiles into the water tank.

The bullet trap chambers of the aforementioned type have a closed deflecting cover and exist made of a single material. It has been shown that these known blankets do not perform satisfactorily and do not have a sufficient service life. The ceilings have impact energies of 50 up to 800 m / t. This fact leads to the fact that according to one of the invention underlying Recognition that the ceilings have a springy bearing is inevitable. Such a resilient storage However, according to the inventors' experience, this is not possible with a one-piece ceiling. Even in the case of a resilient mounting of the entire ceiling, the inertia of this structure would be too great, in order to ensure an approximately trouble-free ricochet of the projectiles for a larger number of bombardments. It has also been shown that the construction of the ceiling from a single material is not leads to success and damage occurs after a short time with such ceilings.

The invention has the task of enabling an elastic mounting of the ceiling, the Significantly increase the service life of the ceiling and also reduce the signs of wear and tear, as they occur with normal ceilings or normal slabs resulting from the impact of the projectiles or to reduce it considerably.

The invention solves the above-mentioned objects in that the construction of the impact ceiling consists of a plurality of composite cast steel plates, at least one perpendicular to the plane of the plate hard and soft layers follow one another and the lower one serves to reflect the projectiles Side of the composite cast steel plates forms a hard layer.

The construction of the floor slab from composite cast steel plates also has special advantages. It Surprisingly, it has been shown that the composite cast steel plate, in contrast to other composite plates is able to properly deflect high-caliber projectiles. Uniform high carbon steel plates of the same thickness and conventional composition are destroyed after a relatively short time. The structure of the composite cast steel plate from a hardness impact layer and a relatively soft and Bullet trap chamber

Applicant:

Klöckner-Werke A. G.,

4100 Duisburg, Mülheimer Str. 50

Named as inventor:

Friedhelm Hillebrand, 4500 Osnabrück;

Dipl.-Ing. Herbert Pfaff,

Walter Lasseur, 4470 Meppen

tough base layer allows hardness to be set even with heavy panels, which is the case with a single-material system cannot be achieved without the risk of hardening cracks etc. Another requirement is a broad one ao transition zone between hard and soft material, around those that occur with other composite panels To avoid delamination phenomena in the separating layer. To prevent the bullet from penetrating the To avoid plate, hardnesses in the order of magnitude of at least 600 HV are required, which at a single-substance system already lead to a very brittle and highly sensitive material. With lesser ones Hardening, on the other hand, poses a risk of ab-3u as a result of notches through the projectiles impact in undesired directions, so that people endangered and other destruction can be arranged.

According to a preferred embodiment of the invention, the ceiling panels are the bullet trap chamber made of a three-layer composite cast sheet, in which a warping of the plate during hardening is avoided due to the different expansion coefficients.

Composite cast armor plates as such have already been proposed, so that no patent protection is available for them is claimed within the scope of the present invention.

The invention is explained using an exemplary embodiment in the drawing. It shows

Fig. 1 is a plan view of the bullet trap chamber according to the invention in section,

Fig. 2 is a section along the line II-II in Fig.l,

3 shows a section through a two-layer composite cast steel plate,

4 shows a section through a three-layer composite cast steel plate.

809 570/61

The bullet trap chamber 2 adjoins the firing tunnel 1. The bullet trap chamber 2 consists from a water basin, the water level 3 of which is indicated by dashed lines. The ceiling of chamber 2 consists of concrete blocks 4, which are provided with an impact ceiling in the form of a beam made of composite cast steel plates S, which deflect the projectile effect in the water basin. For the sake of clarity are on the bottom of the basin individual floors 15, which were braked in the water basin, drawn. On the bottom of the Basins there is a collecting box 7, in which a container can be used in a known manner can that after pushing in the floors 15 by means of a crane or other hoist can be lifted out.

The reference number 6 denotes a pump room for an automatic water pump. Of the The pump chamber 6 is connected to the water basin of the bullet trap chamber 2 through a drain pipe 8 and has a pump sump 9. An overflow 10 leads from the water basin of the bullet trap chamber 2 to the pump room 6, which has an entrance 11 with crampons 13 for entering the Pump room 6 is equipped. Furthermore, there is a filling opening 12 for the water basin of the bullet trap chamber 2 provided. The water basin of the bullet trap chamber 2, which has been pumped out for evacuation, can be entered through the stairs 14. The bullet trap chamber 2 is separated from the rest of the structure by an expansion joint 16.

F i g. 3 and 4 illustrate sections through the impact ceiling. 3 shows a two-layer composite cast steel plate, the reference letter a representing the layer with the relatively hard composite cast component, while the reference letter b illustrates the relatively soft and tough base layer b. In Fig. 4 shows a composite cast steel plate with the two hard layers α and a relatively soft inner layer b . For the sake of clarity, not the entire extent of the plate is shown, but only a section of it. Likewise, the transition zones between the two layers have not been illustrated. The transition zones are relatively thick in order to ensure a smooth transition from the hard to the soft base material.

Claims (3)

Patent claims: 1. Bullet trap chamber for shooting and practice areas, consisting of one below the The water tank located at the bottom of the shooting tunnel and one located above the bottom of the shooting tunnel Inclined impact ceiling to reflect the floors in the water tank, characterized by the structure of the impact ceiling from a plurality of composite cast steel plates (5), at least perpendicular to the plane of the plate a hard and a soft layer follow one another and the lower one to reflect the projectiles (15) serving side of the composite cast steel plates (5) forms a hard layer. 2. bullet trap chamber according to claim 1, characterized in that in a known manner on the bottom of the water basin to clear the same in a recessed place a collecting box (7) is provided in which the floors (15) can be pushed. 3. bullet trap chamber according to claim 2, characterized in that in the collecting box (7) a container is used, which is lifted out by means of a crane or other hoist can be. Considered publications:
German Patent Nos. 316195, 1120 939; U.S. Patent No. 2812,660. Legacy Patents Considered:
German Patent No. 1211094. 1 sheet of drawings 809 570/61 7.68 © Bundesdruckerei Berlin