Frameless bullet trap

Abstract

A slat arrangement for redirecting the trajectory of a bullet has a plurality of elongated steel slats, and each elongated steel slat has a longitudinal front edge and a longitudinal back edge stretching between a first end and a second end. The steel slats are positioned in a louver-like fashion for changing the direction of a bullet following a trajectory along the normal of the slat arrangement. A support structure is connected to each steel slat at the back edge of the steel slat, between the first end and the second end of the steel slat.

Claims

1. A slat arrangement for changing the direction of a bullet, wherein the slat arrangement comprises: a plurality of elongated steel slats, wherein each elongated steel slat has a longitudinal front edge and a longitudinal back edge extending between a first end and a second end; and a support structure supporting the plurality of steel slats; wherein the steel slats are positioned in a louver-like fashion configured so as to be capable of changing the direction of a bullet following a trajectory normal to the slat arrangement; wherein the support structure is connected to each steel slat at the back edge of the steel slat and between the first end and the second end of the steel slat; wherein each steel slat has a first side edge at its first end, the first side edge extending between the front edge and the back edge; wherein each steel slat further has a second side edge at its second end extending between the front edge and the back edge, the second side edge having a configuration conforming to a steel slat side edge having a configuration of the first side edge; and wherein at least a portion of each of the first and second side edges contacts the front edge of the steel slat and is curved, slanted, or non-perpendicular with respect to the front edge.

2. The slat arrangement according to claim 1, wherein the support structure is connected to each steel slat at a point distant from the first end and from the second end of the steel slat.

3. The slat arrangement according to claim 2, wherein one of the first end and the second end of each steel slat is free so as to be permitted to contact an end of a steel slat of a neighboring slat arrangement.

4. The slat arrangement according to claim 3, wherein: the support structure comprises an elongated flat steel bar having an elongated first side surface and an elongated second side surface; and wherein the steel bar has a first front edge and comprises a plurality of cut-outs from the first side surface to the second side surface, each cut-out having an opening at the first front edge and encloses a portion of a steel slat that is located at the back edge of the steel slat.

5. The slat arrangement according to claim 1, wherein each steel slat has a bent, curved, or folded transverse cross-section.

6. The slat arrangement according to claim 5, wherein: each steel slat has an elongated first flat portion located at its front edge and stretching between its first end and its second end; the first flat portion is slanted with respect to the normal of the slat arrangement so as to be capable of changing the direction of a bullet hitting the first flat portion; each steel slat further has an elongated second flat portion located at its back edge and stretching between its first end and its second end; and the second flat portion is slanted with respect to the first flat portion.

7. The slat arrangement according to claim 6, wherein the support structure comprises an elongated flat steel bar having an elongated flat first side surface and an elongated flat second side surface, wherein: the first side surface and the second side surface are parallel, and the flat steel bar is positioned with the first side surface and the second side surface parallel to the normal of the slat arrangement; and the steel bar connects to each steel slat at the back edge of the steel slat and to the second flat portion of each steel slat.

8. The slat arrangement according to claim 6, wherein the first flat portion defines a normal at a first angle relative to the normal of the slat arrangement, and wherein the first angle is in the range of 62° to 68°.

9. The slat arrangement according to claim 8, wherein the second flat portion defines a normal at a second angle relative to the normal of the first flat portion, and wherein the second angle is in the range of 20° to 26°.

10. The slat arrangement according to claim 6, wherein the elongated first flat portions of the steel slats have the same transverse widths.

11. The slat arrangement according to claim 10, wherein all pairs of neighboring steel slats have the same separation between them.

12. The slat arrangement according to claim 6, wherein the elongated first flat portions of the steel slats and the separation between neighboring steel slats is configured to cause a bullet following a trajectory normal to the slat arrangement to hit a first flat portion of one of the steel slats prior to hitting any other portion of the slat arrangement.

13. A bullet trap comprising a slat arrangement oriented for directing a bullet having a horizontal trajectory in a downward direction, wherein the slat arrangement comprises: a plurality of elongated steel slats, wherein each elongated steel slat has a longitudinal front edge and a longitudinal back edge stretching between a first end and a second end; and a support structure supporting the plurality of steel slats; wherein the steel slats are positioned in a louver-like fashion configured so as to be capable of changing the direction of a bullet following a trajectory aligned with a normal of the slat arrangement; wherein each steel slat has a first side edge at its first end extending between the front edge and the back edge; wherein each steel slat further has a second side edge at its second end extending between the front edge and the back edge, the second side edge having a configuration conforming to a steel slat side edge having a configuration of the first side edge; wherein at least a portion of each of the first and second side edges contacts the front edge of the steel slat and is curved, slanted, or non-perpendicular with respect to the front edge of the steel slat; and wherein the support structure is connected to each steel slat at the back edge of the steel slat and between the first end and the second end of the steel slat.

14. The bullet trap according to claim 13, wherein the slat arrangement further comprises: a first steel plate configured so as to be capable of changing the direction of the bullet or bullet fragments subsequent to the bullet hitting a slat, wherein the first steel plate is positioned behind the steel slat, and wherein the first steel plate defines a normal aligned with the normal of the slat arrangement.

15. The bullet trap according to claim 14, further comprising a second steel plate positioned below the slat arrangement so as to be capable of stopping or changing the direction of a bullet or fragments from a bullet subsequent to the bullet passing the slat arrangement, wherein the second steel plate has a first planar portion inclined with respect to the normal of the slat arrangement.

16. The bullet trap according to claim 15, further comprising a third steel plate positioned below the slat arrangement so as to be capable of stopping or changing the direction of a bullet or fragments from a bullet subsequent to the bullet hitting the second steel plate, wherein the third steel plate has a second planar portion inclined with respect to the normal of the slat arrangement.

17. The bullet trap according to claim 16, further comprising a conveyor system located below the slat arrangement and configured for removing bullets or fragments of bullets from the bullet trap subsequent to the bullets or bullet fragments being stopped by the second steel plate or the third steel plate.

18. The bullet trap according to claim 17, wherein the conveyor system comprises a conveyor belt positioned at the second steel plate and the third steel plate, and wherein the second steel plate and the third steel plate are inclined towards the conveyor belt so as to allow bullets or bullet fragments to fall off onto the conveyor belt.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) A more complete understanding of the abovementioned and other features and advantages of the present invention will be apparent from the following detailed description of preferred embodiments in conjunction with the appended drawings, wherein:

(2) FIGS. 1a and 1b are a front view and a side view of a slat arrangement,

(3) FIGS. 2a, 2b, and 2c are a front view, side view, and a top view, respectively, of a steel slat,

(4) FIGS. 3a and 3b are side views of a steel bar and steel slats illustrating the mounting of the steel slats,

(5) FIGS. 4a, 4b, and 4c are a side view, a front view, and a perspective view of a section of a bullet trap,

(6) FIG. 5 is a front view two assembled sections of a bullet trap,

(7) FIG. 6a is a side view of a bullet trap with a conveyor system,

(8) FIG. 6b is a side view of another bullet trap with a conveyor system,

(9) FIG. 6c is a perspective view of the third steel plate described in relation to FIG. 6b, and

(10) FIGS. 7a and 7b are a front view and a side view of an alternative embodiment of a slat arrangement.

DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS OF THE INVENTION

(11) An embodiment of a slat arrangement 10 is illustrated in FIGS. 1a and 1b. The slat arrangement 10 has a number of steel slats 12 manufactured from 8 mm steel plates. This thickness is suitable for rifle ammunition, such as 7.62/10B. In other embodiments, the steel slats 12 are manufactured from 6.5 mm steel plates, which are suitable for pistol ammunition and lighter rifle ammunition, such as 9×19 39B and 5.56 5B. The steel slats 12 are positioned in a louver-like fashion, which means that they are parallel and slanted with respect to the normal 18 of the slat arrangement 10. The normal 18 is indicated by a dashed line in FIG. 1b, i.e. corresponding to a direction from right to left, or vice versa.

(12) The separation between the front edges 14 is equal to the separation between the back edges 16 of neighboring steel slats 10. Also, as is shown in FIG. 1b, all pairs of neighboring steel slats have the same separations between them.

(13) The front edges 14 of the steel slats 12 are parallel and define a common plane, i.e. they are coplanar, as is evident from in FIG. 1b. The normal 18 of the slat arrangement corresponds to the normal 18 of the common plane. A bullet fired straight at front of the slat arrangement has a direction or trajectory that is parallel to the normal 18.

(14) The louver-like position of the steel slats 12 causes a bullet that follows a trajectory parallel to the normal 18 to change direction. In the orientation of the steels slats in FIGS. 1a and 1b, the new direction of the bullet will have a downward component subsequent to hitting a steel slat 12, as is illustrated by the dotted line 20.

(15) The slat arrangement 10 also has a support structure in the form of a left, or first, flat steel bar 22 and a right, or second, flat steel bar 24. The steel bars are identical in shape. Each steel bar has a left, or first, side surface 26 and a right, or second, side surface 28 that are parallel to the normal 18 of the slat arrangement 10. This means that the profile of the steel bars 22 and 24 is minimized with respect to a shooter firing along the normal 18, and the risk of ricochets is reduced.

(16) Each steel bar 22 and 24 connect to each steel slat 12 at the back edge 16 of the steel slat 12 and between the left end 30 and the right end 32 of the steel slat 12, thus supporting the steel slat 12. This construction has the effect that the risk of hitting the steel bars 22 and 24, i.e. the support structure, is reduced. Further, the left end 30 of a steel slat 12 is free to contact the right end of a steel slat of a neighboring slat arrangement without any frame between them. The right end 32 of a steel slat 12 is similarly able to contact the left end of a steel slat of another neighboring slat arrangement.

(17) The steel slats 12 extend from the steel bars 22 and 24 in the general direction from which bullets will come. Thus, a bullet having a trajectory along the normal 18 of the slat arrangement 10 passes between the front edges 14 of a pair of neighboring steel slats 12 before it can reach the steel bars 22 and 24, i.e. the support structure.

(18) A portion of the right steel bar 24 is illustrated in FIGS. 3a and 3b and indicated by the dashed lines. The right steel bar has a first front edge 34 with a number of cut-outs 36 from the left side surface 22 to the right side surface 24, as is illustrated in FIG. 3a. Each cut-out 36 has an opening 38 in the first front edge 34.

(19) FIGS. 2a, 2b, and 2c are a front view, side view, and a top view, respectively, of a steel slat 12 as described in relation to FIGS. 1a, 1b, 3a, and 3b. The steel slat 12 is folded lengthwise and the fold 40 goes from the left end 30 to the right end 32 of the steel slat 12.

(20) The steel slat 12 has a first side edge 31 at its first end 30 with a portion that is slanted, i.e. at a non-perpendicular angle, with respect to the front edge 14. The steel slat 12 further has a second side edge 33 at its second end 32 that is also slanted with respect to the front edge 14. The second side edge 33 is formed so that it would conform to the first side edge 31, should these two edges meet.

(21) The steel slat 12 has an elongated first flat portion 42 located at its front edge 14 and stretching between its left end 30 and its right end 32. The first flat portion 42 is slanted with respect to the normal 18 of the slat arrangement 10, as is shown in FIG. 1b. The first flat portion 42 defines a normal 46 at a first angle relative to the normal 18 of the slat arrangement. The first angle is about 65°.

(22) The steel slat 12 further has an elongated second flat portion 44 located at its back edge 16 and stretching between its left end 30 and its right end 32. The second flat portion 44 is slanted with respect to the first flat portion 42 and defines a normal 48 at a second angle relative to the normal 46 of the first flat portion 42. The second angle is about 23°. The first flat portion 42 and the second flat portion 44 are connected along the fold 40 of the steel slat 12.

(23) The second flat portion 44 of each steel slat 12 is inserted in a cut-out 36 of the steel bar 24, as is illustrated in FIGS. 3a and 3b by inserting the second flat portion 44 through the opening 38 of the cut-out 36. This way, the cut-out 36 encloses a portion of a steel slat 12 located at its back edge 16 and the steel slat is connected to the steel bar 24.

(24) Each cut-out 36 is be formed with a leaf-spring 50 that biases a portion of the steel slat 12 and maintains the position of the steel slat 12 with respect to the steel bar 24.

(25) The separation between neighboring steel slats 12 is 40 mm. This is suitable for rifle ammunition, such as 7.62/10B. In other embodiments the separation is 50 mm, which is suitable for lighter rifle ammunition, such as 5.56 5B, or 40 mm, which is suitable for pistol ammunition, such as 9×19 39B.

(26) The transverse width of the first flat portion 42 of each steel slat 12 is 102 mm. In FIG. 2c, the transverse width is at a right angle to the fold 40. The transverse widths and the separations between the steel slats are such that that a bullet following a trajectory along the normal 18 of the slat arrangement 12 first hits a first flat portion 46 of a steel slat prior to hitting any other part or portion of the slat arrangement 10.

(27) The slat arrangement 10 also has a first or back steel plate 52, as shown in FIGS. 1a and 1b. The back steel plate 52 is transverse to the normal 18 of the slat arrangement 10. The back steel plate 52 is planar, which means that it defines a normal 54 parallel or aligned with the normal 18 of the slat arrangement 10. As is indicated by the trajectory 20 in FIG. 1b, bullet or bullet fragments will hit the back steel plate 52 after the bullet has hit a steel slat 12, which means that the back steel plate is configured for changing the direction of the bullet or bullet fragments.

(28) FIGS. 1a, 4b, and 4c are a side view, a front view, and a perspective view of a section of a bullet trap 8. The bullet trap 8 has a slat arrangement 10 similar to the one described in relation to FIGS. 1 to 3. However, the steel slats are not shown for the sake of clarity. Features having the same or similar functions as in FIGS. 1 to 3 have been given the same number indexing, but with a prime.

(29) Each section 58 of the bullet trap 8 is composed of a housing 60 having a top portion 62, bottom portion 64, and a back portion 66. The back portion 66 also has the function of a back steel plate 52′, as described in relation to FIGS. 1a to 1c.

(30) FIG. 5 illustrates two sections 58 positioned side by side and joined by a steel strip 68 connecting the back steel plates 52′ of respective section 58. The left steel bar 22′ and the right steel bar 24′ of the slat arrangement are indicated in in FIG. 5. This means that the steel strip 68 is positioned at the middle of a steel slat supported by the left steel bar 22′ and the right steel bar 24′. The steel slats of the bullet trap 8 are the same as those described in relation to FIGS. 1 to 3.

(31) The bullet trap 8 also has a second steel plate 70 positioned behind and below the steel bars 22′ and 24′, i.e. below the slat arrangement, and forms part the bottom portion 64. The second steel plate 70 stops or redirects a bullet or fragments from a bullet after to the bullet has passed the slat arrangement.

(32) The bullet trap 8 has a wall connector 96 that connects to a wall behind bullet trap 8. The wall connector 96 has a portion 98 of a vibration absorbing material that prevents vibrations caused by bullets hitting the slat arrangement from being conveyed to the wall via the wall connector 96. The bullet trap also has a floor connector 100 that connects the bullet trap 8 to a floor below the bullet trap 8. The floor connector 100 also has a portion 102 of the vibration absorbing material for preventing vibrations caused by bullets hitting the slat arrangement from being conveyed to the floor via the floor connector. The abovementioned vibration absorbing material is a cellular polyurethane.

(33) A side view of the lower parts of an alternative embodiment of a bullet trap 8′ is shown in FIG. 6a. Features having similar or identical functions as those of the bullet trap described in relation to FIGS. 1 to 4 have been given the same number indexing, but with an additional prime. The second steel plate 70′ has a first planar portion 72. The first planar portion 72 is aligned with the normal 18′ of the slat arrangement 10′, as is shown in FIG. 7. This means that the first planar portion 72 defines a normal 74 transverse to, or perpendicular to the normal 18′ of the slat arrangement 10′. The second steel plate 70′ also has an additional first planar portion 76. The additional first planar portion 76 is inclined with respect to the normal 18′ of the slat arrangement 10′ and defines a normal 78 at a third angle of relative to the normal 18′ of the slat arrangement 10′. The third angle is about 60°.

(34) The bullet trap also has third steel plate 80′ positioned below the slat arrangement 10 and in front of the second steel plate 70′. The third steel plate 80′ stops or changes the direction of a bullet or fragments from a bullet subsequent to hitting the second steel plate 70′. The third steel plate 80′ has a second planar portion 82 that is transverse to the normal 18′ of the slat arrangement 10′. This portion effectively stops all bullets or bullet fragments coming from the second steel plate 70′. This means that the second planar portion 82 defines a normal 84 aligned with, or parallel with, the normal 18′ of the slat arrangement 10′. The third steel plate 80′ also has an additional second planar portion 86. The additional second planar portion 86 is inclined with respect to the normal 18′ of the slat arrangement 10′ and defines a normal 88 at a fourth angle of relative to the normal 18′ of the slat arrangement 10′. The fourth angle is about 45°.

(35) The bullet trap 8′ has a conveyor system 90 located below the slat arrangement 10′. The conveyor system 90 has a conveyor belt 92 supported by a frame 94 and is oriented to run in a direction parallel to the steel slats 12′. The conveyor belt 92 is composed of metal links, thus having a metal surface that can carry bullets or bullet fragments. The second steel plate 70′ and the third steel plate 80′ shield the frame 94 from bullets and bullet after they have passed the slat arrangement 10′.

(36) A side view of the lower parts of another embodiment of a bullet trap 8′ is shown in FIG. 6b. Features having identical functions as those of the bullet trap described in relation to FIG. 6a have been given the same number indexing, and features having a related function have been given the same number indexing, but with an added prime.

(37) The bullet trap has a planar third steel plate 80′″ positioned below the slat arrangement 10′ and in front of the second steel plate 70′. The third steel plate 80″ stops a bullet or fragments from a bullet subsequent to hitting the second steel plate 70′.

(38) The third steel plate 80″, which is further shown in FIG. 6c, is rectangular and defines a second planar portion 82′. A rectangular through-going hole 83 is located at each of the ends and on the upper side of the third steel plate 80″.

(39) The bullet trap 8′ has a plate support 85 in the form of an elongated steel plate. The plate support 85 is coplanar with the right flat steel bar 24′ and has a proximal portion 87 that is welded to the bottom edge of the right flat steel bar 24′. The plate support 85 also has a distal portion 89 that is connected to the proximal portion 87 and that is inserted in one of the through-going holes 83. This way, the plate support 85 supports one end of the third steel plate 80″.

(40) The height of the proximal portion 87 is greater than the height of the through-going hole 83, thus preventing the third steel plate 80″ from moving towards the slat arrangement 10′. The distal portion 89 has an upward extending protrusion that prevents the third steel plate 80″ from falling off the plate support 85. The distal portion 89 is of sufficient length for two similar steel plates to be placed thereon. The distal portion 89, and thus also the third steel plate 80″, are positioned above the conveyor belt 92 of the conveyor system 90.

(41) Another plate support (not shown), similar to the one shown in FIG. 6b, is attached to a left flat steel bar (not shown) and engages the other through-going hole 83, thus supporting the other end of the third steel plate 80″ in a corresponding manner as described above.

(42) The height of the through-going hole 83 is greater than the height of the distal portion 89, thus allowing the third steel plate 80″ to hang freely on the plate support 85 and swing back and forth when hit by a bullet or bullet fragments coming from the second steel plate 70′. When at rest, the third steel plate 80″, or the second planar portion 82′, are transverse to the normal 18′ of the slat arrangement 10′. This means that the second planar portion 82′ defines a normal 84′ aligned with, or parallel with, the normal 18′ of the slat arrangement 10′.

(43) The third steel plate 80″ can be lifted off the plate support 85, thus allowing for an easy maintenance of the conveyor system 90 and the part of the bullet trap 8′ located behind the third steel plate 80″.

(44) FIGS. 7a and 7b illustrate a front view and a side view of an alternative embodiment of a slat arrangement 10′. Features in common with the embodiment described in relation to FIGS. 1a and 1b have the same number index, but with a prime. The embodiment of FIGS. 1a and 7b differs in that the spacing between the slats 12′ is greater so that a bullet with a trajectory along the normal 18′ also can hit the second flat portion 44′ directly.

ITEM LIST

(45) 8 bullet trap 10 slat arrangement 12 steel slats 14 front edge 16 back edge 18 normal of slat arrangement 20 bullet trajectory 22 left flat steel bar 24 right flat steel bar 26 left side surface 28 right side surface 30 left end of steel slat 32 right end of steel slat 34 front edge of steel bar 36 cut-out 38 opening 40 fold 42 first flat portion 44 second flat portion 46 normal of first flat portion 48 normal of second flat portion 50 leaf-spring 52 back steel plate 54 normal of back steel plate 58 section of bullet trap 60 housing 62 top portion 64 bottom portion 66 back portion 68 steel strip 70 second steel plate 72 first planar portion 74 normal of first planar portion 76 additional first planar portion 78 normal of additional first planar portion 80 third steel plate 82 second planar portion 83 through-going hole 84 normal of second planar portion 85 plate support 86 additional second planar portion 87 proximal portion 88 normal of additional second planar portion 89 distal portion 90 conveyor system 92 conveyor belt 94 frame 96 wall connector 98 portion of a vibration absorbing material 100 floor connector 102 portion of a vibration absorbing material