JP2014009926A - Inclination type backstop structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inclination type backstop structure with easy maintenance work that can recover a bullet as it is without crush, covers the surface of a rubber chip with a rubber material, prevents scattering of the rubber chip at landing, and reduces a back filling frequency of a part where bullets are intensively landed.SOLUTION: An inclination type backstop structure includes a base 1 having an inclination surface 1a at a proper angle in a backstop, laminates a rubber chip 2 having flame resistance and a proper grain diameter on the base to form a rubber chip layer 2a, and covers the surface of the rubber chip layer with a rubber sheet material 3.

Description

  The present invention relates to an inclined backstop structure, and particularly to stopping and capturing bullets when used for shooting training such as a rifle or a handgun in a shooting range.

  Conventionally, bullets fired from rifles or pistols at shooting ranges have been provided with a backstop behind the target to stop bullets fired by the backstop. Japan has been strictly managed to protect the health of personnel working at the shooting range and to destroy the environment due to lead contamination outside the shooting range. Japan is also trying to improve the recovery rate of lead waste ammunition.

  Therefore, it is desirable to capture the bullets as they are without being crushed, so that instead of a very simple backstop that is directly driven into the inclined ground, sand piles, sandbags, etc. A plurality of rubber sheets are spaced at appropriate intervals, suspended from above, with a hard steel plate inclined at the final position, a hollow rubber block, laminated as it is, or in a rubber casing, Various backstops having a structure in which the hollow rubber blocks are laminated and filled have been developed and used.

  Furthermore, an inclined surface is formed, and a trapping layer is formed on the inclined surface with a viscoelastic material, and the angle of the inclined surface is 15 degrees or less with respect to the direction of bullet movement [Claims: 7], or an invention of a stopping device (back stop) which is set to 15 degrees or more and 30 degrees or less [Claims: Claim 26]. For example, as in Patent Document 1.

JP 2006-343086 A

  With respect to the angle of the inclined surface shown in this technical document, there is no description of the effect of limiting the numerical value in claim 7, and the description of “effect of the invention” with respect to claim 27 includes a bullet. Is landed at an angle of not less than 15 degrees and not more than 30 degrees, it is only described that damage to the steel plate and the reflector can be effectively suppressed.

  However, with the disclosed inclination angle, it is necessary to increase the depth of the backstop, and there are problems in terms of equipment cost, maintenance work, and the like.

  Therefore, the object of the present invention is to eliminate the above-mentioned drawbacks and to recover the bullet without being crushed, to cover the rubber chip with the rubber sheet material on the surface, to prevent the rubber chip from scattering at the time of landing, The purpose is to develop and provide a tilt-type backstop structure that is less likely to be backfilled and easy to perform maintenance work.

  And this invention developed the base which has an inclined surface of the optimal inclination angle which is an inclination type backstop, formed the layer of the rubber chip on the inclined surface, and covered with the rubber sheet material on this Develop and provide a backstop structure.

  According to the present invention, since the surface directly facing the shooter is made of rubber material, it has viscoelasticity, so it does not generate a bullet even when shooting from close range, and can be recovered as it is without pulverizing the bullet, etc. Has an extremely excellent effect.

  Further, by forming a plurality of inclined surface holding structural members in the horizontal direction at predetermined intervals on the inclined surface of the base, there are effects such as making the rubber chips constituting the rubber chip layer more difficult to collapse.

  In addition, since the plurality of slope-holding structural members are formed of deck plates used for flooring in building members, the structure is robust and has excellent effects such as easy construction. .

  And since the angle of the inclined surface of the base is around 35 ° and becomes the angle of repose of the rubber chip, the rubber chip does not slide down from the inclined surface.

  In addition, when the particle size of the rubber chip is large, the resistance when the bullet passes is large, so the effect that the distance that the bullet stops is shortened, and if the distance that the bullet stops is short, the amount of rubber chip that is used It is economical, and when the bullets are separated and collected from the rubber chips, the smaller the amount of the rubber chips, the easier the collecting operation. The bullet stop distance test results are shown in Table 1 below.

  In addition, by using a rubber sheet with a thickness of around 3 mm, the product cost can be reduced compared to using a thick surface material for the same rubber, and the cost of consumables and the amount of waste generated can be reduced. Further, when performing a maintenance work of the rubber chip layer or the like, the rubber sheet is easy to roll, and the work is not complicated, and the effects can be achieved easily and quickly.

  And by making the rubber chip flame retardant, in the case of a bullet that is a fluorescent bullet that flies while burning gunpowder so that you can see the nighttime trajectory with the type of bullet, you can prevent the rubber chip from burning by the combustion Play.

  In the inclined backstop structure, the rubber sheet (10) is provided with a rubber chip holding part (11) configured in a bag shape, so that viscoelasticity is increased and the bullet can be recovered as it is without being crushed, Moreover, the bullet has the effect of not causing a bullet even if it fires from a close range.

  Further, since the rubber block (7) is grounded in the vicinity of the upper end of the inclined surface of the rubber chip stack, there is an effect that the bullets shot upward can be recovered more reliably.

  Further, by providing a rubber bar (5, 5 ') at the lower end of the inclined surface (1a) on which the rubber chip layer (2a) is laminated, the rubber chip (2) is damped.

It is a partial cutaway sectional view showing one example of this invention. FIG. 2 shows an embodiment of the present invention and is an enlarged view of a portion in FIG. 1. FIG. 2 shows an embodiment of the present invention and is an enlarged view of a portion b in FIG. 1.

  Hereinafter, it explains in detail as a suitable embodiment of this invention. The present invention is not limited to the following description, and can be appropriately changed without departing from the gist of the present invention.

  Next, an embodiment of the present invention will be described in detail with reference to the drawings. A base (1) having an appropriate inclined surface (1a) is provided on a solid foundation (A) in an inclined backstop. A rubber chip (2) having a suitable particle size is laminated on the base (1) to form a rubber chip layer (2a), and the surface of the rubber chip layer (2a) And a backstop structure characterized by being covered with a rubber sheet (3).

  In addition, on the back side of the inclined surface (1a) of the base (1), there are a plurality of support columns (X) that support the base (1), a substantially central portion of the inclined surface (1a), and the support column (X). Between the lower end portion, the inclined surface is reinforced by a plurality of streak-shaped reinforcing members (Y).

  Moreover, the back surface protection wall (Z) higher than the upper end of the base is formed on the back surface of the base (1) by using a rubber compression molding material, and moreover than the upper end of the base (1). Similarly, a double rear protective wall (Z ′) made of the rubber compression molding material is provided at the high portion.

  Further, an upper protective wall (Z) directed in the reflection direction is formed on the upper part of the double rear protective wall (Z ′), and a rubber sheet (3) is formed from the front surface of the upper protective wall (Z). The upper end of is fixed and extends downward.

  The rubber sheet (3) extending forward covers the surface of the rubber chip layer (2a), and the lower end of the sheet is pressed by the rubber bar (5) (5 ') and at a constant interval. The metal hit anchor (6) is fixed to the base part.

  Moreover, it is comprised on the inclined surface (1a) of a base (1) so that several slope holding structure members (4) may be formed in a horizontal direction at predetermined intervals.

  The plurality of slope holding structural members (4) may be affixed with a commercially available deck plate in which isosceles trapezoids are continuously arranged at predetermined intervals.

  In addition, the angle of the inclined surface (1a) of the base (1) is formed around 35 °, and this angle constitutes the tip angle of repose so that the rubber chip layer (2a) collapses from the inclined surface. And stably remains on the inclined surface (1a).

  Moreover, the particle size of the rubber chip (2) is 10 to 50 mm. By providing a mixture of rubber chips of different sizes within this range, the viscoelasticity is increased, and the bullet does not shoot even if it fires from a close range. Does not occur. In addition, the particle size of the rubber chip is 10 to 50 mm, the maximum particle size is 50 mm, or the particle size of 10 mm or less is usually 5% or less, and 15 to 25 mm is 65% or more.

  In addition, since the thickness of the rubber sheet (3) is about 3 mm, it can be easily operated even when it is struck by maintenance work, etc. The width of the rubber sheet covers the entire inclined surface of the back stopper. It may be sufficient to cover a plurality of, for example, 3 to 5 lanes.

  Further, near the upper end portion of the inclined surface (1a) of the base (1), a rubber block made of a rubber compression molding material erected from the vicinity of the inclined surface (1a) in the rubber chip layer (2a) ( 7) and a protective frame (9) also made of a rubber compression molding material on the lower surface of the upper inclined member (8) which is located on the upper surface of the rubber chip layer (2a) and is inclined upward in the reflection direction. And the bullets fired upward are stopped.

  A rubber bar (5) for damming the rubber chip (2) is provided at the lower end of the inclined surface (1a) on which the rubber chip layer (2a) is laminated.

  According to the present invention, there is industrial applicability by establishing a technology of an inclined backstop structure and manufacturing and selling a large amount based on the technology.

DESCRIPTION OF SYMBOLS 1 Base 1a Inclined surface 2 Rubber chip 2a Rubber chip layer 3 Rubber sheet 4 Slope holding structure member 5 Rubber bar 6 Metal hit anchor 7 Rubber block 8 Upper inclined member 9 Protective frame
10 Rubber sheet
11 Rubber tip holder A Solid foundation X Post Y Reinforcement member Z Back protection wall Z 'Double back protection wall

Claims (11)

  In the inclined backstop, a base having an inclined surface of an appropriate angle is provided, a rubber chip having an appropriate particle size is laminated on the base, a rubber chip layer having an appropriate thickness is formed, and the rubber chip layer An inclined backstop structure characterized by covering the surface of the rubber sheet with a rubber sheet material.   The inclined backstop structure according to claim 1, wherein a plurality of inclined surface holding structural members are formed in a horizontal direction at predetermined intervals on the inclined surface of the base.   The inclined backstop structure according to claim 1, wherein the plurality of slope holding structure members are formed integrally with the base or are formed as separate members.   The inclined backstop structure according to claim 1, wherein the plurality of slope holding structure members are formed of a deck plate.   2. The inclined backstop structure according to claim 1, wherein an angle of the inclined surface is around 35 [deg.].   The inclined backstop structure according to claim 1, wherein the particle size of the rubber chip is 10 to 50 mm.   The inclined backstop structure according to claim 1, wherein the rubber sheet material has a thickness of about 3 mm.   2. The inclined backstop structure according to claim 1, wherein the rubber chip is made of a flame retardant material.   The inclined backstop structure according to claim 1, further comprising a rubber chip holding portion (11) configured in a bag shape by a rubber sheet (10).   The inclined backstop structure according to claim 1, wherein the rubber block (7) is grounded near the upper end of the inclined surface of the rubber chip stack.   2. The inclined backstop structure according to claim 1, wherein a bar for stopping the rubber chip is provided at a lower end of the inclined surface of the rubber chip.

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