| 摘要 |
A bullet trap, for catching a projectile fired from a firearm not more powerful than a .44 Magnum handgun, includes a passageway which has an entrance opening and a shallow exit opening or throat, bounded by upper and lower flat plates inclined to the horizontal at an angle of between 0 DEG and about 15 DEG , and a generally spiral-walled spent projectile energy-dissipating chamber which has a horizontal axis and communicates substantially tangentially with the passageway through the throat. The chamber wall has an initial part which is an upwardly curving extension of the lower plate and a terminal part which is located at the rear end of the upper plate, and the angle of inclination of the plates ensures that the projectile enters the chamber at a relatively low angle to the initial part of the chamber wall and moves along the latter without being shattered or damaging the wall. When the spent projectile ultimately falls off the terminal wall part onto the initial wall part, it moves back through the throat into the passageway and then to a collecting location. The trap may be provided with a liquid lubricant spray system in the chamber to enable spent projectiles, together with any lead dust that may be generated, to be engulfed and flushed along the lower plate to the collecting location.
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