Amusement devices: games – Aerial projectile game; game element or accessory therefor... – Projectile backstop
Patent
1986-01-29
1988-03-01
Shapiro, Paul E.
Amusement devices: games
Aerial projectile game; game element or accessory therefor...
Projectile backstop
2091391, 209147, 209906, 209925, F41J 112
Patent
active
047281090
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a ballistic projectile-arrester having a regeneration and/or recovery system for the impact material, said projectile-arrester being suitable for firing with small arms or with arms of other kinds, in particular in indoors firing grounds or shooting-galleries. More particularly, the present invention relates to a ballistic projectile-arrester for small arms that are capable of shooting high kinetic energy projectiles, said projectile-arrester comprising, as a slowing down structure, a granular material system whch is preferably fireproof and allows a soft impact with the projectile and the dissipation of said kinetic energy in a fully safe way, as well as a system that allows the granular material to be recovered and the fired projectiles to be eliminated.
As it is well known, a large number of the most various structures have been adopted up to the present time as ballistic projectile-arresters, which structures are effected by serious practical drawbacks and pollution problems.
For instance, the less sophisticated structures realized up to now, consisting in projectile-arresters made up of walls or stacks of wood, or of piles of pneumatic tires, heaps of sand, embankments, and so on, show the drawbacks of the requirements of a costly and careful maintenance, and of a poor reliability from the safety viewpoint.
Some types of projectile-arresters already known at the present time, consist essentially of a metal impact surfaces which convey, with no possibility of return of the projectiles thanks to their suitable geometric shapes, the projectiles and the respective fragments towards a deceleration or kinetic energy dissipation chamber, where they are finally collected. With such a kind of arrangement, the projectile impact onto the metal causes a large production of fragments, dusts and lead vapors.
It is well evident that the most serious or dangerous drawback of the projectile-arresters of the metal type that remains unsolved is the drawback of the formation of dusts and of lead vapors generated during the strong impact, which is partially inelastic, between the high kinetic energy projectile and the sloping metallic plate onto which the projectile shatters.
Moreover, though the projectile-arresters of the metallic type do not present the unsolvable problem of the rebound, they present, at least at a certain distance, some features of lack of safety for the personnel.
A further serious drawback is the problem of disposal of said lead vapors, as their direct dispersal into the environments would surely give incalculable damages. On the other hand, the disposal of said noxious vapors through a filtering or an analogous system cannot be proposed because of the very high investment and plant costs, as for instance the need for skilled personnel in the use of the necessary specialized equipment.
A further type of projectile-arrester employed at the present time is that of the non metallic type (i.e., that employing wooden crosspieces, pneumatic tires, sand, etc.), which types present a series of drawbacks that caused the same to be abandoned. Indeed, such projectile-arresters are poorly reliable for the personnel and in addition they become easily saturated with lead and fragments or debris; moreover, they are inconvenient in their maintenance because of the frequent and costly interventions as well as of the periodic substitution of the whole impact structure, be such structure made up of crosspieces, pneumatic tires, rubber slabs etc., or of any other material in traditional use.
More particularly, sand embankments give rise, in addition to lead saturation, also to a persisting dust cloud consisting of siliceous dusts that obscure the end part of the shooting-gallery.
Earth banks are suitable for outdoor firing grounds only, which because of various reasons, are progressively giving way to the indoor grounds.
It is therefore well evident that there is a need for a ballistic projectile-arrester according to the present invention which can obviate, as a result of its structura
REFERENCES:
patent: 1728046 (1929-09-01), Duerr
patent: 2411026 (1946-11-01), Conner et al.
patent: 2850162 (1958-09-01), Widmer
patent: 3572503 (1971-03-01), Hezel
patent: 3920542 (1975-11-01), Laird et al.
patent: 4431530 (1984-02-01), Syben
Impresa Costruzioni Soc. FRA. SA. S.r.l.
Shapiro Paul E.
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