Ordnance – Shields – Shape or composition
Patent
1990-12-14
1991-12-10
Brown, David H.
Ordnance
Shields
Shape or composition
273410, F41J 114
Patent
active
050707639
ABSTRACT:
A bullet trap for a horizontally fired bullet includes a passageway bounded by upper and lower flat metal plates which may be inclined to the horizontal at an angle of between 0.degree. and 7.degree.. The passageway has an entrance opening and a shallow exit opening or throat, and a generally spiral-walled spent bullet energy-dissipating chamber having a horizontal axis communicates substantially tangentially with the passageway through the throat. The chamber wall, no part of which has a radius or curvature smaller than 28 inches, 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. A white water lubricant may be sprayed against the initial part of the chamber wall and, upon flowing down the same into the passageway and along the lower plate into a collecting vessel, may be recirculated to the spray head in the chamber. The low angle passageway boundary plates ensure that the bullet 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 bullet ultimately falls off the terminal wall part onto the initial wall part, it is flushed by the liquid lubricant back through the throat into the passageway and then into the collecting vessel.
REFERENCES:
patent: 385546 (1888-07-01), Decumbus
patent: 398186 (1889-02-01), Rehfuss
patent: 694581 (1902-03-01), Reichlin
patent: 840610 (1907-01-01), Easdale
patent: 2013133 (1935-09-01), Caswell
patent: 2772092 (1956-11-01), Nikoden
patent: 3737165 (1973-06-01), Pencyla
patent: 4126311 (1978-11-01), Wagoner
patent: 4512585 (1985-04-01), Baravaglio
patent: 4728109 (1988-03-01), Simonetti
patent: 4821620 (1989-04-01), Cartee et al.
"Range Design Considerations" by Detroit Armor Corporation, 1986, pp. 1-38.
Miscellaneous Bullet Trap Product Information Sheets by Caswell International Corp.
Brown David H.
Holler Norbert P.
Passive Bullet Traps Limited
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