Laser beam projector and mounting means therefor

Education and demonstration – Organized armed or unarmed conflict or shooting – Gunnery

Patent

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Details

89 1405, 89 4106, 89 4101, F41G 326

Patent

active

047689587

DESCRIPTION:

BRIEF SUMMARY
This invention relates to a laser beam projector for simulating the firing of a projectile such as a bullet and more particularly to means for mounting the projector on a weapon barrel. The means for mounting is primarily intended for small arms infantry weapons such as rifles, automatic rifles and machine guns, though the invention can be equally applied to larger calibre weapons and also to vehicle mounted weapons.
Existing equipment known as weapons effect simulators generally employ a pulsed laser beam to give a harmless representation of a bullet for use in weapons training situations. The potential target is equipped with detectors sensitive to the laser pulse, which indicate a "kill" or "near miss" when the pulse is detected. In order to achieve realistic training, two parameters are important in the design of the laser projector, these are: weapon. a blank round.
Existing equipment achieves item (1) for small arms weapons by either incorporating a sight into the laser projector, or by a fitting procedure which involves adjustment of either the weapons sights or the projector. Item (2) is generally achieved by analysis of the weapon vibration, noise or muzzle flash.
An object of the invention is to provide a method for achieving immediate self-aligment of the laser beam of the projector while retaining undisturbed use of the weapon sights. A further object is to provide a simple method for detecting the detonation of a blank round for the purpose of initiating the laser beam.
A further object is to provide an alignment plug so designed for use with blank ammunition that automatic and semi-automatic weapons function normally.
According to the invention there is provided an alignment plug for mounting a light beam projector assembly on the barrel of a weapon, comprising an elongate body of substantially cylindrical cross-section of which a first body portion serves for location within the muzzle end of the barrel and a second body portion serves for attachment of the projector assembly, a window in said plug for entry of light emitted on detonation of a blank round, a light detector, means for transmitting light entering said window, and aperture means extending axially of said plug and serving to relieve the pressure of the detonation to the exterior of the barrel.
The gas pressure relief passage may take the form of slots or holes running axially along the alignment plug, to allow pressure relief from the barrel to the atmosphere. the relief passage has an effective cross section sufficient to allow pressure to remain in the barrel, after each blank round is fired, so that the weapon recocks normally. The alignment plug is therefore suitable for automatic and semi-automatic weapons.
Where the relief passage is chosen in the form of slots, there may be of such a number that do not interfere with the weapon rifling grooves, and may be of helical form (of opposite hand to the weapon rifling grooves).
The projector may be permanently attached to the plug and aligned at the time of manufacture, permitting automatic self-alignment with the weapon barrel and hence the exit trajectory of a real bullet, when mounted on the barrel by the user. In this way the projector does not have to be aligned on the weapon in the workshop or in the field.
The alignment plug replaces the conventional blank fire adaptor, normally employed on automatic and semi-automatic weapons, and must enable the normal recocking to occur after each round. The plug may be secured to the weapon by similar means to that employed by the blank fire adaptor.
The invention will now be described by way of example with reference to the accompanying drawings in which:
FIG. 1 is a longitudinal section of an alignment plug of a projector assembly,
FIG. 2 is a section of an alignment plug similar to that of FIG. 1 shown in position within a rifle barrel and its flash eliminator,
FIG. 3 shows a mounting assembly for the alignment plug and a portion of the latter,
FIGS. 4 and 5 show longitudinal sections of two further embodiments of alignment plugs,
F

REFERENCES:
patent: 3510965 (1970-05-01), Rhea
patent: 3938262 (1976-02-01), Dye et al.
patent: 4048489 (1977-09-01), Giannetti
patent: 4367516 (1983-01-01), Jacob

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