US1333403A - Recoil-absorbing device for firearms - Google Patents

Description

N.IJ. A. GALLIOT AND G. H. L. G. BORAY.

RECOIL ABSORBING DEVICE FOR FIREARMS.

APPLICATION HLED MAR. 22.1919- Patented Mar. 9,1920.

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NORBERT JULES DRE GALLIOT, 0F COURBEVOIE, AND GEORGES HENRI LOUIS GASTON BORY, 0F PARIS, FRANCE.

RECOIL-ABSORBING DEVICE FOR FIREARMS.

Specification of Letters Patent.

Patented Mar. 9%, 1920.

Application filed March 22, 1919. Serial No. 284,454.

To all whom it may concern:

Be it known that we, NORBERT JULEs ANDRE GALLIOT, a citizen of the Republic of France, and a resident of 3 Rue Auguste Bailly, Courbevoie, France, and GEORGES HENRI LOUIS GASTON BORY, a citizen of the Republic of France, and a resident of 17 Rue de la Trmoille, Paris, France, have invented a new and useful Recoil-Absorbing Device for Firearms, of which the following is a specification.

The present invention relates to an improvement in the recoil-absorbing device for fire-arms which consists of a divergent or convergent-divergent expanding nozzle fixed to the end of the barrel of the 'firearm and co-axially thereto so as to increase the kinetic energy of the gases which are then turned aside and directed externally toward the rear by means of a fixed guidevane connected to the'nozzle and generated by the revolution of an are around the'axis of the latter.

A recoil-absorbing device of this kind for fire-arms is described and represented in our United States patent application, filed April 10, 1918, Serial Number 227,7 90.

It has been found that the gases directed back in a direction more or less oblique in relation to the axis of the fire arm have retained a portion of their velocity and constitute an inconvenience or even a danger for the personal serving, or the user of, the fire-arm provided with this device.

The present invention allows the elimination of this inconvenience by transforming the conical stream of gas having a rapid translatory movement directed substantially backward, into a flow of vortices in which the molecules of gas possess a rotary or eddying motion in a zone perpendicular to the axis of the fire-arm, this transformation taking place in the vicinity of the orifices- 0 for the passage of the projectile, this bore 0 having grooves 0 so (as to prevent or re duce considerably the escape of gas during the moment when the projectile is passing through this bore, with suflicient clearance for the projectile not to be influenced during its passage. The obturator comprises on the side facing the fire-arm, a gullet 0 generated by the revolution of a parabolic are around the longitudinal axis w-y of the nozzle and of the barrel; there is obtained in this way an arrangement analogous to a turbine-vane or guide-blade which deflects the streams of gas at their maxi mum speed with the least possible friction. The rear edge of the nozzle a also has an analogous curvature at a starting from the front extremity'or lip of the latter, that is from the point A.

vThe streams of gas escape to the exterior shaped as to present the least p ssible rc-' sistance to the flow of the gases; the reaction upon the guide-vane due to the kinetic energy of the gases operates to reduce the force of recoil of the fire-arm and may even balance it.

Instead of giving to the arc, which generates the guiding surface by revolution around the axis m3 of the barrel and of the nozzle, a parabolic shape according to the single curve B C D, as 1n the earlier specification mentioned above (which causes the gases to be rejected backward in a direction oblique in relation to the axis ww) this are is given a double curvature B C D; the portion B C of the parabolic curve has been retained up to the point C, but this arc is continued by a curve of opposite direction C D; the point C where the inversion of the curve takes lace is determined by the intersection with t e parabolic curve B C D of'a straight line making at A an angle a of to 60 degrees with the internal generatrix of the nozzle. l g

The curve B C D thus obtained instead of continuing around or developing the lip a of the nozzle a, leaves between the nearest points of this lip of and of the ide surface 0, between the planes perpendicular to the axis w-y passing through these points, an

appreciable space for the passage of the gaseous streams;

With a guide-surface presenting this tively localized zone substantially perpendicular to the axis w y of the fire-arm near these orifices a the operation of the device as recoil-absorber is in no way aflected.

It has been found that when the angle a is less than 35 degrees, the operation diminishes as regards thereduction of the recoil; beyond 60 degrees, the result is' better than with an enveloping guide-vaneof the single curvature B C D but the eddying of the gaseous streams is less energetically produced. It is evident that in every particular case there should be considered, according to the type of fire-arm, caliber, etc., the most favorable shape for the doubly-curvedarc of the guide-vane, the dimensions of the nozzle, etc. i

, Having now particularly described and as-- certained the nature of our said invention and in what manner the same is to be performed, we declare that what we claim is 1. A recoil deadener for guns comprising an expansion nozzle secured in extension of and co-axial with the gun muzzle, an end closure for the nozzle having a central opening for the passage of a projectile therethrough, and a reflexed lateral gas escape channel, the discharge mouth of which is flared to direct thereflexed stream of escaping gases into a; zone lying substantially at right angles to the axis of the nozzle.

'2; A recoil deadener for guns comprising an expansion nozzle secured in extension of and co-axial with the gun muzzle, an end closure for the nozzle having a central opening 'for the passage of a projectile therethrough,

and a reflexed lateral gas escape channel, the forward wall of which terminates in a revers'ed curve serving to direct the reflexed stream of escaping gases into a zone lyin substantially at right angles to the axis 0 the nozzle.

3. A recoil deadener forguns comprisin an expansion nozzle secured in extension 0 and co-axial with the gun'muzzle, an end closure for the nozzle having a central opening for the passage of a projectile therethrough,

and a reflexed lateral as escape channel, the

discharge mouth of w ich is flared to direct the reflexed stream of escaping gases into a zone lying substantially at right angles to the axis of the nozzle, the point of inversion of the curve lying at an angle of at least 35 degrees to the wall of the nozzle, and the apex of said angle being situated at the lip" of the'nozzle. a

In testimony whereof we have signed our names to this specification.

NORBERT JULES ANDRE armor. aromas HENRI LOUIS GASTON'BORYJ Witnesses CHAR ES DONY,

A. DEFEVRIMON'L-

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