GB579168A - Improvements in or relating to means for silencing firearms - Google Patents

Abstract

579,168. Gun silencers. LISLE, W. G. DE. May 8, 1943, Nos. 3756 and 7964. [Class 92 (ii)] Relates to gun silencers of the kind in which baffle plates in the form of spiral discs 50 are arranged in a tubular casing 14 spaced eccentrically round the gun barrel 12 to cause the gun gases to swirl about an axis that is offset from the path of the projectile which passes through eccentric perforations in the plates. According to the invention, the baffle plates situated towards the front of the casing have each a radial slit, the portions on adjacent sides of the slit, Fig. 4, being bent to lie at opposite sides of the-general plane of the disc. The casing 14 extends rearwardly around the barrel to form a rearwardly-closed expansion chamber x between the muzzle and the gun receiver. To prevent the formation of a partial vacuum at the gun muzzle, a muzzle attachment comprising a flared nozzle 62 and a rearwardly-extending shield 66 is provided, the shield masking a number of gas escape holes 70 formed in the gun barrel. The discs 50 are supported on rods 40 and the peripheries of the discs are spaced from the interior of the casing, the front flat disc 56 having holes providing front openings at the bottom. In a modification shown in Fig. 7, a front group of spiral plates 50 is combined with a rear group of flat plates 72, 74, 76 and the interior of the rear portion of the casing is provided with a liner in the form of sounddeadening material 82 enclosed in a thin metallic sheath.