Gun sound moderator

Abstract

A gun sound moderator 30 has an external moderator cylinder wall 50 inside which is a series of stages 54 each having a baffle 32 formed with a concentric hole 46 which is concentric with the cylinder wall 50 and a deflector 38 , gas passing through the concentric hole being deflected by the deflector 38 so as to move with a radial component towards an end to move with a circulatory motion along/around inside the moderator cylinder wall 30 so as to achieve improved heat transfer from the gas through the moderator cylinder wall and into the ambient atmosphere outside the gun sound moderator so as to achieve cooling of the gas so as to reduce its volume and controlled gas release to atmosphere, so as to achieve a relatively quiet report/noise when a projectile 20 is fired through the gun sound moderator.

1 . A gun sound moderator which is adapted to mount at a gun barrel muzzle, the moderator having a body, the body having a longitudinal axis and having a moderator cylinder wall having an internal surface within which are a plurality of moderating stages, each stage having (A) a baffle formed across and inside the cylinder wall and having a concentric hole which is concentric with the moderator cylinder wall; and (B) a deflector adapted to deflect gas flow from the concentric hole to move with a radial component so as to impact the internal surface of the moderator cylinder wall and be guided for circulation around the same. 
     
     
         2 . A gun sound moderator as claimed in  claim 1  in which the deflectors in different stages are positioned rotated apart relative to one another at each stage. 
     
     
         3 . A gun sound moderator as claimed in  claim 1  in which each stage has more than one said deflector. 
     
     
         4 . A gun sound moderator as claimed in  claim 2  in which each stage has more than one said deflector. 
     
     
         5 . A gun sound moderator as claimed in  claim 3  in which two said deflectors at each stage are positioned angularly rotated 180° relative to one another about the longitudinal axis of the body. 
     
     
         6 . A gun sound moderator as claimed in  claim 4  in which two said deflectors at each stage are positioned angularly rotated 180° relative to one another about the longitudinal axis of the body. 
     
     
         7 . A gun sound moderator as claimed in  claim 3  in which each deflector, when viewed cutaway in a direction from a side of the body, looks straight and angled at approximately 45° to the longitudinal axis of the body. 
     
     
         8 . A gun sound moderator as claimed in  claim 2  in which each deflector is curved with a radius in a section viewed across the longitudinal axis of the body. 
     
     
         9 . A gun sound moderator as claimed in  claim 5  in which each deflector is curved with a radius in a section viewed across the longitudinal axis of the body. 
     
     
         10 . A gun sound moderator which is adapted to mount at a gun barrel muzzle, the moderator having a body, the body having a longitudinal axis and having a moderator external wall having an internal surface within which is at least one moderating stage, each stage having (A) a baffle formed across and inside the external wall and having a gas passage formed for the flow of gas therepast; and (B) a deflector adapted to deflect gas flow from the gas passage to move so as to flow towards the inside of the moderator external wall and be guided for circulation around the same. 
     
     
         11 . A gun sound moderator as claimed in  claim 10  in which the moderator external wall is circularly cylindrical. 
     
     
         12 . A gun sound moderator as claimed in  claim 10  which includes a plurality of said stages. 
     
     
         13 . A gun sound moderator as claimed in  claim 10  in which the gas passage comprises a hole formed through the baffle and concentric with a centre longitudinal axis of the body of the gun sound moderator. 
     
     
         14 . A gun sound moderator as claimed in  claim 13  in which each deflector includes a first wall surface which is curved so as to deflect gas travelling from the hole towards the external wall, the first wall surface preferably being an at least part circularly cylindrical first wall surface and oriented with a longitudinal direction thereof substantially perpendicular to the central longitudinal axis of the body. 
     
     
         15 . A gun sound moderator as claimed in  claim 13  in which each deflector includes a second wall surface which is planar or substantially planar and which is oriented substantially parallel to the longitudinal direction of the at least part circularly cylindrical first wall surface. 
     
     
         16 . A gun sound moderator as claimed in  claim 13  in which each deflector includes a second wall surface which is planar or substantially planar and which is oriented substantially parallel to the longitudinal axis of the body. 
     
     
         17 . A gun sound moderator as claimed in  claim 14  in which each deflector includes a third wall surface, the third wall surface together with the external wall forming a passage therebetween for the flow of gas therethrough with a circulatory or rotational motion around inside and guided by the external wall. 
     
     
         18 . A gun sound moderator as claimed in  claim 17  in which the third wall surface has a curved profile and substantially comprises part of a surface of revolution whose imaginary axis of rotation is on a convex side of the curved profile. 
     
     
         19 . A gun sound moderator as claimed in  claim 18  in which the curved profile is substantially semi-circular. 
     
     
         20 . A gun sound moderator as claimed in  claim 15  in which each deflector includes a third wall surface, the third wall together with the external wall forming a passage therebetween for the flow of gas therethrough with a circulatory or rotational motion around inside and guided by the external wall. 
     
     
         21 . A gun sound moderator as claimed in  claim 20  in which the third wall has a curved profile and substantially comprises part of a surface of revolution whose imaginary axis of rotation is on a convex side of the curved profile. 
     
     
         22 . A gun sound moderator as claimed in  claim 21  in which the curved profile is substantially semi-circular. 
     
     
         23 . A gun sound moderator as claimed in  claim 10  in which each deflector is configured to deflect gas to adopt an at least partly toroidal motion within the body of the moderator. 
     
     
         24 . A gun sound moderator as claimed in  claim 1  which has a toroidal passage formed within the body for toroidal gas flow therethrough, the passage including at least one flow guide extending along within the toroidal passage. 
     
     
         25 . A gun sound moderator as claimed in  claim 10  which has a toroidal passage formed within the body for toroidal gas flow therethrough, the passage including at least one flow guide extending along within the toroidal passage. 
     
     
         26 . A gun sound moderator as claimed in  claim 24  in which the at least one flow guide comprises a fin or vane; optionally in which the fin or vane is generally planar; optionally in which at least one said fin or vane extends in a direction generally perpendicular to or perpendicular to the longitudinal axis of the body. 
     
     
         27 . A gun sound moderator as claimed in  claim 25  in which the at least one flow guide comprises a fin or vane; optionally in which the fin or vane is generally planar; optionally in which at least one said fin or vane extends in a direction generally perpendicular to or perpendicular to the longitudinal axis of the body. 
     
     
         28 . A gun having a gun barrel with a muzzle and a gun sound moderator as claimed in  claim 1  mounted at the muzzle. 
     
     
         29 . A gun having a gun barrel with a muzzle and a gun sound moderator as claimed in  claim 10  mounted at the muzzle.