Patent ID: 9134084
Filing Date: 2015-09-15
Classification: F41A

Abstract:
1. A muzzle brake for stabilizing the muzzle end of a firearm barrel and reducing felt recoil of the firearm, comprising: an elongate inner tube having a cylindrical wall, said inner tube having a plurality of exhaust ports along its longitudinal dimension, said plurality of exhaust ports penetrating through the cylindrical wall of said inner tube at an angle generally between 2-7° canted forward from the perpendicular to the longitudinal axis of said inner tube; and an outer shield tube having an inner diameter that is larger than an outer diameter of said elongate inner tube, said outer shield tube being coaxially mountable relative to said elongate inner tube in a manner such that said outer shield tube substantially circumferentially surrounds said elongate inner tube, said outer shield tube comprising an unperforated metal tube; said inner tube having a threaded screw fitting generally on the proximal circumferential inner surface of said inner tube, said threaded screw fitting being configured for attachment of said muzzle brake to a firearm barrel; said inner tube further defining a plenum, wherein said plenum is formed as a space generally distal to said threaded screw fitting on the proximal circumferential inner surface of said inner tube, and wherein the diameter of said plenum approximates the diameter of a firearm muzzle; said inner tube further having an inner tube bore generally integral with and distal to said plenum, and wherein said inner tube bore is open to the atmosphere at its distal end and has a diameter between 0.001-0.50 inches larger than the diameter of a projectile that passes therethrough; said inner tube having a generally hexagonal shape at the distal end of said inner tube, for aiding in disconnecting said outer shield tube from said inner tube when said muzzle brake is operatively assembled and attached to a firearm barrel; said inner tube further having a threaded screw fitting on the proximal circumferential outer surface of said inner tube; said outer tube having a threaded screw fitting on the proximal circumferential inner surface of said outer shield tube configured for connection of said outer shield tube to said inner tube; the proximal outer surface of said outer tube being provided with a plurality of machined slots orthogonally spaced around the proximal outer surface of said outer shield tube, said plurality of machined slots having a semi-elliptical shape, said plurality of machined slots being configured for aiding in the installation and removal of said outer shield tube; said inner tube further comprising a circumferential flange at its proximal end that affects a sealing engagement with the proximal end of said threaded screw fitting on the circumferential proximal inner surface of said outer shield tube, wherein the distal end of said inner tube extends beyond the distal end of said outer shield tube, such that a fractional portion of some of said a plurality of exhaust ports located closest to the distal end of said inner tube are not wholly enclosed by said outer shield tube; and said outer tube and said inner tube defining a gas expansion chamber therebetween, said gas expansion chamber being formed as a space between the outer surface of said inner tube and the inner surface of said outer shield tube, wherein a transverse cross-sectional surface area of said gas expansion chamber is at least three times larger than a coplanar cross-sectional surface area of said inner tube bore.