Gun barrel

Abstract

A gun barrel is provided, including: a barrel body, having a passage therethrough, the passage being provided for a bullet member to be received and pass therethrough, two opposite ends of the passage of the barrel body being respectively formed with a bullet inlet and a bullet outlet formed by an inner wall of the barrel body surroundingly and continuously arranged, a circumferential face of the barrel body being formed with an opening, the opening being near the bullet inlet; a tangential portion, disposed at the opening restrictedly and partially movably protrusive into the passage, the tangential portion for providing friction with a surface of the bullet member tangentially; at least one vent hole, disposed through the barrel body and being near the bullet outlet.

What is claimed is: 
     
         1 . A gun barrel, including:
 a barrel body, having a passage therethrough, the passage for a bullet member to be received and pass therethrough, two opposite ends of the passage of the barrel body being formed respectively with a bullet inlet and a bullet outlet formed by an inner wall of the barrel body surroundingly and continuously arranged, a circumferential face of the barrel body being formed with an opening, the opening being near the bullet inlet;   a tangential portion, disposed at the opening restrictedly and partially movably protrusive into the passage, the tangential portion for providing friction with a surface of the bullet member tangentially;   at least one vent hole, disposed through the barrel body and being near the bullet outlet.   
     
     
         2 . The gun barrel of  claim 1 , wherein the bullet outlet is annularly formed with a conic opening which is tapered gradually inward. 
     
     
         3 . The gun barrel of  claim 1 , wherein a plurality of the vent holes are disposed through the barrel body, and the vent holes are arranged in intervals. 
     
     
         4 . The gun barrel of  claim 3 , wherein the vent holes are arranged along an axial direction of the barrel body in intervals. 
     
     
         5 . The gun barrel of  claim 3 , wherein the vent holes are disposed annularly around the circumferential face on a radial plane of the barrel body. 
     
     
         6 . The gun barrel of  claim 1 , wherein the vent hole is round, oval or elongate. 
     
     
         7 . The gun barrel of  claim 1 , wherein the tangential portion is pushably movable into the passage. 
     
     
         8 . The gun barrel of  claim 1 , wherein the inner wall of the barrel body is further formed with a ramp, and the ramp is arranged at the bullet inlet and gradually ascends from the bullet inlet toward an interior of the passage. 
     
     
         9 . The gun barrel of  claim 8 , wherein the ramp is integrally recessed on the inner wall of the barrel body and disposed substantially along an axial direction of the barrel body, the ramp has two opposite slant sides, an end of the ramp extends to the bullet inlet, the slant sides of the ramp are provided for the surface of the bullet member to be abutted thereagainst, and a vent gap is formed between a ramp face of the ramp and the surface of the bullet member. 
     
     
         10 . The gun barrel of  claim 1 , wherein the barrel body further includes at least one blind guiding slot which is disposed between the bullet outlet and the vent hole, the blind guiding slot is recessed on the circumferential face of the barrel body, an end of the blind guiding slot is communicated with the vent hole, and the other end of the blind guiding slot extends to a distal side of the bullet outlet and is communicated with outside. 
     
     
         11 . The gun barrel of  claim 1 , wherein the vent hole is axially elongate and trapped radially inward, and the blind guiding slot is axially elongate and aligned with the vent hole axially.