| 摘要 |
This invention relates to a fume extractor ( 10 ) for extracting fumes from a bore ( 12 ) of a barrel ( 14 ) of a gun and comprising an annular main reservoir ( 16 ); an annular inlet reservoir ( 18 ); and an annular auxiliary reservoir ( 20 ), all concentrically surrounding the barrel ( 14 ) and being in communication with each other and the bore ( 12 ). The inlet reservoir ( 18 ) is sandwiched between the main reservoir ( 16 ) and the barrel ( 14 ). The auxiliary reservoir ( 20 ) is sandwiched between the main reservoir ( 16 ) and the barrel ( 14 ) and is located adjacent the inlet reservoir ( 18 ) on a muzzle brake end thereof. The arrangement is such that the main reservoir ( 16 ) is pressurised when the gun is fired and such that the fumes in the bore ( 12 ) are extracted by the release of pressure in the main and auxiliary reservoirs ( 16 ) and ( 20 ), after the projectile has left the barrel ( 14 ). The communication between the inlet reservoir ( 18 ) and main reservoir ( 16 ) consists of plurality of ports ( 24 ) distributed circumferentially each port being provided with a check valve ( 30 ).
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