| 摘要 |
A discharge mechanism for pressurised gas comprising a piston 11 slidably mounted in a housing 10. The housing defines a first chamber 14 for the gas to be discharged and the piston 11 is able to slide along an axis within the housing 10 between charging and discharged positions. In the charging position, pressurised gas in the first chamber 14 exerts no force on the piston 11 in the axial direction. The housing may defines a second chamber 19 configured such that pressurised fluid in the second chamber 19 may exert a force on the piston 11 to move it towards the discharged position. The first chamber 14 may be located outside the volume of the piston 11. Pressurised fluid in the second chamber 19 may exert a force on the piston 11 in an opposite direction to the discharge of gas pressurised by the first chamber 14. There may be seals 15, 16, 20 sealing the first 14 and second 19 chambers; a seal in the first chamber 14 in the forward direction may also seal the second chamber 19 in the rearward direction. This mechanism may be used in a gun, cannon or launcher. |
