| 摘要 |
PCT No. PCT/GB86/00696 Sec. 371 Date Jul. 13, 1987 Sec. 102(e) Date Jul. 13, 1987 PCT Filed Nov. 11, 1986 PCT Pub. No. WO87/03081 PCT Pub. Date May 21, 1987.An airgun comprises a discharge chamber (3) for compressed air or gas. Compression of the air in the discharge tube is achieved by a pressurizing chamber (2) which contains pressurized gas or air. In one embodiment the discharge chamber (3) is filled by gas or air from the pressurizing chamber until a predetermined pressure within the discharge chamber is reached. A second embodiment provides liquefied gas in the pressurizing chamber that acts against a movable wall so as to ensure that the discharge chamber is at the liquefaction pressure.
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