| 摘要 |
PCT No. PCT/AU91/00456 Sec. 371 Date Apr. 15, 1993 Sec. 102(e) Date Apr. 15, 1993 PCT Filed Oct. 4, 1991 PCT Pub. No. WO92/07229 PCT Pub. Date Apr. 30, 1992.A spear-gun is disclosed which can be loaded by holding the butt end in the hands and moving a slider forwards with the feet to extend a spring. This allows a person of given strength to more easily load the gun or to store more energy in the spring than would be possible with a conventional arm-loaded gun. The gun comprises a barrel (32) with a pistol-grip (30) at the butt end and a head (34) adapted to guide the spear. The spring comprises two rubbers (36) arranged on either side of the barrel and aligned with its axis, the forward ends of the rubbers being connected to a forward slider (40) adapted to slide on the barrel and the rear ends being connected to a rear slider (42) also adapted to slide on the barrel. The forward slider (40) is fitted with releasable non-return dogs (47) that normally prevent it from moving rearwards along the barrel, while the rear slider (42) is adapted to be retained by trigger-operated catches (43). The gun is operated by manually releasing nonreturn dogs (47) and moving both sliders (40 and 42) and the rubbers (36) rearwards until the rear slider (42) is engaged by trigger catches (43). The butt (30) of the gun is then grasped by the hands and foot stops (46) on forward slider (40) are engaged by the feet and moved forward to extend the rubbers (36). The spear is then placed in position with its butt engaging a socket (44) on rear slider (42). The gun is aimed and the trigger operated to release catches (43) and the rear slider (40) to effect the discharge of the spear.
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