Underwater repeating spear gun

A repeating spear gun for launching spears having integral propulsion mechanisms ignitable by mechanical impact, comprising:

• a breech;
• a launching tube assembly connected to the breech in an assembled mode of the spear gun, the launching tube assembly comprising a plurality of firing tubes, each firing tube having a rear end disposed substantially adjacent the breech in the assembled mode of the spear gun and each firing tube containing, in a loaded condition thereof, a spear having a propulsion mechanism positionable substantially adjacent the rear end of the firing tube, the launching tube assembly selectively positionable to dispose at least two selected firing tubes simultaneously in a firing position;
• bolt means supported by the breech and characterized as comprising a plurality of firing pins, each firing pin supported on a respective reaction face, for impacting one firing pin against and igniting the propulsion mechanism of one spear prior to such impact between another firing pin and propulsion mechanism so that the force of the exhaust gas of the ignited propulsion mechanism and the impact with the ignited spear will exert upon the reaction face associated with the impacted firing pin a braking force to prevent sufficient impact between another firing pin and a propulsion mechanism to effect ignition of any other spear;
• and
• biasing means supported by the breech for urging the bolt means toward the propulsion mechanism.

A repeating spear gun for launching self-propelled spears, comprising:

• a breech;
• a magazine supported by the breech in an assembled mode of the spear gun and comprising:
• a plurality of primary firing chambers, each containing a spear in a loaded condition thereof, each said spear retainingly positionable at a launching position in its respective primary firing chamber;
• and
• a plurality of auxiliary firing chambers equal in number to the number of primary firing chambers, one each of said auxiliary firing chambers radially aligned with one of the primary firing chambers to form therewith a radial set of firing chambers, each of said auxiliary firing chambers containing a spear in a loaded condition thereof, each spear retainingly positionable at a launching position in its respective auxiliary firing chamber;
• a bolt supported by the breech for movement toward the magazine and having a rest position and a firing position, the bolt characterized as comprising:
• a primary firing pin mounted on the bolt and disposed to be positionable by movement of the bolt in striking engagement with a spear disposed in a primary firing chamber positioned in the firing path of the bolt, the primary firing pin disposed by the bolt a predetermined first firing pin distance from the launching position of the primary firing chamber positioned in the firing path when the bolt is in the rest position;
• and
• an auxiliary firing pin mounted on the bolt and disposed to be positionable by movement of the bolt in striking engagement with a spear disposed in an auxiliary firing chamber positioned in the firing path of the bolt, the auxiliary firing pin disposed by the bolt a predetermined second firing pin distance from the launching position of the auxiliary firing chamber positioned in the firing path when the bolt is in the rest position;
• and
• biasing means supported by the breech for forcefully urging the bolt toward the magazine along the firing path when the bolt is moved to the firing position and released therefrom, the first firing pin distance being greater than the second firing pin distance so that the primary firing pin is caused to ignitingly impact a spear in the primary firing chamber positioned in the firing path in the loaded condition thereof whereupon spear propulsion gas and spear impact absorb the movement of the bolt to prevent simultaneous firing impact of the auxiliary firing pin with a spear in the auxiliary firing chamber position in the firing path, and so that the auxiliary firing pin is caused to ignitingly impact a spear in said auxiliary firing chamber when no spear is in a primary firing chamber.