A slingshot type spear gun for underwater fishing comprises a rod, a guide for an arrow at the forward end of the rod, and a pistol grip trigger mechanism at the rear end of the rod. A sleeve slidably mounted on the rod has one end of the rubber bands used for propelling the arrow fastened thereto, one pair of cross bars extending sidewise, and a mechanism for automatically releasably locking the sleeve to the rod. In order to cock the gun, the sleeve is pulled backwardly along the rod to a position in which the yoke at the free ends of the rubber bands may be easily engaged in a notch on the arrow. Thereafter, the sleeve is shifted forwardly along the rod by the user, pushing it with the feet bearing on the cross bars, until it reaches the desired loading degree of the rubber bands. The locking mechanism will automatically lock the sleeve in the desired position, against the action of the rubber bands.
A power load for use with an underwater spear gun including a casing, explosive material within the casing, the casing having one closed end adapted to open when the explosive material explodes. The closed end is sealed with a sealing compound to prevent water from penetrating the casing. The closed end may be crimped closed or closed by means of a wad or plug of suitable material. The sealing compound may be a silicone rubber or polylvinylchloride which permeates the closed end.
A spear gun and a power load for use therewith, the spear gun including a breech, a barrel fixed to the breech, and a spear adapted to be received by a bore within the barrel. The breech includes a chamber for receiving an explosive power load, the chamber being in fluid communication with the bore. The spear is sized to substantially prevent the flow of gas between the spear and the bore and may include a gas restrictor proximate one end to further reduce the flow of gas past the spear. The power load has no projectile and includes an explosive sealed to prevent water damage to the explosive. A line retainer adapted to be carried by the spear includes a plurality of pins urged toward the spear, the pins being adapted to be received in a reduced portion of the spear.
A speargun apparatus includes a rearward stock portion including a spear engaging structure; a forward stock portion including a speargun body and sling mount and a spear propulsion sling; and a hydraulic drive mechanism interconnecting the rearward stock portion and the forward stock portion for separating the rearward stock portion and the forward stock portion to increase tension in the sling. The forward stock portion preferably includes a longitudinal passageway and the rearward stock portion preferably includes a forwardly protruding guide rod slidably fitting into the longitudinal passageway for strengthening and stabilizing the apparatus when the forward stock portion and the rearward stock portion are separated. The rearward stock portion preferably includes the hydraulic drive mechanism base containing a fluid accumulation reservoir, a plunger slidably extensible from the base under pressure of hydraulic fluid within the reservoir, and a fluid pump for delivering fluid into the reservoir under pressure greater than atmospheric pressure. The rearward stock portion preferably contains a cavity and the base is retained within the cavity, and the plunger has a plunger forward end and the plunger forward end is preferably secured to the forward stock portion.
A spear fishing gun having a receiver assembly that has a grip housing containing a removable trigger assembly with a spear point shaft latch bar, a trigger, and a safety pawl mounted on a shaft extending through the trigger assembly and the grip housing with an external operator, with the shaft being supported in the grip housing in a manner to increase its stability. The grip housing has a line holding and release assembly that is automatically tensioned as it is assembled to the grip housing, and a muzzle assembly is provided that permits the lateral insertion and removal of the spearpoint shaft.
