| 摘要 |
Novelty: a piston speargun with elastics is disclosed. Constitution: elastics complex 2 (elastics, piston head and sealing accessory) placed and calked at the main body of the speargun 3, into the cylindrical cavity intended to operate as a piston cylinder (3,1) and create a waterproof variable-length compartment. The handle (4,1)is assembled at the end of the cylinder wherein the elastics complex is calked. The head (4.4)-which is assembled at the other end of the main body- leaves open the mouth of the cylinder (4.4.1) and bears pulleys (4.4.2) through which two cords fixed at the piston head transmit the bearer of the elastics return forces coefficient to the speargun side where the rod-arrow (4.5) is encountered. Advantages: into the sealing variable-length compartment, the surface of the elastics is not subjected to hydrostatic forces independently of the sea depth where the speargun is used. Throughout submarine fishing, water is ingressing the cylinder through the open mouth thereof so that hydrostatic pressure is exerted on the head of the piston and forces are, thereby, developed the coefficient of which is down-stream with the coefficient of the elastics return forces so that the range of the speargun is augmented upon augmentation of the final force coefficient going along with the sea depth augmentation. |
