Spear gun with retractable string mechanism

Abstract

The spear fishing gun with a reliable and effective retractable mechanism is provided. The spear gun consists of the gun shaft, firing device, handle (including grip) and gripped trigger, retractable spear mechanism, and the stopper of string to prevent the spear, from ramming into the retractable string device during retraction. As soon as the spear is shot and the diver sees that he misses, he presses on the spring trigger retracting string mechanism and the spear comes back to the gun. If the spear pierces the fish, the diver can now press the retractable string device to either release the string or retracts it to collect the fish. The retractable string mechanism is equipped with a large spool which allows the diver to shoot at long along with short distances. The spool does not allow the string to unwind completely and waste time to rewind. This is regulated by a controlling button. There is also a screw which adjusts spring power and regulates the speed and looseness of the string during retraction while the stopper prevents the spear from ramming into the retractable string device during retraction. The stopper is a plastic, metal, or glass ball, or it may have other shape. Diameter or section of the stopper is larger than that of the string guide of the retractable mechanism. The same screw which is used for regulating spring power also functions as the on and off button for the retractable string mechanism. The invention is suitable for both general types of the spear fishing guns: (a) the rubber-powered, or sling-type spear gun, and (b) the pneumatic spear gun, which utilizes an air-driven piston to drive the spear shaft down a rifle-like barrel.

1 . The spear gun with a retractable string mechanism consisting of: 
 (a) a spear gun,    (b) an automatic retractable string mechanism fixed at the spear gun,    (c) a projectile, and    (d) a string which has an end captive in the retractable mechanism and another end fixed at the projectile.    
   
   
       2 . The spear gun with the retractable string mechanism according to  claim 1 , wherein said automatic retractable string mechanism comprises: 
 (a) a water-resistant housing,    (b) a spool,    (c) a spring inside the spool for automatical retracting the string,    (d) a string guide,    (e) a fixture for adjusting the length of string,    (f) a screw of adjusting spring power,    (g) a portable holder for manual retracting the string, and    (h) a stopper to prevent ramming the spear into the retractable string mechanism.    
   
   
       3 . The spear gun with the retractable string mechanism according to claims  1  and  2 , wherein the screw of adjusting spring power is also turn on/off switch of the spring to release the spool before the spear shot.  
   
   
       4 . The spear gun with the retractable string mechanism according to  claim 2 , wherein said string guide has a regulator of the gap to adjust the guide gap to a diameter of the string.