Plug For Gun Recoil Mechanism

Abstract

In a recoil mechanism for a gun having a frame with a barrel, a slide that is movable rearwardly of the frame and barrel when the gun is fired, and a main recoil spring, the improvement is a plug having an inner cylindrical surface with a helical groove for receiving and thereby deactivating the bias of a plurality of turns of the main recoil spring, the recoil spring having a plurality of turns threaded into the helical groove for deactivating the bias of the plurality of turns during a firing of the gun.

1 . In a recoil mechanism for a gun having a frame with a barrel and a slide that is movable rearwardly of the frame and barrel, when the gun is fired, the improvement comprising:
 a plug having an inner cylindrical surface with helical groove for receiving and thereby deactivating a bias of a plurality of turns of a main recoil spring; and   a main recoil spring having a plurality of turns threaded into said helical groove for deactivating the bias of the plurality of turns during a firing of the gun.   
   
   
       2 . In a recoil mechanism of  claim 1 , wherein the groove and the spring each having a pitch, the pitch of the groove and the spring being different for better fixing the plug against relative rotation with respect to the spring. 
   
   
       3 . In a recoil mechanism of  claim 1 , wherein the groove and the spring each having a pitch, the pitch of the groove and the spring being different for better fixing the plug against relative rotation with respect to the spring, the groove having a semi-cylindrical cross-section that is deeper than a radius of a wire making up the spring. 
   
   
       4 . In a recoil mechanism of  claim 1 , the plug including a front chamber for receiving a front portion of the spring, the plug having an intermediate chamber between the front and rear chambers which contains the helical groove. 
   
   
       5 . The recoil mechanism of  claim 1 , including a plug having an inner cylindrical surface with a helical groove for receiving and thereby deactivating a bias of a plurality of turns of the spring, the plug including a rear chamber for receiving a rear portion of the spring for free compression of the rear portion of the spring, the plug including a front chamber for receiving a front portion of the spring, the plug having an intermediate chamber between the front and rear chambers which contains the helical groove, the groove and the spring each having a pitch, the pitch of the groove and the spring being different for better fixing the plug against relative rotation with respect to the spring, the groove having a semi-cylindrical cross-section that is deeper than a radius of a wire making up the spring. 
   
   
       6 . In a recoil mechanism of  claim 1 , the plug including a rear chamber for receiving a rear portion of the spring for free compression of the rear portion of the spring, the plug including a front chamber for receiving a front portion of the spring, the plug having an intermediate chamber between the front and rear chambers which contains the helical groove.