Patent Publication Number: US-4481861-A

Title: Fire adjustment device designed to be mounted on the end of a gun barrel

Description:
FIELD OF THE INVENTION 
     This invention relates to a fire adjustment device designed to be mounted at the end of the barrel of a gun and usable on any type of sporting gun, with superimposed or adjacent barrels, and of automatic gun. 
     SUMMARY OF THE INVENTION 
     In accordance with one feature of the invention, the device includes a support frame, means to mount said frame at the end of the barrel, and at least a tube adjustably positionned on said frame in alignment with the barrel and having a bore corresponding to the gun gauge, adjusting means allowing the angle of the tube axle to be changed in relation to the barrel axle. 
     According to another feature of the invention, for twin barrel guns, the device of the invention includes two tubes symmetrically mounted on the support frame. 
     The device once positionned at the end of the barrel, adjusting the elevation, e.g. by means of micrometer screws acting on either tube at will, causes a diverging or converging effect of both tubes to be obtained, thereby adjusting with a very high accuracy the range of sporting gun or shotgun barrels and therefore allowing the user to obtain for any sort of shooting as well as for any sporting targets the fire adjustment the best adapted thereto. 
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
     These and further advantages of the invention will be more readily understood when the following description is read in connection with the appended drawings, wherein: 
     FIG. 1 is a side elevational view of the device of the invention, assembled at the end of a twin barrel gun; 
     FIGS. 2 and 3 are end and top plan views, respectively, of the device shown in FIG. 1, and 
     FIGS. 4 and 5 are end and side views, respectively, of a guide tube of the device shown in FIGS. 1 to 3. 
    
    
     The device according to the invention includes a support frame, generally designated by reference numeral 1 and made for instance of steel and including a base 2 designed to be inserted in the end of barrels 3, and two parallel spaced flanges 4, 4&#39; extending said base 2. In the embodiment illustrated, base 2 is bicylindrically shaped with parallel flat flanks and internally defines two parallel cylindrical chambers 5, adapted to receive the ends of twin barrels 3. The side walls of base 2 are extended in the forward direction by both parallel flanges 4 and 4&#39;, which are cut so as to define, at the level of cylindrical chamber 5 axle, semicylindrical bearing means 6 which act as hinges for guide tubes 7, 7&#39;. Support frame 1 is firmly positionned on the ends of barrels 3, e.g. by means of a transversal securing screw sketched at 8. 
     Each tube 7, 7&#39;, made for instance out of tempered steel, includes a tubular part 9, defining a bore 10 identical to that of barrels 3, and on each side of said cylindrical part 9, a pair of opposed pivots 11 centered on the longitudinal axle of said cylindric part 9 and disposed near the tube end, and two opposed mounting blocks 12, laterally projecting at the level of the tube median part. In the assembled position of both tubes on support frame 1, pivots 11 are accomodated in bearing means 6, said mounting blocks 12 being received in housings cut in the intermediate portion of flanges 4, 4&#39; and defining a seating bottom 13 connected to an orthogonal shoulder 14 by a curved part 15 corresponding to a rounded lower side portion 16 of blocks 12. A micrometer screw, figured at 17, associated with each block 12 allows the angle between the axle of cylindrical part 9 of tubes 7 and the axle of the corresponding barrel 3 to be changed within a limited range in a pivoting movement around axle 18 of pivots 11, illustrated by arrow X, both tube 7 and 7&#39; being finally locked in the choosen angular position by locking screws passing through flanges 4, 4&#39; and figured at 19. 
     While only a particular embodiment of the invention has been described and claimed herein, it is apparent that various modifications and alterations of the invention may be made. 
     It is therefore the intention in the appended claims to cover all such modifications and alterations as may fall within the true spirit and scope of the invention.