Adjustable mechanical sighting mechanism for firearms

Abstract

An adjustable mechanical sighing mechanism for firearms has a sight blade mount defining an internal passage having first and second outwardly flaring passage end surfaces. An adjustment screw having an external tapered surface is in engagement with the first of the outwardly flaring passage end surfaces. A sight blade structure defines a sight adjustment member having an internally threaded screw passage that receives the adjustment screw. A lock nut is threaded onto the adjustment screw and has an external tapered surface in engagement with the second outwardly flaring passage end surface. The sight blade mount defines a slot through which a support for the sight adjustment member is movable, providing for windage adjustment of the sight blade structure by rotation of the adjustment screw. The tapered surfaces of the adjustment screw and lock nut provide for locking of the sight blade at any desired position.

1 . An adjustable mechanical sighting mechanism for firearms, comprising:
 a sight blade mount defining an internal passage having first and second outwardly flaring passage end surfaces;   an adjustment screw having an external tapered surface disposed in engagement with said first of said outwardly flaring passage end surfaces;   a sight blade member defining an internally threaded screw passage being received in operative blade moving engagement with said adjustment screw; and   a lock nut being threaded to said adjustment screw and having an external tapered surface disposed in engagement with said second of said outwardly flaring passage end surfaces.   
     
     
         2 . The adjustable mechanical sighting mechanism of  claim 1 , comprising:
 tightening of said lock nut onto said adjustment screw causing increase of engagement force of said external tapered surfaces of said adjustment screw and said lock nut with said first and second outwardly flaring passage end surfaces.   
     
     
         3 . The adjustable mechanical sighting mechanism of  claim 1 , comprising:
 tightening of said lock nut onto said adjustment screw causing application of tensile forces to said adjustment screw.   
     
     
         4 . The adjustable mechanical sighting mechanism of  claim 1 , comprising:
 said sight blade mount defining an elongate slot having communication with said internal passage;   a support member being defined by said sight blade structure and being movable within said elongate slot; and   an adjustment member being supported within said internal passage by said support member and being moved to selected positions within said internal passage by said adjustment screw.   
     
     
         5 . The adjustable mechanical sighting mechanism of  claim 4 , comprising:
 said elongate slot defining spaced elongate nose sections on said sight blade mount; and   said adjustment member defining an internally threaded screw passage receiving said adjustment screw therein and being moved within said internal passage upon rotational movement of said adjustment screw.   
     
     
         6 . The adjustable mechanical sighting mechanism of  claim 5 , comprising:
 forcible reaction of said tapered surfaces of said adjustment screw and lock nut with said first and second outwardly flaring passage end surfaces upon tightening rotation of said lock nut causing friction induced locking of said sight blade member against inadvertent movement thereof from any adjusted position relative to said sight blade mount.   
     
     
         7 . The adjustable mechanical sighting mechanism of  claim 5 , comprising:
 said spaced elongate nose sections being flexible; and   said forcible reaction of said tapered surfaces of said adjustment screw and lock nut with said first and second outwardly flaring passage end surfaces causing flexing of said spaced elongate nose sections and subjecting said adjustment screw to tensile forces.   
     
     
         8 . The adjustable mechanical sighting mechanism of  claim 5 , comprising:
 a sight mount base having a dove-tail mount projection for mounting engagement within a dove-tail mounting slot of a firearm;   said sight blade mount being pivotally mounted to said sight mount base; and   at least one spring member being interposed between said sight mount base and said sight blade mount and urging said sight blade mount in one pivotal direction; and   a retainer and elevation adjustment screw securing said sight blade mount and being rotatably adjusted for overcoming the force of said spring member and establishing a selective adjusted elevation position of said sight blade mount and said sight blade member.   
     
     
         9 . An adjustable mechanical sighting mechanism for firearms, comprising:
 a sight blade mount defining an internal passage and defining an elongate slot in communication with said internal passage, said sight blade mount defining locking surfaces;   a sight blade member defining a sighting slot and having a support moveable within said elongate slot and having an adjustment member movable within said internal passage by said support and defining an internally threaded adjustment screw passage;   an adjustment screw having an external tapered surface disposed in engagement with said first outwardly flaring passage end surface and being threaded within said internally threaded adjustment screw passage, selective rotation of said adjustment screw moving said adjustment member within said internal passage, moving said support within said elongate slot and moving said sight blade member with respect to said sight blade mount;   a lock nut being threaded to said adjustment screw; and   said adjustment screw and said lock nut being disposed for locking engagement with said locking surfaces upon tightening of said lock nut on said adjustment screw.   
     
     
         10 . The adjustable mechanical sighting mechanism of  claim 9 , comprising:
 said internal passage being defined in part by first and second outwardly flaring passage end surfaces;   said adjustment screw defining a tapered external surface disposed for engagement with said first outwardly flaring passage end surface;   said lock nut defining a tapered external surface disposed for, engagement with said second outwardly flaring passage end surface; and   tightening of said lock nut on said adjustment screw developing forcible engagement of said tapered external surfaces of said adjustment screw and said lock nut with said first and second outwardly flaring passage end surfaces and locking said sight blade member against inadvertent movement.   
     
     
         11 . The adjustable mechanical sighting mechanism of  claim 9 , comprising:
 said spaced elongate nose sections being flexible; and   forcible reaction of said tapered surfaces of said adjustment screw and lock nut with said first and second outwardly flaring passage end surfaces responsive to tightening of said lock nut causing flexing of said spaced elongate nose sections and subjecting said-adjustment screw to tensile forces.   
     
     
         12 . The adjustable mechanical sighting mechanism of  claim 8 , comprising:
 said tapered external surfaces of said adjustment screw and lock nut having different angles of taper as compared with the angles of taper of said first and second outwardly flaring passage end surfaces resulting in contact of outer edges of said tapered external surfaces of said adjustment screw and lock nut with said first and second outwardly flaring passage end surfaces providing metal to metal engagement therebetween at said outer edges.   
     
     
         13 . The adjustable mechanical sighting mechanism of  claim 8 , comprising:
 a sight mount base having a dove-tail mount projection for mounting engagement within a dove-tail mounting slot of a firearm;   said sight blade mount being pivotally mounted to said sight mount base; and   at least one spring member being interposed between said sight mount base and said sight blade mount and urging said sight blade mount in one pivotal direction; and   a retainer and elevation adjustment screw securing said sight blade mount and being rotatably adjusted for overcoming the force of said spring member and establishing a selective adjusted elevation position of said sight blade mount and said sight blade member.