Sighting device for firearm with correction of target lateral movement

Claim 1

Firearm sighting device for use by an operator of a firearm with correction of lateral movement of a target, comprising: a sight defining a focal plane and having a graticule defining a horizontal spider line within said focal plane; first means coupled to said sight for displaying a reference mark within said focal plane at one location on the horizontal spider line; second means coupled to said sight for displaying at least one displacement mark within said focal plane at a location on the horizontal spider line different from the location of the reference mark; a range finder for measuring a firing distance; a range finder control knob means for controlling said range finder; means coupled to the range finder for calculating a projectile flight time from the measurement of the firing distance by the range finder; means coupled to the flight time calculating means for storing said projectile flight time; time measuring means for providing an elapsed target displacement time interval; a first control member for starting the time measuring means and for starting said second displaying means, said first control member being adapted to be actuated by the firearm operator when the target seen in the sighting device held in a fixed position is superimposed with said reference mark; a second control member for stopping said time measuring means and for stopping said second displaying means, said second control member being adapted to be actuated by the firearm operator when the target seen in the sighting device held in a fixed position is superimposed with said at least one displacement mark; means controlled by said first control member for causing a predetermined displacement of said at least one displacement mark within said focal plane towards said reference mark and for starting said time measuring means; means for inhibiting said means for causing the displacement of said at least one displacement mark upon actuation of said second control member and for stopping said time measuring means; means for storing an elapsed target displacement time interval as measured by said starting and stopping of said time measuring means; means for projecting a location of at least one cross velocity adjusted mark within said focal plane on said horizontal spider line in relation to the calculated projectile flight time and in relation to the calculated target displacement time; and third means for displaying said at least one cross velocity adjusted mark within said focal plane at said location on said horizontal spider line determined by said projecting means.