Rear aperture sight for rifle

Abstract

A rear aperture sight for use in conjunction with a front sight post sight on a rifle. The front sight post has a horizontal top edge and vertical side edges. The rear aperture sight comprises a rear sight adapted to be mounted on the rifle. The rear sight has a horizontally elongated aperture formed therein having height and width dimensions. The width dimension is greater than the height dimension. The aperture is defined by two circular segments s 1 and s 2 having chords c 1 and c 2, respectively, defined by included angles θ 1 and θ 2, respectively, of circles having radii R 1 and R 2, respectively. The chords c 1 and c 2 have heights h 1 and h 2, respectively. Radii R 1 and R 2 and angles θ 1 and θ 2 are selected such that chords c 1 and c 2 are of equal length. The circular segments are positioned such that chords c 1 and c 2 are co-linear and oriented horizontally.

1 . A rear aperture sight for use in conjunction with a front sight post sight on a rifle, the front sight post having a horizontal top edge and vertical side edges, said rear aperture sight comprising:
 a rear sight adapted to be mounted on the rifle,   said rear sight having a horizontally elongated aperture formed therein having a height h and a width w, said width w being greater than said height h,   said height h being of such a value that said aperture is adapted to cause the horizontal top edge of the front sight post and a horizontal edge of a target to be sharply focused,   said width w being of such a value that said aperture is adapted to permit a sufficient amount of light to pass therethrough so that the front sight post and the target are bright,   wherein said aperture is defined by two circular segments s 1  and s 2  having chords c 1  and c 2 , respectively, defined by included angles θ 1  and θ 2 , respectively, of circles having radii R 1  and R 2 , respectively, said chords c 1  and c 2  having heights h 1  and h 2 , respectively,   wherein said radii R 1  and R 2  and said angles θ 1  and θ 2  are selected such that said chords c 1  and c 2  are of equal length,   wherein said circular segments are positioned such that said chords c 1  and c 2  are co-linear and oriented horizontally.   
   
   
       2 . The sight of  claim 1  wherein R 1 =R 2 =R and θ 1 =θ 2 =θ. 
   
   
       3 . The sight of  claim 1  wherein R 1 ≠R 2  and θ 1 ≠θ 2 . 
   
   
       4 . The sight of  claim 1  wherein w=c 1 =c 2 , w being in a range of about 0.011 inch to about 0.20 inch, and wherein h=h 1 +h 2 , h being in a range of about 0.010 inch to about 0.100 inch. 
   
   
       5 . A rifle having a receiver and a barrel, said rifle comprising:
 a front sight post mounted on said barrel of said rifle, said front sight post having a horizontal top edge and vertical side edges,   a rear sight mounted on said receiver of said rifle,   said rear sight having a horizontally elongated aperture formed therein having a height h and a width w, said width w being greater than said height h,   said height h being of such a value that said aperture causes said horizontal top edge of said front sight post and a horizontal edge of a target to be sharply focused,   said width w being of such a value that said aperture permits a sufficient amount of light to pass therethrough so that said front sight post and the target are bright,   wherein said aperture is defined by two circular segments s 1  and s 2  having chords c 1  and c 2 , respectively, defined by included angles θ 1  and θ 2 , respectively, of circles having radii R 1  and R 2 , respectively, said chords c 1  and c 2  having heights h 1  and h 2 , respectively,   wherein said radii R 1  and R 2  and said angles θ 1  and θ 2  are selected such that said chords c 1  and c 2  are of equal length,   wherein said circular segments are positioned such that said chords c 1  and c 2  are co-linear and oriented horizontally.   
   
   
       6 . The rifle of  claim 5  wherein R 1 =R 2 =R and θ 1 =θ 2 =θ. 
   
   
       7 . The rifle of  claim 5  wherein R 1 ≠R 2  and θ 1 ≠θ 2 . 
   
   
       8 . The rifle of  claim 5  wherein w=c 1 =c 2 , w being in a range of about 0.011 inch to about 0.20 inch, and wherein h=h 1 +h 2 , h being in a range of about 0.010 inch to about 0.100 inch. 
   
   
       9 . A combination rear aperture sight and front sight post sight for use on a rifle, said combination comprising:
 a front sight post adapted to be mounted on a barrel of the rifle, said front sight post having a horizontal top edge and vertical side edges,   a rear sight adapted to be mounted on the rifle,   said rear sight having a horizontally elongated aperture formed therein having a height h and a width w, said width w being greater than said height h,   said height h being of such a value that said aperture causes said horizontal top edge of said front sight post and a horizontal edge of a target to be sharply focused,   said width w being of such a value that said aperture permits a sufficient amount of light to pass therethrough so that said front sight post and the target are bright,   wherein said aperture is defined by two circular segments s 1  and s 2  having chords c 1  and c 2 , respectively, defined by included angles θ 1  and θ 2 , respectively, of circles having radii R 1  and R 2 , respectively, said chords c 1  and c 2  having heights h 1  and h 2 , respectively,   wherein said radii R 1  and R 2  and said angles θ 1  and θ 2  are selected such that said chords c 1  and c 2  are of equal length,   wherein said circular segments are positioned such that said chords c 1  and c 2  are co-linear and oriented horizontally.   
   
   
       10 . The combination of  claim 9  wherein R 1 =R 2 =R and θ 1 =θ 2 =θ. 
   
   
       11 . The combination of  claim 9  wherein R 1 ≠R 2  and θ 1 ≠θ 2 . 
   
   
       12 . The combination of  claim 9  wherein w=c 1 =c 2 , w being in a range of about 0.011 inch to about 0.20 inch, and wherein h=h 1 +h 2 , h being in a range of about 0.010 inch to about 0.100 inch. 
   
   
       13 . A rear aperture sight for use in conjunction with a front sight post sight on a rifle, the front sight post having a horizontal top edge and vertical side edges, said rear aperture sight comprising:
 a rear sight adapted to be mounted on the rifle,   said rear sight having a horizontally elongated aperture formed therein having a height h and a width w, said width w being greater than said height h,   said height h being of such a value that said aperture is adapted to cause the horizontal top edge of the front sight post and a horizontal edge of a target to be sharply focused,   said width w being of such a value that said aperture is adapted to permit a sufficient amount of light to pass therethrough so that the front sight post and the target are bright,   wherein said aperture is defined by two overlapping circles having respective centers A and B, a distance between said centers A and B being AB, said overlapping circles having overlapping circular segments s 1  and s 2  which have chords c 1  and c 2 , respectively, said chords c 1  and c 2  oriented vertically,   wherein w is equivalent to a sum of AB, R 1 , and R 2 , and   wherein h is equivalent to twice a greater of R 1  and R 2 .   
   
   
       14 . The sight of  claim 13  wherein AB, R 1 , and R 2  are selected such that h is in a range of about 0.010 inch to about 0.100 inch, and w is in a range of about 0.011 inch to about 0.20 inch.