Patent ID: 7369302

Claim:
A day/night weapon sight assembly for use on a weapon without change in eye relief comprising: an optical sight support for supporting a day/night weapon sight on an object stationary with respect to said optical sight support; an optical sight tube for use at daytime rigidly supported by said optical sight support, said optical sight tube having an objective end that during use of the optical sight tube faces a target and an ocular end that faces a viewer eye, said optical sight tube having an optical axis and a predetermined eye relief during use; an image intensifier tube for use at nighttime which is supported by said optical sight support moveably with respect to said optical sight tube, said image intensifier tube having an objective end that during use of the optical sight tube faces a target and an ocular end that faces the viewer eye, said image intensifier tube having an optical axis and having an inoperative position where said optical axis thereof is not in alignment with said optical axis of said optical sight tube and an operative position where said image intensifier tube is installed between the viewer eye and said ocular end of said optical sight tube; and a shifting mechanism that allows displacement of said optical sight support in the direction away from the viewer eye when said image intensifier tube is installed by said switching mechanism in said operative position without changing said eye relief.