Patent ID: 8201813

Claim:
A fixture for mounting a head window to a frame for use within a periscope system, said fixture comprising: a baseplate wherein said baseplate includes at least three sections recessed from a face of said baseplate; a clamping plate defining an aperture and including a recessed portion outside of said aperture wherein said recessed portion comprises an oval-shape shaped for the head window, said recessed portion being formed on one side of said clamping plate opposite the face of said baseplate and said recessed portion having a inner perimeter as an inner edge of the oval shape and an outer perimeter as an outer edge of the oval shape, with said clamping plate including a plurality of feet extending from said outer perimeter into said aperture with each of said feet including a groove having said outer perimeter of said recessed portion as an outer edge of said groove and said inner perimeter of said recessed portion as an inner edge of said groove; a plurality of guide members capable of constraining relative movement of said clamping plate with respect to said baseplate for movement toward and away from said baseplate; and at least three dial indicator gages secured to said clamping plate with a sensing end of each of said gages extending to each said recessed section of said baseplate with said gages operable for measurement of said relative movement between said clamping plate and said baseplate; wherein the head window is capable of access through said aperture; wherein said feet are capable of resting on the head window when the head window is in place and wherein said feet are capable of bonding the head window to said clamping plate.