View limiting dial and ring structure for combination locks and the like

A combination lock dial and ring assembly for combination locks and the like for limited range top reading of the dial indicia by reflected light rays only, comprising a rotatable dial member having a circular dial portion and a knob formation projecting forwardly therefrom, the dial portion including a rearwardly facing annular indicia bearing surface adjacent said periphery having rearwardly facing dial graduations and mirror image reversed dial numerals thereon, said annular indicia bearing surface defining a frustro-conical annulus outwardly bounded by the circular periphery of the dial portion and lying in a rearwardly convergent cone of revolution concentric with the center axis of the dial inclined at substantially the same angle to said center axis as the cone of revolution of said mirror surface and in the opposite direction, and a dial ring having a forwardly facing dial receiving cylindrical well encircled by an integral shielding surround ring formation over a sufficient extent to exclude observation of the dial graduations and numerals laterally and below the dial portion and having an interruption of limited circumferential extend providing a sight opening for observation of the dial graduations and numerals in a restricted observation zone generally above and vertically aligned with the axis of the dial member, the rear surface of the dial receiving well having an arcuate light-reflecting mirror surface carried on and conforming to the shape of said rear surface at least spanning the arcuate extent of said sight opening positioned to reflect light rays from said dial graduations and numerals along reflection ray paths extending along upwardly and forwardly inclined paths to said restricted observation zone for visual observation of the rearwardly facing numerals and dial graduations confronting the mirror surface.