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US 4,730,914 AGranted
Elongate, arcuate mirror with generally convex surface portions
AssigneeSafety Cross Mirror Co., Inc.
InventorThomas R. Stout
Life of this patent
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AssigneeSafety Cross Mirror Co., Inc.
InventorThomas R. Stout
Estimating the term…
An elongate, arcuate mirror with generally convex surface portions is provided, particularly for school busses. One of the mirrors is preferably provided at each front corner of the school bus to enable the driver to have visual access to the area in front of the bus hood as well as to the sides of the bus. The mirror has a transparent sheet with a generally convex surface and a generally concave surface with the sheet having a reflective coating on the concave side. The sheet has a constant radius in a longitudinal direction of predetermined value throughout a central portion of the mirror with the central portion being about one-half the peripheral length of the mirror. The sheet has a constant radius of predetermined value in a transverse direction throughout the same central portion of the mirror which exceeds the value of the longitudinal radius. The ends of the sheet beyond the central portion have generally segmental spherical shapes with a radius about equal to the value of the fixed transverse radius. The mirror provides the viewer with a larger reflective view with substantially less distortion than mirrors heretofore known.
An elongate, convex mirror comprising a transparent sheet with a convex surface and a concave surface, said sheet having a reflective layer on the concave surface, said sheet having a substantially constant longitudinal radius of predetermined value throughout a central portion of said mirror, said sheet having a substantially constant transverse radius of a value exceeding the value of said longitudinal radius throughout the same central portion of said mirror, end portions of said sheet beyond said central portion to the ends thereof having generally segmental spherical shapes, said mirror being symmetrical about a longitudinal plane taken centrally through said mirror.
An elongate, convex mirror comprising a transparent sheet with a convex surface and a concave surface, said sheet having a reflective layer on the concave surface, said sheet having a substantially constant longitudinal radius of a predetermined value throughout a central portion of said sheet defining a central included angle of about fifty degrees to about seventy degrees, said sheet having a substantially constant transverse radius of a predetermined value which exceeds the value of said longitudinal radius throughout the same portion of said sheet, end portions of said sheet beyond said central portion to both ends of said sheet having a longitudinal radius substantially equal to the value of said constant transverse radius and having a transverse radius substantially equal to the value of said constant transverse radius.
An elongate, arcuate, convex mirror comprising a transparent sheet having a convex surface and a concave surface, said sheet having a layer of reflective material on the concave surface, said sheet having a longitudinal radius of about nine inches through a central included angle of about sixty degrees, said sheet having a transverse rdaius of about ten inches throughout the same central included angle of about sixty degrees, end portions of said sheet, beyond the central included angle, to the ends of said sheet having a longitudinal radius of about ten inches, and a transverse radius of about ten inches.
Dependencies are inferred from the claim text.