Airport runway or taxiway light fixture

An inpavement light fixture for mounting flush with payment of an airport runway or taxiway comprising:

• a cover assembly with a flat top surface, that extends to a peripheral edge of the cover assembly, and at least one window formed therein for passage of an output light beam, said cover assembly having a light channel formed in its top and extending from said at least one window towards an edge of said cover assembly, said light channel having a bottom that slopes at a small angle to said flat top surface and up to the plane of said flat top surface, said channel being confined to said cover assembly;
• an optical prism for projecting said output light beam mounted in said cover assembly adjacent said window;
• electric light means for beaming light into said prism and mounted in said fixture below at least the top surface of said cover assembly;
• and
• a fixture base on which the entire cover assembly is detachably mounted, wherein said cover assembly extends generally horizontally in use when the fixture is mounted in said pavement and the horizontal dimensions of said cover assembly correspond substantially to horizontal dimensions of a top portion of the base so that said cover assembly in use does not project a substantial horizontal distance beyond the top of said base.

An inpavement light fixture for mounting flush with pavement of an airport runway or taxiway comprising:

• a cover assembly with a flat top surface, that extends to a peripheral edge of the cover assembly, and at least one window formed therein for passage of an output light beam, said cover assembly having a light channel formed in its top and extending from said at least one window towards an edge of said cover assembly, said light channel having a bottom that slopes at a small angle to said flat top surface and being confined to said cover assembly;
• an optical prism for projecting said output light beam mounted in said cover assembly adjacent said window, said optical prism having three flat sides with each of said three sides extending at a 60 degree angle to the other two sides and two of said three sides sloping upwardly towards each other at a 60 degree angle to a horizontal plane, one of the two upwardly sloping sides being a highly reflective surface;
• electric light means for beaming light into said prism and mounted in said fixture below at least the top surface of said cover assembly;
• and
• a fixture base on which said cover assembly is detachably mounted, wherein said cover assembly extends generally horizontally in use when the fixture is mounted in said pavement and the horizontal dimensions of said cover assembly correspond substantially to horizontal dimensions of a top portion of the base so that said cover assembly in use does not project a substantial horizontal distance beyond the top of said base.

A light fixture for mounting in pavement of an airport runway or taxiway comprising:

• a cover with a generally flat top surface, said cover having opening for passage for an output light beam;
• an optical prism device mounted in said cover adjacent to said opening, said prism device incorporating therein a dichroic filter so that said output light beam has a desired colour, said prism device having three flat exterior sides with each extending at a 60 degree angle to the other two sides and one of said three sides sloping upwardly and extending across said opening;
• a bottom receptacle on which said cover is supported;
• and
• electric light means mounted in said fixture and arranged to beam light into said prism device from below said cover.