Flame injection throats for furnaces

DETAILED DESCRIPTION What is claimed is: 1.
A flame injection throat for a furnace comprising a furnace structure having an opening and at least one ring of refractory tiles lining the inner face of the opening forming the flame injection throat, the adjacent edge portions of the outer faces of selected adjacent tiles being formed with undercut grooves wider at the bottom than the top, said grooves extending inwardly from the adjacent end faces of the tiles in alignment with one another, pins having enlarged ends attached to the furnace structure within the throat opening and projecting into grooves in the tiles so that the enlarged ends are within the grooves and locking members fitted into the grooves and engaging simultaneously the undercut portions of the grooves in the tiles and the enlarged ends of the pins whereby to hold the tiles to the pins each of said locking members being a block of heat-resisting metal bifurcated along a portion of its length whereby to present two limbs arranged when fitted into a groove in a tile to straddle a pin projecting into the groove and simultaneously engage the undercut portion of the groove.
2.
A flame injection throat for a furnace incorporating several coaxial rings of refractory tiles lining the throat opening in which the tiles of at least selected rings are attached as claimed in claim 1.
3.
A flame injection throat as claimed in claim 1 in which one end face of each pair of adjacent end faces presented by adjacent tiles is formed with a tongue disposed in an axial direction with respect to the throat, the other end face being formed with a groove engaged by the tongue.
4.
A flame injection throat as claimed in claim 2 in which all the faces of the tiles of one ring forming one end face of the ring of tiles are formed with tongues, the abutting end faces of the tiles of the other ring being formed with grooves engaged by the tongues.
5.
A flame injection throat as claimed in claim 2 in which the abutting faces of adjacent tiles are stepped into one another