Panelling for covering walls and floors has individual planks with projections and recesses alternate sides cut inclined to centre to fit together leaving inclined gap for shrinkage tolerance

摘要

The individual planks (2, 3) which make up the panelling have on alternate sides a projection (11) which closes horizontally with the top (8) and bottom (9) sides of the plank, and a corresponding recess (12). The projections are cut roughly in the middle of the planks parallel to each other and inclined so that when fitting together two planks and abutting the projections and recess against each other by their head faces an inclined gap remains between the inclined faces .