Patent ID: 6173540
Filing Date: 2001-01-16
Classification: B32B,E04F

Abstract:
In a stair case comprised of alternating vertical risers and horizontal treads, an improved tread comprising; a tread member having a core layer of wood strips oriented in a first direction and a top layer and a bottom layer of wood strips irreversibly bonded under heat and pressure to said core layer oriented in a second direction transverse to said first direction, said top layer and said bottom layer having parallel spaced top and bottom surfaces establishing a cross sectional thickness, said tread member having parallel laterally spaced side walls and parallel transversely spaced front and rear walls, said front wall having a cylindrical curvature extending between and continuous with said top layer and said bottom layer, said curvature being surface finished to reduce exposure of said layers to ambient moisture, said bottom surface including an elongated groove formed parallel to and closely adjacent said outer surface of said front wall said groove having a thickness substantially the same as the thickness of said tread member whereby a riser for the stair case may be positioned and retained therewithin.