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1378 results about "Tongue and groove" patented technology

Tongue and groove is a method of fitting similar objects together, edge to edge, used mainly with wood, in flooring, parquetry, panelling, and similar constructions. Tongue and groove joints allow two flat pieces to be joined strongly together to make a single flat surface. Before plywood became common, tongue and groove boards were also used for sheathing buildings and to construct concrete formwork.

Low profile hardwood flooring strip and method of manufacture

A method of producing a hardwood flooring product, including the steps of processing a strip of raw wood into a blank having a predetermined thickness and width, and top and bottom surfaces defining parallel planes relative to each other, and splitting the blank along the width of the blank from one side to the other to form two low profile flooring strips having the same width as the blank and a thickness less than one-half the thickness of the blank. The splitting step includes the steps of providing first and second circular saw blades mounted on spaced-apart vertical axes for rotation in a single plane intermediate and parallel to the planes of the top and bottom surfaces of the blank and positioning the blank on conveying means upstream from the saw blades with the plane of rotation of the saw blades intermediate and parallel to the planes of the top and bottom surfaces of the blank for movement of the blank from an upstream position to a downstream position relative to the saw blades. The blank is moved downstream into the plane of rotation of the saw blades during rotation of the saw blades thereby horizontally splitting the blank to form first and second low-profile flooring strips. Interlocking members, such as molded, mating tongue and groove members, are molded into first and second longitudinally-extending side edges of the flooring strips for securing together the flooring strips when placed side-to-side to form a floor.
Owner:ARMSTRONG HARDWOOD FLOORING CO +2

Fire retardant panel door and door frame having intumescent materials therein

A fire retardant panel door and door frame that prevents the spread of fire through the door during a fire. The fire retardant panel door has at least one door panel and stiles and rails. The door panel includes an interior center composite section formed by a first plurality of layers of intumescent materials and a first plurality of layers of fire resistant materials disposed between and laminated to a pair of outer sections formed of wood for enclosing the interior center composite section to form a composite laminated door panel. Each of the stiles includes a first center core formed of wood enclosed by a second plurality of layers of intumescent materials and a second plurality of layers of fire resistant materials; and the second layers of intumescent and fire resistant materials are enclosed by a first applique layer formed of wood to form a composite laminated stile. Each of the rails includes a second center core formed of wood enclosed by a third plurality of layers of intumescent materials and a third plurality of layers of fire resistant materials; and the third layers of intumescent and fire resistant materials are enclosed by a second applique layer formed of wood to form a composite laminated rail. The first, second, and third plurality of layers of intumescent materials are activated to expand upon exposure to heat and/or fire to prevent the heat and/or fire from passing through at least one door panel, the stiles and the rails of the panel door during a fire for at least 90 minutes. At least one door panel is connected to the panel door by tongue and groove joints; and the tongue and groove joints have a fourth plurality of layers of intumescent materials and a fourth plurality of layers of fire resistant materials in the tongue and groove joints; and wherein the fourth plurality of layers of fire resistant materials in the tongue and groove joints are activated to expand upon exposure to heat and/or fire to seal the joints in order to prevent the heat and/or fire from passing through the panel door during a fire for at least 90 minutes.
Owner:ATRISTIC DOORS & WINDOWS
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