Gypsum board grooving system
AssigneeNational Gypsum Company
InventorWilliam S. Halligan
Life of this patent
Estimating the term…
Abstract
An apparatus and method for forming a flat-bottomed V-groove in wallboard involving a pair of oppositely angled circular saws, wherein saw blades have an obtusely angled outer edge, as by grinding back one corner of each of a plurality of carbide tips on at least one of the two saw blades.
Claims20
A wallboard grooving apparatus for forming an elongate, flat-bottomed V-groove comprising means for supporting and advancing wallboard closely adjacent a pair of circular saw assemblies, said circular saw assemblies being mounted at an angle, one to another, equal to the angle of a V-groove to be cut into said wallboard, circular saw blades on said saw assemblies disposed to cut a V-groove in advancing wallboard when said wallboard is advanced along said supporting and advancing means, an outer edge on at least one of said circular saws having an obtuse angle formed by said outer edge relative to a general plane of said circular saw, said obtusely angled outer edge being parallel to a top surface of said wallboard to form a flat bottom in a V-groove cut by said saws into said wallboard.
A method of forming a flat-bottomed, elongate V-groove with sidewalls in a flat surface of a wallboard comprising the steps of:
- providing a plurality of circular saw blades with at least one of said blades having a plurality of cutting tips with said tips all having an outer edge which is at an angle to the plane of the blade equal to the desired angle between one of said side walls and the flat bottom of said flat-bottomed, elongate V-groove, mounting a pair of circular saw assemblies adjacent and at suitable angles to a means for supporting an advancing wallboard to be grooved by said saw assemblies, at least one of said circular saw blades having said angled cutting tips, and advancing said wallboard along said supporting means wherein said angled cutting tips cut the flat bottom of said groove in said wallboard.
Dependencies are inferred from the claim text.