US Patent 9920539 Adjustable arch measuring tool and associated use thereof

An adjustable arch measuring tool measures an arcuate curvature of one of a window and a door and thereby assists a user to layout a radius of the arcuate curvature on an existing cutting surface. The adjustable arch measuring tool includes a first member having an arcuate slot defining an adjustable fulcrum axis formed at a proximal end thereof, a second member having an aperture formed at a proximal end thereof, and a fastener removably inserted through the aperture and selectively locked along a curvilinear longitudinal length of the arcuate slot. Advantageously, the second member is selectively pivoted about the adjustable fulcrum axis defined along the arcuate slot of the first member. With the use of reference points and guide pins, each half of the arch can be easily drawn directly on the working surface.