Patent ID: 8291605
Filing Date: 2012-10-23
Classification: G01C,Y10T

Abstract:
1. A level comprising: an elongate hollow frame having an interior defined by first and second sidewalls and top and bottom walls each extending between the sidewalls; a central vial within a topnotch which is formed by removal of a topwall section and adjacent sections of each sidewall including notch-defining bottom and side edges; a frame-reinforcing external brace substantially spanning the distance between the top and bottom walls about the topnotch and including first and second plate members each against one of the sidewalls about the notch-defining bottom and side edges and each substantially spanning a respective one of the sidewalls, a fastening member extending through the sidewalls and pulling the plate members toward each other to sandwich the sidewalls therebetween, thereby reinforcing a central frame portion weakened by the removal of the topwall section forming the topnotch.