| 摘要 |
A tool for use when laying out lines on stair stringers or roof rafters along which cuts are to be made. The step and rafter tool includes a framing square, an angle bracket and two carriage bolts with washers and wingnuts. Each leg of the framing square has a longitudinal slot which is about 90% of the length of the leg. The angle bracket has two central longitudinal slots in the first flange, each of which is about 40% of the length of the angle bracket. The angle bracket is positioned against the framing square so that two carriage bolts are place within holes formed by the overlapping slots of the bracket and square with washers and wingnuts assembled therein. With the wingnuts loose, the angle bracket can be positioned wherever is desired with respect to the framing square and then the wingnuts are tightened. The second flange of the angle bracket now provides a shoe which can slide on the narrow side of a board to be marked and cut for use as a stair stringer or a roof rafter, and thereby stabilize the framing square in place to act as a marking guide. Various indicia, guide marks and data tables are engraved into the legs of the framing square to aid in set up and marking. The edges of the slots in the framing square also provide useful marking guides which are a known distance from other outer or inner edges of the framing square legs. |
