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    • 6. 发明授权
    • Calibrated bevel square with integrated electronic level and plumb
    • 具有集成电子水平和铅垂的校准斜面方形
    • US5452522A
    • 1995-09-26
    • US289726
    • 1994-08-12
    • Donald D. KookGary R. SchultheisJohn R. StaussDouglas R. Grundstrom
    • Donald D. KookGary R. SchultheisJohn R. StaussDouglas R. Grundstrom
    • B25H7/02G01C9/06B43L7/12G01C17/00
    • B25H7/02G01C9/06
    • A framing layout tool includes two squares each with two legs or blades 90.degree. apart. The squares are pivotally attached at their vertices by a pivot pin including a knurled locking nut. One of the squares includes a longitudinally aligned electronic plumb and level indicator on one of the legs. The other leg of that square includes indicia on a leg reference edge for indicating rise-over-run integers representative of the angular separation of that other leg and a leg of the other square. Indicia indicating the actual angle between such legs is also contained on an opposite reference edge of that other leg. The layout tool has particular utility for accurately marking the location of a plumb cut, seat cuts and a ridge cut in roof rafters where the blade of the second square is placed on an inclined rafter and oriented with the electronic level in a vertical plumb position. When a visual and auditory indication of exact plumb is obtained the clamping nut is locked. Using the locked device, the angle of inclination can be read and locked unit used to scribe cutting lines on a rafter to have the same inclination as the first measured rafter.
    • 一个框架布局工具包括两个方块,每个方块有两条腿或刀片,相差90°。 正方形通过包括滚花锁定螺母的枢轴销在其顶点枢轴连接。 其中一个方块包括一条腿上的纵向排列的电子铅垂和液位指示器。 该正方形的另一条腿包括腿参考边缘上的标记,用于指示代表该另一条腿和另一方的腿的角度间隔的上升整数。 指示这种腿之间的实际角度的标记也包含在该另一条腿的相对的参考边缘上。 布局工具具有用于准确地标记铅锤切割位置,座椅切口和在屋顶椽子中切割的位置的位置,其中第二方形面的刀片放置在倾斜的椽子上并且将电子水平定位在垂直铅垂位置。 当获得准确铅垂的视觉和听觉指示时,夹紧螺母被锁定。 使用锁定装置,倾斜角度可以被读取,并且用于在椽子上刻划切割线的锁定单元具有与第一测量椽子相同的倾斜度。