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    • 3. 发明授权
    • Rotary saw blade
    • 旋转锯片
    • US4766794A
    • 1988-08-30
    • US899677
    • 1986-08-25
    • Robert A. Blake
    • Robert A. Blake
    • B23D61/02B23D61/04B27B33/08
    • B23D61/04B23D61/021Y10T83/9348Y10T83/935Y10T83/9358
    • A radial saw blade is formed of a flat disc having peripheral edge including circular peripheral portions and recessed stepped peripheral portions. The peripheral edge includes spaced apart, radially inwardly extending notches. Each notch has a flat, plate-like insert brazed to an L-shaped seat in the notch facing the direction of rotation. Each insert has cutting edges formed on side edges of the inserts which extend axially from both sides of the disc and on a crown edge extending radially from the peripheral edge of the disc. The side and crown edges each have beveled surfaces extending away from the direction of rotation to define a relief angle. A first set of the notches are positioned about the circular peripheral portion of the peripheral edge. The inserts in the first set of notches make the primary cut in both linear and non-linear passes. A second set of notches are circumferentially spaced along the recessed peripheral portions, or stepped portions, of the blade and are located at different radial distances from the center of the disc. The side cutting edges of the inserts in the second set of notches radially overlap the side cutting edges of radially adjacent cutting inserts in the second set of notches. The inserts in the second set of notches plane the raw cut edges cut by the first set of inserts on straight cuts. The inserts in the second set of notches also cut in the axial direction relative to the disc for curved and diagonal cutting to prevent the blade from binding in the kerf by providing axial relief.
    • 径向锯片由具有圆周边缘和凹陷阶梯状周边部分的周缘的扁平盘形成。 周缘包括间隔开的径向向内延伸的凹口。 每个凹口具有平坦的板状插入件,其在面向旋转方向的凹口中钎焊到L形座。 每个插入件具有形成在插入件的侧边缘上的切割刃,其从盘的两侧轴向延伸并且在从盘的周边边缘径向延伸的冠缘上形成。 侧面和冠部边缘各自具有远离旋转方向延伸的倾斜表面,以限定一个仰角。 第一组凹口围绕周边边缘的圆形周边部分定位。 第一组凹口中的插入件在线性和非线性通道中进行初级切割。 第二组凹口沿着刀片的凹陷的周边部分或阶梯部分周向间隔开并且位于与盘的中心不同的径向距离处。 第二组凹口中的插入件的侧切割刃径向地与第二组凹口中径向相邻的切削刀片的侧切削刃重叠。 第二组凹口中的插入物将由直线切口上的第一组插入物切割的原始切割刃平面。 第二组凹口中的插入件也相对于盘沿轴向切割以进行弯曲和对角切割,以防止刀片通过提供轴向浮雕而在切口中结合。
    • 8. 发明授权
    • Cone beam synthetic arrays in three-dimensional computerized tomography
    • 锥形光束合成扫描仪阵列在三维计算机断层扫描
    • US5740224A
    • 1998-04-14
    • US564854
    • 1995-11-30
    • Martin MullerGonzalo R. ArceRobert A. Blake, Jr.
    • Martin MullerGonzalo R. ArceRobert A. Blake, Jr.
    • G01N23/04G01N23/083
    • G01N23/04Y10S378/901
    • The method of the present invention combines an ensemble of truncated partial cone beam projections to synthesize a complete virtual projection. The individual partial projections are obtained with CT scanners, where for each partial projection the investigated object is positioned at precise locations specified by formulas described in the present application (e.g., formulas (3), (4), (6) and (18) for linear cone beam synthetic scanner arrays or formulas (9)-(13), (20), (21) and (25)-(27) for circular cone beam synthetic scanner arrays). Prior to the actual reconstruction, the partial cone beam projections are combined to form a complete virtual projection, equivalent to a projection one would obtain by using a sufficiently large detector.
    • 本发明的方法组合了一组截锥部分锥形投影以合成完整的虚拟投影。 用CT扫描器获得各个部分投影,其中对于每个部分投影,被调查物体位于由本申请中描述的公式指定的精确位置(例如公式(3),(4),(6)和(18) 用于圆锥形束合成扫描器阵列的线性锥形束合成扫描器阵列或公式(9) - (13),(20),(21)和(25) - (27))。 在实际重建之前,将部分锥形束投影组合以形成完整的虚拟投影,等同于通过使用足够大的检测器获得的投影。