Protractor
    3.
    发明授权
    Protractor 失效
    量角器

    公开(公告)号:US06553676B1

    公开(公告)日:2003-04-29

    申请号:US09723597

    申请日:2000-11-28

    IPC分类号: B43L710

    CPC分类号: B43L7/10

    摘要: A protractor comprising a frame and a lever arm coupled thereto. The frame includes a first substantially straight edge and an elongate track adjacent to the first edge. The lever arm includes a second substantially straight edge and a channel which mateably engages the track of the frame. The channel/track combination couples the lever arm to the frame and permits the lever arm to rotate about an axis substantially orthogonal to the first and second edges. The first and second edges intersect at a point allowing a user to describe an angle between the two edges.

    摘要翻译: 分度器,包括框架和与其连接的杠杆臂。 框架包括第一基本上直的边缘和与第一边缘相邻的细长轨道。 杠杆臂包括第二基本上直的边缘和可适应地接合框架的轨道的通道。 通道/轨道组合将杠杆臂连接到框架,并允许杠杆臂围绕基本上与第一和第二边缘正交的轴线旋转。 第一和第二边缘在允许用户描述两个边缘之间的角度的点处相交。