公开(公告)号：US06405443B1

公开(公告)日：2002-06-18

申请号：US09552502

申请日：2000-04-19

申请人： Joseph P. Thorn ,  Kevin J. Anderson

发明人： Joseph P. Thorn ,  Kevin J. Anderson

IPC分类号： B43L904

CPC分类号： B43L9/04

摘要： A geometric construction device forms circles or arcs with a marking instrument and simultaneously measures angles. The device includes a radius arm and a rotatable member. The radius arm includes a means for receiving the marking instrument and a disc having a pivot point and being rotatable about the pivot point. The disc is used to attach the rotatable member to the radius arm. The rotatable member in combination with the radius arm forms a 360° protractor. The rotatable member has a plurality of radius holes in it for receiving the marking instrument. These radius holes may be used to form circles or arcs with the radius being less than or equal to the radius of the disc. The 360° protractor is capable of measuring degrees between 0° and 360° while circles or arcs are being formed.

摘要翻译： 几何构造装置用标记工具形成圆或圆弧，同时测量角度。 该装置包括半径臂和可旋转构件。 半径臂包括用于接收标记仪器的装置和具有枢转点并可围绕枢转点旋转的盘。 盘用于将可旋转构件附接到半径臂。 与半径臂组合的可旋转构件形成360°量角器。 可旋转构件在其中具有多个半径孔，用于接收标记仪器。 这些半径孔可用于形成半径小于或等于圆盘半径的圆或弧。 360°量角器能够在圆形或弧形形成之间测量0°和360°之间的角度。