Compasses for drawing concentric circles

同心圆圆规

  • Inventors: FENG ZHENG
  • Assignees: 冯正
  • Publication Date: December 10, 2014
  • Publication Number: CN-203995321-U

Abstract

本实用新型涉及一种同心圆圆规,包括第一支板、与第一支板顶部铰连的第二支板、设置在第一支板和第二支板中部的调节固定板、设置在第二支板底端的画圆装置;所述第一支板为伸缩杆,所述第一支板和第二支板铰接处设置有第一锁紧装置;所述画图装置由横向板、在横向板上沿横和向板长度方向的滑槽、第一画臂和第二画臂构成;所述第一画臂和第二画臂通过第二锁紧装置安装于滑槽内;所述横向板与第二支板底端固定。使用时首先根据要求,调节好两个画臂间的距离,同时以一个画臂为参照物,调节好圆的半径,调节完成后,将吸盘与黑板相吸,沿第一支板绕行一周,完成同心圆的绘制,在绘制过程中省时省力,同时减少偏差。
The utility model relates to a pair of compasses for drawing concentric circles. The pair of the compasses comprises a first support plate, a second support plate hinged to the top of the first support plate, an adjusting fixing plate arranged in the middle of the first support plate and the middle of the second support plate, and a circle drawing device arranged at the bottom of the second support plate. The first support plate is a telescopic rod, a first locking device is disposed on the hinge portion of the first support plate and the second support plate, the circle drawing device comprises a transverse plate, a sliding groove, a first drawing arm and a second drawing arm, the sliding groove is formed in the transverse plate in the length direction of the transverse plate, the first drawing arm and the second drawing arm are installed in the sliding groove through a second locking device, and the transverse plate is fixed to the bottom end of the second support plate. When the compasses are used, the distance between the two drawing arms is adjusted according to requirements, one drawing arm serves as a reference object, the radius of a circle is adjusted, a suction cup is attracted to a blackboard after adjustment, the other drawing arm moves around the first support plate for one turn to finish drawing of the concentric circles, time and labor are saved in the drawing process, and meanwhile deviations are reduced.

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