Elliptic trammel

Abstract

The invention discloses an elliptic trammel. The elliptic trammel comprises a left supporting arm, a screw rod, a right supporting arm, an X-shaped hinge frame, an inverted-V-shaped hinge connecting rod, a hinge sliding block, a first fastening knob, a flexible rule box, a drawing pen and a pen carrying groove. The upper parts of the left supporting arm and the right supporting arm are connected through the V-shaped hinge connecting rod, a rotating handle is arranged at the top end of the upper part of the left supporting arm, a left focal foot is arranged on the lower part of the left supporting arm, and a right focal foot is arranged on the lower part of the right supporting arm; the flexible rule box is arranged on one side of the left focal foot; a flexible rule pressing plate is arranged on one side of the right focal foot, and the middle parts of the left supporting arm and the right supporting arm are connected through the X-shaped hinge frame and the hinge sliding block; and the drawing pen is fixed at the lower part of the right supporting arm through the pen carrying groove, and a flexible rule limiting part and a limiting thimble are arranged on the lower part of the drawing pen. The elliptic trammel is simple in structure and convenient to operate, ellipses with any eccentricity can be drawn according to needs, the needed circle radius can be directly obtained through a tape, a circle can be drawn, and a round paper sheet can be cut according to the size of the needed round paper sheet; and the elliptic trammel is high in innovation degree, high in practicability and suitable for popularization and application.

Description

technical field [0001] The invention relates to the field of convenient drawing tools, in particular to an ellipse gauge. Background technique [0002] In the current teaching classroom, it is easy to draw a circle with the help of a compass, but it is extremely inconvenient to make an ellipse with the right size and accurate eccentricity. The common ellipse gauge is composed of the bottom plate of the cross-shaped chute and the rotating rod. It is an ancient simple tool for drawing ellipses. It is relatively rigid and unrealistic to enter the classroom of students. At present, the relatively advanced ellipse gauge is based on the two legs of the compasses and uses a closed thread to complete the representation of the ellipse. It cannot really realize the ellipse drawing. It is necessary to make a suitable size and accurate eccentricity. The ellipse is almost impossible to achieve, and it does not serve students. According to the ellipse gauge known so far, there is no sui...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problem of difficulty in ellipse drawing, and to provide a convenient ellipse gauge that can be used to draw ellipses, draw circles with a pen, and cut circles with a pen knife.

Images