CN110774805A

CN110774805A - Compasses for teaching

Info

Publication number: CN110774805A
Application number: CN201911075416.9A
Authority: CN
Inventors: 关瑛; 杜肖叶
Original assignee: Shaanxi University of Science and Technology
Current assignee: Shaanxi University of Science and Technology
Priority date: 2019-11-06
Filing date: 2019-11-06
Publication date: 2020-02-11

Abstract

A compass for teaching, comprising: the fixed rod is connected with the rotary rod through the head part of the connecting piece; the interior of the connecting piece is hollow and used for determining the circle center; the fixed rod is provided with an accommodating groove, and the head part of the fixed rod is connected with the rotary rod in an embedded manner; a sliding groove is formed in the rotating rod, a sliding device is installed on the sliding groove, a cylinder is embedded in the center of the sliding device, and the cylinder is hollow and used for embedding chalk; the upper surface of the fixed rod is provided with a size mark, and the sliding device drives the cylinder to slide to draw the radius of the circle; when the compasses are accommodated, the fixed rod is embedded in parallel with the head of the rotary rod, so that the tail of the rotary rod is embedded into the tail of the fixed rod, and meanwhile, the sliding device also enters the accommodating groove of the fixed rod, so that the cylinder on the sliding device is tangent to the fixed rod. Draw the circular arc through the cooperation of dead lever and rotary rod, it is high to have the drawing precision, uses stable advantage.

Description

Compasses for teaching

Technical Field

The invention belongs to the technical field of compasses, and particularly relates to a compass for teaching.

Background

When drawing in classroom teaching, compasses are often used for standard drawing. In the drawing process, when a teacher uses a common compass to draw, the position of the compass is too high and the compass is too large, so that the fixed part of the compass can move during drawing, or the compass is inconvenient to rotate, and errors are easy to generate during drawing.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention aims to provide the compasses for teaching, which solve the displacement error of the fixed part of the compasses in the prior art and have the characteristics of simple structure, simple operation and convenience.

In order to achieve the purpose, the invention adopts the technical scheme that: a compasses for teaching comprises a fixed rod which is rotationally connected with a rotary rod through a connecting piece; one side of the fixed rod corresponding to the rotary rod is provided with an accommodating groove; a sliding chute is arranged in the rotating rod, and a sliding device is arranged on the sliding chute; a cylinder is arranged on the sliding device; the cylinder is used for mounting chalk.

The upper surface of the fixed rod is provided with scale marks.

The inside of the connecting piece is in a hollow shape and used for determining the circle center.

The cylinder is tangent to the fixed rod when the compasses are closed, and the tangent position of the cylinder is provided with nicks.

The center of the connecting piece is used for determining the center of a circle or an arc.

Compared with the prior art, the invention has the following advantages:

the circular drawing machine has the advantages of high drawing precision and stable use. Meanwhile, the compasses can be stored and are convenient to carry. And secondly, the tip position of the ordinary compass fixing part is removed, and the compass fixing rod can be parallel to the drawing surface, so that the compass is not easy to hurt people and draw when in use. Scales are arranged on the surface of the fixed rod, notches on the cylinder correspond to the scales, the radius is directly read and adjusted, the drawing efficiency is improved, and convenience is brought to people.

The compasses for teaching provided by the invention have the advantages that the fixed part of the compasses is not easy to slide, and meanwhile, the compasses have the capability of directly adjusting the radius, so that the time is greatly saved, and the error is reduced.

Drawings

FIG. 1 is a schematic structural view of a compass used for teaching of the present invention.

Fig. 2 is a cross-sectional view of the fixing rod of the present invention.

Fig. 3 is a schematic cross-sectional view of a rotary lever according to the present invention.

Fig. 4 is a schematic structural diagram of the slider of the present invention.

Fig. 5 is a schematic cross-sectional view of a connector of the present invention.

Fig. 6 is a schematic view of the scale on the holder and the score on the cylinder of the present invention.

Detailed Description

The structural and operational principles of the present invention are explained in further detail below with reference to the accompanying drawings.

Referring to fig. 1, 2, 3 and 1, a compass for teaching comprises a fixed rod 1, wherein the fixed rod 1 is rotatably connected with a rotating rod 2 through a connecting piece 5; one side of the fixed rod 1 corresponding to the rotary rod 2 is provided with an accommodating groove; a sliding chute is arranged in the rotating rod 2, and a sliding device 3 is arranged on the sliding chute; a cylinder 4 is arranged on the sliding device 3; the cylinder 4 is used for mounting chalk.

The upper surface of the fixed rod 1 is provided with scale marks. The interior of the connecting piece 5 is hollow and used for determining the circle center. The sliding device 3 drives the cylinder 4 to slide to draw the radius of the circle. When the compasses are accomodate, decide the parallel of pole 1 and 2 link of rotary rod and inlay, and because be equipped with the spout in the rotary rod 2 for in the pole 1 is decided in the rotary rod 2 embedding, slider 3 also gets into in the spout of deciding pole 1 simultaneously. The center of a circle is fixed by the center of the connecting piece 5, the fixed rod 1 rotates the rotating rod 2, and an arc is drawn by matching the fixed rod 1 and the rotating rod 2.

The cylinder 4 is tangent to the fixed rod 1 when the compasses are closed. The tangent of the cylinder 4 is scored.

The center of the connecting piece 5 is used for determining the center of a circle or an arc.

When the compasses are accommodated, the fixed rod is embedded in parallel with the head of the rotary rod, so that the tail of the rotary rod is embedded into the tail of the fixed rod, and meanwhile, the sliding device also enters the accommodating groove of the fixed rod, so that the cylinder on the sliding device is tangent to the fixed rod.

The fixed rod 1 is connected with a rotating rod 2 through a head part of a connecting piece 5; the interior of the connecting piece 5 is hollow and used for determining the circle center; the fixed rod 1 is provided with an accommodating groove, and the head part of the fixed rod 1 is connected with the rotating rod 5 in an embedded manner; a sliding groove is formed in the rotating rod 2, a sliding device 3 is installed on the sliding groove, a cylinder 4 is embedded in the center of the sliding device 3, and the cylinder 4 is hollow and used for embedding chalk. The upper surface of the fixed rod 1 is marked with a dimension, and the sliding device 3 drives the cylinder 4 to slide to draw the radius of a circle. When the compasses were accomodate, dead lever 1 was inlayed with 2 prelude parallels of rotary rod for 2 afterbody embedding dead lever 1 afterbody of rotary rod, slider 3 also got into the holding tank of dead lever 1 simultaneously, made cylinder 4 on the slider 3 tangent with dead lever 1. An arc is drawn by the cooperation of the fixed rod 1 and the rotating rod 2.

The fixing rod 1 and the rotating rod 2 are rotatably connected, and the upper surface of the fixing rod 1 is provided with dimension scales.

The rotating rod 2 is internally provided with a sliding groove for installing the sliding device 3. The sliding device 3 is provided with a hollow cylinder 4, and chalk can be embedded in the cylinder 4.

Referring to fig. 4, the cylinder 4 is tangent to the fixed rod 1 when the compasses are closed, and the tangent position of the cylinder 4 is provided with a nick 6.

The heads of the fixed rod 1 and the rotating rod 2 can be embedded. The center of the connecting piece 5 can be used for determining the center of the circular arc.

The working principle of the invention is as follows:

the center of the connecting piece 5 is aligned to the circle center to be drawn, and the fixed rod 1 is closely tangent to the drawing plane. With chalk embedding cylinder 4, drive slider device 3 through cylinder 4 and carry out the adjustment of position for the nick on the cylinder 4 is corresponding with the scale on the dead lever, and rotatory rotary rod 2 is drawn. After the drawing is completed, the drawing is rotated back to the initial position and stored.

Claims

1. A pair of compasses for teaching comprises a fixed rod (1), wherein the fixed rod (1) is rotatably connected with a rotating rod (2) through a connecting piece (5); one side of the fixed rod (1) corresponding to the rotary rod (2) is provided with an accommodating groove; a sliding chute is arranged in the rotating rod (2), and a sliding device (3) is arranged on the sliding chute; a cylinder (4) is arranged on the sliding device (3); the cylinder (4) is used for mounting chalk.

2. The compasses for teaching of claim 1, wherein the upper surface of said fixed bar (1) is provided with graduation marks.

3. Compasses for teaching according to claim 1, characterized in that said connecting element (5) is hollow inside.

4. The compasses of claim 1, wherein said cylinder (4) is tangent to said fixed shaft (1) when said compasses are closed, and the tangent position of said cylinder (4) is scored.