CN105984260A - Multifunctional drawing tool for mathematics teacher - Google Patents

Abstract

The invention relates to a teaching aid and particularly relates to a multifunctional drawing tool for a mathematics teacher. The multifunctional drawing tool comprises a ruler, a circular plate and a semicircular plate, wherein the middle of the circular plate is hollowed; a plurality of concentric circular rings are arranged at the hollowed part and are connected with a protractor; the protractor is connected with the ruler; an extended line at the upper end of the ruler passes through the original point of the protractor; an arc-shaped groove is formed in the peripheral wall of the protractor; a straight strip groove is formed in the ruler; the arc-shaped groove communicates with the straight strip groove; an auxiliary scale is arranged in the straight strip groove; an extended line at the upper end of the auxiliary scale passes through the original point of the protractor; an arc-shaped slide block is arranged at the left end of the auxiliary scale and is located in the arc-shaped groove; the auxiliary scale can make circular motion around the original point of the protractor; and circle drawing holes are also formed in the ruler. According to the multifunctional drawing tool, the ruler is combined with the protractor, and the auxiliary scale is also assisted, so that a straight line can be drawn, an angle can be measured, an angle with known angularity can be drawn, and circles with different diameters can also be drawn, so that the multifunctional drawing tool is a multipurpose object and is simple in use and convenient to carry.

Description

A kind of math teacher multifunctional drawing tool

(1) technical field

The present invention relates to a kind of teaching aid, particularly to a kind of math teacher multifunctional drawing tool.

(2) background technology

Although science and technology is flourishing at present, a lot of schools all use multimedia teaching, but some aspect need nonetheless remain for using original educational aid, such as draw, the most preferably to be taught by doing and illustrating by teacher, on-the-spot by teacher draws to children's impression intuitively, reinforcement understands, conventional drawing tools includes ruler, set square, protractor etc., and each of which is individually present, and brings inconvenience to carrying of teachers.

(3) summary of the invention

The present invention is in order to make up the defect of prior art, it is provided that a kind of math teacher multifunctional drawing tool easy to carry.

The present invention is achieved through the following technical solutions:

nullA kind of math teacher multifunctional drawing tool，It is characterized in that: include ruler、Plectane，Described plectane is made into integration by protractor and semi-circular plate，Circular openwork part is had in the middle of described plectane，The described circular center of circle of openwork part overlaps with the initial point of protractor，It is provided with some donuts in described circular openwork part，The center of circle of these donuts overlaps with the initial point of protractor，Wherein minimum annulus can only hold chalk and insert，Described donut is connected with protractor by connecting rod，The right-hand member of described protractor is fixing with the left end of ruler to be connected，The initial point of the extended line throughput hornwork of the upper end of described ruler，Arcuate groove is had on the arcuate perimeter wall of described protractor，The cross section of described arcuate groove is convex shape，Vertical bar shaped groove is had in the upper end wall of described ruler，Described arcuate groove is connected with vertical bar shaped groove，It is provided with auxiliary scale in described vertical bar shaped groove，The initial point of the extended line throughput hornwork of the upper end of described auxiliary scale，The left end of described auxiliary scale is provided with arc shaped slider，Described arc shaped slider is positioned at arcuate groove，Described auxiliary scale can move in a circle with the initial point of protractor；Described ruler is provided with some picture circular holes.

The invention has the beneficial effects as follows:

Ruler and protractor are combined by the present invention, have again the help of auxiliary scale, portray straight line, can also portray the angle of known angle by measuring angle, it is also possible to draw the circle of different-diameter, one-object-many-purposes, use simple and easy to carry.

(4) accompanying drawing explanation

The present invention is further illustrated below in conjunction with the accompanying drawings.

Fig. 1 is the plan structure schematic diagram of the present invention；

Fig. 2 be in Fig. 1 A to the cross section structure schematic diagram of arc groove；

Fig. 3 be in Fig. 1 B-B to cross section structure schematic diagram.

In figure, 1 protractor, 2 rulers, 3 auxiliary scales, 4 arcuate grooves, 5 vertical bar shaped grooves, 6 arc shaped sliders, 7 plectanes, 8 semi-circular plates, 9 circular openwork parts, 10 donuts, 11 connecting rods, 12 draw circular hole.

(5) detailed description of the invention

Accompanying drawing is the specific embodiment of the present invention.nullSuch as Fig. 1、Fig. 2、Shown in Fig. 3，This kind of math teacher multifunctional drawing tool，Including including ruler 2、Plectane 7，Plectane 7 is made into integration by protractor 1 and semi-circular plate 8，Circular openwork part 9 is had in the middle of plectane 8，The circular center of circle of openwork part 9 overlaps with the initial point of protractor 1，It is provided with some donuts 10 in circular openwork part 9，The center of circle of these donuts 10 overlaps with the initial point of protractor 1，Wherein minimum annulus can only hold chalk and insert，Donut 10 is connected with protractor 1 by connecting rod 11，The right-hand member of protractor 1 is fixing with the left end of ruler 2 to be connected，Preferably it is made into integration，The upper end of ruler 2、Namely there is the initial point of the extended line throughput hornwork 1 on one side of graduation mark，Arcuate groove 4 is had on the arcuate perimeter wall of protractor 1，The cross section of arcuate groove 4 is convex shape，Vertical bar shaped groove 5 is had in the upper end wall of ruler 2，Arcuate groove 4 is connected with vertical bar shaped groove 5，The right-hand member of arcuate groove 4 at least extends to downwards bottom vertical bar shaped groove 5，Auxiliary scale 3 it is provided with in vertical bar shaped groove 5，The initial point of the extended line throughput hornwork 1 of the upper end of described auxiliary scale 3，That is when auxiliary scale 3 is positioned at vertical bar shaped groove 5，Their upper end-face edge is concordant，The left end of auxiliary scale 3 is provided with arc shaped slider 6，Arc shaped slider 6 is positioned at arcuate groove 4，The center of circle of the arc of arc shaped slider 6 overlaps with the initial point of protractor 1，Auxiliary scale 3 can move in a circle with the initial point of protractor 1；Some picture circular holes 12 it are additionally provided with on ruler 2.

The present invention can draw straight line, angle, the angle of angulation, draw the angle of known angle, draw the circle of different-diameter, draw bowlder, can be by the present invention by round with drawing with coloured chalk on blackboard, piece of chalk can also be inserted in minimum annulus in as the center of circle, another chalk is placed on the intersection of other donuts and connecting rod, pushes the present invention with another chalk and draw circle；Draw bigger bowlder, then being inserted into by piece of chalk in the annulus of minimum is the center of circle, is inserted in picture circular hole picture circle with another chalk the most permissible.

In addition to technical characteristic described in description, remaining technical characteristic is all known to a person skilled in the art technology.

Claims (1)

1. null1. a math teacher multifunctional drawing tool，It is characterized in that: include ruler (2)、Plectane (7)，Described plectane (7) is made into integration by protractor (1) and semi-circular plate (8)，Circular openwork part (9) is had in the middle of described plectane (7)，The center of circle of described circular openwork part (9) overlaps with the initial point of protractor (1)，It is provided with some donuts (10) in described circular openwork part (9)，The center of circle of these donuts (10) overlaps with the initial point of protractor (1)，Wherein minimum annulus can only hold chalk and insert，Described donut (10) is connected with protractor (1) by connecting rod (11)，The right-hand member of described protractor (1) is fixing with the left end of ruler (2) to be connected，The initial point of extended line throughput hornwork (1) of the upper end of described ruler (2)，Arcuate groove (4) is had on the arcuate perimeter wall of described protractor (1)，The cross section of described arcuate groove (4) is convex shape，Vertical bar shaped groove (5) is had in the upper end wall of described ruler (2)，Described arcuate groove (4) is connected with vertical bar shaped groove (5)，It is provided with auxiliary scale (3) in described vertical bar shaped groove (5)，The initial point of extended line throughput hornwork (1) of the upper end of described auxiliary scale (3)，The left end of described auxiliary scale (3) is provided with arc shaped slider (6)，Described arc shaped slider (6) is positioned at arcuate groove (4)，Described auxiliary scale (3) can move in a circle with the initial point of protractor (1)；Described ruler (2) is provided with some picture circular holes (12).