CN210680228U - Combined drawing device for mathematical education - Google Patents

Abstract

A combination formula drawing ware for mathematical education. The method for drawing the triangle is that a teacher draws one line by one line through the set squares, and because each set square is only in a fixed shape, the teacher needs to draw a circle by using compasses which are inconvenient in the drawing process. The utility model discloses the constitution includes: this a combination formula drawing ware for mathematical education includes protractor (1), set up triangle-shaped opening (2) on the protractor, triangle-shaped opening is inside to be put tripod (6) and to be connected through pivot (5) with the bottom of tripod, the tripod is inside to have branch (4), the left side of protractor, right side and top all are fixed with stabilizer blade ware (3), bar hole (8) have been seted up to the corresponding position department of every stabilizer blade ware, the stabilizer blade ware is including fixing riser (9) of the vertical arrangement in bar hole both sides, on the riser with spill slide (10) sliding connection, wear to be equipped with stand (11) on the slide and with stand rotatable coupling. The utility model is used for mathematical education's combination formula drawing.

Description

Combined drawing device for mathematical education

The technical field is as follows:

the utility model relates to a combination formula drawing ware for mathematical education.

Background art:

when mathematics teaching is carried out, teachers need to draw triangles or draw circles on a blackboard, the existing triangle drawing mode is that teachers draw lines one by one through triangles, and because each triangle is only in a fixed shape, such as a right-angled triangle, an equilateral triangle and an obtuse triangle, circle drawing needs the teachers to draw with compasses, and the compasses are very inconvenient in the drawing process.

The utility model has the following contents:

the utility model aims at providing a combination formula drawing ware for mathematical education.

The above purpose is realized by the following technical scheme:

a combined drawing device for mathematical education comprises a protractor, wherein a triangular opening is formed in the protractor, a tripod is placed in the triangular opening and is connected with the bottom of the tripod through a rotating shaft, supporting leg devices are fixed on the left side, the right side and the top of the protractor, and a strip-shaped hole is formed in the corresponding position of each supporting leg device;

the support leg device comprises vertical plates which are vertically arranged and fixed on two sides of the strip-shaped hole, the vertical plates are connected with the concave sliding plate in a sliding mode, and the sliding plate is provided with an upright column in a penetrating mode and is rotatably connected with the upright column.

The combined drawing device for mathematical education is characterized in that the vertical plate is triangular.

The combined drawing device for mathematical education is characterized in that a group of positioning holes which are uniformly distributed are respectively arranged on the left side and the right side of the protractor.

Has the advantages that:

1. the utility model discloses utilize the combination of protractor and tripod, can directly draw equilateral triangle, right triangle and obtuse triangle, do not need the drawing of teacher's a line, save the plotting time.

The utility model discloses set up the locating hole, through one of them stabilizer blade ware of sliding for the slide slides, and the pillar height is less than the protractor, then regards the stand as the centre of a circle, makes the chalk insert in the locating hole of difference, rotates the protractor and can directly make the circle, does not need the reuse compasses to make the circle.

The utility model discloses combine a plurality of set squares, protractor and compasses together, form a drawing ware, can realize multiple mapping demand.

Description of the drawings:

FIG. 1 is a front view of the present invention when not in use;

FIG. 2 is a schematic structural view of the tripod for drawing;

fig. 3 is a side view of the present invention;

FIG. 4 is a front view of the slide plate and the upright;

in the figure: 1. a protractor; 2. opening the gap; 3. a stand bar device; 4. a strut; 5. a rotating shaft; 6. a tripod; 7. positioning holes; 8. a strip-shaped hole; 9. a vertical plate; 10. a slide plate; 11. and (4) a column.

The specific implementation mode is as follows:

the utility model provides a combination formula drawing ware for mathematical education, this combination formula drawing ware for mathematical education includes protractor 1, the protractor on set up triangle-shaped opening 2, triangle-shaped opening inside put tripod 6 and with the bottom of tripod connect through pivot 5, the pivot is worn to establish the bottom of tripod and is fixed with the tripod, pivot both sides and the both sides rotatable coupling of opening for the pivot can rotate, the triangle-shaped opening of protractor is two right triangle-angled triangle that the angle is 45 degrees, the tripod is equilateral triangle, the tripod inside have branch 4, branch vertical arrangement, wherein one end bonds in the inside summit department of tripod, has the clearance between the other end and the inside base of tripod, the clearance width is 1.2cm, the chalk diameter of conventional usefulness all is 1cm, the setting in this clearance can supply the chalk to pass, the left side, the right side of protractor, The right side and the top are both fixed with a stand bar device 3, and the corresponding position of each stand bar device is provided with a strip-shaped hole 8;

the leg supporting device comprises vertical plates 9 which are vertically arranged on two sides of the strip-shaped hole, the vertical plates and the protractors are in a bonding mode, the vertical plates are connected with concave sliding plates 10 in a sliding mode, the sliding plates are matched with the vertical plates, each vertical plate is 7-shaped, the sliding plates are buckled on the two vertical plates and can slide on the vertical plates, and the sliding plates are provided with stand columns 11 in a penetrating mode and are connected with the stand columns in a rotating mode.

Example 2:

according to the combined drawing instrument for mathematical education described in embodiment 1, the vertical plate is triangular.

The inclination angle of the vertical plate is 30 degrees, the sliding plate can be slid upwards to enable the bottom of the upright post to be located above the protractor, and the sliding plate can be slid downwards to enable the bottom of the upright post to be located below the protractor to serve as a central point for drawing a circle.

Example 3:

according to the combined drawing instrument for mathematics teaching in embodiment 1 or 2, the left and right sides of the protractor are respectively provided with a group of positioning holes 7 which are uniformly arranged.

When the chalk is used and needs to draw a triangle, as shown in fig. 2, the triangular frame is rotated from the opening to be in the same plane with the protractor, then the chalk is used for drawing two right-angled triangles with acute angles of 45 degrees on the triangular opening along the edge of the triangular opening, the triangular frame is rotated back into the opening, the chalk is used for drawing an equilateral triangle along the edge of the triangular opening, the chalk is used for drawing two right-angled triangles with acute angles of 30 degrees and 60 degrees respectively along the edge of the left side of the triangular opening and the edge of the supporting rod, the chalk is used for drawing an obtuse triangle with an obtuse angle of 120 degrees along the left side edge of the triangular opening and the left side edge of the triangular frame, if a circle needs to be drawn, the sliding plate of the left side or right side stand bar device is slid, for example, the sliding plate of the left side stand bar device is slid downwards, so that the bottom height, then pressing the support with fingers to enable the bottom of the support to be pressed on a blackboard, enabling the diameter of the positioning hole to be 1.1cm, enabling a chalk to penetrate through the positioning hole, then selecting one positioning hole on the right side, pulling the chalk to enable the protractor to rotate, enabling the chalk to rotate a circle along the support to draw a circle, keeping the positions of the stand columns different, inserting the chalk into the different positioning holes to draw the circle with the same circle center and different diameters, and then drawing concentric circles.

Claims (3)

1. A combination formula drawing ware for mathematical education, characterized by: the combined drawing instrument for mathematical teaching comprises a protractor, wherein a triangular opening is formed in the protractor, a tripod is placed in the triangular opening and is connected with the bottom of the tripod through a rotating shaft, supporting leg instruments are fixed on the left side, the right side and the top of the protractor, and a strip-shaped hole is formed in the corresponding position of each supporting leg instrument;

the support leg device comprises vertical plates which are vertically arranged and fixed on two sides of the strip-shaped hole, the vertical plates are connected with the concave sliding plate in a sliding mode, and the sliding plate is provided with an upright column in a penetrating mode and is rotatably connected with the upright column.

2. The combined plotter for mathematical education of claim 1, characterized in that: the vertical plate is triangular.

3. The combined plotter for mathematical education of claim 2, characterized in that: the left side and the right side of the protractor are respectively provided with a group of positioning holes which are uniformly distributed.

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