CN219339073U

CN219339073U - Drawing auxiliary combination tool

Info

Publication number: CN219339073U
Application number: CN202320183577.5U
Authority: CN
Inventors: 孟垂霞
Original assignee: Wudi County Vocational Secondary Vocational School
Current assignee: Wudi County Vocational Secondary Vocational School
Priority date: 2023-02-10
Filing date: 2023-02-10
Publication date: 2023-07-14
Anticipated expiration: 2033-02-10

Abstract

The utility model provides an auxiliary drawing combination tool, which comprises a straight part and semicircular parts integrally connected with two ends of the straight part, wherein the surface of the straight part is provided with a central hole, the central hole and the semicircular parts are concentrically arranged, and an iron ring is fixed in the central hole; the surface of the semicircular part is provided with an arc groove concentric with the semicircular part and an angle scale mark close to the outer edge of the arc groove; the two ends of the back of the straight ruler are both provided with pivot shafts, wherein the pivot shaft at one end is provided with a second mounting hole, a second magnet is fixedly arranged in the second mounting hole, the end and the central hole form magnetic pivot, the pivot shaft at the other end is in sliding connection in the circular arc groove, the surface of the end is provided with a first indication line, and the first indication line is collinear with the outer edge of the straight ruler rail; the back of the straight ruler is provided with a first scale line close to one side edge. According to the utility model, the position and the posture of the half compass are not required to be changed in the drawing process, so that the operation is more convenient, and the fatigue caused by the arm suspension operation is reduced.

Description

Drawing auxiliary combination tool

Technical Field

The utility model belongs to the technical field of drawing teaching aids, and particularly relates to a drawing auxiliary combination tool.

Background

In the practice of science and education, drawing tools are commonly used to draw figures, such as straight lines, angles and the like in geometric teaching. It is therefore necessary to use a ruler and a protractor to complete the drawing of such figures.

When drawing the graph of the angle, the adopted tool is a protractor, when the traditional protractor is used for drawing the angle, one ray needs to be drawn firstly, then the center point of the protractor is aligned with the end point of the ray, the 0-degree score line is aligned with the ray, then the scale line of the corresponding angle is found, the mark point is drawn, and then the other ray is drawn from the end point of the ray after the end point of the ray and the mark point are aligned by the horizontal part of the protractor, so that the angle of the specific angle is obtained. It can be seen that this protractor requires two passes to be made to complete the drawing. Because it belongs to teaching aid, the size is great (diameter is about 50 cm), therefore there is some inconvenience in the operation, often uses and causes the arm ache easily.

Disclosure of Invention

The technical problems to be solved by the utility model are as follows: the drawing auxiliary combination tool is simple to operate, drawing and measuring of angles can be completed without the need of multiple times of fidbling the protractor body, and the drawing auxiliary combination tool is simple and easy to operate.

The utility model is realized in the following way: a drawing assistance combining tool comprising:

the semi-compass comprises a straight part and semi-circular parts integrally connected with two ends of the straight part, wherein the surface of the straight part is provided with a central hole, the central hole and the semi-circular parts are concentrically arranged, and an iron ring is fixed in the central hole; the surface of the semicircular part is provided with an arc groove concentric with the semicircular part and an angle scale mark close to the outer edge of the arc groove;

the two ends of the back of the straight ruler are respectively provided with a pivot shaft, the pivot shaft at one end is provided with a second mounting hole, a second magnet is fixedly arranged in the second mounting hole, the end and the central hole form magnetic pivot, the pivot shaft at the other end is in sliding connection in the circular arc groove, the surface of the end is provided with a first indication line, and the first indication line is collinear with the outer edge of the straight ruler; the back of the ruler is provided with a first scale line close to one side edge; when the ruler is at the 0-degree position, the inner edge of the ruler does not exceed the inner edge of the straight part; the outer edge of the ruler is collinear with the center of the pivot shaft.

Further, a plurality of first mounting holes are formed in the back face of the semicircular portion, and first magnets are fixed in the first mounting holes.

Further, the first mounting holes are distributed along the circular arc groove at equal angles; the pivot shaft connected with the arc groove is provided with a third mounting hole, and a third magnet is fixedly arranged in the third mounting hole.

Further, the surface of the straight part is also provided with observation holes symmetrically distributed at two sides of the central hole and a second indication line arranged at one side of the observation hole; the second indication line is collinear with the 0 degree line of the angle scale line; the central hole and the observation hole are through holes.

Further, the central hole is a stepped hole, and the height of the large-diameter section of the central hole is equal to that of the circular arc groove; the iron ring is fixed in the large-diameter section.

Further, the surface of the straight portion is also provided with a second scale line near the inner edge and a third scale line near the outer edge.

Further, the edge of the back surface of the straight ruler provided with the first scale mark is also provided with an inclined surface.

Compared with the prior art, the utility model has the beneficial effects that:

1. according to the utility model, the angle is determined by adopting the rotatable ruler, and the drawing of the second ray is completed, so that the drawing process does not need to change the position and the posture of the half compass, the operation is more convenient, and the fatigue caused by the arm suspension operation is reduced; furthermore, since the second ray is determined directly using a straight ruler, the angle determination is more accurate than by determining the point redrawn ray.

2. The straight ruler gauge and the half compass are detachably arranged, and can be combined for use when drawing angles and circular arcs, only the half compass can be used when measuring angles, and the straight ruler gauge and the half compass can be used when drawing straight lines, so that more choices are provided for users.

3. The straight ruler and the half compass are provided with the magnets, so that the straight ruler and the half compass can be fixed only by magnetic force when drawn on the magnetic blackboard, and the operation is easier.

Drawings

FIG. 1 is a perspective view of a preferred embodiment of the present utility model;

FIG. 2 is a front elevational view of the embodiment of FIG. 1;

FIG. 3 is a cross-sectional view taken along the direction A-A in FIG. 1;

FIG. 4 is a front view of the configuration of the half-compass of the embodiment of FIG. 1;

FIG. 5 is a rear view of the configuration of the half-compass of the embodiment of FIG. 1;

FIG. 6 is a rear view of the straight ruler of the embodiment of FIG. 1;

FIG. 7 is a schematic view of the embodiment of FIG. 1 depicting angles;

FIG. 8 is a schematic drawing illustrating angulation;

FIG. 9 is a schematic diagram of the embodiment of FIG. 1 depicting a circular arc;

FIG. 10 is a schematic illustration of unknown angles;

FIG. 11 is a schematic view of the embodiment of FIG. 1 for measuring angles;

fig. 12 is a schematic view of a third tick mark.

Detailed Description

The utility model is further described below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical aspects of the present utility model, and are not intended to limit the scope of the present utility model.

As shown in fig. 1 to 7, a drawing auxiliary combination tool includes a half compass 1 and a ruler compass 2.

The compass 1 comprises a straight part 101 and semicircular parts 102 integrally connected to two ends of the straight part 101, wherein a central hole 108 is formed in the surface of the straight part 101, the central hole 108 is concentric with the semicircular parts 102, and an iron ring 4 is fixed in the central hole 108. The surface of the semicircular portion 102 is provided with an arc groove 103 concentric therewith and an angle graduation line 107 near the outer edge thereof. The circular arc corresponding to the circular arc groove 103 is a major arc, that is, two ends of the circular arc groove extend to the surface of the straight ruler 2. The scale range of the angle scale line 107 is 0 to 180 degrees, the measurement accuracy is 1 degree, the 0 degree scale line is at the left end, the 180 degree scale line is at the right end, and the two scale lines are aligned with the circle center of the semicircular part 102.

In order to have the function of measuring angles, the surface of the straight portion 101 is further provided with observation holes 104 symmetrically distributed on both sides of the center hole 108 and second indication lines 105 provided on one side of the observation holes 104. The second indicator line 105 is collinear with the 0 ° scribe line of the angle tick mark. The central aperture 108 and the viewing aperture 104 are through holes.

In order to have the function of drawing a straight line, the surface of the straight portion 101 is further provided with a second graduation line 106 near the inner edge and a third graduation line 109 near the outer edge. The measurement accuracy of the second graduation mark 106 and the third graduation mark 109 is 1cm. The second scale line 106 has a measuring range of 40cm and the third scale line 109 has a measuring range of 60cm. As shown in fig. 12, the starting point score line of the second tick mark 106 is at the left end and the ending point score line is at the right end. The third scale line 109 has two sets of scale values, the first set of scale values having a starting point score at the right end and a finishing point at the left end, the second set of scale values having a starting point score in the middle and a finishing point at the right end.

In order to have the function of being attracted to the magnetic blackboard, a plurality of first mounting holes 110 are formed in the back surface of the semicircular portion 102, and the first magnets 5 are fixed in the first mounting holes 110.

The two ends of the back of the straight ruler 2 are provided with pivot shafts 205, and the pivot shafts 205 are eccentrically arranged, specifically, the outer edge 203 of the straight ruler 2 is collinear with the center of the pivot shafts 205. The pivot shaft 205 at one end is provided with a second mounting hole, the second mounting hole is fixedly provided with a second magnet 3, the end and the central hole 108 form magnetic pivot joint, the pivot shaft 205 at the other end forms sliding connection in the circular arc groove 103, the end surface is provided with a first indication line 202, and the first indication line 202 is collinear with the outer edge 203 of the straight ruler 2. The back of the straight ruler 2 is provided with a first graduation mark 204 near the inner edge.

When the straight ruler 2 is at the 0 degree position, the inner edge 201 of the straight ruler 2 does not exceed the inner edge of the straight portion 101. The straight ruler 2 and the half compass 1 are magnetically connected, so that the straight ruler 2 and the half compass 1 can be used independently or in combination. When the ruler 2 is in use, it needs to be flipped over with its back facing up to show the first scale line 204.

In order to enable the automatic positioning of the ruler 2 at a usual angle, the first mounting holes 110 are equiangularly distributed along the circular arc groove 103, the angle being set at 30 °. The pivot shaft connected with the arc groove 103 is provided with a third mounting hole, and a third magnet 6 is fixedly arranged in the third mounting hole. Thus, when drawing angles of 30 degrees, 60 degrees, 90 degrees, 120 degrees and 150 degrees, the ruler 2 can be automatically adsorbed to the position corresponding to the angle for quick drawing.

In the case that the pivot shafts are fixed with magnets, the pivot shaft 205 at either end can be inserted into the central hole 108 to complete the magnetic connection, so that the pivot shafts are required to extend to the same height perpendicular to the back surface of the ruler 2, the central hole 108 is required to be a stepped hole, and the height of the large-diameter section is equal to the height of the circular arc groove 103; the iron ring 4 is fixed in the large diameter section.

The inner edge 201 of the straight ruler 2 is also provided with a bevel for facilitating chalk drawing.

The half compass 1 and the ruler 2 can be manufactured in the following two ways:

1. the two are made into a main body structure by adopting a wood board through a CNC process or a laser cutting process, then scale lines and indication lines are printed through a printing process, and finally the rest parts are installed. The mode is suitable for small-batch production, especially for self-manufacture of users, and the size can be customized according to the use habit of the users.

2. The main structure is manufactured by adopting an injection molding process, then the scale marks and the indication lines are printed by adopting a printing process, and finally the rest parts are installed. The mode is suitable for mass production, especially for manufacturing by manufacturers.

The working principle and the process of the utility model are as follows:

1. and drawing an angle.

As shown in fig. 7, the half compass 1 and the ruler 2 are combined and placed on a blackboard, so that the half compass 1 is kept horizontal as much as possible, and the ruler 2 is positioned at a 0-degree dividing line. Then one hand presses the half compass 1, the other hand rotates the straight ruler 2 to a characteristic angle (for example, 60 degrees), and then the hand pressing the half compass 1 moves to the center hole of the half compass 1 to press the joint of the half compass 1 and the straight ruler 2, so that the two are fixed on a blackboard. The other hand held chalk 600 then draws two straight lines 100 along the inner edge of the straight portion 101 and the outer edge of the straight ruler 2, resulting in a drawing angle of 60 ° as shown in fig. 8.

2. And drawing an arc.

As shown in fig. 9, the half compass 1 and the straight ruler 2 are combined and then placed on a blackboard, then the half compass 1 is pressed by one hand, the other hand holds the chalk and presses the chalk at a specific position on the outer edge or the inner edge of the straight ruler 2, and then the straight ruler 2 is rotated to draw an arc. The arc 200 of the characteristic central angle can be obtained by controlling the starting point.

Before drawing the arc, the straight ruler 2 is adjusted to be parallel to the straight portion of the half compass 1, then a good position (i.e., the radius of the arc) is determined on the straight ruler 2 by using the third graduation mark 109, and then the straight ruler 2 is rotated to finish drawing.

3. The angle is measured.

As shown in fig. 11, in measuring the angle of the position angle formed by the horizontal line 300 and the inclined line 400 as shown in fig. 10, the half compass 1 is separately placed on the blackboard, and the included angle between the horizontal line 300 and the inclined line 400 is obtained by operating and observing the angle value corresponding to the angle scale line 107 of the inclined line 400 after the horizontal line 300 is aligned with the second indication line 105 by operating and observing such that the intersection point of the horizontal line 300 and the inclined line 400 (i.e., the vertex of the angle) is positioned and aligned in the center hole 108. If the inclined straight line is short and the angle scale line 107 cannot be aligned, the straight ruler 2 needs to be installed, the inclined straight line 400 is aligned by the outer edge 203 of the straight ruler 2, and then the scale pointed by the first indication line 202 is read.

It should be noted that, in the present utility model, the outer edge 203, the center of the circle and the first indication line 202 of the straight ruler 2 are collinear, so when the straight ruler 2 is required to be matched for angle measurement, the scale value indicated by the first indication line 202 is the angle value of the angle, if the outer edge 203 of the straight ruler 2 is not collinear with the first indication line 202, this will result in that after the first indication line 202 is aligned with the scale, the ruler body of the straight ruler 2 blocks the inclined straight line 400, and thus the angle measurement cannot be completed. If this problem is to be solved, the ruler 2 needs to be made of a transparent material, which increases the manufacturing cost. According to the utility model, the angle measurement can be completed by utilizing the characteristic that the outer edge 203, the center of the circle and the first indication line 202 are collinear without the material of the straight ruler 2, so that the cost is reduced, and the convenience is improved.

The foregoing is merely a preferred embodiment of the present utility model, and it should be noted that modifications and variations could be made by those skilled in the art without departing from the technical principles of the present utility model, and such modifications and variations should also be regarded as being within the scope of the utility model.

Claims

1. A drawing aid kit, comprising:

the pair of semi-compasses (1), wherein the semi-compasses (1) comprise a straight part (101) and semicircular parts (102) integrally connected with two ends of the straight part (101), a central hole (108) is formed in the surface of the straight part (101), the central hole (108) and the semicircular parts (102) are concentrically arranged, and an iron ring (4) is fixed in the central hole (108); the surface of the semicircular part (102) is provided with an arc groove (103) concentric with the semicircular part and an angle scale line (107) close to the outer edge of the arc groove;

the straight ruler (2) is characterized in that two ends of the back of the straight ruler (2) are provided with pivot shafts (205), the pivot shaft (205) at one end is provided with a second mounting hole, a second magnet (3) is fixedly arranged in the second mounting hole, the end and the central hole (108) form magnetic pivot, the pivot shaft (205) at the other end is in sliding connection in the circular arc groove (103), the surface of the end is provided with a first indication line (202), and the first indication line (202) is collinear with the outer edge (203) of the straight ruler (2); the back of the ruler (2) is provided with a first scale mark (204) close to one side edge; when the ruler (2) is at the 0-degree position, the inner edge (201) of the ruler does not exceed the inner edge of the straight part (101); the outer edge (203) of the ruler (2) is collinear with the center of the pivot shaft (205).

2. The drawing assisting combination tool according to claim 1, wherein a plurality of first mounting holes (110) are provided on the back surface of the semicircular portion (102), and first magnets (5) are fixed in the first mounting holes (110).

3. A drawing aid kit according to claim 2, wherein the first mounting holes (110) are equiangularly distributed along the circular arc groove (103); the pivot shaft connected with the arc groove (103) is provided with a third mounting hole, and a third magnet (6) is fixedly arranged in the third mounting hole.

4. The drawing aid combination tool according to claim 1, wherein the surface of the straight portion (101) is further provided with observation holes (104) symmetrically distributed on both sides of the center hole (108) and a second indication line (105) provided on one side of the observation holes (104); the second indicator line (105) is collinear with the 0 ° score line of the angle scale line; the central aperture (108) and the viewing aperture (104) are through-holes.

5. The drawing aid combination tool according to claim 4, wherein the center hole (108) is a stepped hole, and the height of the large diameter section is equal to the height of the circular arc groove (103); the iron ring (4) is fixed in the large-diameter section.

6. A drawing aid kit according to claim 1, wherein the surface of the straight portion (101) is further provided with a second graduation mark (106) near the inner edge and a third graduation mark (109) near the outer edge.

7. The drawing aid kit according to claim 1, wherein the edge of the ruler (2) provided with the first graduation mark (204) on the back is further provided with an inclined surface.