CN214727746U

CN214727746U - Teaching aid convenient for drawing circle

Info

Publication number: CN214727746U
Application number: CN202120927175.2U
Authority: CN
Inventors: 邹涛; 刘健; 姜博鑫
Original assignee: Zhijiang College of ZJUT
Current assignee: Zhijiang College of ZJUT
Priority date: 2021-04-30
Filing date: 2021-04-30
Publication date: 2021-11-16
Anticipated expiration: 2031-04-30

Abstract

The utility model discloses a teaching aid convenient for drawing circles, which comprises a main support shaft and a main ruler, wherein one end of the main ruler is rotatably arranged on the main support shaft, a lifting shaft mounting hole which is communicated up and down is axially arranged in the main support shaft, and a lifting shaft is arranged in the lifting shaft mounting hole; the relative upper part of the lifting shaft mounting hole is provided with internal threads, the relative upper part of the lifting shaft is provided with external threads, and the lifting shaft mounting hole are in threaded fit relative to the upper part and in clearance fit relative to the lower part; a magnet frame is arranged at the bottom of the lifting shaft, and a first magnet is arranged in the magnet frame; the rear side surface of the main ruler is provided with a chalk clip sliding groove along the length direction, and a chalk clip is slidably arranged in the chalk clip sliding groove. The utility model discloses a set up back shaft elevating system, the friction of ruler and blackboard when avoiding drawing the circle is light to be solved and is drawn the circle.

Description

Teaching aid convenient for drawing circle

Technical Field

The utility model relates to a teaching aid technical field, concretely relates to teaching aid convenient to draw circle.

Background

A draw circle teaching aid for teaching at present has the structure similar to the compasses, and its size has been compared in ordinary compasses and has been enlarged tens of times, but only can use as the compasses when using, need carry multiple teaching aids such as compasses, ruler, protractor when causing the teacher to impart knowledge to students, and these drawing instruments exist the size too big, defect such as the kind is too much, and inconvenient teacher hand-carries, and shared space is big, accomodates inconveniently. When teachers draw pictures in teaching, compasses, rulers, protractors and the like need to be frequently replaced, operation is inconvenient, and teaching speed is reduced.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a teaching aid convenient to draw a circle aims at solving the problem among the prior art that above-mentioned background art provided.

The above technical problem of the present invention can be solved by the following technical solutions: a teaching aid convenient for drawing circles comprises a main support shaft and a main scale, wherein one end of the main scale is rotatably arranged on the main support shaft, a lifting shaft mounting hole which is communicated up and down is formed in the main support shaft along the axial direction, and a lifting shaft is arranged in the lifting shaft mounting hole; the lifting shaft is in threaded fit with the upper part of the lifting shaft mounting hole, and is in clearance fit with the lower part of the lifting shaft mounting hole; a magnet frame is arranged at the bottom of the lifting shaft, and a first magnet is arranged in the magnet frame;

the chalk clip sliding groove is formed in the surface, along the length direction, of the rear side of the main ruler, and the chalk clip is slidably arranged in the chalk clip sliding groove.

Preferably, the chalk clamp comprises a chalk clamp body, a clamping screw and a sliding block, the sliding block is fixed on the chalk clamp body, and the sliding block is matched with the chalk clamp sliding groove; the chalk clamp body is of a two-ear opening type hoop structure, holes are formed in two ears of the chalk clamp body respectively, and the clamping screws penetrate through the holes in the two ears of the chalk clamp body to be fastened.

Preferably, the multifunctional ruler further comprises an auxiliary ruler, one end of the auxiliary ruler is rotatably arranged on the main supporting shaft, and the top of the auxiliary ruler is provided with reference circle scale marks around the main supporting shaft.

Preferably, the auxiliary scale is located above the main scale.

Preferably, an auxiliary support shaft capable of moving up and down is arranged at the free end of the auxiliary ruler in a penetrating mode, a second magnet is arranged at the bottom end of the auxiliary support shaft, and a limiting nut is arranged at the top end of the auxiliary support shaft.

Preferably, the upper surface of the main scale is provided with a counter bore corresponding to the second magnet.

Preferably, a third magnet is arranged in the counter bore.

Preferably, a strip-shaped groove is formed in the middle of the auxiliary ruler along the length direction; the main scale is provided with an alignment line, and when the auxiliary scale is superposed with the main scale, a 0-degree scale line of the auxiliary scale is superposed with the alignment line; the right end of the main ruler is provided with a V-shaped groove.

Compared with the prior art, the utility model, its beneficial effect lies in: the utility model has simple and small structure, avoids teachers carrying a plurality of teaching tools, reduces the time for teachers to frequently change tools for blackboard drawing, and reduces the difficulty for teachers to carry teaching tools to attend classes; through setting up back shaft elevating system, the friction of ruler and blackboard when avoiding drawing the circle is easily solved and is drawn the circle.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention.

Fig. 2 is an exploded schematic view of the present invention.

Fig. 3 is a schematic partial sectional view of the main support shaft of the present invention.

Fig. 4 is a rear schematic view of the present invention.

Fig. 5 is a schematic structural diagram of the present invention when drawing an angle.

In the figure: 1. a main scale; 2. a secondary ruler; 3. a main support shaft; 4. a secondary support shaft; 5. a second magnet; 6. a limit nut; 7. a counter bore; 8. a strip-shaped groove; 9. aligning the lines; 10. a V-shaped groove; 11. a first magnet; 12. a chalk clip sliding groove; 13. a chalk clip; 14. a chalk holder body; 15. a clamping screw; 16. a slider; 17. a lifting shaft; 18. a magnet frame.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further specifically described below by way of embodiments and with reference to the accompanying drawings.

Example (b): the utility model provides a teaching aid convenient to draw circle, as shown in fig. 1-5, includes main tributary supporting axle 3, main scale 1 and vice chi 2, wherein the one end of main scale 1 and vice chi 2 rotationally sets up respectively on main tributary supporting axle 3, and main scale 1 is down, and vice chi 2 is last, and the top of vice chi 2 is equipped with the round reference circle scale mark around main tributary supporting axle 3, and one side of main scale also is equipped with the scale.

In the above structure, in this embodiment, a chalk clip sliding groove 12 is formed in the rear side surface of the main scale 1, a chalk clip 13 is arranged in the chalk clip sliding groove 12, the chalk clip 13 includes a chalk clip body 14, a clamping screw 15 and a slider 16, the slider 16 is fixed on the chalk clip body 14, and the slider is H-shaped and matched with the chalk clip sliding groove 12; the chalk clamp body 14 is of a two-ear opening type hoop structure, holes are formed in two ears of the chalk clamp body 14 respectively, one hole is a threaded hole, the other hole is a unthreaded hole, the inner diameter of the threaded hole is smaller than the inner diameter of the unthreaded hole, an external thread matched with the threaded hole is arranged at the front end portion of the clamping screw 15, the clamping screw 15 penetrates through the unthreaded hole and then is connected with the threaded hole, a chalk can be clamped in the chalk clamp body 14, and the whole chalk clamp 13 can slide along the chalk clamp sliding groove 12.

In the embodiment, the main support shaft 3 is sequentially divided into an external thread section, an optical axis section and a base from top to bottom, and the end part of the main scale 1 is sleeved on the optical axis section and can freely rotate around the optical axis section; the end part of the auxiliary ruler 2 is matched with the thread of the external thread section; the bottom of the base is provided with a cavity. A lifting shaft mounting hole which is communicated up and down is axially formed in the main supporting shaft 3, and a lifting shaft 17 is arranged in the lifting shaft mounting hole; the relative upper part of the lifting shaft mounting hole is provided with internal threads, the relative upper part of the lifting shaft 17 is provided with external threads, the lifting shaft 17 is in threaded fit with the relative upper part of the lifting shaft mounting hole, and is in clearance fit with the relative lower part of the lifting shaft mounting hole; a magnet frame 18 is arranged at the bottom of the lifting shaft 17, and a first magnet 11 is arranged in the magnet frame 18; the top of the lifting shaft 17 penetrates through the top of the auxiliary ruler 2 and is formed with a knob.

In the above structure, the rotation knob can realize the up-and-down movement of the lifting shaft 17 through the internal thread of the mounting hole of the lifting shaft and the external thread of the lifting shaft 17, when the lifting shaft 17 is lifted to the limit position, the magnet frame 18 and the first magnet 11 are accommodated in the cavity at the bottom of the base of the main support shaft 3, and the bottom surface of the first magnet 11 is flush with the bottom surface of the main scale 1. When a circle needs to be drawn, a user holds the main support shaft 3, rotates the lifting shaft 17 to enable the lifting shaft to descend, further drives the magnet frame 18 to move downwards, then the first magnet 11 attracts the blackboard as a circle center, and at the moment, a gap exists between the bottom surface of the main ruler 1 and the blackboard to avoid friction between the bottom surface of the main ruler and the blackboard. After the circle drawing is finished, the lifting shaft 17 is rotated reversely to reset the circle drawing.

In the embodiment, the auxiliary ruler 2 is used for drawing angles, an auxiliary support shaft 4 capable of moving up and down is arranged at the free end of the auxiliary ruler in a penetrating mode, a second magnet 5 is arranged at the bottom end of the auxiliary support shaft 4, and a limiting nut 6 is arranged at the top end of the auxiliary support shaft; the upper surface of the main ruler 1 is provided with a counter bore 7 corresponding to the second magnet 5, and preferably, a third magnet is arranged in the counter bore 7. In addition, a strip-shaped groove 8 is formed in the middle of the auxiliary ruler 2 along the length direction, and the strip-shaped groove 8 corresponds to a 0-degree scale mark; the main ruler 1 is provided with an alignment line 9, and when the auxiliary ruler 2 is superposed with the main ruler 1, a 0-degree scale line of the auxiliary ruler 2 is superposed with the alignment line 9; the right end of the main scale 1 is provided with a V-shaped groove 10.

When drawing an angle, a user firstly draws a straight line on a blackboard by using a main ruler 1, the main ruler 1 rotates around the circumference of a main supporting shaft 3, the user aims at the straight line on the blackboard through a strip-shaped groove 8 at the top of an auxiliary ruler 2, then an auxiliary supporting shaft 4 is stretched downwards to enable a second magnet 5 to be in contact with the blackboard, when the main ruler 1 and the auxiliary ruler 2 form the required angle, a point is drawn at the top of a V-shaped groove 10 at the right end of the main ruler 1 by using chalk, then the auxiliary supporting shaft 4 is pulled upwards, the auxiliary ruler 2 is rotated to return to a zero position, the second magnet 5 at the bottom of the auxiliary supporting shaft 4 is embedded into a counter bore 7 at the top of the main ruler 1 and generates adsorption with a third magnet to avoid the detachment of the second magnet, and finally the drawn point is connected with one end point of the straight line by using the main ruler 1 to form the required angle.

Finally, it should be noted that the above embodiments are merely representative examples of the present invention. Obviously, the present invention is not limited to the above-described embodiments, and many modifications are possible. All changes and modifications that may be made by the technical spirit of the present invention to the above embodiments by simple modification are considered to fall within the scope of the present invention.

Claims

1. A teaching aid convenient for drawing circles is characterized by comprising a main support shaft and a main scale, wherein one end of the main scale is rotatably arranged on the main support shaft, a lifting shaft mounting hole which is communicated up and down is axially formed in the main support shaft, and a lifting shaft is arranged in the lifting shaft mounting hole; the lifting shaft is in threaded fit with the upper part of the lifting shaft mounting hole, and is in clearance fit with the lower part of the lifting shaft mounting hole; a magnet frame is arranged at the bottom of the lifting shaft, and a first magnet is arranged in the magnet frame;

2. The teaching aid convenient for drawing circles as claimed in claim 1, wherein the chalk clamp comprises a chalk clamp body, a clamping screw and a sliding block, the sliding block is fixed on the chalk clamp body, and the sliding block is matched with a chalk clamp sliding groove; the chalk clamp body is of a two-ear opening type hoop structure, holes are formed in two ears of the chalk clamp body respectively, and the clamping screws penetrate through the holes in the two ears of the chalk clamp body to be fastened.

3. A teaching aid as claimed in claim 1, further comprising a secondary scale, one end of the secondary scale being rotatably mounted on the primary support shaft, the top of the secondary scale being provided with reference circle graduations about the primary support shaft.

4. A teaching aid as claimed in claim 3, wherein the minor scale is located above the major scale.

5. The teaching aid convenient for drawing circles as claimed in claim 4, wherein an auxiliary support shaft capable of moving up and down is arranged at the free end of the auxiliary ruler in a penetrating mode, a second magnet is arranged at the bottom end of the auxiliary support shaft, and a limiting nut is arranged at the top end of the auxiliary support shaft.

6. A teaching aid convenient for drawing circles as claimed in claim 5, wherein the upper surface of the main scale is provided with a counter bore corresponding to the second magnet.

7. A teaching aid for facilitating circle drawing as claimed in claim 6, wherein a third magnet is provided in the counterbore.

8. A teaching aid convenient for drawing circles as claimed in claim 3, wherein a strip-shaped groove is formed in the middle of the auxiliary ruler along the length direction; the main scale is provided with an alignment line, and when the auxiliary scale is superposed with the main scale, a 0-degree scale line of the auxiliary scale is superposed with the alignment line; the right end of the main ruler is provided with a V-shaped groove.