CN211000661U

CN211000661U - Teaching compasses that chalk is difficult for fracture for junior middle school mathematics

Info

Publication number: CN211000661U
Application number: CN201921766622.XU
Authority: CN
Inventors: 李玲
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-10-21
Filing date: 2019-10-21
Publication date: 2020-07-14
Anticipated expiration: 2029-10-21

Abstract

The utility model discloses a teaching compasses that junior high school mathematics is difficult cracked with chalk relates to teaching aid technical field, this teaching compasses that junior high school mathematics is difficult cracked with chalk, including connecting piece and chalk cover, the bottom of connecting piece is equipped with the sucking disc subassembly, the top of connecting piece is seted up flutedly, the front and the back of recess inner wall respectively with the front and the back fixed connection of plectane, the inside of recess is equipped with the rotation piece, the circular slot has been seted up in the front of rotation piece, the inner wall of circular slot and the surface swing joint of plectane, first draw-in groove and second draw-in groove have been seted up respectively to the inner wall of circular slot. The utility model discloses a set up and rotate piece, scale, special-shaped disc, fixed plate and buffer spring, solved present junior middle school mathematics teaching compasses and need additionally be equipped with the ruler volume and get and then draw the circle of certain size on the blackboard to the cracked phenomenon of chalk appears easily when drawing, the problem of not being convenient for to use.

Description

Teaching compasses that chalk is difficult for fracture for junior middle school mathematics

Technical Field

The utility model relates to a teaching aid technical field specifically is a teaching compasses that junior middle school mathematics is difficult for fracture of chalk.

Background

In the teaching of junior high school mathematics, compasses are one of the most commonly used teaching aids, and the biggest difference with compasses for students lies in the size difference, and compasses for teaching are generally bigger, need to carry out the drawing on the blackboard for students to study.

Among the prior art, junior middle school mathematics teaching compasses are generally not furnished with the scale, if need draw the circle of certain size on the blackboard, need additionally be equipped with the ruler and get, use comparatively inconveniently to the cracked phenomenon of chalk appears easily when drawing, be not convenient for use.

SUMMERY OF THE UTILITY MODEL

Technical problem to be solved

The utility model provides a junior high school mathematics is with difficult cracked teaching compasses of chalk possesses the volume of being convenient for and the difficult cracked advantage of chalk to solve present junior high school mathematics teaching compasses and need additionally be equipped with the ruler volume and get and then draw the circle of certain size on the blackboard, and appear the cracked phenomenon of chalk easily when drawing, the problem of not being convenient for to use.

(II) technical scheme

For the realization is convenient for get and the difficult cracked purpose of chalk, the utility model provides a following technical scheme: a teaching compass with a chalk for junior middle school mathematics not prone to fracture comprises a connecting piece and a chalk sleeve, wherein a sucker component is arranged at the bottom of the connecting piece, a groove is formed in the top of the connecting piece, the front side and the back side of the inner wall of the groove are fixedly connected with the front side and the back side of a circular plate respectively, a rotating piece is arranged inside the groove, a circular groove is formed in the front side of the rotating piece, the inner wall of the circular groove is movably connected with the surface of the circular plate, a first clamping groove and a second clamping groove are formed in the inner wall of the circular groove respectively, the inside of the first clamping groove positioned above the circular groove is movably connected with the surface of a first rack, a cavity is formed in the connecting piece, a spring is fixedly connected to the back side of the inner wall of the cavity, the first rack is fixedly connected to one end of the spring, a gear is sleeved, and gear and second rack meshing, the second rack is located the gear under, the one end through connection spare that the plectane was kept away from to the second rack extends to the back of connecting piece, the right side fixed connection scale that rotates the piece, the sleeve pipe has been cup jointed in the surface activity of scale, sheathed tube top is equipped with the locking bolt, sheathed tube bottom fixedly connected with right-angle bar, the right-hand member fixedly connected with special-shaped disc of right-angle bar, the left side fixedly connected with circle cover of chalk cover, the inner wall of circle cover and the surface swing joint of special-shaped disc, the inner wall fixedly connected with fixed plate of circle cover, the equal fixedly connected with buffer spring of upper surface and the lower surface of fixed plate, buffer spring fixed connection is on the surface of special-shaped disc.

As a preferred technical scheme of the utility model, the sucking disc subassembly includes sucking disc body, disc, circle box, dome and installed part, installed part fixed connection is in the bottom of connecting piece, the inboard of installed part and the side surface fixed connection of circle box, the surface at the sucking disc body is cup jointed in the circle box activity, dome threaded connection is at the top of circle box, the top of sucking disc body and the bottom fixed connection of disc, the surface of disc links with the inner wall activity of circle box.

As an optimized technical scheme of the utility model, the top and the equal activity of bottom of disc are inlayed and are had the ball.

As a preferred technical scheme of the utility model, the spout has been seted up to the bottom of cavity inner wall, the lower fixed surface of second rack is connected with the slider, the surface of slider and the inner wall swing joint of spout.

As an optimal technical scheme of the utility model, the top threaded connection of chalk cover has the screw cap.

(III) advantageous effects

Compared with the prior art, the utility model provides a teaching compasses that junior middle school mathematics is difficult for fracture of chalk possesses following beneficial effect:

the teaching compass is characterized in that a rotating piece, a graduated scale, a special-shaped disc, a fixing plate and a buffer spring are arranged, a threaded cover is firstly screwed off, chalks are arranged in a chalk sleeve, the threaded cover is screwed down, a locking bolt is unscrewed to further adjust the distance between a sucker body and the chalks, the length of the distance is judged through the graduated scale, namely the radius of a circle, the locking bolt is screwed down after the adjustment is completed, the sucker body is sucked on a blackboard, so that the chalks do circular motion around the sucker body, the circle is conveniently drawn, a right-angle rod does circular motion around the center of the sucker body in the circle drawing process, the round sleeve, the chalk sleeve and the chalks can rotate along the surface of the special-shaped disc in the process, the buffer spring plays a buffer role, the round sleeve, the chalk sleeve and the right-angle rod are not rigidly connected through the two buffer springs, if a blocking role is met in the circle drawing process, thereby chalk cover and chalk rotate along the surface of special-shaped disc buffer action to the chalk, just be difficult for the fracture at drawing circle in-process chalk, reached the volume of being convenient for and got and the difficult cracked effect of chalk, solved present junior middle school mathematics teaching compasses and need additionally be equipped with the ruler volume and get and then draw out the circle of certain size on the blackboard to the cracked phenomenon of chalk appears easily when drawing, the problem of not convenient to use.

Drawings

Fig. 1 is a schematic structural view of the present invention;

fig. 2 is a partial enlarged view of the position of the connecting member in fig. 1 according to the present invention;

FIG. 3 is a partial enlarged view of the chalk sleeve of FIG. 1 according to the present invention;

fig. 4 is a left sectional view of the circular plate of fig. 2 according to the present invention;

fig. 5 is a left sectional view of the buffering spring in fig. 3 according to the present invention.

In the figure: 1. a connecting member; 2. a chalk sleeve; 3. a sucker component; 301. a suction cup body; 302. a disc; 303. a round box; 304. a dome; 305. a mounting member; 4. a groove; 5. a circular plate; 6. a rotating member; 7. a circular groove; 8. a first card slot; 9. a second card slot; 10. a first rack; 11. a cavity; 12. a spring; 13. a gear; 14. a second rack; 15. a graduated scale; 16. a sleeve; 17. locking the bolt; 18. a right-angle rod; 19. a special-shaped disc; 20. a round sleeve; 21. a fixing plate; 22. a buffer spring; 23. a ball bearing; 24. a chute; 25. a slider; 26. and (4) a threaded cap.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1-5, a teaching compass with a chalk difficult to break for mathematics in junior middle school includes a connecting piece 1 and a chalk sleeve 2, a sucker assembly 3 is arranged at the bottom of the connecting piece 1, a groove 4 is arranged at the top of the connecting piece 1, the front and back of the inner wall of the groove 4 are respectively fixedly connected with the front and back of a circular plate 5, a rotating piece 6 is arranged inside the groove 4, the rotating piece 6 can rotate along a circle of the surface of the circular plate 5, a circular groove 7 is arranged at the front of the rotating piece 6, the inner wall of the circular groove 7 is movably connected with the surface of the circular plate 5, a first clamping groove 8 and a second clamping groove 9 are respectively arranged at the inner wall of the circular groove 7, the inside of the first clamping groove 8 above is movably connected with the surface of a first rack 10, when the first rack 10 is inserted into the first clamping groove 8, the rotating piece 6 cannot rotate, so as to fix a graduated, the back of the inner wall of the cavity 11 is fixedly connected with a spring 12, a first rack 10 is fixedly connected at one end of the spring 12, a gear 13 is movably sleeved on the surface of a fixed shaft fixedly connected with the inner wall of the cavity 11, the gear 13 can rotate around the fixed shaft, the gear 13 is meshed with the first rack 10, the gear 13 is meshed with a second rack 14, the second rack 14 is positioned under the gear 13, one end, far away from the circular plate 5, of the second rack 14 penetrates through the connecting piece 1 and extends to the back of the connecting piece 1, the right side of the rotating piece 6 is fixedly connected with a graduated scale 15, the surface of the graduated scale 15 is movably sleeved with a sleeve 16, the top of the sleeve 16 is provided with a locking bolt 17, the sleeve 16 is fixed on the graduated scale 15 by the locking bolt 17, the bottom of the sleeve 16 is fixedly connected with a right-angle rod 18, the right end of the right-angle rod 18 is fixedly connected with a special-, the inner wall of the round sleeve 20 is movably connected with the surface of the special-shaped disc 19, the inner wall of the round sleeve 20 is fixedly connected with a fixing plate 21, the upper surface and the lower surface of the fixing plate 21 are fixedly connected with buffer springs 22, and the buffer springs 22 are fixedly connected on the surface of the special-shaped disc 19.

Specifically, sucking disc subassembly 3 includes sucking disc body 301, disc 302, circle box 303, dome 304 and installed part 305, installed part 305 fixed connection is in the bottom of connecting piece 1, the inboard of installed part 305 and the side surface fixed connection of circle box 303, the surface at sucking disc body 301 is cup jointed in the activity of circle box 303, dome 304 threaded connection is at the top of circle box 303, the top of sucking disc body 301 and the bottom fixed connection of disc 302, the surface of disc 302 and the inner wall activity of circle box 303 are even.

In this embodiment, the sucker body 301 is sucked on the blackboard, and is rotated by the cooperation of the disc 302 and the round box 303.

Specifically, the top and the bottom of the disc 302 are movably embedded with balls 23.

In this embodiment, the balls 23 are divided into two groups, a group of balls 23 located above is in rolling connection with the surface of the round cover 304, a group of balls 23 located below is in rolling connection with the bottom of the inner wall of the round box 303, friction is mainly reduced, and the connecting piece 1 and the like are more easily rotated.

Specifically, the bottom of the inner wall of the cavity 11 is provided with a sliding groove 24, the lower surface of the second rack 14 is fixedly connected with a sliding block 25, and the surface of the sliding block 25 is movably connected with the inner wall of the sliding groove 24.

In this embodiment, the second rack 14 slides along the inner wall of the sliding groove 24, and guides the second rack 14, so that the movement of the second rack is more stable.

Specifically, the top of the chalk housing 2 is threadedly connected with a threaded cap 26.

In the embodiment, the chalk can be fixed inside the chalk sleeve 2 by screwing the threaded cover 26, which is simple and convenient.

The utility model discloses a theory of operation and use flow: when the chalk holder is used, firstly, the threaded cover 26 is unscrewed, chalk is loaded into the chalk holder 2, the threaded cover 26 is screwed, the chalk is fixed in the chalk holder 2, the side surface of the chalk is in close contact with the inner wall of the chalk holder 2, the distance between the center of the sucking disc body 301 and the chalk is adjusted by unscrewing the locking bolt 17, the length of the distance is judged by the graduated scale 15 and is the radius of a circle, the locking bolt 17 is screwed after the adjustment is completed, the sucking disc body 301 is sucked on the blackboard during drawing, the sucking disc body 301 is sucked on the blackboard so as not to rotate, the round box 303 is movably sleeved on the sucking disc body 301, the connecting piece 1, the round box 303 and the mounting piece 305 can rotate around the round disc 302, then the chalk does circular motion around the sucking disc body 301, the circle is drawn, the right-angle rod 18 does circular motion around the center of the sucking disc body 301 during drawing the circle, and the round holder 20 is screwed in the, The chalk sleeve 2 and the chalk can rotate along the surface of the special-shaped disc 19, the buffer springs 22 play a buffer role, the round sleeve 20, the chalk sleeve 2 and the chalk are not rigidly connected with the right-angle rod 18 through the two buffer springs 22, if the chalk encounters an obstruction effect in the circle drawing process, the chalk sleeve 2 and the chalk rotate along the surface of the special-shaped disc 19 so as to play a buffer role on the chalk, the chalk is not easy to break in the circle drawing process, so that the effects of convenient measurement and difficult chalk breaking are achieved, after the chalk is used, the second rack 14 is pressed, so that the gear 13 rotates to drive the first rack 10 to move and the movement direction of the gear is opposite to that of the second rack 14, when the first rack 10 is separated from the first clamping groove 8, the graduated scale 15 is held to enable the graduated scale 15 and the rotating piece 6 to rotate anticlockwise around the surface of the circular plate 5, and when the rotating piece 6 does not, second draw-in groove 9 moves to the original position of first draw-in groove 8, loosens second rack 14, and spring 12 extension to drive first rack 10 and insert the inside of second draw-in groove 9, scale 15 just can not rotate round plectane 5, later unscrews locking bolt 17, takes off sleeve pipe 16 from scale 15, alright accomodate.

In summary, the teaching compass with the chalk difficult to break for junior high school mathematics solves the problems that the existing teaching compass for junior high school mathematics needs to be additionally provided with a ruler to measure and further draw a circle with a certain size on a blackboard, the phenomenon of chalk breakage easily occurs during drawing, and the teaching compass is inconvenient to use by arranging the rotating part 6, the graduated scale 15, the special-shaped disc 19, the fixing plate 21 and the buffer spring 22.

It should be noted that, in this document, terms such as "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides a teaching compasses that junior middle school mathematics is difficult for fracture with chalk, includes connecting piece (1) and chalk cover (2), its characterized in that: the sucker component (3) is arranged at the bottom of the connecting piece (1), the groove (4) is formed in the top of the connecting piece (1), the front surface and the back surface of the inner wall of the groove (4) are fixedly connected with the front surface and the back surface of the circular plate (5) respectively, the rotating piece (6) is arranged inside the groove (4), the circular groove (7) is formed in the front surface of the rotating piece (6), the inner wall of the circular groove (7) is movably connected with the surface of the circular plate (5), the inner wall of the circular groove (7) is respectively provided with a first clamping groove (8) and a second clamping groove (9), the inside of the first clamping groove (8) above the circular groove is movably connected with the surface of the first rack (10), the cavity (11) is formed inside the connecting piece (1), the spring (12) is fixedly connected with the back surface of the inner wall of the cavity (11), and the first rack (10) is fixedly connected with, the surface of a fixed shaft fixedly connected with the inner wall of the cavity (11) is movably sleeved with a gear (13), the gear (13) is meshed with a first rack (10), the gear (13) is meshed with a second rack (14), the second rack (14) is positioned under the gear (13), one end, far away from a circular plate (5), of the second rack (14 penetrates through the connecting piece (1) and extends to the back face of the connecting piece (1), the right side of the rotating piece (6) is fixedly connected with a graduated scale (15), the surface of the graduated scale (15) is movably sleeved with a sleeve (16), the top of the sleeve (16) is provided with a locking bolt (17), the bottom of the sleeve (16) is fixedly connected with a right-angle rod (18), the right end of the right-angle rod (18) is fixedly connected with a special-shaped disc (19), the left side of the right-angle chalk sleeve (2) is fixedly connected with a round sleeve (20), the inner wall of the round sleeve (20) is movably connected with the surface of the special-shaped disc (19), the inner wall of the round sleeve (20) is fixedly connected with a fixing plate (21), the upper surface and the lower surface of the fixing plate (21) are fixedly connected with buffer springs (22), and the buffer springs (22) are fixedly connected on the surface of the special-shaped disc (19).

2. The teaching compasses as claimed in claim 1, wherein the teaching compasses are not easy to break with chalk for junior high school mathematics, and characterized in that: sucking disc subassembly (3) are including sucking disc body (301), disc (302), circle box (303), dome (304) and installed part (305), installed part (305) fixed connection is in the bottom of connecting piece (1), the inboard of installed part (305) and the side surface fixed connection of circle box (303), the surface at sucking disc body (301) is cup jointed in the activity of circle box (303), dome (304) threaded connection is at the top of circle box (303), the top of sucking disc body (301) and the bottom fixed connection of disc (302), the surface of disc (302) links with the inner wall activity of circle box (303).

3. The teaching compasses not easy to break with the chalk for junior middle school mathematics according to claim 2, characterized in that: the top and the bottom of the disc (302) are movably embedded with balls (23).

4. The teaching compasses as claimed in claim 1, wherein the teaching compasses are not easy to break with chalk for junior high school mathematics, and characterized in that: the bottom of the inner wall of the cavity (11) is provided with a sliding groove (24), the lower surface of the second rack (14) is fixedly connected with a sliding block (25), and the surface of the sliding block (25) is movably connected with the inner wall of the sliding groove (24).

5. The teaching compasses as claimed in claim 1, wherein the teaching compasses are not easy to break with chalk for junior high school mathematics, and characterized in that: the top of the chalk sleeve (2) is in threaded connection with a threaded cover (26).