CN215850486U

CN215850486U - Teaching compasses that blackboard writing was used for junior high school mathematics

Info

Publication number: CN215850486U
Application number: CN202121858308.1U
Authority: CN
Inventors: 陈�胜
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-08-10
Filing date: 2021-08-10
Publication date: 2022-02-18
Anticipated expiration: 2031-08-10

Abstract

The utility model discloses a teaching compass for blackboard writing for junior high school mathematics, which comprises a vertical rod, wherein a detachable sucker is arranged at the lower end of the vertical rod, a lower rotating ring is rotatably sleeved at the position, close to the lower end, of the vertical rod, the right side of the lower rotating ring is connected with a movable seat through a multi-section telescopic rod, a cylinder rod is hinged to the upper side of the movable seat, an upper rotating ring is rotatably sleeved on the outer wall of the top of the vertical rod, the right side of the upper rotating ring is hinged with a telescopic rod, the cylinder rod is slidably sleeved on the telescopic rod and is fixed on the telescopic rod through a handle screw, and a chalk fixing structure is arranged at the lower side of the movable seat. Compared with the prior art, the method has the advantages that: according to the teaching compass, the sucker is adsorbed on the blackboard, then the handle is held by one hand, and the movable seat is rotated by the other hand to draw a circle.

Description

Teaching compasses that blackboard writing was used for junior high school mathematics

Technical Field

The utility model relates to the technical field of teaching aids, in particular to a teaching compass for blackboard writing of junior high school mathematics.

Background

The teaching aid is one of tools commonly used by teachers in class, the types of the teaching aid are various, such as a ruler, a blackboard, multimedia and the like, wherein compasses are one of the tools commonly used by teachers in the middle school teaching process. However, the compasses in the prior art are not convenient enough when using, and teachers need to prick the fixed needle on the static compass foot on the blackboard when using the compasses, then rotate the compasses, and in this process, if not skilled enough to the use of compasses, then the position of the fixed needle is very easy to deviate when using, in case the deviation just needs redrawing, and the fixed needle can cause certain harm to the blackboard.

SUMMERY OF THE UTILITY MODEL

The teaching compass for blackboard writing of junior high school mathematics aims to overcome the technical difficulties and provide the teaching compass which is more convenient to use and cannot damage a blackboard.

In order to solve the technical problems, the technical scheme provided by the utility model is as follows: the utility model provides a teaching compasses that junior high school mathematics used blackboard writing, includes the pole setting, the pole setting lower extreme is equipped with the detachable sucking disc, and the pole setting is close to lower extreme department and rotates and has cup jointed down the swivel, the swivel right side is connected with the sliding seat through multisection telescopic link down, the hinge of sliding seat upside has the section of thick bamboo pole, it has cup jointed the swivel to rotate on the outer wall of pole setting top, it has the telescopic link to rotate the hinge on swivel right side, the section of thick bamboo pole slides and cup joints on the telescopic link and through the handle screw fixation on the telescopic link, the sliding seat downside is equipped with chalk fixed knot structure.

As an improvement, the front side of the telescopic rod is provided with scale marks.

As an improvement, a threaded connecting block is fixed at the upper end of the sucker, and a threaded hole matched with the threaded connecting block is formed in the lower end of the upright rod. And after the threaded connecting block is in threaded fit connection with the threaded hole, the sucker is fixed.

As an improvement, the chalk fixing structure comprises two arc-shaped clamping blocks and a locking ring, the two arc-shaped clamping blocks are distributed on the left side and the right side of the movable seat in a mirror image mode, a gap exists between the two arc-shaped clamping blocks, the gap is gradually increased from top to bottom, and the locking ring is sleeved on the outer walls of the two arc-shaped clamping blocks simultaneously.

As an improvement, a grab handle is fixed at the upper end of the vertical rod. The vertical rod is conveniently controlled to be fixed when the circle is drawn.

Compared with the prior art, the utility model has the advantages that: according to the teaching compass, the sucker is adsorbed on the blackboard, then the handle is held by one hand, and the movable seat is rotated by the other hand to draw a circle.

Drawings

FIG. 1 is a schematic structural view of a teaching compass for blackboard writing in junior high school mathematics.

FIG. 2 is an enlarged view of A of the teaching compass for blackboard writing in junior high school mathematics according to the present invention.

As shown in the figure: 1. erecting a rod; 2. a suction cup; 3. a lower swivel; 4. a multi-section telescopic rod; 5. a movable seat; 6. a barrel bar; 7. an upper swivel; 8. a telescopic rod; 9. a handle screw; 10. scale lines; 11. a threaded connection block; 12. a threaded hole; 13. an arc-shaped clamping block; 14. locking a ring; 15. a handle.

Detailed Description

In the description of the present invention, it is to be understood that the terms "center", "lateral", "upper", "lower", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified. Furthermore, the term "comprises" and any variations thereof is intended to cover non-exclusive inclusions.

The present invention will be described in further detail with reference to the accompanying drawings.

The utility model provides a teaching compasses that junior middle school mathematics used blackboard writing, includes

pole setting

1, 1 upper end in pole setting is fixed with

grab handle

15, and 1 lower extreme in pole setting is equipped with detachable sucking disc 2. Specifically, the upper end of the sucker 2 is fixed with a threaded connecting block 11, and the lower end of the upright rod 1 is provided with a threaded hole 12 matched with the threaded connecting block 11. After the sucker 2 is used for a long time, the adsorption force of the sucker can be reduced, and the sucker 2 can be conveniently replaced.

Upright pole 1 is close to lower extreme department and rotates and has cup jointed down swivel 3, 3 right sides of lower swivel are connected with sliding seat 5 through multisection telescopic link 4, and multisection telescopic link 4 among this technical scheme is prior art, 5 upside hinges of sliding seat have a section of thick bamboo pole 6, it has cup jointed swivel 7 to rotate on the outer wall of 1 top of upright pole, it has telescopic link 8 to go up 7 right sides hinges of swivel, section of thick bamboo pole 6 slides and cup joints on telescopic link 8 and fix on telescopic link 8 through handle screw 9. Wherein, the telescopic link 8 front side is equipped with scale mark 10, and the zero scale of scale mark 10 is in the upper end department of telescopic link 8.

When the movable seat 5 is used, the movable seat 5 can move horizontally, and when the horizontal position of the movable seat 5 changes, the radius of the drawn picture also changes. The radius of a drawn circle can be roughly calculated according to the scale on the telescopic rod 8 corresponding to the upper end of the cylinder rod 6, specifically, the scale number on the telescopic rod 8 corresponding to the upper end of the cylinder rod 6 is the length of the telescopic rod extending out of the cylinder rod 6 at the moment, then the length of the cylinder rod 6 is added by the scale number, and then the size of the drawn circle can be calculated according to the pythagorean theorem (wherein, it is worth noting that the size of the drawn circle can be roughly calculated in the mode as far as possible, and certain errors can exist). When the handle screw 9 is screwed to fix the telescopic rod 8, the position of the movable seat 5 relative to the upright 1 is also fixed. It is worth mentioning that the teaching compass in the technical scheme can not draw a circle with a too small radius, and the longer the maximum length of the multi-section telescopic rod 4 is within a certain range, the larger the radius of the circle which can be drawn by the teaching compass is.

And a chalk fixing structure is arranged on the lower side of the movable seat 5. Specifically, the chalk fixing structure comprises two arc-shaped clamping blocks 13 and a locking ring 14, the number of the arc-shaped clamping blocks 13 is two, the arc-shaped clamping blocks are distributed on the left side and the right side of the movable base 5 in a mirror image mode, a gap exists between the two arc-shaped clamping blocks 13, the gap is gradually increased from top to bottom, and the locking ring 14 is sleeved on the outer walls of the two arc-shaped clamping blocks 13 at the same time.

In use, chalk is placed between the two arc-shaped clamping blocks 13, the locking ring 14 is pulled downwards, and finally the chalk is fixed by means of friction between the locking ring and the outer walls of the arc-shaped clamping blocks 13 (the length of the chalk part at the lower side of the arc-shaped clamping blocks 13 is always fixed). Then the sucker 2 is adsorbed on the blackboard, then the handle 15 is held by one hand, the movable seat 5 is rotated by the other hand, and the movable seat 5 rotates around the upright rod 1 for a circle, so that the circle drawing is finished. After the use, all shrink as far as with multisection telescopic link 4 and telescopic link 8, and then alright make things convenient for depositing and carrying of teaching compasses.

The present invention and its embodiments have been described above, and the description is not intended to be limiting, and the drawings are only one embodiment of the present invention, and the actual structure is not limited thereto. In summary, those skilled in the art should appreciate that they can readily use the disclosed conception and specific embodiments as a basis for designing or modifying other structures for carrying out the same purposes of the present invention without departing from the spirit and scope of the utility model as defined by the appended claims.

Claims

1. The utility model provides a teaching compasses that blackboard writing was used for junior high school mathematics which characterized in that: including pole setting (1), pole setting (1) lower extreme is equipped with detachable sucking disc (2), and pole setting (1) are close to lower extreme department and rotate and have cup jointed down swivel (3), swivel (3) right side is connected with adjustable seat (5) through multisection telescopic link (4) down, adjustable seat (5) upside hinge has section of thick bamboo pole (6), swivel (7) have been cup jointed in rotating on pole setting (1) top outer wall, it has telescopic link (8) to go up swivel (7) right side hinge, section of thick bamboo pole (6) slide to cup joint on telescopic link (8) and fix on telescopic link (8) through handle screw (9), adjustable seat (5) downside is equipped with chalk fixed knot and constructs.

2. The teaching compass for blackboard writing of junior middle school mathematics, according to claim 1, is characterized in that: the front side of the telescopic rod (8) is provided with scale marks (10).

3. The teaching compass for blackboard writing of junior middle school mathematics, according to claim 1, is characterized in that: the sucker (2) is fixed with threaded connection block (11) at the upper end, and threaded hole (12) matched with threaded connection block (11) is opened at the lower end of upright rod (1).

4. The teaching compass for blackboard writing of junior middle school mathematics, according to claim 1, is characterized in that: the chalk fixing structure comprises two arc-shaped clamping blocks (13) and a locking ring (14), the number of the arc-shaped clamping blocks (13) is two, the arc-shaped clamping blocks are distributed on the left side and the right side of the movable base (5) in a mirror image mode, a gap exists between the two arc-shaped clamping blocks (13), the gap is gradually enlarged from top to bottom, and the locking ring (14) is simultaneously sleeved on the outer walls of the two arc-shaped clamping blocks (13).

5. The teaching compass for blackboard writing of junior middle school mathematics, according to claim 1, is characterized in that: a grab handle (15) is fixed at the upper end of the upright rod (1).