Protective compasses for primary school

Abstract

The utility model discloses a primary school protective compass, which relates to the technical field of learning tools and comprises a fixing frame, a supporting plate and a connecting plate are rotatably connected to the surface of a fixing shaft at the bottom end of the fixing frame, a positioning sharp block is fixedly connected to the bottom of the supporting plate, a universal ball seat is arranged at the bottom end of the positioning sharp block, and a universal ball is rotatably connected to the inner wall of the universal ball seat. The bottom end of the positioning sharp block penetrates through and is fixedly connected to the center of the universal ball, clamping columns are fixedly connected to the two sides of the universal ball seat, a fixing shell is arranged at the bottom of the supporting plate, the side faces of the universal ball seat and the clamping columns are movably inserted into the top of the inner wall of the fixing shell, and a fixing ring is fixedly connected to the side face, away from the supporting plate, of the connecting plate. The drawing pen solves the problems that when the needle point of the circle center is increased along with the angle of the drawing pen, the supporting force of the inclined needle point is weakened, in order to guarantee the completeness of a drawn circle, the drawing pen can draw the circle only by increasing the pressing force, and at the moment, the needle point easily penetrates through the paper surface, so that the completeness of the paper surface is damaged.

Description

TECHNICAL FIELD

[0001] The utility model relates to learning aid technical field, concretely is a primary school protection type compass. BACKGROUND

[0002] The compass is a kind of tool used to draw circle or arc in mathematics and drawing, to ensure the accuracy and standardization of figure, when learning the circumference and area of circle in primary school stage, can help student to understand and draw circle by using compass, to better understand the concept such as the circumference and area of circle.

[0003] When the diameter of common compass is large when drawing circle, the needle point used to determine the center of circle will be inclined with the increase of drawing pen angle, so that the supporting force of inclined needle point is weakened, in order to ensure the integrity of drawing circle, the pressing force needs to be increased, so that the drawing pen can complete the drawing of circle, at this time, the needle point is easy to pierce the paper surface, thereby damaging the integrity of paper surface, therefore, a primary school protection type compass is needed, which can not damage the paper surface even if the diameter of drawing circle is large. SUMMARY

[0004] The utility model aims at providing a primary school protection type compass to solve the problems in the above background.

[0005] In order to achieve the above purpose, the utility model provides the following technical scheme: a primary school protection type compass, including fixed frame, the surface of fixed frame bottom end fixed shaft is rotatably connected with support plate and connecting plate, the bottom of support plate is fixedly connected with positioning sharp block, the bottom of positioning sharp block is provided with universal ball seat, the inner wall of universal ball seat is rotatably connected with universal ball, the bottom of positioning sharp block is fixedly connected with the center of universal ball, the both sides of universal ball seat are fixedly connected with clamping column, the bottom of support plate is provided with fixed shell, the side surface of universal ball seat and clamping column is movably inserted in the top of fixed shell inner wall, the side of connecting plate away from support plate is fixedly connected with fixed ring, the inner wall of fixed ring is fixedly connected with automatic pencil.

[0006] Preferably, the bottom of support plate and the top of fixed shell are fixedly connected with magnetic attraction plate, and the two magnetic attraction plates are magnetically connected.

[0007] Preferably, one side of support plate is provided with fixed plate, one side of the top of fixed plate is fixedly connected with plug-in block, the side surface of plug-in block is movably inserted in one side of support plate, and the bottom of fixed plate is fixedly connected with bottom cover.

[0008] Preferably, one side of fixed plate is fixedly connected with connecting sheet, and one end of connecting sheet away from fixed plate is fixedly connected with cover plate.

[0009] Preferably, the top of the bottom cover is fixedly connected with a trapezoidal plug, and the side of the trapezoidal plug is slidably connected to the bottom of the fixed shell.

[0010] Preferably, one side of the support plate is fixedly connected with a sliding ruler, and the side of the connecting plate close to the support plate is slidably connected to the side of the sliding ruler.

[0011] Preferably, one end of the sliding ruler is fixedly connected with a baffle one, and the side of the support plate away from the sliding ruler is fixedly connected with a baffle two.

[0012] Preferably, the top of the fixed frame is fixedly connected with a rotating handle.

[0013] Compared with the prior art, the utility model has the advantages that:

[0014] The fixed shell can fix the universal ball seat through the fixed shell, and the positioning sharp block is inclined and rotated under the action of the universal ball body, so that the stability of drawing is greatly increased, the integrity of paper is ensured, and the safety of the device is improved when the positioning sharp block is not used. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is an overall structure schematic view of the utility model;

[0016] Figure 2 It is an overall structure split cross section schematic view of the utility model;

[0017] Figure 3 It is an overall structure split cross section schematic view of the utility model; Figure 2 It is an enlarged schematic view of the structure at A of the utility model;

[0018] Figure 4 It is an overall structure split cross section schematic view of the utility model;

[0019] Figure 5 It is an overall structure split cross section schematic view of the utility model;

[0020] In the drawing: 1, rotating handle; 2, fixed frame; 3, support plate; 4, baffle one; 5, sliding ruler; 6, connecting plate; 7, automatic pencil; 8, fixed ring; 9, fixed plate; 10, connecting piece; 11, cover plate; 12, positioning sharp block; 13, plug; 14, trapezoidal plug; 15, bottom cover; 16, magnetic plate; 17, universal ball body; 18, universal ball seat; 19, fixed shell; 20, clamping column; 21, baffle two. DETAILED DESCRIPTION

[0021] Clearly, the described embodiments are merely a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0022] Please refer to Figures 1-5 The utility model provides a technical scheme: A primary school protection compass, including fixed frame 2, the surface rotation of fixed frame 2 bottom end fixed axle is connected with support plate 3 and connecting plate 6, the bottom fixed connection of support plate 3 has location sharp block 12, the bottom of location sharp block 12 is provided with universal ball seat 18, the inner wall rotation of universal ball seat 18 is connected with universal ball 17, the bottom of location sharp block 12 is fixedly connected in the center of universal ball 17, the both sides of universal ball seat 18 are all fixedly connected with clamping column 20, the bottom of support plate 3 is provided with fixed shell 19, the side of universal ball seat 18 and clamping column 20 is movably inserted in the top of fixed shell 19 inner wall, through the fixed operation of fixed shell 19 to universal ball seat 18, greatly increased the stability of drawing, to ensure the integrity of paper, the side fixedly connected with fixed ring 8 of connecting plate 6 away from support plate 3, the inner wall fixedly connected with automatic pencil 7 of fixed ring 8.

[0023] Further, the bottom of support plate 3 and the top of fixed shell 19 are both fixedly connected with magnetic attraction plates 16, which facilitates the storage of fixed shell 19 when not in use, thereby not affecting the positioning operation of location sharp block 12, and the two magnetic attraction plates 16 are magnetically connected.

[0024] Further, one side of support plate 3 is provided with a fixed plate 9, one side of the top end of fixed plate 9 is fixedly connected with an insertion block 13, the side of insertion block 13 is movably inserted into one side of support plate 3, and the bottom of fixed plate 9 is fixedly connected with a bottom cover 15, which can hide the tip of location sharp block 12 inside fixed shell 19, thereby playing a protective role.

[0025] Further, one side of fixed plate 9 is fixedly connected with a connecting piece 10, one end of connecting piece 10 away from fixed plate 9 is fixedly connected with a cover plate 11, which not only reduces the possibility of support plate 3 and connecting plate 6 being spread out when not in use, but also protects the exposed pencil core at the bottom end of automatic pencil 7.

[0026] Further, the top of bottom cover 15 is fixedly connected with a trapezoidal insertion strip 14, since the trapezoidal insertion strip 14 is designed in a trapezoidal shape, even if the device is inverted, the bottom cover 15 still fits with fixed shell 19 when the trapezoidal insertion strip 14 is fixedly connected with fixed shell 19, and the side of trapezoidal insertion strip 14 is slidingly connected to the bottom of fixed shell 19. Further, the top of bottom cover 15 is fixedly connected with a trapezoidal insertion strip 14, since the trapezoidal insertion strip 14 is designed in a trapezoidal shape, even if the device is inverted, the bottom cover 15 still fits with fixed shell 19 when the trapezoidal insertion strip 14 is fixedly connected with fixed shell 19, and the side of trapezoidal insertion strip 14 is slidingly connected to the bottom of fixed shell 19.

[0027] Further, one side of the support plate 3 is fixedly connected with a sliding scale 5, which can more intuitively adjust the angle of rotation of the connecting plate 6, thereby facilitating drawing. The side of the connecting plate 6 close to the support plate 3 is slidingly connected to the side of the sliding scale 5.

[0028] Further, one end of the sliding scale 5 is fixedly connected with a baffle one 4, and the side of the support plate 3 away from the sliding scale 5 is fixedly connected with a baffle two 21, which prevents the connecting plate 6 from sliding out of the sliding scale 5.

[0029] Further, the top of the fixed frame 2 is fixedly connected with a handle 1, which facilitates students to rotate the device for drawing operation.

[0030] First, according to the values marked on the side of the sliding scale 5, the angle of rotation of the automatic pencil 7 is determined, and then the position of the center of the circle is determined by the bottom end of the positioning sharp block 12. When the position of the center of the circle is determined, it is determined whether to use the fixed shell 19 according to the angle of rotation. When the angle of rotation does not require additional pressing force on the positioning sharp block 12, the automatic pencil 7 and the positioning sharp block 12 can complete the circle drawing at this time. When the angle of rotation of the automatic pencil 7 is large, the supportability of the bottom end of the positioning sharp block 12 is weakened. In order not to damage the integrity of the paper, the fixed shell 19 is removed from the magnetic plate 16 at the bottom of the support plate 3 at this time, so that the inner wall of the fixed shell 19 clamps the universal ball seat 18 and the clamping column 20, thereby fixing the universal ball seat 18. Then, the device is rotated by the handle 1, and the circle is drawn under the action of the automatic pencil 7. During the inclined rotation of the device, the positioning sharp block 12 rotates in the universal ball seat 18 through the universal ball 17 at this time, thereby facilitating the device to draw a circle while not requiring additional force on the positioning sharp block 12 to improve its supportability, ensuring the integrity of the paper.

[0031] When the device is not in use, in order to prevent the positioning sharp block 12 from accidentally injuring the students, the bottom of the fixed shell 19 can be covered by sliding the bottom cover 15 through the insertion block 13 and the trapezoidal insertion strip 14, so that the tip of the positioning sharp block 12 is hidden inside the fixed shell 19, thereby playing a protective role. When the bottom cover 15 is attached to the bottom of the fixed shell 19, the inner side of the cover plate 11 is also attached to the side of the automatic pencil 7 at this time, thereby reducing the possibility of the support plate 3 and the connecting plate 6 being opened when not in use, and also protecting the exposed lead of the automatic pencil 7.

[0032] It is to be noted that, in the present document, relational terms such as first and second and the like can be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "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 can include other elements not expressly listed or inherent to such process, method, article, or apparatus.

[0033] While the embodiments of the present application have been illustrated and described, it will be understood by those skilled in the art that various changes, modifications, substitutions, and alterations can be made therein without departing from the spirit and scope of the application, which is defined by the appended claims and their equivalents.

Claims

1. A primary school protective compass comprising a fixing frame (2), characterized in that: The surface of the bottom end fixed shaft of the fixing frame (2) is rotationally connected with a supporting plate (3) and a connecting plate (6), the bottom of the supporting plate (3) is fixedly connected with a positioning sharp block (12), the bottom end of the positioning sharp block (12) is provided with a universal ball seat (18), the inner wall of the universal ball seat (18) is rotationally connected with a universal ball (17), the bottom end of the positioning sharp block (12) penetrates through and is fixedly connected with the center of the universal ball (17), the two sides of the universal ball seat (18) are fixedly connected with clamping columns (20), the bottom of the supporting plate (3) is provided with a fixed shell (19), the side surfaces of the universal ball seat (18) and the clamping columns (20) are movably inserted into the top of the inner wall of the fixed shell (19), the side of the connecting plate (6) away from the supporting plate (3) is fixedly connected with a fixed ring (8), and the inner wall of the fixed ring (8) is fixedly connected with an automatic pencil (7).

2. A primary protective compass according to claim 1, wherein: The bottom of the supporting plate (3) and the top of the fixed shell (19) are fixedly connected with magnetic attraction plates (16), and the two magnetic attraction plates (16) are magnetically connected.

3. A primary protective compass according to claim 1, wherein: One side of the supporting plate (3) is provided with a fixed plate (9), one side of the top end of the fixed plate (9) is fixedly connected with an insertion block (13), the side surface of the insertion block (13) is movably inserted into one side of the supporting plate (3), and the bottom of the fixed plate (9) is fixedly connected with a bottom plate cover (15).

4. A primary guard compass according to claim 3, wherein: One side of the fixed plate (9) is fixedly connected with a connecting piece (10), and one end of the connecting piece (10) away from the fixed plate (9) is fixedly connected with a cover plate (11).

5. A primary guard compass according to claim 4, wherein: The top of the bottom plate cover (15) is fixedly connected with a trapezoidal insertion strip (14), and the side surface of the trapezoidal insertion strip (14) is slidably connected to the bottom of the fixed shell (19).

6. A primary protective compass according to claim 1, wherein: One side of the supporting plate (3) is fixedly connected with a sliding scale (5), and the side of the connecting plate (6) close to the supporting plate (3) is slidably connected to the side of the sliding scale (5).

7. A primary guard compass according to claim 6, wherein: One end of the sliding scale (5) is fixedly connected with a baffle one (4), and the side of the supporting plate (3) away from the sliding scale (5) is fixedly connected with a baffle two (21).

8. A primary protective compass according to claim 1, wherein: The top of the fixing frame (2) is fixedly connected with a rotating handle (1).

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