Novel demonstrator

Abstract

The utility model relates to the technical field of score demonstrators, in particular to a novel demonstrator which comprises a shell. A first score disc is fixedly installed in the shell, a second score disc is installed on the right side of the first score disc, a first sliding groove is formed in the shell, the rear side of the lower end of the second score disc is inserted into the first sliding groove, and expansion assemblies are arranged on the shell, the first score disc and the second score disc. By rotating the second score disc, the second score disc drives the elastic cloth to stretch from the interior of the first score disc, and the limiting blocks in the sliding block are inserted into the five sets of limiting grooves respectively, so that the angle between the left side of the first score disc and the right end of the second score disc is adjusted; the first score disc and the second score disc are made to reach one-half, one-third, one-fourth, one-eighth and one-twelfth of a whole circle through the elastic cloth, and the convenience of using the shell, the first score disc and the second score disc is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of fraction demonstrators, in particular to a novel demonstrator. Background Art

[0002] The fraction demonstrator is a teaching tool that helps primary school students recognize and learn fractions. It contains five groups of "circles", which divide the circle into 2, 3, 4, 8, and 12 parts respectively. Each part represents 1 / 2, 1 / 3, 1 / 4, 1 / 8, and 1 / 12. Through the use of fraction disks, students can understand the relationship between part and whole, compare the size of fractions, and use fractions to perform simple addition and subtraction operations. The common fraction demonstrators on the market generally only have one circular groove and several fraction disks. The fraction disks are placed in the circular groove to demonstrate fractions. However, in class, teachers generally pick up the fraction disks for students to observe better. Since the internal clamping device of the circular groove is relatively simple, the fraction disks may fall off in the circular groove, which affects the teaching effect and wastes classroom teaching time. In addition, the fraction disks are divided into multiple parts, which makes it easy for the fraction disks to be lost after being used for a period of time. For this reason, we propose a new demonstrator to solve the above problems. Utility Model Content

[0003] The purpose of the utility model is to provide a new demonstrator to solve the problem mentioned in the above background technology that the common fraction demonstrator on the market generally consists of only one circular groove and several fraction disks, which leads to the possibility of the fraction disks being easily lost after being used for a period of time.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a new demonstrator, comprising a housing;

[0005] A first score disk is fixedly installed in the shell, a second score disk is installed on the right side of the first score disk, a first slide groove is opened in the shell, the rear side of the lower end of the second score disk is inserted into the first slide groove, and an expansion component is arranged on the shell, the first score disk and the second score disk.

[0006] Preferably, the extension component includes elastic cloth, which is arranged in the first score disk and the second score disk, a second slide groove is opened at the right end of the shell, a slider is arranged at the upper end of the second score disk, a movable groove is opened in the rear end of the slider, a spring is installed in the movable groove, a limit block is installed at the opening of the lower end of the movable groove, five groups of limit grooves are opened on the outer wall of the right end of the shell, and a pull rod is installed on the upper end of the limit block.

[0007] Preferably, the elastic cloth is made of spandex fiber material.

[0008] Preferably, the cross-section of the inner wall of the second slide groove and the lower end of the slider are both cross-shaped, and the inner wall of the second slide groove matches the lower end of the slider.

[0009] Preferably, the angles between the five groups of limiting grooves and the left side of the first fractional disk are respectively one-half, one-third, one-quarter, one-eighth and one-twelfth of the full circle.

[0010] Preferably, three groups of suction cups are arranged on the rear side of the shell.

[0011] Compared with the prior art, the utility model has the following beneficial effects: the utility model rotates the second score disk, and the second score disk drives the elastic cloth to stretch from the first score disk, and the limiting blocks in the slider are respectively inserted into the five groups of limiting grooves, so as to adjust the angle between the left side of the first score disk and the right end of the second score disk, so that the first score disk and the second score disk can reach one half, one third, one quarter, one eighth and one twelfth of the full circle through the elastic cloth, thereby improving the convenience of using the shell, the first score disk and the second score disk, and avoiding the loss of the first score disk and the second score disk during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0013] Figure 1 It is a schematic diagram of the structure of the utility model;

[0014] Figure 2 It is a schematic diagram of a front cross-section of the structure of the utility model;

[0015] Figure 3 It is a right side cross-sectional schematic diagram of the structure of the utility model;

[0016] Figure 4 For this utility model Figure 3 A is a partial enlarged schematic diagram of the middle part.

[0017] In the figure: 1, shell; 2, first score plate; 3, second score plate; 4, first slide groove; 5, elastic cloth; 6, second slide groove; 7, slider; 8, movable groove; 9, spring; 10, limit block; 11, limit groove; 12, pull rod; 13, suction cup. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0019] See also Figure 1-4 , the utility model provides an embodiment: a new demonstrator, including a shell 1;

[0020] A first score disk 2 is fixedly installed in the housing 1, a second score disk 3 is installed on the right side of the first score disk 2, a first slide groove 4 is provided in the housing 1, the rear side of the lower end of the second score disk 3 is inserted into the first slide groove 4, and an expansion component is provided on the housing 1, the first score disk 2 and the second score disk 3, and the structural expansion component expands the first score disk 2 and the second score disk 3, so that the first score disk 2 and the second score disk 3 can be used for teaching different specifications;

[0021] Furthermore, the expansion component includes an elastic cloth 5, which is arranged in the first score disk 2 and the second score disk 3. A second slide groove 6 is opened at the right end of the shell 1, and a slider 7 is arranged at the upper end of the second score disk 3. A movable groove 8 is opened in the rear end of the slider 7, and a spring 9 is installed in the movable groove 8. A limit block 10 is installed at the opening of the lower end of the movable groove 8. Five groups of limit grooves 11 are opened on the outer wall of the right end of the shell 1, and a pull rod 12 is installed on the upper end of the limit block 10. This structure drives the second score disk 3 to slide from the right side of the first score disk 2 by pulling the slider 7, and pulls the elastic cloth 5 out of the first score disk 2 and the second score disk 3 to unfold, so as to facilitate the expansion of the angle between the first score disk 2 and the second score disk 3.

[0022] Furthermore, the elastic cloth 5 is made of spandex fiber material. According to the material of the elastic cloth 5, the structure enables the elastic cloth 5 to be extended to four to six times of its original length, and the stretchability is excellent.

[0023] Furthermore, the cross-section of the inner wall of the second slide groove 6 and the lower end of the slider 7 are both cross-shaped, and the inner wall of the second slide groove 6 matches the lower end of the slider 7. According to the cross-section of the inner wall of the second slide groove 6 and the shape of the lower end of the slider 7, the structure will not detach from the second slide groove 6 when the slider 7 slides in the second slide groove 6.

[0024] Furthermore, the angles between the five groups of limit grooves 11 and the left side of the first score disk 2 are respectively one-half, one-third, one-quarter, one-eighth and one-twelfth of the full circle. According to the angles between the five groups of limit grooves 11 and the left side of the first score disk 2, the second score disk 3 and the first score disk 2 are respectively unfolded at angles of one-half, one-third, one-quarter, one-eighth and one-twelfth of the full circle.

[0025] Furthermore, three groups of suction cups 13 are provided at the rear side of the shell 1. This structure facilitates the shell 1 to be adsorbed on the blackboard through the three groups of suction cups 13, and the shell 1 does not need to be held by hand when in use.

[0026] Working principle: When using the housing 1, first attach the housing 1 to the blackboard through the suction cup 13. Figure 2 , Figure 3 and Figure 4 As shown, the limit block 10 is pulled out of the limit groove 11 by pulling the pull rod 12, and the limit block 10 is pulled out of the limit groove 11 and moves upward in the movable groove 8 to squeeze the spring 9, and then the slider 7 is pushed to slide in the second slide groove 6, and the slider 7 drives the second score disk 3 to rotate and open from the right end of the first score disk 2. When the second score disk 3 and the first score disk 2 are unfolded, the elastic cloth 5 is expanded. According to the unfolding angle of the first score disk 2 and the second score disk 3, the limit block 10 is respectively inserted into the five groups of limit grooves 11 under the action of the restorative elastic force of the spring 9, so that the unfolded shapes of the first score disk 2 and the second score disk 3 are respectively one-half, one-third, one-quarter, one-eighth and one-twelfth of the whole circle, which is convenient for teaching students. The above is the entire working principle of the utility model.

[0027] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

Claims

1. A novel demonstrator, comprising a housing (1); Features: A first score disk (2) is fixedly installed in the shell (1), a second score disk (3) is installed on the right side of the first score disk (2), a first slide groove (4) is opened in the shell (1), the rear side of the lower end of the second score disk (3) is inserted into the first slide groove (4), and an expansion component is arranged on the shell (1), the first score disk (2) and the second score disk (3).

2. A novel demonstrator according to claim 1, characterized in that: The expansion component comprises an elastic cloth (5), the elastic cloth (5) being arranged in the first score plate (2) and the second score plate (3), a second slide groove (6) being provided at the right end of the shell (1), a slider (7) being provided at the upper end of the second score plate (3), a movable groove (8) being provided at the rear end of the slider (7), a spring (9) being installed in the movable groove (8), a limit block (10) being installed at the opening of the lower end of the movable groove (8), five groups of limit grooves (11) being provided on the outer wall of the right end of the shell (1), and a pull rod (12) being installed at the upper end of the limit block (10).

3. A novel demonstrator according to claim 2, characterized in that: The elastic cloth (5) is made of spandex fiber material.

4. A novel demonstrator according to claim 2, characterized in that: The cross-section of the inner wall of the second slide groove (6) and the lower end of the slider (7) are both cross-shaped, and the inner wall of the second slide groove (6) matches the lower end of the slider (7).

5. A novel demonstrator according to claim 2, characterized in that: The angles between the five groups of limit grooves (11) and the left side of the first fractional disk (2) are respectively one-half, one-third, one-quarter, one-eighth and one-twelfth of the full circle.

6. A novel demonstrator according to claim 1, characterized in that: Three groups of suction cups (13) are arranged on the rear side of the housing (1).

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