Telescopic demonstration device for teaching

Abstract

The utility model discloses a telescopic demonstration device for teaching, which belongs to the field of teaching auxiliary appliances and comprises a carrier, a first drawing board and a second drawing board, the first drawing board and the second drawing board are both longitudinally mounted on the carrier, the first drawing board is slidably connected in a guide groove on the carrier to move between a first position and a second position, and the second drawing board is slidably connected in a guide groove on the carrier. The second drawing board is fixedly mounted on the carrying frame; at the first position, the first drawing board is positioned on the front side of the second drawing board and at least partially shields the second drawing board; at the second position, the first drawing board is located over the second drawing board and abuts against the upper end of the second drawing board, and the first drawing board and the second drawing board are located on the same vertical plane; when the two panels are unfolded for use, the dislocation feeling cannot be generated, the overall appearance is smoother and more concise, the visual sense is better, and due to the fact that the whole panel is a plane, during writing, the hand feeling is more stable and not prone to being influenced by a staggered layer structure, and the writing experience is smoother.

Description

Technical Field

[0001] The utility model belongs to the field of teaching and training auxiliary tools, and in particular relates to a retractable demonstration device for teaching. Background Art

[0002] In some current education and training industries, lectures are generally conducted in combination with electronic screens and movable writing boards. However, the temporary writing boards that are easy to store are generally single-sided boards. Compared with foldable or stretchable multi-panels, the writing range of such single-sided boards is limited and can only provide writing space on one side. When more content needs to be displayed at the same time or different content partitions need to be made, the space is relatively cramped and not as flexible as multi-panels. Moreover, when it is necessary to switch between different writing topics or content, the single-panel board needs to be erased and rewritten, and it cannot be switched directly between different panels like multi-panels, which may affect efficiency and continuity.

[0003] Compared with the folding multi-panel, the stretchable multi-panel is faster and easier to unfold: it does not require complicated folding operations, can be put into use more quickly, and does not require a larger operating space during the unfolding process; however, when the existing stretchable multi-panel is unfolded and used, adjacent panels are often misaligned, which affects the writing fluency, causes visual differences at the misaligned locations, and is prone to dust accumulation.

[0004] Therefore, it is necessary to provide a retractable demonstration device for teaching to solve the above-mentioned defects. Utility Model Content

[0005] The embodiment of the utility model provides a retractable demonstration device for teaching, so as to solve the problems in the prior art.

[0006] The embodiment of the utility model adopts the following technical scheme: a retractable demonstration device for teaching, including a carrier, a first drawing board and a second drawing board, the first drawing board and the second drawing board are both longitudinally installed on the carrier, the first drawing board is slidably connected to the guide groove on the carrier to realize its movement between the first position and the second position, and the second drawing board is fixedly installed on the carrier; when in the first position, the first drawing board is located in front of the second drawing board and at least partially blocks the second drawing board; when in the second position, the first drawing board is located directly above the second drawing board and against the upper end of the second drawing board, and the first drawing board and the second drawing board are in the same vertical plane.

[0007] Preferably, the carrier includes a base and a supporting portion, the supporting portion includes two oppositely arranged side rods and a supporting plate connected between the two side rods, the second drawing board is fixedly connected to the supporting portion and is located between the two side rods, the guide grooves are configured into two groups and are symmetrically arranged on opposite sides of the two side rods; at least two groups of spaced rollers are installed on both sides of the first drawing board close to the two side rods, and the rollers are rollingly connected to the guide grooves on the corresponding sides, and the diameter of the rollers is adapted to the width of the corresponding guide grooves.

[0008] Preferably, the guide groove includes a first groove body extending upward along the length direction of the side rod, a second groove body staggered with the first groove body and consistent with the length direction of the first groove body, and a third groove body connected to the second groove body by an inclined transition from the top of the first groove body; when the first drawing board is in the first position, the lowest roller abuts against the bottom of the first groove body, and when the first drawing board is in the second position, the lowest roller abuts against the bottom of the second groove body.

[0009] Preferably, the portion where the third trough body is connected to the second trough body is higher than the bottom position height of the second trough body.

[0010] Preferably, the base includes a bottom plate, a cross plate and at least one set of telescopic rods; the telescopic rods are longitudinally mounted on the bottom plate, the cross plate is mounted on the top of the telescopic rods, and the support portion is connected to the cross plate.

[0011] Preferably, the telescopic rod includes a sleeve rod, a main rod and a first latch, the main rod is slidably connected to a slide groove on the sleeve rod, the main rod is provided with a first through hole extending laterally, and the sleeve rod is provided with a plurality of second through holes equidistantly distributed along its length direction, and the first latch is inserted into the first through hole and any one of the second through holes to realize the length adjustment of the telescopic rod.

[0012] Preferably, a rotating shaft is provided at the center of the support plate, and the rotating shaft is rotatably connected to the rotating hole on the horizontal plate. The horizontal plate is also fixedly mounted with an annular protrusion coaxial with the rotating hole, and the annular protrusion is surrounded by a plurality of first positioning holes that penetrate its body, and the rotating shaft is surrounded by a plurality of second positioning holes that penetrate its body, and a second pin is inserted into one of the first positioning hole and the second positioning hole to limit the rotating shaft.

[0013] Preferably, the outer end of one of the side rods is provided with a first socket that transversely passes through its body and is located at the second groove body, and the first drawing board is formed with a second socket corresponding to the first socket on the side close to the side rod; when the first drawing board is in the second position, the first socket is opposite to the second socket, and the first drawing board is limited by inserting a third pin in the first socket and the second socket.

[0014] Preferably, a plurality of casters are also installed at the lower end of the base plate.

[0015] At least one of the above technical solutions adopted in the embodiment of the utility model can achieve the following beneficial effects:

[0016] When the double-sided boards of the teaching retractable demonstration device of the utility model are unfolded for use, the first drawing board and the second drawing board are in the same vertical plane, and no sense of misalignment is generated. Compared with the existing stretchable writing board or foldable writing board, the overall appearance is flatter and simpler, and the visual sense is better. Moreover, since the entire board surface is a plane, the hand feels smoother when writing, is not easily affected by the staggered structure, and the writing experience is smoother. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0018] Figure 1 The three-dimensional structure of the first drawing board of the utility model when it is in the first position Figure 1 ;

[0019] Figure 2 The three-dimensional structure of the first drawing board of the utility model when it is in the first position Figure 2 ;

[0020] Figure 3 It is a three-dimensional structural cross-sectional view of the utility model when the first drawing board is in the first position;

[0021] Figure 4 It is an exploded view of the support part and the first drawing board of the utility model;

[0022] Figure 5 It is an exploded view of the side rod and the third latch of the utility model;

[0023] Figure 6 It is a schematic diagram of the three-dimensional structure of the utility model when the first drawing board is in the second position;

[0024] Figure 7 It is a three-dimensional structural cross-sectional view of the utility model when the first drawing board is in the second position;

[0025] Figure 8 It is an exploded view of the local structure in the base of the utility model.

[0026] Reference numerals

[0027] 1-carrier; 11-guide groove; 111-first groove body; 112-second groove body; 113-third groove body; 12-annular protrusion; 121-first positioning hole; 13-second latch; 14-third latch; 2-base; 21-bottom plate; 22-cross plate; 221-rotation hole; 23-telescopic rod; 24-sleeve rod; 241-slide groove; 242-second through hole; 25-main rod; 251-first through hole; 26-first latch; 27-castor; 3-support part; 31-side rod; 311-first plug hole; 32-support plate; 33-rotating shaft; 331-second positioning hole; 4-first drawing board; 41-roller; 42-second plug hole; 43-armrest; 5-second drawing board; 6-pen case. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model will be clearly and completely described below in combination with the specific embodiments of the utility model and the corresponding drawings. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of 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.

[0029] The technical solutions provided by various embodiments of the present invention are described in detail below in conjunction with the accompanying drawings.

[0030] Reference Figures 1 to 8 As shown, an embodiment of the utility model provides a retractable demonstration device for teaching, including a carrier 1, a first drawing board 4 and a second drawing board 5. The first drawing board 4 and the second drawing board 5 are suitable for boards for writing or painting, and can refer to boards for writing with markers or teaching boards such as those using chalk for writing in the prior art; the first drawing board 4 and the second drawing board 5 are both longitudinally mounted on the carrier 1, and the first drawing board 4 is slidably connected to a guide groove 11 on the carrier 1 to enable it to move between a first position and a second position, and the second drawing board 5 is fixedly mounted on the carrier 1.

[0031] In this embodiment, when in the first position (such as Figures 1 to 3As shown in the figure, the first drawing board 4 is located in front of the second drawing board 5 and at least partially blocks the second drawing board 5. This position is adapted to the position of the first drawing board 4 during normal use, and is used for writing in a small range. It will not occupy too much space and will not be limited by space. However, this single-panel writing method is suitable for use when the writing area is limited. It has at least the following defects: it can only provide a writing space on one side. When it is necessary to display more content at the same time or to partition different content, the space is relatively cramped and not as flexible as a multi-panel. The conversion is inconvenient: if it is necessary to switch to different writing themes or contents, the single-panel needs to be erased and rewritten, and it cannot be directly switched between different panels like a multi-panel, which may affect efficiency and continuity. The information display is not rich: it is impossible to present a variety of related or comparative information at the same time like a multi-panel, which is not conducive to the presentation and comparative display of complex information.

[0032] In the second position (such as Figure 6 and Figure 7 As shown in the figure, the first drawing board 4 is located directly above the second drawing board 5 and against the upper end of the second drawing board 5. The first drawing board 4 and the second drawing board 5 are in the same vertical plane. In this position, it is a double-sided board. Compared with the above-mentioned single-sided board usage scenario, it has the following advantages: double writing space, providing more writable areas, which can meet the needs of recording more information at the same time without frequent erasing; flexible switching, you can write on one side while retaining the original content on the other side, which is convenient for switching to display different information or ideas at any time without completely erasing and starting over, which is more convenient for teaching; classified display, different types of content can be written on both sides respectively, achieving clearer classification and comparative display, which helps to improve the effect of information communication; improve efficiency, reduce the time wasted due to waiting for erasing and rewriting, especially in scenarios such as continuous explanation, teaching, and discussion; multi-functional application, such as one side is used for writing text and the other side is used for drawing charts, etc., which increases the diversity and convenience of use.

[0033] In summary, when the double-sided board of the retractable demonstration device for teaching is in use, the first drawing board 4 and the second drawing board 5 are in the same vertical plane, and there will be no sense of misalignment. Compared with the existing stretched writing board or folding writing board, the overall appearance is flatter, simpler, and has a better visual sense. Moreover, since the entire board surface is a plane, the hand feels smoother when writing, is not easily affected by the staggered structure, and the writing experience is smoother.

[0034] Specifically, Figures 2 to 4As shown, the carrier 1 includes a base 2 and a support portion 3, the support portion 3 includes two oppositely arranged side rods 31 and a support plate 32 connected between the two side rods 31, the second drawing board 5 is fixedly connected to the support portion 3 and is located between the two side rods 31, and the guide grooves 11 are configured into two groups and are symmetrically arranged on opposite sides of the two side rods 31; the first drawing board 4 is respectively close to the two sides of the two side rods 31 and is installed with at least two groups of spaced rollers 41, and the rollers 41 are rollingly connected to the guide grooves 11 on the corresponding sides, and the diameter of the rollers 41 is adapted to the width of the corresponding guide grooves 11.

[0035] Specifically, Figure 4 and Figure 5 As shown, the guide groove 11 includes a first groove body 111 extending upward along the length direction of the side rod 31, a second groove body 112 staggered with the first groove body 111 and consistent with the length direction of the first groove body 111, and a third groove body 113 connected to the second groove body 112 by an inclined transition from the top of the first groove body 111;

[0036] On this basis, the movement of the first drawing board 4 has multiple states. When the first drawing board 4 is in the first position, the lowest roller 41 abuts against the bottom of the first slot 111, and the first drawing board 4 and the second drawing board 5 are arranged in parallel and partially or completely cover the second drawing board 5; when the first drawing board 4 is in the second position, the lowest roller 41 abuts against the bottom of the second slot 112, and the first drawing board 4 is located on the top of the second drawing board 5 and is in the same vertical plane. This position is a double-sided board usage state; and in the process of the first drawing board 4 moving from the first position to the second position, the upper roller 41 will first move into the third slot 113 and then move into the second slot 112. During this process, the entire first drawing board 4 is in a slightly tilted state, and when the lowest roller 41 also passes through the third slot 113 and moves into the second slot 112, the first drawing board 4 and the second drawing board 5 are in the same vertical plane.

[0037] On the basis of the above, in order to prevent the first drawing board 4 from sliding down the third groove 113 and falling into the first groove 111 in the second groove 112 due to gravity, the height of the portion where the third groove 113 is connected to the second groove 112 is set to be higher than the bottom position height of the second groove 112, so that after the roller 41 on the first drawing board 4 is completely moved into the second groove 112, that is, just out of the third groove 113, the first drawing board 4 can slide down due to gravity and make the lowest roller 41 abut against the bottom of the second groove 112. At the same time, the first drawing board 4 also abuts against the second drawing board 5, and the lower end of the second slide groove 241 can be used to limit the first drawing board 4;

[0038] When it is necessary to reset the first drawing board 4 from the second position to the first position, the user needs to lightly lift or slide up the first drawing board 4 so that the bottom roller 41 of the first drawing board 4 moves up to the end of the third groove 113, and then slightly pull the first drawing board 4 outward to move the roller 41 into the third groove 113. In this way, the first drawing board 4 can be reset. It should be noted that armrests 43 can also be provided on both sides of the lower end of the first drawing board 4 to facilitate the user to push or slide the first drawing board 4.

[0039] In some practical applications:

[0040] like Figure 2 and Figure 8 As shown, the base 2 is configured to include a bottom plate 21, a cross plate 22 and at least one set of telescopic rods 23; the telescopic rods 23 are longitudinally installed on the bottom plate 21, the cross plate 22 is installed on the top of the telescopic rods 23, and the support part 3 is connected to the cross plate 22.

[0041] Specifically, the telescopic rod 23 includes a sleeve rod 24, a main rod 25 and a first latch 26. The main rod 25 is slidably connected to a slide groove 241 on the sleeve rod 24. The main rod 25 is provided with a first through hole 251 extending transversely. The sleeve rod 24 is provided with a plurality of second through holes 242 distributed equidistantly along its length direction. The first latch 26 is inserted into the first through hole 251 and any one of the second through holes 242 to adjust the length of the telescopic rod 23.

[0042] In this embodiment, the height of the first drawing board 4 and the second drawing board 5 can be adjusted by setting the telescopic rod 23. This is mainly to deal with the situation where the first drawing board 4 and the second drawing board 5 are fully unfolded, that is, when the double-sided board is used, the height of the first drawing board 4 may be too high, which is not convenient for users to write, draw and other operations. Therefore, when unfolding the first drawing board 4, the position of the first drawing board 4 and the second drawing board 5 can be changed according to the user's own needs by adjusting the height of the telescopic rod 23, which is convenient for the user to use. The appropriate height of the first drawing board 4 and the second drawing board 5 is also convenient for trainees to watch.

[0043] A plurality of casters 27 are also mounted on the lower end of the base plate 21 to facilitate the movement or transportation of the entire device.

[0044] In some practical applications:

[0045] like Figure 1 , Figure 3 and Figure 6As shown, a rotating shaft 33 is provided at the center of the support plate 32, and the rotating shaft 33 is rotatably connected to the rotating hole 221 on the horizontal plate 22. An annular protrusion 12 coaxial with the rotating hole 221 is also fixedly mounted on the horizontal plate 22, and a plurality of first positioning holes 121 penetrating through the main body of the annular protrusion 12 are arranged around the annular protrusion 12, and a plurality of second positioning holes 331 penetrating through the main body of the annular protrusion 12 are arranged around the rotating shaft 33, wherein a second latch 13 is inserted into one of the first positioning hole 121 and the second positioning hole 331 to limit the rotating shaft 33.

[0046] In this embodiment, when the second latch 13 is removed, the angles of the first drawing board 4 and the second drawing board 5 can be adjusted. The first drawing board 4 and the second drawing board 5 shown in the figure are in a vertically unfolded state when unfolded, which is suitable for scenarios of vertical writing or drawing. By changing the angles of the first drawing board 4 and the second drawing board 5 so that the first drawing board 4 and the second drawing board 5 are in a horizontal state, that is, rotated ninety degrees, it can be suitable for scenarios of horizontal writing or drawing, thereby improving the adaptability of the retractable presentation device to various usage scenarios.

[0047] Specifically, a first socket 311 is provided at the outer end of one of the side rods 31, which passes through the body of the side rod 31 transversely and is located at the second slot 112. A second socket 42 corresponding to the first socket 311 is formed on the side of the first drawing board 4 close to the side rod 31. When the first drawing board 4 is in the second position, the first socket 311 is opposite to the second socket 42, and the first drawing board 4 is limited by inserting a third pin 14 into the first socket 311 and the second socket 42. When the first drawing board 4 and the second drawing board 5 are used for horizontal writing, in order to prevent the roller 41 on the first drawing board 4 from sliding in the second slot 112, causing the first drawing board 4 to shake and affect writing, the first drawing board 4 is limited by the third pin 14 to cope with this situation and ensure the stability of the first drawing board 4.

[0048] In addition, on the basis of the above, a pen box 6 can be installed on the telescopic frame to store tools for writing such as markers and chalks.

[0049] The above description is only an embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present invention shall be included in the scope of the claims of the present invention.

Claims

1. A retractable demonstration device for teaching, characterized in that: The invention comprises a carrier (1), a first drawing board (4) and a second drawing board (5), wherein the first drawing board (4) and the second drawing board (5) are both longitudinally mounted on the carrier (1), the first drawing board (4) is slidably connected to a guide groove (11) on the carrier (1) to realize movement between a first position and a second position, and the second drawing board (5) is fixedly mounted on the carrier (1); In the first position, the first drawing board (4) is located in front of the second drawing board (5) and at least partially covers the second drawing board (5); in the second position, the first drawing board (4) is located directly above the second drawing board (5) and against the upper end of the second drawing board (5), and the first drawing board (4) and the second drawing board (5) are in the same vertical plane.

2. A retractable demonstration device for teaching according to claim 1, characterized in that: The carrier (1) comprises a base (2) and a support portion (3), the support portion (3) comprises two oppositely arranged side rods (31) and a support plate (32) connected between the two side rods (31), the second drawing board (5) is fixedly connected to the support portion (3) and is located between the two side rods (31), the guide grooves (11) are configured into two groups and are symmetrically arranged on opposite sides of the two side rods (31); at least two groups of rollers (41) are installed on both sides of the first drawing board (4) close to the two side rods (31), and the rollers (41) are rollingly connected to the guide grooves (11) on the corresponding sides, and the diameter of the rollers (41) is adapted to the width of the corresponding guide grooves (11).

3. A retractable demonstration device for teaching according to claim 2, characterized in that: The guide groove (11) comprises a first groove body (111) extending upward along the length direction of the side rod (31), a second groove body (112) staggered with the first groove body (111) and consistent with the length direction of the first groove body (111), and a third groove body (113) connected to the second groove body (112) by an inclined transition from the top of the first groove body (111); when the first drawing board (4) is in the first position, the lowest roller (41) abuts against the bottom of the first groove body (111), and when the first drawing board (4) is in the second position, the lowest roller (41) abuts against the bottom of the second groove body (112).

4. A retractable demonstration device for teaching according to claim 3, characterized in that: The portion where the third tank body (113) is connected to the second tank body (112) is higher than the bottom position height of the second tank body (112).

5. A retractable demonstration device for teaching according to claim 3, characterized in that: The base (2) comprises a bottom plate (21), a cross plate (22) and at least one group of telescopic rods (23); the telescopic rods (23) are longitudinally mounted on the bottom plate (21), the cross plate (22) is mounted on the top of the telescopic rods (23), and the support portion (3) is connected to the cross plate (22).

6. A retractable demonstration device for teaching according to claim 5, characterized in that: The telescopic rod (23) comprises a sleeve rod (24), a main rod (25) and a first latch (26); the main rod (25) is slidably connected to a slide groove (241) on the sleeve rod (24); the main rod (25) is provided with a first through hole (251) extending transversely; the sleeve rod (24) is provided with a plurality of second through holes (242) distributed at equal intervals along its length direction; the first latch (26) is inserted into the first through hole (251) and any one of the second through holes (242) to achieve length adjustment of the telescopic rod (23).

7. A retractable demonstration device for teaching according to claim 5, characterized in that: A rotating shaft (33) is provided at the center of the support plate (32), and the rotating shaft (33) is rotatably connected to a rotating hole (221) on the horizontal plate (22). An annular protrusion (12) coaxial with the rotating hole (221) is also fixedly mounted on the horizontal plate (22), and a plurality of first positioning holes (121) penetrating the annular protrusion (12) are arranged around the annular protrusion (12), and a plurality of second positioning holes (331) penetrating the annular protrusion (12) are arranged around the rotating shaft (33), and a second latch (13) is inserted into one of the first positioning hole (121) and the second positioning hole (331) to limit the rotating shaft (33).

8. A retractable demonstration device for teaching according to claim 3 or 7, characterized in that: The outer end of one of the side rods (31) is provided with a first plug hole (311) which runs transversely through the body and is located at the second groove body (112); the first drawing board (4) is formed with a second plug hole (42) corresponding to the first plug hole (311) on one side close to the side rod (31); when the first drawing board (4) is in the second position, the first plug hole (311) faces the second plug hole (42), and a third plug pin (14) is inserted into the first plug hole (311) and the second plug hole (42) to limit the position of the first drawing board (4).

9. A retractable demonstration device for teaching according to claim 5, characterized in that: A plurality of casters (27) are also installed at the lower end of the base plate (21).

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