CN112967573B - Teaching device - Google Patents
Teaching device Download PDFInfo
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- CN112967573B CN112967573B CN202110271606.9A CN202110271606A CN112967573B CN 112967573 B CN112967573 B CN 112967573B CN 202110271606 A CN202110271606 A CN 202110271606A CN 112967573 B CN112967573 B CN 112967573B
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- teaching
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09B—EDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
- G09B19/00—Teaching not covered by other main groups of this subclass
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09B—EDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
- G09B1/00—Manually or mechanically operated educational appliances using elements forming, or bearing, symbols, signs, pictures, or the like which are arranged or adapted to be arranged in one or more particular ways
- G09B1/02—Manually or mechanically operated educational appliances using elements forming, or bearing, symbols, signs, pictures, or the like which are arranged or adapted to be arranged in one or more particular ways and having a support carrying or adapted to carry the elements
- G09B1/16—Manually or mechanically operated educational appliances using elements forming, or bearing, symbols, signs, pictures, or the like which are arranged or adapted to be arranged in one or more particular ways and having a support carrying or adapted to carry the elements the elements each bearing a plurality of different symbols, signs, or combinations of symbols and signs, only one symbol, sign, or combination thereof, of each element to be used at a time
- G09B1/18—Manually or mechanically operated educational appliances using elements forming, or bearing, symbols, signs, pictures, or the like which are arranged or adapted to be arranged in one or more particular ways and having a support carrying or adapted to carry the elements the elements each bearing a plurality of different symbols, signs, or combinations of symbols and signs, only one symbol, sign, or combination thereof, of each element to be used at a time the elements being rotatable
- G09B1/20—Manually or mechanically operated educational appliances using elements forming, or bearing, symbols, signs, pictures, or the like which are arranged or adapted to be arranged in one or more particular ways and having a support carrying or adapted to carry the elements the elements each bearing a plurality of different symbols, signs, or combinations of symbols and signs, only one symbol, sign, or combination thereof, of each element to be used at a time the elements being rotatable and bearing the symbols on a surface parallel to the axis of rotation
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- Engineering & Computer Science (AREA)
- Business, Economics & Management (AREA)
- Physics & Mathematics (AREA)
- Educational Administration (AREA)
- Educational Technology (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Entrepreneurship & Innovation (AREA)
- Displays For Variable Information Using Movable Means (AREA)
Abstract
The invention relates to a teaching device which comprises a teaching box and a support, wherein the teaching box is cuboid, the support is vertically arranged on the lower surface of the teaching box, the teaching box comprises a box body, the box body is a cuboid shell with an opening at the rear end, a rectangular opening is formed in the front end surface of the box body, a detachable sealing plate is arranged at the opening at the rear end of the box body, a plurality of display assemblies are arranged in the box body, the display assemblies are in an overturned U shape and comprise rollers, positioning plates and spokes, and the display assemblies are sleeved in a stacking mode. The invention aims to solve or at least reduce the problems that most of the existing teaching aids only have a single display function, are not easy to set suspense and excite the learning interest of students, and provides a teaching device.
Description
Technical Field
The invention relates to a teaching device.
Background
The teaching aid is an intuitive teaching method adopted in teacher teaching, and the teacher sets suspense and hammer language and simultaneously uses intuitive teaching to arouse the learning interest of students. Most of the existing teaching aids only have a single display function, are not easy to set suspense and arouse the learning interest of students.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, solve or at least lighten the problems that most of the existing teaching aids only have single display functions, are not easy to set suspense and arouse the learning interest of students, and provide a teaching device.
The invention is realized by the following technical scheme:
a teaching device comprises a teaching box and a support, wherein the teaching box is cuboid, and the support is vertically arranged on the lower surface of the teaching box;
the teaching box comprises a box body, the box is rear end open-ended cuboid casing form, and the terminal surface is provided with the rectangle opening before the box, and box rear end opening part is provided with the detachable shrouding, is provided with multiunit show subassembly in the box, the show subassembly is the U-shaped of upset, and the show subassembly includes cylinder, locating plate and spoke, two that the cylinder set up from top to bottom, cylinder both ends are connected with the box rotation, and two cylinder synchronous drive are connected, the locating plate is made by transparent material, and the locating plate is vertical to be set up in box front end opening part, the spoke both ends are fixed respectively twined in two cylinders, and the locating plate is walked around in the middle part of the spoke slides, and the range upon range of registrate of multiunit show subassembly.
In order to further implement the present invention, the following technical solutions may be preferably selected:
preferably, the length value of the roller is greater than the width value of the opening at the front end of the box body, rotating shafts are arranged at two ends of the roller, one end of each rotating shaft is fixedly connected with the roller in a coaxial mode, and the other end of each rotating shaft is rotatably connected with the box body.
Preferably, one side of the rotating shaft close to the rollers is fixedly sleeved with a synchronous chain wheel, and the synchronous chain wheels of the two rollers of the display assembly are in transmission connection through a chain.
Preferably, the multiunit the one end of show subassembly is provided with a transmission assembly, a transmission assembly includes first electromagnetic clutch and a transmission gear, the pivot includes interior axle and outer axle, interior axle and cylinder fixed connection, outer axle rotates with the box to be connected, and the fixed cover of a transmission gear closes in the outer axle, first electromagnetic clutch sets up between interior axle and outer axle, and the first transmission gear intermeshing of the cylinder that is located top or below of adjacent two sets of show subassemblies.
Preferably, the first transmission assembly is provided with a first power mechanism, the first power mechanism comprises a first motor and a first transmission shaft, the first motor is fixedly arranged in the box body, the first transmission shaft is vertically arranged on one side in the box body, one end of the first transmission shaft is in transmission connection with any outer shaft connected with the first transmission assembly through a worm and gear mechanism, and the other end of the first transmission shaft is in transmission connection with an output shaft of the first motor through the worm and gear mechanism.
Preferably, the multiunit the one end of keeping away from first drive assembly of show subassembly is provided with second drive assembly, second drive assembly includes second electromagnetic clutch and second driving sprocket, and the fixed cover of second driving sprocket closes in the outer axle, second electromagnetic clutch sets up between interior axle and outer axle, and the second driving sprocket of the cylinder that is located top or below of two sets of adjacent show subassemblies passes through chain drive and connects.
Preferably, the second transmission assembly is provided with a second power mechanism, the second power mechanism comprises a second motor and a second transmission shaft, the second motor is fixedly arranged in the box body, the second transmission shaft is vertically arranged on one side in the box body, one end of the second transmission shaft is in transmission connection with any outer shaft connected with the second transmission assembly through a worm and gear mechanism, and the other end of the second transmission shaft is in transmission connection with an output shaft of the second motor through the worm and gear mechanism.
Preferably, the upper and lower both ends of locating plate all are the arc, and distance value between two adjacent locating plates equals the thickness value of spoke, all is provided with blend stop, two between two adjacent locating plates the blend stop is located the locating plate both ends respectively, and distance value between two blend stops equals the width value of spoke.
Preferably, be located the inboard the spoke of show subassembly is made by opaque material, and the spoke of remaining show subassembly is made by the printing opacity material, is provided with image and blank area on all spokes, the size of blank area corresponds with the open-ended size of terminal surface rectangle before the box.
Preferably, the support comprises an upper support rod, a lower support sleeve and support legs, the upper end of the upper support rod is fixedly connected with the box body, the lower portion of the upper support rod is longitudinally slidably sleeved in the lower support sleeve, the support legs are circumferentially arranged on the outer side of the lower portion of the lower support sleeve in a surrounding mode, the support legs comprise upper legs, middle legs and lower legs, the upper legs are longitudinally slidably arranged on the outer side of the lower support sleeve, the lower ends of the upper legs and the upper ends of the lower legs are spherical and rotatably embedded in the upper ends and the lower ends of the middle legs respectively, each middle leg comprises an inner middle leg, an outer middle leg and a locking rod, the lower ends of the upper legs and the upper ends of the lower legs are rotatably arranged between the inner middle legs and the outer middle legs, one end of the locking rod is rotatably arranged in the middle of the inner middle legs, the other end of the locking rod extends out of the outer middle legs in a threaded manner.
Through the technical scheme, the invention has the beneficial effects that:
the teaching box is internally provided with a plurality of groups of display assemblies which are sleeved in a stacked mode, spokes of the display assemblies are arranged in a stacked mode, images on the spokes can be displayed independently through the rectangular opening in the front end face of the box body, the images on the spokes can also be displayed in a stacked mode, the images on the spokes can be conveniently set for suspense, and learning interests of students can be easily aroused.
The invention is provided with the first transmission assembly and the second transmission assembly, can drive the rollers of the display assembly to rotate, changes the position state of the spokes to display different images, can enable the rollers of different display assemblies to synchronously rotate in the same direction through the first transmission assembly, and can enable the rollers of different display assemblies to synchronously rotate in opposite directions through the first transmission assembly, thereby improving the image adjusting efficiency.
The support comprises the upper support rod, the lower support sleeve and the support legs, so that the height and the angle position of the teaching box can be conveniently adjusted, the teaching box can be conveniently and properly adjusted according to the field condition, and students can conveniently watch images displayed by the teaching box.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of the teaching box of the present invention with the closing plate removed;
FIG. 3 is a schematic view of the teaching box of the present invention with the box, closure plate and spokes removed;
FIG. 4 is a longitudinal structural sectional view of the teaching box of the present invention;
FIG. 5 is a cross-sectional view of the teaching box of the present invention;
FIG. 6 isbase:Sub>A cross-sectional view taken at A-A of FIG. 5 in accordance with the present invention;
FIG. 7 is a cross-sectional view taken at B-B of FIG. 5 in accordance with the present invention;
FIG. 8 is a schematic view of the construction of the drum of the present invention;
FIG. 9 is a schematic view of a positioning plate according to the present invention;
FIG. 10 is a schematic view of the construction of the stent of the present invention;
FIG. 11 is a schematic view of the structure of the stand bar of the present invention;
wherein: 1-a box body; 2-closing the plate; 3-a roller; 4, positioning a plate; 5-spokes; 6-a rotating shaft; 7-a synchronous sprocket; 8-a first electromagnetic clutch; 9-a first transmission gear; 10-a first electric machine; 11-a first drive shaft; 12-a second electromagnetic clutch; 13-a second drive sprocket; 14-a second electric machine; 15-a second drive shaft; 16-a barrier strip; 17-upper support rod; 18-lower supporting sleeve; 19-a leg; 20-upper leg; 21-middle leg; 22-lower leg; 23-inner medial leg; 24-outer middle leg; 25-a locking lever; 26-an inner shaft; 27-outer shaft.
Detailed Description
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention,
it is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1:
as shown in fig. 1-11, a teaching device is characterized by comprising a teaching box and a support, wherein the teaching box is cuboid, and the support is vertically arranged on the lower surface of the teaching box; the teaching box includes box 1, box 1 is rear end open-ended cuboid casing form, 1 preceding terminal surface of box is provided with the rectangle opening, 1 rear end opening part of box is provided with detachable shrouding 2, be provided with multiunit show subassembly in the box 1, the show subassembly is the U-shaped of upset, the show subassembly includes cylinder 3, locating plate 4 and spoke 5, cylinder 3 is two of setting from top to bottom, 3 both ends of cylinder are rotated with box 1 and are connected, two 3 synchronous drive of cylinder are connected, locating plate 4 is made by transparent material, 4 vertical settings in 1 front end opening part of box of locating plate, 5 both ends of spoke are fixed winding respectively in two cylinders 3, locating plate 4 is walked around in the slip of 5 middle parts of spoke, the range upon range of registrate of multiunit show subassembly closes.
In order to optimize the product structure, in this embodiment, the length value of cylinder 3 is greater than the open-ended width value in front of box 1, and cylinder 3 both ends all are provided with pivot 6, and pivot 6 one end is connected with the coaxial fixed connection of cylinder 3, the other end and box 1 rotate to be connected, and pivot 6 is close to one side fixed the registrate of cylinder 3 and has synchronous sprocket 7, shows to connect through chain drive between the synchronous sprocket 7 of two cylinders 3 of subassembly.
In order to enable the plurality of rollers 3 to synchronously rotate in the same direction, one end of each of the display assemblies is provided with a first transmission assembly, the first transmission assembly comprises a first electromagnetic clutch 8 and a first transmission gear 9, the rotating shaft 6 comprises an inner shaft 26 and an outer shaft 27, the inner shaft 26 is fixedly connected with the rollers 3, the outer shaft 27 is rotatably connected with the box body 1, the first transmission gear 9 is fixedly sleeved on the outer shaft 27, the first electromagnetic clutch 8 is arranged between the inner shaft 26 and the outer shaft 27, the first transmission gears 9 of the rollers 3 positioned above or below the two adjacent display assemblies are mutually meshed, the first transmission assembly is provided with a first power mechanism, the first power mechanism comprises a first motor 10 and a first transmission shaft 11, the first motor 10 is fixedly arranged in the box body 1, the first transmission shaft 11 is vertically arranged on one side in the box body 1, one end of the first transmission shaft 11 is in transmission connection with any outer shaft 27 connected with the first transmission assembly through a worm gear mechanism, and the other end of the first transmission shaft 11 is in transmission connection with an output shaft of the first motor 10 through a worm gear mechanism; when the roller 3 needs to rotate, the first electromagnetic clutch 8 of the roller 3 is attracted, so that the inner shaft 26 and the outer shaft 27 are connected into a whole, the first motor 10 drives all the outer shafts 27 to rotate through the first transmission shaft 11 and the first transmission gear 9, the roller 3 is further rotated, and the position state of the spokes 5 is changed to display different images.
In order to enable the plurality of rollers 3 to synchronously and reversely rotate, one end of each of the display assemblies, which is far away from the first transmission assembly, is provided with a second transmission assembly, the second transmission assembly comprises a second electromagnetic clutch 12 and a second transmission chain wheel 13, the second transmission chain wheel 13 is fixedly sleeved on the outer shaft 27, the second electromagnetic clutch 12 is arranged between the inner shaft 26 and the outer shaft 27, the second transmission chain wheels 13 of the rollers 3, which are positioned above or below the two adjacent groups of display assemblies, are in transmission connection through chains, the second transmission assembly is provided with a second power mechanism, the second power mechanism comprises a second motor 14 and a second transmission shaft 15, the second motor 14 is fixedly arranged in the box body 1, the second transmission shaft 15 is vertically arranged on one side in the box body 1, one end of the second transmission shaft 15 is in transmission connection with any outer shaft 27 connected with the second transmission assembly through a worm gear mechanism, and the other end of the second transmission shaft 15 is in transmission connection with an output shaft of the second motor 14 through a worm gear mechanism; when the roller 3 needs to rotate, the second electromagnetic clutch 12 of the roller 3 is attracted, so that the inner shaft 26 and the outer shaft 27 are connected into a whole, the second motor 14 drives all the outer shafts 27 to rotate through the second transmission shaft 15 and the second transmission chain wheel 13, further, the roller 3 rotates, and the position state of the spokes 5 is changed to display different images.
In order to enable the spokes 5 to be aligned with the rectangular opening of the front end face of the box body 1, the upper end and the lower end of each positioning plate 4 are arc-shaped, the distance value between every two adjacent positioning plates 4 is equal to the thickness value of the spokes 5, barrier strips 16 are arranged between every two adjacent positioning plates 4, the two barrier strips 16 are respectively located at the two ends of each positioning plate 4, and the distance value between the two barrier strips 16 is equal to the width value of the spokes 5.
For the convenience of viewing, the spokes 5 of the display component positioned at the inner side are made of opaque materials, the spokes 5 of the rest display components are made of light-transmitting materials, images and blank areas are arranged on all the spokes 5, and the size of each blank area corresponds to the size of the rectangular opening of the front end face of the box body 1.
In order to adjust the position state of the teaching box conveniently, the support comprises an upper support rod 17, a lower support sleeve 18 and support legs 19, the upper end of the upper support rod 17 is fixedly connected with the box body 1, the lower portion of the upper support rod 17 is longitudinally sleeved in the lower support sleeve 18 in a sliding mode, a plurality of support legs 19 are circumferentially arranged on the outer side of the lower portion of the lower support sleeve 18 in an array mode, each support leg comprises an upper leg 20, a middle leg 21 and a lower leg 22, the upper legs 20 are longitudinally arranged on the outer side of the lower support sleeve 18 in a sliding mode, the lower ends of the upper legs 20 and the upper ends of the lower legs 22 are spherical and are respectively embedded in the upper ends and the lower ends of the middle legs 21 in a rotating mode, the middle legs 21 comprise inner middle legs 23, outer middle legs 24 and locking rods 25, the lower ends of the upper legs 20 and the upper ends of the lower legs 22 are respectively rotatably arranged between the inner middle legs 23 and the outer middle legs 24, one end of the locking rods 25 are rotatably arranged in the middle of the inner middle legs 23, the other end of the outer middle legs 24 extend out, and the middle portions of the locking rods 25 are sleeved in the middle legs in the middle portions of the outer legs 24 in a threaded mode.
A plurality of groups of display assemblies which are sleeved in a stacked mode are arranged in the teaching box, spokes 5 of the plurality of groups of display assemblies are arranged in a stacked mode, images on the spokes 5 can be displayed independently through a rectangular opening in the front end face of the box body 1, images on the spokes 5 can also be displayed in a stacked mode, suspense can be conveniently set, and learning interests of students can be easily aroused.
The invention is provided with a first transmission component and a second transmission component, can drive the rollers 3 of the display components to rotate, changes the position state of the spokes 5 so as to display different images, can enable the rollers 3 of different display components to synchronously rotate in the same direction through the first transmission component, and can enable the rollers 3 of different display components to synchronously rotate in the opposite direction through the first transmission component, thereby improving the image adjusting efficiency.
The support comprises an upper support rod 17, a lower support sleeve 18 and support legs 19, so that the height and the angle position of the teaching box can be conveniently adjusted, the teaching box can be conveniently and properly adjusted according to the on-site condition, and students can conveniently watch images displayed by the teaching box.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.
Claims (4)
1. The teaching device is characterized by comprising a teaching box and a support, wherein the teaching box is cuboid, and the support is vertically arranged on the lower surface of the teaching box;
the teaching box comprises a box body (1), the box body (1) is in a cuboid shell shape with an opening at the rear end, a rectangular opening is arranged on the front end face of the box body (1), a detachable sealing plate (2) is arranged at the opening at the rear end of the box body (1), a plurality of groups of display assemblies are arranged in the box body (1), the display assemblies are in a U shape and turn over, each display assembly comprises a roller (3), a positioning plate (4) and spokes (5),
the two rollers (3) are arranged up and down, two ends of each roller (3) are rotatably connected with the box body (1), the two rollers (3) are synchronously connected in a transmission manner, the positioning plate (4) is made of transparent materials, the positioning plate (4) is vertically arranged at an opening at the front end of the box body (1), two ends of the spoke (5) are respectively and fixedly wound on the two rollers (3), the middle part of the spoke (5) bypasses the positioning plate (4) in a sliding manner, and a plurality of groups of display assemblies are overlapped and sleeved in a laminated manner;
the length value of the roller (3) is greater than the width value of the opening at the front end of the box body (1), rotating shafts (6) are arranged at two ends of the roller (3), one end of each rotating shaft (6) is coaxially and fixedly connected with the roller (3), and the other end of each rotating shaft is rotatably connected with the box body (1);
a synchronous chain wheel (7) is fixedly sleeved on one side of the rotating shaft (6) close to the rollers (3), and the synchronous chain wheels (7) of the two rollers (3) of the display assembly are in transmission connection through a chain;
one end of each of the display assemblies is provided with a first transmission assembly, each first transmission assembly comprises a first electromagnetic clutch (8) and a first transmission gear (9), each rotating shaft (6) comprises an inner shaft (26) and an outer shaft (27), the inner shafts (26) are fixedly connected with the rollers (3), the outer shafts (27) are rotatably connected with the box body (1), the first transmission gears (9) are fixedly sleeved on the outer shafts (27), the first electromagnetic clutches (8) are arranged between the inner shafts (26) and the outer shafts (27), and the first transmission gears (9) of the rollers (3) above or below the adjacent two display assemblies are meshed with each other;
the first transmission assembly is provided with a first power mechanism, the first power mechanism comprises a first motor (10) and a first transmission shaft (11), the first motor (10) is fixedly arranged in the box body (1), the first transmission shaft (11) is vertically arranged on one side in the box body (1), one end of the first transmission shaft (11) is in transmission connection with any outer shaft (27) connected with the first transmission assembly through a worm and gear mechanism, and the other end of the first transmission shaft (11) is in transmission connection with an output shaft of the first motor (10) through the worm and gear mechanism;
one end, far away from the first transmission assembly, of each display assembly is provided with a second transmission assembly, each second transmission assembly comprises a second electromagnetic clutch (12) and a second transmission chain wheel (13), the second transmission chain wheels (13) are fixedly sleeved on the outer shaft (27), the second electromagnetic clutches (12) are arranged between the inner shaft (26) and the outer shaft (27), and the second transmission chain wheels (13) of the drums (3) above or below the two adjacent display assemblies are in transmission connection through chains;
the second transmission assembly is provided with a second power mechanism, the second power mechanism comprises a second motor (14) and a second transmission shaft (15), the second motor (14) is fixedly arranged in the box body (1), the second transmission shaft (15) is vertically arranged on one side in the box body (1), one end of the second transmission shaft (15) is in transmission connection with any outer shaft (27) connected with the second transmission assembly through a worm and gear mechanism, and the other end of the second transmission shaft (15) is in transmission connection with an output shaft of the second motor (14) through the worm and gear mechanism.
2. A teaching device as claimed in claim 1, wherein the upper and lower ends of the positioning plates (4) are arc-shaped, the distance between two adjacent positioning plates (4) is equal to the thickness of the spoke (5), a barrier strip (16) is arranged between two adjacent positioning plates (4), two barrier strips (16) are respectively located at the two ends of the positioning plates (4), and the distance between two barrier strips (16) is equal to the width of the spoke (5).
3. An educational device in accordance with claim 1, characterized in that the spokes (5) of the display module located inside are made of opaque material, the spokes (5) of the remaining display modules are made of transparent material, all spokes (5) are provided with images and blank areas, the size of the blank areas corresponds to the size of the rectangular opening of the front end face of the case (1).
4. The teaching device as claimed in claim 1, wherein the support comprises an upper support rod (17), a lower support sleeve (18) and support legs (19), the upper end of the upper support rod (17) is fixedly connected with the box body (1), the lower portion of the upper support rod (17) is longitudinally slidably sleeved in the lower support sleeve (18), a plurality of support legs (19) are circumferentially arranged outside the lower portion of the lower support sleeve (18), each support leg comprises an upper leg (20), a middle leg (21) and a lower leg (22), the upper leg (20) is longitudinally slidably arranged outside the lower support sleeve (18), the lower end of the upper leg (20) and the upper end of the lower leg (22) are spherical and are respectively rotatably embedded between the upper end and the lower end of the middle leg (21), the middle leg (21) comprises an inner middle leg (23), an outer middle leg (24) and a locking rod (25), the lower end of the upper leg (20) and the upper end of the lower leg (22) are rotatably arranged between the inner middle leg (23) and the outer middle leg (24), one end of the locking rod (25) is rotatably arranged between the middle leg (23) and the middle leg (24), and the other end of the middle leg (24) extends out of the middle leg (24).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110271606.9A CN112967573B (en) | 2021-03-12 | 2021-03-12 | Teaching device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110271606.9A CN112967573B (en) | 2021-03-12 | 2021-03-12 | Teaching device |
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| CN112967573A CN112967573A (en) | 2021-06-15 |
| CN112967573B true CN112967573B (en) | 2023-03-21 |
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