Portable simple lever demonstration teaching aid

Abstract

The utility model belongs to the technical field of teaching aids, particularly relates to a portable simple lever demonstration teaching aid, and aims to solve the problem that the length of a lever cannot be adjusted as required so as to adapt to different demonstration occasions due to the fact that the teaching aid does not have an adjusting function. A height adjusting rod is slidably mounted in a cavity in the top of the supporting column, a hollow lever ruler is rotatably mounted on one side of the height adjusting rod, a hanging ring with the same scale line interval as the hollow lever ruler is arranged at the bottom of the outer wall of the hollow lever ruler, and extension rulers are slidably mounted in cavities in the two ends of the hollow lever ruler. And the extension ruler is provided with hanging holes which are consistent with the scale marks at intervals. When the teaching aid is used, the height and the length of the teaching aid can be conveniently adjusted so as to meet different teaching demonstration requirements, and meanwhile, the teaching aid is simple in structure, convenient to operate and carry and very suitable for teaching.

Description

Technical Field

[0001] The utility model relates to the technical field of teaching aids, in particular to a portable simple lever demonstration teaching aid. Background Art

[0002] Lever demonstration teaching aids are tools used in physics to demonstrate the lever principle and lever balance conditions. These teaching aids can help students more intuitively understand how levers work and their applications in daily life and engineering. Among them, the lever scale and bracket are the most basic lever demonstration teaching aids, usually consisting of a rotatable lever and a bracket. Objects of different weights can be hung on both ends of the lever. By adjusting the position and weight of the object, the lever's balance condition and effort-saving principle can be demonstrated.

[0003] After searching, the patent with announcement number CN205508218U discloses a portable lever demonstration teaching aid, including a box body, a weight slot, a card slot, a bracket, a rotating buckle, a box cover, a cross bar, a hook, a card block A, a magnetic strip A, a card slot A, a spring A, a card slot B, a card block B, a magnetic strip B and a spring; a weight slot is provided in the box body, a card slot is provided on the outside of the box body, a magnetic strip A is provided on the left side panel of the box body, and a bracket is connected to the bottom plate of the box body through a hinge; a magnetic strip B is provided on the left side of the bracket, the bracket can be folded, a card slot B is provided on the upper part of the bracket, a card block B is provided on the lower part, a cross bar is spliced ​​on the upper end of the bracket, the cross bar can be folded, a card block A is provided on the right part of the cross bar, a card slot A is provided on the left part, a slide rail is provided inside the cross bar, a hook is provided in the slide rail, and a scale is provided on the surface of the cross bar.

[0004] Although the portable lever demonstration teaching aids mentioned above are convenient for teachers to carry, the teaching aids themselves do not have an adjustment function, resulting in the length of the lever being unable to be adjusted as needed to adapt to different demonstration occasions.

[0005] In view of the above problems, the utility model document proposes a portable and simple lever demonstration teaching aid. Utility Model Content

[0006] The utility model provides a portable simple lever demonstration teaching aid, which solves the disadvantage in the prior art that the teaching aid itself has no adjustment function, resulting in the length of the lever being unable to be adjusted as required to adapt to different demonstration occasions.

[0007] The utility model provides the following technical solutions:

[0008] A portable and simple lever demonstration teaching aid, comprising:

[0009] A base, a support column is arranged above the base, a height adjustment rod is slidably installed in the cavity at the top of the support column, a hollow lever ruler is rotatably installed on one side of the height adjustment rod, a hanging ring is arranged at the bottom of the outer wall of the hollow lever ruler with the same interval as its scale lines, and extension rulers are slidably installed in the cavities at both ends of the hollow lever ruler, and the extension ruler is provided with hanging holes with the same interval as its scale lines;

[0010] The adjustment component is arranged in the hollow lever ruler and is used to adjust the extension distance of the two extension rulers at the same time, so as to adapt to different demonstration occasions.

[0011] In a possible design, the adjustment assembly includes two threaded rods rotatably mounted in the hollow lever ruler through a plurality of mounting plates, the threaded rods are threadedly connected with a matching sliding seat, the bottom of the sliding seat is fixedly connected to the top of the corresponding extension ruler, one end of the threaded rod passes through the outer wall of one of the mounting plates and is fixedly provided with a first bevel gear, a second bevel gear is rotatably mounted at the center of the top of the inner wall of the hollow lever ruler, the two first bevel gears are meshed with the second bevel gear, and the meshing top of the second bevel gear passes through the top of the outer wall of the hollow lever ruler and is fixedly provided with a bolt.

[0012] In a possible design, a locking nut for locking the position of the bolt is threadedly connected to the bolt, and the locking nut is located between the screw cap of the bolt and the top of the outer wall of the hollow lever ruler.

[0013] In a possible design, a limit slider is fixedly provided on the top of the sliding seat, and a limit slot slidably connected to the corresponding limit slider is provided on the top of the inner wall of the hollow lever.

[0014] In a possible design, an insert tube for inserting and fixing the bottom of the support column is fixedly provided at the center of the top of the base.

[0015] In a possible design, a threaded bolt for locking the extension length of the height adjustment rod is threadedly connected to the support column.

[0016] It should be understood that the above general description and the following detailed description are merely exemplary and do not limit the present invention.

[0017] In the present application, when in use, the bottom of the support column is inserted into the insert tube at the top of the base to ensure that the support column is stably fixed on the base. According to the needs of the demonstration, the extended length of the height adjustment rod is adjusted by rotating the threaded bolt on the support column, and then the threaded bolt is fixed to lock the height;

[0018] When adjusting the length of the lever ruler, rotate the bolt. Since the bolt is fixedly connected to the second bevel gear, the second bevel gear will be driven to rotate. Since the two first bevel gears are meshed with the second bevel gear, the two first bevel gears will also rotate at the same time, thereby driving the threaded rod fixedly connected thereto to rotate. The rotation of the threaded rod will cause the sliding seat threaded thereon to slide on the threaded rod. Since the sliding seat is fixedly connected to the top of the extension ruler, the extension distance of the two extension rulers will be adjusted at the same time. After adjusting to the appropriate length, tighten the locking nut to lock the position of the bolt, thereby fixing the extension length of the extension ruler.

[0019] Afterwards, weights or objects of different weights are hung through the hanging ring and the hanging hole to demonstrate the lever principle. The length of the extension ruler can be further adjusted as needed to adapt to different demonstration occasions.

[0020] The utility model has the following beneficial effects:

[0021] Portability: The various parts of the teaching aid are assembled through simple plug-in and threaded connections, which is easy to carry and store and suitable for different teaching environments;

[0022] Height adjustable: By adjusting the extension length of the height adjustment rod, the height of the lever ruler can be easily changed to accommodate students of different heights or different demonstration needs;

[0023] Adjustable length: By adjusting the components, the extension distance of the two extension rulers can be easily adjusted at the same time, so as to adapt to different demonstration occasions and enhance the flexibility and practicality of the teaching aids;

[0024] Easy to operate: Each part of the teaching aid can be adjusted by simple rotation and tightening operations, without complicated tools or steps, which reduces the difficulty of operation and improves the efficiency of use;

[0025] The utility model can be conveniently adjusted in height and length to meet different teaching demonstration requirements, and at the same time has a simple structure, is easy to operate, and is convenient to carry, and is very suitable for teaching use. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A three-dimensional structural schematic diagram of a portable simple lever demonstration teaching aid provided by an embodiment of the utility model;

[0027] Figure 2 A schematic diagram of the disassembled structure of a portable simple lever demonstration teaching aid provided by an embodiment of the utility model;

[0028] Figure 3 A schematic diagram of the internal structure of a hollow lever ruler of a portable simple lever demonstration teaching aid provided by an embodiment of the utility model;

[0029] Figure 4 This is a schematic diagram of the enlarged structure of point A of a portable simple lever demonstration teaching aid provided by an embodiment of the utility model;

[0030] Figure 5 This is a schematic diagram of the enlarged structure of point B of a portable simple lever demonstration teaching aid provided by an embodiment of the utility model.

[0031] Figure numerals: 1. base; 2. insert; 3. support column; 4. height adjustment rod; 5. threaded bolt; 6. hollow lever ruler; 7. extension ruler; 8. mounting plate; 9. threaded rod; 10. sliding seat; 11. limiting slider; 12. limiting slide groove; 13. first bevel gear; 14. second bevel gear; 15. bolt; 16. locking nut; 17. hanging hole; 18. hanging ring. DETAILED DESCRIPTION

[0032] 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 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.

[0033] In the description of the present invention, it should be understood that the terms "opening", "upper", "middle", "length", "inside" and the like indicating orientation or positional relationship are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0034] In order to keep the following description of the embodiments of the present invention clear and concise, the present invention omits detailed descriptions of known functions and known components.

[0035] Embodiment 1

[0036] Please refer to Figure 1-5 , a portable and simple lever demonstration teaching aid, which is used in the field of teaching aids, including:

[0037] A base 1 is provided with a support column 3 above the base 1. An insert tube 2 is fixedly provided in the center of the top of the base 1. The insert tube 2 is used to insert and fix the bottom of the support column 3 to stably support the entire teaching aid and facilitate the disassembly and installation of the support column 3. The support column 3 is a hollow structure, and a height adjustment rod 4 is slidably installed in the top cavity thereof. A threaded screw bolt 5 is threadedly connected to the support column 3 to lock the extended length of the height adjustment rod 4, thereby adjusting the height of the entire lever ruler;

[0038] A hollow lever scale 6 is rotatably mounted on one side of the height adjustment rod 4, and a hanging ring 18 is provided at the bottom of the outer wall thereof at the same interval as the scale line, which is used to hang weights or objects of different weights to demonstrate the lever principle. An extension scale 7 is slidably mounted in the cavities at both ends of the hollow lever scale 6, and a hanging hole 17 is provided on the extension scale 7 at the same interval as the scale line, which is used to increase the length of the lever scale when needed;

[0039] The adjustment assembly is arranged in the hollow lever ruler 6, and includes two threaded rods 9 rotatably installed through a plurality of mounting plates 8, a sliding seat 10 is threadedly connected to the threaded rod 9, and the bottom of the sliding seat 10 is fixedly connected to the top of the corresponding extension ruler 7, one end of the threaded rod 9 passes through the outer wall of one of the mounting plates 8 and is fixedly provided with a first bevel gear 13, and a second bevel gear 14 is rotatably installed at the center of the top of the inner wall of the hollow lever ruler 6, and the two first bevel gears 13 are both meshed with the second bevel gear 14, and the top of the second bevel gear 14 passes through the top of the outer wall of the hollow lever ruler 6 and is fixedly provided with a bolt 15, and by rotating the bolt 15, the two threaded rods 9 can be driven to rotate simultaneously, thereby adjusting the extension distance of the two extension rulers 7 to adapt to different demonstration occasions;

[0040] A locking nut 16 is threadedly connected to the bolt 15, and the locking nut 16 is located between the screw cap of the bolt 15 and the top of the outer wall of the hollow lever ruler 6. When adjusted to a suitable length, the locking nut 16 can be tightened to increase the friction with the top of the outer wall of the hollow lever ruler 6 to lock the position of the bolt 15, thereby fixing the extended length of the extension ruler 7.

[0041] Embodiment 2

[0042] Improvements based on Example 1:

[0043] Please refer to Figure 3 and Figure 5 A limit slider 11 is fixedly arranged on the top of the sliding seat 10, and a limit slot 12 is provided on the top of the inner wall of the hollow lever ruler 6 which is slidably connected to the corresponding limit slider 11. The coordinated use of the limit slider 11 and the limit slot 12 ensures that the sliding seat 10 slides stably on the threaded rod 9 to prevent it from rotating or shaking.

[0044] The above are only specific implementations of the utility model, but the protection scope of the utility model is not limited to them. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the utility model, which should be included in the protection scope of the utility model; in the absence of conflicts, the embodiments of the utility model and the features in the embodiments can be combined with each other. Therefore, the protection scope of the utility model shall be based on the protection scope of the claims.

Claims

1. A portable and simple lever demonstration teaching aid, characterized in that: include: A base (1), a support column (3) is arranged above the base (1), a height adjustment rod (4) is slidably installed in a cavity at the top of the support column (3), a hollow lever ruler (6) is rotatably installed on one side of the height adjustment rod (4), a hanging ring (18) is provided at the bottom of the outer wall of the hollow lever ruler (6) with the same interval as the scale line, and extension rulers (7) are slidably installed in the cavities at both ends of the hollow lever ruler (6), and the extension ruler (7) is provided with hanging holes (17) with the same interval as the scale line; The adjustment component is arranged in the hollow lever ruler (6) and is used to simultaneously adjust the extension distance of the two extension rulers (7) so as to adapt to different demonstration occasions.

2. A portable simple lever demonstration teaching aid according to claim 1, characterized in that: The adjustment assembly comprises two threaded rods (9) rotatably mounted in a hollow lever ruler (6) via a plurality of mounting plates (8); a matching sliding seat (10) is threadedly connected to the threaded rods (9); the bottom of the sliding seat (10) is fixedly connected to the top of a corresponding extension ruler (7); one end of the threaded rod (9) passes through the outer wall of one of the mounting plates (8) and is fixedly provided with a first bevel gear (13); a second bevel gear (14) is rotatably mounted at the center of the top of the inner wall of the hollow lever ruler (6); both of the first bevel gears (13) are meshed with the second bevel gear (14); the meshed top of the second bevel gear (14) passes through the top of the outer wall of the hollow lever ruler (6) and is fixedly provided with a bolt (15).

3. A portable simple lever demonstration teaching aid according to claim 2, characterized in that: The bolt (15) is threadedly connected with a locking nut (16) for locking the position of the bolt (15), and the locking nut (16) is located between the screw cap of the bolt (15) and the top of the outer wall of the hollow lever ruler (6).

4. A portable simple lever demonstration teaching aid according to claim 2, characterized in that: A limit slide block (11) is fixedly arranged on the top of the sliding seat (10), and a limit slide groove (12) slidably connected to the corresponding limit slide block (11) is arranged on the top of the inner wall of the hollow lever ruler (6).

5. A portable simple lever demonstration teaching aid according to claim 1, characterized in that: An inserting tube (2) for inserting and fixing the bottom of a supporting column (3) is fixedly arranged at the center of the top of the base (1).

6. A portable simple lever demonstration teaching aid according to claim 1, characterized in that: The support column (3) is threadedly connected with a threaded bolt (5) for locking the extended length of the height adjustment rod (4).

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