A two-point distance contrast demonstration device with variable path length

Abstract

The application discloses a two-point distance contrast demonstration device with variable path length, relates to the technical field of distance contrast demonstration in geometry teaching, and comprises a main body mechanism, wherein the main body mechanism comprises a support frame, locking universal wheels and a placing table are arranged on the support frame, and a demonstration magnetic plate is arranged on the support frame through a rotating shaft. The main body mechanism comprising the support frame, the locking universal wheels, the placing table, the rotating shaft and the demonstration magnetic plate is arranged, so that the device is convenient to move, fix and store as a whole, meanwhile, the demonstration magnetic plate can be swing adjusted relative to the support frame. The limiting mechanism comprising a limiting pin, a limiting groove and a limiting spring is arranged, so that the demonstration magnetic plate can be stably locked when being swung to different angles, thereby simulating a two-point distance demonstration scene under different planes or different observation angles, and the accuracy of a contrast result is prevented from being influenced by accidental rotation of the magnetic plate in a demonstration process.

Description

Technical Field

[0001] This invention relates to the field of distance comparison demonstration technology in geometry teaching, specifically to a device for comparing the distance between two points with a variable path length. Background Technology

[0002] The shortest distance between two points is a straight line, a fundamental axiom in geometry widely used in primary and secondary school mathematics and physics teaching. To help students intuitively understand this concept and the comparison between different path lengths, teachers usually use rulers and compasses to draw diagrams on the blackboard or use simple models of lines connecting two points for explanation. With the development of teaching aids, some demonstration devices that can adjust the distance between two points have also emerged, such as graduated slides or telescopic rods combined with fixed magnetic points, which can demonstrate the change in the straight-line distance between two points to a certain extent.

[0003] However, most existing two-point distance comparison demonstration devices can only display the straight-line distance between two points on the same fixed plane. When it is necessary to demonstrate the visual comparison of the distance between two points under different plane angles, or to keep the telescopic structure between two points stable at a certain precise length for repeated observation and comparison, existing devices often lack reliable swing angle locking function and telescopic length locking function. This makes it easy for the position to change due to accidental touch or structural loosening during the demonstration, thus affecting the accuracy of the comparison results and the teaching effect. Summary of the Invention

[0004] The purpose of this invention is to provide a two-point distance comparison demonstration device with variable path length, in order to solve the problem that most existing two-point distance comparison demonstration devices can only display the straight-line distance between two points in the same fixed plane. When it is necessary to demonstrate the visual comparison of the distance between two points under different plane angles, or when it is necessary to keep the telescopic structure between two points stable at a certain precise length for repeated observation and comparison, existing devices often lack reliable swing angle locking function and telescopic length locking function. This leads to the problem that the position may change due to accidental touch or structural loosening during the demonstration, thereby affecting the accuracy of the comparison results and the teaching effect.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a two-point distance comparison demonstration device with variable path length, comprising a main body, the main body comprising a support frame, the support frame being provided with locking casters and a placement platform, and a demonstration magnetic plate being provided on the support frame via a rotating shaft;

[0006] It also includes a limiting mechanism for locking the swing angle of the demonstration magnetic plate, a pitch-changing mechanism for forming two magnetic attraction points with variable distances on the demonstration magnetic plate, and an adjustment mechanism for locking the length adjusted by the pitch-changing mechanism.

[0007] Furthermore, a drop-proof mat is also provided on the placement platform. The drop-proof mat is located below the demonstration magnetic plate and is made of flexible rubber.

[0008] Furthermore, the limiting mechanism includes a limiting pin disposed on the support frame, a plurality of limiting grooves disposed on the demonstration magnetic plate, and a limiting spring disposed between the limiting pin and the support frame.

[0009] Furthermore, the plurality of limiting grooves are evenly distributed in a semi-circle, and the limiting pin is adapted to the limiting groove, and the limiting pin can be inserted into the corresponding limiting groove.

[0010] Furthermore, the variable pitch mechanism includes two magnetic seats that are magnetically attracted to the demonstration magnetic plate. The magnetic seats are provided with mounting posts, and the two mounting posts are connected by a telescopic rod. The telescopic rod includes a fixed end and a movable end.

[0011] Furthermore, the movable end of the telescopic rod is provided with scale lines.

[0012] Furthermore, the adjustment mechanism includes a plurality of adjustment slots disposed on the movable end of the telescopic rod, and an adjustment handle disposed on the mounting post near the movable end of the telescopic rod. The adjustment handle is connected to the adjustment post, and the adjustment post is adapted to the adjustment slots.

[0013] Furthermore, the plurality of adjustment slots are linearly and uniformly distributed, and the adjustment column can be inserted through the mounting column into the corresponding adjustment slot.

[0014] Furthermore, a reset spring is fitted onto the adjusting column.

[0015] Furthermore, the anti-fall pad can prevent the pitch mechanism from falling to the ground when it detaches.

[0016] Compared with existing technologies, this invention, by setting up a main structure including a support frame, locking casters, a placement platform, a rotating shaft, and a demonstration magnetic plate, makes the device easy to move, fix, and store. Simultaneously, the demonstration magnetic plate can be adjusted by swinging relative to the support frame. By setting up a limiting mechanism including a limiting pin, a limiting groove, and a limiting spring, the demonstration magnetic plate can be stably locked when it swings to different angles, thereby simulating distance demonstration scenarios between two points under different planes or observation angles, preventing accidental rotation of the magnetic plate during the demonstration from affecting the accuracy of the comparison results. By setting up a pitch-changing mechanism including two magnetic bases, a mounting column, and a telescopic rod, the two magnetic bases can be magnetically fixed to any position on the demonstration magnetic plate, and the straight-line distance between the two points can be changed by the extension and retraction of the telescopic rod. At the same time, the scale lines on the telescopic rod allow for quantitative reading of the distance, facilitating precise comparison. The device includes an adjustment mechanism comprising an adjustment slot, an adjustment handle, an adjustment column, and a return spring. Under normal conditions, the return spring is compressed, keeping the adjustment column engaged with the adjustment slot. This ensures the telescopic rod is automatically and reliably locked after adjustment to the desired length, preventing length changes during demonstrations. When adjustment is needed, simply pull the adjustment handle to disengage the adjustment column from the adjustment slot, unlocking the device – a straightforward and effortless operation. A flexible rubber anti-fall pad located beneath the demonstration magnetic plate cushions any accidental detachment of the pitch-changing mechanism from the magnetic plate during disassembly or adjustment, preventing damage to the ground and effectively extending the device's lifespan. In summary, the entire device is compact, easy to operate, provides intuitive and reliable demonstrations, and effectively meets the needs of teaching scenarios for comparing different path lengths between two points. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0018] Figure 1 This is a schematic diagram of the overall structure provided for an embodiment of the present invention;

[0019] Figure 2 This is a schematic diagram of the structure of the limiting mechanism provided in an embodiment of the present invention;

[0020] Figure 3 A schematic diagram of the variable pitch mechanism provided in an embodiment of the present invention. Figure 1 ;

[0021] Figure 4 A schematic diagram of the variable pitch mechanism provided in an embodiment of the present invention. Figure 2 .

[0022] Explanation of reference numerals in the attached figures:

[0023] 1. Main structure; 11. Support frame; 12. Locking casters; 13. Placement platform; 14. Rotating shaft; 15. Demonstration magnetic plate; 16. Anti-fall mat; 2. Limiting mechanism; 21. Limiting pin; 22. Limiting spring; 23. Limiting groove; 3. Variable pitch mechanism; 31. Magnetic base; 32. Mounting column; 33. Fixed end of telescopic rod; 34. Movable end of telescopic rod; 4. Adjusting mechanism; 41. Adjusting groove; 42. Adjusting handle; 43. Adjusting column. Detailed Implementation

[0024] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0025] As attached Figure 1 To be continued Figure 4 As shown:

[0026] Example:

[0027] The present invention provides a two-point distance comparison demonstration device with variable path length, including a main body 1, the main body 1 including a support frame 11, a locking universal wheel 12 and a placement platform 13 provided on the support frame 11, and a demonstration magnetic plate 15 provided on the support frame 11 via a rotating shaft 14.

[0028] It also includes a limiting mechanism 2 for locking the swing angle of the demonstration magnetic plate 15, a pitch-changing mechanism 3 for forming two magnetic attraction points with variable distances on the demonstration magnetic plate 15, and an adjustment mechanism 4 for locking the length adjusted by the pitch-changing mechanism 3.

[0029] The platform 13 is also equipped with a drop protection mat 16, which is located below the demonstration magnetic plate 15. The drop protection mat 16 is made of flexible rubber.

[0030] Specifically, the limiting mechanism 2 includes a limiting pin 21 disposed on the support frame 11, a plurality of limiting grooves 23 disposed on the demonstration magnetic plate 15, and a limiting spring 22 disposed between the limiting pin 21 and the support frame 11.

[0031] Furthermore, multiple limiting grooves 23 are evenly distributed in a semi-circle, and the limiting pins 21 are adapted to the limiting grooves 23, so that the limiting pins 21 can be inserted into the corresponding limiting grooves 23.

[0032] Furthermore, the variable pitch mechanism 3 includes two magnetic seats 31 that are magnetically attracted to the demonstration magnetic plate 15. The magnetic seats 31 are provided with mounting posts 32. The two mounting posts 32 are connected by a telescopic rod, which includes a fixed end 33 and a movable end 34.

[0033] It should be noted that the movable end 34 of the telescopic rod is equipped with scale lines.

[0034] Specifically, the adjustment mechanism 4 includes multiple adjustment slots 41 provided on the movable end 34 of the telescopic rod, and an adjustment handle 42 provided on the mounting post 32 near the movable end 34 of the telescopic rod. The adjustment handle 42 is connected to an adjustment post 43, and the adjustment post 43 is adapted to the adjustment slots 41.

[0035] Among them, multiple adjustment slots 41 are linearly and evenly distributed, and adjustment columns 43 can be inserted into the corresponding adjustment slots 41 through the mounting columns 32.

[0036] Furthermore, a return spring is fitted onto the adjusting column 43.

[0037] Furthermore, the anti-fall pad 16 can prevent the pitch mechanism 3 from falling to the ground when it comes off.

[0038] Working principle: In the initial state, the variable path length two-point distance comparison demonstration device is pushed to the teaching demonstration area by the locking caster 12, and the entire device is fixed to the ground by the self-locking function of the locking caster 12. At this time, the demonstration magnetic plate 15 is in a vertical position under the action of the rotating shaft 14. The limiting pin 21 in the limiting mechanism 2 is inserted into one of the semi-circularly evenly distributed limiting grooves 23 on the back of the demonstration magnetic plate 15 under the elastic force of the limiting spring 22, so that the demonstration magnetic plate 15 remains stable relative to the support frame 11 and does not swing freely. The anti-fall mat 16 is laid on the placement platform 13 and located directly below the demonstration magnetic plate 15, and its flexible rubber material is in a ready state.

[0039] When the teacher needs to demonstrate the comparison of distances between two points at different planar angles, first, the limiting pin 21 is pulled outward to overcome the elastic force of the limiting spring 22 and exit from the current limiting slot 23. At this time, the demonstration magnetic plate 15 is unlocked. The teacher holds the edge of the demonstration magnetic plate 15 and swings it around the support frame 11 to the desired teaching angle, such as a 30-degree or 45-degree tilt, using the pivot 14. After the position is determined, the limiting pin 21 is released, and the limiting spring 22 pushes the limiting pin 21 to automatically insert into the limiting slot 23 corresponding to that angle. With a slight clicking sound, the demonstration magnetic plate 15 is relocked. In this way, the demonstration magnetic plate 15 simulates a virtual projection plane that is different from the horizontal or vertical plane.

[0040] Subsequently, the teacher takes the pitch-changing mechanism 3 and attaches the two magnetic seats 31 to the surface of the demonstration magnetic board 15. Because the demonstration magnetic board 15 is magnetic, the two magnetic seats 31 can be firmly attached to any position on the board surface. The two magnetic seats 31 are connected by a telescopic rod, wherein the fixed end 33 of the telescopic rod is fixedly connected to the mounting post 32 on one magnetic seat 31, and the movable end 34 of the telescopic rod is slidably sleeved with the mounting post 32 on the other magnetic seat 31. In the initial state, the return spring in the adjustment mechanism 4 is compressed, and its elastic force forces the adjustment post 43 to pass through the side wall of the mounting post 32 and insert into one of the adjustment slots 41 opened on the movable end 34 of the telescopic rod. Therefore, the length of the telescopic rod is locked, and the relative distance between the two magnetic seats 31 is fixed.

[0041] When demonstrating the first set of comparative distances, the teacher pulls the adjusting handle 42 near the movable end 34 of the telescopic rod upwards with their finger. The adjusting handle 42 causes the adjusting column 43 to move upwards against the force of the return spring, completely disengaging the end of the adjusting column 43 from the adjusting groove 41. At this point, the movable end 34 of the telescopic rod is unlocked. The teacher then uses their other hand to pull or push the movable end 34 of the telescopic rod, allowing it to slide relative to the fixed end 33, while observing the graduated lines on the movable end 34. When the movable end 34 slides to the desired length, for example, when the distance between the centers of the two magnetic bases 31 is displayed as ten centimeters, the teacher releases the adjusting handle 42. Under the compression force of the return spring, the adjusting column 43 automatically returns downwards and re-inserts into the now aligned adjusting groove 41, accompanied by a clear locking sound, indicating that the length of the telescopic rod is stably locked at ten centimeters. The teacher can then draw a line connecting two points along the side of the telescopic rod on the demonstration magnetic board 15 with chalk or a marker to show the students this straight path.

[0042] When demonstrating the second set of comparative distances, for example, adjusting the distance between the two points to 15 centimeters, the teacher pulls the adjusting handle 42 upwards again to disengage the adjusting column 43 from the adjusting slot 41. After unlocking the telescopic rod, the teacher continues to pull the movable end 34 of the telescopic rod outwards until the scale line displays 15 centimeters. Then, the teacher releases the adjusting handle 42, and the adjusting column 43, driven by the return spring, automatically engages in the corresponding linearly evenly distributed adjusting slot 41 to complete the locking. The teacher can also draw the line connecting the two points at this length.

[0043] If it is necessary to demonstrate the contrast effect under different swing angles, the teacher only needs to follow the aforementioned steps to remove the limiting pin 21 and swing the demonstration magnetic plate 15 to another angle and lock it. At this time, although the actual straight distance between the two magnetic seats 31 on the plate surface has not changed, due to the change in the tilt angle of the plate surface, the visual projection length or spatial orientation of the line connecting the two points relative to the horizontal reference plane will change. The teacher can guide students to observe the visual difference of the same actual distance under different plane angles.

[0044] Throughout the demonstration, even if the teacher accidentally causes the two magnetic bases 31 to detach from the surface of the demonstration magnetic plate 15 while disassembling or adjusting them, the detached magnetic base 31 or telescopic rod will fall directly onto the flexible rubber anti-fall pad 16, be buffered, bounce up or roll a short distance and stop, and will not directly hit the ground or the surface of the platform 13. This effectively avoids damage to the pitch mechanism 3 and eliminates the safety hazards caused by the breakage of magnetic components.

[0045] After the demonstration, the teacher pulls the adjusting handle 42 again to unlock the telescopic rod, pushes the movable end 34 of the telescopic rod back to its shortest retracted state, and then releases the adjusting handle 42 to lock it automatically. Next, the teacher pulls out the limit pin 21 to rotate the demonstration magnetic plate 15 back to the vertical position and relocks it. Finally, the pitch-changing mechanism 3 is removed from the demonstration magnetic plate 15 and stored separately. The entire device is then pushed back to its storage position using the locking casters 12, completing the entire teaching demonstration process.

[0046] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A two-point distance comparison demonstration device with variable path length, characterized in that, Includes a main body (1), which includes a support frame (11), a locking caster wheel (12) and a placement platform (13) on the support frame (11), and a demonstration magnetic plate (15) on the support frame (11) via a pivot (14). It also includes a limiting mechanism (2) for locking the swing angle of the demonstration magnetic plate (15), a pitch-changing mechanism (3) for forming two magnetic attraction points with variable distances on the demonstration magnetic plate (15), and an adjustment mechanism (4) for locking the length adjusted by the pitch-changing mechanism (3).

2. The two-point distance comparison demonstration device with variable path length according to claim 1, characterized in that, The placement platform (13) is also provided with a drop protection mat (16), which is located below the demonstration magnetic plate (15). The drop protection mat (16) is made of flexible rubber.

3. The two-point distance comparison demonstration device with variable path length according to claim 1, characterized in that, The limiting mechanism (2) includes a limiting pin (21) disposed on the support frame (11), a plurality of limiting grooves (23) disposed on the demonstration magnetic plate (15), and a limiting spring (22) disposed between the limiting pin (21) and the support frame (11).

4. The two-point distance comparison demonstration device with variable path length according to claim 3, characterized in that, The multiple limiting grooves (23) are evenly distributed in a semi-circle, and the limiting pins (21) are adapted to the limiting grooves (23). The limiting pins (21) can be inserted into the corresponding limiting grooves (23).

5. The two-point distance comparison demonstration device with variable path length according to claim 1, characterized in that, The variable pitch mechanism (3) includes two magnetic seats (31) magnetically attached to the demonstration magnetic plate (15). The magnetic seats (31) are provided with mounting posts (32). The two mounting posts (32) are connected by a telescopic rod. The telescopic rod includes a fixed end (33) and a movable end (34).

6. The two-point distance comparison demonstration device with variable path length according to claim 5, characterized in that, The telescopic rod has a scale line on its movable end (34).

7. The two-point distance comparison demonstration device with variable path length according to claim 1, characterized in that, The adjustment mechanism (4) includes a plurality of adjustment slots (41) disposed on the movable end (34) of the telescopic rod, and an adjustment handle (42) disposed on the mounting post (32) near the movable end (34) of the telescopic rod. The adjustment handle (42) is connected to an adjustment post (43), and the adjustment post (43) is adapted to the adjustment slots (41).

8. A two-point distance comparison demonstration device with variable path length according to claim 7, characterized in that, The multiple adjustment slots (41) are linearly and evenly distributed, and the adjustment column (43) can be inserted into the corresponding adjustment slot (41) through the mounting column (32).

9. A two-point distance comparison demonstration device with variable path length according to claim 8, characterized in that, A reset spring is fitted on the adjusting column (43).

10. A two-point distance comparison demonstration device with variable path length according to claim 1, characterized in that, The anti-fall pad (16) can prevent the pitch mechanism (3) from falling to the ground when it falls off.

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