Elastic shell ejection principle teaching model
By designing a simplified teaching model for the principle of elastic shell ejection, and utilizing the interaction of components such as the limiting plate and the motion plate, the dynamic process of shell ejection is accurately reproduced. This solves the problems of complex structure and inconvenient operation of traditional models, and improves the intuitive teaching effect.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-29
- Publication Date
- 2026-04-03
AI Technical Summary
Traditional firearm ejection principle teaching models are complex in structure and inconvenient to operate, making it difficult to intuitively demonstrate the ejection process, which leads to students' difficulty in understanding and poor teaching results.
A teaching model for the principle of elastic ejection is designed. Through the clever combination of components such as limiting plate, motion plate, and front plate, the model simulates the elastic deformation interaction between spring and protrusion and the barrel groove, accurately reproduces the ejection dynamics process, sets reasonable gaps and adapts to the shape of the cartridge case, simplifies the structure and enhances intuitiveness.
It reduces the difficulty of understanding the shell-exploding principle, improves teaching effectiveness and accuracy, enhances the stability and ease of operation of the model, is applicable to various teaching scenarios, and improves students' learning interest and efficiency.
Smart Images
Figure CN224082120U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of teaching aids, and in particular to a teaching model based on the principle of elastic shell ejection. Background Technology
[0002] In the field of firearms principles instruction, the ejection principle, as a key aspect of firearm operation, is crucial for understanding the overall working mechanism of firearms. However, traditional teaching methods have many limitations in explaining the ejection principle.
[0003] On the one hand, most teaching relies solely on theoretical explanations, such as using textual descriptions and static two-dimensional drawings, making it difficult for students to mentally construct the dynamic, three-dimensional structure of the ejection process. Students find it difficult to understand the coordinated motion relationships between the ejector hook, spring, cartridge case, and other components during ejection, resulting in poor learning outcomes and a superficial grasp of the knowledge, failing to deeply understand the core principles of ejection.
[0004] On the other hand, existing teaching models for the ejection principle suffer from structural complexity and inconvenience in operation. Some models, in pursuit of a high degree of realism in replicating the structure of firearms, are overly intricate and complex in design. This not only results in high production costs but also makes it difficult for students to grasp the key structures and principles of motion during demonstrations, as the numerous components can easily distract them. Furthermore, the complex structure increases the difficulty of operation, requiring teachers to spend a significant amount of time preparing and operating the equipment, thus impacting teaching efficiency.
[0005] Furthermore, some teaching models, while relatively simple in structure, are not intuitive or accurate enough in simulating ejection. For example, they fail to clearly demonstrate how the extractor hook engages with the ejection slot, or how the spring provides the power to achieve the ejection action. This leads to misunderstandings among students regarding the ejection principle and hinders the improvement of teaching quality.
[0006] In conclusion, developing a teaching model that is simple in structure, easy to operate, and can intuitively and accurately demonstrate the principle of elastic ejection is of great practical significance. It can effectively make up for the shortcomings of existing teaching methods and models and improve the effectiveness of firearms principle teaching. Utility Model Content
[0007] The purpose of this invention is to provide a teaching model for the principle of elastic ejection. This invention is not only simple in structure and low in cost, but also not limited by the location of use. Furthermore, it transforms abstract theoretical knowledge into a concrete, visual process. Through the elastic deformation interaction between the spring and protrusion (simulating the ejector) and the bore groove (simulating the bore or bolt), it accurately reproduces the ejection dynamics of a real firearm, helping students to quickly understand the process. It is better suited for various teaching scenarios and improves teaching effectiveness.
[0008] The technical solution of this utility model is as follows: A teaching model for the principle of elastic ejection, set on a base plate, characterized in that: the teaching model includes a limiting plate fixed on the base plate, a sliding groove in the middle of the limiting plate, a moving plate slidably arranged in the sliding groove, a bottom edge groove at the front of the moving plate, an extractor hook on one side of the bottom edge groove, a spring groove on the other side of the bottom edge groove, a spring in the spring groove, and a protrusion connected to the tail end of the spring; a front plate is set at the front of the moving plate, and the front plate is fixed on the base plate; a chamber groove is opened in the front plate, the chamber groove and the bottom edge groove are spliced to form a cartridge case groove, a cartridge case is placed in the cartridge case groove, the cartridge case body is accommodated in the chamber groove, the bottom edge of the cartridge case is accommodated in the bottom edge groove and abuts against the protrusion, and the ejection groove at the bottom of the cartridge case fits with the extractor hook; the limiting plate and the front plate have ejection notches on one side of the extractor hook.
[0009] In the aforementioned teaching model of the elastic shell ejection principle, the hook angle of the shell-pulling hook is a right-angled rectangle, the ejection groove is a right-angled rectangle, and the hook angle matches the ejection groove; the hook tip of the shell-pulling hook is a flat angle and fits against the tail end of the front plate; the hook surface of the shell-pulling hook is an inclined surface and is tangent to the tip of the ejection groove.
[0010] In the aforementioned teaching model of the elastic ejection principle, an ejection gap is provided between the bottom edge groove and the bottom edge; a rotation gap is provided between the ejection shell and the limiting plate and the front plate.
[0011] In the aforementioned teaching model of the elastic shell ejection principle, the protrusion is frustum-shaped, with the area of the bottom of the frustum being larger than the area of the top of the frustum, and the bottom of the frustum protruding from the spring groove and abutting against the bottom edge, while the top of the frustum is fixed inside the spring.
[0012] In the aforementioned teaching model of the elastic ejection principle, the barrel groove is narrow at the front and wide at the back to match the shape of the cartridge case. The barrel groove is provided with a ramp that matches the shoulder of the cartridge case, and the barrel groove has a sliding allowance for the cartridge case.
[0013] In the aforementioned teaching model of the elastic shell ejection principle, the limiting plate includes an upper limiting plate and a lower limiting plate, which are fixed to the base plate in an H-shape by a connecting plate and a fixing pin.
[0014] In the aforementioned teaching model of the elastic shell ejection principle, the upper limit plate is connected to the upper tail end of the front plate.
[0015] In the aforementioned teaching model of the elastic shell ejection principle, the end of the motion board is provided with a motion handle, which is a long rectangle and narrower than the motion board.
[0016] In the aforementioned teaching model of the elastic shell ejection principle, the limiting plate and the front plate are both fixed to the base plate by fixing pins.
[0017] Compared with the prior art, the present invention has the following advantages:
[0018] 1. The structural design is reasonable and facilitates understanding of the ejection principle: This teaching model of the elastic ejection principle presents the complex ejection process in an intuitive way through its ingenious structural design. By interacting with the elastic deformation of the spring and protrusion (simulating the ejector) and the chamber groove (simulating the chamber or bolt), the dynamics of ejection in real firearms are accurately reproduced. The various components, such as the limiting plate, the moving plate, and the front plate, work together to clearly show the movement path of the cartridge case within the ejection groove. For example, the right-angled rectangular fit between the extractor and the ejection groove, and the structure where the extractor's tip fits against the rear end of the front plate and its surface is tangent to the tip of the ejection groove, allow students to clearly observe the extractor's gripping and force application during ejection. This greatly reduces the difficulty of understanding the ejection principle, helps students master the relevant knowledge, and improves teaching effectiveness.
[0019] 2. Reasonable gaps are provided to simulate realistic ejection: The ejection gap between the bottom rim groove and the bottom rim, as well as the rotational gap between the cartridge case and the limiting plate and front plate, make the movement of the cartridge case during ejection more realistic. These gaps ensure that the cartridge case can move and rotate smoothly during ejection, and also allow students to visually observe the relative motion relationships between various components during ejection. This enhances the realism of the teaching model and the teaching effect, helping students better understand the mechanical principles and motion laws of actual firearm ejection.
[0020] 3. Adapts to cartridge case shape for precise ejection simulation: The bore groove is narrow at the front and wide at the back, with an internal ramp that matches the cartridge case shoulder, and also allows for sliding clearance. This design perfectly matches the cartridge case shape. During simulated ejection, it accurately demonstrates the cartridge case's positioning and movement within the bore, as well as the forces acting on it during ejection. This allows students to more accurately understand the cartridge case's trajectory within the firearm and the source of its ejection force, improving the accuracy and professionalism of teaching.
[0021] 4. Secure component connections ensure model stability: The limiting plates, including an upper and lower limiting plate, are H-shaped and fixed to the base plate via connecting plates and fixing pins. Both the limiting plates and the front plate are also fixed to the base plate using fixing pins. This robust connection method prevents the teaching model from easily shaking or being damaged during use, ensuring model stability, guaranteeing smooth demonstrations, improving the durability and reliability of the teaching model, and reducing maintenance costs.
[0022] 5. Simple operation and improved teaching efficiency: The long rectangular handle at the end of the motion board is narrower than the board itself, making it easy for operators to hold and push the board to simulate the shell-throwing action. Teachers and students can easily operate the model to quickly demonstrate the shell-throwing process, saving teaching time and improving teaching efficiency. It also allows students to operate the model themselves, enhancing their understanding and memory of the shell-throwing principle, and further increasing their interest and initiative in learning. Attached Figure Description
[0023] Figure 1 This is a structural schematic diagram of the present invention in the state of awaiting shell removal;
[0024] Figure 2 This is a schematic diagram of the structure of this utility model in the state of bolt ejection;
[0025] Figure 3 This is a magnified view of the part awaiting shell ejection.
[0026] Figure 4 This is a magnified view of the bolt ejection state.
[0027] The markings in the attached diagram are as follows: 101-base plate, 102-fixed pin, 111-limiting plate, 112-slide groove, 201-moving plate, 202-extractor hook, 203-bottom edge groove, 204-spring groove, 205-moving handle, 206-spring, 207-protrusion, 209-cassette groove, 213-ejection gap, 214-rotation gap, 301-upper limit plate, 302-lower limit plate, 303-ejection notch, 304-connecting plate, 401-bore groove, 402-cassette, 404-front plate, 408-sliding allowance. Detailed Implementation
[0028] The present invention will be further described below with reference to the accompanying drawings and embodiments, but this should not be construed as limiting the present invention.
[0029] Example: A teaching model for the principle of elastic shell ejection, consisting of the following: Figure 1-4As shown, a drawing board is set on the base plate 101. The base plate 101 is preferably made of wood. Wood drawing boards are lightweight and easy to cut and carve. Compared with metal plates and acrylic plates, wood base plates (such as basswood plywood or birchwood) are lighter, making them easier to handle and transport. Wood can be quickly processed using hand tools (such as carving knives and saws) or laser cutting machines, flexibly adapting to the adjustment needs of complex model structures. In addition, wood drawing boards have high stability and flatness. High-quality wood drawing boards are pressed, resulting in a smooth surface without warping, providing a stable foundation for the model and avoiding component misalignment caused by uneven base plates. Furthermore, wood that has undergone drying treatment has a low risk of deformation under constant temperature and humidity conditions, making it suitable for models that need to be stored for a long time. Moreover, wood is a natural resource. Compared to plastic, it is more environmentally friendly, conforms to the concept of green design, and has a smaller impact on the environment even after disposal, making it suitable for projects that emphasize sustainability. A limiting plate 111 fixed to the base plate 101 has a groove 112 in the middle, within which a moving plate 201 is embedded. The moving plate 201 is rectangular in shape, with a moving handle 205 at its tail end. The moving handle 205 is a long rectangle, narrower than the moving plate 201. The gap between the limiting plate 111 and the moving handle 205 allows operators to easily grip and push the moving plate 201 to simulate shell ejection. Teachers or students can easily operate the model and quickly demonstrate the shell ejection process, saving teaching time and improving teaching efficiency. It also facilitates hands-on operation for students, enhancing their understanding of the process. Understanding and memorizing the shell ejection principle further enhances students' interest and initiative in learning. The front of the motion board 201 has a bottom edge groove 203, with a shell-pulling hook 202 on one side and a spring groove 204 on the other. A suitable spring 206 is housed within the spring groove 204. A protrusion 207, shaped like a frustum, is connected to the tail end of the spring 206. The area of the base of the frustum is larger than the area of the top, and the bottom protrudes from the spring groove 204, contacting the bottom edge. The area of the protrusion 207 contacting the top of the bottom edge is slightly larger than the area contacting the spring 206, effectively dispersing local pressure, avoiding stress concentration, and reducing the risk of material damage. The top of the frustum of the protrusion 207 is fixed to the spring... The spring 206 is used to make it move with the spring 206; a front plate 404 is provided at the front of the moving plate 201, and the front plate 404 is fixed on the base plate 101. A chamber groove 401 is opened in the front plate 404. The chamber groove 401 is narrow at the front and wide at the back and has a ramp that matches the shoulder of the cartridge case 402. A sliding allowance 408 is also reserved. This design is adapted to the shape and height of the cartridge case 402, so that the cartridge case 402 can only slide horizontally within the sliding allowance 408. During the simulated ejection process, the positioning and movement of the cartridge case 402 in the chamber groove 401 and the force situation during ejection can be accurately demonstrated, so that students can more accurately understand the trajectory of the cartridge case inside the firearm and the source of power for ejection, thereby improving the accuracy and professionalism of teaching.The chamber groove 401 and the rim groove 203 are joined to form a cartridge case groove 209. A cartridge case 402 is placed inside the cartridge case groove 209. The shell of the cartridge case 402 is accommodated within the chamber groove 401, and the rim of the cartridge case 402 is accommodated within the rim groove 203, restricting the range of motion of the cartridge case 402. The ejection groove at the bottom of the cartridge case 402 is an inwardly recessed rectangle that matches the extractor hook 202. The limiting plate 111 and the front plate 404 have an ejection notch 303 on one side of the extractor hook 202, which allows the cartridge case 402 to pass through. The limiting plate 111 and the front plate 404 are both fixed to the base plate 101 by fixing pins 102. The moving plate 201 and the cartridge case 402 slide on the base plate 101. Multiple models are fixed to the base plate 101 by the fixing pins 102. The fixing pins 102 are preferably thumbtacks, which are convenient, precise, inexpensive, and non-destructive. They can be directly inserted and used, and can be easily removed and repositioned. They are also suitable for various materials and do not leave permanent marks like glue or screws that would damage the base plate or model parts. The models fixed to the base plate 101 are preferably made of corrugated cardboard. Corrugated cardboard is inexpensive and economical, requiring only scissors, a utility knife, and glue. Furthermore, corrugated cardboard is mostly made from recycled paper, and can be completely recycled or biodegradable after disposal, conforming to green design principles. It can also be used to transform discarded cardboard boxes into models, reducing material waste and raising students' environmental awareness.
[0030] like Figure 2 As shown, the limiting plate 111 includes an upper limiting plate 301 and a lower limiting plate 302, which are fixed to the base plate 101 in an H-shape by a connecting plate 304 and fixing pins 102. Both the limiting plate 111 and the front plate 404 are fixed to the base plate 101 by fixing pins 102, enhancing the stability of the upper and lower limiting plates 301 and 302, effectively resisting rotational torque or bending deformation. This stable connection method makes the teaching model less prone to shaking or damage during use, ensuring the stability of the model, guaranteeing the smooth progress of the demonstration process, improving the durability and reliability of the teaching model, and reducing maintenance costs. The upper limiting plate 301 is connected to the upper tail end of the front plate 404.
[0031] like Figure 2-3As shown, the hook angle of the extractor hook 202 is a right-angled rectangle, and the ejection groove is a concave right-angled rectangle. The hook angle matches the ejection groove, securing the cartridge case 402 to the extractor hook 202. The hook tip of the extractor hook 202 is a flat angle, which matches the side section of the front plate 404. The hook surface of the extractor hook 202 is an inclined plane, which is tangent to the tip of the ejection groove, leaving space for the cartridge case 402 to move at the front end of the ejection groove and at the front plate 404. This allows students to clearly observe the way the extractor hook 202 grabs the cartridge case and applies force during the ejection process, greatly reducing the difficulty of understanding the ejection principle and helping students to master the relevant knowledge in depth, thus improving the teaching effect. An ejection gap 213 is provided between the bottom edge groove 203 and the bottom edge, and a rotation gap 214 is provided between the cartridge case 402 and the limiting plate 111 and the front plate 404. All of these provide the necessary space for the movement of the cartridge case 402, making the movement of the cartridge case 402 during the ejection process closer to the real situation. These gaps ensure that the cartridge case 402 can move and rotate smoothly during ejection, and also allow students to visually observe the relative motion relationships between the components during ejection. This enhances the realism and effectiveness of the teaching model and helps students better understand the mechanical principles and motion laws involved in the actual firearm ejection process. The bore groove 401, which is narrower at the front and wider at the back, is adapted to the shape of the cartridge case 402. A ramp is provided inside the bore groove 401, which matches the shoulder of the cartridge case 402, limiting the amount of the cartridge case 402's tip entering the bore groove 401. Furthermore, a sliding allowance 408 is provided within the bore groove 401 for the cartridge case 402. This design is highly compatible with the shape of the cartridge case 402. During simulated ejection, the model accurately demonstrates the positioning and movement of the cartridge case 402 within the bore groove 401, as well as the forces acting on it during ejection. This allows students to more accurately understand the trajectory of the cartridge case inside the firearm and the source of its ejection power, improving the accuracy and professionalism of the teaching.
[0032] When the teaching model is in the ejection state, the extractor 202 is engaged with the ejection slot. At the same time, the protrusion 207 and the spring 206 together increase the pressure on the bottom edge, thereby holding the cartridge case 402 in place and fixing it in the cartridge case slot 209. When the teaching model is in the bolt ejection state, the actuator 205 moves the actuator plate 201 backward, and the extractor 202 also engages the ejection slot and moves backward. At the same time, the protrusion 207 and the spring 206 together reduce the pressure on the cartridge case slot 209. When the cartridge case 402 leaves the front plate 404, the pressure reaches the minimum value. The spring 206 is fully released, causing the protrusion 207 to push the cartridge case 402 forward. Because the extractor 202 is engaged with the ejection slot, under the simultaneous action of the protrusion 207 and the extractor 202, the cartridge case 402 is ejected after completely leaving the cartridge case slot 209, accurately replicating the ejection dynamics of a real firearm.
[0033] In summary, this utility model is not only simple in structure and low in cost, but also not limited by the place of use. It can transform abstract theoretical knowledge into a concrete and visual process. Through the elastic deformation interaction between the spring and the protrusion (simulating the ejector) and the barrel groove (simulating the barrel or bolt), it accurately reproduces the ejection dynamics of real firearms, helping students to understand quickly. It is better suited to various teaching scenarios, improves teaching effectiveness and quality, and fills the gap in traditional theoretical courses that lack dynamic demonstration tools.
Claims
1. A teaching model for the principle of elastic shell ejection, set on a base plate (101), characterized in that: The teaching model includes a limiting plate (111) fixed on a base plate (101). A groove (112) is provided in the middle of the limiting plate (111), and a moving plate (201) is slidably disposed within the groove (112). The moving plate (201) has a bottom edge groove (203) at its front. A pull hook (202) is provided on one side of the bottom edge groove (203), and a spring groove (204) is provided on the other side. A spring (206) is disposed within the spring groove (204), and a protrusion (207) is connected to the tail end of the spring (206). A front plate (404) is provided at the front of the moving plate (201). Fixed on the base plate (101); the front plate (404) has a chamber groove (401) in it, the chamber groove (401) and the bottom edge groove (203) are spliced to form a cartridge case groove (209), a cartridge case (402) is provided in the cartridge case groove (209), the body of the cartridge case (402) is accommodated in the chamber groove (401), the bottom edge of the cartridge case (402) is accommodated in the bottom edge groove (203) and abuts against the protrusion (207), the ejection groove of the cartridge case (402) fits with the extractor (202); the limiting plate (111) and the front plate (404) have an ejection notch (303) on one side of the extractor (202).
2. The teaching model for the principle of elastic shell ejection according to claim 1, characterized in that: The hook angle of the shell-pulling hook (202) is a right-angled rectangle, and the shell-throwing groove is a right-angled rectangle. The hook angle matches the shell-throwing groove. The hook tip of the shell-pulling hook (202) is a flat angle and fits against the tail end of the front plate (404). The hook surface of the shell-pulling hook (202) is an inclined surface and is tangent to the tip of the shell-throwing groove.
3. The teaching model for the principle of elastic shell ejection according to claim 1, characterized in that: The bottom edge groove (203) is provided with a shell ejection gap (213) between it and the bottom edge; the shell (402) is provided with a rotation gap (214) between it and the limiting plate (111) and the front plate (404).
4. The teaching model for the principle of elastic shell ejection according to claim 1, characterized in that: The protrusion (207) is frustum-shaped, with the area of the bottom of the frustum being larger than the area of the top of the frustum. The bottom of the frustum protrudes from the spring groove (204) and abuts against the bottom edge. The top of the frustum of the protrusion (207) is fixed inside the spring (206).
5. The teaching model for the principle of elastic shell ejection according to claim 1, characterized in that: The chamber groove (401) is narrow at the front and wide at the back, which is adapted to the shape of the cartridge case (402). The chamber groove (401) is provided with a ramp, which is adapted to the shoulder of the cartridge case (402). The chamber groove (401) also has a sliding allowance (408) for the cartridge case (402).
6. The teaching model for the principle of elastic shell ejection according to claim 3, characterized in that: The limiting plate (111) includes an upper limiting plate (301) and a lower limiting plate (302), which are fixed to the base plate (101) in an H-shape by a connecting plate (304) and a fixing pin (102).
7. The teaching model for the principle of elastic shell ejection according to claim 6, characterized in that: The upper limit plate (301) is connected to the upper tail end of the front plate (404).
8. The teaching model for the principle of elastic shell ejection according to claim 1, characterized in that: The end of the motion plate (201) is provided with a motion handle (205), which is a long rectangle and narrower than the motion plate (201).
9. The teaching model for the principle of elastic shell ejection according to any one of claims 1-8, characterized in that: The limiting plate (111) and the front plate (404) are both fixed to the base plate (101) by fixing pins (102).