Controller protective cover fixing and rotating mechanical structure
Through the combined structure of spring post pin and elastic lock tongue buckle, the existing controller protective cover is solved, and the simple and reliable fixing and rotation of the protective cover is achieved, reducing costs and simplifying the installation process.
Patent Information
- Application Number
- CN202421664267.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-15
- Publication Date
- 2025-07-29
- Estimated Expiration
- 2034-07-15
AI Technical Summary
The existing controller protective cover has complex structure, high cost and easy to stumble, making it difficult to achieve simple and reliable fixing and rotation functions.
The combined structure of spring post pin and elastic lock tongue buckle is adopted. The spring post pin provides the rotation shaft function. The elastic lock tongue buckle slides in the lock cavity structure and realizes self-locking through the limit structure and the slot structure, simplifying the installation and snapping process of the protective cover.
It realizes the simple and reliable fixing and rotation of the protective cover, reduces costs, is easy to install, has a more efficient structure and is easier to use.
Smart Images
Figure CN223168497U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of controller devices, and specifically, to a fixing and rotating mechanical structure for a controller protective cover. Background Art
[0002] Currently, general controllers usually have a liquid crystal display screen for human-computer interaction. When the liquid crystal display screen does not need to be operated, in order to prevent the liquid crystal display screen from being damaged, a protective cover that can cover the front side of the liquid crystal display screen is usually installed on the controller housing. The existing protective covers generally have one side connected to one side of the controller housing by a hinge structure to achieve rotation, and the other side is fixed to the other side of the controller housing through a lock tongue structure or a lock buckle structure. However, the traditional lock tongue structure or lock buckle structure is usually composed of multiple components, with a complex structure, high cost, and is also prone to jamming.
[0003] In order to solve the above problems, people have been seeking an ideal technical solution. Summary of the Invention
[0004] The purpose of the utility model is to overcome the deficiencies of the prior art, and thus provide a fixing and rotating mechanical structure for a controller protective cover.
[0005] To achieve the above purpose, the technical solution adopted by the utility model is: a fixing and rotating mechanical structure for a controller protective cover, which is used to install and fasten a protective cover on a housing to cover a liquid crystal display screen, and includes a spring stud and an elastic lock tongue buckle;
[0006] The spring stud is vertically connected between the left side frame of the protective cover and the left side frame of the housing, and is used to rotatably connect the left side frame of the protective cover to the front side of the left side frame of the housing;
[0007] A lock cavity structure with an open right side is provided on the right side frame of the protective cover. The elastic lock tongue buckle is embedded and installed in the lock cavity structure and slides left and right in the lock cavity structure. A return spring that presses the elastic lock tongue buckle to the right is arranged in the lock cavity structure. A limiting structure for limiting the left and right extreme positions of the elastic lock tongue buckle is arranged on the lock cavity structure. The right end of the elastic lock tongue buckle is a lock tongue structure and extends out of the right side of the lock cavity structure. A slot structure that is matched and clamped with the lock tongue structure of the elastic lock tongue buckle is provided on the front side of the right side frame of the housing.
[0008] Based on the above, a rotating handle is integrally formed on the left side frame of the protective cover. First positioning pin holes that are adapted to the columnar structure of the spring stud are respectively opened in the upper and lower parts of the rotating handle. A handle groove that is adapted to the shape of the rotating handle is arranged on the left side frame of the housing. The rotating handle is correspondingly fitted in the handle groove. Second positioning pin holes that are adapted to the pin body structure of the spring stud are respectively opened in the upper and lower parts of the handle groove. The first positioning pin holes and the second positioning pin holes are vertically corresponding;
[0009] There are two spring dowel pins symmetrically arranged up and down. The cylinder structure of the upper spring dowel pin is correspondingly embedded in the upper first positioning pin hole, and the pin body structure of the upper spring dowel pin is correspondingly embedded in the upper second positioning pin hole. The cylinder structure of the lower spring dowel pin is correspondingly embedded in the lower first positioning pin hole, and the pin body structure of the lower spring dowel pin is correspondingly embedded in the lower second positioning pin hole.
[0010] Based on the above, the lock cavity structure includes a square cavity integrally formed in the middle of the right side frame of the protective cover with an open right side. In the middle of the front side wall at the right end of the square cavity, there is an activity avoidance groove with a right side opening for the movement of the lock tongue structure. In the middle of the square cavity, a guide cylinder is integrally formed. The guide cylinder divides the inner cavity of the square cavity into an upper square cavity, a middle cylindrical cavity, and a lower square cavity. On the middle right side of the upper and lower side walls of the square cavity, limit holes are opened in the left-right direction. The upper limit hole communicates with the upper square cavity, and the lower limit hole communicates with the lower square cavity. The two limit holes constitute the limit structure.
[0011] Based on the above, the elastic lock tongue buckle includes the lock tongue structure. The lock tongue structure is vertically arranged with its arc surface at the rear side, the tip of the lock tongue structure is at its right side, and elastic buckles are integrally formed on both the upper and lower parts of the left side surface of the lock tongue structure. The two elastic buckles have the same structure and are symmetrically arranged up and down. The upper elastic buckle is a hook-shaped buckle bent to the upper right with an open right side. In the middle of the left side surface of the lock tongue structure, a positioning guide post located between the two elastic buckles is integrally formed. The positioning guide post is a stepped post with a thinner left side and a thicker right side.
[0012] The upper elastic buckle is correspondingly inserted into the upper square cavity. The upper hook part of the upper elastic buckle is correspondingly slidably clamped in the upper limit hole and protrudes out of the upper limit hole. The lower elastic buckle is correspondingly inserted into the lower square cavity. The lower hook part of the lower elastic buckle is correspondingly slidably clamped in the lower limit hole and protrudes out of the lower limit hole. The positioning guide post is correspondingly coaxially inserted into the middle cylindrical cavity. The return spring is sleeved on the thinner left column of the positioning guide post. The two ends of the return spring respectively press against the bottom of the middle cylindrical cavity and the step of the positioning guide post. The lock tongue structure is located on the right side of the right port of the square cavity.
[0013] Based on the above, the card slot structure includes a square slot opened in the middle of the front side of the right side frame of the housing and matching the contour of the square cavity. Along the vertical direction, a retaining slot is opened near the bottom of the right inner wall of the square slot. The housing forms a retaining block structure above the retaining slot. When the protective cover is fully buckled on the housing, the square cavity is correspondingly embedded in the square slot, and the lock tongue structure is embedded in the retaining slot and blocked by the retaining block structure.
[0014] Based on the above, a offside groove corresponding to the lock tongue structure up and down is provided in the middle of the upper side of the stopper structure. There are chamfer structures between the left side surface of the stopper structure between the offside groove and the retaining groove and the upper side surface and the lower side surface. A handle corresponding to the movable avoidance groove is integrally formed on the left side of the front side surface of the lock tongue structure.
[0015] Based on the above, the handle is an L-shaped plate bent to the right. The front side plate of the handle is placed on the front side of the lock tongue structure and corresponds to the offside groove. When the protective plate is completely buckled on the outer shell, the front side plate of the handle is correspondingly placed in the offside groove.
[0016] Based on the above, the outer shell and the elastic lock tongue buckle are made of engineering plastics, and the protective cover is made of transparent engineering plastics.
[0017] The utility model has substantial features and progress compared with the prior art. Specifically, the utility model provides a rotating shaft function for the protective cover to rotate on the outer shell by a spring stud. At the same time, a lock cavity structure for installing an elastic locking tongue buckle is arranged on the protective cover. The lock cavity structure is mainly composed of a square cavity integrally formed in the middle of the right side frame of the protective cover and open on the right side. The inside of the square cavity is divided into an upper square cavity, a middle cylindrical cavity and a lower square cavity by a guide cylinder. Limiting holes are opened in the middle right side of the upper side wall and the lower side wall of the square cavity along the left-right direction. The elastic locking tongue buckle is mainly composed of a locking tongue structure, two elastic buckles and a positioning guide post. When installing the elastic locking tongue buckle, the return spring can be first sleeved on the thin column of the positioning guide post, and then the positioning guide post is pressed into the middle cylindrical cavity. The corresponding two elastic buckles are respectively pressed into the upper square cavity and the lower square cavity. Then, the hooks of the two elastic buckles move closer to the middle when crossing the right port of the square cavity until the hooks of the two elastic buckles are completely pressed into the square cavity and are correspondingly located at the limiting holes. Then, the hooks of the two elastic buckles rebound and open outward under the elastic action and are respectively clamped into the two limiting holes. In this way, the elastic locking tongue buckle is embedded and slidably installed in the lock cavity structure. Moreover, the outer shell and the elastic locking tongue buckle are made of engineering plastics, and the protective cover is made of transparent engineering plastics, effectively utilizing the elasticity of the plastic parts to realize the self-locking function of the elastic locking tongue buckle. The structure is simple, the installation is convenient, and the cost is low. At the same time, a slot structure matched with the locking tongue structure is arranged on the outer shell. When the protective cover is buckled, the locking tongue structure is squeezed by the block structure at the slot structure and moves to the left. Then, the positioning guide post compresses the return spring to the left. At the same time, the two elastic buckles slide to the left in the two limiting holes respectively. After the locking tongue structure crosses the block structure, the return spring resets and pushes the positioning guide post to move to the right. The locking tongue structure then embeds into the retaining slot to the right and is blocked by the block structure, fixing the protective cover on the outer shell and locking it to complete the buckling of the protective cover and the outer shell. When it is necessary to open the protective cover, only need to push the elastic locking tongue buckle to the left through the handle to compress the return spring. When the locking tongue structure crosses the block structure, it can be flipped forward to open the protective cover, and then the liquid crystal display screen can be operated. Compared with the similar products on the current market, the utility model is simpler to use, more effective and reliable in structure. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 is an exploded schematic view of the utility model Figure 1 .
[0019] Figure 2 is an exploded schematic view of the utility model Figure 2 .
[0020] Figure 3 is an exploded schematic view of the utility model Figure 3 .
[0021] Figure 4It is a schematic diagram of the elastic lock tongue buckle of the present utility model installed in the lock cavity structure.
[0022] Figure 5 It is a schematic diagram of the cooperation between the elastic lock tongue buckle and the card slot structure when the protective cover of the present utility model is buckled on the outer shell.
[0023] In the figure: 1. Protective cover; 2. Outer shell; 3. Spring stud pin; 4. Return spring; 5. Rotating handle; 6. First positioning pin hole; 7. Second positioning pin hole; 8. Square cavity; 9. Movable avoidance groove; 10. Upper square cavity; 11. Middle cylindrical cavity; 12. Lower square cavity; 13. Limit hole; 14. Lock tongue structure; 15. Elastic buckle; 16. Positioning guide post; 17. Square groove; 18. Stop groove; 19. Stop block structure; 20. Overrun groove; 21. Chamfer structure; 22. Handle. Specific embodiments
[0024] The technical solutions of the present utility model will be further described in detail below through specific embodiments.
[0025] As Figure 1-5 shown, a controller protective cover fixing and rotating mechanical structure is used to install and buckle the protective cover 1 on the outer shell 2 to cover the liquid crystal display screen, and includes a spring stud pin 3 and an elastic lock tongue buckle;
[0026] The spring stud pin 3 is vertically connected between the left side frame of the protective cover 1 and the left side frame of the outer shell 2, and is used to rotatably connect the left side frame of the protective cover 1 to the front side of the left side frame of the outer shell 2;
[0027] The right side frame of the protective cover 1 is provided with a lock cavity structure with an open right side. The elastic lock tongue buckle is embedded and installed in the lock cavity structure and slides left and right in the lock cavity structure. A return spring 4 that presses the elastic lock tongue buckle to the right is arranged in the lock cavity structure. A limit structure for restricting the left and right extreme positions of the elastic lock tongue buckle is arranged on the lock cavity structure. The right end of the elastic lock tongue buckle is a lock tongue structure 14 and extends out of the right side of the lock cavity structure. A card slot structure matching the lock tongue structure 14 of the elastic lock tongue buckle is provided on the front side of the right side frame of the outer shell 2.
[0028] In this embodiment, a rotating handle 5 is integrally formed on the left side frame of the protective cover 1. First positioning pin holes 6 adapted to the columnar structure of the spring stud pin 3 are respectively opened in the upper and lower parts of the rotating handle 5. A handle groove adapted to the shape of the rotating handle 5 is arranged on the left side frame of the outer shell 2. The rotating handle 5 is correspondingly fitted in the handle groove. Second positioning pin holes 7 adapted to the pin body structure of the spring stud pin 3 are respectively opened in the upper and lower parts of the handle groove. The first positioning pin holes 6 and the second positioning pin holes 7 are vertically corresponding;
[0029] There are two spring dowel pins 3 symmetrically arranged up and down. The cylindrical structure of the upper spring dowel pin 3 is correspondingly embedded in the upper first positioning pin hole 6, and the pin body structure of the upper spring dowel pin 3 is correspondingly embedded in the upper second positioning pin hole 7. The cylindrical structure of the lower spring dowel pin 3 is correspondingly embedded in the lower first positioning pin hole 6, and the pin body structure of the lower spring dowel pin 3 is correspondingly embedded in the lower second positioning pin hole 7. In this way, the protective cover 1 is rotatably connected to the housing 2 with the spring dowel pin 3 as the rotation axis. The spring dowel pin 3 is simple to install and the connection structure is reliable.
[0030] In this embodiment, the lock cavity structure includes a square cavity 8 integrally formed in the middle of the right side frame of the protective cover 1 and open on the right side. In the middle of the front side wall at the right end of the square cavity 8, there is an activity avoidance groove 9 with a right side opening and used for the movement of the lock tongue structure 14. In the middle of the square cavity 8, a guide cylinder is integrally formed. The guide cylinder divides the inner cavity of the square cavity 8 into an upper square cavity 10, a middle cylindrical cavity 11, and a lower square cavity 12. In the middle of the right side of the upper side wall and the lower side wall of the square cavity 8, limit holes 13 are opened in the left-right direction. The upper limit hole 13 communicates with the upper square cavity 10, and the lower limit hole 13 communicates with the lower square cavity 12. The two limit holes 13 constitute the limit structure.
[0031] In this embodiment, the elastic lock tongue buckle includes the lock tongue structure 14. The lock tongue structure 14 is vertically arranged with its arc surface on the rear side, the tip of the lock tongue structure 14 is on its right side, and elastic buckles 15 are integrally formed on both the upper and lower parts of the left side surface of the lock tongue structure 14. The two elastic buckles 15 have the same structure and are symmetrically arranged up and down. The upper elastic buckle 15 is a hook-shaped buckle bent to the upper right and open on the right side. In the middle of the left side surface of the lock tongue structure 14, a positioning guide post 16 located between the two elastic buckles 15 is integrally formed. The positioning guide post 16 is a stepped post with a thinner left side and a thicker right side.
[0032] The upper elastic buckle 15 is correspondingly inserted into the upper square cavity 10, and the upper hook part of the upper elastic buckle 15 is correspondingly slidably clamped in the upper limit hole 13 and protrudes out of the upper limit hole 13. The lower elastic buckle 15 is correspondingly inserted into the lower square cavity 12, and the lower hook part of the lower elastic buckle 15 is correspondingly slidably clamped in the lower limit hole 13 and protrudes out of the lower limit hole 13. The positioning guide post 16 is correspondingly coaxially inserted into the middle cylindrical cavity 11. The return spring 4 is sleeved on the thinner left column of the positioning guide post 16. The two ends of the return spring 4 respectively press against the bottom of the middle cylindrical cavity 11 and the step of the positioning guide post 16. The lock tongue structure 14 is located on the right side of the right port of the square cavity 8.
[0033] In this embodiment, the card slot structure includes a square groove 17 formed in the middle of the front side of the right side frame of the outer shell 2 and matching the contour of the square cavity 8. A retaining groove 18 is vertically formed in the inner wall of the right side of the square groove 17 near the bottom of the groove. The outer shell 2 forms a retaining block structure 19 above the retaining groove 18. When the protective cover 1 is fully buckled on the outer shell 2, the square cavity 8 is correspondingly fitted into the square groove 17, and the locking tongue structure 14 is embedded in the retaining groove 18 and blocked by the retaining block structure 19.
[0034] In this embodiment, a displacement slot 20 corresponding to the locking tongue structure 14 up and down is provided in the middle of the upper side of the retaining block structure 19. Chamfer structures 21 are provided between the left side surface and the upper and lower side surfaces of the retaining block structure 19 between the displacement slot 20 and the retaining groove 18. A handle 22 corresponding to the movable avoidance groove 9 is integrally formed on the left side of the front side surface of the locking tongue structure 14. The setting of the chamfer structure 21 enables the locking tongue structure 14 to cross the retaining block structure 19 more smoothly.
[0035] In this embodiment, the handle 22 is an L-shaped plate bent to the right. The front side plate of the handle 22 is placed on the front side of the locking tongue structure 14 and corresponds to the displacement slot 20. When the protective plate is fully buckled on the outer shell 2, the front side plate of the handle 22 is correspondingly placed in the displacement slot 20. The handle 22 can move left and right between the displacement slot 20 and the movable avoidance groove 9, so that when the protective cover 1 is buckled on the outer shell 2 or when the protective cover 1 needs to be opened, the locking tongue structure 14 can move left and right to be embedded in or withdrawn from the retaining groove 18.
[0036] In this embodiment, the outer shell 2 and the elastic locking tongue buckle are made of engineering plastics, and the protective cover 1 is made of transparent engineering plastics, with low manufacturing cost. The use of transparent engineering plastics for the protective cover 1 enables it to have a visualization function. Therefore, it can ensure that when the protective cover 1 is buckled on the outer shell 2 under normal circumstances, it can not only protect the liquid crystal display screen but also not affect the observation of the liquid crystal display screen.
[0037] The working principle of this embodiment is as follows: When the protective cover 1 is buckled, the locking tongue structure 14 will move leftward under the extrusion of the retaining block structure 19 at the card slot structure, then the positioning guide post 16 compresses the return spring 4 leftward, and at the same time, the two elastic buckles 15 slide leftward in the two limit holes 13 respectively. After the locking tongue structure 14 crosses the retaining block structure 19, the return spring 4 resets and pushes the positioning guide post 16 to move rightward, and the locking tongue structure 14 then moves rightward and is embedded in the retaining groove 18 and blocked by the retaining block structure 19, so that the protective cover 1 is fixed on the outer shell 2 and locked, completing the buckling of the protective cover 1 and the outer shell 2. When the protective cover 1 needs to be opened, just push the elastic locking tongue buckle leftward through the handle 22 to compress the return spring 4. When the locking tongue structure 14 crosses the retaining block structure 19, flip it forward to open the protective cover 1, and then the liquid crystal display screen can be operated.
[0038] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model and not to limit it; although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the specific implementation methods of the utility model can still be modified or some technical features can be replaced by equivalents; without departing from the spirit of the technical solution of the utility model, they should all be included in the scope of the technical solution for which protection is requested in the utility model.
Claims
1. A fixing and rotating mechanical structure for a controller protective cover, which is used to install and fasten the protective cover on a housing to cover a liquid crystal display screen, and is characterized in that: It includes spring dowel pins and elastic lock tongue fasteners; The spring dowel pins are vertically connected between the left side frame of the protective cover and the left side frame of the housing, and are used to rotatably connect the left side frame of the protective cover to the front side of the left side frame of the housing; The right side frame of the protective cover is provided with a lock cavity structure with an open right side. The elastic lock tongue fastener is embedded and installed in the lock cavity structure and slides left and right in the lock cavity structure. A return spring for pressing the elastic lock tongue fastener to the right is arranged in the lock cavity structure. A limiting structure for restricting the left and right extreme positions of the elastic lock tongue fastener is arranged on the lock cavity structure. The right end of the elastic lock tongue fastener is a lock tongue structure and extends out of the right side of the lock cavity structure. A slot structure matching and clamping with the lock tongue structure of the elastic lock tongue fastener is arranged on the front side of the right side frame of the housing.
2. The controller protective cover fixing and rotating mechanical structure according to claim 1, wherein: A rotating handle is integrally formed on the left side frame of the protective cover. First positioning pin holes adapted to the columnar structure of the spring dowel pins are opened in the upper and lower parts of the rotating handle. A handle groove adapted to the shape of the rotating handle is arranged on the left side frame of the housing. The rotating handle is correspondingly fitted in the handle groove. Second positioning pin holes adapted to the pin body structure of the spring dowel pins are opened in the upper and lower parts of the handle groove. The first positioning pin holes and the second positioning pin holes are vertically corresponding; Two spring dowel pins are symmetrically arranged up and down. The columnar structure of the upper spring dowel pin is correspondingly embedded in the upper first positioning pin hole, and the pin body structure of the upper spring dowel pin is correspondingly embedded in the upper second positioning pin hole. The columnar structure of the lower spring dowel pin is correspondingly embedded in the lower first positioning pin hole, and the pin body structure of the lower spring dowel pin is correspondingly embedded in the lower second positioning pin hole.
3. The controller protection cover fixing and rotating mechanical structure according to claim 1, characterized in that: The lock cavity structure includes a square cavity integrally formed in the middle of the right side frame of the protective cover and with an open right side. A movable avoidance groove with a right side opening and for the movement of the lock tongue structure is opened in the middle of the front side wall at the right end of the square cavity. A guiding cylinder is integrally formed in the middle of the square cavity. The guiding cylinder divides the inner cavity of the square cavity into an upper square cavity, a middle cylindrical cavity and a lower square cavity. Limiting holes are opened in the middle right side of the upper side wall and the lower side wall of the square cavity along the left-right direction. The upper limiting hole communicates with the upper square cavity, and the lower limiting hole communicates with the lower square cavity. The two limiting holes constitute the limiting structure.
4. The controller protective cover fixing and rotating mechanical structure according to claim 3, characterized in that: The elastic lock tongue fastener includes the lock tongue structure. The lock tongue structure is vertically arranged and its arc surface is located at its rear side. The tip of the lock tongue structure is located at its right side. Elastic fasteners are integrally formed on the upper and lower parts of the left side surface of the lock tongue structure. The two elastic fasteners have the same structure and are symmetrically arranged up and down. The upper elastic fastener is a hook-shaped buckle bent to the upper right and with an open right side. A positioning guiding column located between the two elastic fasteners is integrally formed in the middle of the left side surface of the lock tongue structure. The positioning guiding column is a stepped column with a thinner left side and a thicker right side; The elastic buckle on the upper side is correspondingly inserted into the upper square cavity. The upper hook part of the elastic buckle on the upper side is correspondingly slidably clamped in the upper limiting hole and protrudes out of the upper limiting hole. The elastic buckle on the lower side is correspondingly inserted into the lower square cavity. The lower hook part of the elastic buckle on the lower side is correspondingly slidably clamped in the lower limiting hole and protrudes out of the lower limiting hole. The positioning guide post is correspondingly coaxially inserted into the middle cylindrical cavity. The return spring is sleeved on the thin column on the left side of the positioning guide post. The two ends of the return spring respectively press against the bottom of the middle cylindrical cavity and the step of the positioning guide post. The lock tongue structure is located on the right side of the right port of the square cavity.
5. The controller protection cover fixing and rotating mechanical structure according to claim 4, characterized in that: The card slot structure includes a square groove opened in the middle of the front side of the right side frame of the housing and matching the contour of the square cavity. A retaining groove is vertically opened on the inner wall on the right side of the square groove near the groove bottom. The housing forms a retaining block structure above the retaining groove. When the protective cover is completely buckled on the housing, the square cavity is correspondingly fitted into the square groove, and the lock tongue structure is embedded in the retaining groove and blocked by the retaining block structure.
6. The controller protective cover fixing and rotating mechanical structure according to claim 5, characterized in that: A displacement groove corresponding to the lock tongue structure up and down is provided in the middle of the upper side of the retaining block structure. Chamfer structures are provided between the left side surface and the upper and lower side surfaces of the retaining block structure between the displacement groove and the retaining groove. An integrally formed handle corresponding to the movable avoidance groove is provided on the left side of the front side surface of the lock tongue structure.
7. The controller protective cover fixing and rotating mechanical structure according to claim 6, characterized in that: The handle is an L-shaped plate bent to the right. The front side plate of the handle is placed on the front side of the lock tongue structure and corresponds to the displacement groove. When the protective plate is completely buckled on the housing, the front side plate of the handle is correspondingly placed in the displacement groove.
8. The controller protective cover fixing and rotating mechanical structure according to any one of claims 1-7, characterized in that: The housing and the elastic lock tongue buckle are made of engineering plastics, and the protective cover is made of transparent engineering plastics.