Door lock

Abstract

The utility model relates to the technical field of intelligent door locks, and provides a door lock. The door lock comprises a lock body, a lighting assembly, a light detection module and a controller, wherein an unlocking verification module is arranged on the lock body; the lighting assembly is arranged on the lock body; the light detection module is used for detecting whether indoor and / or outdoor environment light is sufficient or not; the controller is electrically connected with the lighting assembly, the light detection module and the unlocking verification module in a communication mode, and the controller is used for controlling the lighting assembly to emit light when the outdoor environment light is insufficient and the unlocking verification module is triggered, and / or used for controlling the lighting assembly to emit light when the indoor environment light is insufficient and a human body unlocks indoors. According to the door lock, the lighting assembly can emit light when a human body enters the door and turns on the lamp or when the lamp is turned off and goes out, the light condition can be improved, people do not need to walk in the dark, the lighting effect is good, the problems of stumbling or bumping and the like are avoided, and the safety performance is improved.

Description

Technical Field

[0001] This application relates to the field of smart door lock technology, and more particularly to a door lock. Background Technology

[0002] When users return home at night or on cloudy days when there is insufficient light, they have to fumble in the dark to turn on the lights after opening the door. When leaving, they also have to turn off the indoor lights first and then fumble in the dark to unlock the door. When the light switch is far away, there is a long area of ​​poor visibility. This is especially dangerous for the elderly, visually impaired people, pregnant women, and other special groups. They are likely to trip and fall, which poses a safety hazard and results in a poor user experience. Utility Model Content

[0003] In order to solve the above-mentioned technical problems, or at least partially solve the above-mentioned technical problems, this application provides a door lock.

[0004] This application provides a door lock, including:

[0005] A lock body, on which an unlocking verification module is provided;

[0006] Lighting components are provided on the lock body;

[0007] The light detection module is used to detect whether the indoor and / or outdoor ambient light is sufficient;

[0008] The controller is electrically connected to the lighting component, the light detection module, and the unlocking verification module. The controller is used to control the lighting component to emit light when the outdoor ambient light is insufficient and the unlocking verification module is triggered, and / or to control the lighting component to emit light when the indoor ambient light is insufficient and a person unlocks the door indoors.

[0009] The door lock provided in this application includes a lock body, a lighting component, a light detection module, and a controller. The light detection module can detect whether the indoor and / or outdoor ambient light is sufficient and transmit light information to the controller. When the light detection module detects insufficient outdoor light, the controller can control the lighting component to emit light when the user needs to enter the room and turn on the lights after successfully unlocking the door from the outside, thus improving the lighting conditions for entering the room and eliminating the need for the user to fumble in the dark to turn on the lights upon returning home. When the user is preparing to leave in insufficient indoor light, even after turning off the indoor lights, the lighting component can still improve the lighting effect, preventing tripping or bumping into other objects and enhancing safety performance. In cases of insufficient light, the lighting component only emits light after a person has successfully unlocked the door from the outside, or when a person unlocks the door from the inside, or when a person unlocks the door from the inside while simultaneously unlocking the door from the outside. This avoids excessive energy consumption and extends the lifespan of the door.

[0010] In some embodiments, a notch is provided at the bottom of the lock body;

[0011] The light detection module is located inside the lock body, and the light detection module can detect ambient light through the notch;

[0012] And / or, the lighting component is disposed inside the lock body, and at least a portion of the lighting component protrudes from the outer surface of the lock body through the notch and emits lighting light to the outside of the lock body.

[0013] In some embodiments, the lighting assembly includes a housing and a lamp plate disposed on the housing, the lamp plate being electrically connected to the controller, and the housing being disposed on the lock body and rotatably connected to the lock body.

[0014] In some embodiments, at least two sets of positioning mechanisms are provided between the lock body and the housing, and the at least two sets of positioning mechanisms are spaced apart along the rotation direction of the housing, for locking the housing and the lock body when the housing rotates to different positions.

[0015] In some embodiments, the positioning mechanism includes a limiting post, which is disposed on the lock body;

[0016] The outer contour of the shell includes a main body section and a protruding section in sequence along the circumferential direction. The two ends of the main body section are bent outward to form two first limiting grooves on the outer surface. The protruding section is arranged opposite to the main body section, and the two ends of the protruding section are respectively connected to the two ends of the main body section.

[0017] In some embodiments, the positioning mechanism further includes a latch, which is disposed on the main body segment;

[0018] The buckle has a second limiting groove on the side facing away from the main body section. There are two buckles, and they are set one-to-one with the first limiting groove. Each group of positioning mechanisms includes one first limiting groove and the second limiting groove on the opposite side.

[0019] The number of limiting posts is two, and the limiting posts are located between the first limiting groove and the second limiting groove on the same side.

[0020] In some embodiments, the lamp panel is disposed inside the housing and is snap-fitted into the housing;

[0021] An opening is provided on the housing, through which the lamp panel emits illumination light to the outside of the housing.

[0022] In some embodiments, a first card plate and a second card plate are provided on opposite sides inside the housing. The first card plate and the second card plate are spaced apart and a first card slot is formed between the first card plate and the second card plate. The two ends of the lamp plate are respectively limited in the first card slots on both sides.

[0023] In some embodiments, the lighting assembly further includes a light-transmitting cover disposed at the opening and covering the opening, the light-transmitting cover being snap-fitted into the housing.

[0024] In some embodiments, a third retaining plate is provided on each of the opposite sides inside the housing, and a second retaining groove is formed between the opposite sidewalls of the two third retaining plates, and the light-transmitting cover is limited within the second retaining groove;

[0025] The inner wall of the opening extends beyond the opposite side wall of the third plate in a direction toward the center of the opening to form a limiting edge for supporting the light-transmitting cover. Attached Figure Description

[0026] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0027] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 An explosion of a door lock according to an embodiment of this utility model Figure 1 ;

[0029] Figure 2 An explosion of a door lock according to an embodiment of this utility model Figure 2 ;

[0030] Figure 3 This is a schematic diagram of the shell structure according to an embodiment of the present invention;

[0031] Figure 4 This is a structural schematic diagram of the side of the door lock away from the door panel according to an embodiment of the present invention;

[0032] Figure 5 This is a structural schematic diagram of the door lock near the door panel according to an embodiment of the present invention;

[0033] Figure 6 for Figure 5 Enlarged view of part A in the middle;

[0034] Figure 7 This is a schematic diagram of the lighting component of a door lock in one embodiment of the present invention, showing the side away from the door panel after rotation.

[0035] Figure 8 This is a schematic diagram of the lighting component of a door lock according to an embodiment of the present invention, after rotation, on the side closest to the door panel.

[0036] Figure 9 This is a schematic diagram of the door lock installation of an inward-pushing door panel according to an embodiment of the present utility model;

[0037] Figure 10 This is a top view of the inner push-open door panel according to an embodiment of the present utility model;

[0038] Figure 11 This is a schematic diagram of the door lock installation of an external pull-out door panel according to an embodiment of the present utility model;

[0039] Figure 12 This is a top view of an embodiment of the pull-out door panel of this utility model.

[0040] In the diagram: 1. Lock body; 11. Notch; 12. Shaft; 2. Lighting assembly; 21. Housing; 210. Through hole; 211. Main body section; 212. Protruding section; 213. First limiting groove; 214. First slot; 215. First locking plate; 216. Second locking plate; 217. Second slot; 218. Third locking plate; 219. Limiting edge; 22. Light panel; 23. Light-transmitting cover; 3. Positioning mechanism; 31. Limiting post; 32. Buckle; 321. Second limiting groove; 4. Door frame; 5. Door panel. Detailed Implementation

[0041] To better understand the above-mentioned objectives, features, and advantages of this application, the solution of this application will be further described below. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0042] Many specific details are set forth in the following description in order to provide a full understanding of this application, but this application may also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only some embodiments of this application, and not all embodiments.

[0043] The door lock will be described in detail below through specific examples:

[0044] Reference Figures 1 to 12 As shown in the figure, some embodiments of the present invention provide a door lock, including a lock body 1, a lighting component 2, a light detection module, and a controller.

[0045] The lock body 1 is equipped with an unlocking verification module, and the lighting component 2 is installed on the lock body 1. The light detection module is used to detect whether the indoor and / or outdoor ambient light is sufficient. The controller is electrically connected to the lighting component 2, the light detection module, and the unlocking verification module. The controller is used to control the lighting component 2 to emit light when the outdoor ambient light is insufficient and the unlocking verification module is triggered, and / or to control the lighting component 2 to emit light when the indoor ambient light is insufficient and a person unlocks the lock indoors.

[0046] In practice, the light detection module can detect whether the ambient light is sufficient and transmit the light information to the controller. When the light detection module detects insufficient outdoor light, and the user needs to turn on the lights indoors after successfully unlocking the door outdoors, the controller can control the lighting component 2 to emit light, improving the lighting conditions for turning on the lights indoors. This way, the user does not need to fumble in the dark to turn on the lights after returning home. The controller is also used to control the lighting component 2 to emit light when the light detection module detects insufficient indoor light and a person unlocks the door indoors. With this setting, when the user is about to leave in insufficient indoor light, even if the indoor lights are turned off, the lighting component 2 can still improve the lighting effect, avoiding tripping or bumping into things, thus improving safety performance. When the light is insufficient, the lighting component 2 will only emit light after a person has successfully unlocked the door outdoors, or when a person unlocks the door indoors to leave, or when a person unlocks the door indoors while the unlocking verification module is being verified outdoors. This can avoid consuming too much power and extend its service life.

[0047] Specifically, a human position detection module, such as an infrared detection module, can be installed on the side of the door lock facing inwards. After setting a distance threshold, the system can predict whether the user needs to unlock the door and leave based on the distance between the user and the door lock. The controller can then control whether the lighting component 2 illuminates. With this setup, even if the user turns off the lights, if the user's position exceeds the distance threshold, it will not be considered that the user needs to unlock the door and leave. In this case, the lighting component 2 will not illuminate, thus avoiding excessive energy consumption.

[0048] It should be noted that the detection of whether the ambient light is sufficient, whether the person is about to leave the house, and whether the door unlocking verification is successful can be combined and arranged in any way. This application does not limit this and can be set according to actual needs.

[0049] In specific implementation, refer to Figure 1 and Figure 2 As shown, the lock body 1 includes a panel and a base plate. The base plate is mounted on the door, the panel is mounted on the base plate, and the unlocking verification module is mounted on the panel. Specifically, the unlocking verification module is a keypad or a camera for facial recognition.

[0050] It should be noted that the illumination time of the lighting component 2 can be adjusted by the user, such as 15 seconds, 25 seconds, 35 seconds, etc. When the lighting component 2 illuminates for the set time, it can be automatically turned off by the controller.

[0051] In some embodiments, a notch 11 is provided at the bottom of the lock body 1, and the lighting component 2 is disposed inside the lock body 1. At least a portion of the lighting component 2 protrudes from the outer surface of the lock body 1 through the notch 11 and emits illumination light to the outside of the lock body 1. It is understood that the lighting component 2 being disposed inside the lock body 1 can improve the overall appearance of the door lock. At the same time, at least a portion of the lighting component 2 protrudes from the outer surface of the lock body 1 through the notch 11, and the illumination light emitted by the lighting component 2 can be emitted from inside the lock body 1 to the outside through the notch 11 to meet the lighting requirements for turning on the light.

[0052] The light detection module is located inside the lock body 1, and it can detect ambient light through the notch 11. In other words, both the lighting component 2 and the light detection module are located inside the lock body 1, which ensures the aesthetic appearance of the door lock, and allows ambient light to enter the lock body 1 through the notch 11, so that the light detection module can detect the ambient light.

[0053] In some embodiments, refer to Figure 2 and Figure 3 As shown, the lighting assembly 2 includes a housing 21 and a lamp panel 22 mounted on the housing 21. The lamp panel 22 is electrically connected to the controller, and the housing 21 is mounted on the lock body 1 and rotatably connected to the lock body 1. That is, the housing 21 can rotate relative to the lock body 1, thereby causing the lamp panel 22 on the housing 21 to rotate relative to the lock body 1. This allows the illumination angle of the light emitted by the lamp panel 22 to be adjusted according to usage requirements, further improving the lighting conditions when the lights are turned on indoors.

[0054] In a specific implementation, a through hole 210 is provided on the housing 21, and a rotating shaft 12 is provided on the lock body 1. The rotating shaft 12 passes through the through hole 210, so that the housing 21 can rotate and cooperate with the lock body 1 with the rotating shaft 12 as the axis, thereby driving the lamp plate 22 to rotate and cooperate with the lock body 1 with the rotating shaft 12 as the axis.

[0055] Of course, it should be noted that the housing 21 can also be rotated with the lock body 1 in other ways. This application does not limit this, as long as the lamp plate 22 can be rotated relative to the lock body 1 to adjust the illumination angle of the illumination light emitted by the lamp plate 22.

[0056] In some embodiments, at least two sets of positioning mechanisms 3 are provided between the lock body 1 and the housing 21. The at least two sets of positioning mechanisms 3 are spaced apart along the rotation direction of the housing 21, and are used to lock the housing 21 and the lock body 1 when the housing 21 rotates to different positions.

[0057] In other words, at least two sets of positioning mechanisms 3 correspond to at least two rotational positions of housing 21. During rotation, housing 21 can be locked in a fixed position under the action of positioning mechanism 3, thereby limiting the illumination angle of lamp panel 22. At the same time, it can also prevent housing 21 from retracting into lock body 1 due to excessive rotation, which would cause light obstruction. This setting can ensure the light output angle of lighting component 2, thereby ensuring the illumination effect of lighting component 2 and ensuring user safety.

[0058] In specific implementation, the positioning mechanism 3 includes a limiting post 31, which is set on the lock body 1; the outer contour of the housing 21 includes a main body section 211 and a protruding section 212 in sequence along the circumferential direction. The two ends of the main body section 211 are bent outward to form two first limiting grooves 213 on the outer surface, that is, the two ends of the main body section 211 form two first limiting grooves 213. The protruding section 212 is arranged opposite to the main body section 211, and the two ends of the protruding section 212 are respectively connected to the two ends of the main body section 211. The two ends of the main body section 211 are the ends of the first limiting grooves 213 away from the main body section 211. After the main body section 211, the first limiting grooves 213 and the protruding section 212 are connected in sequence, the outer contour of the housing 21 can form a complete contour.

[0059] Reference Figure 5 and Figure 6 As shown, both the main body segment 211 and the protruding segment 212 are formed as arc segments, and their centers coincide. There is a height difference between the main body segment 211 and the protruding segment 212 in the radial direction of the shell 21, and the distance from the protruding segment 212 to the center of the shell 21 is greater than the distance from the main body segment 211 to the center of the shell 21, that is, the radius of the protruding segment 212 is greater than the radius of the main body segment 211.

[0060] It should be noted that the lamp panel 22 can emit illumination light outward through the raised section 212. The raised section 212 has a large emission area, which can improve the lighting effect of the lighting component 2.

[0061] In some embodiments, the positioning mechanism 3 further includes a buckle 32, which is disposed on the main body section 211. A second limiting groove 321 is formed on the side of the buckle 32 facing away from the main body section 211. There are two buckles 32, which are configured one-to-one with the first limiting groove 213. Each group of positioning mechanisms 3 includes a first limiting groove 213 and a second limiting groove 321 on the opposite side.

[0062] There are two limiting posts 31. The limiting posts 31 are located between the first limiting groove 213 and the second limiting groove 321 on the same side. During the rotation of the housing 21, the limiting posts 31 can switch between abutting the first limiting groove 213 and the second limiting groove 321 on the opposite side to limit the rotation angle of the housing 21.

[0063] In other words, the first limiting groove 213, the limiting post 31, and the second limiting groove 321 on the same side are spaced apart along the circumferential direction. When the first limiting groove 213 moves toward the limiting post 31 along with the housing 21, the limiting post 31 can cooperate with the first limiting groove 213 to limit the position. When the first limiting groove 213 moves away from the limiting post 31, the buckle 32 and the second limiting groove 321 move toward the limiting post 31, and the housing 21 can also be limited by the buckle 32.

[0064] Specifically, the shape of the limiting post 31 is adapted to the first limiting groove 213 and the second limiting groove 321, and the limiting post 31 can be locked in the first limiting groove 213 or the second limiting groove 321, so as to prevent the lighting component 2 from changing the set illumination angle due to impact and vibration during the opening and closing of the door, so as to further lock the housing 21 and the lock body 1.

[0065] The first limiting groove 213 and the limiting post 31, and the second limiting groove 321 and the limiting post 31 can be interference fit.

[0066] In some embodiments, refer to Figure 3 As shown, the lamp plate 22 is disposed inside the housing 21 to protect the lamp plate 22 and ensure the service life of the lamp plate 22. The lamp plate 22 is snapped into the housing 21, thereby fixing the lamp plate 22 inside the housing 21, so that the lamp plate 22 can rotate relative to the lock body 1 with the housing 21.

[0067] Specifically, the housing 21 has an opening, and the light panel 22 emits illumination light to the outside of the housing 21 through the opening, so that the illumination light can be emitted through the notch 11 on the lock body 1, so as to avoid the user having to fumble in the dark to turn on the light.

[0068] In a specific implementation, a first card plate 215 and a second card plate 216 are provided on opposite sides inside the housing 21. The first card plate 215 and the second card plate 216 are spaced apart, and a first card groove 214 is formed between the first card plate 215 and the second card plate 216. The two ends of the lamp plate 22 are respectively limited in the first card groove 214 on both sides.

[0069] Understandably, referring to Figure 2 and Figure 3 As shown, the lamp plate 22 includes a plate body and lamp beads disposed on the plate body. The lamp beads are used to emit illumination light. The plate body is engaged with the first slot 214, that is, the plate body can be supported between the first slot 215 and the second slot 216, thereby fixing the lamp beads inside the housing 21 so that the lamp plate 22 can rotate with the housing 21 to change the illumination angle.

[0070] Of course, it should be noted that the lamp plate 22 can also be connected to the housing 21 through other structures. This application does not limit this, as long as the lamp plate 22 can be fixed inside the housing 21, so that the lamp plate 22 can rotate relative to the lock body 1 along with the housing 21.

[0071] In some embodiments, the lighting assembly 2 further includes a light-transmitting cover 23, which is disposed at the opening and covers the opening. It is understood that the light-transmitting cover 23 is disposed at the opening position, and the illumination light emitted by the lamp panel 22 can be diffused to the outside of the housing 21 through the light-transmitting cover 23.

[0072] Specifically, the light-transmitting cover 23 is snapped into the housing 21 to fix the light-transmitting cover 23 onto the housing 21, thus ensuring the light transmission effect.

[0073] In specific implementation, refer to Figure 3 As shown, a third retaining plate 218 is provided on each of the opposite sides inside the housing 21. A second retaining groove 217 is formed between the opposite sidewalls of the two third retaining plates 218, and the light-transmitting cover 23 is limited within the second retaining groove 217. That is, the two sides of the light-transmitting cover 23 abut against the opposite sidewalls of the two third retaining plates 218, thereby limiting the light-transmitting cover 23 within the second retaining groove 217.

[0074] Furthermore, the inner wall of the opening extends beyond the opposite side wall of the third retaining plate 218 in the direction toward the center of the opening to form a limiting edge 219 for supporting the light-transmitting cover 23. That is, the limiting edge 219 can prevent the light-transmitting cover 23 from detaching from the housing 21, thus ensuring the connection stability of the light-transmitting cover 23.

[0075] For example, both the light-transmitting cover 23 and the third clamping plate 218 are arc-shaped structures, and their centers coincide and their radii are the same. When the two ends of the light-transmitting cover 23 abut against the third clamping plate 218 on the corresponding side, the light-transmitting cover 23 is limited and cannot move toward the center. At the same time, in the direction away from the center, the limiting plate can also serve as a limiting structure to support the light-transmitting cover 23 and prevent the light-transmitting cover 23 from moving away from the center. With this configuration, the light-transmitting cover 23 can be fixed on the housing 21 and rotate with the housing 21, resulting in high connection stability.

[0076] It should be noted that, referring to Figures 9 to 12 As shown, door locks are installed on both sides of the door. For both inward and outward opening methods, the lighting component 2 should be installed on at least one side facing the door frame 4 after the door is opened, so that it can emit light into the room when the door is open, providing good lighting conditions for the user to turn on the lights. Of course, lighting components 2 can also be installed on both lock bodies 1 on both sides of the door, depending on the actual needs.

[0077] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes the element.

[0078] The above are merely specific embodiments of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to these embodiments, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A door lock, characterized in that, include: A lock body, on which an unlocking verification module is provided; A lighting assembly is provided on the lock body; The light detection module is used to detect whether the indoor and / or outdoor ambient light is sufficient; The controller is electrically connected to the lighting component, the light detection module, and the unlocking verification module. The controller is used to control the lighting component to emit light when the outdoor ambient light is insufficient and the unlocking verification module is triggered, and / or to control the lighting component to emit light when the indoor ambient light is insufficient and a person unlocks the door indoors.

2. The door lock according to claim 1, characterized in that, The bottom of the lock body is provided with a notch; The light detection module is located inside the lock body, and the light detection module can detect ambient light through the notch; And / or, the lighting component is disposed inside the lock body, and at least a portion of the lighting component protrudes from the outer surface of the lock body through the notch and emits lighting light to the outside of the lock body.

3. The door lock according to claim 1, characterized in that, The lighting assembly includes a housing and a lamp plate disposed on the housing. The lamp plate is electrically connected to the controller. The housing is disposed on the lock body and is rotatably connected to the lock body.

4. The door lock according to claim 3, characterized in that, At least two sets of positioning mechanisms are provided between the lock body and the housing. The at least two sets of positioning mechanisms are spaced apart along the rotation direction of the housing, and are used to lock the housing and the lock body when the housing rotates to different positions.

5. The door lock according to claim 4, characterized in that, The positioning mechanism includes a limiting post, which is disposed on the lock body; The outer contour of the shell includes a main body section and a protruding section in sequence along the circumferential direction. The two ends of the main body section are bent outward to form two first limiting grooves on the outer surface. The protruding section is arranged opposite to the main body section, and the two ends of the protruding section are respectively connected to the two ends of the main body section.

6. The door lock according to claim 5, characterized in that, The positioning mechanism also includes a latch, which is disposed on the main body section; The buckle has a second limiting groove on the side facing away from the main body section. There are two buckles, and they are set one-to-one with the first limiting groove. Each group of positioning mechanisms includes one first limiting groove and the second limiting groove on the opposite side. The number of limiting posts is two, and the limiting posts are located between the first limiting groove and the second limiting groove on the same side.

7. The door lock according to claim 3, characterized in that, The lamp panel is disposed inside the housing and is snapped into the housing; An opening is provided on the housing, and the lamp panel emits illumination light to the outside of the housing through the opening.

8. The door lock according to claim 7, characterized in that, The housing has a first card plate and a second card plate on opposite sides. The first card plate and the second card plate are spaced apart and form a first card slot between the first card plate and the second card plate. The two ends of the lamp plate are respectively limited in the first card slot on both sides.

9. The door lock according to claim 7, characterized in that, The lighting assembly also includes a light-transmitting cover, which is disposed at the opening and covers the opening, and the light-transmitting cover is snap-fitted into the housing.

10. The door lock according to claim 9, characterized in that, The housing has a third retaining plate on each of its opposite sides, and a second retaining groove is formed between the opposite sidewalls of the two third retaining plates. The light-transmitting cover is limited within the second retaining groove. The inner wall of the opening extends beyond the opposite side wall of the third plate in a direction toward the center of the opening to form a limiting edge for supporting the light-transmitting cover.

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