Grounding protection device for electrical installation
By designing an electrically installed ground protection device including multiple components, the auxiliary rotor, the outer shaft, the convex key sleeve and the ground rod are used to drive the rotary drilling cone into the soil, and the pressure pushing column is lowered by the raising column and the movable frame to strengthen the auxiliary solid cone, the problem of the easy loosening and skewed electrically installed ground protection device in the prior art is solved, and higher stability and service life are achieved.
Patent Information
- Application Number
- CN202422201599.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-09
- Publication Date
- 2025-06-27
- Estimated Expiration
- 2034-09-09
AI Technical Summary
In the long-term use of existing electrically installed ground protection devices, it is easy to loosen or deflect due to external forces, especially if the connection position between the ground wire and the protector is exposed to the outside, it is easy to loosen due to problems such as accidental contact.
An electrically installed ground protection device including a surface frame, a ground insertion rod, a rotary drill cone, a convex key sleeve, a wire wrap, an outer shaft, an auxiliary rotary frame, a capping disk, a push rod, a sliding seal plate, a movable frame, a height-adjustment column, a pressing column, an auxiliary solid cone, a smooth block and an outer convex plate are designed. The auxiliary rotor and the outer shaft drive the convex key sleeve to drive the ground rod to rotate, drive the rotary drilling cone into the soil, and drive the pressing column down by adjusting the column and the movable frame to push the smooth block to slide to reinforce the auxiliary solid cone, thereby achieving secondary reinforcement of the device.
It effectively solves the problem that the ground wire connection position is exposed to the outside and is prone to loosening easily. The secondary reinforcement measures prevent the device from gradually leaving its original position due to external force, which improves the stability and service life of the device.
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Figure CN223039143U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of engineering technology, in particular to an electrical installation grounding protection device. Background Technique
[0002] Construction engineering refers to the engineering entity formed by the construction of various housing buildings and their ancillary facilities and the installation of supporting lines, pipelines, and equipment. Among them, housing buildings refer to those with roofs, beams, columns, walls, foundations, and that can form internal spaces to meet the needs of people's production, residence, study, and public activities.
[0003] The electrical installation grounding protection device is one of the important tools in the electrical installation of construction engineering. For example, an electrical installation grounding protection device disclosed in the Chinese invention patent application publication specification CN221305022U includes a conductive rod. A connection seat is fixedly installed at the upper end of the conductive rod. Connecting plates are fixedly installed in the middle of both ends of the connection seat. An installation frame is fixedly installed at one end of the connecting plate. A bolt is spirally installed on the installation frame. A fixing structure is arranged inside the conductive rod. The fixing structure includes a rotating block, a connecting rod, a first bearing, a rectangular groove, a first threaded rod, a mounting plate, a second bearing, a rectangular sliding groove, a second threaded rod, a rectangular slider, a first gear, a second gear, a first groove, a fixing block, and a rectangular hole. A rectangular groove is opened near the lower end inside the conductive rod. Mounting plates are fixedly installed on the inner surface of the rectangular groove near the upper and lower ends. The electrical installation grounding protection device of the utility model can increase the stability of the conductive rod, avoid the phenomenon that the conductive rod is easily loosened under the influence of external forces, and the connection with the ground is not firm.
[0004] However, the following defects are found in the above-mentioned prior art solutions during use: If the connection position between the ground wire and the protector is exposed to the outside for a long time, it may become loose due to problems such as accidental contact during subsequent use. And if the protector itself is not properly secondarily reinforced, it will also gradually deviate under the influence of external forces during long-term use and gradually move out of its original position. Content of the Utility Model
[0005] Aiming at the deficiencies of the prior art, the utility model provides an electrical installation grounding protection device, which solves the problems raised in the background technique.
[0006] Technical Solution
[0007] To achieve the above object, the utility model is realized by the following technical solutions: An electrical installation grounding protection device includes a surface frame. The inner surface of the surface frame is threadedly connected with a ground-inserting rod. The inner surface of the ground-inserting rod is fixedly connected with a rotary drill cone. The outer circumferential surface of the rotary drill cone is clamped with a convex key sleeve. The inner surface of the convex key sleeve is threadedly connected with a winding column. The outer surface of the convex key sleeve is slidably connected with the inner wall of the ground-inserting rod. The outer surface of the convex key sleeve on the side away from the rotary drill cone is fixedly connected with a through outer shaft. The outer circumferential surface of the through outer shaft is slidably connected with the inner wall of the ground-inserting rod. The end of the through outer shaft away from the convex key sleeve is fixedly connected with an auxiliary rotating frame. The outer circumferential surface of the through outer shaft is slidably connected with a capping plate. The outer surface of the capping plate on the side close to the rotary drill cone is fixedly connected with a ground-inserting rod. The inner surface of the capping plate is fixedly connected with a pushing rod. The outer circumferential surface of the pushing rod is slidably connected with a sliding sealing plate. The outer surface of the sliding sealing plate is slidably connected with the inner wall of the capping plate. The outer surface of the ground-inserting rod is slidably connected with a synchronous moving frame. The inner surface of the synchronous moving frame is threadedly connected with a height-adjusting column. The lower end of the height-adjusting column is rotatably connected with the surface frame. The inner surface of the synchronous moving frame is fixedly connected with a pressing and pushing column. The outer circumferential surface of the pressing and pushing column is slidably connected with an auxiliary fixing cone. The outer circumferential surface of the auxiliary fixing cone is fixedly connected with the surface frame. The inner surface of the auxiliary fixing cone is slidably connected with a flat slider. The upper surface of the flat slider is clamped with the pressing and pushing column. The outer surface of the flat slider on the side away from the pressing and pushing column is fixedly connected with an outer convex plate. The outer surface of the outer convex plate is slidably connected with the auxiliary fixing cone.
[0008] Further, the surface frame is a rectangular plate. Circular grooves are provided at both ends of the rectangular plate. The inner surface of the circular groove is fixedly connected with an auxiliary fixing cone. Threaded grooves are provided on the outer surface of the rectangular plate. The inner surface of the threaded groove is threadedly connected with a ground-inserting rod. The upper surface of the rectangular plate is rotatably connected with a height-adjusting column.
[0009] Further, the ground-inserting rod is a circular rod. Threaded grooves are provided on the outer surface of the circular rod. The outer surface of the threaded groove is threadedly connected with the surface frame. The upper end of the circular rod is fixedly connected with a capping plate. A circular groove is provided at the upper end of the circular rod. The inner surface of the circular groove is slidably connected with a convex key sleeve. The inner surface of the circular groove is slidably connected with a through outer shaft. A through hole penetrating through to the lower end of the circular rod is provided on the inner wall at the bottom side of the circular groove. The inner surface of the through hole is fixedly connected with a rotary drill cone. Two rectangular grooves are provided on the inner wall of the circular groove. The inner surface of the rectangular groove is slidably connected with a convex key sleeve.
[0010] Further, the rotary drill cone is a circular cone. The outer surface of the circular cone on the side close to the capping plate is fixedly connected with a circular rod. The outer circumferential surface of the circular rod is fixedly connected with a ground-inserting rod. The outer circumferential surface of the circular rod is clamped with a convex key sleeve.
[0011] Further, the convex key sleeve is a circular pile. A circular hole is provided at the upper end of the circular pile. The inner surface of the circular hole is clamped with a rotary drill cone. The outer circumferential surface of the circular pile is slidably connected with the inner wall of the ground-inserting rod. Two square blocks are fixedly connected to the outer circumferential surface of the circular pile. The outer surface of the square block is slidably connected with the inner wall of the ground-inserting rod. A threaded hole is provided on the outer surface of the square block on the side away from the rotary drill cone. The inner surface of the threaded hole is threadedly connected with a winding column.
[0012] Further, the sliding sealing plate is a rectangular plate. The outer surface of the rectangular plate close to the outer through shaft is an arc surface. A square key is fixedly connected to the outer surface of the rectangular plate close to the ground frame side. The inner wall of the capping plate slides on the outer surface of the square key. A circular hole is provided on the outer surface of the square key, and a push rod slides on the inner surface of the circular hole.
[0013] Further, the auxiliary fixing cone is a circular rod. The outer circumferential surface of the circular rod is fixedly connected to the ground frame. The lower end of the circular rod is fixedly connected to a circular cone. A square hole is provided at the upper end of the circular rod, and a pressing push column slides on the inner surface of the square hole. Two rectangular grooves are provided on the inner wall of the square hole, and a flat slider slides on the inner surface of the rectangular groove. A rectangular groove penetrating to the outer circumferential surface of the circular rod is provided on the inner wall of the rectangular groove, and an outer convex plate slides on the inner surface of the rectangular groove.
[0014] The beneficial effects of the present utility model are as follows:
[0015] 1. For this electrical installation grounding protection device, during the rotation of the auxiliary rotating frame, the outer through shaft drives the convex key sleeve to push the grounding rod to rotate. Thus, during the rotation of the grounding rod, the rotary drill cone below it is driven to drill into the soil. When the grounding rod is completely drilled into the soil, press down the auxiliary rotating frame, so that the auxiliary rotating frame drives the convex key sleeve to slide down through the outer through shaft, making the opening of the convex key sleeve engage with the rotary drill cone, thereby fixing the convex key sleeve, achieving the purpose of burying the end point of the ground wire as deep as possible, and solving the problem that the connection position of the ground wire is exposed outside and is prone to looseness.
[0016] 2. For this electrical installation grounding protection device, during the rotation of the height adjustment column, the self-threaded groove drives the synchronous movement frame to descend. During the descent of the synchronous movement frame, the pressing push columns on both sides are driven to descend. Thus, during the descent of the pressing push columns, the lower ends of the pressing push columns push the inclined surfaces of the flat sliders on both sides, causing the flat sliders to slide outwards, so that the flat sliders drive the outer convex plate to push out the auxiliary fixing cone, thereby strengthening the auxiliary fixing cone in the soil, achieving the purpose of secondary reinforcement of the main structure of the device, and solving the problem that the device may gradually deviate from its original position due to external forces if it is too loose. Description of the Drawings
[0017] Figure 1 It is a drawing of the capping plate structure of the present utility model;
[0018] Figure 2 It is a drawing of the grounding rod structure of the present utility model;
[0019] Figure 3 It is a drawing of the rotary drill cone structure of the present utility model;
[0020] Figure 4 It is a drawing of the convex key sleeve structure of the present utility model;
[0021] Figure 5 It is a drawing of the auxiliary fixing cone structure of the present utility model.
[0022] Among them, there are a ground surface frame 1, a ground-inserting rod 2, a rotary drill cone 3, a convex key sleeve 4, a wire-winding column 5, a through outer shaft 6, an auxiliary rotary frame 7, a capping plate 8, a pushing rod 9, a sliding sealing plate 10, a synchronous movement frame 11, a height-adjusting column 12, a pressing and pushing column 13, an auxiliary fixing cone 14, a flat slider 15, and an outer convex plate 16. Specific embodiments
[0023] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.
[0024] Refer to Figures 1-5 , an electrical installation grounding protection device, including a ground surface frame 1. The ground surface frame 1 is a rectangular plate, and circular grooves are provided at both ends of the rectangular plate. An auxiliary fixing cone 14 is fixedly connected to the inner surface of the circular groove. A threaded groove is provided on the outer surface of the rectangular plate, and a ground-inserting rod 2 is threadedly connected to the inner surface of the threaded groove. A height-adjusting column 12 is rotatably connected to the upper surface of the rectangular plate. The ground surface frame 1 is used to provide a necessary working environment for some devices.
[0025] The inner surface of the ground surface frame 1 is threadedly connected to a ground-inserting rod 2. The ground-inserting rod 2 is a circular rod, and a threaded groove is provided on the outer surface of the circular rod. The outer surface of the threaded groove is threadedly connected to the ground surface frame 1. The upper end of the circular rod is fixedly connected to a capping plate 8. A circular groove is provided at the upper end of the circular rod, and a convex key sleeve 4 is slidably connected to the inner surface of the circular groove. A through outer shaft 6 is slidably connected to the inner surface of the circular groove. A through hole penetrating to the lower end of the circular rod is provided on the inner wall of the bottom side of the circular groove, and a rotary drill cone 3 is fixedly connected to the inner surface of the through hole. Two rectangular grooves are provided on the inner wall of the circular groove, and a convex key sleeve 4 is slidably connected to the inner surface of the rectangular groove. The ground-inserting rod 2 is used to drive the devices inside it into the ground by its own rotation.
[0026] The inner surface of the ground-inserting rod 2 is fixedly connected to a rotary drill cone 3. The rotary drill cone 3 is a circular cone. A circular rod is fixedly connected to the outer surface of the circular cone close to the capping plate 8. The outer circumferential surface of the circular rod is fixedly connected to the ground-inserting rod 2. The outer circumferential surface of the circular rod is clamped with a convex key sleeve 4. The rotary drill cone 3 is used to fix the convex key sleeve 4.
[0027] The outer circumferential surface of the rotary drill cone 3 is clamped with a convex key sleeve 4. The convex key sleeve 4 is a circular pile. A circular hole is provided at the upper end of the circular pile, and the rotary drill cone 3 is clamped to the inner surface of the circular hole. The outer circumferential surface of the circular pile is slidably connected to the inner wall of the ground-inserting rod 2. Two square blocks are fixedly connected to the outer circumferential surface of the circular pile, and the outer surfaces of the square blocks are slidably connected to the inner wall of the ground-inserting rod 2. A threaded hole is provided on the outer surface of the square block away from the rotary drill cone 3, and a wire-winding column 5 is threadedly connected to the inner surface of the threaded hole. The convex key sleeve 4 is used to fix the ground wire and drive the ground wire to slide into the ground-inserting rod 2.
[0028] The inner surface of the convex key sleeve 4 is threadedly connected with a wire-winding column 5. The outer surface of the convex key sleeve 4 is slidably connected to the inner wall of the ground-inserting rod 2. The outer surface of the convex key sleeve 4 on the side away from the rotary drill bit 3 is fixedly connected with an outer through shaft 6. The outer circumferential surface of the outer through shaft 6 is slidably connected to the inner wall of the ground-inserting rod 2. One end of the outer through shaft 6 away from the convex key sleeve 4 is fixedly connected with an auxiliary rotating frame 7.
[0029] The outer circumferential surface of the outer through shaft 6 is slidably connected with a sealing top plate 8. The outer surface of the sealing top plate 8 on the side close to the rotary drill bit 3 is fixedly connected with the ground-inserting rod 2. The inner surface of the sealing top plate 8 is fixedly connected with a pushing rod 9. The outer circumferential surface of the pushing rod 9 is slidably connected with a sliding sealing plate 10. The sliding sealing plate 10 is a rectangular plate. The outer surface of the rectangular plate on the side close to the outer through shaft 6 is an arc surface. The outer surface of the rectangular plate on the side close to the ground surface frame 1 is fixedly connected with a square key. The outer surface of the square key is slidably connected to the inner wall of the sealing top plate 8. The outer surface of the square key is provided with a circular hole. The inner surface of the circular hole is slidably connected with the pushing rod 9. The arc surface of the outer surface of the sliding sealing plate 10 is fixedly connected with a waterproof material with a certain plasticity. The sliding sealing plate 10 is used to clamp the ground wire and seal the slot between the sealing top plate 8 and the ground-inserting rod 2.
[0030] The outer surface of the sliding sealing plate 10 is slidably connected to the inner wall of the sealing top plate 8. The outer surface of the ground-inserting rod 2 is slidably connected with a synchronous moving frame 11. The inner surface of the synchronous moving frame 11 is threadedly connected with a height-adjusting column 12. The lower end of the height-adjusting column 12 is rotatably connected to the ground surface frame 1. The inner surface of the synchronous moving frame 11 is fixedly connected with a pressing and pushing column 13. The outer circumferential surface of the pressing and pushing column 13 is slidably connected with an auxiliary fixing cone 14. The auxiliary fixing cone 14 is a circular rod. The outer circumferential surface of the circular rod is fixedly connected with the ground surface frame 1. The lower end of the circular rod is fixedly connected with a circular cone. The upper end of the circular rod is provided with a square hole. The inner surface of the square hole is slidably connected with the pressing and pushing column 13. The inner wall of the square hole is provided with two rectangular grooves. The inner surface of the rectangular grooves is slidably connected with a flat slider 15. The inner wall of the rectangular grooves is provided with a rectangular groove that penetrates to the outer circumferential surface of the circular rod. The inner surface of the rectangular groove is slidably connected with an outer convex plate 16. The auxiliary fixing cone 14 is used to fix the ground surface frame 1 above the ground to prevent the ground surface frame 1 from being pulled out by an external force.
[0031] The outer circumferential surface of the auxiliary fixing cone 14 is fixedly connected with the ground surface frame 1. The inner surface of the auxiliary fixing cone 14 is slidably connected with a flat slider 15. The upper surface of the flat slider 15 is clamped with the pressing and pushing column 13. The outer surface of the flat slider 15 on the side away from the pressing and pushing column 13 is fixedly connected with an outer convex plate 16. The outer surface of the outer convex plate 16 is slidably connected to the auxiliary fixing cone 14.
[0032] In use, insert the rotary drill cone 3 and the auxiliary fixing cone 14 into the ground. Then, drive the height-adjusting column 12 to rotate through an external power source. During the rotation of the height-adjusting column 12, the unison frame 11 is driven to descend through its own thread groove. During the descent of the unison frame 11, the two side pressing and pushing columns 13 are driven to descend, so that the lower end of the pressing and pushing column 13 pushes the inclined surfaces of the two side flat sliders 15 during the descent of the pressing and pushing column 13, causing the flat sliders 15 to slide outwards, so that the flat sliders 15 drive the outer convex plates 16 to push out the auxiliary fixing cone 14, thereby strengthening the auxiliary fixing cone 14 in the soil. After the surface frame 1 is fixed, fix the ground wire on the wire-winding column 5. Then, drive the auxiliary rotating frame 7 to rotate through an external power source, so that the auxiliary rotating frame 7 drives the insertion rod 2 to rotate through the through outer shaft 6 during rotation, so that the insertion rod 2 drives the rotary drill cone 3 below it to drill into the soil during rotation. When the insertion rod 2 is completely drilled into the soil, press down the auxiliary rotating frame 7, so that the auxiliary rotating frame 7 drives the convex key sleeve 4 to slide down through the through outer shaft 6, so that the opening of the convex key sleeve 4 is engaged with the rotary drill cone 3, thereby fixing the convex key sleeve 4, and bury the ground wire as deep as possible. Then, the sliding sealing plate 10 is pushed by the push rod 9, so that the arc surface of the sliding sealing plate 10 squeezes the ground wire, making the ground wire closely adhere to the outside of the insertion rod 2.
[0033] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, making equivalent substitutions or changes, should be covered by the protection scope of the present invention.
Claims
1. An electrical installation grounding protection device, comprising a ground surface frame (1), characterized in that: The inner surface of the surface frame (1) is threadedly connected to a ground rod (2), the inner surface of the ground rod (2) is fixedly connected to a rotary drill cone (3), the outer circumferential surface of the rotary drill cone (3) is clamped with a convex key sleeve (4), the inner surface of the convex key sleeve (4) is threadedly connected to a winding column (5), the outer surface of the convex key sleeve (4) is slidably connected to the inner wall of the ground rod (2), the outer surface of the convex key sleeve (4) away from the rotary drill cone (3) is fixedly connected to an outer shaft (6), the outer circumferential surface of the outer shaft (6) is slidably connected to the inner wall of the ground rod (2), the end of the outer shaft (6) away from the convex key sleeve (4) is fixedly connected to an auxiliary rotating frame (7), the outer circumferential surface of the outer shaft (6) is slidably connected to a capping plate (8), the outer surface of the capping plate (8) close to the rotary drill cone (3) is fixedly connected to the ground rod (2), the inner surface of the capping plate (8) is fixedly connected to a push rod (9), the outer circumferential surface of the push rod (9) The surface is slidably connected with a sliding sealing plate (10), the outer surface of the sliding sealing plate (10) is slidably connected with the inner wall of the capping plate (8), the outer surface of the ground insertion rod (2) is slidably connected with a uniformly movable frame (11), the inner surface of the uniformly movable frame (11) is threadedly connected with a height adjustment column (12), the lower end of the height adjustment column (12) is rotatably connected with the ground surface frame (1), the inner surface of the uniformly movable frame (11) is fixedly connected with a push column (13), the outer surface of the push column (13) is slidably connected with an auxiliary fixing cone (14), the outer circumferential surface of the auxiliary fixing cone (14) is fixedly connected with the ground surface frame (1), the inner surface of the auxiliary fixing cone (14) is slidably connected with a smooth block (15), the upper surface of the smooth block (15) is clamped with the push column (13), the outer surface of the smooth block (15) away from the push column (13) is fixedly connected with an outer convex plate (16), and the outer surface of the outer convex plate (16) is slidably connected with the auxiliary fixing cone (14).
2. An electrical installation grounding protection device according to claim 1, characterized in that: The surface frame (1) is a rectangular plate with circular grooves at both ends, an auxiliary cone (14) fixedly connected to the inner surface of the circular groove, a threaded groove at the outer surface of the rectangular plate, a ground rod (2) threadedly connected to the inner surface of the threaded groove, and a height adjustment column (12) rotatably connected to the upper surface of the rectangular plate.
3. An electrical installation grounding protection device according to claim 1, characterized in that: The ground insertion rod (2) is a circular rod, the outer surface of the circular rod is provided with a threaded groove, the outer surface of the threaded groove is threadedly connected to the surface frame (1), the upper end of the circular rod is fixedly connected to a capping plate (8), the upper end of the circular rod is provided with a circular groove, the inner surface of the circular groove is slidably connected to a convex key sleeve (4), the inner surface of the circular groove is slidably connected to an outer shaft (6), the inner wall of the bottom side of the circular groove is provided with a through hole that passes through to the lower end of the circular rod, the inner surface of the through hole is fixedly connected to a rotary drill cone (3), the inner wall of the circular groove is provided with two rectangular grooves, and the inner surface of the rectangular groove is slidably connected to a convex key sleeve (4).
4. An electrical installation grounding protection device according to claim 1, characterized in that: The rotary drill cone (3) is a circular cone, the outer surface of the circular cone close to the capping plate (8) is fixedly connected to a circular rod, the outer circumferential surface of the circular rod is fixedly connected to a ground insertion rod (2), and the outer circumferential surface of the circular rod is clamped with a convex key sleeve (4).
5. An electrical installation grounding protection device according to claim 1, characterized in that: The convex key sleeve (4) is a circular pile, the upper end of the circular pile is provided with a circular hole, the inner surface of the circular hole is clamped with a rotary drill cone (3), the outer circumferential surface of the circular pile is slidably connected to the inner wall of the ground insertion rod (2), the outer circumferential surface of the circular pile is fixedly connected to two square blocks, the outer surfaces of the square blocks are slidably connected to the inner walls of the ground insertion rod (2), the outer surface of the square blocks away from the rotary drill cone (3) is provided with a threaded hole, and the inner surface of the threaded hole is threadedly connected to a winding column (5).
6. An electrical installation grounding protection device according to claim 1, characterized in that: The sliding sealing plate (10) is a rectangular plate, the outer surface of the rectangular plate close to the outer shaft (6) is an arc surface, the outer surface of the rectangular plate close to the surface frame (1) is fixedly connected to a square key, the outer surface of the square key is slidably connected to the inner wall of the capping plate (8), the outer surface of the square key is provided with a circular hole, and the inner surface of the circular hole is slidably connected to a push rod (9).
7. An electrical installation grounding protection device according to claim 1, characterized in that: The auxiliary fixing cone (14) is a circular rod, the outer circumference of the circular rod is fixedly connected to the surface frame (1), the lower end of the circular rod is fixedly connected to the circular cone, the upper end of the circular rod is provided with a square hole, the inner surface of the square hole is slidably connected to a push column (13), the inner wall of the square hole is provided with two rectangular grooves, the inner surface of the rectangular groove is slidably connected to a smooth block (15), the inner wall of the rectangular groove is provided with a rectangular groove penetrating to the outer circumference of the circular rod, and the inner surface of the rectangular groove is slidably connected to an outer convex plate (16).
Citation Information
Patent Citations
Grounding protection device for electrical installation
CN221305022U