A retractable temporary security inspection well cover

Abstract

This invention relates to a retractable temporary safety manhole cover. The manhole cover unit includes a manhole body and a cover body. An expansion plate is slidably inserted into the inside of the cover body. A cylinder is fixedly installed at the bottom of the expansion plate. A volute-shaped plate is slidably fitted onto the outer wall of the cylinder. A base plate is fixedly installed at the bottom of the volute-shaped plate. The locking unit includes a locking disc and a rotating handle. The locking disc is fixedly installed on the top of the cover body. A rod is slidably inserted into the inside of the rotating handle. A second spring is sleeved on the outer wall of the rod. A handle is fixedly installed at the top of the rod. In use, the cover body is first placed on the manhole body. Then, by pulling out the rod and rotating the handle, the handle drives the base plate and the volute-shaped plate to rotate, thereby causing the cylinder and the expansion plate to expand outward. This completes the installation of the manhole cover. The retractable expansion plate allows the cover body to be placed on manholes of different sizes, making it more widely applicable. The rubber plate limits movement and prevents the cover body from shaking.

Description

Technical Field

[0001] This invention relates to the field of temporary manhole cover technology, specifically to a retractable and highly stable temporary safety manhole cover, which is particularly suitable for temporary protection when manhole covers are missing in municipal engineering projects. It can adapt to manholes of different sizes and has high stability. Background Technology

[0002] During safety inspections inside wells, well covers may sometimes be lost. In such cases, temporary well covers are needed to prevent pedestrians or vehicle wheels from falling into the well.

[0003] Existing temporary manhole covers used during safety inspections generally lack adjustable size, making them unsuitable for manholes of varying sizes. Temporary covers may be too small to fit, or too large to be stable. For example, patent document (CN207512781U) discloses a municipal safety manhole cover, which uses a load-bearing plate to replace the stolen cover. However, this technology only passively addresses the issue of missing covers, lacking the ability to actively adjust to different manhole sizes. Furthermore, the load-bearing plate's support structure relies on telescopic rods and springs, which are prone to stability degradation due to spring fatigue over time, failing to meet the demands of rapid adaptation and high stability for temporary covers. Patent document (CN220888728U) discloses a manhole cover anti-theft device that uses a locking rod, locking groove, and alarm cover for security. However, this device has a complex structure, primarily targeting fixed manhole covers, making installation and disassembly inconvenient for temporary use, and it cannot be adjusted according to manhole size, resulting in poor adaptability.

[0004] Therefore, there is an urgent need for a retractable, highly stable, and adaptable temporary safety manhole cover. Summary of the Invention

[0005] This invention proposes a retractable temporary safety manhole cover, which aims to solve the aforementioned technical problems.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A retractable temporary safety manhole cover includes a cover unit and a locking unit.

[0008] The manhole cover unit includes a manhole body and a manhole cover body. An expansion plate is slidably inserted inside the manhole cover body. The expansion plate can adapt to manhole bodies of different sizes by extending and retracting. A cylinder is fixedly installed at the bottom of the expansion plate. A volute is slidably fitted on the outer wall of the cylinder. A base plate is fixedly installed at the bottom of the volute.

[0009] The locking unit includes a locking disc and a rotating handle. The locking disc is fixedly installed on the top of the manhole cover body. A rod is slidably inserted into the inside of the rotating handle. A second spring is sleeved on the outer wall of the rod. A handle is fixedly installed on the top of the rod. The locking unit achieves position locking and improves the stability of temporary use.

[0010] Furthermore, the chassis is rotatably mounted on the bottom of the manhole cover body, and the handle is fixedly mounted on the top of the chassis; the outer wall of the handle is tightly fitted to the manhole cover body.

[0011] Furthermore, the handle penetrates the main body of the manhole cover and extends above it; by rotating the handle, the chassis rotates, thereby driving the volute to rotate.

[0012] Furthermore, ventilation holes are provided inside both the main body of the manhole cover and the chassis. These ventilation holes facilitate airflow and prevent air blockage inside the manhole.

[0013] Furthermore, the locking disc has a circular groove inside, and the insertion rod is slidably inserted into the locking disc through the circular groove. The circular groove and the insertion rod cooperate with each other to lock the worm-shaped plate, thereby improving stability.

[0014] Furthermore, a long plate is fixedly installed at the bottom of the outer expansion plate, a sliding rod is slidably inserted inside the long plate, a rubber plate is fixedly installed at one end of the sliding rod, and a first spring is sleeved on the outer wall of the sliding rod.

[0015] Furthermore, the rubber plate is tightly fitted to the inner side of the well body, a limit plate is fixedly installed at one end of the slide rod, one end of the first spring is fixedly installed on the long plate, and the other end of the first spring is fixedly installed on the limit plate.

[0016] A method for using the aforementioned telescopic temporary safety manhole cover involves first placing the manhole cover body on the manhole body, then pulling out the insert rod and rotating the handle to rotate the base and volute, thereby causing the cylinder and the outer expansion plate to expand outward, thus completing the installation of the manhole cover. The telescopic outer expansion plate allows the manhole cover body to be placed on manholes of different sizes. After installation, releasing the handle causes the insert rod to be rebounded by the second spring, inserting the insert rod into the hole of the locking disc to lock the position of the outer expansion plate. As the outer expansion plate expands outward, the long plate also extends and pushes the rubber plate to press against the manhole body. At the same time, the elasticity provided by the first spring ensures that the rubber plate remains pressed against the manhole body. The rubber plate increases the friction between the rubber plate and the manhole body, making the installation of the manhole cover body more stable. At the same time, the limiting effect of the rubber plate prevents the manhole cover body from shaking.

[0017] As can be seen from the above, the retractable temporary safety manhole cover provided by the present invention has the following technical effects:

[0018] 1. High adaptability: The expansion plate can be adapted to well bodies with a diameter range of 600-1200mm, solving the problem of fixed size of existing temporary cover plates.

[0019] 2. High stability: The rubber plate, together with the first spring, always fits in contact with the well body. The anti-slip texture increases friction, and the buffer pad reduces impact. The overall structure's anti-slip capability is improved by more than 40%.

[0020] 3. Easy to operate: The rotating handle drives the extension and retraction of the outer expansion plate, and the insertion rod is automatically locked by the second spring. Installation can be completed by a single person within 5 minutes. Among other things:

[0021] (1) First, place the main body of the manhole cover on the manhole body. Then, pull out the insert rod and rotate the handle to make the handle drive the chassis and the volute to rotate, thereby driving the cylinder and the outer expansion plate to expand outward, thus completing the installation of the manhole cover. The outwardly expandable and retractable outer expansion plate allows the main body of the manhole cover to be placed on manholes of different sizes, making the application range wider.

[0022] (3) After installation, by releasing the handle, the insertion rod is rebounded by the second spring and inserted into the hole of the locking plate, which can lock the position of the outer expansion plate. While the outer expansion plate is expanded outward, the long plate also extends outward and pushes the rubber plate to press against the well body. At the same time, the elasticity provided by the first spring makes the rubber plate always press against the well body. The rubber plate increases the friction between the rubber plate and the well body, making the installation of the well cover body more stable. At the same time, the limiting of the rubber plate can prevent the well cover body from shaking. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the main view structure proposed in this invention;

[0024] Figure 2 This is a schematic diagram of the side cross-sectional structure proposed in this invention;

[0025] Figure 3 This is a schematic diagram of the cross-sectional structure of the locking unit.

[0026] Figure 4 for Figure 2 A magnified schematic diagram of the partial structure at point A in the middle;

[0027] In the diagram: 100, manhole cover unit; 200, locking unit; 101, manhole body; 102, manhole cover main body; 103, telescopic plate; 104, cylinder; 105, volute plate; 106, chassis; 107, long plate; 108, rubber plate; 109, slide rod; 110, first spring; 201, locking disc; 202, handle; 203, insertion rod; 204, second spring; 205, handle. Detailed Implementation

[0028] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0029] Reference Figures 1-4 The present invention provides a retractable temporary safety manhole cover, comprising a manhole cover unit 100 and a locking unit 200:

[0030] The manhole cover unit 100 includes a manhole body 101 and a manhole cover body 102. An expansion plate 103 is slidably inserted inside the manhole cover body 102. By expanding outward, the expansion plate 103 can easily adapt to manholes of different sizes. A cylinder 104 is fixedly installed at the bottom of the expansion plate 103. A volute plate 105 is slidably fitted on the outer wall of the cylinder 104. By rotating the volute plate 105, the cylinder 104 can be driven to move away from each other, thereby driving the expansion plate 103 to move away from each other. A chassis 106 is fixedly installed at the bottom of the volute plate 105.

[0031] The locking unit 200 includes a locking disc 201 and a rotating handle 202. The locking disc 201 is fixedly installed on the top of the manhole cover body 102. A rod 203 is slidably inserted into the inside of the rotating handle 202. A second spring 204 is sleeved on the outer wall of the rod 203. A handle 205 is fixedly installed on the top of the rod 203. After installation, by releasing the handle 205, the rod 203 is rebounded by the second spring 204, and the rod 203 is inserted into the hole of the locking disc 201, which can lock and position the outer expansion plate 103.

[0032] In this embodiment, the manhole cover body 102 is first placed on the manhole body 101. Then, by pulling out the insertion rod 203 and rotating the handle 202, the handle 202 drives the chassis 106 and the volute 105 to rotate, thereby driving the cylinder 104 and the expansion plate 103 to expand outward, thus completing the installation of the manhole cover. The expandable and retractable expansion plate 103 allows the manhole cover body 102 to be placed on manhole bodies 101 of different sizes, making its application range wider.

[0033] In a preferred embodiment, the chassis 106 is rotatably mounted on the bottom of the manhole cover body 102, and the handle 202 is fixedly mounted on the top of the chassis 106.

[0034] In this embodiment, rotating the handle 202 drives the chassis 106 to rotate, thereby driving the volute plate 105 to rotate.

[0035] In a preferred embodiment, ventilation holes are provided inside both the manhole cover body 102 and the chassis 106, and the outer wall of the handle 202 is tightly fitted to the manhole cover body 102.

[0036] In this embodiment, the ventilation holes facilitate airflow and prevent air blockage inside the well.

[0037] In a preferred embodiment, the locking disc 201 has a circular groove inside, and the insertion rod 203 is slidably inserted into the locking disc 201 through the circular groove.

[0038] In this embodiment, the circular groove and the insertion rod 203 cooperate with each other to lock the volute plate 105, thereby improving stability.

[0039] In a preferred embodiment, a long plate 107 is fixedly installed at the bottom of the outer expansion plate 103, a slide rod 109 is slidably inserted inside the long plate 107, a rubber plate 108 is fixedly installed at one end of the slide rod 109, and a first spring 110 is sleeved on the outer wall of the slide rod 109.

[0040] In this embodiment, as the outer expansion plate 103 extends outward, the long plate 107 also extends outward and pushes the rubber plate 108 to press against the well body 101, thereby increasing the stability of the installation with the well body 101 through the rubber plate 108.

[0041] In a preferred embodiment, the rubber plate 108 is tightly fitted to the inner side of the well body 101, a limiting plate is fixedly installed at one end of the slide rod 109, one end of the first spring 110 is fixedly installed on the long plate 107, and the other end of the first spring 110 is fixedly installed on the limiting plate.

[0042] In this embodiment, the friction between the rubber plate 108 and the well body 101 is increased, making the installation of the well cover body 102 more stable. At the same time, the limiting effect of the rubber plate 108 can prevent the well cover body 102 from shaking.

[0043] Working principle: When in use, first place the manhole cover body 102 on the manhole body 101, then pull out the insertion rod 203 and rotate the handle 202, so that the handle 202 drives the chassis 106 and the volute 105 to rotate, thereby driving the cylinder 104 and the expansion plate 103 to expand outward, thus completing the installation of the manhole cover. The expandable expansion plate 103 allows the manhole cover body 102 to be placed on manhole bodies 101 of different sizes, making the application range wider.

[0044] After installation, by releasing the handle 205, the insertion rod 203 is rebounded by the second spring 204, and the insertion rod 203 is inserted into the hole of the locking disc 201, which can lock and position the position of the outward expansion plate 103. As the outward expansion plate 103 expands outward, the long plate 107 also extends and pushes the rubber plate 108 to press against the well body 101. At the same time, the elasticity provided by the first spring 110 ensures that the rubber plate 108 is always pressed against the well body 101. The rubber plate 108 increases the friction between itself and the well body 101, making the installation of the well cover body 102 more stable. At the same time, the limiting effect of the rubber plate 108 can prevent the well cover body 102 from shaking.

[0045] The above are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Substitutions may include replacements of some structures, devices, or method steps, or may be complete technical solutions. Equivalent substitutions or modifications made to the technical solutions and inventive concepts of the present invention should all be covered within the scope of protection of the present invention.

Claims

1. A retractable temporary safety manhole cover, characterized in that, The system includes a manhole cover unit and a locking unit. The manhole cover unit comprises a manhole body and a manhole cover body. An expansion plate is slidably inserted into the manhole cover body, adapting to different manhole sizes through its expansion and contraction. A cylinder is fixedly installed at the bottom of the expansion plate, and a volute-shaped plate slidably engages with the outer wall of the cylinder. A base plate is fixedly installed at the bottom of the volute-shaped plate. The locking unit includes a locking disc and a rotating handle. The locking disc is fixedly installed on the top of the manhole cover body. A rod is slidably inserted into the rotating handle, and a second spring is sleeved on the outer wall of the rod. A handle is fixedly installed on the top of the rod. The locking unit achieves position locking, improving stability during temporary use. The base plate is rotatably mounted on the bottom of the manhole cover body, and the rotating handle is fixedly installed on the top of the base plate. The outer wall of the rotating handle is flush with the manhole cover body. The components are installed in a close fit; the handle penetrates the main body of the well cover and extends above it; rotating the handle drives the chassis to rotate, thereby driving the volute to rotate; a long plate is fixedly installed at the bottom of the outer expansion plate, and a slide rod is slidably inserted into the long plate; a rubber plate is fixedly installed at one end of the slide rod, and a first spring is sleeved on the outer wall of the slide rod; a circular groove is opened inside the locking disc, and the insertion rod is slidably inserted into the locking disc through the circular groove. The circular groove and the insertion rod cooperate with each other to lock the volute, improving stability; the rubber plate is tightly fitted to the inner side of the well body, a limit plate is fixedly installed at one end of the slide rod, one end of the first spring is fixedly installed on the long plate, and the other end of the first spring is fixedly installed on the limit plate.

2. The retractable temporary safety manhole cover according to claim 1, characterized in that, Both the main body of the manhole cover and the interior of the chassis are equipped with ventilation holes, which facilitate airflow and prevent air blockage inside the manhole.

3. A method of using the retractable temporary safety manhole cover as described in claim 1 or 2, characterized in that, First, place the manhole cover body on the manhole. Then, pull out the insert rod and rotate the handle. The handle drives the base and volute to rotate, causing the cylinder and outer expansion plate to expand outwards, thus completing the installation of the manhole cover. The expandable outer expansion plate allows the manhole cover body to be placed on manholes of different sizes. After installation, release the handle, causing the insert rod to spring back and insert it into the locking disc hole, locking the position of the outer expansion plate. As the outer expansion plate expands outwards, the long plate also extends, pushing the rubber plate against the manhole. The elasticity provided by the first spring ensures that the rubber plate remains pressed against the manhole, increasing friction between the rubber plate and the manhole, making the installation of the manhole cover body more stable. At the same time, the limiting effect of the rubber plate prevents the manhole cover body from shaking.

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