Manhole anti-falling net lock buckle

Abstract

The utility model provides a manhole anti -fall net lock buckle belongs to engineering safety technical field, including base, is equipped with the net buckle on the base, the bottom of net buckle and the bottom of base fixed connection, the net buckle and base form the suspension space of top open between, the suspension space is narrow to the wide lower reaches, the edge of anti -fall net is not easy to fall off and is installed conveniently, still be equipped with a plurality of mounting holes on the base, one mounting hole is located the lower center of base, the position of this mounting hole corresponds the net buckle and mounting hole through -going, make the net buckle show left and right symmetry's'person'character shape support structure. This scheme forms the suspension space of top open through the fixed connection of net buckle and base bottom and is narrow to the wide lower reaches, can effectively joint the edge of anti -fall net, realizes quick installation and prevents its easy to fall off, telescopic handle adopts spring pre -tightening structure, through the coordinated action of bolt column, concentric sleeve, reverse sleeve and spring, make handle have elastic self -locking function when operating, and the operation is simple and fast and is connected firm.

Description

Technical Field

[0001] This utility model relates to the field of engineering safety technology, specifically to a manhole anti-fall net lock. Background Technology

[0002] In urban underground pipe networks, manholes (inspection wells) are crucial passageways for personnel to enter and exit underground pipes, well chambers, and other facilities for inspection, maintenance, and repair. They are commonly found in municipal engineering projects involving electricity, communications, drainage, and gas. Because manholes are widely distributed in various locations such as roads, green spaces, around buildings, factories, and residential areas, damaged, missing, or incompletely closed manhole covers pose a risk of accidental falls, especially in low-light conditions or without warning signs, which can easily lead to personal injury accidents. Therefore, to improve safety and prevent falls, fall protection nets are typically installed inside manholes as an important safety measure.

[0003] Fall arresting nets are typically installed on the inner wall of manhole shafts, a certain distance below the manhole cover, serving as a second safety barrier to effectively support falling personnel or objects in the event of a cover failure. Currently, there are two main installation methods for fall arresting nets: one is simple installation, such as snap-on installation. This method is quick and easy, suitable for standardized prefabricated manhole shafts, but its simple structure makes it susceptible to loosening or even detachment due to external factors such as heavy pressure or vibration. The other method, using more robust fixing methods such as welding or high-strength bolts, often results in a complex and time-consuming installation process, and makes disassembly difficult during later maintenance or repair, impacting operational efficiency. Utility Model Content

[0004] The purpose of this utility model is to provide a manhole safety net lock to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A manhole safety net latch includes: a base, on which a net latch is provided, the bottom of the net latch being fixedly connected to the bottom of the base, and a top-open suspension space being formed between the net latch and the base. The suspension space is narrow at the top and wide at the bottom, which facilitates the installation of the safety net along its edge without it easily falling off. The base is also provided with several mounting holes, one of which is located at the lower center of the base. This mounting hole corresponds to the position of the net latch and is connected to the mounting hole, so that the net latch has a symmetrical "V"-shaped support structure.

[0007] Preferably, a limiting device is rotatably installed on the base, and the limiting device is used to fix the mesh buckle so that it is close to the base.

[0008] Preferably, the limiting device includes a limiting rod, one end of which is rotatably mounted on the base via a fixed post, and a telescopic handle is installed at the end of the limiting rod away from the fixed post. The upper part of the mesh buckle is located between the fixed post and the telescopic handle.

[0009] Preferably, the bottom of the limiting rod has an inclined surface on the side near the base, which prevents the limiting rod from interfering with the top of the mesh buckle during use.

[0010] Preferably, when the limiting rod is horizontal, it is located at the narrowest point of the suspension space, which is narrower at the top and wider at the bottom.

[0011] Preferably, the telescopic handle includes a pin, with a handle fixedly connected to the end of the pin away from the base, and a concentric sleeve fixedly installed at the end of the pin near the base. A spring is sleeved on the pin, and the spring is located in the gap between the concentric sleeve and the pin. The limiting rod has a reverse sleeve inside where it connects to the telescopic handle, and the concentric sleeve and the reverse sleeve are inserted together so that the reverse sleeve is in direct contact with the spring.

[0012] Preferably, the spring is a compression spring.

[0013] Preferably, the base has a receiving hole at the location of the telescopic handle, so that the telescopic handle can be inserted into the receiving hole under the action of the spring.

[0014] The beneficial effects of the above-mentioned technical solution of this utility model are as follows:

[0015] This solution secures the safety net to the bottom of the base by fixing the mesh clips together, creating a narrower upper section and a wider lower section for easy hanging. This effectively secures the edges of the safety net, allowing for quick installation while preventing it from easily detaching and improving connection reliability. The mesh clips feature a symmetrical "A"-shaped support structure and are firmly fixed to the well shaft via mounting holes in the base, enhancing overall load-bearing capacity and structural stability. This effectively withstands the impact of falling personnel or heavy objects, ensuring the reliability of the fall protection function.

[0016] This design incorporates a rotatable limiting device mounted on the base. An inclined surface at the bottom of the limiting rod effectively prevents interference with the mesh clip, ensuring smooth operation. Furthermore, the cooperation between the limiting rod and the telescopic handle ensures the mesh clip is firmly pressed against the base after installation, preventing loosening due to vibration or external force, significantly improving safety during use. The telescopic handle employs a spring-preloaded structure. Through the coordinated action of the pin, concentric sleeve, reverse sleeve, and spring, the handle possesses an elastic self-locking function during operation, automatically engaging into the receiving hole of the base for quick locking and release. Operation is simple and the connection is secure.

[0017] The overall structure of this solution is reasonably designed, taking into account both the convenience of installation and disassembly, and ensuring the stability and safety of long-term use. It is particularly suitable for the rapid and reliable installation of fall protection nets in various municipal manholes, which is conducive to promoting its use and improving the safety protection level of urban underground facilities. Attached Figure Description

[0018] The above and other objects, features, and advantages of the present invention will become readily understood by reading the following detailed description of exemplary embodiments with reference to the accompanying drawings. In the drawings, several embodiments of the present invention are shown by way of example and not limitation, and like or corresponding reference numerals denote like or corresponding parts, wherein:

[0019] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0020] Figure 2 This is the front view of the present utility model;

[0021] Figure 3 This is the left view of the present invention;

[0022] Figure 4 This is a schematic diagram of the limiting device structure;

[0023] Figure 5 for Figure 4 Partial schematic diagram of the AA section;

[0024] Figure 6 This is a schematic diagram of the installation of this utility model.

[0025] Explanation of reference numerals in the attached figures:

[0026] 1. Base; 11. Mounting hole; 2. Net buckle; 3. Limiting device; 31. Fixing post; 32. Limiting rod; 33. Inclined surface; 34. Telescopic handle; 341. Pin post; 342. Handle; 343. Concentric sleeve; 344. Spring; 345. Reverse sleeve; 4. Suspension space; 5. Fall protection net. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Those skilled in the art should understand that the embodiments described below are only some, not all, of the embodiments disclosed. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0028] Example 1

[0029] A type of manhole safety net with 5 locking buckles, such as Figure 1-6As shown, the system includes a base 1 with several mounting holes 11. The base 1 is fixedly installed around the inner wall of the manhole through the mounting holes 11. A mesh buckle 2 is provided on the base 1. The mesh buckle 2 is preferably made of corrosion-resistant metal and has a symmetrical "V"-shaped support structure. The bottom of the base 1 and the bottom of the mesh buckle 2 are connected by welding or integral molding, forming a top-open suspension space 4 between the mesh buckle 2 and the base 1. This suspension space 4 is narrower at the top and wider at the bottom, facilitating the installation of the safety net 5 along its edge without easy detachment. In this embodiment, there are two mounting holes 11, one located at the upper center of the base 1 and the other at the lower center of the base 1. The mounting hole 11 at the lower center of the base 1 corresponds to the position of the mesh buckle 2 and is connected to the mounting hole 11, facilitating direct installation.

[0030] A limiting device 3 is rotatably installed on the base 1. The limiting device 3 includes a limiting rod 32. One end of the limiting rod 32 is rotatably installed on the base 1 via a fixing post 31. A telescopic handle 34 is installed on the end of the limiting rod 32 away from the fixing post 31. The bottom of the limiting rod 32 is provided with an inclined surface 33 on the side close to the base 1, so that when the limiting device 3 is in use, the top of the mesh buckle 2 is located between the base 1 and the limiting device 3 under the guidance of the inclined surface 33 of the limiting rod 32. The fixing post 31 and the telescopic handle 34 are located on both sides of the mesh buckle 2, respectively, to avoid interference between the limiting rod 32 and the mesh buckle 2 when in use. When the limiting rod 32 is horizontal, it is located at the narrowest point of the suspension space 4, which is narrow at the top and wide at the bottom. The limiting rod 32 is used to make the fixed mesh buckle 2 close to the base 1.

[0031] The telescopic handle 34 includes a pin 341. A handle 342 is fixedly connected to the end of the pin 341 away from the base 1. The handle 342 is used by the operator to pull the handle away from the base 1 and to rotate the limiting rod 32 around the fixed pin 31. A concentric sleeve 343 is fixedly installed at the end of the pin 341 near the base 1. A compression spring 344 is also sleeved on the pin 341. The compression spring 344 is located in the gap between the concentric sleeve 343 and the pin 341. In addition, a reverse sleeve 345 is provided inside the connection between the limiting rod 32 and the telescopic handle 34. The concentric sleeve 343 and the reverse sleeve 345 are installed with an interference fit, so that the reverse sleeve 345 is in direct contact with the compression spring 344. The compression spring 344 is used to drive the telescopic handle 34 to move towards the base 1. The limiting mechanism between the handle 342, the concentric sleeve 343, and the anti-sleeve 345 can limit the telescopic handle 34 from or away from the base 1. The telescopic amount can be designed according to the actual usage.

[0032] Based on this, a receiving hole (not shown in the figure) is also provided on the base 1 corresponding to the telescopic handle 34. The telescopic handle 34 is automatically inserted into the receiving hole for fixation under the action of the spring 344 to prevent the mesh buckle 2 from deforming or failing.

[0033] The workflow of this solution is as follows: The base 1 is evenly installed on the inner wall of the manhole. Specifically, bolts or other workpieces can be used to install it through the mounting holes 11 of the base 1, or it can be pre-embedded during production. After the base 1 is installed, the edges of the fall arrest net 5 are sequentially inserted into the suspension space 4 from the top between the base 1 and the net buckle 2. The fall arrest net 5 is then installed. The worker then pulls the handle 342, causing the telescopic handle 34 to extend. The handle 34 is then rotated around the fixed rod towards the net buckle 2. The top of the net buckle 2 is guided along the inclined surface 33 of the limiting rod 32 to avoid interference. After the limiting rod 32 is in place, the handle 342 is released. The telescopic handle 34 returns to its original position under the action of the spring 344 and inserts into the socket on the base 1, completing the positioning and limiting of the net buckle 2.

[0034] The above-described preferred embodiments of the present invention are provided for guidance, but it will be apparent to those skilled in the art that such embodiments are provided merely by way of example. Many modifications, alterations, and alternatives will arise in the mind and spirit of the present invention without departing from its intent. It should be understood that various alternatives to the embodiments of the present invention described herein may be employed in the practice of the present invention. The appended claims are intended to define the scope of protection of the present invention and therefore cover the modular compositions, equivalents, or alternatives within the scope of these claims.

Claims

1. A manhole safety net lock, characterized in that, include: The base (1) is provided with a mesh buckle (2). The bottom of the mesh buckle (2) is fixedly connected to the bottom of the base (1). The mesh buckle (2) and the base (1) form a hanging space (4) with an open top. The hanging space (4) is narrow at the top and wide at the bottom, which makes it easy to install the edge of the fall protection net (5) without it easily falling off. The base (1) is also provided with several mounting holes (11). One of the mounting holes (11) is located at the lower center of the base (1). The mounting hole (11) is connected to the position of the mesh buckle (2), so that the mesh buckle (2) has a symmetrical "human" shaped support structure.

2. The manhole safety net lock buckle according to claim 1, characterized in that: A limiting device (3) is rotatably installed on the base (1), and the limiting device (3) is used to fix the mesh buckle (2) so that it is close to the base (1).

3. The manhole safety net locking buckle according to claim 2, characterized in that: The limiting device (3) includes a limiting rod (32). One end of the limiting rod (32) is rotatably mounted on the base (1) via a fixed column (31). A telescopic handle (34) is installed at the end of the limiting rod (32) away from the fixed column (31). The upper part of the mesh buckle (2) is located between the fixed column (31) and the telescopic handle (34).

4. The manhole safety net locking buckle according to claim 3, characterized in that: The bottom of the limiting rod (32) is provided with a slope (33) on the side near the base (1). The slope (33) prevents the limiting rod (32) from interfering with the top of the mesh buckle (2) when in use.

5. The manhole safety net lock buckle according to claim 4, characterized in that: When the limiting rod (32) is horizontal, it is located at the narrowest point of the suspension space (4), which is narrow at the top and wide at the bottom.

6. The manhole safety net locking buckle according to claim 3, characterized in that: The telescopic handle (34) includes a pin (341), with a handle (342) fixedly connected to the end of the pin (341) away from the base (1), and a concentric sleeve (343) fixedly installed at the end of the pin (341) close to the base (1). A spring (344) is sleeved on the pin (341), and the spring (344) is located in the gap between the concentric sleeve (343) and the pin (341). The limiting rod (32) has an inverted sleeve (345) inside where it connects to the telescopic handle (34), and the concentric sleeve (343) and the inverted sleeve (345) are inserted together so that the inverted sleeve (345) is in direct contact with the spring (344).

7. The manhole safety net lock buckle according to claim 6, characterized in that: The spring (344) is a compression spring.

8. The manhole safety net lock buckle according to claim 6, characterized in that: The base (1) has a receiving hole at the location corresponding to the telescopic handle (34), so that the telescopic handle (34) can be inserted into the receiving hole under the action of the spring (344).

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