Manhole cover extractor

Abstract

Device for extracting or detaching glued manhole covers. The invention relates to a device that allows these covers to be lifted without damaging the structure, while significantly reducing costs for local authorities and ensuring the safety of technicians. The device provides easy access to sewer systems by facilitating the removal of glued covers without requiring their complete replacement. It consists of two galvanized iron feet (1), connected to two galvanized iron legs (2), which support an I-beam (3). Beneath this platform are two galvanized iron reinforcement legs (4). A pull-type lifting jack (5) is positioned in the center of the platform, with a solid iron bar equipped with a steel eye shackle (6, 7) and a steel chain equipped with quick links and a steel hook (8, 10, 9) for lifting the manhole cover.The device according to the invention specifically meets the needs of communities in terms of sewer network maintenance, thus facilitating the removal of glued plates. Figure for abbreviation: Figure 1.

Description

Title of the invention: Manhole cover extractor

[0001] The present invention relates to a device for extracting glued manhole covers, designed to allow their removal without damaging the frame or assembly, particularly in municipal or industrial drainage networks.

[0002] Technicians responsible for maintaining sewer systems frequently encounter difficulties with glued manhole covers, primarily due to the accumulation of rust, dirt, and other residues in the grooves of the covers. Over time, these impurities solidify and act as a natural binder, strengthening the cover's adhesion. Furthermore, when they strike the cover with a sledgehammer in the wrong place to attempt extraction or detachment, the cast iron can deform slightly at the grooves, further increasing its adhesion and making removal more difficult. Consequently, many municipalities opt for complete replacement of the structure, resulting in additional maintenance costs.

[0003] Removing manhole covers without appropriate tools involves significant physical risks, including injuries due to excessive lifting force, falls, or accidents related to unbalanced loads. Using a lifting jack and a reinforced structure, such as the proposed device, significantly reduces these risks by minimizing the physical effort required from technicians. The risks associated with manually lifting heavy covers are numerous: musculoskeletal pain caused by repetitive physical exertion, injuries from handling heavy loads, as well as the risk of falls or loss of stability resulting from poor posture or the use of unsuitable tools during removal attempts. Using this device reduces these risks by making removal safer and less physically demanding for technicians.Furthermore, applying a controlled and progressive force allows for better distribution of stress and prevents accidents caused by improper load handling. Finally, the device offers increased stability thanks to its reinforced design (galvanized iron support feet, I-beam, and galvanized iron reinforcement legs), which reduces the risk of tipping or deformation during plate removal. The device according to the invention makes it possible to solve this problem by offering a solution capable of extracting or detaching glued manhole covers with minimal effort, while reducing the risks to the health and safety of technicians. It allows for faster, less costly, and safer intervention, avoiding excessive physical exertion and ensuring greater stability and safety during of the lifting. In addition, it preserves the integrity of the frame or assembly, thus avoiding the complete replacement of the structure and helping to reduce the costs associated with the maintenance of sewer networks.

[0004] The manhole cover extractor, which does not destroy the structure by mechanical action, comprises: two galvanized iron feet, two galvanized iron support legs, a metal beam of the IPN type, two iron reinforcement legs, a jack for the pulling lifting system, a solid iron retaining bar equipped with two steel eye shackles, a steel chain equipped with three quick links and a steel hook capable of supporting at least 800 kg, so that when a user operates the lifting jack, the chain is put under pressure to pull and lift the manhole cover.

[0005] The device constitutes a unique lifting system with galvanized iron feet designed to hold the frame or the manhole cover assembly, thus preventing the destruction of the structure.

[0006] The device comprises two galvanized iron support legs, each equipped with a galvanized iron foot.

[0007] It comprises a metal beam of type IPN, an I-shaped metal profile, which rests on two galvanized iron support legs.

[0008] According to one embodiment, the two galvanized iron reinforcement legs are positioned under the IPN type metal beam (I-beam metal profile), and meet at its center up to the level of the base of the feet.

[0009] The device includes a pull-lift jack which can be used to lift the plate.

[0010] The device includes a solid iron retaining bar equipped with two steel eye shackles, placed on the lifting jack in the intended location.

[0011] The device includes a steel lifting chain equipped with three steel quick links and a steel hook which tightens under pressure when the lifting jack is operated.

[0012] According to one embodiment, the extractor has a total length of 115 cm, a height of 58 cm and a total weight of less than 41 kg, which makes it both robust and easy to handle for maintenance technicians.

[0013] It comprises, in fact, according to a first characteristic, the presence of:

[0014] - two galvanized iron support feet and legs, which are placed at the ends of the manhole cover, right at the notch or hole present on the cover. These support feet and legs allow the structure to be positioned and held stably before the cover is removed or detached.

[0015] - A metal beam of type IPN (I-beam) is placed on the Support feet. The IPN beam (I-beam) forms the load-bearing structure. main, offering sufficient rigidity and strength to withstand the forces exerted during the extraction or removal of the plate.

[0016] - To ensure additional stability and reinforcement, two legs of Galvanized iron reinforcements are fixed to the base of the support feet. They go under the metal beam, at its center, and thus ensure a better distribution of the forces applied when pulling the plate.

[0017] - A lifting jack is positioned in the center of the IPN metal beam (profile (I-beam metal), it allows a steel chain attached to a steel hook to be tensioned and the plate to be lifted. The jack plays a key role in providing the necessary force; its progressive operation controls the force applied to the plate to initiate the extraction.

[0018] - A solid iron bar equipped with two eye shackles is placed above the jack of lifting, at the location designated for its operation. This solid iron bar ensures a uniform distribution of the applied force and guarantees additional stability during the lifting operation.

[0019] - A steel chain equipped with three steel quick links, attached to a hook in The steel hook is then attached to the end of the solid iron bar. This steel hook is housed in the notch or hole of the manhole cover.

[0020] - The steel chain equipped with three quick steel links, tensioned by the action of the The lifting jack allows sufficient traction to detach the plate from the frame without damaging it.

[0021] According to specific embodiments, once all the elements of the device are in place, the user operates the lifting jack. This tensions the steel chain attached to the steel hook and begins the extraction of the plate. The user carefully checks the entire device before proceeding with the final extraction of the plate by pulling, ensuring that the plate detaches without damaging the frame.

[0022] The attached drawings illustrate the invention:

[0023] Fig. 1 represents a front view (frontal elevation) of the device of the invention.

[0024] Fig. 2 represents the oblique bird's-eye view of the device.

[0025] Figure 3 shows a slightly downward perspective view of the device. With reference to these drawings, the device comprises several essential elements to ensure its effectiveness and robustness:

[0026] - The Base (1) composed of two galvanized iron legs, measuring 25 cm in length, 20 cm wide and 2 cm thick, are arranged to ensure good ground contact during lifting, preventing accidental lifting of the frame or assembly.

[0027] - The support legs, consisting of two galvanized iron legs (2), of a height 58 cm long, 8 cm wide with a depth of 3.5 cm, are designed to withstand a lifting pressure of at least 800 kg.

[0028] - A metal beam of type IPN (I-beam) (3), measuring 115 cm The plate, 10 cm long, 10 cm wide and 5.5 cm high, is placed on the support legs to resist the pressures generated when lifting the plate.

[0029] - The reinforcing legs, consisting of two galvanized iron reinforcing legs (4), measuring 70 cm long, 2.5 cm wide and 2.5 cm deep, are placed under the IPN metal I-beam (3), to connect the base feet (1) and reinforce the structure.

[0030] - The lifting jack (5), positioned in the center of the beam, is capable of supporting up to 1800 kg, which allows the plate to be lifted efficiently and safely.

[0031] - The retaining bar for the steel chain (6), consisting of a solid iron bar 20 cm long and 2.5 cm in diameter, is securely fixed to the lifting chain by 12 cm diameter steel eye shackles (7) positioned at each end of the solid iron bar, providing optimal control of the pull.

[0032] - The steel chain (8), with a length of 1 m, is capable of supporting a load The 800 kg lifting sledge is equipped with a steel hook measuring 7.5 cm long, 7 cm wide, and 1 cm thick. It also includes three steel quick links (10), each 1 cm in diameter and 8.9 cm long, positioned at both ends of the chain and in the center to securely fasten the steel hook. This assembly is specifically designed to lift the plate with optimal force and maximum safety, making the operation both safer and faster.

[0033] - The manhole cover extractor can be disassembled into ten parts: the two iron feet galvanized and galvanized iron support legs, IPN beam (I-beam), lifting jack, two galvanized iron reinforcement legs, and solid iron retaining bar equipped with two steel eye shackles, a steel chain with three steel quick links and a steel hook. This device is specifically designed for sewer network maintenance companies and local authorities involved in the maintenance of urban or industrial wastewater systems. It is particularly useful for removing or detaching stubborn manhole covers, thus contributing to more economical and sustainable management of public infrastructure. It allows for the efficient removal of glued manhole covers without damaging surrounding elements, and at a lower cost compared to complete replacement methods.

[0034] The device presented above overcomes the difficulties associated with the maintenance of sewer networks thanks to its robust design, ease of use and cost-effectiveness

Claims

Demands

1. Manhole cover extractor without destruction of the structure by mechanical action, characterized in that it comprises: two galvanized iron feet (1), two galvanized iron support legs (2), a metal IPN type I-beam (3), two iron reinforcement legs (4), a jack for the pulling lifting system (5), a solid iron retaining bar equipped with two steel eye shackles (6,7), a steel chain equipped with three quick links (8,10) and a steel hook (9) capable of supporting at least 800 kg, such that when a user operates the lifting jack, the chain is put under pressure to pull and lift the manhole cover.

2. Manhole cover extractor according to claim 1, characterized in that the two galvanized iron support legs (2) are each equipped with one of the galvanized iron feet.

3. Manhole cover extractor according to any one of the preceding claims, characterized in that the I-beam metal profile (3) rests on the two galvanized iron support legs.

4. Manhole cover extractor according to any one of the preceding claims, characterized in that the two galvanized iron reinforcing legs (4) are positioned under the IPN type metal beam (3), and meet at its center up to the level of the base of the feet (1).

5. Manhole cover extractor according to any one of the preceding claims, characterized in that the pull-up lifting jack (5) is used to lift the cover.

6. Manhole cover extractor according to any one of the preceding claims, characterized in that the solid iron retaining bar (6) equipped with two steel eye shackles (7), is placed on the lifting jack.

7. Manhole cover extractor according to any one of the preceding claims, characterized in that the steel lifting chain (8) equipped with three steel quick links (10) and a steel hook (9) ) becomes taut under pressure when the lifting jack (5) is actuation.

8. Manhole cover extractor according to any one of the preceding claims, characterized in that it is demountable into ten parts.

9. Manhole cover extractor according to any one of the preceding claims, characterized in that it has a total length of 115 cm, a height of 58 cm and a total weight of less than 41 kg, making it both robust and easy to handle for maintenance technicians.

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