Mechanical flip-top manhole cover

Abstract

The utility model discloses a mechanical turnover type well lid, including well pedestal and the cover plate of one end hinged with well pedestal, the other end turnover open and close through open and close mechanism, the open and close mechanism includes the support frame of bottom end hinged on well pedestal, the support of top end bending forms cover plate, and the support frame top end can be inserted in the slotted or the support lug with slotted of setting of cover plate, and support lug and / or slot are at least one, still including the handle of lower end can insert cover plate and lift cover plate, the utility model discloses full mechanical type open and close structure, does not exist open and close failure and influences work efficiency and use effect, also does not exist the safety accident caused under the opening state accidental closing etc, greatly improve the safety factor, and simple structure, low in cost, will not occupy the space under the well, greatly convenient operator's well operation, the setting of locking mechanism can have the function of preventing theft, after cover plate locking still can prevent the vibration of the vehicle rolling and produce, reduce the noise.

Description

Technical Field

[0001] This utility model relates to a manhole cover, and more particularly to a mechanically flip-type manhole cover, belonging to the field of municipal road infrastructure. Background Technology

[0002] In municipal construction and public facility maintenance, manhole covers, as a key component of underground pipeline systems, bear the important responsibility of protecting underground facilities and facilitating personnel maintenance.

[0003] Traditional manhole covers typically consist of a separate base and a cover plate placed directly inside the base. Opening them requires the operator to laboriously lift at least two opposing points, which is not only time-consuming and laborious but also poses a safety hazard of the cover falling off. Secondly, traditional manhole covers have significant deficiencies in anti-theft performance. Because the cover plate and base are separate, criminals can easily pry open the cover to steal it, causing damage to public facilities and potentially leading to safety accidents. Furthermore, over long-term use, traditional manhole covers are prone to loosening and shaking due to repeated driving and pedestrian traffic, affecting vehicle stability and pedestrian safety, and potentially generating noise pollution, impacting the quality of life of nearby residents.

[0004] Therefore, a flip-type manhole cover with one end hinged and the other end flipped was developed.

[0005] For example, Chinese patent document application number 202120545264.0 discloses a quick-opening and closing manhole cover. This is a flip-type manhole cover that is hinged to a manhole base and uses a telescopic cylinder as the driving force for flipping. When the telescopic cylinder extends, the manhole cover rotates around the hinge point with the manhole base, opening the cover for easy access by workers. When the telescopic cylinder retracts, the manhole cover rotates around the hinge point with the manhole base, closing the cover. However, in high-temperature weather (where ground temperatures can reach 70°C or even 100°C), the seals of the telescopic cylinder in this flip-type manhole cover are prone to softening, leading to seal failure and preventing the cylinder from opening or closing the cover. Even worse, when operators are entering or exiting the manhole or working underground, the seals of the telescopic cylinder may fail, causing the cover to suddenly close, potentially injuring or trapping the operator underground, resulting in a safety accident.

[0006] Another type of tilting manhole cover uses a hydraulic system as the driving force for tilting, such as the hydraulic manhole cover for integrated utility tunnels disclosed in patent document application number 201610487119.5. This includes a manhole cover, a rotating shaft connected to the manhole cover, a guide mechanism connected to the rotating shaft, a hydraulic system connected to the guide mechanism, and a control system connected to the hydraulic system. The guide mechanism includes a guide platform, a fixed platform, a stroke control rod, a hydraulic rod, and a chain fixed at one end to the manhole cover. The stroke control rod and the hydraulic rod are arranged in parallel, with one end fixed to the guide platform and the other end movably connected to the fixed platform. The control system has a limit switch, and the stroke control rod and the limit switch work together to control the opening state of the manhole cover. A through-hole is provided on the manhole cover, and the through-hole is connected to the hydraulic system via a hydraulic pipe. This type of hydraulic manhole cover has a relatively complex opening structure, complex manufacturing process, high cost, and is not suitable for large-scale application. Furthermore, the opening structure occupies most of the space under the manhole cover, making it difficult for operators to enter and exit and causing inconvenience.

[0007] There is also a less complex type of hydraulic manhole cover, such as the flip-open automatic hydraulic manhole cover with application number 201710424861.6, which includes a base, multiple hinge shafts, two connecting rods, a manhole cover top, a sealing ring, and a hydraulic cylinder. One connecting rod has three hinge points, which are respectively connected to the base, the manhole cover top, and the hydraulic cylinder piston rod via hinge shafts. The other connecting rod has two hinge points, which are respectively connected to the base and the manhole cover top via hinge shafts. This type of automatic hydraulic manhole cover has many hinge shafts and connecting rods, which are prone to corrosion and jamming with increasing service life, leading to poor opening and closing, or even complete inability to open and close, affecting normal operation. At the same time, the hydraulic cylinder structure still occupies some space, making it inconvenient for operators. Utility Model Content

[0008] To solve the aforementioned technical problems, this utility model provides a mechanically flip-type manhole cover with a fully mechanical opening and closing structure. This eliminates the risk of opening / closing failure affecting work efficiency and usability, and also prevents accidents caused by accidental closure while open, significantly improving safety. Furthermore, its simple structure and low cost, without occupying underground space, greatly facilitate underground operations. The locking mechanism provides anti-theft functionality and, after locking the cover, prevents vibrations from vehicles running over it, reducing noise.

[0009] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0010] A mechanically flip-type manhole cover includes a manhole base and a cover plate that is hinged to the manhole base at one end and flipped open and closed at the other end via an opening and closing mechanism. The opening and closing mechanism includes a support frame that is hinged to the manhole base at the bottom end and bent at the top end to form a support portion to support the cover plate. The cover plate is provided with a slot or a support lug with a slot that can be inserted into the top end of the support frame, and there is at least one support lug and / or slot. The cover plate also includes a handle that can be inserted into the cover plate at the bottom end and lift the cover plate.

[0011] A further improvement of the present invention is that: the cover plate is provided with an installation hole, and a non-removable locking box with an open bottom is fixed on the upper surface of the installation hole. The top cover of the locking box has an opening and closing hole that allows the lower end of the handle to be inserted through it and to lock the top cover of the locking box after the handle is rotated. The opening and closing hole is an elongated shape that can be sealed.

[0012] A further improvement of this utility model is that: the locking box on the cover plate is provided with a locking mechanism for locking the well base and the cover plate. The locking mechanism includes a sliding lock cylinder that can be opened and closed by pressing and rotating the handle and can be popped up; the lower end of the sliding lock cylinder is provided with a rotating lock pin that protrudes outward to lock the well base.

[0013] A further improvement of the present invention is that the sliding lock cylinder includes a detachable plate mounted on a mounting hole, a sliding pin passing through the detachable plate, a rotating plate mounted on the upper end of the sliding pin, and a rotating lock pin mounted on the lower end; a compression spring is sleeved on the sliding pin between the rotating plate and the detachable plate, and at least one of the rotating plate and the rotating lock pin is detachably mounted; at least one slot is provided on the rotating plate to cooperate with the lower end of the handle, and at least one insert block capable of being inserted into the slot is provided at the lower end of the handle.

[0014] A further improvement of the present invention is that the sliding lock cylinder includes a detachable plate mounted on a mounting hole, a sliding pin passing through the detachable plate, a rotating plate mounted on the upper end of the sliding pin, and a rotating lock pin mounted on the lower end; a compression spring is sleeved on the sliding pin between the rotating plate and the detachable plate, and at least one of the rotating plate and the rotating lock pin is detachably mounted; at least one slot is provided on the rotating plate to cooperate with the lower end of the handle, and at least one insert block capable of being inserted into the slot is provided at the lower end of the handle.

[0015] A further improvement of this utility model is that: a second limiting plate is provided on the lower surface of the detachable plate, and a limiting groove for locking the rotating locking pin after the sliding lock core is locked is provided on the second limiting plate; a first limiting plate is provided on the inner surface of the top cover of the locking box, and a limiting groove for locking the lower end of the handle after the sliding lock core is opened is provided on the first limiting plate; and a locking block that protrudes to the side and locks the rotating locking pin is provided on the well base.

[0016] A further improvement of the present invention is that the handle includes a handle post, the upper end of which is a grip portion and the lower end is a hook portion that is laterally arranged relative to the handle post and extends in one or two directions, and the insert block is disposed on the lower end surface of the hook portion.

[0017] A further improvement of the present invention is that the cover plate on the well base is single-opening, double-opening, or multi-opening; when single-opening, a support frame is set up as one; when double-opening or multi-opening, a support frame is set up as two and supports two of the cover plates, while the multi-opening cover plates without support frames are connected in sequence by pins inserted and fixed in the slots to support the whole.

[0018] A further improvement of the present invention is that: a locking component for fastening the support frame or pin is provided at the slot opening, the locking component being a buckle or a through fastening bolt; a lifting component is also provided on the well base, the end of which extends out to support the support frame in the non-supported state, and the end of the extended end of the lifting component is bent upward to form a limit.

[0019] A further improvement of this utility model is that: a hinged cylinder is fixed on the well base, which allows the bottom end of the support frame to be inserted and rotated, and a limit is provided at the bottom end of the support frame to prevent it from falling out; the length of the support frame and the hinge position make the opening angle of the cover plate 60° to 85°.

[0020] The technological advancements achieved by this utility model due to the adoption of the above technical solution are as follows:

[0021] This utility model's flip-type manhole cover features a fully mechanical opening and closing structure, eliminating the risk of opening / closing failure affecting work efficiency and usability, as well as the risk of accidental closure while open, thus greatly improving safety. Furthermore, its simple structure and low cost, without occupying underground space, significantly facilitate underground operations. The locking mechanism provides anti-theft functionality and, after locking the cover, prevents vibrations from vehicles running over it, reducing noise.

[0022] This invention utilizes a hook at the bottom of the handle and an elongated opening / closing hole. The hook extends into the opening / closing hole, and after rotation, it intersects with the opening / closing hole, locking laterally at the opening / closing hole, allowing for easy lifting of the cover. When not in use, the hook is rotated to be parallel to the opening / closing hole and removed, making operation simple. Furthermore, the handle is highly versatile; multiple covers only require one handle, significantly reducing manufacturing and usage costs. Even if one handle is damaged, the others remain usable.

[0023] This utility model features a locking mechanism between the cover plate and the manhole base, which locks the cover plate and the manhole base securely. This serves two purposes: firstly, it prevents theft; secondly, when a vehicle drives over the cover plate, the locked cover plate will not bounce, reducing noise and extending its lifespan. The handle hook with a locking block acts as the key to the locking mechanism. After inserting the locking block into the slot, pressing down and rotating it opens and closes the locking mechanism. This simple operation greatly improves the convenience for operators.

[0024] The first limiting plate on the locking mechanism of this utility model can lock the lower end of the handle after the locking mechanism is opened, preventing the handle from falling off; the second limiting plate on the locking mechanism can prevent the locking mechanism from being misoperated due to vibration when a vehicle passes by after the sliding lock cylinder is locked, thus improving safety performance.

[0025] The locking mechanism of this utility model is set inside the locking box, which can play an anti-theft role. The flip cover plate set on the top of the locking box can seal the opening and closing hole on the top of the locking box, preventing dirt from entering the sliding lock cylinder, causing the sliding lock cylinder to jam or malfunction, and extending the service life of the sliding lock cylinder.

[0026] After the cover plate of this utility model is opened, the support frame is locked by the weight of the cover plate. At the same time, the locking device can further lock the support frame firmly, preventing the support frame from falling out of the support lugs due to misoperation or other external forces, which could injure the operator and improve safety performance.

[0027] The opening and closing angle of the cover plate of this utility model is limited by the length of the support frame and the hinge position. The limited angle is between 60° and 85°. When it is less than 60°, the operator cannot enter. When the opening and closing angle is greater than 85°, the cover plate is easy to flip to the other side, which will generate tensile force on the support frame, damage the support frame and its locking parts, and reduce the service life. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of this utility model;

[0029] Figure 2 This is a schematic diagram of the handle structure in Embodiment 1 of this utility model;

[0030] Figure 3 This is a schematic diagram of the supporting ear piece in Embodiment 1 of this utility model;

[0031] Figure 4 This is a schematic diagram of the locking component in Embodiment 2 of this utility model;

[0032] Figure 5 This is a structural schematic diagram of Embodiment 3 of the present invention;

[0033] Figure 6This is a schematic diagram of the sliding lock cylinder of Embodiment 3 of this utility model;

[0034] Figure 7 This utility model Figure 6 A schematic diagram of the structure after removing the rotating locking pin;

[0035] Figure 8 This is a schematic diagram of the handle structure of Embodiment 3 of this utility model;

[0036] Figure 9 This is a schematic diagram of the limiting device structure of Embodiment 4 of this utility model;

[0037] Among them, 1. well base, 2. cover plate, 3. pin, 4. support frame, 5. support lug, 5-1. slot, 6. handle, 6-1. handle upright, 6-2. hand grip, 6-3. hook, 6-4. insert block, 7. opening and closing hole, 8. lifting part, 9. hinge cylinder, 10. locking part, 12. sliding lock cylinder, 12-1. sliding column, 12-2. rotating lock column, 12-3. rotating plate, 12-4. slot, 12-5. first limit plate, 12-6. second limit plate, 12-7. compression spring, 12-8. detachable plate, 13. locking block, 14. locking box. Detailed Implementation

[0038] This utility model discloses a mechanically flip-type manhole cover with a fully mechanical opening and closing structure. It eliminates the risk of opening and closing failures that could affect work efficiency and performance, and also prevents accidents caused by accidental closure while open, thus greatly improving safety. At the same time, it has a simple structure, low cost, and does not occupy underground space, greatly facilitating underground operations for personnel. The locking mechanism provides anti-theft functionality and, after locking the cover, also prevents vibrations when vehicles run over it, reducing noise.

[0039] The present invention will be further described in detail below with reference to embodiments:

[0040] Example 1:

[0041] A type of mechanically flip-up manhole cover, such as Figure 1 As shown, the manhole includes a manhole base 1 and a cover plate 2 hinged to the manhole base 1 and capable of flipping open and closed. The cover plate 2 can be circular, square, or any reasonable shape; in this embodiment, the cover plate 2 is square. The cover plate 2 on the manhole base 1 can be single-opening, double-opening, or multi-opening, depending on the size of the manhole base 1; in this embodiment, the cover plate 2 is double-opening. The cover plate 2 is generally hinged to the manhole base 1 via a rotating shaft. Both the manhole base 1 and the cover plate 2 have hinge holes, and the rotating shaft passes through the hinge holes on the manhole base 1 and the cover plate 2, allowing the cover plate 2 to be hinged to the manhole base 1 for flipping open and closed.

[0042] The cover plate 2 is flipped and opened through an opening and closing mechanism. The opening and closing mechanism includes a handle 6 for flipping and opening the cover plate 2 and a support frame 4 for supporting the opened cover plate 2.

[0043] The bottom of the handle 6 is a structure that can be inserted into the long-strip-shaped opening and closing hole 7 and lift the cover plate 2, which is used to lift the cover plate 2 and perform flipping. The common handle structure includes a handle vertical rod 6-1. The lower end of the handle vertical rod 6-1 is a hook part 6-3 that extends horizontally relative to the handle vertical rod 6-1 in one or two directions. For example, Figure 2 As shown, the hook part 6-3 of the handle 6 in this embodiment is bent in a straight line in two opposite directions. The length and diameter of the hook part 6-3 correspond to the length and width of the long-strip-shaped opening and closing hole 7 on the cover plate 2. The straight hook part 6-3 can be inserted along the long-strip-shaped opening and closing hole 7. After rotation, the straight hook part 6-3 will be stuck at the opening and closing hole, and the cover plate 2 can be easily lifted; when not in use, it can be directly rotated and taken out, and the operation is simple. At the same time, the handle 6 has high versatility. Only one handle 6 is needed for multiple cover plates, which can greatly reduce the manufacturing cost, and if one is damaged, the other handles 6 can still be used.

[0044] In order to make the handle 6 more convenient to use, a hand-held part 6-2 can also be provided at the top of the handle vertical rod 6-1. For example, Figure 2 As shown, the hand-held part 6-2 is a rod-shaped hand-held part vertically fixed at the top of the handle vertical rod 6-1, and its length direction is parallel to the length direction of the hook part 6-3. When rotating and lifting the cover plate 2, the direction is clear and it is more convenient to exert force, improving the operation convenience.

[0045] The structure of the support frame 4 is generally a "Z" shape or a "Ji" shape with the bottom end hinged to the well seat 1 and the top end bent to form a support part. In this embodiment, it is a "Z" shape.

[0046] The bottom end of the "Z" shape is hinged to the well seat 1. As Figure 1 shown, a hinge cylinder 9 is fixed on the well seat 1. The bottom end of the support frame 4 is inserted into the hinge cylinder 9 and can rotate, and a limit for preventing it from脱出 the hinge cylinder 9 is provided at the end. Further, bearings are provided between the hinge cylinder 9 and the bottom crossbar part of the support frame 4, making the rotation of the support frame 4 smoother.

[0047] In order to make the support frame 4 more stable when supporting the cover plate 2, generally, a slot 5-1 or a support ear piece 5 with a slot 5-1 into which the top end of the support frame 4 can be inserted is provided on the cover plate 2. As Figure 3 shown, there is at least one support ear piece 5 or slot 5-1. In this embodiment, two support ear pieces 5 are provided on the cover plate 2, and both support ear pieces have slots 5-1.

[0048] After the cover plate 2 is opened, the top of the support frame 4 engages with the slot 5-1 of the support lug 5, and the support frame is locked by the weight of the cover plate, thus achieving stable support for the cover plate 2. The opening and closing angle of the cover plate of this utility model is limited to between 60° and 85°. When the angle is less than 60°, the operator cannot enter; when the opening and closing angle is greater than 85°, the cover plate is prone to flipping to the other side, generating tensile force on the support frame, damaging the support frame and its locking parts, and reducing its service life.

[0049] The well base 1 is also provided with a lifting member 8 that extends outward to support the support frame 4 in the non-supported state. The end of the extended end of the lifting member 8 is bent upward to form a limit.

[0050] In this embodiment, the cover plate 2 is a stainless steel structure with an internal recess, consisting of a base plate and a surrounding ring of side plates. After installation, concrete or marble needs to be poured or laid to level the recessed area, so that the cover plate 2 is flush with the ground when closed. Additionally, the cover plate 2 is provided with drainage holes, and side plates of the same height as the cover plate's side plates are also provided around the drainage holes to prevent them from being blocked when pouring concrete or laying marble.

[0051] Example 2:

[0052] The difference between this embodiment and embodiment 1 is that a locking element 10 is provided at the opening of slot 5-1. After the cover plate 2 is opened, in addition to the self-weight of the cover plate 2 locking the support frame 4, the locking element 10 can further lock the support frame 4 firmly to prevent the support frame from coming out of the support lug due to misoperation or other external forces, which could injure the operator and improve safety performance.

[0053] The locking element 10 is generally a locking latch or a through-bolt. In this embodiment, the locking element 10 is a bolt, such as... Figure 4 As shown.

[0054] Example 3:

[0055] The difference between this embodiment and embodiments 1 and 2 is that a locking mechanism is also provided between the cover plate 2 and the manhole seat 1. After the cover plate is placed on the manhole seat, the cover plate 2 and the manhole seat 1 are locked together. On the one hand, it has an anti-theft function; on the other hand, the locked cover plate 2 is in close contact with the manhole seat, so there will be no bouncing when the vehicle passes over the manhole cover, which reduces noise and extends the service life of the cover plate.

[0056] like Figures 5-7As shown, the locking mechanism includes a sliding lock cylinder 12 and a limiting device for limiting the closing of the sliding lock cylinder 12. The sliding lock cylinder 12 includes a detachable plate 12-8 and a sliding pin 12-1. The sliding pin 12-1 passes through the detachable plate 12-8, has a rotating plate 12-3 at its upper end, and a rotating locking pin 12-2 at its lower end, with the rotating locking pin 12-2 perpendicular to the sliding pin 12-1. A mounting hole is provided on the cover plate 2, and the sliding lock cylinder 12 is detachably mounted to the mounting hole via the detachable plate 12-8, thus fixing the sliding lock cylinder 12 to the cover plate 2. There are many detachable mounting methods; the mounting method in this embodiment is as follows... Figure 6 and Figure 7 As shown, four mounting plates are fixedly welded at the mounting hole positions of the cover plate 2. A removable plate 12-8 is fixed to these four removable plates with bolts. The bolts pass through the lower removable plate 12-8 and then into the upper mounting plate. The removable plate 12-8 has a clear hole for the bolt to pass through. The mounting plate can have threaded holes, or it can have clear holes with matching nuts welded to its upper surface. The bolts can be removed directly from the inner surface of the cover plate, allowing the removable plate 12-8, which houses the sliding lock cylinder 12, to be detached. Alternatively, the removable plate 12-8 can be installed below the mounting hole without a mounting plate. Threaded holes or clear holes with nuts can be made around the mounting hole on the cover plate 2, and the removable plate 12-8 can be directly fixed to the lower part of the cover plate 2 with bolts.

[0057] A compression spring 12-7 is fitted onto the sliding post 12-1 between the rotating plate 12-3 and the detachable plate 12-8. The rebound force of the compression spring 12-7 keeps the rotating plate 12-3 upright, ensuring that the rotating locking post 12-2 remains firmly against the detachable plate 12-8 and does not rotate easily. When the sliding lock cylinder 12 needs to be opened or closed, the rotating plate 12-3 is pressed down, causing the rotating locking post 12-2 to move away from the detachable plate 12-8 and rotate. When the rotating locking post 12-2 rotates to the point where it can lock the frame of the well base 1, the rotating plate 12-3 is released. Under the action of the rebound force of the compression spring 12-7, the rotating locking post 12-2 locks the frame of the well base 1, achieving locking. Furthermore, a side-protruding locking block 13 can be provided on the well base 1 to form a lock with the rotating locking post 12-2, which can shorten the length of the rotating locking post 12-2 and reduce costs. Meanwhile, the compression spring 12-7 ensures a tight seal between the cover and the manhole cover, preventing wobbling and bouncing when vehicles pass, thus reducing noise and extending the cover's lifespan. To prevent malfunctions in the locking mechanism caused by vehicle vibration, a second limiting plate 12-6 is provided on the lower surface of the removable plate 12-8. This second limiting plate 12-6 has a limiting groove 12 on its sliding lock cylinder 12 that, after locking, engages with the rotating lock pin 12-2. Figure 7As shown, the limiting groove 12 on the second limiting plate 12-6 in this embodiment is an arc-shaped groove.

[0058] In addition, at least one of the rotating plate 12-3 and the rotating locking pin 12-2 is detachable from the sliding pin 12-1. When the detachable plate 12-8 is removed, the compression spring 12-7 can be removed by removing the rotating plate 12-3 or the rotating locking pin 12-2, so that the compression spring 12-7 can be easily removed and replaced after elastic fatigue or damage.

[0059] A non-removable locking box 14 is fixed to the upper surface of the cover plate 2. It is typically welded. The bottom of the locking box 14 is open to accommodate the closed sliding lock cylinder 12. The top cover of the locking box 14 has an opening / closing hole 7. The lower end of the handle 6 can be inserted into the opening / closing hole 7 to press the rotating plate 12-3. Furthermore, the opening / closing hole 7 is generally blocked by a plug, flip cover, etc., to prevent dirt from entering the sliding lock cylinder, which could cause the sliding lock cylinder to jam or malfunction, thus extending the service life of the sliding lock cylinder.

[0060] To enhance the anti-theft function of the sliding lock cylinder 12, at least one slot 12-4 can be provided on the rotating plate 12-3, and at least one insert 6-4 capable of being inserted into the slot 12-4 is also provided at the lower end of the hook portion 6-3 of the handle 6. Specifically, when the slot 12-4 is located on the upper surface of the rotating plate 12-3 and there is only one slot, there is also only one insert 6-4 at the lower end of the handle; when the slot 12-4 is located on the side wall of the rotating plate 12-3 and there is only one or two opposite slots, there are two spaced-apart inserts 6-4 at the lower end of the handle that lock the rotating plate 12-3; when the slots 12-4 are located on the side wall of the rotating plate 12-3 and there are multiple evenly distributed slots, there are multiple corresponding inserts 6-4 at the lower end of the handle. Figure 6 and Figure 7 As shown, in this embodiment, the slots 12-4 are disposed on the side wall of the rotating plate 12-3, and there are two symmetrical slots; Figure 8 As shown, the insert 6-4 at the lower end of the handle is set to two spaced blocks that can be inserted into the two slots 12-4 to hold the rotating plate 12-3 in place. Pressing and rotating the plate will easily open or close the sliding lock cylinder. When not in use, the plate can be removed by simply rotating it. The operation is simple and greatly improves the convenience for operators.

[0061] Furthermore, a first limiting plate 12-5 is also provided on the lower surface of the top cover of the locking box 14, and a limiting groove 12 is provided on the first limiting plate 12-5 to lock the lower end of the handle after the sliding lock cylinder is opened. The handle in this embodiment is as follows... Figure 4As shown, the device includes a handle post with a grip at the top. The lower end of the handle post has a hook portion extending in one or two directions, laterally positioned relative to the handle post 6-1. In this embodiment, the hook portion extends in two directions, corresponding to the elongated opening / closing hole 7 on the locking box. The hook portion can be inserted through the elongated opening / closing hole 7, and an insert block 6-4 is located at the lower end of the hook portion. Furthermore, two first limiting plates 12-5 are provided, located on either side of the opening / closing hole 7. The limiting groove 12 on the first limiting plate 12-5 is an arc-shaped groove, capable of locking the hook portion of the handle and providing an indication of the rotation angle for the handle's rotation.

[0062] Example 4:

[0063] The difference between this embodiment and embodiment 3 is that it uses multiple manhole covers, specifically three cover plates, such as... Figure 9 As shown, there are two support frames 4, which support the cover plates at both ends respectively. The middle cover plate is supported and fixed by pins 3 that are inserted into the support lugs 5 on the adjacent cover plates. There are also two lifting parts 8, which are located at both ends of the well base 1 respectively.

Claims

1. A mechanically flip-type manhole cover, comprising a manhole base (1) and a cover plate (2) that is hinged to the manhole base (1) at one end and flipped open and closed at the other end via an opening and closing mechanism, characterized in that: The opening and closing mechanism includes a support frame (4) with its bottom end hinged to the well base (1) and its top end bent to form a support portion supporting the cover plate (2). The cover plate (2) is provided with a slot (5-1) into which the top end of the support frame (4) can be inserted or a support lug (5) with a slot (5-1), and there is at least one support lug (5) and / or slot (5-1). It also includes a handle (6) whose lower end can be inserted into the cover plate (2) and lift the cover plate (2).

2. The mechanically flipping manhole cover according to claim 1, characterized in that: The cover plate (2) is provided with an installation hole. A non-removable locking box (14) with an open bottom is fixed on the upper surface of the installation hole. The top cover of the locking box (14) has an opening and closing hole (7) that allows the lower end of the handle (6) to be inserted through it and to lock the top cover of the locking box (14) after the handle (6) is rotated. The opening and closing hole (7) is an elongated shape that can be blocked.

3. A mechanically tilting manhole cover according to claim 2, characterized in that: The locking box (14) on the cover plate (2) is provided with a locking mechanism for locking the well seat (1) and the cover plate (2). The locking mechanism includes a sliding lock cylinder (12) that can be opened and closed by pressing and rotating the handle (6) and can be popped up. The lower end of the sliding lock cylinder (12) is provided with a rotating lock pin (12-2) that protrudes outward to lock the well seat (1).

4. A mechanically flip-type manhole cover according to claim 3, characterized in that: The sliding lock cylinder (12) includes a detachable plate (12-8) mounted on a mounting hole, a sliding pin (12-1) passing through the detachable plate (12-8), a rotating plate (12-3) mounted on the upper end of the sliding pin (12-1), and a rotating lock pin (12-2) mounted on the lower end of the sliding pin (12-1); a compression spring (12-7) is sleeved on the sliding pin (12-1) between the rotating plate (12-3) and the detachable plate (12-8), and at least one of the rotating plate (12-3) and the rotating lock pin (12-2) is detachably mounted; the rotating plate (12-3) is provided with at least one slot (12-4) that mates with the lower end of the handle (6), and the lower end of the handle (6) is provided with at least one insert (6-4) that can be inserted into the slot (12-4).

5. A mechanically tilting manhole cover according to claim 4, characterized in that: When there is one slot (12-4) on the upper surface of the rotating plate (12-3), there is also one insert (6-4) at the lower end of the handle; when there is one slot (12-4) on the side wall of the rotating plate (12-3), or two opposite slots, there are two spaced-apart inserts (6-4) at the lower end of the handle that hold the rotating plate (12-3); when there are multiple slots (12-4) on the side wall of the rotating plate (12-3) that are evenly distributed, there are multiple corresponding inserts (6-4) at the lower end of the handle.

6. A mechanically tilting manhole cover according to claim 4, characterized in that: The lower surface of the detachable plate (12-8) is provided with a second limiting plate (12-6), and the second limiting plate (12-6) is provided with a limiting groove for locking the rotating locking pin (12-2) after the sliding lock core (12) is locked; the inner surface of the top cover of the locking box (14) is provided with a first limiting plate (12-5), and the first limiting plate (12-5) is provided with a limiting groove for locking the lower end of the handle after the sliding lock core (12) is opened; the well base (1) is provided with a locking block (13) that protrudes to the side and locks the rotating locking pin (12-2).

7. A mechanically tilting manhole cover according to claim 4, characterized in that: The handle (6) includes a handle post (6-1), the upper end of which is a hand grip (6-2), and the lower end is a hook (6-3) that is laterally arranged relative to the handle post (6-1) and extends in one or two directions. The insert (6-4) is disposed on the lower end face of the hook (6-3).

8. A mechanically tilting manhole cover according to claim 1, characterized in that: The cover plate (2) on the well base (1) can be single-opening, double-opening, or multi-opening; when it is single-opening, the support frame (4) is set to one; when it is double-opening or multi-opening, the support frame (4) is set to two and supports two of the cover plates (2), while the multi-opening cover plates without support frames (4) are connected in sequence by pins (3) inserted and fixed in the slots (5-1) to support the whole.

9. A mechanically tilting manhole cover according to claim 1 or 8, characterized in that: The slot (5-1) opening is provided with a locking part (10) for fastening the support frame (4) or the pin (3), and the locking part (10) is a locking buckle or a through fastening bolt; the well base (1) is also provided with a lifting part (8) that extends out to support the support frame (4) in the non-supported state, and the end of the extended end of the lifting part (8) is bent upward to form a limit.

10. A mechanically tilting manhole cover according to claim 1, characterized in that: The well base (1) is fixed with a hinged cylinder (9) that allows the bottom end of the support frame (4) to be inserted and rotated, and the bottom end of the support frame (4) is provided with a limit to prevent it from falling out; the length of the support frame (4) and the hinge position make the opening angle of the cover plate (2) 60°~85°.

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