Self-locking manhole cover

Abstract

The present invention designs a self-locking manhole cover. The main cover and the manhole seat are connected by a hinge. When the cover is closed, the self-locking system is activated to lock the manhole cover. The toothed plates of the lock catch are respectively engaged with the toothed plates of the lock. The two small levers are in a state close to overlapping, and the gap is at the distal end of the pull rod. The thin rod part of the upper-thin-and-lower-thick special-shaped pull rod is located in the gap. The self-locking system has two ways to open the main cover. One is to rely on the linkage opening mechanism to open. The linkage opening wrench is located in the center of the upper surface of the main cover and can link the pull rod. The pull rod links the lock, and the lock disengages from the lock catch, thus realizing the opening of the main cover. The other is to rely on the one-way hand-pull self-locking device to open. When the thick rod part of the upper-thin-and-lower-thick special-shaped pull rod is located at the gap when the single-phase pull handle is pulled up, it forces the two small levers to be in an angled state, and the toothed plates of the lock catch are respectively separated from the toothed plates of the lock, and the main cover is opened.

Description

Technical Field

[0001] The present invention relates to a manhole cover, in particular to a self-locking manhole cover. Background Art

[0002] The manhole cover for the power engineering working well is applicable to power pipe wells, incoming and outgoing line tunnels of substation rooms, and power distribution equipment, and is also applicable to motor vehicle driving and parking areas or areas where motor vehicle driving and parking are prohibited, such as urban roads, highways, living communities, and green belts. Compared with the manhole cover pried up by a bolt, for the self-locking manhole cover, the manhole cover and the manhole seat are connected by a hinge, avoiding the loss of the manhole cover and causing people or vehicles to fall into the well. When the manhole cover is opened, the included angle between the manhole cover and the manhole seat is not less than 90°, providing a warning sign for pedestrians and vehicles, and it is not easy to tilt sideways and damage construction workers; compared with the manhole cover with the manhole seat and the manhole cover fixed by bolts, the self-locking manhole cover adopts a self-locking structure, and the greater the pressure, the tighter it locks, with a tight combination, no vibration, and no noise. Summary of the Invention

[0003] The purpose of the present invention is to provide a self-locking manhole cover with a self-locking function, in which the main cover is tightly connected to the manhole seat, not easy to fall off, and convenient to open, and the unlocking and locking functions are completed while opening and closing the manhole cover.

[0004] The technical solution adopted by the present invention to solve its technical problems is: the self-locking manhole cover includes a manhole seat, a waterproof cover, a main cover, a self-locking system, and a hinge. The manhole seat is connected to the main cover through the hinge; the manhole seat is a lap joint structure of two upper-large and lower-small annular circular bodies, and at least one convex platform is evenly arranged around the outer side wall;

[0005] The waterproof cover and the main cover are cylindrical structures. The waterproof cover is located below the main cover, is sleeved with a sealing ring, and is embedded in the inner side wall of the manhole seat;

[0006] The self-locking system includes locks and latches, a linkage opening mechanism, a linkage opening wrench, and a one-way hand pull; there is at least one lock and one latch, and they correspond one by one. The linkage opening mechanism includes a pull rod and a slot. The pull rod is located on the lower surface of the main cover, and the slot runs through the upper and lower surfaces of the main cover. There is at least one pull rod, which corresponds one by one to the locks and the latches. One end of the pull rod is connected to the slot, and the other end is connected to the locks. There is a gap at the connection. The pull rods are all composed of two small levers of different lengths. The two small levers are connected along the length direction, and the cumulative length of the two small levers is greater than the radius of the main cover;

[0007] The locks are evenly distributed at the edge of the lower surface of the main cover. The linkage opening wrench is located in the center of the upper surface of the main cover, is connected to the slot, and can drive the pull rod, and the pull rod drives the locks; the locks and the latches are both provided with toothed plates;

[0008] The latch is located around the inner sidewall of the well seat and above the waterproof cover;

[0009] The one-way hand pulls are evenly distributed on the upper surface of the main cover. The one-way hand pulls are provided with upper-thin and lower-thick special-shaped pull rods, and the upper-thin and lower-thick special-shaped pull rods include thin rod parts and thick rod parts;

[0010] When the main cover is closed, the self-locking system is activated to lock the self-locking manhole cover. The toothed plates of the latch are respectively engaged with the toothed plates of the lock. The two small levers are in a nearly overlapping state. The gap is at the distal end of the pull rod, and the thin rod part of the upper-thin and lower-thick special-shaped pull rod is located in the gap;

[0011] There are two ways to open the self-locking manhole cover: The first way is to rotate the linkage opening wrench counterclockwise. The two small levers are in an angular state. The gap is at the proximal end of the pull rod, forcing the toothed plates of the latch to be disengaged from the toothed plates of the lock respectively. At this time, the main cover is in an open state; The second way is to pull up the one-way hand pull. The thick rod part of the upper-thin and lower-thick special-shaped pull rod is located in the gap, forcing the toothed plates of the latch to be disengaged from the toothed plates of the lock respectively. At this time, the main cover is in an open state; The well seat (1), the waterproof cover (2), and the main cover (3) are made of a thermosetting composite material composed of unsaturated resin and glass fiber and are formed by compression molding.

[0012] The advantages of the present invention are as follows:

[0013] 1. The well seat has an upper-large and lower-small structure and is evenly provided with at least one boss. When the ground subsides or the road surface is lifted during road construction, the well seat is pried up and padded by the boss, so as to adjust the height;

[0014] 2. The waterproof cover is sleeved with a sealing ring and is embedded in the inner sidewall of the well seat. The sealing ring is squeezed between the waterproof cover and the sidewall of the well seat by the self-weight of the waterproof cover, so as to achieve the purpose of waterproofing; The waterproof cover is located under the main cover. When the main cover is opened, the waterproof cover is still in a closed state, which can prevent falling; The waterproof cover can also be used to install intelligent systems such as on-line monitoring and remote control;

[0015] 3. The function of the main cover is to close the inspection wellhead and can be opened when needed. There is at least one lock installed on the inner upper surface. As long as one lock does not fail, the self-locking function can be ensured; The self-locking system adopts a self-locking structure. The greater the pressure, the tighter it locks. It is more closely combined with the manhole cover fixed by bolts between the well seat and the manhole cover, without vibration and noise; The linkage opening wrench is located in the center of the upper surface of the main cover and can drive the lock to open and close, so as to achieve the function of automatically opening and closing the main cover;

[0016] 4. A spare one-way hand pull is provided on the outer surface of the main cover. When the linkage opening mechanism fails, pulling up the spare one-way hand pull simultaneously can open the main cover, and pressing the spare one-way hand pull can close the main cover. The opening and closing lock functions are completed while opening and closing the manhole cover, without the need for a lock-opening tool.

[0017] 5. The manhole base and the main cover are connected by a hinge. When the main cover is opened, the included angle between the main cover and the manhole base is greater than 90°, which serves as a warning to pedestrians and vehicles. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be described in detail below with reference to the accompanying drawings:

[0019] Figure 1 is a structural diagram of the self-locking manhole cover of the present invention;

[0020] Figure 2 is a schematic diagram of the state of the linkage opening mechanism (two small levers are in an angular state) when the self-locking system of the self-locking manhole cover of the present invention is unlocked;

[0021] Figure 3 is a schematic diagram of the upper surface of the main cover of the self-locking manhole cover of the present invention, and a schematic diagram of the positions of the linkage opening wrench, the one-way hand pull, and the slot on the main cover;

[0022] Figure 4 is a schematic diagram of the lower surface of the main cover of the self-locking manhole cover of the present invention, and a schematic diagram of the positions of the pull rod, the small lever, and the lock on the main cover;

[0023] Figure 5 is a locking state diagram of the lock and the lock catch of the self-locking manhole cover of the present invention;

[0024] Figure 6 is a state diagram of the lock and the lock catch when the self-locking manhole cover of the present invention is unlocked by using a linkage opening mechanism;

[0025] Figure 7 is a state diagram of the lock and the lock catch when the self-locking manhole cover of the present invention is unlocked by using a one-way hand pull;

[0026] Figure 8 Schematic diagram of the state of the linkage opening mechanism (two small levers are in a nearly overlapping state) when the self-locking system of the self-locking manhole cover of the present invention is locked. DETAILED DESCRIPTION OF THE INVENTION

[0027] The present invention will be described in detail below with reference to specific embodiments and the accompanying drawings:

[0028] As Figure 1As shown in the figure, the self-locking manhole cover includes a manhole seat 1, a waterproof cover 2, a main cover 3, a self-locking system 4 and a hinge 5. The manhole seat 1 is connected to the main cover 3 through the hinge 5. The manhole seat 1 has an upper-large and lower-small structure and is evenly provided with at least one boss 11.

[0029] The waterproof cover 2 is located under the main cover 3, is sleeved with a sealing ring 21, and is embedded in the inner side wall of the manhole seat 1.

[0030] As Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 8 As shown in the figure, the self-locking system 4 includes at least one lock 41 and a lock catch 42, a linkage opening mechanism 43, a linkage opening wrench 44 and a one-way hand pull 45. The linkage opening mechanism 43 includes at least one pull rod 431 and a slot 432. The pull rod 431 is located inside the main cover 3. The slot 432 runs through the inner and outer sides of the main cover 3. One end of the pull rod 431 is connected to the slot 432. The other end of the pull rod 431 is connected to the lock 41, and there is a gap 0 at the connection. The pull rod 431 is composed of two small levers 4310. The two small levers 4310 are connected along the length direction, and the cumulative length of the two small levers 4310 is greater than the radius of the main cover 3.

[0031] The locks 41 are evenly distributed on the outer edge of the inner side of the main cover 3. The linkage opening wrench 44 is located in the middle of the upper surface of the main cover 3, is connected to the slot 432, and can drive the pull rod 431. The pull rod 431 drives the lock 41. Both the lock 41 and the lock catch 42 are provided with toothed plates 400.

[0032] The lock catches 42 are evenly distributed around the inner side wall of the manhole seat 1 and are located above the waterproof cover 2.

[0033] The one-way hand pulls 45 are evenly distributed and penetrate through the outer edge of the main cover 3. The one-way hand pulls 45 are provided with upper-thin and lower-thick special-shaped pull rods. The upper-thin and lower-thick special-shaped pull rods include a thin rod part 4511 and a thick rod part 4512.

[0034] As Figure 5 and Figure 8As shown, when the main cover 3 is closed, the self-locking system 4 is activated to lock the self-locking manhole cover. The toothed plates 400 of the lock catch 42 are respectively engaged with the toothed plates 400 of the lock 41. The two small levers 4310 are in a nearly overlapping state. The gap 0 is at the distal end of the pull rod 431. The thin rod portion 4511 of the upper-thin-and-lower-thick special-shaped pull rod is located in the gap 0.

[0035] As Figure 2 , Figure 6 and Figure 7 As shown, there are two ways to open the self-locking manhole cover: The first way is to rotate the linkage opening wrench 44 counterclockwise. The two small levers 4310 are in an angular state. The gap 0 is at the proximal end of the pull rod 431, forcing the toothed plates 400 of the lock catch 42 to disengage from the toothed plates 400 of the lock 41 respectively. At this time, the main cover 3 is in the open state. The second way is to pull up the one-way hand pull 45. The thick rod portion 4512 of the upper-thin-and-lower-thick special-shaped pull rod is located in the gap 0, forcing the toothed plates 400 of the lock catch 42 to disengage from the toothed plates 400 of the lock 41 respectively. At this time, the main cover 3 is in the open state.

[0036] The manhole base 1, the waterproof cover 2, and the main cover 3 can be formed by compression molding with a thermosetting composite material composed of unsaturated resin, glass fiber, etc., or can be formed by casting ductile iron.

Claims

1. Self-locking manhole cover, characterized in that: It includes a well seat (1), a waterproof cover (2), a main cover (3), a self-locking system (4) and a hinge (5). The well seat (1) is connected to the main cover (3) through the hinge (5). The well seat (1) is a lap structure of two annular circular bodies with a larger upper part and a smaller lower part, and at least one boss (11) is evenly arranged around the outer side wall. The waterproof cover (2) and the main cover (3) are cylindrical structures. The waterproof cover (2) is located below the main cover (3), is sleeved with a sealing ring (21), and is embedded in the inner side wall of the well seat (1). The self-locking system (4) includes a lock (41), a lock catch (42), a linkage opening mechanism (43), a linkage opening wrench (44) and a one-way hand pull (45). There is at least one lock (41) and one lock catch (42), and they are in one-to-one correspondence. The linkage opening mechanism (43) includes a pull rod (431) and a slot (432). The pull rod (431) is located on the lower surface of the main cover (3). The slot (432) runs through the upper and lower surfaces of the main cover (3). There is at least one pull rod (431), which is in one-to-one correspondence with the lock (41) and the lock catch (42). One end of the pull rod (431) is connected to the slot (432), and the other end is connected to the lock (41). There is a gap (0) at the connection. The pull rod (431) is composed of two small levers (4310) with different lengths. The two small levers (4310) are connected along the length direction, and the cumulative length of the two small levers (4310) is greater than the radius of the main cover (3). The locks (41) are evenly distributed at the edge of the lower surface of the main cover (3). The linkage opening wrench (44) is located in the middle of the upper surface of the main cover (3), is connected to the slot (432), and can drive the pull rod (431) in a linkage manner. The pull rod (431) drives the lock (41) in a linkage manner. The locks (41) and the lock catches (42) are both provided with toothed plates (400). The lock catches (42) are located around the inner side wall of the well seat (1) and above the waterproof cover (2). The one-way hand pulls (45) are evenly distributed on the upper surface of the main cover (3). The one-way hand pulls (45) are provided with a special-shaped pull rod with a thinner upper part and a thicker lower part. The special-shaped pull rod with a thinner upper part and a thicker lower part includes a thin rod part (4511) and a thick rod part (4512). When the main cover (3) is closed, the self-locking system (4) is immediately activated to lock the self-locking manhole cover. The toothed plates (400) of the lock catches (42) are respectively engaged with the toothed plates (400) of the locks (41). The two small levers (4310) are in a state close to overlapping. The gap (0) is at the distal end of the pull rod (431). The thin rod part (4511) of the special-shaped pull rod with a thinner upper part and a thicker lower part is located in the gap (0). There are two ways to open the self-locking manhole cover: In the first way, rotate the linkage opening wrench (44) counterclockwise. The two small levers (4310) are in an angular state, and the gap (0) is at the proximal end of the pull rod (431), forcing the toothed plates (400) of the lock catch (42) to disengage from the toothed plates (400) of the lock (41) respectively. At this time, the main cover (3) is in an open state; In the second way, pull up the one-way hand pull (45). The thick rod part (4512) of the upper-thin-and-lower-thick special-shaped pull rod is located in the gap (0), forcing the toothed plates (400) of the lock catch (42) to disengage from the toothed plates (400) of the lock (41) respectively. At this time, the main cover (3) is in an open state; The well seat (1), the waterproof cover (2), and the main cover (3) are formed by molding a thermosetting composite material composed of unsaturated resin and glass fiber through compression molding.

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