Anti-theft well lid

Abstract

The utility model provides an anti-theft well lid, which relates to the technical field of well lids and comprises a well lid assembly and an unlocking assembly, the well lid assembly comprises a base, three locking grooves are formed in the inner side surface of the base, a well lid is hinged to the inner side of the base, a fixing column is arranged in the center of the bottom of the well lid, and the locking groove is formed in the fixing column. A through groove penetrating through the upper surface of the well lid is formed in the bottom of the fixing column, a threaded sleeve is rotationally installed on the surface of the fixing column, the bottom end of the threaded sleeve penetrates out of the lower surface of the fixing column, the penetrating-out end is connected with a rotating block, and a through hole is formed in the top of the rotating block. By means of the unlocking assembly and the well lid assembly, it is difficult for strangers to judge the specific shape of the unlocking block according to the shape of the through hole, meanwhile, the imitation difficulty of the unlocking assembly is high, the difficulty and cost of stealing the well lid can be further improved, and the anti-theft performance of the well lid is effectively improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of manhole covers, in particular to an anti-theft manhole cover. Background Art

[0002] Manhole covers are used to cover deep wells on roads or in homes to prevent people or objects from falling. According to the material, they can be divided into metal manhole covers, high-strength fiber cement concrete manhole covers, resin manhole covers, etc. They are generally round. They can be used in green belts, sidewalks, motorway lanes, docks, alleys, etc.

[0003] Since metal manhole covers have certain economic value, they are often stolen. In order to solve this problem, a common way is to use anti-theft manhole covers. A locking pin is set at the bottom of the anti-theft manhole cover, which can be locked with the base of the manhole cover, thereby increasing the difficulty of stealing the manhole cover. At the same time, a special wrench can be used to insert and operate the locking pin through the hole reserved on the manhole cover. However, the locking pin structure of the existing anti-theft manhole cover is relatively simple, and the shape of the wrench can be easily determined according to the shape of the hole reserved on the manhole cover, resulting in a low difficulty in imitating the wrench and a less than ideal anti-theft effect.

[0004] In summary, the utility model provides an anti-theft manhole cover to solve the above problems. Utility Model Content

[0005] In order to solve the above technical problems, the utility model provides an anti-theft manhole cover, which is achieved by the following specific technical means:

[0006] A theft-proof manhole cover comprises a manhole cover assembly and an unlocking assembly, wherein the manhole cover assembly comprises a base, the inner surface of the base is provided with three locking grooves, the inner side of the base is also hinged with a manhole cover, a fixing column is provided at the center of the bottom of the manhole cover, a through groove penetrating the upper surface of the manhole cover is provided at the bottom of the fixing column, a threaded sleeve is rotatably mounted on the surface of the fixing column, the bottom end of the threaded sleeve passes through the lower surface of the fixing column, and one end that passes through is connected to a rotating block, a through hole is provided at the top of the rotating block, a plurality of limiting grooves are arranged in an array on the inner wall of the through hole, and three locking grooves are provided at the bottom edge of the manhole cover assembly. A limit sleeve, the inner side of which is slidably installed with a limit pin, the outer surface of the threaded sleeve is threadedly connected with a movable ring, the outer surface of the movable ring is installed with three connecting rods, and the other ends of the three connecting rods are respectively connected to one end of each limit pin close to the center of the manhole cover, the unlocking assembly includes a handle, a connecting rod is provided at the bottom of the handle, an unlocking block is provided at the bottom of the connecting rod, two movable grooves are symmetrically provided on the outer surface of the unlocking block, and the inside of the movable grooves are slidably installed with limit blocks, and the side of the limit block away from the center of the unlocking block passes through the surface of the unlocking block.

[0007] Furthermore, the hinge between the manhole cover and the base and the three limiting sleeves are distributed in a circular array, and the three locking grooves correspond to the positions of the three limiting pins respectively.

[0008] Furthermore, a spring is installed inside the movable groove, and two ends of the spring are respectively against one side of the limiting block close to the center of the unlocking block and the inner wall of the limiting groove.

[0009] Furthermore, the portion of the limiting block that protrudes from the surface of the unlocking block is in an arc shape, and the upper and lower ends are flush with the surface of the unlocking block.

[0010] Furthermore, the top and bottom ends of the through slot are both provided with chamfers.

[0011] Furthermore, the unlocking block, the through slot and the through hole are adapted in shape and size.

[0012] Compared with the prior art, the utility model has the following beneficial effects:

[0013] The utility model provides an unlocking assembly and a manhole cover assembly, so that it is difficult for outsiders to judge the specific shape of the unlocking block according to the shape of the through hole. At the same time, the unlocking assembly is difficult to imitate, which can further increase the difficulty and cost of stealing the manhole cover and effectively improve the anti-theft performance of the manhole cover. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a three-dimensional schematic diagram of the manhole cover assembly in the utility model;

[0015] Figure 2 It is a three-dimensional schematic diagram of the unlocking component in the utility model;

[0016] Figure 3 It is a cross-sectional schematic diagram of the utility model during the unlocking process;

[0017] Figure 4 This utility model Figure 1 A local enlarged schematic diagram of the middle A;

[0018] Figure 5 This utility model Figure 3 A local enlarged schematic diagram of point B in the middle.

[0019] In the figure:

[0020] 1. Base; 2. Locking slot; 3. Manhole cover; 4. Fixed column; 5. Through slot; 6. Threaded sleeve; 7. Rotating block; 8. Through hole; 9. Limiting slot; 10. Limiting sleeve; 11. Limiting pin; 12. Movable ring; 13. Connecting rod; 14. Handle; 15. Connecting rod; 16. Unlocking block; 17. Movable slot; 18. Limiting block; 19. Spring. DETAILED DESCRIPTION

[0021] The following is a further detailed description of the implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but cannot be used to limit the scope of the present invention.

[0022] like Figure 1-5 As shown, the utility model provides an anti-theft manhole cover, including a manhole cover assembly and an unlocking assembly. The manhole cover assembly includes a base 1, the inner surface of the base 1 is provided with three locking grooves 2, the inner side of the base 1 is also hinged with a manhole cover 3, a fixing column 4 is provided at the center of the bottom of the manhole cover 3, a through groove 5 penetrating the upper surface of the manhole cover 3 is provided at the bottom of the fixing column 4, a threaded sleeve 6 is rotatably installed on the surface of the fixing column 4, the bottom end of the threaded sleeve 6 passes through the lower surface of the fixing column 4, and a rotating block 7 is connected to the protruding end, a through hole 8 is provided at the top of the rotating block 7, a plurality of limiting grooves 9 are arranged in an array on the inner wall of the through hole 8, and three limiting sleeves 1 are provided at the bottom edge of the manhole cover assembly. 0, the inner side of the limit sleeve 10 is slidably installed with a limit pin 11, the outer surface of the threaded sleeve 6 is threadedly connected with a movable ring 12, and the outer surface of the movable ring 12 is installed with three connecting rods 13, and the other ends of the three connecting rods 13 are respectively connected with one end of each limit pin 11 close to the center of the manhole cover 3, the unlocking component includes a handle 14, a connecting rod 15 is provided at the bottom of the handle 14, and an unlocking block 16 is provided at the bottom of the connecting rod 15, and two movable grooves 17 are symmetrically provided on the outer surface of the unlocking block 16, and the inner side of the movable groove 17 is slidably installed with a limit block 18, and the limit block 18 passes through the surface of the unlocking block 16 away from the center of the unlocking block 16.

[0023] The hinge between the manhole cover 3 and the base 1 and the three limiting sleeves 10 are distributed in a circular array, and the three locking grooves 2 correspond to the positions of the three limiting pins 11 respectively, so as to improve the anti-theft effect of the manhole cover 3.

[0024] Among them, a spring 19 is also installed inside the movable groove 17, and the two ends of the spring 19 are respectively against one side of the limit block 18 close to the center of the unlocking block 16 and the inner wall of the limit groove 9. The spring 19 is used to realize the reset rebound of the limit block 18. When the unlocking block 16 is located in the through hole 8, the spring 19 can keep the limit block 18 in the limit groove 9, so that the unlocking block 16 can drive the rotating block 7 to rotate.

[0025] Among them, the part of the limit block 18 that passes through the surface of the unlocking block 16 is in an arc shape, and the upper and lower ends are flush with the surface of the unlocking block 16. The top and bottom ends of the through groove 5 are both provided with chamfers. When the unlocking block 16 is inserted into the through groove 5, and when it is pulled out from the through hole 8 and enters the through groove 5, the arc-shaped limit block 18 contacts the chamfer and will be squeezed into the movable groove 17, so that the unlocking block 16 can pass through the inside of the through groove 5.

[0026] The unlocking block 16 , the through slot 5 and the through hole 8 are adapted in shape and size, and the unlocking block 16 can be inserted into the inner side of the through slot 5 and enter into the through hole 8 from the inner side of the through slot 5 .

[0027] Specific working principle:

[0028] During use of the utility model, the unlocking component can drive the rotating block 7 in the manhole cover assembly to rotate, thereby rotating the threaded sleeve 6. When the threaded sleeve 6 rotates, the movable ring 12 threadedly connected thereto can be driven to move up and down. The movable ring 12 pushes or pulls the limit pin 11 through the connecting rod 13, so that it penetrates into the locking groove 2 inside the base 1, or withdraws from the locking groove 2. The manhole cover 3 is limited by the limit pin 11 and the locking groove 2, thereby improving the anti-theft effect of the manhole cover 3. When the unlocking component is in use, first insert the unlocking block 16 of the unlocking component into the through groove 5, and then the arc After the shaped limit block 18 contacts the inner wall of the through groove 5, it is squeezed and compressed into the movable groove 17, so that the unlocking block 16 can pass through the inner side of the through groove 5 until the unlocking block 16 enters the through hole 8. After entering the through hole 8, the limit block 18 pops out and engages with the limit groove 9 on the inner wall of the through hole 8, so that the unlocking block 16 can drive the rotating block 7 to rotate. This structure makes it difficult for outsiders to judge the specific shape of the unlocking block 16 based on the shape of the through hole 8. At the same time, the unlocking component is difficult to imitate, which can further increase the difficulty and cost of stealing the manhole cover 3, and effectively improve the anti-theft performance of the manhole cover 3.

[0029] The implementation modes of the present invention are provided for the purpose of illustration and description. Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. An anti-theft manhole cover, characterized in that: The invention comprises a manhole cover assembly and an unlocking assembly, wherein the manhole cover assembly comprises a base (1), the inner surface of the base (1) is provided with three locking grooves (2), the inner side of the base (1) is also hinged with a manhole cover (3), a fixing column (4) is provided at the center of the bottom of the manhole cover (3), the bottom of the fixing column (4) is provided with a through groove (5) penetrating the upper surface of the manhole cover (3), a threaded sleeve (6) is rotatably mounted on the surface of the fixing column (4), the bottom end of the threaded sleeve (6) passes through the lower surface of the fixing column (4), and the protruding end is connected to a rotating block (7), the top of the rotating block (7) is provided with a through hole (8) penetrating therethrough, a plurality of limiting grooves (9) are arranged in an array on the inner wall of the through hole (8), three limiting sleeves (10) are provided at the bottom edge of the manhole cover assembly, and the limiting sleeves (10) are provided with a plurality of locking grooves (9) on the inner wall of the through hole (8), and the fixing sleeves (10) are provided with a plurality of locking grooves (10) on the inner wall of the through hole (8). A limit pin (11) is slidably installed on the inner side, and a movable ring (12) is threadedly connected to the outer surface of the threaded sleeve (6). Three connecting rods (13) are installed on the outer surface of the movable ring (12), and the other ends of the three connecting rods (13) are respectively connected to one end of each of the limit pins (11) close to the center of the manhole cover (3). The unlocking component includes a handle (14), a connecting rod (15) is arranged at the bottom of the handle (14), and an unlocking block (16) is arranged at the bottom end of the connecting rod (15). Two movable grooves (17) are symmetrically provided on the outer surface of the unlocking block (16), and a limit block (18) is slidably installed inside the movable groove (17), and the side of the limit block (18) away from the center of the unlocking block (16) passes through the surface of the unlocking block (16).

2. The anti-theft manhole cover according to claim 1, characterized in that: The hinged joint between the manhole cover (3) and the base (1) and the three limiting sleeves (10) are distributed in a circular array, and the three locking grooves (2) correspond to the positions of the three limiting pins (11) respectively.

3. The anti-theft manhole cover according to claim 1, characterized in that: A spring (19) is also installed inside the movable groove (17), and two ends of the spring (19) respectively abut against one side of the limiting block (18) close to the center of the unlocking block (16) and the inner wall of the limiting groove (9).

4. The anti-theft manhole cover according to claim 1, characterized in that: The portion of the limit block (18) that protrudes from the surface of the unlocking block (16) is in an arc shape, and the upper and lower ends are flush with the surface of the unlocking block (16).

5. The anti-theft manhole cover according to claim 1, characterized in that: The top and bottom ends of the through slot (5) are both provided with chamfers.

6. The anti-theft manhole cover according to claim 1, characterized in that: The unlocking block (16), the through slot (5) and the through hole (8) are compatible in shape and size.

Images