A well lid lock
By using a bent locking tongue and sleeve slot design, combined with locking components and a key structure, the problem of complex structure and poor anti-theft performance of existing manhole cover locks is solved, achieving efficient assembly and enhanced anti-theft performance.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHIJIAZHUANG JIANDUN LOCK IND CO LTD
- Filing Date
- 2025-03-18
- Publication Date
- 2026-06-02
AI Technical Summary
Existing manhole cover locks are complex in structure, costly, inefficient to assemble, and have poor anti-theft performance, making them easy to pry open with small sticks.
It adopts a bent latch structure and sleeve slot design, and enhances anti-theft performance by rotating the sleeve to the lock cylinder. Combined with the special structure of the locking components and key, it simplifies the assembly process.
It improves the anti-theft performance of manhole cover locks, reduces the possibility of the lock tongue being pried open, simplifies the assembly process, and reduces costs.
Smart Images
Figure CN224314752U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of manhole cover equipment technology, specifically a manhole cover lock. Background Technology
[0002] A manhole cover lock is a structure installed on a manhole cover to prevent its theft. Existing manhole cover locks consist of a lock cylinder mounted on the cover and a bolt rotated on the lock cylinder. Inserting a key rotates the bolt, causing it to hook onto or away from the manhole cover's edge, thus locking or unlocking the cover. However, the existing bolt and lock cylinder connection structure is complex, costly, and inefficient to assemble. Furthermore, the bolt can be easily pried open by inserting a small stick through the lock cylinder's keyhole, resulting in poor anti-theft performance. Utility Model Content
[0003] The technical problem to be solved by this utility model is to provide a manhole cover lock that can quickly assemble the bolt and the lock cylinder, and after assembly, the bolt and the lock cylinder are firmly connected, and the bolt is not easily moved by a stick.
[0004] To solve the above problems, the technical solution adopted by this utility model is as follows:
[0005] A manhole cover lock, comprising:
[0006] A lock cylinder is installed on the manhole cover. The lock cylinder has a vertically penetrating lock hole and an annular sleeve groove.
[0007] The latch assembly includes a sleeve fitted on the lock cylinder and a latch disposed on one side of the sleeve. A protruding component is provided at the upper end of the sleeve, and the protruding component is rotatably disposed in the sleeve groove. The latch is bent and its end is away from the sleeve, so that an anti-theft area is formed between the end of the latch and the sleeve.
[0008] A locking assembly is disposed between the sleeve and the well cover to restrict the rotation of the sleeve;
[0009] The key includes a shaft and a lever disposed at the end of the shaft, the end of the lever abutting against the end of the latch, and rotating the shaft causes the sleeve to rotate.
[0010] In one embodiment of this utility model, a bushing portion is integrally formed on the lower outer side of the lock cylinder, and a sleeve groove is formed between the upper end of the bushing portion and the well cover. Two vertical mounting grooves are symmetrically opened on the bushing portion, and the mounting grooves penetrate the bushing portion.
[0011] As one embodiment of this utility model, the upper inner side of the sleeve is provided with two sleeve bosses corresponding to the two mounting grooves, and the sleeve is slidably installed to the sleeve slot along the two mounting grooves through the two sleeve bosses.
[0012] The sleeve boss is slidably disposed in the sleeve slot so that the sleeve is rotatably connected to the lock cylinder.
[0013] In one embodiment of this utility model, a lock cylinder bushing is fitted on the lower outer side of the lock cylinder, and a sleeve groove is formed between the upper end of the lock cylinder bushing and the manhole cover. An annular sleeve flange is provided on the inner side of the upper end of the sleeve. After the sleeve is fitted onto the lock cylinder, the lock cylinder bushing is installed to limit the sleeve flange in the sleeve groove, thereby making the sleeve and the lock cylinder rotatably connected.
[0014] In one embodiment of this utility model, the sleeve, lock cylinder bushing, and lock cylinder are provided with through pin holes. After the lock cylinder bushing is installed in place, a bushing installation pin is inserted into the pin hole to fix the lock cylinder bushing and the lock cylinder.
[0015] As one embodiment of this utility model, a flange-shaped sleeve flange is provided on the outer side of the upper end of the sleeve, and an arc-shaped rotation limiting groove is provided on the sleeve flange. The rotation limiting groove is concentric with the rotation center of the sleeve, and a well cover pin hole is provided on the well cover corresponding to the rotation limiting groove.
[0016] After the protruding component is rotatably installed in the sleeve groove, a rotation limiting pin is inserted into the well cover pin hole. The rotation limiting pin abuts against the end of the rotation limiting groove, thereby limiting the rotation stroke of the sleeve.
[0017] In one embodiment of this utility model, two spring chambers are symmetrically arranged on both sides of the upper end of the sleeve, and a receiving groove is opened at the upper end of the spring chamber. The locking assembly includes two symmetrically arranged locking components. The locking component includes a compression spring disposed in the receiving groove and a ball slidably disposed in the receiving groove. The compression spring drives the ball to press against the manhole cover. When the sleeve rotates, the ball moves along the lower end face of the manhole cover.
[0018] The manhole cover has a hemispherical locking hole corresponding to the ball bearing. The ball bearing moves into the locking hole to indicate that the sleeve is rotated into place.
[0019] As one embodiment of this utility model, the latch includes a latch connecting rod inclinedly disposed on one side of the sleeve and a key receiving rod disposed at the end of the latch connecting rod. A key slot is provided on the key receiving rod corresponding to the end of the lever. After the key is installed in place, the end of the lever is locked in the key slot.
[0020] The anti-theft zone is formed between the latch connecting rod, the key receiving rod, and the side wall of the sleeve.
[0021] In one embodiment of this utility model, the key slot has an opening, which is an inverted V-shape for receiving and guiding the lever.
[0022] As one embodiment of the present utility model, a lock hole groove is provided on one side of the lock hole, and a shaft boss is provided on the shaft corresponding to the lock hole groove;
[0023] The relative positions between the shaft boss and the lever and the relative positions between the lock hole groove and the lock tongue correspond to each other;
[0024] The lower part of the lock hole is provided with a relief groove corresponding to the rotation path of the shaft boss. The relief groove is fan-shaped, and its curvature corresponds to the rotation path of the lock tongue. The length of the relief groove in the axial direction of the lock cylinder corresponds to the length of the shaft boss in the axial direction of the lock cylinder.
[0025] The beneficial effects of adopting the above technical solution are as follows:
[0026] This application uses a bent latch structure to keep the contact point between the latch and the key paddle away from the lock cylinder, reducing the possibility of the latch being paddled by a small stick and increasing the anti-theft performance of the manhole cover lock; at the same time, the depth of the clearance groove in the keyhole corresponds to the length of the shaft boss on the key shaft, further increasing the anti-theft effect.
[0027] This application forms a sleeve groove by means of a detachable lock cylinder bushing or an integrally formed bushing part and the gap between the sleeve and the well cover. The sleeve of the lock tongue assembly is rotatably set in the sleeve groove by the inner edge of the sleeve or the sleeve boss, realizing the rotational connection between the sleeve and the lock cylinder. The structure is simple and the assembly efficiency is high. Attached Figure Description
[0028] Figure 1 This is a schematic diagram of the structure of Example 1.
[0029] Figure 2 This is a structural schematic diagram from another angle of Embodiment 1.
[0030] Figure 3 This is a structural schematic diagram of the manhole cover, lock cylinder, and lock tongue assembly of Embodiment 1.
[0031] Figure 4 This is a schematic diagram of the lock tongue assembly after it is separated from the lock cylinder in Embodiment 1.
[0032] Figure 5 This is a structural schematic diagram of the bolt assembly and the lock cylinder from another angle in Embodiment 1.
[0033] Figure 6 This is a half-sectional structural diagram of the latch assembly in Embodiment 1.
[0034] Figure 7 This is a schematic diagram of the structure after the key is removed in Example 1.
[0035] Figure 8 This is a schematic diagram of the keyhole structure in Example 1.
[0036] Figure 9 This is a schematic diagram of the manhole cover, lock cylinder, and lock tongue assembly in Example 2.
[0037] Figure 10 This is a structural schematic diagram of the manhole cover, lock cylinder, and lock tongue assembly from another angle in Embodiment 2.
[0038] Among them: 100 manhole cover; 100-1 manhole cover pin hole; 100-2 locking hole;
[0039] 101 Lock cylinder; 101-1 Lock hole; 101-2 Lock hole protrusion; 101-3 Clearance groove;
[0040] 102 Lock cylinder bushing;
[0041] 103 Bushing section; 103-1 Mounting slot;
[0042] 200 Locking tongue assembly; 201 Sleeve; 202 Sleeve flange; 202-1 Rotary limiting groove;
[0043] 203 Locking tongue; 203-1 Locking tongue connecting rod; 203-2 Key receiving rod; 203-3 Key slot; 203-4 Slot opening;
[0044] 204 Spring housing; 204-1 Receiving groove; 205 Inner edge of sleeve; 206 Sleeve boss;
[0045] 300 Key; 301 Shaft; 302 Lever; 303 Torsion bar; 304 Shaft boss; 305 Limiting boss;
[0046] 400° Rotary limit pin; 500° Bushing mounting pin; 600° Ball bearing; 700° Compression spring;
[0047] a. Anti-theft zone; b. Sleeve slot. Detailed Implementation
[0048] To make the objectives, technical solutions and advantages of this utility model clearer, the utility model will be clearly and completely described below in conjunction with specific embodiments.
[0049] Example 1:
[0050] like Figures 1 to 8 The manhole cover lock shown includes:
[0051] A lock cylinder 101 is provided on the manhole cover 100. The lock cylinder 101 is provided with a vertically penetrating lock hole 101-1 and an annular sleeve groove b.
[0052] The latch assembly 200 includes a sleeve 201 sleeved on the lock cylinder 101 and a latch 203 disposed on one side of the sleeve 201. The upper end of the sleeve 201 is provided with a protruding component, which is rotatably disposed in the sleeve groove b. The latch 203 is bent, and its end is away from the sleeve 201, so that an anti-theft area a is formed between the end of the latch 203 and the sleeve 201.
[0053] A locking assembly is disposed between the sleeve 201 and the manhole cover 100 to restrict the rotation of the sleeve 201;
[0054] The key 300 includes a shaft 301 and a lever 302 disposed at the end of the shaft 301. The end of the lever 302 abuts against the end of the latch 203. Rotating the shaft 301 causes the sleeve 201 to rotate.
[0055] In this embodiment, when inserting the key 300, the lever 302 is first inserted into the lock hole 101, and then the shaft 301 is rotated so that the shaft 301 enters the lock hole 101 to complete the insertion of the key 300.
[0056] See Figure 4 A lock cylinder bushing 102 is fitted on the lower outer side of the lock cylinder 101. The upper end of the lock cylinder bushing 102 forms the sleeve groove b between it and the manhole cover 100. An annular sleeve flange 202 is provided on the inner side of the upper end of the sleeve 201. After the sleeve 201 is fitted onto the lock cylinder 101, the lock cylinder bushing 102 is installed to limit the sleeve flange 202 in the sleeve groove b, thereby making the sleeve 201 and the lock cylinder 101 rotatably connected.
[0057] See Figures 2 to 5The sleeve 201, the lock cylinder bushing 102 and the lock cylinder 101 are provided with through pin holes. After the lock cylinder bushing 102 is installed in place, the lock cylinder bushing 102 and the lock cylinder 101 are fixedly connected by inserting a bushing installation pin 500 into the pin hole.
[0058] See Figures 2 to 5 The upper outer side of the sleeve 201 is provided with a flange-shaped sleeve flange 202. The sleeve flange 202 has an arc-shaped rotation limiting groove 202-1, which is concentric with the rotation center of the sleeve 201. The manhole cover 100 has a manhole cover pin hole 100-1 corresponding to the rotation limiting groove 202-1. After the protruding assembly is rotatably installed in the sleeve groove b, a rotation limiting pin 400 is inserted into the manhole cover pin hole 100-1. The rotation limiting pin 400 abuts against the end of the rotation limiting groove 202-1, thereby limiting the rotation stroke of the sleeve 201.
[0059] See details Figure 6 Two spring chambers 204 are symmetrically arranged on both sides of the upper end of the sleeve 201. The upper end of each spring chamber 204 has a receiving groove 204-1. The locking assembly includes two symmetrically arranged locking components. Each locking component includes a compression spring 700 disposed within the receiving groove 204-1 and a ball bearing 600 slidably disposed within the receiving groove 204-1. The compression spring 700 drives the ball bearing 600 to press against the manhole cover 100. When the sleeve 201 rotates, the ball bearing 600 moves along the lower end face of the manhole cover. (See also...) Figure 4 and Figure 8 The manhole cover 100 has a hemispherical locking hole 100-2 corresponding to the ball bearing 600. The ball bearing 600 moves into the locking hole 100-2 to generate a snapping sensation, thereby indicating that the sleeve 201 rotates into place.
[0060] See Figure 2 , Figure 3 and Figure 6 The latch 203 includes a latch connecting rod 203-1 inclinedly disposed on one side of the sleeve 201 and a key receiving rod 203-2 disposed at the end of the latch connecting rod 203-1. A key slot 203-3 is provided on the key receiving rod 203-2 corresponding to the end of the lever 302. After the key 300 is installed, the end of the lever 302 is engaged in the key slot 203-3. The anti-theft area a is formed between the latch connecting rod 203-1, the key receiving rod 203-2, and the side wall of the sleeve 201.
[0061] See Figure 4 , Figure 6 and Figure 7The key slot 203-3 has a slot opening 203-4, which is an inverted V-shape to receive and guide the lever 302. A lock hole groove 101-2 is provided on one side of the lock hole 101-1, and a shaft boss 304 is provided on the shaft 301 corresponding to the lock hole groove 101-2. The relative position between the shaft boss 304 and the lever 302 corresponds to the relative position between the lock hole groove 101-2 and the bolt 203. When the operator inserts the key 300, the shaft boss 304 is first aligned with the lock hole groove 101-2, so that the position of the lever 302 after insertion is aligned with the position of the bolt 203, ensuring that the end of the lever 302 is inserted into the key slot 203-3 after the key is inserted.
[0062] The lower part of the lock hole 101-1 is provided with a relief groove 101-3 corresponding to the rotation path of the shaft boss 304. The relief groove 101-3 is fan-shaped, and its curvature corresponds to the rotation path of the bolt 203. The length of the relief groove 101-3 in the axial direction of the lock cylinder 101 corresponds to the length of the shaft boss 304 in the axial direction of the lock cylinder 101. This is to prevent the lock hole protrusion 101-2 from interfering with the rotation of the shaft boss 304 during the rotation of the key 300.
[0063] See Figure 1 , Figure 2 and Figure 7 In this embodiment, a torsion bar 303 is provided at the upper end of the shaft 301, which makes it easier to turn the key 300. A limiting boss 305 is also provided in the middle of the shaft 301. After the key 300 is inserted, the limiting boss 305 abuts against the upper end of the lock cylinder 101 to prevent the key 300 from falling and to disengage the end of the lever 302 from the key slot 203-3.
[0064] Example 2:
[0065] Combination Figure 1 , Figure 2 , Figure 7 , Figure 9 and Figure 10The main difference between this embodiment and Embodiment 1 is that a bushing portion 103 is integrally formed on the lower outer side of the lock cylinder 101. The upper end of the bushing portion 103 forms the sleeve groove b between it and the manhole cover 100. Two vertical mounting grooves 103-1 are symmetrically formed on the bushing portion 103, penetrating through it. Two sleeve bosses 206 are provided on the upper inner side of the sleeve 201 corresponding to the two mounting grooves 103-1. The sleeve 201 is slidably installed into the sleeve groove b along the two mounting grooves 103-1 via the two sleeve bosses 206. The sleeve bosses 206 are slidably disposed within the sleeve groove b to allow the sleeve 201 to be rotatably connected to the lock cylinder 101. A rotating limiting pin 400 ensures that the rotation path of the latch assembly avoids the opening position of the mounting grooves 103-1 during use, thus preventing the sleeve 201 and lock cylinder 101 from disengaging. In this embodiment, the bushing part 103 is integrally molded, which further reduces the components of the manhole cover lock and makes the assembly of the manhole cover lock more convenient and faster.
[0066] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims
1. A manhole cover lock, characterized in that, It includes: A lock cylinder (101) is provided on the manhole cover (100). The lock cylinder (101) is provided with a vertically penetrating lock hole (101-1) and an annular sleeve groove (b). The latch assembly (200) includes a sleeve (201) sleeved on the lock cylinder (101) and a latch (203) disposed on one side of the sleeve (201). The upper end of the sleeve (201) is provided with a protruding component, which is rotatably disposed in the sleeve groove (b). The latch (203) is bent, and its end is away from the sleeve (201), so that an anti-theft area (a) is formed between the end of the latch (203) and the sleeve (201). A locking assembly is disposed between the sleeve (201) and the manhole cover (100) for restricting the rotation of the sleeve (201); The key (300) includes a shaft (301) and a lever (302) disposed at the end of the shaft (301), the end of the lever (302) abutting against the end of the latch (203), and rotating the shaft (301) to rotate the sleeve (201).
2. A manhole cover lock according to claim 1, characterized in that, The lower outer side of the lock core (101) is integrally formed with a bushing part (103). The upper end of the bushing part (103) and the well cover (100) form the sleeve groove (b). Two vertical mounting grooves (103-1) are symmetrically opened on the bushing part (103), and the mounting grooves (103-1) penetrate the bushing part (103).
3. A manhole cover lock according to claim 2, characterized in that, The upper inner side of the sleeve (201) is provided with two sleeve bosses (206) corresponding to the two mounting grooves (103-1). The sleeve (201) is slidably installed to the sleeve slot (b) along the two mounting grooves (103-1) through the two sleeve bosses (206). The sleeve boss (206) is slidably disposed in the sleeve slot (b) so that the sleeve (201) is rotatably connected to the lock cylinder (101).
4. A manhole cover lock according to claim 1, characterized in that, A lock cylinder bushing (102) is fitted on the lower outer side of the lock cylinder (101). The upper end of the lock cylinder bushing (102) forms the sleeve groove (b) between the upper end of the lock cylinder bushing (102) and the manhole cover (100). An annular sleeve flange (202) is provided on the inner side of the upper end of the sleeve (201). After the sleeve (201) is fitted onto the lock cylinder (101), the lock cylinder bushing (102) is installed to limit the sleeve flange (202) in the sleeve groove (b), thereby making the sleeve (201) and the lock cylinder (101) rotatably connected.
5. A manhole cover lock according to claim 4, characterized in that, The sleeve (201), lock cylinder bushing (102) and lock cylinder (101) are provided with through pin holes. After the lock cylinder bushing (102) is installed in place, the lock cylinder bushing (102) and lock cylinder (101) are fixedly connected by inserting a bushing installation pin (500) into the pin hole.
6. A manhole cover lock according to claim 1, characterized in that, The upper outer side of the sleeve (201) is provided with a flange-shaped sleeve flange (202), and an arc-shaped rotation limiting groove (202-1) is provided on the sleeve flange (202). The rotation limiting groove (202-1) is concentric with the rotation center of the sleeve (201). The well cover (100) is provided with a well cover pin hole (100-1) corresponding to the rotation limiting groove (202-1). After the protruding component is rotatably disposed in the sleeve groove (b), a rotation limiting pin (400) is inserted into the well cover pin hole (100-1). The rotation limiting pin (400) abuts against the end of the rotation limiting groove (202-1) to limit the rotation stroke of the sleeve (201).
7. A manhole cover lock according to claim 1, characterized in that, Two spring chambers (204) are symmetrically arranged on both sides of the upper end of the sleeve (201). The upper end of the spring chamber (204) is provided with a receiving groove (204-1). The locking assembly includes two symmetrically arranged locking components. The locking component includes a compression spring (700) disposed in the receiving groove (204-1) and a ball (600) slidably disposed in the receiving groove (204-1). The compression spring (700) drives the ball (600) to press against the manhole cover (100). When the sleeve (201) rotates, the ball (600) moves along the lower end face of the manhole cover. The manhole cover (100) has a hemispherical locking hole (100-2) corresponding to the ball (600). The ball (600) moves into the locking hole (100-2) to indicate that the sleeve (201) is rotated into place.
8. A manhole cover lock according to claim 1, characterized in that, The latch (203) includes a latch connecting rod (203-1) inclinedly disposed on one side of the sleeve (201) and a key receiving rod (203-2) disposed at the end of the latch connecting rod (203-1). The key receiving rod (203-2) is provided with a key slot (203-3) corresponding to the end of the lever (302). After the key (300) is installed in place, the end of the lever (302) is locked in the key slot (203-3). The anti-theft area (a) is formed between the side wall of the latch connecting rod (203-1), the key receiving rod (203-2), and the sleeve (201).
9. A manhole cover lock according to claim 8, characterized in that, The key slot (203-3) has a slot opening (203-4), which is an inverted V-shape for receiving and guiding the lever (302).
10. A manhole cover lock according to claim 1, characterized in that, A lock hole groove (101-2) is provided on one side of the lock hole (101-1), and a shaft boss (304) is provided on the shaft (301) corresponding to the lock hole groove (101-2). The relative positions between the shaft boss (304) and the lever (302) correspond to the relative positions between the lock hole protrusion (101-2) and the lock tongue (203); The lower part of the lock hole (101-1) is provided with a relief groove (101-3) corresponding to the rotation path of the shaft boss (304). The relief groove (101-3) is fan-shaped, and its curvature corresponds to the rotation path of the lock tongue (203). The length of the relief groove (101-3) in the axial direction of the lock cylinder (101) corresponds to the length of the shaft boss (304) in the axial direction of the lock cylinder (101).