Square tongue with door lock and anti-saw

Abstract

This utility model discloses a square latch with anti-saw protection for door locks, specifically relating to the field of square latch technology. It includes a reinforcing sleeve with a reinforcing protective component. The reinforcing protective component includes an inner liner rod located in the middle of the reinforcing sleeve, with a keyhole in the middle of the inner liner rod. Threaded sleeves are provided on both sides of the reinforcing sleeve, and a limiting nut is fitted onto the reinforcing sleeve, with the limiting nut threadedly connected to the threaded sleeves. This utility model, through the nested design of the outer reinforcing sleeve and the inner liner rod, forms a double physical barrier. Compared to existing square latches made of a single material, it extends the time required to saw through the latch, significantly increasing the difficulty and time cost for thieves. Furthermore, the anti-slip teeth at the bottom of the limiting nut can be embedded into the lock body surface or groove, effectively preventing the limiting nut from being loosened by external force, ensuring a secure overall assembly of the square latch, and avoiding any impact on the locking effect due to loose components.

Description

Technical Field

[0001] This utility model relates to the field of door lock latch technology, and more specifically, this utility model relates to a door lock latch with anti-saw function. Background Technology

[0002] The square latch (also known as the "square bolt") is one of the core locking components of a door lock. It is usually a square columnar structure installed on the side of the lock body. After the door is closed, it automatically pops out and embeds into the door frame strike box, achieving basic locking of the door and preventing the door from being easily pushed open. It is different from the manually retractable "slant" (used for automatic guidance when closing the door) and is the main load-bearing and anti-pry component when the door is locked.

[0003] Currently, thieves often use hacksaws to directly cut off the exposed square latch. Once the square latch is cut off, the core locking structure of the door lock fails, and the door can be opened directly in just tens of seconds. This can easily cause property damage to the user. Therefore, a square latch with a door lock anti-saw function is provided. Utility Model Content

[0004] In order to overcome the above-mentioned defects of the prior art, the present invention provides a square tongue with a door lock and anti-saw function, which aims to solve the problems mentioned in the background art.

[0005] This utility model provides the following technical solution: a square tongue with a door lock and anti-saw, including a reinforcing sleeve, and the reinforcing sleeve is provided with a reinforcing protective component; The reinforced protective assembly includes an inner liner rod disposed in the middle of the reinforced sleeve, and a keyhole is provided in the middle of the inner liner rod; Both sides of the reinforcing sleeve are provided with threaded sleeves, and a limiting nut is fitted on the reinforcing sleeve, with the limiting nut being threadedly connected to the threaded sleeve.

[0006] Optionally, in a possible implementation, the bottom of the limiting nut is provided with a plurality of anti-slip teeth, the anti-slip teeth are fixed to the bottom of the limiting nut, a positioning slope is provided between the two threaded sleeves, the positioning slope is opened on the outside of the reinforcing sleeve, a locking rod is snapped into the bottom of the inner liner rod, one end of the locking rod is provided with a locking groove, and the locking rod is installed at the bottom of the inner liner rod by a limiting screw, a support ring is fitted on the top of the reinforcing sleeve, the support ring is slidably connected to the reinforcing sleeve by the positioning slope, a limiting cap is provided on the top of the support ring, and the limiting cap is fixed to the top of the inner liner rod; The technical effects and advantages of this utility model are as follows: By nesting the outer reinforcing sleeve and the inner liner rod, a double physical barrier is formed. Compared with the existing single-material square tongue, the time required for sawing can be extended, which greatly increases the difficulty and time cost for thieves to commit crimes. Meanwhile, the threaded engagement structure of the limit nut and the threaded sleeve can prevent the hacksaw from directly contacting the core body of the square tongue; the sliding function of the support ring along the positioning slope can dynamically adjust the position to avoid the saw blade from concentrating on the same area, further slowing down the sawing process and ensuring that the locking structure does not easily fail. Furthermore, the anti-slip teeth at the bottom of the limit nut can be embedded into the surface or groove of the lock body, effectively preventing the limit nut from being loosened by external force, ensuring that the square tongue is firmly assembled, and avoiding the locking effect being affected by loose parts. Attached Figure Description

[0007] To more clearly illustrate the technical solutions in this disclosure, the accompanying drawings used in some embodiments will be briefly described below. Obviously, the drawings described below are only drawings of some embodiments of this disclosure, and those skilled in the art can obtain other drawings based on these drawings. In addition, the drawings described below can be regarded as schematic diagrams and are not intended to limit the actual size of the product, the actual flow of the method, the actual timing of the signals, etc. involved in the embodiments of this disclosure.

[0008] Figure 1 This is a front view of the overall structure of this utility model.

[0009] Figure 2 This is a side view of the overall structure of this utility model.

[0010] Figure 3 This is a schematic diagram of the reinforcing sleeve, limiting nut, threaded sleeve, and support ring of this utility model.

[0011] Figure 4 This is a schematic diagram of the inner liner rod, the limiting cap, and the locking rod of this utility model.

[0012] The attached diagram is labeled as follows: 1. Reinforcing sleeve; 2. Inner liner rod; 3. Keyhole; 4. Locking rod; 5. Lock groove; 6. Threaded sleeve; 7. Limiting nut; 8. Support ring; 9. Limiting cap; 10. Anti-slip teeth; 11. Limiting screw. Detailed Implementation

[0013] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0014] This embodiment aims to elaborate in detail the specific structure, assembly process, and working principle of the square tongue with door lock and anti-saw mechanism of this utility model, in conjunction with the appendix. Figures 1-4The connection relationships and functions of each component are explained in detail to fully demonstrate its anti-saw reinforcement effect and solve the technical problem that the existing door lock tongue is easily cut off by a hacksaw, causing the lock to fail.

[0015] Example 1 The square latch with door lock anti-saw in this embodiment has a core structure including a reinforcing sleeve 1 and a reinforcing protective assembly mounted on it. The specifications, positions and connection relationships of each component are as follows: Reinforced Sleeve 1: As the outer protective layer of the square latch, it can be made of high-strength alloy material, with a hollow cylindrical structure. Its outer diameter is adapted to the mounting hole size of a standard door lock body, used to directly enclose the internal core components and resist external sawing forces, such as... Figure 1 , Figure 3 As shown.

[0016] Enhanced protection components: These are the core anti-sawing functional components, specifically including the following parts: Inner liner rod 2: Its diameter matches the hollow inner diameter of the reinforcing sleeve 1, and it is coaxially set in the central cavity of the reinforcing sleeve 1, forming a double-reinforced structure of outer sleeve and inner rod, thereby improving the overall anti-saw strength. Figure 1 , Figure 4 As shown.

[0017] Keyhole 3: Located at the center of the inner liner rod 2 along its axial direction, the hole diameter is adapted to the cross-sectional dimensions of the corresponding door lock key, used for key insertion to drive the lock rod 4 to extend and retract, thereby opening and locking the door. Figure 4 As shown.

[0018] Locking rod 4 and locking groove 5: One end of the locking rod 4 is fixedly connected to the bottom end of the inner liner rod 2 via a slot and a limiting screw. Specifically, the bottom end of the inner liner rod 2 has a slot adapted to the locking rod 4. After the locking rod 4 is inserted, the limiting screw 11 passes laterally through the corresponding screw holes of the inner liner rod 2 and the locking rod 4, achieving detachable fixing. The locking groove 5 is located on the side of the locking rod 4 away from the inner liner rod 2, and is used to cooperate with the lock cylinder paddle inside the door lock to drive the locking rod 4 to extend or retract. Figure 4 As shown.

[0019] Threaded sleeve 6 and limiting nut 7: There are two threaded sleeves 6, which can be made of high-strength copper alloy. They are welded and fixed to both ends of the outer wall of the reinforcing sleeve 1. The internal thread of the threaded sleeve 6 is compatible with the external thread of the limiting nut 7. There are two limiting nuts 7, which are fitted onto the outside of the reinforcing sleeve 1 and threadedly connected to the threaded sleeves 6. After tightening, the reinforcing sleeve 1 can be fixed to the mounting position of the door lock body. At the same time, its annular structure can prevent the hacksaw from directly contacting the main body of the reinforcing sleeve 1, forming the first anti-saw barrier. Figure 1 , Figure 3 As shown.

[0020] Anti-slip teeth 10: integrally formed or welded to the bottom of the limit nut 7. When the limit nut 7 is tightened, the anti-slip teeth 10 can be embedded into the corresponding groove of the lock body or press against the surface of the lock body to prevent the limit nut 7 from being loosened by external force, further improving assembly stability. Figure 2 As shown.

[0021] Positioning vertical slope and support ring 8: The positioning vertical slope is a strip-shaped inclined surface formed on the outer wall of the reinforcing sleeve 1; the support ring 8 is a ring structure, sleeved on the outer side of the reinforcing sleeve 1 and slidingly engaged with the positioning vertical slope. Its inner diameter is adapted to the outer diameter of the reinforcing sleeve 1 and the inclined surface size of the positioning vertical slope, and it can slide along the axial direction of the positioning vertical slope. This is used to adjust the force position of the reinforcing sleeve 1 by sliding when it is subjected to sawing force, avoiding local stress concentration that could lead to rapid sawing through. Figure 3 As shown.

[0022] Limiting cap 9: Made of the same high-strength alloy material as the reinforcing sleeve 1, it has a circular cap-shaped structure. Its inner diameter matches the outer diameter of the top end of the inner liner rod 2. It is fixed to the top end of the inner liner rod 2 by welding or threaded connection, and at the same time covers the top of the support ring 8. It is used to prevent the support ring 8 from slipping upward along the axial direction, ensuring that the support ring 8 is always fitted on the outside of the reinforcing sleeve 1 to play a protective role. Figure 1 , Figure 4 As shown.

[0023] Example 2 The assembly steps of the square tongue in this embodiment are as follows, as shown in the attached figure. Figure 1-4 As shown: First, coaxially insert the inner liner rod 2 into the central cavity of the reinforcing sleeve 1, ensuring that the top end of the inner liner rod 2 extends beyond the top end of the reinforcing sleeve 1. Figure 1 , Figure 4 As shown; Insert one end of the locking rod 4 into the slot at the bottom of the inner liner rod 2, align the screw holes of both, and screw in the limiting screw 11 to complete the fixing of the locking rod 4 and the inner liner rod 2. Figure 2 As shown; Insert the support ring 8 from the top of the reinforcing sleeve 1, ensuring its inner wall fits against the positioning slope on the outer side of the reinforcing sleeve 1, so that the support ring 8 can slide smoothly along the positioning slope. Figure 3 As shown; Secure the limiting cap 9 to the top of the inner liner rod 2, ensuring that the bottom of the limiting cap 9 presses firmly against the top of the support ring 8, preventing the support ring 8 from slipping out. Figure 1 , Figure 4 As shown; Place the limit nut 7 onto the reinforcing sleeve 1, connect it to the corresponding threaded sleeve 6, and tighten it clockwise until the anti-slip teeth 10 press against the lock body surface, or embed it into the lock body groove to complete the overall assembly. Figure 1 , Figure 2 As shown; The specific working principle is as follows: When closing the door, the lock cylinder plate inside the lock engages with the lock groove 5 of the lock rod 4, driving the lock rod 4 to extend and engage with the strike box of the door frame, thus achieving basic locking of the door; when opening the door, the key is inserted into the keyhole 3 of the inner rod 2, and turning the key drives the lock cylinder plate to retract the lock rod 4 into the reinforcing sleeve 1, thus releasing the lock. Figure 1 , Figure 4 As shown.

[0024] When a thief attempts to cut through the square tongue with a hacksaw, the first thing it contacts is the limit nut 7. Its ring structure and the threaded connection with the threaded sleeve 6 can prevent the saw blade from penetrating directly. At the same time, the anti-slip teeth 10 ensure that the limit nut 7 is not rotated and loosened, thus extending the time it takes to saw through the limit nut 7. After the saw blade breaks through the limit nut 7, it will come into contact with the outer protection of the reinforcing sleeve 1. The double metal layer structure of the reinforcing sleeve 1 and the inner liner rod 2 can greatly improve the anti-saw strength. During the sawing process, when the reinforcing sleeve 1 is subjected to sawing force, the support ring 8 can slide along the positioning vertical slope to adjust its own position to prevent the saw blade from continuously acting on the same position, thus avoiding localized rapid sawing and further improving the anti-saw effect. Even if the reinforcing sleeve 1 is partially sawn off, the inner liner rod 2 can still serve as the core load-bearing component, maintaining the basic locking function of the door lock, preventing the locking structure from failing directly, and giving the user time to sound an alarm or respond.

[0025] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. Square tongue with door lock anti-saw, comprising a reinforcing sleeve (1), characterized in that: The reinforcing sleeve (1) is provided with a reinforcing protective component; The reinforced protective assembly includes an inner liner rod (2) disposed in the middle of the reinforced sleeve (1), and a keyhole (3) is provided in the middle of the inner liner rod (2). Both sides of the reinforcing sleeve (1) are provided with threaded sleeves (6), and a limiting nut (7) is fitted on the reinforcing sleeve (1). The limiting nut (7) is threadedly connected to the threaded sleeve (6).

2. The anti-saw square lug with door lock according to claim 1, characterized in that: The bottom of the limiting nut (7) has a number of anti-slip teeth (10), which are fixed to the bottom of the limiting nut (7).

3. The anti-saw square lug with door lock according to claim 1, characterized in that: A positioning slope is provided between the two threaded sleeves (6), and the positioning slope is located on the outside of the reinforcing sleeve (1).

4. The anti-saw square lug with door lock according to claim 1, characterized in that: The bottom end of the inner lining rod (2) is fitted with a locking rod (4), one end of the locking rod (4) is provided with a locking groove (5), and the locking rod (4) is installed at the bottom of the inner lining rod (2) by a limiting screw (11).

5. The anti-saw square lug with door lock according to claim 3, characterized in that: The top of the reinforcing sleeve (1) is fitted with a support ring (8), which is slidably connected to the reinforcing sleeve (1) through a positioning vertical slope.

6. The square tongue with door lock anti-saw according to claim 3, characterized in that: The top of the support ring (8) is provided with a limit cap (9), which is fixed to the top of the inner liner rod (2).

Images