A security lock and a door frame having the same.

Abstract

This utility model discloses a security lock cylinder and a door frame incorporating it. Its most significant advantage lies in the fact that by designing the lock cylinder body to move independently up and down relative to the door, and integrating locking and limiting functions into the lock cylinder body, the opening operation is simplified to two consecutive actions: unlocking and lifting. The user only needs to lift the lightweight lock cylinder body to release all limits, completely avoiding the heavy burden of lifting the entire door frame in traditional designs. This makes operation extremely easy, greatly improving the convenience of daily passage and significantly enhancing the user experience. Simultaneously, this design maintains the passive anti-accidental opening function provided by the limiting mechanism in the locked state, ensuring that security is not compromised despite the simplified operation. Furthermore, the lock cylinder has a compact structure, strong adaptability, and can be flexibly applied to various door frame products, exhibiting good versatility and practicality.

Description

Technical Field

[0001] This utility model relates to the field of home security technology, and in particular to a security lock and a door frame having the same. Background Technology

[0002] Currently, safety gates are widely used in homes to block passageways and prevent children or pets from passing through unnecessarily. These gates typically consist of a swing gate and a fixed frame or bracket, with a lock mechanism to lock the swing gate in the closed position.

[0003] Existing security door lock designs, in pursuit of higher security, generally employ a structure with a double lock or an anti-accidental opening mechanism. For example, the user first needs to operate the main lock (e.g., press a button or turn a knob) to release the main lock; then, the entire movable door is lifted upwards to a certain height, so that the lock part passes over the double lock latch, limit post, or similar obstacle structure set on the fixed frame; only after this can the movable door be swung open.

[0004] This two-step unlocking and then pulling mechanism, while effectively improving the prevention of accidental opening, introduces a significant operational burden in actual daily use. Because the entire door needs to be lifted, the movement is substantial and requires considerable force. In common scenarios, such as when a user's hand is occupied, they are holding a young child, or are performing other immediate tasks, this lifting action is often inconvenient, affecting the smoothness and convenience of passage. Therefore, while ensuring safety and security, reducing the user's operational burden and improving the user experience has become a noteworthy and urgent practical problem in this field. Utility Model Content

[0005] The main purpose of this utility model is to propose a safety lock head and a door stop with it, which aims to maintain the safety performance of preventing accidental opening while reducing the user's operating load and improving the user experience.

[0006] To achieve the above objectives, this utility model proposes a safety lock head, adapted for use with door frames, characterized in that it comprises:

[0007] A lock body for mounting to the movable door of the gate frame;

[0008] The lock body can move vertically relative to the movable door and has an upper position and a lower position;

[0009] The lock body is equipped with a locking mechanism and a limiting mechanism;

[0010] The locking mechanism is used to lock or unlock with the fixing frame of the gate;

[0011] The limiting mechanism is used to limit the lock body when it is in the lower position and to form a limit with the fixing frame;

[0012] When the locking mechanism is in the unlocked state and the lock body is in the upper position, the limiting mechanism is in the released limiting state, thereby allowing the movable door to be opened.

[0013] Preferably, the lock body is slidably mounted on the movable door; or,

[0014] The lock body includes a fixed part and a movable part. The fixed part is used to install on the movable door. The movable part and the fixed part are connected to each other vertically. The locking mechanism and the limiting mechanism are disposed on the movable part.

[0015] Preferably, the locking mechanism is a push-button structure, including a button, a latch, and a first elastic element;

[0016] The latch is used to extend into the lock groove on the fixing frame of the gate when locked;

[0017] The button is used to drive the bolt out of the lock groove when pressed, so as to release the lock between the movable door and the fixed frame;

[0018] The first elastic element is used to provide elastic force to the bolt, causing the bolt to tend to extend outside the lock body.

[0019] Preferably, there are two buttons, which are symmetrically arranged on both sides of the lock body;

[0020] The button and the latch are guided and engaged by a beveled surface;

[0021] When any of the buttons is pressed, the bolt is retracted into the lock body by the inclined surface to release the lock.

[0022] When the button is released, the elastic force provided by the first elastic element drives the latch to extend and simultaneously resets the button.

[0023] Preferably, the limiting mechanism includes a limiting groove and a limiting member, as well as a second elastic member that provides a protruding tendency for the limiting member;

[0024] The limiting groove is provided on the lock body, the limiting member is provided on the fixing frame of the door frame, and the bottom wall of the limiting groove is a first guiding slope; or,

[0025] The limiting member is provided on the lock head body, the limiting groove is provided on the fixing frame, and the top wall of the limiting groove is a second guide slope.

[0026] When the lock body is in the lower position, the limiting member engages with the limiting groove to form a limiting position;

[0027] When the lock body moves upward, the limiting member is driven to retract under the guidance of the first or second guide slope, thereby releasing the limiting between the movable door and the fixed frame.

[0028] Preferably, the limiting mechanism further includes:

[0029] Connector, used for linkage and cooperation with the lock body;

[0030] The telescopic component is movably installed within the connector;

[0031] A third elastic element is used to provide an elastic force to the telescopic element, giving it a tendency to extend.

[0032] A limiting hole with an open top is provided on the fixing frame;

[0033] When the lock body is in the lower position, the telescopic member engages with the limiting hole to form a limit;

[0034] When the lock body moves upward, the connecting member moves accordingly, causing the telescopic member to rise synchronously, so that the telescopic member exits from the top opening of the limiting hole, thereby releasing the limiting.

[0035] Preferably, it also includes a connecting rod;

[0036] The upper end of the connecting rod is fixedly connected to the lock body, and the connector is fixed to the connecting rod.

[0037] Preferably, it also includes a base;

[0038] The base is used to fix the movable door and has an opening at the top for inserting holes;

[0039] The lower end of the connecting rod is movably inserted into the socket.

[0040] This utility model also proposes a door threshold, comprising:

[0041] A movable door, one side of which is rotatably connected to the side of the door frame mounting position;

[0042] A mounting bracket is used to secure the door frame to the other side of its installation location.

[0043] And the aforementioned security lock;

[0044] The lock body is installed on the movable door;

[0045] The fixing frame is provided with a locking groove that cooperates with the locking mechanism, and a mating part for forming a limiting cooperation with the limiting mechanism;

[0046] The safety lock head locks the movable door in the closed position by locking the locking mechanism with the lock groove and by limiting the limiting mechanism with the mating part;

[0047] When the locking mechanism is unlocked, the lock body can move upward relative to the movable door. When the lock body is in the upper position, the limiting mechanism is in the released state, thereby allowing the movable door to be opened.

[0048] Preferably, when the safety lock head includes a connecting rod and a base, the movable door has an upper protrusion and a lower protrusion on the side facing the fixed frame;

[0049] The lock body is mounted on the upper protrusion;

[0050] The base is mounted on the lower protrusion;

[0051] The connecting rod is located between the upper protrusion and the lower protrusion. The upper end of the connecting rod is connected to the lock body, and the lower end of the connecting rod is movably inserted into the socket of the base.

[0052] The most significant advantage of this invention lies in its design allowing the lock body to move independently up and down relative to the door, integrating locking and limiting functions into the lock body. This simplifies the door-opening operation into two consecutive actions: unlocking and lifting. Users only need to lift the lightweight lock body to release all limits, completely eliminating the heavy burden of lifting the entire door in traditional designs. This greatly enhances the convenience of daily passage and significantly improves the user experience. Simultaneously, this design maintains the passive anti-accidental opening function provided by the limiting mechanism in the locked state, ensuring that security is not compromised despite the simplified operation. Furthermore, the lock body has a compact structure, strong adaptability, and can be flexibly applied to various door and gate products, demonstrating excellent versatility and practicality. Attached Figure Description

[0053] Figure 1 This is a schematic diagram of the appearance of a security lock head;

[0054] Figure 2 An exploded view of a security lock cylinder;

[0055] Figure 3 This is an exterior view of the gate / fence.

[0056] Figure 4 This is a cross-sectional view with the active part in the upper position;

[0057] Figure 5 This is a cross-sectional view of the telescopic component after it has exited the limiting hole. Detailed Implementation

[0058] The technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this utility model.

[0059] It should be noted that if any directional indication (such as up, down, left, right, front, back, top, bottom, inside, outside, vertical, horizontal, longitudinal, counterclockwise, clockwise, circumferential, radial, axial, etc.) is involved in the embodiments of this utility model, the directional indication is only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0060] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," such descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0061] This utility model proposes a safety protection lock head.

[0062] In this embodiment of the utility model, such as Figures 1 to 5 As shown, the security lock includes a lock body 1. The lock body 1 is used to be installed on the movable door 3 of the door frame and can move vertically relative to the movable door 3, and has an upper position and a lower position, both of which are within the range of movement of the lock body 1. A locking mechanism and a limiting mechanism are integrated on the lock body 1.

[0063] The locking mechanism is used to form a releasable locking relationship with the fixing frame 4 installed on the other side of the door frame. For example, the fixing frame 4 is provided with a lock groove 100, and the locking tongue 14 of the locking mechanism can extend into the lock groove 100 to achieve locking. By operating the locking mechanism, the locking tongue 14 can be disengaged from the lock groove 100 to release the lock.

[0064] The limiting mechanism is used to form a releasable limiting relationship with the fixing frame 4 when the lock body 1 is in the lower position. This limiting relationship provides an additional safety protection when the locking mechanism is engaged, preventing the movable door 3 from being easily opened due to accidental contact or other reasons. When the locking mechanism is in the unlocked state and the lock body 1 is in the upper position, the limiting mechanism is in the released state, thereby allowing the movable door 3 to be opened.

[0065] Compared to the traditional solution that requires lifting the entire movable door 3 to unlock the double lock, this solution only requires lifting the very light lock body 1, making the operation easier and more convenient, greatly reducing the user's workload and improving the user experience.

[0066] Specifically, based on the above embodiments, two specific implementation methods are provided for the movement of the lock body 1 relative to the movable door 3.

[0067] The first method involves directly mounting the entire lock body 1 onto the movable door 3 via guide rails, tracks, or other structures, allowing it to slide up and down. In this case, the lock body 1 moves up and down as a single unit.

[0068] The second method: The lock body 1 itself consists of a fixed part 11 and a movable part 12. The fixed part 11 is used to fix it to the movable door 3. The movable part 12 is connected to the fixed part 11 through a sliding joint or other structure, so that the movable part 12 can move up and down relative to the fixed part 11. In this case, both the locking mechanism and the limiting mechanism are provided on the movable part 12. During operation, the user lifts the movable part 12, while the fixed part 11 remains stationary.

[0069] Specifically, as a preferred embodiment, the locking mechanism is a push-button type. It mainly includes a button 13, a locking tongue 14, and a first elastic element 15.

[0070] The latch 14 extends into the corresponding lock groove 100 on the door frame 4 in the locked state. The button 13 is for user operation by pressing. The button 13 and the latch 14 are connected via a transmission structure such as a beveled guide. When the user presses the button 13, the beveled guide drives the latch 14 to overcome the elastic force of the first elastic element 15, retracting it into the lock body 1, thus disengaging it from the lock groove 100 of the frame 4 and releasing the main lock between the movable door 3 and the frame 4. When the button 13 is released, the first elastic element 15 releases its stored elastic potential energy, causing the latch 14 to extend again, returning to the lockable state, and also typically resetting the button 13. The elastic force provided by the first elastic element 15 gives the latch 14 the characteristic of automatically extending and maintaining its extension tendency, ensuring automatic lock recovery capability. Furthermore, the ease of operation and symmetry of the locking mechanism can be further optimized.

[0071] Preferably, two buttons 13 are provided and symmetrically arranged on the front and rear sides of the lock body 1. This dual-button design allows the user to unlock from either side, making it more user-friendly. The user can also grasp the lock body 1, press both buttons 13 simultaneously, and then lift the lock body 1, providing an excellent user experience. Both buttons 13 are guided and engaged with different parts of the bolt 14 via beveled surfaces. When either button 13 is pressed, the bolt 14 retracts due to the beveled surface, thus unlocking the lock. Releasing the button 13 causes the bolt 14 to extend under the action of the first elastic element 15, resetting the button 13.

[0072] It should be further explained that the number and target of the first elastic element 15 mentioned in the foregoing embodiments can be flexibly configured according to the structural design requirements during specific implementation. In one configuration, only one first elastic element 15 may be provided, which acts specifically on the latch 14 to provide it with the elastic force for extension and reset, while the reset of the button 13 can be achieved by the guide of the inclined surface. In another configuration, multiple first elastic elements 15 may be provided, one of which acts specifically on the latch 14 to provide its extension force, while the remaining one or more act on the corresponding button 13, specifically to provide the reset elastic force after the button 13 is pressed.

[0073] Specifically, the limiting mechanism mainly includes a limiting groove 21, a limiting member 22, and a second elastic member 23 that provides an elastic extension tendency for the limiting member 22. Its arrangement can be in two ways:

[0074] The first arrangement involves placing the limiting groove 21 on the lock body 1 and the limiting member 22 on the door frame 4. In this case, the bottom wall of the limiting groove 21, which is the wall surface that will contact the limiting member 22 when it moves upward, is designed as a first guide slope.

[0075] The second arrangement involves placing the limiting member 22 on the lock body 1 and the limiting groove 21 on the door frame 4. In this case, the top wall of the limiting groove 21, which is the wall surface that the limiting member 22 will contact when the lock body 1 moves upward, is designed as a second guide slope.

[0076] When the lock body 1 is in the lower position, i.e., the door is closed and locked, the limiting member 22, under the action of the second elastic member 23, engages with the limiting groove 21 to form a limit, preventing the movable door 3 from being opened accidentally. When the lock body 1 moves upward, under the guidance of the first or second guide slope, the moving part and the limiting member 22 on the stationary part move relative to each other. The slope forces the limiting member 22 to retract against the elastic force of the second elastic member 23, thereby automatically and passively releasing the engagement, i.e., releasing the limit between the movable door 3 and the fixed frame 4. This process requires no additional operation and is automatically completed along with the upward movement of the lock body 1.

[0077] Specifically, the limiting mechanism further includes a connector 24, a telescopic member 25, and a third elastic member 26. The connector 24 is linked and cooperates with the lock head body 1. The telescopic member 25 is movably installed within the connector 24, for example, it can slide telescopically within the connector 24. The third elastic member 26 is used to provide elastic force to the telescopic member 25, giving the telescopic member 25 a tendency to extend outward.

[0078] A limiting hole 27 with an open top is provided on the fixing bracket 4 of the gate.

[0079] When the lock body 1 is in the lower position, the telescopic member 25 extends under the action of the third elastic member 26 and inserts into the limiting hole 27 on the fixing frame 4, forming an auxiliary limiting position. When the lock body 1 moves upward, the connecting member 24 rises accordingly, driving the telescopic member 25 to rise as well, causing the telescopic member 25 to exit from the top opening of the limiting hole 27, thereby releasing the auxiliary limiting position. When closing the door, the end of the telescopic member 25 will first contact the wall around the limiting hole 27, be pushed and compressed by the third elastic member 26 and retract into the connecting member 24. When the movable door 3 is closed in place and the telescopic member 25 is aligned with the limiting hole 27, the telescopic member 25 quickly extends again under the drive of the third elastic member 26, inserts into the limiting hole 27, and automatically restores the auxiliary limiting position.

[0080] Specifically, it also includes a connecting rod 28. The upper end of the connecting rod 28 is fixedly connected to the lock body 1, specifically by passing through the fixed part 11 and then being fixedly connected to the movable part 12. The connecting member 24 is fixedly installed on the connecting rod 28. This structure makes the linkage between the connecting member 24 and the lock body 1 more direct and stable. At the same time, the movable passage structure of the connecting rod 28 and the fixed part 11 forms the sliding pair required for the movable connection between the movable part 12 and the fixed part 11.

[0081] Specifically, this embodiment further improves the aesthetics and stability of the overall structure:

[0082] A base 29 is added. This base 29 is used for fixed installation on the movable door 3. The base 29 has an open-top insertion hole 200. The lower end of the connecting rod 28 is movably inserted into the insertion hole 200 of the base 29. The base 29 not only guides and accommodates the lower end of the connecting rod 28, making the appearance neater, but also provides a lower support point for the entire lock head and connecting rod 28 assembly, increasing stability.

[0083] Specifically, the first elastic element 15, the second elastic element 23, and the third elastic element 26 are springs.

[0084] This utility model also proposes a door frame.

[0085] The gate includes a movable door 3, a fixed frame 4, and a safety lock as described in any of the preceding embodiments. One side of the movable door 3 is rotatably connected to one side of the gate installation location, such as a wall or door frame. The fixed frame 4 is fixedly installed on the other side of the gate installation location. The lock body 1 of the safety lock is installed on the movable door 3. The fixed frame 4 is provided with a lock groove 100 that cooperates with the locking mechanism and a mating part for forming a limiting cooperation with the limiting mechanism, wherein the mating part is the limiting groove 21 or the limiting member 22.

[0086] The working principle of this door is as follows: In the closed state, the locking mechanism's bolt 14 extends into the lock groove 100 of the fixed frame 4 to achieve primary locking. At the same time, the limiting mechanism cooperates with the fixed frame 4 to form an anti-accidental opening limit. When opening the door, the user operates the locking mechanism, such as pressing button 13 to release the primary lock, and simultaneously or subsequently lifts the lock body 1 upwards to release the limit cooperation, thus smoothly opening the movable door 3. The user only needs to lift the lock body 1, which is far less strenuous than lifting the entire movable door 3.

[0087] Specifically, this embodiment will describe an optimized arrangement of the lock head structure, including the connecting rod 28 and the base 29, on the movable door 3:

[0088] When the safety lock used in the gate includes a connecting rod 28 and a base 29, the side of the movable door 3 facing the fixed frame 4 can be specially designed with an upper protrusion 31 and a lower protrusion 32. The lock body 1 is installed on the upper protrusion 31. The base 29 is installed on the lower protrusion 32. The connecting rod 28 is located between the upper protrusion 31 and the lower protrusion 32, with its upper end connected to the lock body 1 and its lower end movably inserted into the insertion hole 200 of the base 29. This arrangement makes the structure compact, the force transmission path clear, and the appearance neat and uniform.

[0089] The key operating procedure of this utility model is as follows: When it is necessary to open the door, the user first performs an unlocking operation on the locking mechanism, for example, by pressing button 13 to release the lock tongue 14 from the lock groove 100. After holding the unlocking or releasing operation, the user can lift the lock body 1 upwards. The upward movement of the lock body 1 causes the limiting mechanism on it to move upwards as well, thereby releasing the limiting engagement between the limiting mechanism and the fixed frame 4. At this point, the locking and limiting between the movable door 3 and the fixed frame 4 are completely released, and the user can easily push or pull the movable door 3 to open the passage.

[0090] It should be noted that the overall frame and style structure of the door frame involved in this utility model can adopt various forms conventional in the field. For example, the movable door 3 can be a single rotating door or a double door structure with adjustable width. The movable door 3 is usually installed on the wall, door frame, or dedicated mounting post through conventional rotating connecting parts 24 such as hinges, pivots, and pivot seats. The specific structure, materials, and installation and fixing methods of each component of the door frame, such as the movable door 3 body, the fixing frame 4, the width adjustment mechanism, and the rotating connecting parts 24, can all be referenced or directly adopted from mature technologies and conventional design methods in existing safety door frame products. These structural features are not the focus of innovation in this utility model. The core of this utility model lies in the provided safety lock and its working method with the door frame. This lock can be adapted to the above-mentioned various types of door frames, significantly simplifying the unlocking and opening operation while ensuring its safety protection function. Therefore, for specific structural details not described in detail in this specification, those skilled in the art can implement them according to actual needs and with reference to existing technologies, and will not be elaborated further here.

[0091] It should be noted that the term "fixed frame 4" in this utility model should be interpreted broadly. Its core function is to be fixedly installed on one side of the door frame installation position and to provide a lock groove 100 for the locking tongue 14 of the locking mechanism. Therefore, it is not limited to an independent frame with a specific shape. In actual implementation, the "fixed frame 4" can be a specially designed column, mounting plate, or a component with a lock groove 100 that is directly formed or fixedly installed on a wall, door frame, or other fixed building component. That is, any fixed structure or carrier that can stably provide the lock groove 100 falls under the category of "fixed frame 4" in this utility model.

[0092] The most significant advantage of this invention lies in its design allowing the lock body to move independently up and down relative to the door, integrating locking and limiting functions into the lock body. This simplifies the door-opening operation to two consecutive actions: unlocking and lifting. Users only need to lift the lightweight lock body to release all limits, completely avoiding the heavy burden of lifting the entire door in traditional designs. This greatly enhances the convenience of daily passage and significantly improves the user experience. Simultaneously, this design maintains the passive anti-accidental opening function provided by the limiting mechanism in the locked state, ensuring that security is not compromised despite the simplified operation. Furthermore, the lock body has a compact structure, strong adaptability, and can be flexibly applied to various door and gate products, exhibiting excellent versatility and practicality.

[0093] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A security guard lock head adapted to a gate post, characterized in that, include: Lock body (1), used to be installed on the movable door (3) of the gate frame; The lock body (1) is capable of moving in the vertical direction relative to the movable door (3), and has an upper position and a lower position; The lock body (1) is provided with a locking mechanism and a limiting mechanism; The locking mechanism is used to lock or unlock with the fixing frame (4) of the gate; The limiting mechanism is used to limit the lock body (1) when it is in the lower position and to form a limit with the fixing frame (4); When the locking mechanism is in the unlocked state and the lock body (1) is in the upper position, the limiting mechanism is in the released limiting state, thereby allowing the movable door (3) to be opened.

2. The security lock as described in claim 1, characterized in that: The lock body (1) is slidably mounted on the movable door (3); or, The lock body (1) includes a fixed part (11) and a movable part (12). The fixed part (11) is used to install on the movable door (3). The movable part (12) is connected to the fixed part (11) in a way that allows them to move up and down relative to each other. The locking mechanism and the limiting mechanism are disposed on the movable part (12).

3. The security lock as described in claim 1, characterized in that: The locking mechanism is a push-button structure, including a button (13), a locking tongue (14) and a first elastic element (15). The latch (14) is used to extend into the lock groove (100) on the fixing frame (4) of the gate when locked; The button (13) is used to drive the latch (14) out of the lock groove (100) when it is pressed, so as to release the lock between the movable door (3) and the fixed frame (4); The first elastic element (15) is used to provide elastic force to the bolt (14), causing the bolt (14) to maintain a tendency to extend outside the lock body (1).

4. The security lock cylinder as described in claim 3, characterized in that: There are two buttons (13), which are symmetrically arranged on both sides of the lock body (1); The button (13) and the latch (14) are guided and engaged by a bevel; When any of the buttons (13) is pressed, the bolt (14) is retracted into the lock body (1) by the inclined guide to release the lock; When the button (13) is released, the elastic force provided by the first elastic element (15) drives the latch (14) to extend and simultaneously resets the button (13).

5. The security lock as described in claim 1, characterized in that: The limiting mechanism includes a limiting groove (21) and a limiting member (22), as well as a second elastic member (23) that provides the limiting member (22) with an extension tendency; The limiting groove (21) is provided on the lock body (1), the limiting member (22) is provided on the door frame (4), and the bottom wall of the limiting groove (21) is a first guiding slope; or, The limiting member (22) is provided on the lock body (1), the limiting groove (21) is provided on the fixing frame (4), and the top wall of the limiting groove (21) is a second guide slope. When the lock body (1) is in the lower position, the limiting member (22) and the limiting groove (21) are engaged to form a limiting position; When the lock body (1) moves upward, the limiting member (22) is driven to retract under the guidance of the first guide slope or the second guide slope, thereby releasing the limiting between the movable door (3) and the fixed frame (4).

6. The security lock cylinder as described in claim 5, characterized in that: The limiting mechanism further includes: Connector (24) is used to engage with the lock body (1) in a linkage manner; The telescopic component (25) is movably installed within the connector (24); The third elastic element (26) is used to provide the telescopic element (25) with an elastic force that gives it a tendency to extend; A limiting hole (27) with an open top is provided on the fixing frame (4); When the lock body (1) is in the lower position, the telescopic member (25) engages with the limiting hole (27) to form a limit; When the lock body (1) moves upward, the connector (24) moves accordingly, so as to drive the telescopic member (25) to rise synchronously, so that the telescopic member (25) exits from the top opening of the limiting hole (27), thereby releasing the limiting.

7. The security lock as described in claim 6, characterized in that: It also includes a connecting rod (28); The upper end of the connecting rod (28) is fixedly connected to the lock body (1), and the connector (24) is fixed on the connecting rod (28).

8. The security lock cylinder as described in claim 7, characterized in that: It also includes the base (29); The base (29) is used to fix the movable door (3) and is provided with an opening (200) at the top. The lower end of the connecting rod (28) is movably inserted into the socket (200).

9. A door guard characterized by include: The movable door (3) has one side for rotatably connecting to the side of the door frame installation position; The fixing bracket (4) is used to fix the door frame to the other side of the installation position; And a security lock as described in any one of claims 1 to 8; The lock body (1) is installed on the movable door (3); The fixing frame (4) is provided with a locking groove (100) that cooperates with the locking mechanism, and a mating part for forming a limiting cooperation with the limiting mechanism; The safety lock head locks the movable door (3) in the closed position by locking the locking mechanism with the lock groove (100) and by limiting the limiting mechanism with the cooperating part; When the locking mechanism is unlocked, the lock body (1) can move upward relative to the movable door (3). When the lock body (1) is in the upper position, the limiting mechanism is in the released limiting state, thereby allowing the movable door (3) to be opened.

10. The gate as described in claim 9, characterized in that: When the safety lock head includes a connecting rod (28) and a base (29), the movable door (3) has an upper protrusion (31) and a lower protrusion (32) on the side facing the fixed frame (4). The lock body (1) is installed on the upper protrusion (31). The base (29) is mounted on the lower protrusion (32); The connecting rod (28) is located between the upper protrusion (31) and the lower protrusion (32). The upper end of the connecting rod (28) is connected to the lock body (1), and the lower end of the connecting rod (28) is movably inserted into the insertion hole (200) of the base (29).

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