Invisible fire door

Abstract

This application relates to the field of fire doors, and more particularly to a concealed fire door, comprising a door frame and a door body hinged to the door frame. A locking mechanism for locking the door body is provided between the door body and the door frame. The locking mechanism includes a lock cylinder on the door body and a locking assembly on the door frame for locking the lock cylinder. The locking assembly includes two relatively movable clamping arms and a linkage block that is linked to the clamping arms. As the linkage block moves from its initial position to the locked position along a first direction, the two clamping arms gradually close together and enter the locked state. In the locked position, the door body is in the closed state. When the linkage block passes the unlocked position along the first direction, the linkage block can return to its initial position in the unlocked state along a second direction. When opening and unlocking the door, the door body can be unlocked and opened by simply pushing it inward (i.e., along the closing direction), thus eliminating the need for handles or other force-operated components on the door body to assist in opening.

Description

Technical Field

[0001] This application relates to the field of fire doors, and more particularly to a concealed fire door. Background Technology

[0002] Currently, in order to cope with fires, many public places install fire cabinets on the walls to store fire extinguishers, fire hydrants and other fire-fighting equipment. To protect these equipment from fire, fire doors are usually installed on the fire cabinets. In order not to damage the integrity of the wall, some fire doors are installed in a concealed manner, that is, the outer surface of the fire door is decorated with the same decoration as the wall. When the fire door is closed, the fire door and the wall present a unified visual effect.

[0003] However, in related technologies, fire doors are generally equipped with handles for people to hold and open. The addition of handles will destroy the "invisible" effect of the fire door, so it still needs to be improved. Summary of the Invention

[0004] In order to solve at least one of the technical problems mentioned in the background art, the purpose of this application is to provide an invisible fire door.

[0005] To achieve the above objectives, this application provides the following technical solution.

[0006] A concealed fire door includes a door frame and a door body hinged to the door frame, wherein a locking mechanism for locking the door body is provided between the door body and the door frame.

[0007] The locking mechanism includes a lock cylinder on the door body and a locking assembly on the door frame for locking the lock cylinder; the locking assembly includes two relatively movable clamping arms and a linkage block that is linked with the clamping arms.

[0008] When the door is closed, the linkage block, pushed by the lock head, moves sequentially through the initial position, locked position, and unlocked position along the first direction between the two clamping arms: wherein:

[0009] During the process of the linkage block moving from the initial position to the locked position along the first direction, the two clamping arms gradually come together and enter the locked state. In the locked state, the two clamping arms restrict the lock head from disengaging from the two clamping arms along the door opening direction. In the locked position, the linkage block is restricted to move along the second direction opposite to the first direction so that the two clamping arms remain locked and the door is in the closed state.

[0010] After the linkage block passes the unlocked position in the first direction, the linkage block can return to the initial position in the second direction in an unlocked state;

[0011] As the linkage block moves from the locked position to the initial position along the second direction, the two clamping arms gradually open to each other and enter the open state. In the open state, the lock head can freely move in and out between the two clamping arms.

[0012] As an optional embodiment of this application, the locking mechanism further includes a lock box with an open top, in which the linkage block moves along a first direction and a second direction; a first elastic element is provided between the lock box and the linkage block, the first elastic element being used to provide an elastic force to drive the linkage block to have a tendency to move along the second direction.

[0013] As an optional embodiment of this application, the locking mechanism further includes a locking block, an unlocking block, and a second elastic element; the inner wall of the lock box is provided with a protrusion;

[0014] The locking block is mounted on the linkage block and can elastically extend and retract relative to the linkage block in a third direction; the bottom surface of the locking block is inclined to form a first guide surface; in the locked position, the locking block abuts against the bottom wall of the protrusion.

[0015] The unlocking block is located inside the lock box and can move in the second direction to fit against the bottom of the protrusion; the end of the unlocking block is inclined to form a second guide surface opposite to the first guide surface;

[0016] The second elastic element is used to provide an elastic force to drive the unlocking block to move away from the protrusion.

[0017] As an optional embodiment of this application, the linkage block is provided with a slide rail extending in a third direction; the locking block is slidably disposed in the slide rail; the slide rail is provided with a third elastic member, the third elastic member being used to provide elastic force to drive the locking block to have an outward extension tendency.

[0018] As an optional embodiment of this application, the locking mechanism further includes an emergency unlocking component; the emergency unlocking component includes a top block, a top rod, and a limiting block; the top rod is fixed to the bottom of the linkage block; the limiting block is located at the bottom of the lock box and directly opposite the top rod, and in the unlocked position, the top rod abuts against the limiting block; and when the limiting block is subjected to pressure from the top rod exceeding a set value, the limiting block breaks to release the limiting of the top rod;

[0019] The top block is fixed inside the lock box and is used to guide the locking block to retract inward to the locking position in the third direction when the locking block continues to move in the first direction from the unlocked position. In the locking position, a gap is formed between the end of the locking block and the end of the protrusion in the third direction. The linkage block and the locking block are provided with a spring pin on one and a pin hole on the other. When the locking block is in the locking position, the spring pin is inserted into the pin hole to lock the locking block in the third direction.

[0020] As an optional embodiment of this application, the bottom of the lock box is provided with a through hole for the top rod to pass through, and the limiting block is fixed in the through hole by means of a broken line connection.

[0021] As an optional embodiment of this application, the two clamping arms are respectively hinged to both sides of the linkage block; a reset elastic element is provided between the clamping arms and the linkage block, and the reset elastic element is used to provide elastic force to drive the two clamping arms to tend to move away from each other.

[0022] As an optional embodiment of this application, the lock box is provided with two guide members corresponding to the two clamping arms respectively; when the clamping arms move from the initial position to the locked position along the first direction with the linkage block, the guide members overcome the elastic force of the reset elastic member and push against the outer wall of the clamping arms so that the two clamping arms come together.

[0023] As an optional implementation of this application, in the initial position, the linkage block abuts against the guide member and is limited by the guide member.

[0024] As an optional embodiment of this application, the door body is hinged to the door frame via a hinge; the hinge includes:

[0025] Two hinge seats are fixed to the door frame and the door body respectively;

[0026] Two first links are hinged together at the middle, and the first ends of the two first links are respectively hinged to two hinge seats;

[0027] Two second links, the first ends of which are respectively hinged to the second ends of the two first links, and the second ends of the two second links are respectively hinged to two hinge seats.

[0028] Compared with the prior art, this application has the following advantages:

[0029] In this solution, through the special design of the locking mechanism, the door can be automatically locked when closed, and when opening and unlocking, the door can be unlocked and popped open simply by pushing the door inward (i.e., in the closing direction). Thus, there is no need to install handles or other force-operating components on the door to assist in opening the door.

[0030] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of this application, nor is it intended to limit the scope of this application. Other features of this application will become readily apparent from the following description. Attached Figure Description

[0031] The above and other objects, features, and advantages of exemplary embodiments of this application will become readily apparent from the following detailed description taken in conjunction with the accompanying drawings. Several embodiments of this application are illustrated in the drawings by way of example and not limitation, in which:

[0032] In the accompanying drawings, the same or corresponding reference numerals indicate the same or corresponding parts.

[0033] Figure 1 This is a schematic diagram of the structure of this application;

[0034] Figure 2 This is a schematic diagram of the locking mechanism of the linkage block in its initial position according to this application;

[0035] Figure 3 for Figure 2 A magnified view of a portion of the image;

[0036] Figure 4 This is a schematic diagram of the locking mechanism when the linkage block is in the locked position.

[0037] Figure 5 This is a schematic diagram of the locking mechanism when the linkage block is in the unlocked position.

[0038] Figure 6 This is a schematic diagram of the locking mechanism during the unlocking process of the linkage block in this application;

[0039] Figure 7 This is a schematic diagram of the locking mechanism for emergency unlocking in this application;

[0040] Figure 8 This is a schematic diagram of the bottom structure of the lock box in this application.

[0041] Explanation of the labels in the diagram:

[0042] 1. Door frame; 11. Crossbar; 111. Concave step; 112. Concave step; 12. First fireproof seal; 13. First fireproof expansion seal; 14. Second fireproof expansion seal;

[0043] 2. Door body; 21. Steel plate; 22. Magnesium oxide fireproof door core board; 23. Decorative layer; 24. Seam edge;

[0044] M. Locking mechanism:

[0045] 3. Lock head; 31. Connecting rod;

[0046] 4. Locking assembly; 40. Lock box; 401. Through hole; 402. Limiting block; 403. Break line; 404. Top block; 41. Clamping arm; 42. Linkage block; 421. Top shaft; 422. Top rod; 423. Slide rail; 43. Guide component; 44. First spring; 45. Locking block; 451. First guide surface; 452. Pin hole; 453. Third spring; 46. Elastic pin; 461. Pin body; 462. Fourth spring; 47. Protrusion; 48. Unlocking block; 481. Second guide surface; 482. Second spring; 483. Connecting block;

[0047] 5. Hinge; 50. Hinge base; 51. First link; 52. Second link. Detailed Implementation

[0048] To make the objectives, features, and advantages of this application more apparent and understandable, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0049] Reference Figure 1-8 As shown, this embodiment provides a concealed fire door, including a door frame 1 and a door body 2 hinged to the door frame 1. A locking mechanism M for locking the door body 2 is provided between the door body 2 and the door frame 1.

[0050] In some embodiments, the door frame 1 is mainly a rectangular frame structure formed by four horizontal bars 11 connected end to end in sequence, and the door frame 1 is fixedly fitted into the door opening in the wall.

[0051] The door body 2 and the door frame 1 are adapted to form a rectangular structure. In some embodiments, such as... Figure 1 As shown, in order to improve the fire resistance of the door body 2, the door body 2 mainly includes two oppositely arranged steel plates 21, with a magnesium oxide fireproof door core board 22 filling between the two steel plates 21; wherein the edges of the two steel plates 21 are bent and welded together.

[0052] In addition, to improve the concealment effect, a decorative layer 23 is fixed on the outer steel plate of the door 2. The decorative layer 23 is the same as or similar to the appearance of the surrounding wall. In this way, when the door 2 is closed, the outside of the door 2 looks like a whole with the wall.

[0053] One end of the door body 2 is hinged to the door frame 1 via a hinge 5, and the other end serves as the movable end of the door body 2.

[0054] In some embodiments, such as Figure 1 As shown, the hinge 5 mainly includes two hinge seats 50, two first connecting rods 51 and two second connecting rods 52; wherein, the two hinge seats 50 are fixed on the door frame 1 and the door body 2 respectively.

[0055] The two first links 51 are hinged together at the middle to form a cross link structure.

[0056] Two first connecting rods 51, one of which has its first end hinged to one of the hinge seats 50, and the other has its first end hinged to the other hinge seat 50.

[0057] Two second links 52, one of which has its first end hinged to the second end of one of the first links 51, and the other has its first end hinged to the second end of the other first link 51.

[0058] Two second connecting rods 52, one of which has its second end hinged to one of the hinge seats 50, and the other has its second end hinged to the other hinge seat 50.

[0059] The hinge 5 described above is used to achieve the hinge connection of the door 2. Its advantage is that the door 2 can open 120° relative to the wall when it is opened.

[0060] In some embodiments, to improve sealing performance, a protruding locking edge 24 is formed at the movable end of the door body 2; correspondingly, two concave steps are formed on the crossbar 11 on the side of the door frame 1 near the movable end of the door body 2, namely an outer concave step 112 and an inner concave step 111. The outer concave step 112 is for the locking edge to be inserted, and the inner concave step 111 is for the inner corner of the door body 2 to be inserted. A first fireproof seal 12 is fixed on the inner concave step, and a first fireproof expansion seal 13 is provided on the side of the locking edge 24 facing the outer concave step 112.

[0061] In addition, a second fireproof expansion seal 14 is fixed to one end of the decorative layer 23 near the hinge 5, and the second fireproof expansion seal 14 is located between the decorative layer and the wall.

[0062] Combination Figure 1 As shown, the locking mechanism M is mainly used to lock the door 2 when the door 2 is closed; the locking mechanism M includes a lock head 3 on the door 2 and a locking component 4 on the door frame 1 for locking the lock head 3.

[0063] In some embodiments, such as Figure 2 As shown, the lock head 3 is spherical and is fixedly connected to the door body 2 by the connecting rod 31, so that the lock head 3 can move synchronously with the door body 2.

[0064] The locking assembly 4 includes a lock box 40, two relatively movable clamping arms 41, and a linkage block 42 that is linked with the clamping arms 41; the lock box 40 is fixed on a crossbar 11 on one side of the movable end of the door body 2, and the clamping arms 41 and the linkage block 42 are both installed on the lock box 40, with the top of the lock box 40 open.

[0065] The linkage block 42 is configured as follows:

[0066] When the door is closed, that is, when the door 2 is gradually closed, the linkage block 42 can pass through the initial position, the locked position and the unlocked position in sequence along the first direction between the two clamping arms 41 under the push of the lock head 3.

[0067] In the initial position, such as Figure 2 As shown, the lock head 3 just contacts the linkage block 42. From the initial position, as the door body 2 continues to rotate in the closing direction, the lock head 3 pushes the linkage block 42 through the locked position and the unlocked position in sequence. It is worth noting that in the locked position, the door body 2 is in the closed state, that is, the door body 2 is basically parallel to the wall.

[0068] In some embodiments, for ease of description, the direction opposite to the first direction is referred to as the second direction. Specifically, in this embodiment, both the first direction and the second direction can be understood as directions perpendicular to the wall. The difference is that the first direction can be understood as the direction towards the inside of the wall, while the second direction can be understood as the direction towards the outside of the wall.

[0069] As the linkage block 42 moves from its initial position to the locked position along the first direction, the two clamping arms 41 gradually come together and enter the locked state. In the locked state, as... Figure 4 As shown, the two clamping arms 41 restrict the lock head 3 from disengaging from the two clamping arms 41 in the opening direction;

[0070] And in the locked position, such as Figure 4 As shown, the linkage block 42 is restricted to move in the second direction so that the two clamping arms 41 remain locked. That is, in the locked position, the linkage block 42 can continue to move forward in the first direction, but cannot retract in the second direction, so that the clamping arms 41 remain locked.

[0071] When the linkage block 42 passes the unlock position along the first direction, as Figure 5 As shown, the linkage block 42 can return to its initial position in the second direction in an unlocked state; that is, when the linkage block 42 passes the unlocked position, the restriction of the linkage block 42 in the second direction is released, so that the linkage block 42 can freely return to its initial position in the second direction.

[0072] Furthermore, as the linkage block 42 moves from the locked position to the initial position along the second direction, the two clamping arms 41 gradually open to each other and enter the open state. In the open state, as... Figure 2 As shown, the lock head 3 can freely move in and out between the two clamping arms 41.

[0073] With the above settings, the fire door provided in this embodiment has the following specific opening and closing actions: When closing, as the door body 2 gradually closes, it will go through the following stages in sequence. First, the door body 2 rotates until the lock head 3 just abuts against the linkage block 42 (at this time, the linkage block 42 is in its initial position, such as...). Figure 2 As shown), then, as the door 2 continues to close, the lock 3 pushes the linkage block 42 to continue moving forward in the first direction until the linkage block 42 reaches the locked position (as shown). Figure 4 As shown), during this process, the two clamping arms 41 gradually close together and finally hold the lock head 3, entering the locked state. At this time, under the restriction of the two clamping arms 41, the lock head 3 cannot be pulled out from between the two clamping arms 41, thereby locking the door body 2. At this time, the door body 2 is in the closed state, completing the closing action.

[0074] When it is necessary to open the door, continue pushing the door body 2 inward in the closing direction. At this time, the lock cylinder 3 will continue to push the linkage block 42 in the first direction, so that the linkage block 42 is gradually pushed to the unlocked position (e.g., Figure 5 As shown, after the linkage block 42 passes the unlock position, the linkage block 42 can freely reset to the initial position along the second direction. During the reset process, the two clamping arms 41 gradually open, thereby gradually releasing the grip on the lock head 3. The linkage block 42 will push the lock head 3 along the second direction, and the door body 2 will spring open in the opening direction, thereby realizing the opening action.

[0075] Therefore, in this solution, through the special design of the locking mechanism M, the door body 2 can be automatically locked when the door is closed, and when opening and unlocking, the door body 2 can be unlocked and popped open simply by pushing it inward (i.e. along the closing direction). Thus, there is no need to install handles or other force-bearing components on the door body 2 to assist in opening the door.

[0076] In short, the locking and unlocking method of this door 2 is as follows: press the door 2 inward once to lock the door 2, and press the door 2 again to open the door 2 automatically.

[0077] In this embodiment, the specific structure of the two clamping arms 41 and the linkage block 42 is as follows:

[0078] like Figure 2 As shown, the two clamping arms 41 are respectively hinged to both sides of the linkage block 42. Specifically, the top of the linkage block 42 extends upward to form a top shaft 421, and the lower ends of the two clamping arms 41 are hinged to both sides of the top shaft 421. In order to accommodate the spherical lock head 3, in this embodiment, the lower part of the clamping arm 41 is straight to form a straight arm, and the upper part of the clamping arm 41 is bent inward to form an arc-shaped bend for holding the lock head 3. In the locked state, the bend of the two clamping arms 41 abuts against the upper part of the lock head 3 to prevent the lock head 3 from disengaging and to achieve locking.

[0079] A reset elastic element is provided between the clamping arm 41 and the linkage block 42. The reset elastic element is used to provide elastic force to drive the two clamping arms 41 to have a tendency to move away from each other. In some embodiments, the reset elastic element can be a torsion spring (not shown in the figure). The torsion spring is located at the hinge point of the clamping arm 41. The torsion force of the torsion spring drives the clamping arm 41 to have a tendency to flip outward, that is, to drive the two clamping arms 41 to have a tendency to move away from each other.

[0080] In the initial position, such as Figure 2 As shown, the two clamping arms 41 fold outward under the torsion of the torsion spring, and finally abut against the upper port of the lock box 40, so that the clamping arms 41 remain open for the lock head 3 to be inserted.

[0081] by Figure 2 Taking the shown perspective as an example, the first direction can be understood as the downward direction, and the second direction can be understood as the upward direction.

[0082] Furthermore, the lock box 40 is provided with two guide members 43 corresponding to the two clamping arms 41 respectively. As the clamping arms 41 move from their initial position to the locked position along the first direction with the linkage block 42, the clamping arms 41 move downwards. When the outer walls of the two clamping arms 41 reach the guide members 43, as the clamping arms 41 continue to move downwards, the guide members 43 abut against the clamping arms 41, causing the clamping arms 41 to gradually flip inwards against the elastic force of the reset elastic member, thereby achieving the mutual closing of the two clamping arms 41. In the locked state, the straight arm portions of the two clamping arms 41 are parallel to each other and extend approximately along the first direction.

[0083] In other words, in this embodiment, the guide 43 drives the clamping arm 41 to flip inward and enter the locking state during the downward movement of the clamping arm 41.

[0084] To reduce the friction between the guide member 43 and the clamping arm 41, the guide member 43 is preferably a roller.

[0085] The linkage block 42 can move in the lock box 40 along the first direction and the second direction; a first elastic element is provided between the lock box 40 and the linkage block 42. The first elastic element is used to provide elastic force to drive the linkage block 42 to have a tendency to move along the second direction, that is, the linkage block 42 is mainly driven to reset by the first elastic element.

[0086] In some embodiments, the first elastic element may be a first spring 44, which extends in a first direction, with one end fixed to the bottom of the linkage block 42 and the other end fixed to the bottom of the lock box 40. The linkage block 42 is pushed upward by the first spring 44 (i.e., moved in a second direction).

[0087] In the initial position, such as Figure 2 As shown, under the push of the first spring 44, the linkage block 42 abuts against the bottom of the guide 43 to remain in the initial position.

[0088] When the door is closed, the linkage block 42 will overcome the thrust of the first spring 44 and move downward from the initial position to the locked position under the push of the lock head 3. During this process, the two clamping arms 41 gradually close together to hold the lock head 3. When the linkage block 42 reaches the locked position, it will be locked and cannot move upward (i.e., in the second direction). In this way, the two clamping arms 41 will remain locked and lock the lock head 3, thus achieving the locking of the door 2 after it is closed.

[0089] After the linkage block 42 reaches the locked position, as Figure 4 As shown, it can still move downwards to pass the unlock position and unlock. Once the linkage block 42 has passed the unlock position, as... Figure 5As shown, the locking of the linkage block 42 in the second direction (i.e., upward) is released. Under the force of the first spring 44, the linkage block 42 will be pushed upward, and then the linkage block 42 will push the clamping arm 41 and the lock head 3 to move upward. During the upward movement of the clamping arm 41, after the clamping arm 41 passes the guide 43, the clamping arm 41 will gradually flip outward under the torque of the torsion spring, and finally be in an open state at the initial position. Under the push of the linkage block 42, the lock head 3 and the door body 2 will be pushed to open in the opening direction to realize the opening of the door.

[0090] In order to achieve the locking and unlocking actions of the linkage block 42, in this embodiment, combined with Figure 2 and Figure 3 As shown, the locking mechanism M further includes a locking block 45, an unlocking block 48, and a second elastic element; a protrusion 47 is fixed on the inner wall of the lock box 40; in this embodiment, the protrusion 47 is roughly triangular, with the top surface being the hypotenuse of the triangle.

[0091] The locking block 45 is disposed on the linkage block 42 and can elastically extend and retract relative to the linkage block 42 along a third direction. In this embodiment, the third direction is a direction perpendicular to the first direction. Figure 2 Taking the perspective shown as an example, it can be understood as horizontal.

[0092] Specifically, such as Figure 3 As shown, the linkage block 42 is provided with a slide 423 extending in a third direction; the locking block 45 is slidably disposed in the slide 423 and cannot rotate within the slide 423; a third elastic element is provided in the slide 423, the third elastic element is used to provide elastic force to drive the locking block 45 to have an outward extension tendency, so as to realize the elastic extension and retraction of the locking block 45.

[0093] In some embodiments, two sets of locking blocks 45 and protrusions 47 are provided, symmetrically arranged on both sides of the linkage block 42; the slide 423 passes through the linkage block 42 in a third direction, and the two locking blocks 45 are installed in the same slide 423. The third elastic element can be a third spring 453, which is provided in the slide 423, and its two ends are fixed or abutted against the two locking blocks 45 respectively. The locking blocks 45 are pushed outward by the elastic force of the third spring 453, or in other words, moved away from each other.

[0094] like Figure 3As shown, the bottom surface of the front end of the locking block 45 is inclined to form a first guide surface 451. During the movement of the linkage block 42 from its initial position downwards towards the locked position, the first guide surface 451 of the locking block 45 contacts the protrusion 47. As the locking block 45 continues to move downwards, under the pushing force of the protrusion 47, the locking block 45 overcomes the elastic force of the third spring 453 and gradually retracts inwards, eventually passing the protrusion 47. After passing the protrusion 47, the locking block 45 extends again under the elastic force of the third spring 453. Thus, the protrusion 47 forms a limit on the upper side of the locking block 45. Under the elastic force of the first spring 44, the linkage block 42 is pushed upwards, causing the upper wall of the locking block 45 to abut against the lower wall of the protrusion 47. At this time, the locking block 45 remains in the locked position (e.g., Figure 4 As shown in the image, it cannot move upwards any further.

[0095] The unlocking block 48 is disposed inside the lock box 40 and below the protrusion 47. The unlocking block 48 is vertically slidably connected inside the lock box 40, meaning that the unlocking block 48 can move up and down inside the lock box 40. When the unlocking block 48 moves to its highest point, its top wall is in contact with the bottom wall of the protrusion 47 (e.g., Figure 6 (as shown); the bottom wall of the unlocking block 48 is inclined to form a second guide surface 481 opposite to the first guide surface 451; in some embodiments, the first guide surface 451 is perpendicular to the second guide surface 481, for example, the inclination angle of the first guide surface 451 is positive 45°, and the inclination angle of the second guide surface 481 is negative 45°.

[0096] The second elastic element is used to provide elastic force to drive the unlocking block 48 to move away from the protrusion 47, that is, the second elastic element is used to drive the unlocking block 48 to move downward; specifically, the second elastic element can be a second spring 482; an L-shaped connecting block 483 is provided in the lock box 40, the second spring 482 extends vertically, one end of which is fixed to the connecting block 483, and the other end is fixed to the unlocking block 48; under the tension of the second spring 482, the unlocking block 48 abuts against the upper end of the connecting block 483.

[0097] As the locking block 45 continues to move downward from the locked position along with the linkage block 42, when the first guide surface 451 of the locking block 45 contacts the tip of the unlocking block 48 and continues to move downward, the locking block 45 will retract inward under the push of the unlocking block 48 to pass the tip of the unlocking block 48; after passing the tip, the third spring 453 pushes the locking block 45 outward to abut against the second guide surface 481; at this time, if the pressure of the hand on the door body 2 is released, the linkage block 42 and the locking block 45 will move upward under the push of the first spring 44; during this process, the locking block 45 will abut against the second guide surface 481 and pull the unlocking block 48 upward until the unlocking block 48 abuts against the protrusion 47 (as shown in the image). Figure 6As shown), at this point, the unlocking block 48 can no longer move upwards. Therefore, when the locking block 45 continues to move upwards, the second guide surface 481 will push the locking block 45 to gradually retract inwards, eventually passing over the protrusion 47 to achieve unlocking. This allows the locking block 45 to move along the second direction after passing the unlock position.

[0098] In practical applications, since the unlocking of the clamping arm 41 is actually achieved by the unlocking block 48 moving upward to guide the locking block 45 over the protrusion 47, if the unlocking block 48 malfunctions, for example, if the unlocking block 48 becomes stuck and cannot slide upward normally, the clamping arm 41 will not be unlocked, thus preventing the door 2 from being opened. In this case, if the door 2 needs to be opened, it is usually necessary to damage the structure of the door 2.

[0099] Therefore, in order to open the door 2 without damaging it, in some embodiments, the locking mechanism M further includes an emergency unlocking component, which includes a top block 404, a top rod 422, and a limit block 402.

[0100] The top rod 422 is fixed to the bottom of the linkage block 42 and extends vertically.

[0101] The limiting block 402 is located at the bottom of the lock box 40 and directly opposite the top rod 422, and is used to limit the downward movement of the top rod 422.

[0102] When the linkage block 42 is in the unlocked position, the top rod 422 and the limit block 402 are in abutting state. In other words, when unlocking, push the door body 2 in the closing direction to move the linkage block 42 downward. When the linkage block 42 is pushed downward until the top rod 422 abuts the limit block 402, the linkage block 42 reaches the unlocked position. At this time, release the hand, and the door body 2 will be popped open.

[0103] The top block 404 is fixed inside the lock box 40 and is used to guide the locking block 45 to retract inward to the locking position in a third direction when the locking block 45 continues to move in the first direction from the unlocked position. Specifically, the top block 404 is in the shape of a straight plate and extends vertically against the side of the linkage block 42. The linkage block 42 can slide vertically relative to the top block 404.

[0104] The upper end of the top block 404 serves as the end that pushes against the locking block 45, wherein the upper end of the top block 404 is lower than the unlocking block 48; and when the top rod 422 abuts against the limiting block 402, the upper end of the top block 404 does not contact the locking block 45. For example, at this time, the upper end of the top block 404 is just flush with the bottom surface of the slide 423; thus ensuring that when the linkage block 42 moves downward and unlocks through the unlocking block 48, the locking block 45 will not be pushed inward by the top block 404.

[0105] The limiting block 402 and the lock box 40 are not forcibly fixed, but rather configured such that when the pressure from the push rod 422 on the limiting block 402 exceeds a set value, the limiting block 402 disconnects to release the limiting effect on the push rod 422. For example, combined with Figure 8 As shown, the bottom of the lock box 40 is provided with a through hole 401 through which the top rod 422 can pass. The limiting block 402 is fixed in the through hole 401 by means of a break line 403 (or break point). In this way, when the limiting block 402 is subjected to a strong impact, the break line 403 will break, causing the limiting block 402 to disengage from the lock box 40.

[0106] When the unlocking block 48 malfunctions and cannot unlock normally, the door body 2 can be pushed forcefully in the closing direction. The door body 2 will then push the linkage block 42 downward through the lock head 3. In turn, the push rod 422 will push the limit block 402 downward. When the force is strong enough, the push rod 422 will push the limit block 402 open. Without the restriction of the limit block 402, the linkage block 42 and the push rod 422 can continue to move downward. During the continued downward movement, the upper end of the push block 404 will squeeze the first guide surface 451, causing the locking block 45 to retract inward to reach the locking position.

[0107] In the locked position, the end of the locking block 45 (i.e. the end of the locking block 45 near the unlocking block 48) is spaced apart from the end of the protrusion 47 and the end of the locking block 45 in the third direction; preferably, in the locked position, the end of the locking block 45 is retracted to be flush with the side of the linkage block 42.

[0108] The significance of this arrangement is that when the locking block 45 moves upward together with the linkage block 42 while maintaining the locked position, the protrusion 47 and the unlocking block 48 will not obstruct the locking block 45, thus achieving unlocking.

[0109] To keep the locking block 45 in the locked position, one of the linkage block 42 and the locking block 45 is provided with a resilient pin 46, and the other is provided with a pin hole 452. When the locking block 45 is in the locked position, as... Figure 7 As shown, the resilient pin 46 is inserted into the pin hole 452 to lock the locking block 45 in the third direction; for example, in this embodiment, as Figure 3 As shown, the elastic pin 46 is located on the linkage block 42, and the locking hole is located on the locking block 45. Specifically:

[0110] The elastic pin 46 includes a pin body 461 and a fourth spring 462. A mounting hole extending vertically and communicating with the slide rail 423 is provided inside the locking block 45. The pin body 461 is slidably connected in the mounting hole along the vertical direction. The fourth spring 462 is located in the mounting hole, and its two ends are fixed to the top wall of the mounting hole and the upper end of the pin body 461, respectively. Under the elastic force of the fourth spring 462, the outer end of the pin body 461 is pushed to abut against the top wall of the locking block 45.

[0111] When the locking block 45 is pushed to the locking position by the top block 404, the pin hole 452 is aligned with the pin body 461. Under the force of the fourth spring 462, the pin body 461 will be inserted into the pin hole 452, thus locking the locking block 45 and preventing the locking block 45 from extending or retracting in the third direction (i.e., the left and right direction). This allows the locking block 45 to remain in the locked position and move upward with the linkage block 42 for emergency unlocking.

[0112] It should be understood that the various forms of processes shown above can be used to rearrange, add, or delete steps. For example, the steps described in this application can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution disclosed in this application can be achieved, and this is not limited herein.

[0113] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0114] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A concealed fire door, comprising a door frame and a door body hinged to the door frame, wherein a locking mechanism for locking the door body is provided between the door body and the door frame, characterized in that, The locking mechanism includes a lock cylinder on the door body and a locking assembly on the door frame for locking the lock cylinder; the locking assembly includes two relatively movable clamping arms and a linkage block that is linked with the clamping arms. When the door is closed, the linkage block, pushed by the lock head, moves sequentially through the initial position, locked position, and unlocked position along the first direction between the two clamping arms; wherein: During the process of the linkage block moving from the initial position to the locked position along the first direction, the two clamping arms gradually come together and enter the locked state. In the locked state, the two clamping arms prevent the lock head from disengaging from the two clamping arms along the door opening direction. In the locked position, the linkage block is restricted to move along the second direction opposite to the first direction so that the two clamping arms remain locked and the door is in the closed state. After the linkage block passes the unlocked position in the first direction, the linkage block can return to the initial position in the second direction in an unlocked state; As the linkage block moves from the locked position to the initial position along the second direction, the two clamping arms gradually open to each other and enter the open state. In the open state, the lock head can freely move in and out between the two clamping arms.

2. The concealed fire door according to claim 1, characterized in that, The locking mechanism further includes a lock box with an open top, in which the linkage block moves along a first direction and a second direction; a first elastic element is provided between the lock box and the linkage block, the first elastic element being used to provide an elastic force to drive the linkage block to have a tendency to move along the second direction.

3. The concealed fire door according to claim 2, characterized in that, The locking mechanism further includes a locking block, an unlocking block, and a second elastic element; the inner wall of the lock box is provided with a protrusion; The locking block is mounted on the linkage block and can elastically extend and retract relative to the linkage block in a third direction; the bottom surface of the locking block is inclined to form a first guide surface; in the locked position, the locking block abuts against the bottom wall of the protrusion. The unlocking block is located inside the lock box and can move in the second direction to fit against the bottom of the protrusion; the end of the unlocking block is inclined to form a second guide surface opposite to the first guide surface; The second elastic element is used to provide an elastic force to drive the unlocking block to move away from the protrusion.

4. The concealed fire door according to claim 3, characterized in that, The linkage block is provided with a slide rail extending in a third direction; the locking block is slidably disposed in the slide rail; the slide rail is provided with a third elastic element, which is used to provide elastic force to drive the locking block to have an outward extension tendency.

5. The concealed fire door according to claim 3, characterized in that, The locking mechanism further includes an emergency unlocking component; the emergency unlocking component includes a top block, a top rod, and a limiting block; the top rod is fixed to the bottom of the linkage block; the limiting block is located at the bottom of the lock box and directly opposite the top rod. In the unlocked position, the top rod abuts against the limiting block; and when the limiting block is subjected to pressure from the top rod exceeding a set value, the limiting block breaks to release the limiting of the top rod. The top block is fixed inside the lock box and is used to guide the locking block to retract inward to the locking position in the third direction when the locking block continues to move in the first direction from the unlocked position. In the locking position, a gap is formed between the end of the locking block and the end of the protrusion in the third direction. The linkage block and the locking block are provided with a spring pin on one and a pin hole on the other. When the locking block is in the locking position, the spring pin is inserted into the pin hole to lock the locking block in the third direction.

6. The concealed fire door according to claim 5, characterized in that, The bottom of the lock box is provided with a through hole for the top rod to pass through, and the limiting block is fixed in the through hole by means of a broken line connection.

7. The concealed fire door according to claim 2, characterized in that, The two clamping arms are respectively hinged to both sides of the linkage block; a reset elastic element is provided between the clamping arms and the linkage block, which is used to provide elastic force to drive the two clamping arms to move away from each other.

8. The concealed fire door according to claim 7, characterized in that, The lock box is provided with two guide members corresponding to the two clamping arms respectively; when the clamping arms move from the initial position to the locked position along the first direction with the linkage block, the guide members overcome the elastic force of the reset elastic member and push against the outer wall of the clamping arms so that the two clamping arms come together.

9. The concealed fire door according to claim 8, characterized in that, In the initial position, the linkage block abuts against the guide member and is limited by the guide member.

10. The concealed fire door according to claim 1, characterized in that, The door body is hinged to the door frame via hinges; the hinges include: Two hinge seats are fixed to the door frame and the door body respectively; Two first links are hinged together at the middle, and the first ends of the two first links are respectively hinged to two hinge seats; Two second links, the first ends of which are respectively hinged to the second ends of the two first links, and the second ends of the two second links are respectively hinged to two hinge seats.

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