Hidden self-locking door lock

Abstract

The utility model discloses a hidden type self-locking door lock which comprises an installation frame, a lock hook, a lock catch, an elastic piece and a limiting piece, the lock hook is rotationally arranged on the installation frame, the elastic piece is located between the installation frame and the lock hook and used for driving the lock hook to reset, the lock catch is matched with the lock hook and used for unlocking or locking, the limiting piece is installed on the lock hook, and the lock hook rotates to lock the lock hook. The limiting piece abuts against the lock catch and is used for limiting resetting of the lock hook; the limiting piece is separated from the lock catch along with relative movement of the lock catch and the lock hook, and the lock hook resets under the action of the elastic piece. According to the working principle that the lock hook is matched with the lock catch, the limiting piece can achieve limiting of the lock hook, and even if external force disappears after unlocking, the problem that when the panel is not opened, the lock hook is connected with the lock catch, and consequently unlocking fails can be solved. And meanwhile, the limiting piece does not affect self-locking of the panel and the case when the panel is closed, so that the door lock is more suitable for being used in the hemodialysis equipment box.

Description

Technical Field

[0001] This utility model relates to the field of cabinet door lock technology, and in particular to a concealed self-locking door lock. Background Technology

[0002] Currently, the panel and chassis of hemodialysis equipment are connected by screws. This method has limitations in clinical use, as the locking process can be overlooked, leading to the safety hazard of the panel accidentally opening during operation. Furthermore, during transportation, external forces such as vibration can cause the screws to loosen, affecting the safety of transporting the equipment. Therefore, it is urgent to adopt alternative locking mechanisms for the panel and chassis of hemodialysis equipment, enabling them to automatically lock together when a preset closing angle is reached. This would effectively eliminate the risk of accidental panel opening due to human error, ensuring the safety of the treatment process and the stability of equipment operation.

[0003] Self-locking door locks on the market mainly consist of a latch, a hook, and a spring mechanism. The latch and hook are installed on the housing and the panel, respectively. The hook rotates and separates from the latch to unlock the panel and housing. The hook returns to its original position under the action of the spring mechanism, and the panel moves toward the hook to lock the latch and hook together, thus completing the self-locking function.

[0004] Because the control panel of a hemodialysis machine contains many other precision components, extra care must be taken when opening it. Since most panels open downwards, the operator must hold the panel with both hands and slowly move it open after the locking hook separates from the control hook. Current self-locking door locks require additional external force to counteract the rebound force of the locking hook and the operator must not release the handle; otherwise, the locking hook will automatically return to its original position and lock the panel latch under the action of the elastic element. This makes the existing simple self-locking door lock unsuitable for use with the hemodialysis machine's chassis. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides a concealed self-locking door lock. After the lock hook and latch are separated, the limiting component can prevent the lock hook and latch from locking together, and the external force on the lock hook can be removed, so that the operator can operate the panel with both hands. This makes the self-locking door lock of this application suitable for use in the chassis of hemodialysis equipment.

[0006] To achieve the above objectives, this utility model adopts the following technical solution: a concealed self-locking door lock, comprising a mounting bracket, a lock hook, a lock buckle, an elastic element, and a limiting element.

[0007] The locking hook is set to rotate on the mounting bracket.

[0008] The elastic element is located between the mounting bracket and the locking hook, and is used to drive the locking hook to reset.

[0009] The latch and hook work together to unlock or lock.

[0010] The limiting component is installed on the lock hook. When the lock hook rotates, it causes the position of the limiting component to change and abut against the lock buckle, thereby preventing the lock hook from resetting. As the lock buckle and the lock hook move relative to each other, the limiting component separates from the lock buckle, and the lock hook resets under the action of the elastic component.

[0011] Compared with the prior art, the present invention has the following beneficial effects:

[0012] The mounting bracket and latches of this application can be set on the front panel and the chassis respectively, or on the chassis and the front panel respectively. As long as the cooperation of the latches and latches on the mounting bracket can enable the unlocking and locking of the front panel and the chassis, it is acceptable.

[0013] The structure of the hook, latch, and elastic element can all adopt existing technologies. The latch is roughly "door" shaped, and the horizontal section of the latch is cylindrical. The hook is hook-shaped, and a wedge-shaped guide surface that cooperates with the latch is provided on the outside of the hook. The elastic element can be a spring, torsion spring, elastic sheet, etc., to ensure that after the hook rotates under the action of external force, the external force disappears, and the hook can be reset under the action of the elastic element, which facilitates the self-locking of the latch and the hook.

[0014] This application adds a limiting component to the existing self-locking door lock. During use, the lock hook rotates under external force, unlocking the latch. After rotation, the lock hook drives the limiting component to move. The limiting component has sufficient space to change position, and after changing position, it abuts against the latch, preventing the lock hook from returning to its original position. At this point, the external force acting on the lock hook disappears. Even if the panel does not move, the lock hook will not reset and lock against the latch under the action of the elastic component, avoiding the inconvenience caused by the need for continuous external force to counteract the rebound force of the elastic component in existing technologies. Simultaneously, with the limiting component installed on the lock hook, there will be relative movement between the lock hook and latch after unlocking, which is the panel opening operation. Correspondingly, the limiting component separates from the latch, and the abutting force between them disappears. At this time, the lock hook resets under the action of the spring component. Therefore, when the panel is closed with the housing after operation, the latch and lock hook are equivalent to the self-locking door lock in existing technologies, achieving self-locking operation.

[0015] The limiting component of this application, based on the working principle of the locking hook and latch, can limit the locking hook, preventing the locking hook from reconnecting with the latch when the panel is not open, thus avoiding unlocking failure, even after the external force disappears after unlocking. At the same time, the existence of the limiting component does not affect the self-locking between the panel and the chassis when closed, making the door lock of this application more suitable for use in hemodialysis equipment housings.

[0016] Furthermore, the limiting component includes a limiting block, which is rotatably connected to the lock hook, and the limiting block has a locked state and an unlocked state when it rotates along the lock hook.

[0017] When the limit block is in the locked state, the limit block abuts against the latch; when the limit block is in the unlocked state, the limit block contacts the latch.

[0018] Furthermore, one end of the lock hook is provided with a hook-shaped structure, and a rotating pin is provided on the lock hook at or adjacent to the hook-shaped structure. The limiting block is rotatably connected to the lock hook through the rotating pin, and the limiting block is rotatably set along the central axis of the rotating pin.

[0019] When the limit block is rotated to the locked state, the limit block contacts the latch, and the end of the hook-shaped structure is spaced apart from the latch.

[0020] Furthermore, a gravity component is connected to the limiting block to drive the limiting block to move toward the latch.

[0021] Furthermore, a limiting structure is provided between the limiting block and the locking hook to limit the rotation angle of the limiting block. The limiting structure includes a rotating protrusion on the limiting block and a limiting groove on the locking hook. The rotating protrusion rotates with the limiting block and contacts the limiting groove, and the limiting block is in a locked state.

[0022] Furthermore, the middle part of the locking hook is hinged to the mounting bracket, one end of the locking hook is engaged with the locking buckle, and the other end of the locking hook is provided with a rotating part for driving the locking hook to rotate along its hinge point with the mounting bracket.

[0023] Furthermore, the rotating component includes a first link and a second link that are hinged to each other. The first link is rotatably connected to the mounting bracket, and the second link is hinged to the locking hook. When the first link rotates, it causes the locking hook to rotate along its hinge point with the mounting bracket.

[0024] Furthermore, the first link is fixed with a drive pin, which is rotatably connected to the mounting bracket. When the drive pin rotates, it drives the first link to rotate.

[0025] Furthermore, the drive pin is provided with a non-circular insertion hole, which is used to connect with the drive component. External force is applied to the drive component to drive the drive pin to rotate.

[0026] Furthermore, the mounting bracket is equipped with a positioning structure that limits the rotation angle of the first link. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of an assembly structure of the door lock, housing, and panel of this utility model;

[0028] Figure 2 This is a schematic diagram of the structure of this utility model;

[0029] Figure 3This is a schematic diagram of a partial explosion structure of the present invention;

[0030] Figure 4 for Figure 3 A structural diagram from another perspective;

[0031] Figure 5 This is a schematic diagram of the structure when the locking hook and the connecting part are locked together in this utility model;

[0032] Figure 6 This is a schematic diagram of one structure of the locking hook and connecting part after unlocking in this utility model;

[0033] Figure 7 This is a schematic diagram of the cooperation structure between the locking hook and the connecting part after unlocking, and the limiting member and the connecting part in this utility model;

[0034] Figure 8 This is a schematic diagram of a mating structure of the locking hook and connecting part of this utility model when they are self-locking.

[0035] In the figure: mounting bracket 100, locking hook 110, hook-shaped structure 111, guiding surface 112, limiting slot 113, limiting block 120, rotating pin 121, rotating protrusion 122, gravity part 123, elastic element 130, rotating element 140, second connecting rod 141, first connecting rod 142, driving pin 143, insertion hole 1431, positioning structure 150, first limiting protrusion 151, second limiting protrusion 152, latch 200, connecting part 210, mounting part 220, panel 300, chassis 400. Detailed Implementation

[0036] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0037] like Figure 1-8 As shown, a concealed self-locking door lock includes a mounting bracket 100, a lock hook 110, a latch 200, an elastic element 130, and a limiting element. The lock hook 110 is rotatably mounted on the mounting bracket 100. The elastic element 130 is located between the mounting bracket 100 and the lock hook 110 and is used to drive the lock hook 110 to reset. The latch 200 cooperates with the lock hook 110 for unlocking or locking. The limiting element is mounted on the lock hook 110. When the lock hook 110 rotates, it causes the position of the limiting element to change and abut against the latch 200, thereby limiting the reset of the lock hook 110. As the latch 200 and the lock hook 110 move relative to each other, the limiting element separates from the latch 200, and the lock hook 110 resets under the action of the elastic element 130.

[0038] Mounting bracket 100 provides mounting space for locking hook 110. Mounting bracket 100 is fixed to panel 300 or chassis 400. In this application, as... Figure 1 As shown, the mounting bracket 100 is fixed to the chassis 400. The mounting bracket 100 can adopt any structure such as plate, block, or groove, as long as it can facilitate the installation of the locking hook 110.

[0039] like Figure 6 As shown, the locking hook 110 of this application is generally similar to a "hoe" structure. One end of the locking hook 110 has a hook-shaped structure 111, which is used to hook and connect with the latch 200. A wedge-shaped guide surface 112 is also provided on the outer side of the hook-shaped structure 111. When an external force contacts the guide surface 112, it can force the locking hook 110 to rotate, thus facilitating the self-locking of the locking hook 110 and the latch 200. The locking hook 110 is designed with an inclined surface. When the panel 300 is closed, the horizontal force F of the latch 200 contacts the locking hook 110 and is decomposed into F1 / F2. F1 causes the locking hook 110 to move upward. After the latch 200 passes the locking hook 110 along the inclined surface, the locking hook 110 returns to its original position under the action of a spring, completing the self-locking function when the door is closed. The angle of the guide surface 112 of the locking hook 110 is designed between 0° and 90°. The larger the angle, the smaller the required pushing force F. The angle of the inclined surface can be appropriately selected according to the needs of the scenario.

[0040] The middle part of the locking hook 110 is hinged to the mounting bracket 100 via a connecting shaft. When an external force is applied to the other end of the locking hook 110, it can drive the end of the locking hook 110 with the hook-shaped structure 111 to rotate, thereby unlocking the locking hook 110 and the latch 200. The elastic element 130 is a spring. One end of the spring is fixed to the mounting bracket 100, and the other end of the spring is fixed to the locking hook 110. The connection end of the spring and the locking hook 110 can be close to the hook-shaped structure 111 or close to the other end of the hook-shaped structure 111. Depending on the different connection positions of the spring, a tension spring or a compression spring can be used to achieve the reset of the locking hook 110 after rotation. One end of the locking hook 110 cooperates with the latch 200, and the other end of the locking hook 110 is provided with a rotating element 140 for driving the locking hook 110 to rotate along its hinge point with the mounting bracket 100.

[0041] To facilitate the rotation of the locking hook 110 along its hinge point with the mounting bracket 100, an external force needs to be applied to the other end of the locking hook 110. For this purpose, a rotating member 140 is connected to the other end of the locking hook 110. The rotating member 140 can be a push rod that moves along an arc. When the external force is applied to the rotating member 140, it drives the rotating member 140 to move, thereby enabling the locking hook 110 to rotate along its hinge point with the mounting bracket 100. Then, the hook-shaped structure 111 of the locking hook 110 can be separated from the latch 200, thereby unlocking both of them.

[0042] If the rotating component 140 adopts the above-described structure, it requires a large amount of space to move, which is not conducive to the concealed installation of the entire door lock. To facilitate the rotation of the lock hook 110 and to facilitate the concealed installation of the entire door lock, the rotating component 140 of this application includes a first connecting rod 142 and a second connecting rod 141 that are hinged to each other. The first connecting rod 142 is rotatably connected to the mounting bracket 100, and the second connecting rod 141 is hinged to the lock hook 110. When the first connecting rod 142 rotates, it drives the lock hook 110 to rotate along its hinge point with the mounting bracket 100. Figure 2 , 3 As shown, one end of the first link 142 is hinged to one end of the second link 141, and the other end of the second link 141 is hinged to the other end of the locking hook 110. The other end of the first link 142 is rotatably connected to the mounting bracket 100. Therefore, external force only needs to drive the hinge point between the first link 142 and the mounting bracket 100 to rotate, which in turn drives the first link 142 to rotate. The rotation of the first link 142, under the action of the second link 141, can drive the locking hook 110 to rotate along its hinge point with the mounting bracket 100. This configuration requires only a small installation space to convert external force into a driving force for the locking hook 110 to rotate, thus achieving the purpose of rotating the locking hook 110.

[0043] To facilitate the rotation of the first link 142, this application has a drive pin 143 fixed at one end of the first link 142. The drive pin 143 is rotatably connected to the mounting bracket 100 through a bearing or other connection method. When the drive pin 143 rotates, it can drive the first link 142 to rotate, thereby realizing the rotation of the lock hook 110.

[0044] Since the maintenance of the entire equipment requires specific personnel, to prevent the chassis 400 and panel 300 from being opened arbitrarily in the presence of unauthorized personnel, such as Figure 4 As shown, this application provides a non-circular insertion hole 1431 on the drive pin 143. The insertion hole 1431 is used to connect with the drive component. An external force is applied to the drive component to drive the drive pin 143 to rotate. The drive component can be a key with a specific structure. After the drive component is connected to the drive pin 143, an external force is applied to the drive component to drive the drive pin 143 to rotate, thereby achieving the purpose of rotating the lock hook 110. To facilitate the connection between the drive component and the drive pin 143 and to drive the drive pin 143 to rotate, the insertion hole 1431 can be a non-circular hole such as a square hole, hexagonal hole, or octagonal hole. The drive component is provided with a pin that mates with the insertion hole 1431. Rotating the pin drives the drive pin 143 to rotate. The rotation of the drive pin 143, under the action of the first connecting rod 142 and the second connecting rod 141, drives the lock hook 110 to rotate, thereby unlocking the lock hook 110 and the latch 200.

[0045] The rotation angle of the locking hook 110 needs to be limited. Therefore, an angle limiting mechanism can be provided on the mounting bracket 100. This angle limiting mechanism can consist of two limiting posts, etc. By placing the two limiting posts on both sides of the rotation path of the locking hook 110, the rotation angle of the locking hook 110 can be limited. Alternatively, the angle limiting mechanism can also be installed in conjunction with the first connecting rod 142 to limit the rotation angle of the first connecting rod 142, thus also limiting the rotation angle of the locking hook 110. In this application, the mounting bracket 100 is provided with a positioning structure 150 to limit the rotation angle of the first connecting rod 142. Figure 2 As shown, the positioning structure 150 includes a first limiting protrusion 151 and a second limiting protrusion 152. The first limiting protrusion 151 and the second limiting protrusion 152 are located on both sides of the first connecting rod 142. The first limiting protrusion 151 has two functions: first, to ensure that the locking hook 110 is fixed in the reset position; and second, to ensure that the angle between the first connecting rod 142 and the second connecting rod 141 is less than 180° (to ensure that when the force of the second connecting rod 141 is transmitted to the second connecting rod 141, the first connecting rod 142 can rotate along the fixed end). The second limiting protrusion 152 is used to limit the maximum rotation angle of the first connecting rod 142, thereby limiting the rotation angle of the locking hook 110.

[0046] The locking hook 110 rotates to lock or unlock with the latch 200. To ensure sufficient rotational space for the locking hook 110, and to facilitate the engagement of the limiting component and the latch 200, such as... Figure 3 As shown, the latch 200 of this application includes a mounting part 220 and a door-shaped connecting part 210. The mounting part 220 is located at the opening end of the door-shaped connection. The transverse section of the connecting part 210 is a cylindrical structure. The connecting part 210 and the hook-shaped structure 111 of the latch 110 cooperate to lock or unlock the latch 200.

[0047] To enable the limiting component to move independently after the locking hook 110 rotates, the limiting component of this application includes a limiting block 120. The limiting block 120 is rotatably connected to the locking hook 110. In use, the limiting block 120 is vertically or inclined. The upper end of the limiting block 120 is rotatably connected to the locking hook 110. When the locking hook 110 rotates, the hook-shaped structure 111 of the locking hook 110 actually rotates upwards and separates from the connecting part 210. At this time, the limiting block 120 rotates along the locking hook 110 under the action of gravity. Since the limiting block 120 only has two effects during use—limiting the locking hook 110 from resetting and not affecting the resetting of the locking hook 110—it has a locked state and an unlocked state during rotation. When the limiting block 120 is in the locked state, it abuts against the latch 200; when the limiting block 120 is in the unlocked state, it contacts the latch 200. Figure 7As shown, when the limiting block 120 is vertically set, the bottom of the limiting block 120 abuts against the vertical section of the connecting part 210, and the limiting block 120 is in a locked state at this time. When the latch 200 moves with the panel 300, the abutment between the limiting block 120 and the latch 200 disappears. At this time, the latch hook 110 will be reset under the action of the elastic element 130, and the panel 300 will close towards the housing 400, causing the latch 200 to move towards the latch hook 110. At this time, the end of the vertical section of the connecting part 210 of the latch 200 will contact the lower part of the limiting block 120, causing the limiting block 120 to rotate along the latch hook 110. Only after the latch hook 110 and the latch 200 are connected, the state shown in the figure is obtained, which is the unlocked state of the limiting block 120.

[0048] To achieve the abutment between the limiting block 120 and the latch 200, and also to ensure that the latch 200 can contact the limiting block 120 and drive the limiting block 120 to rotate along the latch 110 when it moves toward the latch hook 110, in this application, one end of the latch hook 110 is provided with a hook-shaped structure 111, and a rotating pin 121 is provided on the latch hook 110 at or adjacent to the hook-shaped structure 111. The limiting block 120 is rotatably connected to the latch hook 110 through the rotating pin 121, and the limiting block 120 is rotatably set along the central axis of the rotating pin 121. When the limiting block 120 is rotated to the locked state, the limiting block 120 contacts the latch 200, and the end of the hook-shaped structure 111 is spaced apart from the latch 200. In this embodiment, the rotating pin 121 can be fixedly connected to the locking hook 110, and the rotating pin 121 can be rotatably connected to the limiting block 120; alternatively, the rotating pin 121 can be rotatably connected to the locking hook 110, and the rotating pin 121 can be fixedly connected to the limiting block 120, both of which enable the rotatable connection between the limiting block 120 and the locking hook 110. In this embodiment, as shown... Figure 2 , 3 As shown in Figure 4, the rotating pin 121 is fixed at the bent part of the hook-shaped structure 111 of the locking hook 110, and the rotating pin 121 passes through the limiting block 120 and is rotatably connected to the limiting block 120.

[0049] To ensure that when the limiting block 120 is connected to the connecting part 210, the end of the hook-shaped structure 111 of the locking hook 110 is spaced apart from the connecting part 210, the length of the limiting block 120 can be limited according to the structure of the connecting part 210. When the height of the entire gate-shaped structure of the connecting part 210 is at the same horizontal plane, the rotation point of the limiting block 120 farthest from the center of the rotating pin 121 is actually the distance from the bottom of the limiting block 120 to the center of the rotation axis. By limiting the length of the limiting block 120, when the locking hook 110 rotates upward and the limiting block 120 is in a locked state under the action of gravity, the limiting block 120 first contacts the vertical section of the gate-shaped connecting part 210, while the end of the hook-shaped structure 111 of the locking hook 110 is spaced apart from the horizontal section of the connecting part 210. Of course, when the height of the horizontal section of the gate-shaped connecting part 210 is lower than the height of the vertical section of the gate-shaped connecting part 210, such as... Figure 6 As shown, assuming the distance from the center of the rotating pin 121 to the bottom of the limiting block 120 is c, the length of the hook-shaped structure 111 of the locking hook 110 is b, and the height difference between the horizontal and vertical sections of the portal structure of the connecting part 210 is a, then a, b, and c satisfy the formula a > cb. This ensures that when the limiting block 120 is vertically downward and in contact with the vertical section of the portal structure of the connecting part 210, the end of the hook-shaped structure 111 of the locking hook 110 is spaced apart from the horizontal section of the connecting part 210, thereby limiting the locking hook 110 by the limiting block 120.

[0050] To facilitate the smooth rotation of the limiting block 120 under gravity, this application includes a gravity component 123 connected to the limiting block 120 to drive the limiting block 120 to move towards the latch 200. Figure 5 , 6 As shown in Figure 7, the gravity part 123 is located near the lower part of the limiting block 120. When the locking hook 110 rotates upward, the limiting block 120 will separate from the vertical section of the connecting part 210. Then, under the action of gravity and the gravity part 123, the limiting block 120 rotates downward, so that the bottom of the limiting block 120 abuts against the top of the vertical section of the connecting part 210. At this time, the hook-shaped bottom of the locking hook 110 is spaced from the horizontal section (or vertical section) of the connecting part 210, which can prevent the locking hook 110 from locking the latch 200. At this time, the external force that drives the locking hook 110 to rotate can be removed for the opening and closing operation of the panel 300.

[0051] To limit the position of the locking block 120, this application provides a limiting structure between the locking block 120 and the locking hook 110 to limit the rotation angle of the locking block 120. The limiting structure includes a rotating protrusion 122 on the locking block 120 and a limiting groove 113 on the locking hook 110. The rotating protrusion 122 rotates with the locking block 120 and contacts the limiting groove 113, thus keeping the locking block 120 in the locked state. Figure 3 , 4As shown, a fan-shaped rotating protrusion 122 protruding towards the locking hook 110 is provided at the position where the upper end of the limiting block 120 is connected to the rotating pin 121. A limiting groove 113 is provided at the top of the hook-shaped structure 111 of the locking hook 110. The limiting groove 113 makes the top of the hook-shaped structure 111 have a stepped structure. When the limiting block 120 is in the locked state, the rotating protrusion 122 integrates and abuts against the stepped side wall of the limiting groove 113, thereby ensuring that the limiting block 120 can be in the same locked state under the action of the rotating locking hook 110 during each use.

[0052] The principle of this application:

[0053] like Figure 5 As shown, the panel 300 and the chassis 400 are locked in this state. At this time, the connecting part 210 of the locking hook 110 and the locking buckle 200 are attached and connected.

[0054] The operator inserts the drive component into the drive pin 143 and applies force to the drive component. The drive component and drive pin 143 rotate. The rotation of drive pin 143, through the first link 142 and the second link 141, can drive the lock hook 110 to rotate along its hinge point with the mounting bracket 100. The rotation of lock hook 110 causes the hook-shaped structure 111 of lock hook 110 to separate from the connection part 210 of lock buckle 200, thereby unlocking lock hook 110 and lock buckle 200.

[0055] The locking hook 110 rotates upward, causing the limiting block 120 to rotate. The limiting block 120 rotates and separates from the connecting part 210 of the latch 200. Under the action of gravity, the limiting block 120 rotates along the locking hook 110 to the state shown in Figure 7. At this time, the bottom of the limiting block 120 abuts against the upper surface of the vertical section of the door-shaped connecting part 210, thus limiting the locking hook 110 to the latch 200 in this state. At this time, the external force applied by the operator to the driving component disappears, and the locking hook 110 will not return to its original position and lock with the latch 200, thus completing the unlocking of the panel 300 and the chassis 400.

[0056] The operator opens the panel 300, causing the latch 200 to move. The latch 200 moves and separates from the limit block 120. The resistance between the limit block 120 and the latch 200 disappears, thus unlocking the limit member and the hook 110. At this time, the hook 110 has no other external force, and the elastic member 130 will drive the hook 110 to reset.

[0057] When panel 300 needs to be closed, latch 200 on panel 300 moves toward latch hook 110. When the connecting part 210 of latch 200 contacts latch 200, such as Figure 8As shown, the continuous movement of the latch 200 generates a thrust, which forces the hook 110 to rotate. After the hook 110 rotates to the top of the lateral section of the connecting part 210, the panel 300 closes in place. Under the action of the elastic element 130, the hook 110 resets and hangs on the connecting part 210 of the latch 200, realizing the self-locking of the latch 200 and the hook 110, and completing the locking of the panel 300 and the chassis 400.

[0058] Based on the working principle of the locking hook 110 and the latch 200, the limiting component of this application can limit the locking hook 110. Even after unlocking, when the external force disappears, it can prevent the locking hook 110 from connecting with the latch 200 again when the panel 300 is not opened, thus avoiding the problem of unlocking failure. At the same time, the existence of the limiting component does not affect the self-locking between the panel 300 and the chassis 400 after the panel 300 is opened, making the door lock of this application more suitable for use in the chassis of hemodialysis equipment.

[0059] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0060] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0061] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A concealed self-latching door lock characterized by: Includes a mounting bracket (100), a locking hook (110), a locking buckle (200), an elastic element (130), and a limiting element. The locking hook (110) is rotatably mounted on the mounting bracket (100). The elastic element (130) is located between the mounting bracket (100) and the locking hook (110) and is used to drive the locking hook (110) to reset. The latch (200) and the hook (110) work together to unlock or lock. The limiting member is installed on the lock hook (110). When the lock hook (110) rotates, it causes the position of the limiting member to change and abut against the lock buckle (200), which is used to limit the lock hook (110) from resetting. As the lock buckle (200) and the lock hook (110) move relative to each other, the limiting member separates from the lock buckle (200), and the lock hook (110) resets under the action of the elastic member (130).

2. The concealed self-latching door lock of claim 1, wherein: The limiting component includes a limiting block (120), which is rotatably connected to the locking hook (110), and the limiting block (120) can rotate along the locking hook (110) to have a locked state and an unlocked state. When the limit block (120) is in the locked state, the limit block (120) abuts against the latch (200). When the limit block (120) is in the unlocked state, the limit block (120) contacts the latch (200).

3. The concealed self-latching door lock of claim 2, wherein: One end of the locking hook (110) is provided with a hook-shaped structure (111), and a rotating pin (121) is provided on the locking hook (110) at or adjacent to the hook-shaped structure (111). The limiting block (120) is rotatably connected to the locking hook (110) through the rotating pin (121), and the limiting block (120) is rotatably set along the central axis of the rotating pin (121). When the limiting block (120) is rotated to the locked state, the limiting block (120) contacts the latch (200), and the end of the hook structure (111) is spaced apart from the latch (200).

4. A concealed self-latching door lock according to claim 2 or 3, characterized in that: A gravity part (123) is connected to the limiting block (120) for driving the limiting block (120) to move toward the latch (200).

5. The concealed self-locking door lock according to claim 4, characterized in that: A limiting structure is provided between the limiting block (120) and the locking hook (110) to limit the rotation angle of the limiting block (120). The limiting structure includes a rotating protrusion (122) provided on the limiting block (120) and a limiting slot (113) provided on the locking hook (110). The rotating protrusion (122) rotates with the limiting block (120) and contacts the limiting slot (113), and the limiting block (120) is in a locked state.

6. The concealed self-latching door lock of claims 1, 2, 3, or 5, wherein: The middle part of the locking hook (110) is hinged to the mounting bracket (100), one end of the locking hook (110) is engaged with the lock buckle (200), and the other end of the locking hook (110) is provided with a rotating part (140) for driving the locking hook (110) to rotate along its hinge point with the mounting bracket (100).

7. The concealed self-latching door lock of claim 6, wherein: The rotating component (140) includes a first link (142) and a second link (141) that are hinged to each other. The first link (142) is rotatably connected to the mounting bracket (100), and the second link (141) is hinged to the locking hook (110). When the first link (142) rotates, it causes the locking hook (110) to rotate along its hinge point with the mounting bracket (100).

8. The concealed self-latching door lock of claim 7, wherein: The first link (142) is fixed with a drive pin (143). The drive pin (143) is rotatably connected to the mounting bracket (100). When the drive pin (143) rotates, it drives the first link (142) to rotate.

9. The concealed self-latching door lock of claim 8, wherein: The drive pin (143) is provided with a non-circular insertion hole (1431), which is used to connect with the drive component. An external force is applied to the drive component to drive the drive pin (143) to rotate.

10. A concealed self-latching door lock according to any one of claims 7-9, characterized in that: The mounting bracket (100) is provided with a positioning structure (150) that limits the rotation angle of the first link (142).

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