A concealed door lock structure

Abstract

The utility model relates to a hidden door lock structure, including hidden doorknob and door lock assembly, door lock assembly includes lock body, lock bolt, lock catch, unlocking spring and limiting spring. Hidden doorknob is hinged on the casing to rotate between the hidden position and the trigger position, the operating window is established on the casing for contacting and operating hidden doorknob, in the hidden position, hidden doorknob closes operating window, in the trigger position, hidden doorknob contacts and drives lock catch to rotate, makes the limiting protrusion to get out of the limiting groove, thereby unlocking spring drives lock bolt to rotate to the unlocking position. The utility model discloses the pure mechanical keyless scheme of " hidden doorknob + double spring linkage lock catch - lock bolt", and the operation and maintenance personnel only need to stretch into operating window and stir hidden doorknob to complete " limiting protrusion to get out of - lock bolt automatic pop - unlock " action one time, not only has saved the trouble of carrying and managing a large number of special keys, but also utilizes hidden doorknob to close operating window under the non - use state, makes the lock hole completely " invisible ".

Description

Technical Field

[0001] This utility model belongs to the field of door lock technology, and in particular relates to a concealed door lock structure. Background Technology

[0002] In enclosed devices requiring frequent maintenance, such as financial self-service terminals, express delivery lockers, and smart vending machines, door locks must ensure daily security while also meeting the high-frequency opening needs of maintenance personnel. In these scenarios, carrying and managing a large number of dedicated keys significantly reduces maintenance efficiency; therefore, "keyless quick unlocking" has become an essential industry requirement.

[0003] To meet these needs, some "keyless quick-unlocking" door lock structures have emerged on the market: utilizing exposed manual components such as knobs, levers, buttons, or wrenches, the bolt is directly driven back by rotating, pressing, or flicking actions, achieving keyless unlocking. This type of structure is simple, low-cost, and intuitive to operate, and has been widely used in various cabinet doors, compartments, and access panels that require frequent opening.

[0004] However, the aforementioned keyless door lock structures all expose the operating components on the surface of the device, which can be easily found and opened by non-professionals, posing risks of misoperation, malicious damage, or theft. At the same time, the exposed knobs / buttons disrupt the overall appearance and aesthetics of the machine, making it difficult to meet the requirements of "invisible" design in high-end commercial scenarios. Utility Model Content

[0005] This utility model aims to at least partially solve one of the technical problems in the related art.

[0006] Therefore, one aspect of this application proposes a concealed door lock structure, comprising: The concealed handle is designed to be installed inside the casing. A door lock assembly is disposed within the housing; the door lock assembly includes: A lock body is used to secure the housing. A latch, hinged to the lock body, is used to rotate between a locked position and an unlocked position; the latch is provided with a limit groove; An unlocking spring, connected to the bolt, is used to move the bolt to the unlocked position; The latch is hinged to the lock body and has a limit protrusion. A limiting spring, connected to the latch, is used to drive the latch to rotate, so that the limiting protrusion is inserted into the limiting groove to restrict the latch to the locked position; The concealed handle is hinged to the housing and can rotate between a concealed position and a triggered position; the housing is provided with an operation window for contacting and operating the concealed handle. In the hidden position, the hidden handle closes the operating window; At the trigger position, the hidden latch contacts and drives the latch to rotate, causing the limiting protrusion to disengage from the limiting groove, thereby the unlocking spring drives the bolt to rotate to the unlock position.

[0007] In the technical solution, the structure is designed as a purely mechanical keyless solution consisting of a "hidden handle + double spring linkage latch - lock tongue". Maintenance personnel only need to reach into the operating window and move the hidden handle to complete the "limiting protrusion disengages → lock tongue automatically pops up to unlock" action in one go. This not only eliminates the trouble of carrying and managing a large number of special keys, but also uses the hidden handle to close the operating window when not in use, making the lock hole completely "invisible". This fundamentally eliminates the risk of misoperation and malicious lock picking by non-professionals, while maintaining the integrity and aesthetics of the casing. It takes into account the triple requirements of efficiency, safety and appearance in the "high-frequency maintenance" scenario.

[0008] In some embodiments, the housing is provided with a door, and the door is provided with a retaining pin; The lock body is provided with a lock groove; in the locked position, the lock tongue restricts the locking pin in the lock groove to restrict the door body to the closed position.

[0009] In the technical solution, the structural design forms a secondary closure through "locking shaft-lock groove-locking tongue": the locking tongue directly locks the door's locking shaft in the lock groove, preventing the door from turning outward; once the locking tongue is lifted by the unlocking spring, the locking shaft can disengage from the lock groove, and the door can be opened freely; this structure serializes the two actions of "unlocking-opening", which not only ensures the mechanical strength when closing, but also seamlessly connects the opening action with the hidden handle triggering action, further improving operational efficiency and reliability.

[0010] In some embodiments, the door is hinged to the housing for rotation between an open position and a closed position; In the closed position, the door closes the hatch of the casing; In the open position, the door opens the hatch of the housing; The locking tongue is provided with a slot; in the locked position, the locking shaft is located in the slot; The opening of the lock groove faces towards the open position; when the lock tongue is in the unlocked position, the opening of the latch is outside the lock groove and faces towards the open position.

[0011] In the technical solution, the structural design directly opens a slot on the lock tongue, so that the door's locking shaft is placed in the slot. When the lock tongue rotates, the side wall of the slot applies a pushing force to the locking shaft, causing the locking shaft to move outward in the direction of the lock groove opening. At the same time as the locking shaft is pushed out, it drives the door to automatically swing outward, realizing the linkage effect of "unlocking and opening the door". Maintenance personnel do not need to apply secondary force to pull the door, which significantly improves the operational efficiency and convenience in high-frequency maintenance scenarios.

[0012] In some embodiments, the lock body is provided with a limiting seat; when the bolt abuts against the limiting seat, the limiting seat restricts the bolt to the unlocked position.

[0013] In the technical solution, the structural design adds a limiting seat to the lock body, so that the bolt is mechanically and hard-limited after unlocking, preventing it from continuing to over-rotate. This ensures that the bolt stops at the same angle after each unlocking, providing an accurate initial position for the next closing. When closing the door, the locking pin can accurately enter the slot and push the bolt to the locking position, quickly completing the locking.

[0014] In some embodiments, the latch is provided with a reset groove; when the latch is rotated to the unlock position, the limiting protrusion falls into the reset groove, and the angle position of the latch is the same as when the limiting protrusion is inserted into the limiting groove.

[0015] In the technical solution, the structural design allows the limiting protrusion to fall into the reset groove when unlocking, forcing the latch to maintain the same angle as the "locked position", thus preventing the latch from stopping at a random angle in the middle; as a result, the limiting torsion spring will not be continuously pushed by the latch for a long time, eliminating fatigue failure caused by the limiting torsion spring being under high stress for a long time in the unlocked state, significantly extending the service life of the door lock assembly and the reset reliability.

[0016] In some embodiments, the inner surface of the reset groove near the limiting groove is inclined to guide the limiting protrusion out of the reset groove.

[0017] In the technical solution, the structure is designed with the side of the reset groove near the limiting groove as an inclined surface, so that the limiting protrusion can slide along the inclined surface when the door is closed and naturally slide out of the reset groove, avoiding the "stuck" phenomenon.

[0018] In some embodiments, when the concealed latch is in the concealed position, the concealed latch contacts the latch.

[0019] In the technical solution, the structural design ensures that the hidden handle is in contact with the latch even when it is in the hidden position, forming a "zero-free travel" pre-compression state: as soon as the operator starts to move the hidden handle, the latch is immediately activated, eliminating the operational gap and shortening the unlocking response time; at the same time, the pre-compression contact can suppress the vibration and abnormal noise of the latch during transportation or equipment operation, improving the overall machine's quietness and user experience.

[0020] In some embodiments, the concealed handle is connected to a closed spring for driving the concealed handle to rotate, so that the concealed handle presses against the inner surface of the housing to reset the concealed handle to the concealed position.

[0021] In the technical solution, the structural design incorporates a closed spring that automatically presses the hidden handle against the inner surface of the housing the moment the external force disappears. This ensures that the operating window is securely sealed, maintaining a stable hidden state and preventing dust, insects, or liquids from entering. Furthermore, it keeps the handle in a pre-tensioned elastic state, preventing accidental locking caused by the hidden handle sliding in due to vibration when used on mobile devices such as vehicles and ships. This improves the reliability and security of the door lock in harsh environments.

[0022] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0023] The accompanying drawings, which are included to provide a further understanding of the present invention and form part of this application, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the concealed door lock structure according to an embodiment of this application on the housing. Figure 2 This is a schematic diagram of the concealed door lock structure in the locked state according to the embodiments of this application; Figure 3 This is a partially enlarged view of the concealed door lock structure according to the embodiments of this application in a locked state with the lock body partially hidden; Figure 4 This is a schematic diagram of the concealed door lock structure in the unlocked state according to an embodiment of this application. Figure 5 This is a magnified view of the concealed door lock structure according to an embodiment of this application in the unlocked state with part of the lock body hidden.

[0024] In the diagram: 1. Concealed handle; 2. Door lock assembly; 21. Lock body; 211. First pivot; 212. Second pivot; 213. Lock groove; 214. Limit seat; 22. Lock tongue; 221. Limit groove; 222. Snap groove; 223. Reset groove; 224. Bevel; 23. Locking latch; 231. Limit protrusion; 24. Limit spring; 3. Housing; 31. Operating window; 4. Door body; 41. Snap shaft; 5. Closing spring. Detailed Implementation

[0025] The technical solutions in 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. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0026] In the description of this utility model, it should be understood that the terms "center", "lateral", "longitudinal", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. 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.

[0027] The terms "first," "second," and "third" 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. Therefore, a feature defined as "first," "second," or "third" may explicitly or implicitly include one or more of that feature.

[0028] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0029] like Figures 1 to 5 As shown in an illustrative embodiment of the concealed door lock structure of this utility model, the concealed door lock structure includes a concealed handle 1 and a door lock assembly 2.

[0030] It should be noted that the concealed door lock structure is used in cabinet equipment such as financial self-service terminals, express delivery lockers, and smart vending machines that require frequent opening and closing for maintenance. The cabinet equipment usually has a housing 3 and a door 4. The housing 3 is the outer shell of the cabinet equipment. The housing 3 usually has a compartment inside, and the hatch of the compartment faces the outside of the housing 3. The door 4 is usually hinged to the housing 3, so that the compartment can be opened or closed by rotating the door 4.

[0031] Both the concealed handle 1 and the door lock assembly 2 are hidden inside the housing 3. The concealed handle 1 is the operating component used to trigger unlocking. The door lock assembly 2 can complete keyless unlocking and automatic reset when triggered by the concealed handle 1, thereby realizing the unlocking and locking of the door 4.

[0032] The door lock assembly 2 includes a lock body 21, a bolt 22, a latch 23, an unlocking spring, and a limit spring 24.

[0033] The lock body 21 is fixed to the housing 3, thus achieving the fixed installation of the door lock assembly 2 inside the housing 3.

[0034] The latch 22 is hinged to the lock body 21, allowing it to move between a locked position and an unlocked position. When the latch 22 is in the locked position, it restricts the door body 4 from moving in the opening direction, keeping it in a locked state. When the latch 22 is in the unlocked position, the restriction on the door body 4 is removed, allowing the door body 4 to move freely to open the compartment. The latch 22 is provided with a limit groove 221, which is typically located on the outer circumferential surface of the latch 22.

[0035] The latch 23 is hinged to the lock body 21 and is provided with a limiting protrusion 231. The limiting protrusion 231 is usually provided on the outer peripheral surface of the latch 23, so that the limiting protrusion 231 rotates synchronously with the rotation of the latch 23.

[0036] An unlocking spring (not shown in the attached diagram) is typically mounted on the lock body 21 and connected to the bolt 22. When the bolt 22 is in the locked position, the unlocking spring is in an elastic deformation state, so that after the bolt 22 is unrestrained, the unlocking spring can drive the bolt 22 to rotate to the unlocked position.

[0037] A limiting spring 24 is typically mounted on the lock body 21 and connected to the latch 23. When the door 4 is in the locked state, the limiting protrusion 231 on the latch 23 is inserted into the limiting groove 221, preventing the latch 23 from rotating towards the unlocked position through the cooperation of the limiting protrusion 231 and the limiting groove 221. This keeps the door locked and maintains the restriction on the door 4, keeping the door 4 in the locked state. Under non-external force, the latch 23 cannot overcome the torque of the limiting spring 24, causing the limiting protrusion 231 to remain inserted into the limiting groove 221, maintaining the restriction of the latch 23 on the latch 22.

[0038] The lock body 21 typically has a first pivot 211 and a second pivot 212. The latch 23 and the bolt 22 are respectively fitted onto the first pivot 211 and the second pivot 212, so that the latch 23 rotates around the first pivot 211 and the bolt 22 rotates around the second pivot 212. The unlocking spring is typically a torsion spring fitted onto the second pivot 212, with its two ends connected to the bolt 22 and the lock body 21, respectively, so that the bolt 22 undergoes elastic deformation or intensifies elastic deformation when it rotates relative to the lock body 21. The limiting spring 24 is typically a torsion spring fitted onto the first pivot 211, with its two ends connected to the lock opening and the lock body 21, respectively, so that the latch 23 undergoes elastic deformation or intensifies elastic deformation when it rotates relative to the lock body 21.

[0039] The concealed handle 1 is hinged to the housing 3, allowing it to rotate between a concealed position and an activated position. The housing 3 is provided with an operation window 31, which connects the interior and exterior spaces of the housing 3. Maintenance personnel can reach into the housing 3 through the operation window 31 to access the concealed handle 1 and operate it.

[0040] When the concealed handle 1 is in the concealed position, it closes the operating window 31. The operating window 31 is usually located on the flat structure of the housing 3. The concealed handle 1 usually has an operating part, which is a flat structure and its surface area is usually larger than that of the operating window 31. When the concealed handle 1 is in the concealed position, the operating part is attached to the inner surface of the housing 3, thereby closing the operating window 31.

[0041] Under the operation of maintenance personnel, the operating part of the hidden handle 1 is pushed towards the inside of the housing 3, causing the hidden handle 1 to contact and push the latch 23. The latch 23 rotates against the torque of the limiting spring 24, causing the limiting protrusion 231 to disengage from the limiting groove 221. The latch 22 loses its constraint and rotates to the unlocked position under the drive of the unlocking spring. The restriction of the latch 22 on the door 4 is removed, and the door 4 can move freely to open the compartment. After the limiting protrusion 231 disengages from the limiting groove 221, it slides on the outer surface of the latch 22, causing the latch 22 to push against it. The latch 23 remains in a certain angle of rotation due to being pushed, causing the limiting spring 24 to undergo elastic deformation or intensified elastic deformation. The limiting groove 221 is usually a V-shaped groove, allowing the limiting protrusion 231 to disengage from the limiting groove 221 through rotational movement.

[0042] When the door 4 needs to be restored to the locked state, close the door 4 to seal the compartment. At the same time, manually push the latch 22 to move to the locked state. The limit groove 221 returns to the position aligned with the limit protrusion 231. Under the elastic force of the limit spring 24, the latch 23 rotates, causing the limit protrusion 231 to insert back into the limit groove 221, restoring the constraint on the latch 22, and resetting the latch 22 to the locked state, thereby restoring the locking of the door 4.

[0043] This structural design achieves a keyless door lock solution through a purely mechanical structure. Maintenance personnel only need to reach into the operation window 31 and push (inward) the hidden handle 1 to complete the "limiting protrusion 231 disengages → lock tongue 22 automatically pops up to unlock" action in one go. This not only eliminates the trouble of carrying and managing a large number of special keys, but also uses the hidden handle 1 to close the operation window 31 when not in use, making the lock hole completely "invisible". This fundamentally eliminates the risk of misoperation and malicious lock picking by non-professionals, while maintaining the integrity and aesthetics of the casing 3. It takes into account the triple requirements of efficiency, safety and appearance in the "high-frequency maintenance" scenario.

[0044] In some embodiments, a retaining pin 41 is provided on the door body 4. A lock groove 213 is provided on the lock body 21. When the door body 4 is locked, the retaining pin 41 is located in the lock groove 213, and the latch 22 is located inside the retaining pin 41, preventing the retaining pin 41 from moving in the opening direction. This restricts the retaining pin 41 within the lock groove 213, thereby restricting the door body 4 to the closed position and keeping the door body 4 in a locked state. The opening of the lock groove 213 is generally oriented towards the direction in which the retaining pin 41 moves when the door body 4 is opened (i.e., the opening direction), so that when the latch 22 releases its constraint on the door body 4, the retaining pin 41 can move out of the lock groove 213 in the opening direction.

[0045] This structural design allows the latch 22 to directly lock the door body 4 and the locking shaft 41 into the lock groove 213. The door body 4 is not only restricted by the latch 22 in the opening and closing direction, but also by the lock groove 213 in another direction perpendicular to the opening and closing direction, forming a secondary locking mechanism. This prevents the door body 4 from rotating in the opening direction, ensuring the mechanical strength and stability of the door body 4 when closed. Once the limiting protrusion 231 disengages from the limiting groove 221, the latch 22 is lifted by the unlocking spring, and the locking shaft 41 can disengage from the lock groove 213, allowing the door body 4 to open freely. The "unlocking-opening" action is serialized, and the opening action is seamlessly connected with the triggering action of the hidden handle 1, further improving operational efficiency and reliability.

[0046] In some embodiments, the door 4, hinged to the housing 3, rotates between an open position and a closed position. When the door 4 is in the closed position, the door 4 closes the hatch; when the door 4 is in the open position, the door 4 opens the hatch.

[0047] The latch 22 is provided with a slot 222. When the latch 22 is in the locked position, the locking pin 41 is located in the lock groove 213 and also in the slot 222 of the latch 22. The opening of the lock groove 213 faces the direction closer to the open position (i.e., towards the opening direction). When the latch 22 moves from the locked position to the unlocked position, the latch 22 moves to a certain extent towards the opening direction of the door 4, thereby pushing the locking pin 41 outward through the inner wall of the slot 222, causing the locking pin 41 to move out of the lock groove 213; further, when the latch 22 moves to the unlocked position, the opening of the slot 222 moves outside the lock groove 213 and faces towards the opening direction of the door 4, so that the locking pin 41, which is pushed away from the lock groove 213 by the latch 22, further disengages from the slot 222, completely releasing the door 4, allowing the door 4 to open freely.

[0048] This structural design allows the door to move in four directions via the locking pivot 41 when unlocking, achieving a "unlock and open" linkage effect. Maintenance personnel do not need to apply force to pull the door again, significantly improving operational efficiency and convenience in high-frequency maintenance scenarios.

[0049] In some embodiments, a limiting seat 214 is provided on the lock body 21. Under the elastic force of the unlocking spring, the bolt 22 abuts against the limiting seat 214, and the limiting seat 214 restricts the bolt 22 to the unlocked position, thereby preventing the limiting seat 214 from rotating further.

[0050] This structural design ensures that the latch 22 is mechanically and rigidly stopped after unlocking, preventing it from continuing to over-rotate. This ensures that the latch 22 stops at the same angle after each unlocking. When closing the door again, the opening of the slot 222 on the latch 22 can face the pivot 41, allowing the pivot 41 to smoothly enter the latch 22 and push the latch 22 back to the locked position. There is no need to push the latch 22 separately; simply pushing the door will restore the door 4 to its locked position, thus quickly completing the locking process.

[0051] In some embodiments, the latch 22 is provided with a reset groove 223, which is typically located on the outer circumferential surface of the latch 22. When the latch 22 rotates from the locked position to the unlocked position, the limiting protrusion 231 disengages from the limiting groove 221 and falls into the adjacent reset groove 223. When the limiting protrusion 231 is inserted into the limiting groove 221 and when the limiting protrusion 231 is inserted into the reset groove 223, the angular position of the latch 23 is the same, that is, the latch 23 is restored to its initial state. In the initial state, the limiting spring 24 is in a natural state or a state with small elastic deformation.

[0052] This structural design ensures that the latch 23 maintains the same angle as the "locked position" when unlocking, preventing the limiting protrusion 231 from remaining on the outer circumferential surface of the latch 23 outside the limiting groove 221. This prevents the latch tongue 22 from pushing the latch 23 for an extended period through the limiting protrusion 231, thereby preventing the limiting spring 24 from being in a state of elastic deformation or large elastic deformation for a long time, preventing fatigue failure of the limiting spring 24, ensuring that the latch 23 can reliably reset, and thus significantly extending the service life of the door lock assembly 2.

[0053] In some embodiments, the inner surface of the reset groove 223 near the limiting groove 221 is an inclined surface 224, that is, one end of the inclined surface 224 extends to the inner bottom surface of the reset groove 223, and the other end extends to the end of the opening of the reset groove 223 near the limiting groove 221. When the latch 22 rotates to the locked position, the limiting protrusion 231 slides along the inclined surface 224, thereby disengaging from the reset groove 223 and smoothly falling back into the limiting groove 221. This structural design allows the limiting protrusion 231 to slide naturally out of the reset groove 223 when the door 4 returns to the locked state, preventing the limiting protrusion 231 from being difficult to disengage in the reset groove 223 and thus hindering the movement of the latch 22, thereby avoiding jamming.

[0054] In some embodiments, when the concealed handle 1 is in the concealed position, it contacts the latch 23. This structural design ensures that once the concealed handle 1 is pushed inward by maintenance personnel, the latch 23 immediately rotates, thereby quickly triggering the latch 22 to pop out and unlock. There is no operational gap for the concealed handle 1, shortening the unlocking response time. Furthermore, the concealed handle 1's contact with the latch 23 creates a pre-compression contact, providing mutual support. This prevents vibration of the latch 23 and latch 22 during transport or operation, eliminating any resulting noise and improving overall noise reduction and user experience.

[0055] In some embodiments, the concealed handle 1 is connected to a closing spring 5. The closing spring 5 is typically a torsion spring, sleeved on the pivot where the concealed handle 1 is located, with its two ends connected to the concealed handle 1 and the housing 3, respectively. When the concealed handle 1 rotates from the concealed position to the triggered position, the closing spring 5 undergoes elastic deformation or increased elastic deformation, generating or increasing the elastic force acting on the concealed handle 1, so that when the concealed handle 1 is released, it pushes the concealed handle 1 back to the concealed position. Furthermore, under the push of the closing spring 5, the concealed handle 1 presses against the inner surface of the housing 3, stably closing the operating window 31. This structural design allows the closing spring 5 to automatically press the hidden handle 1 against the inner surface of the housing 3 the instant the external force disappears. On the one hand, this ensures that the operating window 31 is securely closed, maintaining a stable hidden state and preventing dust, insects, or liquids from entering the housing through the operating window 31. On the other hand, it keeps the handle in a pre-tensioned elastic state, preventing the hidden handle 1 from sliding into the housing 3 due to vibration when used on vehicles, ships, or other mobile equipment, thus avoiding false locking and improving the reliability and security of the door lock in harsh environments.

[0056] Finally, it should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0057] The above embodiments are only used to illustrate the technical solution of this utility model and not to limit it; although the utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of this utility model or equivalent substitutions can be made to some technical features without departing from the spirit of the technical solution of this utility model, and all such modifications and substitutions should be covered within the scope of the technical solution claimed by this utility model.

Claims

1. A concealed door lock structure, characterized in that, include: The concealed handle is designed to be installed inside the casing. A door lock assembly, for mounting within the housing; The door lock assembly includes: A lock body is used to secure the housing. A latch, hinged to the lock body, is used to rotate between a locked position and an unlocked position; the latch is provided with a limit groove; An unlocking spring, connected to the bolt, is used to move the bolt to the unlocked position; The latch is hinged to the lock body and is provided with a limit protrusion; A limiting spring, connected to the latch, is used to drive the latch to rotate, so that the limiting protrusion is inserted into the limiting groove to restrict the latch to the locked position; The concealed handle is hinged to the housing and can rotate between a concealed position and a triggered position; the housing is provided with an operation window for contacting and operating the concealed handle. In the hidden position, the hidden handle closes the operating window; At the trigger position, the hidden latch contacts and drives the latch to rotate, causing the limiting protrusion to disengage from the limiting groove, thereby the unlocking spring drives the bolt to rotate to the unlock position.

2. The concealed door lock structure according to claim 1, characterized in that, The housing is provided with a door, and the door is provided with a retaining shaft; The lock body is provided with a lock groove; in the locked position, the lock tongue restricts the locking pin in the lock groove to restrict the door body to the closed position.

3. The concealed door lock structure according to claim 2, characterized in that, The door is hinged to the housing and is used to rotate between the open and closed positions; In the closed position, the door closes the hatch of the casing; In the open position, the door opens the hatch of the housing; The locking tongue is provided with a slot; in the locked position, the locking shaft is located in the slot; The opening of the lock groove faces towards the open position; when the lock tongue is in the unlocked position, the opening of the latch is outside the lock groove and faces towards the open position.

4. The concealed door lock structure according to claim 3, characterized in that, The lock body is provided with a limiting seat; when the lock tongue abuts against the limiting seat, the limiting seat restricts the lock tongue to the unlocked position.

5. The concealed door lock structure according to claim 1, characterized in that, The latch is provided with a reset groove; when the latch is rotated to the unlock position, the limiting protrusion falls into the reset groove, and the angle position of the latch is the same as when the limiting protrusion is inserted into the limiting groove.

6. The concealed door lock structure according to claim 5, characterized in that, The inner surface of the reset groove near the limiting groove is inclined to guide the limiting protrusion out of the reset groove.

7. The concealed door lock structure according to claim 1, characterized in that, When the hidden handle is in the hidden position, the hidden handle contacts the latch.

8. The concealed door lock structure according to claim 1, characterized in that, The concealed handle is connected to a closed spring, which drives the concealed handle to rotate, so that the concealed handle presses against the inner surface of the housing, thereby resetting the concealed handle to the concealed position.

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