An automatic door lock with a forced reset function

Abstract

This utility model discloses an automatic door lock with a forced reset function, including a control board mounted on the housing and a drive motor, a ratchet protection mechanism, a gear transmission mechanism, and a push rod connected to it via transmission, as well as a first micro switch and a second micro switch electrically connected to the control board. The drive motor is electrically connected to the control board. The push rod is slidably connected to and limited by the housing, and is driven by the gear transmission mechanism. The push rod has a protrusion on its protrusion and a boss on its actuating end. A stop block is provided on the outside of the housing. In the initial state, the boss and the stop block abut against each other, and the protrusion abuts against the first micro switch. In the stopped state, the boss and the stop block separate, and the protrusion abuts against the second micro switch. When the force applied to the push rod during the reset process is too large, the boss and the stop block contact first to form a limit, which, in conjunction with the ratchet protection mechanism, can prevent the push rod from continuing to move and squeezing the housing, causing its rear part to deform and jamming. This can significantly extend the service life of the automatic door lock.

Description

Technical Field

[0001] This utility model relates to the field of door lock structure technology, specifically to an automatic door lock with a forced reset function. Background Technology

[0002] Most automatic door locks currently on the market lack a forced reset function. When the push rod is extended, the user cannot manually push it back to the starting position. This design flaw causes numerous inconveniences in practical use: for example, if an obstacle obstructs the door or a sudden power outage occurs, the user will be unable to close the door smoothly. If the user forces the door closed under such circumstances, the internal gear structure of the lock will be subjected to enormous pressure and impact, easily damaged, leading to the failure of the entire lock system. Furthermore, most automatic door locks on the market with a reset function use a spring or spring-loaded friction structure to achieve this function. This design undoubtedly increases the structural complexity of the lock and the difficulty of the manufacturing process, while also making the assembly process more cumbersome and the cost higher. On the other hand, automatic door locks generally have relatively long push rods and a relatively large overall lock size. However, the clearance between the push rod and the outer shell cannot be set too large. This design requirement is difficult to control precisely in actual production, resulting in defects in the outer shell structure design of many door lock products on the market. During use, the delay in stopping the drive motor causes the push rod to move excessively, squeezing the rear end of the outer shell and causing deformation. This leads to misalignment between the push rod slider and the rear end limit block of the outer shell, resulting in the door lock getting stuck inside. This severely shortens the lifespan of the door lock and causes inconvenience and additional economic burden for users. Utility Model Content

[0003] One technical problem this application aims to solve is to overcome the deficiencies of the above-mentioned related technologies and provide an automatic door lock with a forced reset function, which can achieve forced reset and prevent the automatic door lock from jamming due to deformation, thereby improving its service life.

[0004] The technical solution adopted by this utility model to solve the technical problem is as follows: an automatic door lock with a forced reset function, including a control board installed on the housing and a drive motor, a ratchet protection mechanism, and a gear transmission mechanism connected by transmission. The drive motor is electrically connected to the control board.

[0005] It also includes a push rod, a first micro switch and a second micro switch, the first micro switch and the second micro switch being electrically connected to the control board respectively;

[0006] The push rod is slidably connected to and limited by the housing, the push rod is connected to the gear transmission mechanism, the push rod is provided with a protrusion, the working end of the push rod is provided with a boss, and the outer side of the housing is provided with a stop block;

[0007] In the initial state, the boss and the stop block abut against each other, and the boss and the first micro switch abut against each other; in the suspended state, the boss and the stop block separate from each other, and the boss and the second micro switch abut against each other.

[0008] Compared with related technologies, this utility model has the following advantages: When the force applied to the push rod is too large due to the delay in stopping the drive motor during the reset process, the boss on the action end of the push rod can first abut against the stop block at the front end of the housing to form a limit, so that the push rod stops moving. This can avoid the existing door lock push rod squeezing the housing when it resets to the bottom, thereby avoiding deformation of the rear of the housing, and thus preventing the automatic door lock from jamming due to deformation, and improving the service life of the automatic door lock.

[0009] Preferably, the ratchet protection mechanism includes a worm gear with a recessed ratchet structure in the middle and a small toothed wheel with a pawl at the bottom. The worm gear is pivotally connected to the housing, and the small toothed wheel is coaxially pivotally connected to the worm gear. The pawl is installed within the ratchet structure and can cooperate with the ratchet structure to form friction transmission during the push rod extension process and gear meshing transmission during the push rod reset process. The worm gear is driven by a worm gear on the output shaft of the drive motor, and the small toothed wheel is driven by a gear transmission mechanism. The transmission connection between the worm gear and the ratchet protection mechanism can form a self-locking mechanism, effectively reducing the transmission speed while increasing the torque and improving transmission stability. In the event of a power outage, when the force on the push rod is greater than the frictional force of the friction transmission, due to the self-locking of the worm gear and the ratchet protection mechanism, the small toothed wheel can rotate within the ratchet structure, allowing the push rod to be forcibly reset and protecting the teeth of the worm gear and worm.

[0010] Preferably, the friction surface of the ratchet structure is provided with a serrated structure, and the serrated teeth of the serrated structure are arranged along the axial direction of the worm gear. The serrated structure ensures that sufficient basic friction is provided even when the ratchet protection mechanism is heated, ensuring that the door can be pushed open.

[0011] Preferably, the gear transmission mechanism includes a first double gear and a second double gear. The large gear of the first double gear meshes with a small gear, and the small gear of the first double gear meshes with the large gear of the second double gear. The small gear of the second double gear is connected to a rack on the push rod. The first and second double gears are pivotally connected to the housing. The meshing of multiple double gears reduces the transmission speed to a suitable level, improving the stability and service life of the automatic door lock.

[0012] Preferably, the control board is fixed to the housing, and the first and second microswitches are respectively fixed to the control board. The control board, the first microswitch, and the second microswitch form a module, and modular production can reduce costs and increase assembly speed.

[0013] Preferably, the housing is provided with a sliding groove, and multiple first limiting blocks are provided on both side walls of the sliding groove. Guide sliders are provided on both sides of the push rod. The guide sliders slide in engagement with the sliding groove, and the guide sliders cooperate with the first limiting blocks to limit the push rod on the sliding groove. This structure allows the push rod to move smoothly within the sliding groove.

[0014] Preferably, the cover has a first stop, and the push rod has a second stop in the middle. The second stop and the first stop cooperate to limit the push rod. When the second micro switch fails, the second stop and the first stop abut against each other to form a limit, preventing the push rod from being pushed out excessively and keeping the tail end of the push rod rack meshing with the second double gear. At this time, the worm gear in the ratchet protection mechanism is driven to rotate by the worm of the drive motor, and a small tooth stops rotating in the ratchet structure under the action of the second stop and the first stop abutting against each other to form a limit, resulting in slippage, but this can prevent damage to the automatic door lock.

[0015] Preferably, the cover and the housing are respectively provided with corresponding latches and hooks, and the cover and the housing are fixedly installed by the latches and hooks. It can also be used to hang the cover during maintenance. Attached Figure Description

[0016] Figure 1 This is a perspective view of the present invention;

[0017] Figure 2 This is a front view of the internal structure of this utility model in its initial state;

[0018] Figure 3 This is a front view of the internal structure of this utility model in its reset state;

[0019] Figure 4 This is a schematic diagram of the rear-view internal structure of this utility model;

[0020] Figure 5 This is a schematic diagram of the shell structure of this utility model;

[0021] Figure 6 This is a schematic diagram of the push rod structure of this utility model;

[0022] Figure 7 This is a structural schematic diagram of the ratchet protection mechanism of this utility model.

[0023] Attached Figures: 1. Housing; 10. Stop; 101. Sliding groove; 120. First limiting block; 14. Lock; 2. Control board; 3. Drive motor; 30. Worm gear; 4. Push rod; 40. Boss; 41. Protrusion; 42. Rack; 44. Slider; 45. Second stop; 46. Guide slider; 5. First micro switch; 6. Second micro switch; 7. Worm gear; 70. Ratchet structure; 71. Friction surface; 72. Abutment surface; 8. Pawl; 9. Small toothed gear; 10. First double gear; 11. Second double gear; 12. Housing cover; 120. Hook groove; 121. First stop. Detailed Implementation

[0024] First, those skilled in the art should understand that these embodiments are merely used to explain the technical principles of the embodiments of this application and are not intended to limit the scope of protection of the embodiments of this application. Those skilled in the art can make adjustments as needed to adapt to specific application scenarios.

[0025] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0026] like Figures 1-7 As shown, an automatic door lock with a forced reset function includes a housing 1 and a cover 12. A control board 2 mounted on the housing 1 is connected to a drive motor 3, a ratchet protection mechanism, a gear transmission mechanism, and a push rod 4, as well as a first micro switch 5 and a second micro switch 6. The drive motor 3 is electrically connected to the control board 2 via an external controller. The first micro switch 5 and the second micro switch 6 are respectively electrically connected to the control board 2. The push rod 4 is slidably connected to and limited by the housing 1. The push rod 4 is provided with a protrusion 41 and a rack 42, which is connected to the gear transmission mechanism. The upper and lower sides of the push rod 4 extending out of the housing 1 are provided with protrusions 40. A stop block 10 is provided on the outer side of the housing 1. In the initial state, the protrusions 40 and the stop block 10 abut against each other, and the protrusions 41 and the first micro switch 5 abut against each other. In the stopped state, the protrusions 40 and the stop block 10 are separated, and the protrusions 41 and the second micro switch 6 abut against each other. The housing 1 is provided with a motor slot, and the drive motor 3 is fixed on the motor slot. The output shaft of the drive motor 3 is a worm gear 30. The worm gear 30 is connected to the ratchet protection mechanism. The ratchet protection mechanism enables the automatic door lock to have a forced reset function.

[0027] Specifically, the ratchet protection mechanism includes a worm gear 7 with a recessed ratchet structure 70 inside and a small tooth 9 with multiple pawls 8 at the bottom. The small tooth 9 is pivotally connected to the worm gear 7 and coaxial. The pawls 8 are installed on the ratchet structure 70 and can cooperate with the ratchet structure 70 to form a tooth meshing transmission during the push rod 4 push-out process and a friction transmission during the push rod 4 reset process. The worm gear 7 is pivotally connected to the housing 1 and meshes with the worm 30. The small tooth 9 is connected to the gear transmission mechanism.

[0028] In this embodiment, initially, the protrusion 41 on the push rod 4 presses down on the first micro switch 5, and the control board 2 sends an on signal. The external controller detects the on signal from the control board 2 and outputs a positive current to the drive motor 3. The drive motor 3 causes the worm gear 30 to rotate in the positive direction, driving the ratchet protection mechanism to rotate, changing the rotation direction perpendicular to the bottom surface to the rotation direction parallel to the bottom surface, thus reducing speed and increasing torque. The worm gear 7 drives a small tooth 9 to rotate through friction transmission with the ratchet structure 70 and the pawl 8. The small tooth 9 drives the gear transmission mechanism to rotate at a reduced speed. The rack 42 on the push rod 4 is connected to the gear transmission mechanism, converting the circular motion of the gear transmission mechanism into linear motion. The push rod 4 is pushed out linearly under the drive of the drive motor 3, the ratchet protection mechanism, and the gear transmission mechanism. When the push rod 4 slides to the point where the protrusion 41 presses down on the second micro switch 6, the control board 2 sends an off signal. The external controller detects the off signal from the control board 2, stops supplying power to the drive motor 3, and the push rod 4 stops moving, entering a stopped state.

[0029] During the reset motion, the protrusion 41 on push rod 4 presses down on the second micro switch 6, and control board 2 sends a reset signal. The external controller detects the reset signal from control board 2 and outputs a reverse current to drive motor 3. Drive motor 3 drives worm gear 30 to rotate in the opposite direction. Worm gear 30 drives worm wheel 7 to rotate at a reduced speed. Rack 42 cooperates with gear transmission mechanism to convert the circular motion of gear transmission mechanism into linear motion. Driven by drive motor 3, ratchet protection mechanism and gear transmission mechanism, push rod 4 is pushed back linearly. When push rod 4 slides to the point where protrusion 41 presses down on the first micro switch 5, power supply to drive motor 3 stops, push rod 4 stops moving, and push rod 4 resets to its initial state.

[0030] When the power is off, when the push rod 4 is pushed back, the stop 10 on the outside of the housing 1 and the boss 40 on the push rod 4 will first contact to form a limit, indicating that the push rod 4 has been reset and unlocked, and the push rod 4 can be stopped.

[0031] Similarly, when the push rod 4 is in the reset position under power, due to control delay and signal transmission error, or if the first microswitch 5 fails, the drive motor 3 does not stop immediately. The push rod 4 continues to move inward after reaching the initial position. At this time, the contact between the push rod 4 and the housing 1 will generate a very large thrust, which will cause deformation of the rear part of the housing 1, causing the rear part of the housing 1 to bend, resulting in the push rod 4 jamming with the housing 1. Therefore, a boss 40 is designed on the push rod 4. Before the push rod 4 resets to the bottom, the boss 40 and the stop block 10 first contact each other to restrict the push rod 4 from moving further backward. The slight deformation generated by the thrust is in the front half of the housing 1, which can prevent the housing 1 from deforming and jamming.

[0032] In this embodiment, when the push rod 4 performs its pushing motion, a certain frictional force is generated between the ratchet structure 70 inside the worm gear 7 and the pawl 8. This frictional force causes the ratchet structure 70 to start rotating, and the ratchet structure 70 is connected to a pinion gear 9 via a pivot. Therefore, when the ratchet structure 70 rotates, the pinion gear 9 will also rotate synchronously. The rotation of the pinion gear 9 will further drive the entire gear transmission mechanism to rotate synchronously. In this way, the entire mechanical transmission system can smoothly complete its predetermined movement.

[0033] When push rod 4 completes its push-out motion and begins its reset motion, the ratchet structure 70 inside worm gear 7 comes into play again. At this time, ratchet structure 70 pushes pawl 8, causing pinion gear 9 to rotate synchronously again. The rotation of pinion gear 9 continues to drive the gear transmission mechanism to rotate synchronously, ensuring the smooth operation of the entire mechanical transmission system. In this way, the reciprocating motion of push rod 4 can be effectively transmitted to the gear transmission mechanism, achieving the purpose of mechanical transmission. The meshing of worm 30 with worm gear 7 increases torque and reduces speed. Simultaneously, the helical tooth structure on worm 30 prevents worm gear 7 from reversing. When push rod 4 pulls a heavy object, if the object is too heavy, this helical tooth structure can prevent the gear transmission mechanism from slipping.

[0034] Preferably, the gear transmission mechanism includes a first double gear 10 and a second double gear 11. The large gear of the first double gear 10 meshes with a small gear 9 for transmission. The small gear of the first double gear 10 meshes with the large gear of the second double gear 11. The small gear of the second double gear 11 is transmitted to the push rod 4. The first double gear 10 and the second double gear 11 are pivotally connected to the housing. In this embodiment, this meshing design effectively reduces the transmission speed. This speed reduction significantly reduces the rotational speed of the drive motor 3 transmitting to the ratchet protection mechanism and the ratchet protection mechanism transmitting to the gear transmission mechanism. This reduced rotational speed is crucial for protecting the push rod 4, because the push rod 4 needs to maintain a stable movement during the pushing and pushing-back motion. If the rotational speed is too high, it may cause instability in the movement of the push rod 4, or even damage it. Therefore, this meshing design, by reducing the rotational speed, ensures the stability of the push rod 4 during movement, thereby effectively protecting the push rod 4.

[0035] Furthermore, the control board 2 is fixed to the housing 1, and the first micro switch 5 and the second micro switch 6 are respectively fixedly connected to the control board 2. The control board 2, the first micro switch 5, and the second micro switch 6 form a module, which can be modularly produced and assembled. The control board 2 is used to receive and process signals from the first micro switch 5 and the second micro switch 6 in a timely manner to achieve precise control of the entire automatic door lock.

[0036] In this embodiment, the pawl 8 is a plastic part with elasticity. The serrated structure on its friction surface 71 is arranged along the axial direction of the turbine. The design of the serrated structure on the friction surface 71 can increase the friction between the friction surface 71 and the pawl 8. When the plastic part is heated, the elasticity will weaken, resulting in a decrease in friction. However, the friction surface 71 can ensure that it can provide sufficient basic friction even when the plastic part is heated, ensuring that the door can be pushed open.

[0037] Furthermore, the housing is provided with a sliding groove 12, and two to three first limiting blocks 120 are symmetrically arranged on the upper and lower side walls of the sliding groove 12. The front part of the push rod 4 is provided with a frustum-shaped slider 44, and the rear part of the push rod 4 is provided with a guide slider 46. The frustum-shaped slider 44 is slidably engaged with the sliding groove 12, and the guide slider 46 is slidably engaged with the sliding groove 12. The guide slider 46 and the first limiting blocks 120 cooperate with each other to limit the push rod 4 on the sliding groove 12.

[0038] In this embodiment, there are multiple first limiting blocks 120, and two sliders 44 and guide sliders 46 are symmetrically distributed on both sides of the push rod 4. The design of the first limiting block 120 can limit the movement of the push rod 4 within the sliding groove 12. When the power is off, it cooperates with the sliders 44 and guide sliders 46 on the push rod 4 respectively, and the push rod 4 performs a reset movement. The force acting on the push rod 4 is too large, which makes it difficult for the push rod 4 to slide out of the sliding groove 12, greatly increasing the deformation resistance of the automatic door lock and improving its service life.

[0039] Furthermore, it also includes a cover 12, on which a first stop 121 is provided, and a second stop 45 is provided on the push rod 4. The first stop 121 and the second stop 45 cooperate to limit the push rod 4 inside the housing 1.

[0040] In this embodiment, a first stop 121 is carefully designed at a specific position on the cover 12, which serves to provide a limiting function. Simultaneously, a second stop 45 is cleverly provided at the corresponding position on the push rod 4, which structurally and functionally complements the first stop 121. When the push rod 4 pushes out of the sliding groove 12, the first stop 121 and the second stop 45 cooperate to allow the push rod to move within a predetermined range, thereby ensuring the stable and reliable movement trajectory of the push rod 4 and avoiding mechanical failures or performance instability caused by excessive movement of the push rod 4. This design not only improves the overall structural stability but also extends the service life of the equipment.

[0041] Furthermore, the cover 12 and the housing 1 are respectively provided with corresponding latches 14 and hook grooves 120, and the cover 12 and the housing 1 are fixedly installed by the latches 14 and hook grooves 120. Similarly, the cover 12 and the housing 1 can also be fixedly installed by bolts.

[0042] 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 technical scope 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. An automatic door lock with a forced reset function, comprising a control board mounted on a housing and a drive motor, a ratchet protection mechanism, and a gear transmission mechanism connected by transmission, wherein the drive motor is electrically connected to the control board, characterized in that, It also includes a push rod, a first micro switch and a second micro switch, the first micro switch and the second micro switch being electrically connected to the control board respectively; The push rod is slidably connected to and limited by the housing, the push rod is connected to the gear transmission mechanism, the push rod is provided with a protrusion, the working end of the push rod is provided with a boss, and the outer side of the housing is provided with a stop block; In the initial state, the boss and the stop block abut against each other, and the boss and the first micro switch abut against each other; in the suspended state, the boss and the stop block separate from each other, and the boss and the second micro switch abut against each other.

2. The automatic door lock with a forced reset function according to claim 1, characterized in that, The ratchet protection mechanism includes a worm gear with a recessed ratchet structure in the middle and a small toothed wheel with a pawl at the bottom. The worm gear is pivotally connected to the housing, and the small toothed wheel is coaxially pivotally connected to the worm gear. The pawl is installed inside the ratchet structure and can cooperate with the ratchet structure to form friction transmission during the push rod extension process and tooth meshing transmission during the push rod reset process. The worm gear is connected to the worm gear on the output shaft of the drive motor, and the small toothed wheel is connected to the gear transmission mechanism.

3. The automatic door lock with a forced reset function according to claim 2, characterized in that, The friction surface of the ratchet structure is provided with a serrated structure, and the serrated teeth of the serrated structure are arranged along the axial direction of the worm gear.

4. The automatic door lock with a forced reset function according to claim 2 or 3, characterized in that, The gear transmission mechanism includes a first double gear and a second double gear. The large gear of the first double gear meshes with a small gear, and the small gear of the first double gear meshes with the large gear of the second double gear. The small gear of the second double gear is connected to the rack on the push rod. The first double gear and the second double gear are pivotally connected to the housing.

5. The automatic door lock having a forced reset function according to claim 1, wherein The control board is fixed to the housing, and the first micro switch and the second micro switch are respectively fixed to the control board.

6. The automatic door lock having a forced reset function according to claim 1, wherein The housing is provided with a sliding groove, and multiple first limiting blocks are provided on the two side walls of the sliding groove. Guide sliders are provided on both sides of the push rod. The guide sliders slide in cooperation with the sliding groove. The guide sliders and the first limiting blocks cooperate with each other to limit the push rod in the sliding groove.

7. The automatic door lock having a forced reset function according to claim 1, wherein The cover is provided with a first stop, and the push rod is provided with a second stop in the middle. The second stop and the first stop cooperate with each other to limit the push rod.

8. The automatic door lock with a forced reset function according to claim 7, characterized in that, The cover and the housing are respectively provided with corresponding latches and hook grooves, and the cover and the housing are fixedly installed by the latches and hook grooves.

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