Safe and reliable automatic lock

Abstract

The safe and reliable automatic lock comprises a lock shell, a lock cover matched with the lock shell is arranged on the lock shell, a deadbolt is arranged on the lock cover, the deadbolt movably penetrates through the lock cover, a lock tongue hole and a detection tongue hole are formed in the side wall of one end of the lock shell, and a lock tongue support and a detection tongue support are arranged in one end of the lock shell. One end of the spring bolt support is rotationally connected with a spring bolt assembly, and the spring bolt assembly telescopically moves in a spring bolt hole of the lock shell. The anti-theft lock has a back locking function under the condition that a back locking structure does not need to be arranged, has the advantages of being simple in structure, low in production cost and low in use cost, greatly improves the safety and anti-theft performance of the lock, provides safety guarantee for intelligent home furnishing, and is suitable for popularization and application. The lock with the multi-bar cylindrical lock tongue effectively solves the problems that in the current market, a lock with the multi-bar cylindrical lock tongue is complex in structure, high in production cost and difficult to meet the requirements of middle and low-level consumers, and the lock with the multi-bar cylindrical lock tongue is designed for preventing a thief from shifting the lock tongue from the inside to the outside of a door by using a sheet-shaped flexible block to easily unlock and enter the door.

Description

Technical Field

[0001] This utility model relates to the field of door locks, and in particular to a safe and reliable automatic lock. Background Technology

[0002] With the development of smart homes, home security has become a key concern. Traditional anti-theft locks pose significant security risks. Some burglars can easily unlock doors by using a flexible, flat block to slide the bolt from the inside to the outside. To address this issue, locks with multi-bar cylindrical bolts have emerged on the market, featuring a deadbolt function. However, due to their deadbolt structure, they suffer from structural complexity and high production costs, making it difficult to meet the needs of low- and middle-income consumers for cost-effective and reliable locks. Therefore, they are not well-suited for promotion in the low- and middle-end market. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a safe and reliable automatic lock.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: The safe and reliable automatic lock includes a lock shell, a matching lock cover on the lock shell, a locking knob on the lock cover, the locking knob moving through the lock cover, a latch hole and a detection latch hole on the side wall of one end of the lock shell, a latch bracket and a detection latch bracket inside one end of the lock shell, the latch bracket and the detection latch bracket are arranged side by side, a latch assembly is rotatably connected to one end of the latch bracket, the latch assembly moves in and out of the latch hole of the lock shell, a latch guide rod is integrally formed on the other end of the latch bracket, a first reset plate is provided inside the lock shell, the first reset plate is opposite to the latch bracket, the latch guide rod moves through the first reset plate, and a first spring is sleeved on the latch guide rod to drive the latch assembly to extend out of the lock shell and reset;

[0005] The detection tongue bracket is rotatably connected to one end, and the detection tongue moves in and out of the detection tongue hole in the lock shell. The other end of the detection tongue bracket is integrally formed with a detection tongue guide rod. The lock shell is also provided with a second reset plate, which is opposite to the detection tongue bracket. The detection tongue guide rod moves through the second reset plate. A second spring is sleeved on the detection tongue guide rod to drive the detection tongue to extend out of the lock shell and reset.

[0006] The lock housing also includes a first rotary transmission component, a second rotary transmission component, and a knob. The first rotary transmission component, the second rotary transmission component, and the knob are rotatably connected to the lock housing. The first rotary transmission component drives the second rotary transmission component. The knob is located in the center of the lock housing. The lock knob is connected to the knob. When the knob is rotated, the knob pushes one end of the first rotary transmission component, causing the first rotary transmission component to rotate. The other end of the first rotary transmission component releases and blocks the lock tongue bracket, causing the lock tongue assembly to retract into the lock housing to unlock.

[0007] The lock housing is also equipped with a stepper motor, which drives the first rotary transmission component at the same end. The first rotary transmission component rotates, and the other end of the first rotary transmission component releases its resistance against the lock tongue bracket. The lock tongue assembly retracts into the lock housing to unlock.

[0008] A latch shell is provided on one side of the lock case, and the latch shell is provided with an upper locking hole for accommodating the latch assembly;

[0009] The lock housing also contains a power supply and a circuit board. The power supply is connected to the circuit board, and the circuit board is connected to the stepper motor. The power supply is installed inside the lock housing through a power supply box.

[0010] By adopting the above technical solution, when the stepper motor starts and extends, or when the knob is turned counterclockwise, it can drive the first rotary transmission component to rotate clockwise. This causes the end of the first rotary transmission component near the latch bracket to rotate away from the latch bracket, thus releasing the obstruction that the latch bracket retracts into the lock housing, allowing the latch assembly to retract freely into the lock housing. When the first rotary transmission component rotates counterclockwise, the end of the first rotary transmission component near the latch bracket rotates towards the latch bracket. When the first rotary transmission component abuts against the side of the latch bracket with the latch guide rod, the latch bracket is blocked. At this time, the latch assembly cannot retract into the lock housing. This achieves a deadbolt function without the need for a deadbolt structure, giving it the advantages of simple structure, low production cost, and low operating cost. It solves the problem that current locks on the market, designed to prevent thieves from easily unlocking the door by sliding a piece of flexible metal from the inside to the outside using a multi-bar cylindrical latch, have complex structures, high production costs, and are difficult to meet the needs of low- and middle-income consumers.

[0011] Preferably, the bottom of the detection tongue support extends laterally to provide a base plate, and a lever is provided perpendicular to the base plate, with the lever and the base plate being integrally formed.

[0012] Preferably, one end of the first rotary transmission component is provided with an unlocking part, which is L-shaped. The other end of the first rotary transmission component is provided with a locking part. A drive plate is provided on one side of the locking part. The drive plate and the locking part are perpendicular to each other and integrally formed. A positioning shaft is provided vertically through the middle of the first rotary transmission component. The first rotary transmission component is rotatably connected to the lock housing through the positioning shaft. A torsion spring is sleeved on the positioning shaft. One end of the torsion spring abuts against the drive plate, and the other end of the torsion spring abuts against the first reset plate. A first limiting ring is provided above the torsion spring, which limits the torsion spring on the positioning shaft.

[0013] Specifically, the drive plate, pushed by the torsion spring, causes the first rotary transmission component to rotate, which in turn drives the locking part to rotate around the positioning axis towards the bolt bracket. The locking part abuts against the side of the bolt bracket with the bolt guide rod, thus blocking the bolt bracket and preventing the bolt assembly from retracting into the lock housing. This achieves a deadbolt function without the need for a deadbolt structure, solving the problem of traditional locks that can be easily unlocked by sliding a flexible, sheet-like block through the door gap and then sliding the bolt from the inside out. When the unlocking part is pushed by a knob or stepper motor, the first rotary transmission component rotates around the positioning axis, moving the locking part away from the bolt bracket. The side of the bolt bracket with the bolt guide rod is no longer blocked by the locking part, allowing the bolt assembly to freely retract into the lock housing for unlocking.

[0014] Preferably, one end of the second rotary transmission member is provided with a first transmission part, and the other end of the second rotary transmission member is provided with a second transmission part. A positioning post is integrally formed inside the lock housing. The positioning post passes through the middle of the second rotary transmission member. The second rotary transmission member is rotatably connected to the lock housing through the positioning post. A second limiting ring is sleeved on the positioning post.

[0015] By adopting the above technical solution, when the drive plate is pushed by the torsion spring force and the first rotary transmission component rotates around the positioning shaft, the drive plate abuts against the second transmission part and pushes the second rotary transmission component to rotate around the positioning rod, causing the first transmission part to abut against the lever; when the detection tongue bracket is subjected to the spring force of the second spring, it can drive the detection tongue to extend out of the lock shell and reset, and at the same time, the detection tongue bracket drives the lever to approach and abut against the first transmission part. Since the torque of the first transmission part pushed by the lever is greater than the torque of the second transmission part pushed by the drive plate, the locking part and the lock tongue bracket are in a separated state when the unlocking part is not pushed by the stepper motor or the knob, and the lock tongue assembly can freely retract into the lock shell to unlock.

[0016] Preferably, the knob is provided with a tension spring rod and an unlocking drive block on its circumference, and the lock housing is provided with a mounting post, with a tension spring between the tension spring rod and the mounting post opposite to it.

[0017] By adopting the above technical solution, rotating the knob drives the unlocking drive block to rotate the unlocking part and release the knob. The knob then rotates in the opposite direction to reset under the action of the tension spring rod.

[0018] Specifically, the lock housing is provided with a cover plate, the first rotary transmission component is rotatably connected to the cover plate through a positioning shaft, the second rotary transmission component is rotatably connected to the cover plate through a positioning pin, the knob is rotatably connected to the cover plate, the lock housing is provided with a first lock tongue guide groove, and the cover plate is provided with a second lock tongue guide groove and a detection tongue guide groove respectively.

[0019] Specifically, the bottom of the latch bracket is provided with a first latch guide block that matches the first latch guide groove, and the top of the latch bracket is provided with a second latch guide block that matches the second latch guide groove.

[0020] Specifically, the top of the detection tongue support is provided with a detection tongue guide block that matches the detection tongue guide groove.

[0021] Preferably, the latch assembly includes a first latch and a second latch, which are rotatably connected to a latch bracket. One end of the first latch extends laterally and is provided with a latch limiting part, which is rhomboid in shape. The two inclined surfaces of the latch limiting part are latch guide surfaces, and the two adjacent sides of the latch limiting part facing the latch bracket are latch limiting surfaces. The two latch limiting surfaces are obliquely connected. The other end of the first latch extends laterally and is provided with a latch positioning part, which is semi-circular in shape. The side of the latch positioning part opposite to the latch hole is the latch positioning surface. The latch positioning surface is perpendicular to one of the latch guide surfaces of the latch limiting part. The latch limiting part and the latch positioning part are respectively provided on two sides of the first latch.

[0022] Specifically, the structure of the second locking tongue is the same as that of the first locking tongue, and the second locking tongue is set opposite to the first locking tongue.

[0023] By adopting the above technical solution, the locking surfaces of the first and second latches abut against the side wall of the lock housing, and the first and second latches are misaligned and separated. Under the elastic force of the first spring, the latch bracket can push the first and second latches to press against the side wall of the lock housing, and the first and second latches are positioned separately on the side wall of the lock housing. When closing the door, the first latch is squeezed by the door frame and rotates towards the second latch until the first latch faces the latch limiting surface of the second latch and abuts against the front end of the latch bracket. At this time, the first and second latches come together, and the first and second latches are squeezed by the door frame and retract into the lock housing together. The first and second latches cross the door frame and enter the locking hole together. As the first and second latches compress the first spring during the process of entering the locking hole, the first spring uses its own rebound force to push the latch bracket, thereby driving the latch assembly to extend out of the latch hole of the lock housing and enter the locking hole of the latch housing, and the latch assembly achieves automatic locking. When the door is opened, the second latch is squeezed by the latch housing and rotates towards the first latch until the second latch faces the latch limiting surface of the first latch and abuts against the front end of the latch bracket. At this time, the first latch and the second latch come together. The first latch and the second latch are squeezed by the latch housing and retract into the lock housing together, and the latch assembly unlocks. After the first latch and the second latch cross the door frame together, the first spring pushes the latch bracket according to the aforementioned principle, thereby driving the latch assembly to extend out of the latch hole of the lock housing and reset.

[0024] Preferably, one end of the detection tongue extends laterally and is provided with a detection tongue limiting part, which is triangular in shape. The two inclined surfaces of the detection tongue limiting part are detection tongue guide surfaces. The other end of the detection tongue extends laterally and is provided with a detection tongue positioning part, which is arc-shaped. The two sides of the detection tongue positioning part facing the detection tongue hole are detection tongue limiting surfaces. The detection tongue positioning part and the detection tongue limiting part are respectively provided on the two sides of the detection tongue.

[0025] By adopting the above technical solution, when the door is closed, the detection tongue is squeezed by the door frame and rotates away from the lock tongue shell until the guide surface of the detection tongue contacts the detection tongue hole. At this time, the detection tongue continues to be squeezed by the door frame and gradually retracts into the detection tongue hole of the lock shell. When the door is closed and locked, the detection tongue is pressed by the opposite surface of the lock tongue shell and retracts into the detection tongue hole of the lock shell. When the door is opened, the detection tongue leaves the lock tongue shell, the second spring pushes the detection tongue bracket and drives the detection tongue to extend out of the detection tongue hole of the lock shell. The detection tongue bracket drives the lever to move the first transmission part and push the second rotary transmission component to rotate around the positioning post. This allows the second rotary part to push the drive plate to drive the first rotary transmission component to rotate around the positioning shaft. The locking part rotates away from the lock tongue bracket as the first rotary transmission component rotates, thus releasing the obstruction of the lock tongue bracket retracting into the lock hole of the lock shell, allowing the lock tongue assembly to freely retract into the lock shell.

[0026] Compared with existing technologies, the beneficial effects of this utility model are as follows:

[0027] 1. The lock housing incorporates a first rotary transmission component, a second rotary transmission component, and a knob. The structures of these components, along with the latch assembly and detection tongue, are designed and coordinated to ensure smooth operation. When the door is closed and locked, the latch assembly and detection tongue are slowly retracted into the lock housing by the pressure of the door frame. The lever retracts along with the detection tongue support, causing it to retract against the first transmission component. Simultaneously, the second transmission component retracts against the drive plate. A torsion spring pushes the drive plate, which in turn causes the locking part to rotate around the positioning axis of the latch support. During the retraction of the latch assembly, the locking part first contacts the side of the latch support without obstructing its retraction, thus achieving unobstructed locking. When the door is fully closed, the latch support, under the force of the first spring... Under its action, the bolt bracket pushes the bolt assembly out of the lock case and resets. At this time, the locking part and the bolt bracket are misaligned, and the locking part and the side of the bolt bracket with the bolt guide rod abut against each other to limit the bolt assembly from retracting into the lock case. This achieves automatic locking without the need for a deadbolt structure, with a high security and anti-theft index, providing security for smart homes. It is conducive to promotion and use in the low-to-mid-end market and has the advantages of simple structure, low production cost, and low operating cost. It effectively solves the problem that locks with multi-bar cylindrical bolts designed to prevent thieves from easily unlocking the door by sliding a piece of flexible bolt from the inside to the outside are complex in structure, have high production cost, and are difficult to meet the needs of low-to-mid-end consumers.

[0028] 2. It employs a stepper motor in conjunction with a first rotary transmission component. When the output end of the stepper motor extends and pushes the unlocking part to rotate clockwise, the locking part simultaneously rotates clockwise around the positioning shaft, moving away from the bolt bracket to release the bolt assembly's obstructed extension and retraction within the lock housing. This allows the bolt assembly to freely retract into the lock housing for unlocking, achieving intelligent unlocking. When the knob is turned to drive the unlocking drive block to rotate the unlocking part clockwise, the first rotary transmission component rotates clockwise around the positioning shaft, and the locking part rotates away from the bolt bracket to release the bolt assembly's obstructed extension and retraction within the lock housing. This allows the bolt assembly to freely retract into the lock housing for unlocking. It not only enables unlocking via a key from the outside and manual turning of the knob from the inside, but also intelligent unlocking via a stepper motor. This provides multiple unlocking methods without the need for a deadbolt mechanism, greatly improving ease of use and achieving strong versatility. Attached Figure Description

[0029] For ease of explanation, the present invention will be described in detail below with reference to the preferred embodiments and accompanying drawings.

[0030] Figure 1 This is a perspective view of a safe and reliable automatic lock and its latch shell according to the present invention.

[0031] Figure 2 This is a perspective view of a safe and reliable automatic lock according to this utility model, showing the removal of the lock cover and lock knob.

[0032] Figure 3 This is a three-dimensional view of the internal structure of a safe and reliable automatic lock according to this utility model.

[0033] Figure 4 This is a perspective view of the internal structure of a safe and reliable automatic lock according to this utility model from another perspective.

[0034] Figure 5 This is a perspective view of the internal structure of a safe and reliable automatic lock drive latch assembly and detection latch switch lock according to the present invention.

[0035] Figure 6 This is a perspective view of the transmission structure of a safe and reliable automatic lock drive latch assembly and detection latch switch lock according to the present invention.

[0036] Figure 7 This is a perspective view of the latch shell of a safe and reliable automatic lock according to this utility model.

[0037] Figure 8 This is a three-dimensional view of the assembly of the detection tongue and detection tongue support of a safe and reliable automatic lock according to this utility model.

[0038] Figure 9 This utility model provides a safe and reliable automatic lock. Figure 6 3D diagrams of transmission structures in different directions.

[0039] Figure 10 This is a front view of the latch assembly of a safe and reliable automatic lock according to this utility model.

[0040] Figure 11 This is a perspective view of the latch assembly of a safe and reliable automatic lock according to the present invention.

[0041] Figure 12 This is a perspective view of the first or second latch of a safe and reliable automatic lock according to the present invention.

[0042] Figure 13 This utility model provides a safe and reliable automatic lock. Figure 12 Three-dimensional diagrams from different angles.

[0043] Figure 14 This is a perspective view of the detection tongue of a safe and reliable automatic lock according to this utility model.

[0044] Figure 15 This utility model provides a safe and reliable automatic lock. Figure 14 Three-dimensional diagrams from different angles. Detailed Implementation

[0045] To facilitate understanding of this utility model, a more complete description will be given below with reference to the accompanying drawings. The drawings illustrate preferred embodiments of this utility model. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of this utility model.

[0046] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0047] Reference Figures 1 to 6 As shown, this utility model discloses a safe and reliable automatic lock, including a lock housing 1, a lock cover 2, a locking knob 3, a bolt hole 4, a detection bolt hole 5, a bolt support 6, a detection bolt support 7, a bolt assembly 8, a bolt guide rod 9, a first reset plate 10, and a first spring 11. The lock cover 2 is mounted on the lock housing 1 and matches it. The locking knob 3 is mounted on the lock cover 2 and movably passes through the lock cover 2. The bolt hole 4 and the detection bolt hole 5 are respectively located on the side wall of one end of the lock housing 1. The bolt support 6 and the detection bolt support 7 are respectively located on the side wall of the lock housing 1. The latch bracket 6 and the detection latch bracket 7 are arranged side by side at one end. One end of the latch bracket 6 is rotatably connected to the latch assembly 8. The latch assembly 8 moves in and out of the latch hole 4 of the lock housing 1. The latch guide rod 9 is integrally formed with the other end of the latch bracket 6. The first reset plate 10 is located inside the lock housing 1 and is opposite to the latch bracket 6. The latch guide rod 9 moves through the first reset plate 10. The first spring 11 is sleeved on the latch guide rod 9 and is used to drive the latch assembly 8 to extend out of the lock housing 1 and reset.

[0048] The detection tongue support 7 is rotatably connected to one end of the detection tongue 12. The detection tongue 12 moves in and out of the detection tongue hole 5 of the lock shell 1. The other end of the detection tongue support 7 is integrally formed with a detection tongue guide rod 13. The lock shell 1 is provided with a second reset plate 14, which is opposite to the detection tongue support 7. The detection tongue guide rod 13 moves through the second reset plate 14. A second spring 15 is sleeved on the detection tongue guide rod 13 to drive the detection tongue 12 to extend out of the lock shell 1 and reset.

[0049] The lock housing 1 is provided with a first rotary transmission component 16, a second rotary transmission component 17, and a knob 18. The first rotary transmission component 16, the second rotary transmission component 17, and the knob 18 are rotatably connected to the lock housing 1. The first rotary transmission component 16 drives the second rotary transmission component 17. The knob 18 is located at the center of the lock housing 1. One end of the knob 18 is connected and installed to the lock knob 3. The other end of the knob 18 is provided with a keyhole for inserting a key. When the knob 18 is rotated, the knob 18 pushes one end of the first rotary transmission component 16 to rotate clockwise. The clockwise rotation of the first rotary transmission component 16 drives its other end to rotate and release the bolt support 6. The bolt assembly 8 retracts into the lock housing 1 to unlock.

[0050] A stepper motor 19 is installed inside the lock housing 1. The stepper motor 19 is installed inside the lock housing 1 through a motor fixing component 191. The stepper motor 19 pushes one end of the first rotary transmission component 16 to rotate clockwise. The clockwise rotation of the first rotary transmission component 16 drives the other end of it to rotate, thereby releasing the block against the lock tongue bracket 6. The lock tongue assembly 8 retracts into the lock housing 1 to unlock.

[0051] Reference Figure 7 As shown, a latch shell 20 is provided on one end side of the lock case 1, and the latch shell 20 is provided with an upper locking hole 21 for accommodating the latch assembly 8.

[0052] Reference Figures 3 to 5 As shown, a power supply 22 and a circuit board 23 are respectively provided inside the lock housing 1. The power supply 22 is energized and connected to the circuit board 23, and the circuit board 23 is energized and connected to the stepper motor 19. The power supply 22 is installed inside the lock housing 1 through a power supply base box 24, which is installed inside the lock housing 1 through base box positioning posts 241. In this embodiment, two base box positioning posts 241 are provided. In other embodiments, different numbers of base box positioning posts 241 can be provided according to actual conditions, so it is not limited to this.

[0053] Reference Figure 8 As shown, the bottom of the detection tongue support 7 extends laterally with a base plate 71, and a lever 72 is provided perpendicular to the base plate 71. The lever 72 and the base plate 71 are integrally formed.

[0054] Reference Figure 9As shown, the first rotary transmission member 16 has an unlocking part 161 at one end, which is L-shaped. The other end of the first rotary transmission member 16 has a locking part 162. A drive plate 163 is provided on one side of the locking part 162. The drive plate 163 and the locking part 162 are perpendicular to each other and integrally formed. A positioning shaft 164 is provided vertically through the middle of the first rotary transmission member 16. The first rotary transmission member 16 can rotate around the positioning shaft 164. The first rotary transmission member 16 is rotatably connected to the lock housing 1 through the positioning shaft 164. A torsion spring 165 is sleeved on the positioning shaft 164. One end of the torsion spring 165 abuts against the drive plate 163, and the other end of the torsion spring 165 abuts against the first reset plate 10. A first limiting ring 166 is provided above the torsion spring 165. The first limiting ring 166 restricts the torsion spring. Spring 165 limits the position on positioning shaft 164. The above structural design allows the torsion spring 165 to push the drive plate 163, which in turn drives the first rotary transmission component 16 to rotate, thereby driving the locking part 162 to rotate around positioning shaft 164 toward the lock tongue bracket 6. When the locking part 162 abuts against the side of the lock tongue bracket 6 with the lock tongue guide rod 9, the lock tongue bracket 6 is blocked, and the lock tongue assembly 8 cannot retract into the lock shell 1, thus realizing the automatic anti-locking function, which does not require an anti-locking structure. When the unlocking part 161 is pushed by knob 18 or stepper motor 19, it can drive the first rotary transmission component 16 to rotate around positioning shaft 164, causing the locking part 162 to rotate away from the lock tongue bracket 6. The side of the lock tongue bracket 6 with the lock tongue guide rod 9 is not blocked by the locking part 162, allowing the lock tongue assembly 8 to freely retract into the lock shell 1 for unlocking.

[0055] Reference Figure 9 As shown, one end of the second rotary transmission member 17 is provided with a first transmission part 171, and the other end of the second rotary transmission member 17 is provided with a second transmission part 172. A positioning post 173 is integrally formed inside the lock housing 1. The positioning post 173 passes through the middle of the second rotary transmission member 17. The second rotary transmission member 17 is rotatably connected to the lock housing 1 through the positioning post 173. A second limiting ring 174 is sleeved on the positioning post 173.

[0056] Reference Figure 9 As shown, the knob 18 is provided with a tension spring rod 181 and an unlocking drive block 182 on its circumference. The lock housing 1 is provided with a mounting post 180. A tension spring 183 is provided between the tension spring rod 181 and the mounting post 180. The tension spring 183 is used to pull the knob 18 to rotate in the opposite direction to reset it after rotation.

[0057] Reference Figure 2 , Figure 4 and Figure 6As shown, the lock housing 1 is also provided with a cover plate 25. The first rotary transmission component 16 is rotatably connected to the cover plate 25 through the positioning shaft 164. The second rotary transmission component 17 is rotatably connected to the cover plate 25 through the positioning pin 173. The knob 18 is rotatably connected to the cover plate 25. The lock housing 1 is provided with a first lock tongue guide groove 26. The cover plate 25 is provided with a second lock tongue guide groove 27 and a detection tongue guide groove 28 respectively. The circuit board 23 is provided on the cover plate 25.

[0058] Reference Figure 2 and Figure 4 As shown, the lock housing 1 has a first knob mounting hole 31 in the center, and the cover plate 25 has a second knob mounting hole 32. One end of the knob 18 is connected to the lock housing 1 through the first knob mounting hole 31, and the other end of the knob 18 is connected to the cover plate 25 through the second knob mounting hole 32.

[0059] Specifically, the cover plate 25 is installed inside the lock housing 1 by one or more cover plate positioning posts 251. In this embodiment, four cover plate positioning posts 251 are provided. In other embodiments, different numbers of cover plate positioning posts 251 can be provided according to the actual situation, so it is not limited to this.

[0060] Reference Figure 8 As shown, the top of the detection tongue support 7 is provided with a detection tongue guide block 70 that matches the detection tongue guide groove 28.

[0061] Reference Figure 10 and Figure 11 As shown, the bottom of the latch bracket 6 is provided with a first latch guide block 29 that matches the first latch guide groove 26, and the top of the latch bracket 6 is provided with a second latch guide block 30 that matches the second latch guide groove 27.

[0062] Reference Figures 10 to 13As shown, the latch assembly 8 includes a first latch 81 and a second latch 82, which are rotatably connected to the latch bracket 6. One end of the first latch 81 extends laterally to form a latch limiting portion 83, which is rhomboid in shape. The two inclined surfaces of the latch limiting portion 83 are latch guide surfaces 84, and the two adjacent sides of the latch limiting portion 83 facing the latch bracket 6 are latch limiting surfaces 85, which are obliquely joined. The other end of the first latch 81 extends laterally to form a latch positioning portion 86. The latch positioning part 86 is semi-circular, and the side of the latch positioning part 86 opposite to the latch hole 4 is the latch positioning surface 87. The latch positioning surface 87 is perpendicular to one of the latch guide surfaces 84 of the latch limiting part 83. The latch limiting part 83 and the latch positioning part 86 are respectively provided on two sides of the first latch 81. The structure of the second latch 82 is the same as that of the first latch 81. The second latch 82 is arranged opposite to the first latch 81. The above structural design allows the first latch 81 to rotate towards the second latch 82 under the pressure of the door frame when the door is closed. The latch limiting surface 85 of the first latch 81 facing the second latch 82 abuts against the front end of the latch bracket 6. At this time, the first latch 81 and the second latch 82 are brought together. The first latch 81 and the second latch 82 are squeezed by the door frame and retract into the lock housing 1. The first latch 81 and the second latch 82 cross the door frame and enter the upper lock hole 21. The first spring 11 pushes the latch bracket 6, thereby driving the latch assembly 8 to extend out of the latch hole 4 of the lock housing 1 and enter the upper lock hole 21 of the latch housing 20. When the door is opened, the second latch 82 is squeezed by the latch housing 1 towards the first latch 81. When the direction is rotated until the second latch 82 abuts against the latch limiting surface 85 of the first latch 81 and the front end of the latch bracket 6, the first latch 81 and the second latch 82 come together. The first latch 81 and the second latch 82 are squeezed by the latch shell 20 and retract into the lock shell 1. After the first latch 81 and the second latch 82 cross the door frame together, the first spring 11 pushes the latch bracket 6 and drives the latch assembly 8 to extend out of the latch hole 4 of the lock shell 1 and reset. This realizes the function of anti-locking and allows the latch assembly 8 to retract freely into the lock shell 1 for unlocking.

[0063] Reference Figure 14 and Figure 15 As shown, a detection tongue 12 extends laterally from one end and is provided with a detection tongue limiting part 121. The detection tongue limiting part 121 is triangular in shape, and the two inclined surfaces of the detection tongue limiting part 121 are detection tongue guide surfaces 122. A detection tongue positioning part 123 extends laterally from the other end of the detection tongue 12. The detection tongue positioning part 123 is arc-shaped, and the two sides of the detection tongue positioning part 123 facing the detection tongue hole 5 are detection tongue limiting surfaces 124. The detection tongue positioning part 123 and the detection tongue limiting part 121 are respectively provided on the two sides of the detection tongue 12.

[0064] Reference Figures 1 to 15As shown, the working process of this safe and reliable automatic lock is as follows: When the door needs to be closed and locked, the latch assembly 8 and the detection tongue 12 are pressed into the lock housing 1 by the door frame. The lever 72 retracts from the first transmission part 171 as the detection tongue bracket 7 retracts into the lock housing 1, while the second transmission part 172 retracts from the drive plate 163. This causes the torsion spring 165 to push the drive plate 163, thereby driving the locking part 162 to rotate around the positioning shaft 164 towards the latch bracket 6. During the retraction of the latch assembly 8 into the lock housing 1, the locking part 162 first contacts the side of the latch bracket 6 but does not prevent the latch bracket 6 from retracting into the lock housing 1. When the door is fully closed, the detection tongue 12 is pressed against the opposite surface of the latch housing 20, and the detection tongue 12 will not extend out of the lock housing 1 to reset. The lever 72 will not push the first transmission part 171. This prevents the second transmission part 172 from pressing against the drive plate 163. The drive plate 163 on the locking part 162 is pushed by the torsion spring 165, causing the locking part 162 to continue to press against the side of the latch bracket 6. When the door is fully closed, the latch bracket 6 drives the latch assembly 8 to extend out of the lock case 1 and reset under the action of the first spring 11. At this time, the locking part 162 and the latch bracket 6 are misaligned. The locking part 162 and the side of the latch bracket 6 with the latch guide rod 9 abut against each other to limit the latch assembly 8 from retracting into the lock case 1. This achieves the locking of the latch assembly 8, giving it an automatic anti-locking function to prevent thieves from easily unlocking the door by using a piece of flexible sheet to slide the latch from the inside to the outside. This provides a safer guarantee for smart homes and has a higher anti-theft security index.

[0065] When the latch assembly 8 needs to be unlocked, there are three ways to unlock it. The first is to turn the lock knob 3 from inside the door to drive the knob 18 to rotate. The second is to insert the key into the keyhole from outside the door and turn it to drive the knob 18 to rotate. The third is to unlock the latch assembly 8 by using the stepper motor 19. When the user turns the knob 18 using the first and second methods, the rotating knob 18 pushes the unlocking part 161 to rotate clockwise through the unlocking drive block 182, causing the first rotary transmission member 16 to rotate around the positioning shaft 164. The locking part 162 rotates away from the latch bracket 6, releasing the contact with the side of the latch bracket 6 where the latch guide rod 9 is located. At this time, the latch assembly 8 can freely retract into the lock case 1 to unlock, realizing that the locking state of the latch assembly 8 can be released by turning the knob 18. When the knob 18 is released or stopped, the tension spring 183 pulls the tension spring rod 181, which in turn drives the knob 18 to rotate and reset, thereby releasing the pressure of the unlocking drive block 182 on the unlocking part 161. Under the force of the torsion spring 165, the drive plate 163 pushes the locking part 162 to rotate around the positioning shaft 164, so that the drive plate 163 returns to contact with the second transmission part 172, and the first rotary transmission component 16 returns to the initial unlocked state of the lock tongue assembly 8.

[0066] When the stepper motor 19 is used to release the locking state of the latch assembly 8, the stepper motor 19 starts, and the output end of the stepper motor 19 extends to push the unlocking part 161 to rotate clockwise, causing the locking part 162 to rotate around the positioning shaft 164 and move away from the latch bracket 6. At this time, the latch assembly 8 can freely retract into the lock housing 1 to unlock. When the output end of the stepper motor 19 retracts, it releases the push on the unlocking part 161. The torsion spring 165 uses its elastic force to push the drive plate 163 to drive the locking part 162 and the drive plate 163 to rotate around the positioning shaft 164 toward the latch bracket 6, so that the drive plate 163 returns to contact with the second transmission part 172. The first rotary transmission member 16 returns to the initial unlocked state of the latch assembly 8, which realizes intelligent unlocking using the stepper motor 19.

[0067] Its overall structure, through the cooperation of the first rotary transmission component 16, the second rotary transmission component 17, and the knob 18 with the bolt assembly 8 and the detection tongue 12, enables unobstructed locking when the door is locked and, when the door is fully closed, the locking part 162 abuts against the side of the bolt bracket 6 with the bolt guide rod 9 to limit the retraction of the bolt assembly 8 into the lock case 1. This allows it to have a deadbolt function without the need for a deadbolt structure and provides multiple unlocking methods to meet the user's unlocking requirements. It simplifies the structure of locks with deadbolt functions currently on the market and reduces the cost of current locks. The production cost of locks with deadbolt function on the market is low. Not only do they have the advantages of simple structure, low production cost and low usage cost, but they also greatly improve the security and anti-theft performance of locks, providing a more secure guarantee for smart homes. This meets the needs of low- and middle-income consumers for high-performance, safe and reliable locks. It effectively solves the problems of current locks with multi-bar cylindrical bolts designed to prevent thieves from easily unlocking the door by sliding a flexible plate from the inside to the outside. These locks are complex in structure, have high production costs, and are difficult to meet the needs of low- and middle-income consumers.

[0068] The above embodiments are merely examples of this utility model and are not intended to limit the implementation and scope of this utility model. All technical solutions that are the same as or equivalent to the contents described in the claims of this utility model should be included within the protection scope of this utility model.

Claims

1. A safe and reliable automatic lock, comprising a lock housing, a matching lock cover on the lock housing, a locking knob on the lock cover, the locking knob moving through the lock cover, and a latch hole and a detection latch hole respectively provided on the side wall of one end of the lock housing, characterized in that: The lock housing has a latch support and a detection latch support inside one end. The latch support and the detection latch support are arranged side by side. A latch assembly is rotatably connected to one end of the latch support. The latch assembly moves in and out of the latch hole of the lock housing. A latch guide rod is integrally formed at the other end of the latch support. A first reset plate is provided inside the lock housing. The first reset plate is opposite to the latch support. The latch guide rod moves through the first reset plate. A first spring is sleeved on the latch guide rod to drive the latch assembly to extend out of the lock housing and reset. The detection tongue bracket is rotatably connected to one end, and the detection tongue moves in and out of the detection tongue hole in the lock shell. The other end of the detection tongue bracket is integrally formed with a detection tongue guide rod. The lock shell is provided with a second reset plate, which is opposite to the detection tongue bracket. The detection tongue guide rod moves through the second reset plate. A second spring is sleeved on the detection tongue guide rod to drive the detection tongue to extend out of the lock shell and reset. The lock housing contains a first rotary transmission component, a second rotary transmission component, and a knob. The first rotary transmission component, the second rotary transmission component, and the knob are rotatably connected to the lock housing. The first rotary transmission component drives the second rotary transmission component. The knob is located at the center of the lock housing. The lock knob is connected to the knob. When the knob is rotated, the knob pushes one end of the first rotary transmission component, causing the first rotary transmission component to rotate. The other end of the first rotary transmission component releases and blocks the lock tongue bracket, causing the lock tongue assembly to retract into the lock housing to unlock. The lock housing is equipped with a stepper motor, which drives the first rotary transmission component at the same end. The first rotary transmission component rotates, and the other end of the first rotary transmission component releases its resistance against the lock tongue bracket. The lock tongue assembly retracts into the lock housing to unlock. A latch shell is provided on one side of the lock case, and the latch shell is provided with an upper locking hole for accommodating the latch assembly; The lock housing contains a power supply and a circuit board. The power supply is connected to the circuit board, and the circuit board is connected to the stepper motor. The power supply is installed inside the lock housing through a power supply box.

2. The safe and reliable automatic lock according to claim 1, characterized in that: The bottom of the detection tongue support extends laterally to form a base plate, and a lever is provided perpendicular to the base plate. The lever and the base plate are integrally formed.

3. The safe and reliable automatic lock according to claim 1, characterized in that: The first rotary transmission component has an unlocking part at one end, which is L-shaped. The other end of the first rotary transmission component has a locking part. A drive plate is provided on one side of the locking part. The drive plate and the locking part are perpendicular to each other and integrally formed. A positioning shaft is provided vertically through the middle of the first rotary transmission component. The first rotary transmission component is rotatably connected to the lock housing through the positioning shaft. A torsion spring is sleeved on the positioning shaft. One end of the torsion spring abuts against the drive plate, and the other end of the torsion spring abuts against the first reset plate. A first limiting ring is provided above the torsion spring. The first limiting ring limits the torsion spring on the positioning shaft.

4. A safe and reliable automatic lock according to claim 1, characterized in that: One end of the second rotary transmission component is provided with a first transmission part, and the other end of the second rotary transmission component is provided with a second transmission part. A positioning post is integrally formed inside the lock housing. The positioning post passes through the middle of the second rotary transmission component. The second rotary transmission component is rotatably connected to the lock housing through the positioning post. A second limiting ring is sleeved on the positioning post.

5. A safe and reliable automatic lock according to claim 1, characterized in that: The knob is provided with a tension spring rod and an unlocking drive block on its circumference. The lock housing is provided with a mounting post, and a tension spring is provided between the tension spring rod and the mounting post opposite it.

6. A safe and reliable automatic lock according to claim 3 or 4, characterized in that: The lock housing is provided with a cover plate. The first rotary transmission component is rotatably connected to the cover plate through a positioning shaft. The second rotary transmission component is rotatably connected to the cover plate through a positioning pin. The knob is rotatably connected to the cover plate. The lock housing is provided with a first lock tongue guide groove. The cover plate is provided with a second lock tongue guide groove and a detection tongue guide groove. The circuit board is located on the cover plate.

7. A safe and reliable automatic lock according to claim 6, characterized in that: The bottom of the latch bracket is provided with a first latch guide block that matches the first latch guide groove, and the top of the latch bracket is provided with a second latch guide block that matches the second latch guide groove.

8. A safe and reliable automatic lock according to claim 6, characterized in that: The top of the detection tongue support is provided with a detection tongue guide block that matches the detection tongue guide groove.

9. A safe and reliable automatic lock according to claim 1, characterized in that: The latch assembly includes a first latch and a second latch, which are rotatably connected to a latch bracket. One end of the first latch extends laterally and is provided with a latch limiting part, which is rhomboid in shape. The two inclined surfaces of the latch limiting part are latch guide surfaces, and the two adjacent sides of the latch limiting part facing the latch bracket are latch limiting surfaces. The two latch limiting surfaces are obliquely connected. The other end of the first latch extends laterally and is provided with a latch positioning part, which is semi-circular in shape. The side of the latch positioning part opposite to the latch hole is the latch positioning surface. The latch positioning surface is perpendicular to one of the latch guide surfaces of the latch limiting part. The latch limiting part and the latch positioning part are respectively provided on two sides of the first latch. The structure of the second latch is the same as that of the first latch, and the second latch is positioned opposite to the first latch.

10. A safe and reliable automatic lock according to claim 1, characterized in that: The detection tongue extends laterally from one end and is provided with a detection tongue limiting part. The detection tongue limiting part is triangular in shape, and the two inclined surfaces of the detection tongue limiting part are detection tongue guide surfaces. The detection tongue extends laterally from the other end and is provided with a detection tongue positioning part. The detection tongue positioning part is arc-shaped, and the two sides of the detection tongue positioning part facing the detection tongue hole are detection tongue limiting surfaces. The detection tongue positioning part and the detection tongue limiting part are respectively provided on the two sides of the detection tongue.

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