Method and principle of a hidden key mechanical combination lock

Abstract

The present application relates to a kind of principle and method of hidden key mechanical combination lock, the lock adopts the unlocking mode of pressing key code, but the core pin controlling unlocking is all hidden in the lock, only by a exposed button to press, avoid the hidden danger of leaving fingerprints on the key, so that anyone cannot crack the code. The lock is purely mechanical, solid and durable, will not program disorder, stable and reliable performance, and no electricity, not afraid of magnetic field, suitable for various environments, but also can be attached with alarm function, completely meet the consumer demand of both safe, more convenient, also need to be rich in function.

Description

Technical fields:

[0001] This invention relates to a mechanical combination lock. Background Technology

[0002] Locks are essential items in every household. Mechanical locks are inexpensive and durable; advanced B-class and C-class locks offer strong anti-theft capabilities. However, the inconvenience of carrying keys often deters consumers. Electronic smart locks are favored by consumers for their trendy appearance and ease of use, but as electronic products, they suffer from inherent flaws such as short component lifespan, susceptibility to magnetic fields, frequent crashes and malfunctions, and questionable anti-theft capabilities. These flaws do not exist in mechanical combination locks. However, existing mechanical combination locks on the market also have shortcomings: firstly, push-button locks, while convenient, leave fingerprints on the buttons after pressing the combination, easily revealing the password and posing a significant security risk; secondly, rotary combination locks require rotating multiple dials one by one, which is time-consuming, laborious, and inconvenient, and the small size of the dials makes them unsuitable for the elderly and children. Addressing the advantages and disadvantages of various existing mechanical locks, I have invented a new lock that integrates the advantages of all types of locks: the hidden-key mechanical combination lock.

[0003] Technical solution

[0004] This concealed key mechanical combination lock consists of a lock body, handle, bolt, and lock cylinder. The lock body houses the handle, bolt, and lock cylinder, fixing them to the door panel or door leaf. The handle, with inner and outer versions, connects to the bolt and lock cylinder, controlling the extension and retraction of the bolt to open and close the door. The bolt, controlled by the handle, inserts into the door frame to lock the door panel or door leaf. The lock cylinder, composed of a cylinder body, button, isolating plate, limit plate, control plate, and core pin, controls whether the handle can be turned, thus controlling whether the lock can be opened.

[0005] This lock is very easy to use. Simply rotate the single button to your chosen combination, press it, and then pull the outer handle down to open the door. If you enter the wrong combination, simply lift the outer handle upwards; all the internal pins will immediately reset, allowing you to try again.

[0006] This lock is extremely safe and reliable: First, all components have undergone mechanical calculations, making them sturdy and durable; second, it has a large number of control pins, and the password can be freely set to any number of digits within this range, making it impossible for others to crack; third, all pins are hidden inside the lock, neither by touch nor by sight, making it impossible for anyone to crack the password; fourth, all pins are activated by a single button exposed on the outside of the lock, and pressing any pin will only leave a fingerprint on this single exposed button, thus fundamentally eliminating the possibility of others cracking the password by pressing the button and leaving fingerprints. The lock features several safety features, including: 1) a novel technology and method that no other combination lock possesses; 2) the sound and feel of all the pins being pressed are identical, so that even amplifying the sound with a stethoscope would not reveal any difference, making it impossible for anyone to crack the combination; 3) the design of the inner handle to automatically separate from the bolt in normal operation, preventing thieves from opening the door from the inside by inserting a hook through the peephole; 4) the ability for thieves to open the door from the inside by hooking or pressing the inner handle through the peephole.

[0007] This lock also has a reserved interface for electronic components, allowing the integration of smart lock functions such as stranger detection alarm, multiple-press alarm, and remote monitoring. These electronic functions can be controlled unidirectionally, but will not affect the lock's independent locking and unlocking functions due to power failure or program malfunction. Therefore, this lock allows users to enjoy the services of smart products while ensuring door security. Attached Figure Description

[0008] 1. Figure 1 This is an image of a hidden key mechanical combination lock.

[0009] 2. Figure 2 This is a diagram showing the construction of the inner and outer handles;

[0010] 3. Figure 3 This is a diagram of the control panel structure;

[0011] 4. Figure 4 This is a diagram of the isolation pusher structure;

[0012] 5. Figure 5 This is a diagram of the reset pusher structure;

[0013] 6. Figure 6 This is a diagram of the resetting hook structure;

[0014] 7. Figure 7 This is a diagram of the unlocking pusher mechanism;

[0015] 8. Figure 8 This is a structural diagram of the handle assembly;

[0016] 9. Figure 9 This is a diagram of the large latch structure;

[0017] 10. Figure 10 This is a diagram of the anti-push block structure;

[0018] 11. Figure 11 This is a schematic diagram of the forced limiting mechanism of the large latch;

[0019] 12. Figure 12 This is a schematic diagram of the mechanism for releasing the forced limit;

[0020] 13. Figure 13 This is a diagram of the small latch structure;

[0021] 14. Figure 14 This is a structural diagram of the connector;

[0022] 15. Figure 15 This is a diagram showing the normal state of the latch;

[0023] 16. Figure 16 This is a diagram showing the locked state of the large latch;

[0024] 17. Figure 17 This is a structural diagram of the lock cylinder;

[0025] 18. Figure 18 This is a diagram of the core pin structure;

[0026] 19. Figure 19 This is a structural diagram of the modulation component;

[0027] 20. Figure 20 This is a plan view of the isolation panel;

[0028] twenty one, Figure 21 This is a control panel layout diagram;

[0029] twenty two, Figure 22 This is a plan view of the limit plate;

[0030] twenty three, Figure 23 This is a schematic diagram of a limit spring;

[0031] twenty four, Figure 24 This is a plan view of the rear cover.

[0032] 25. Figure 25 This is a diagram of the button rotary dial;

[0033] 26. Figure 26 This is a schematic diagram of the lock cylinder structure;

[0034] 27. Figure 27 This is a diagram illustrating how the "control panel" controls the phone.

[0035] 28. Figure 28 A schematic diagram showing the status of the non-password pins;

[0036] 29. Figure 29 This is a schematic diagram showing the status of the password pins;

[0037] 30. Figure 30 This is a schematic diagram of the core pin cross block orientation adjustment method;

[0038] 31. Figure 31 This is a schematic diagram of the limit spring before it is in operation;

[0039] 32. Figure 32 This is a schematic diagram showing the state of the limit spring after it has been activated.

[0040] 33. Figure 33 This is a schematic diagram of the reset disk in the unrotated state;

[0041] 34. Figure 34 This is a schematic diagram showing the state of the reset disk after it has rotated.

[0042] 35. Figure 35 This is a schematic diagram showing the control panel and the core pin not touching.

[0043] 36. Figure 36 This is a diagram showing the state where the control panel and the core pin have touched.

[0044] 37. Figure 37 This is a diagram illustrating the normal state of the isolation panel;

[0045] 38. Figure 38 This is a structural diagram of the U-shaped component;

[0046] 39. Figure 39 This is a schematic diagram of the function of the U-shaped component;

[0047] 40. Figure 40 This is a diagram of the inner lever construction;

[0048] 41. Figure 41 This is a diagram of the internal handle construction;

[0049] 42. Figure 42 This is a structural diagram of the connecting pin assembly;

[0050] 43. Figure 43 This is a schematic diagram of the connection mechanism between the inner handle and the inner lever.

[0051] 44. Figure 44 This is a structural diagram of the large latch safety component.

[0052] Label Explanation

[0053] 1. Concealed key mechanical combination lock; 2. External handle; 2-1. Internal handle; 2-2. Internal lever; 2-3. External lever; 2-4. Steel pin; 2-5. Positioning rod; 2-6. Connecting shaft; 3. Control panel; 3-1. Reset groove; 3-2. Right external groove; 3-3. Right middle groove; 3-4. Right internal groove; 4. Isolation push plate; 5. Reset push plate; 6. Reset hook plate; 7. Unlocking push plate; 9. Large bolt; 9-1. Safety port; 9-2. Lever groove; 9-3. Anti-push port; 10. Anti-push block; 13. Small bolt; 13-1. Buffer groove; 14. Connector; 14-1. Slide groove; 14-2. Buffer block; 15. Small spring; 15-1. Large spring; 17. Lock cylinder; 17-1. Control groove; 17-2. Limit groove; 17-3. Core pin hole; 17-4. Steel shaft hole; 18. Core pin; 18-1. Limit groove; 18-2. Upper strip block; 18- 3. Lower strip block; 18-4. Slot; 19. Adjusting component; 19-1. Limiting foot; 19-2. Strip opening; 19-3. Limiting head; 20. Isolation disc; 20-1. Push plate opening; 20-2. Button hole; 21. Control disc; 21-1. Push plate opening; 21-2. Strip groove; 21-3. Circular groove; 22. Limiting disc; 22-1. Push plate opening; 22-2. Arc groove; 22-3. Spring groove; 22-4. Hook plate opening; 23. Limiting spring; 24. Rear cover plate; 24-1. Adjusting port; 25. Turntable; 25-1. Button; 38. U-shaped component; 38-1. Lifting groove; 38-2. Spring groove; 40. Connecting hole; 41. Button groove; 41-1. Steel pin hole; 42. Rotary knob; 42-1. Bayonet; 42-2. Bayonet head; 42-3. Push-pull knob; 42-4. Connecting pin; 44. Safety button; 44-1. Safety block. Detailed Implementation

[0054] The specific implementation method of this hidden key mechanical combination lock is described below with reference to the illustrations:

[0055] Figure 1 This is the appearance of the lock. Figure 1 The lock has a ring of numbers at the bottom, each number containing a button, or core pin, but these buttons are hidden by the outer dial 25. They cannot be seen or touched; the exposed button 25-1 must be rotated to the combination position before pressing it. After entering the combination, pulling the outer handle 2 downwards simultaneously pulls the large latch 9 and small latch 13 back into place, opening the door. In other words, to open the door, the large latch 9 and small latch 13 must be pulled back into the lock, controlled by the outer handle 2. However, whether the outer handle 2 can be pulled downwards is controlled by the buttons hidden within the lock. Which button should be pressed and which should not be pressed must be precise; pressing one more or less will prevent the outer handle 2 from being pulled downwards, and the lock will not open. Furthermore, no one can see which buttons are the combination and which have been pressed; pressing them only leaves fingerprints on button 25-1, making it impossible for anyone to decipher the combination.

[0056] The handle is as follows Figure 2 As shown, it consists of an outer handle 2 and an inner handle 2-1, connected by a steel pin 2-4. Each handle has an outer lever 2-3 and an inner lever 2-2, both of which can be swung left and right to control the extension and retraction of the large latch 9 and the small latch 13. The inner handle 2-1 also has a positioning rod 2-5, which... Figure 38 The U-shaped part is used to control the inner handle 2-1 in a fixed position. The inner handle 2-1 is separate from the inner lever 2-2, and the inner handle 2-1 is sleeved on the connecting shaft 2-6 of the inner lever.

[0057] Figure 3 The control panel 3 has a reset groove 3-1, a right outer groove 3-2, a right middle groove 3-3, and a right inner groove 3-4. The control panel 3 is fixed below the outer lever 2-3 of the outer handle 2, and... Figure 4 4. Isolation pusher Figure 5 5. Reset pusher Figure 6 6. Reset hook Figure 7 The unlocking pusher 7 is connected to the reset slot 3-1, right outer slot 3-2, right middle slot 3-3, and right inner slot 3-4 of the control disc 3, thus forming a... Figure 8 The situation is as shown. For example... Figure 8 As shown, the control panel 3 is controlled only by the outer handle 2. Only by pulling down or lifting the outer handle 2 can the reset push plate 5, the isolation push plate 4, the reset hook plate 6, and the unlocking push plate 7 be pushed down or pulled up.

[0058] Figure 9 The large latch 9 has a safety slot 9-1. When the safety block 44-1 located in the lock body is inserted into the safety slot 9-1, it can lock the large latch 9, preventing it from being forcibly pulled back into the lock. The large latch 9 also has a lever groove 9-2 for housing the outer lever 2-3 and the inner lever 2-2 on the inner and outer handles. The large latch 9 also has an anti-push opening 9-3 for... Figure 10 The anti-push block 10 is engaged within it. When the large bolt 9 extends outside the lock, as... Figure 11 As shown, the anti-push block 10 is locked in the anti-push opening 9-3 on the large bolt 9, preventing the large bolt 9 from being pushed to the right and back into the lock. Only when... Figure 12 As shown, after the correct password is entered, the outer handle 2 can be pulled downwards, allowing the outer lever 2-3 to swing to the right. Its top end then pushes the anti-push block 10 upwards from the anti-push opening 9-3. At this point, if the outer handle 2 is pulled downwards again, the outer lever 2-3 can pull the large bolt 9 to the right and retract it into the lock, thus opening the door.

[0059] Figure 13It is the small latch 13, with a beveled head on the left end. The buffer groove 13-1 on the small latch 13 is to prevent the small latch 13 from being pulled back into the lock immediately when the outer handle 2 is pulled down, leaving space for the implementation of other component functions. Figure 14 The connector 14 is connected to the small latch 13 and has a groove 14-1 for fitting the outer lever 2-3 and the inner lever 2-2 on the inner and outer handles together. The buffer block 14-2 on the connector 14 works in conjunction with the buffer groove 13-1 on the small latch 13 to buffer the pulling action.

[0060] Figure 15 This is a schematic diagram showing the relationship between the large and small latches and the lever in their normal states. At this time, the lever 2-3 is fitted within the large latch 9 and the small latch 13, with only the small latch 13 protruding outside the lock. The large spring 15-1 firmly pushes the connecting piece 14 to the left, while the small spring 15, located within the connecting piece 14, pushes the lever 2-3 to the right. The combined action of the two springs with different elastic forces stabilizes the lever 2-3 in this set position. When it is necessary to lock the door, such as... Figure 16 As shown, simply lifting the outer handle 2 upwards causes the outer lever 2-3 to swing to the left, compressing the small spring 15 and simultaneously pushing the large bolt 9 to the left and outwards, thus locking the door. At this time, the anti-push block 10 falls into the anti-push opening 9-3, preventing the large bolt 9 from being forcibly pushed back into the lock, thereby adding an extra layer of security to the lock.

[0061] The above explains the principle that pulling the outer handle 2 downwards retracts the large bolt 9 and small bolt 13 into the lock, thus opening the door. Whether the outer handle 2 can be pulled downwards is controlled by the lock cylinder. The lock cylinder consists of components such as the lock cylinder body, cylinder pin, isolation plate, control plate, limit plate, adjusting mechanism, and back cover. The control mechanism of the lock cylinder is explained below:

[0062] Figure 17 The lock cylinder body 17 has a control groove 17-1 and a limit groove 17-2, which respectively supply... Figure 21 Control panel 21 and Figure 22 The limiting disc 22 is set in it and rotates coaxially. The lock cylinder body is also provided with a steel shaft hole 17-4 and several cylindrical core pin holes 17-3 arranged in a circle.

[0063] Figure 18 The core pin 18 is machined from a cylindrical body and has a limiting groove 18-1, an upper flat block 18-2, a lower flat block 18-3, and a slot 18-4. Figure 19 It is the adjusting component 19, which has two limit feet 19-1, a strip opening 19-2, and two limit heads 19-3. Figure 19After the code-setting component is flipped, the two limit feet 19-1 can be fitted into the two slots 18-4 at the bottom of the core pin 18, allowing only vertical movement. When the code-setting component 19 is rotated, the core pin 18 will rotate accordingly. This is a component specifically designed for setting and adjusting the code from inside the lock, hence the name code-setting component. The core pin 18 and the code-setting component 19 are both fitted into the core pin hole 17-3 of the lock cylinder body 17.

[0064] Figure 20 The isolating disc 20 is fitted onto the outside of the lock cylinder body 17 and has several button holes 20-2 that are the same size and position as the core pin hole 17-3. When the button 25-1 is pressed, it enters the core pin hole 17-3 of the lock cylinder body 17 through these button holes 20-2. The right edge of the isolating disc 20 also has a push plate opening 20-1 for pushing the isolating disc 20 to rotate clockwise. The isolating disc 20 is sandwiched between the lock cylinder body 17 and the button 25-1. Under normal conditions, the button 25-1 can enter the core pin hole 17-3 of the lock cylinder body 17 through the button holes 20-2 of the isolating disc 20, thus pressing the core pin 18 in the hole. However, when the isolating disc 20 is rotated slightly, the core pin hole 17-3 on the lock cylinder body 17 is isolated by the isolating disc 20, and the button 25-1 can no longer enter the core pin hole 17-3, hence the name "isolating disc".

[0065] Figure 21 It is a control panel 21, equipped with a pusher port 21-1 and a circular groove 21-3. The size and position of the circular groove are similar to... Figure 20 The button holes 20-2 of the isolation disc 20 are the same, except that each circular groove 21-3 has a narrower strip groove 21-2 at its edge in a counterclockwise direction. The control disc 21 is fitted into the control groove 17-1 of the lock cylinder body 17 and can rotate coaxially. The core pin 18 passes through the circular groove 21-3 and intersects it perpendicularly, and can move longitudinally. The mechanism by which the cross-shaped upper flat block 18-2 and lower flat block 18-3 located in the middle of the core pin 18 can be moved from the circular groove 21-3 into the narrower strip groove 21-2 is used to restrict whether the control disc 21 can rotate clockwise, and thus control whether the outer handle 2 can be pulled down.

[0066] Figure 22 The limiting plate 22, similar in shape to the control plate 21, has several equally spaced and equally wide arc-shaped grooves 22-2 through which the core pin 18 passes and moves left and right. Each arc-shaped groove 22-2 has a spring groove 22-3, into which the limiting spring 23 is fitted, forming a... Figure 23 The situation is shown in the right figure. The limiting disc 22 is fitted in the limiting groove 17-2 of the lock cylinder body 17. Its left and right edges are respectively provided with push plate opening 22-1 and hook plate opening 22-4, which are used to push or hook the limiting disc 22 to rotate counterclockwise, thereby achieving the purpose of releasing the limit.

[0067] Figure 24 The back cover plate 24 has several circular holes arranged in a circle, each with a cross-shaped groove, forming a code adjustment port 24-1. The back cover plate 24 is fixed to the rear side of the lock cylinder body 17. The homeowner can adjust the code by rotating the code adjustment component 19 90 degrees through each code adjustment port 24-1.

[0068] Figure 25 It is a turntable 25, with buttons 25-1 fitted inside. The turntable 25 is fitted on the outside of the lock cylinder body 17 and can rotate coaxially. The buttons 25-1 can overlap with each core pin hole 17-3 on the lock cylinder body 17 and be inserted to press the core pin 18.

[0069] Figure 26 This is a cross-sectional view of the lock cylinder structure. The components arranged from top to bottom are: button 25-1, rotary dial 25, isolation disc 20, core pin 18, limit foot 19-1 on the adjustment mechanism, back cover plate 24, and limit head 19-3 on the adjustment mechanism. The control disc 21 intersects with the lower flat block 18-3 on the core pin 18. The limit spring 23, fitted onto the limit disc, is located above the upper flat block 18-2.

[0070] The mechanism that controls whether this lock can be opened, such as Figure 27 , Figure 28 , Figure 29 , Figure 30 As shown. From Figure 27 As can be seen above, in each circular slot 21-3 on the control panel 21, there is an adjacent flat block 18-3 of the core pin intersecting with it, but as Figure 27 As shown, different orientations of the lower flat block 18-3 will produce different results: The orientation of the lower flat block 18-3 is as follows... Figure 27 When positioned on the left, that is, perpendicular to the direction of the slot 21-2, the lower flat block 18-3 cannot be moved into the narrower slot 21-2, and the entire control panel 21 cannot be rotated clockwise. Only when all the lower flat blocks 18-3 are positioned in the same direction as the slot 21-2, as shown on the right side of the figure, can the control panel 21 be rotated clockwise, i.e., the lock can be opened. It can also be seen from the figure that there is a certain buffer distance between the unlocking push plate 7 and the push plate opening 21-1 on the control panel, so that when the outer handle 2 is pulled down, it will not immediately push the control panel 21 to rotate clockwise. This is to ensure... Figure 37 The isolation panel 20 shown serves to provide space. Figure 28 and Figure 29 This reveals the control mechanism by which the core pin 18 controls the movement or rotation of the "control disc": in such a way... Figure 28In the indicated state, the lower flat block 18-3 of the core pin is in the same direction as the strip groove 21-2, and the control panel 21 can move to the right. In effect, it means... Figure 27 Rotating the pin clockwise will open the lock, indicating that the number corresponding to this pin is not a combination, meaning this number cannot be pressed. If it is pressed incorrectly, the upper flat block 18-2 will move down into the circular groove 21-3. Because it is no longer in the same direction as the strip groove 21-2, the control panel 21 cannot be moved or rotated. Figure 29 The situation shown is exactly the opposite. If it is not pressed, the lower flat block 18-3 and the strip groove 21-2 are not in the same direction and cannot be moved into the narrower strip groove 21-2. The control panel 21 cannot move or rotate. Only after it is pressed can the upper flat block 18-2 and the strip groove 21-2 be in the same direction, thus meeting the unlocking conditions. This indicates that the number is the password that must be pressed. If it is missed, the lock will not be opened. Figure 30 The method for adjusting and setting the password is revealed as follows: Simply insert a small screwdriver into the strip-shaped opening 19-2 of the adjusting component through the adjusting port 24-1 on the back cover 24, press the adjusting component slightly downwards, rotate it 90 degrees, and then release. The two limit heads 19-3 on the adjusting component will be fixed after being twisted 90 degrees. The two limit feet 19-1 of the adjusting component, because they are inserted into the slots 18-4 of the core pin, will cause the lower flat block 18-3 and the upper flat block 18-2 to rotate 90 degrees together, thus adjusting the password. Figure 28 or Figure 29 The system adjusts and sets the password by rotating the adjusting component 19. This adjusts the lower flat block 18-3 of the core pin 18 so that it is perpendicular to the direction of the strip groove 21-2 on the control panel 21. This is the password that must be pressed to open the door; otherwise, it is a non-password that cannot be pressed.

[0071] When the core pin 18 of this lock is not pressed, it is in the following state: Figure 31 As shown, the limiting spring 23 is actually inactive. When the core pin 18 is pressed, it is as follows: Figure 32 As shown, the limiting spring 23 on the limiting plate 22 is engaged in the limiting groove 18-1 of the core pin 18, keeping the core pin 18 in the pressed position. After the door is opened, the limiting spring must be released promptly, i.e., the core pins 18 must be reset immediately to return to their original positions. Figure 31 The position is shown. The lock is reset by the reset push plate 5 and the reset hook plate 6. Before reset, the condition is as follows: Figure 33As shown, the limiting spring 23 is engaged with the core pin 18, the reset push plate 5 is tightly pressed against the push plate opening 22-1 of the limiting plate 22, and the reset hook plate 6 is still a certain distance from the hook plate opening 22-4. This lock has two reset methods: one is for when the password is accidentally entered incorrectly and a reset is necessary, such as... Figure 33 As shown, simply lifting the outer handle 2 upwards will cause the reset push plate 5 to push downwards, thereby pushing the limit plate 22 to rotate counterclockwise, producing a result similar to... Figure 34 The effect shown is that the limit spring 23 has disengaged from the core pin 18, and the core pin 18 automatically resets, allowing the password to be entered again; secondly, if the password is entered correctly, the outer handle 2 must be pulled down to open the door, which will result in... Figure 34 As shown, pulling down the outer handle will simultaneously cause the reset hook 6 to move down, thereby hooking the hook opening 22-4 on the right side of the limit plate 22. During the process of the outer handle 2 automatically lifting to return to its original state, it will automatically lift the reset hook 6, thereby hooking the limit plate 22 to rotate counterclockwise, causing the limit spring 23 to disengage from the core pin 18, thus achieving automatic reset.

[0072] Because only one button, 25-1, is exposed on the outside of this lock, and even a thin steel wire cannot penetrate to touch the internal pins 18, no one can discover which number is the combination from the outside. A thief can only use button 25-1 to press each of the internal pins 18, cracking the combination through different sounds and tactile sensations. Figure 35 As can be seen, only the limiting spring 23 extends into the core pin hole 17-3 and contacts the core pin 18. When the core pin 18 is pressed, the friction between it and the limiting spring 23 does produce a faint sound and feel. However, the limiting spring 23 can only touch the upper part of the core pin 18, and the structure of this upper part is the same regardless of whether it is a combination lock or not. Therefore, the sound and feel produced by the friction are necessarily the same, making it impossible to distinguish which part is the combination lock. On the core pin 18, only the upper flat block 18-2 and the lower flat block 18-3 in the middle part have different structures when the combination lock is set, and they are adjacent to the control panel 21. Figure 35 As can be seen, the control panel 21 does not extend into the pin holes 17-3 and does not directly contact the pin 18. Pressing the pin 18 does not produce sound or feel. However, if the thief pulls the outer handle 2 down as far as possible, it will... Figure 36As shown, when the control disc 21 is forcibly pushed slightly into the core pin hole 17-3, and it comes into contact with the upper flat block 18-2 and lower flat block 18-3 of the core pin 18, pressing the core pin 18 after this contact may produce a very faint difference in sound and feel, which could potentially be cracked by a skilled pickpocket. Although this possibility is extremely small, its very existence indicates that the lock's security is not 100%, and as a lock striving for perfection, it must be eliminated. The isolation disc 20 of this lock is specifically designed to eliminate this potential vulnerability: from... Figure 26 As can be seen, the isolation plate 20 is located between the button 25-1 and the pin 18. If the isolation plate 20 partially obscures the top of the pin 18, the button 25-1 cannot move down to press the pin 18. For example... Figure 37 As shown, the isolation disc 20 is located on the outside of the lock cylinder body 17. Its button hole 20-2 overlaps with the core pin hole 17-3 on the lock cylinder body. By gently pulling down the outer handle 2 slightly, the isolation push plate 4 immediately pushes the isolation disc 20-1, causing it to rotate clockwise and immediately block the core pin hole 17-3. The button 25-1 can no longer be inserted, making it impossible to distinguish the difference in sound and feel by moving the core pin 18. Furthermore, from... Figure 27 As can be seen, there is a certain distance between the unlocking pusher 7 and the pusher opening 21-1 of the control panel. This is intentionally designed so that the outer handle 2 can be pulled down a certain distance before it can push the control panel 21 to touch the core pin 18. By the time the control panel 21 can touch the core pin 18, the outer handle 2 has already been pulled down a certain distance, indicating that the isolation plate 20 has already rotated clockwise a certain distance, firmly blocking the button 25-1, preventing the button from entering and pushing the core pin 18 inside. The isolation disc 20 has three effects: First, if the outer handle 2 is not pulled down first, pressing button 25-1 produces the same sound and feel, making it impossible to distinguish any difference. Second, if the outer handle 2 is pulled down first, the isolation disc 20, being synchronized with the outer handle 2, will immediately rotate and block the core pin hole 17-3, preventing button 25-1 from being pressed in. Third, if button 25-1 is pressed down first, the button will jam the isolation disc 20, preventing it from rotating. The non-rotating isolation disc will then press against the outer handle 2 via the isolation push plate 4, preventing the outer handle from being pulled. In short, the isolation disc 20 completely eliminates the possibility of distinguishing the sound and feel by pulling down the outer handle 2 first and then pressing button 25-1, thus completely eliminating the only, extremely small, potential safety hazard of this lock outdoors, achieving zero flaws.

[0073] Because the inner handle 2-1 is sleeved on the connecting shaft 2-6 of the inner lever, it normally droops and needs to be kept in a horizontal position. The solution is: Figure 38 The U-shaped part is provided with a lifting groove 38-1 and a spring groove 38-2. After the spring is placed into the spring groove, it forms a... Figure 39 When the U-shaped part 38 is placed below the positioning rod 2-5, the spring will support the positioning rod 2-5. Since the upper end of the spring is restricted, the positioning rod 2-5 and the inner handle 2-1 connected to it will always remain in this position in the normal state, that is, to ensure that the inner handle 2-1 does not droop in the normal state but maintains a horizontal posture, which is convenient for the homeowner to use.

[0074] Figure 40 yes Figure 2 The inner lever 2-2 has a connecting hole 40 at the inner end of its connecting shaft 2-6 for the connecting pin 42-4 to be inserted. Figure 41 It is the other side of the inner handle 2-1, which is provided with a button groove 41 and a steel pin hole 41-1. Figure 42 It includes a rotary knob 42 and a connecting pin 42-4. The rotary knob 42 has a latch 42-1, and the connecting pin 42-4 has a latch head 42-2 and a push-pull button 42-3. The vertical latch head 42-2 can be inserted into the vertical latch head 42-1 and pulled out smoothly. However, when the rotary knob 42 is rotated 90 degrees, the vertical latch head 42-2 becomes stuck in the horizontal latch head 42-1 and cannot be pulled out, thus controlling whether the connecting pin 42-4 can be pulled. The normal state of the inner handle 2-1 is as follows... Figure 43 As shown, when a burglar attempts to open the door from the inside by inserting a hook through the peephole to press the inner handle 2-1, the inner handle 2-1 is separate from the connecting shaft 2-6, so it will only spin freely and cannot move the inner lever to open the door. This effectively prevents this common method of burglary. When the homeowner opens the door, they simply need to hold the inner handle 2-1 and pull the push-pull button 42-3 to the right with their thumb. This will move the connecting pin 42-4 to the right and insert it into the connecting hole 40 of the connecting shaft 2-6 of the inner lever, connecting the inner handle 2-1, the connecting shaft 2-6, and the inner lever 2-2 in the lock together. Pulling down the inner handle 2-1 will open the door. As soon as the hand is released, the connecting pin 42-4 will immediately and automatically move to the left under the action of the spring, so that the inner handle 2-1 is no longer connected to the inner lever, thus automatically maintaining the state of preventing unauthorized entry. For added safety, the rotary knob 42 located on the left end of the inner handle 2-1 can be rotated 90 degrees to ensure that the push-pull knob 42-3 cannot be moved. This design also prevents young children from opening the door and leaving the house on their own.

[0075] Figure 44The safety mechanism is set up from the inside. A safety button 44 is connected to a safety block 44-1, which is fitted onto the lock body. By turning the safety button 44 from the inside, the safety block 44-1 can be locked into the safety slot 9-1 of the large lock tongue 9, making it impossible for people outside to open the lock.

[0076] While this lock independently performs its anti-theft function using a purely mechanical structure, it is compatible with the alarm functions of electronic smart locks, and has reserved interfaces to allow the alarm functions of electronic smart locks to be ported in as auxiliary functions. However, the relevant electronic functions are not included in the scope of this application and therefore will not be described in detail.

[0077] The above embodiments are merely illustrative and explanatory of the methods and principles involved in this application in conjunction with the illustrations. They do not imply that the content of this application is limited to the form described in the above specific embodiments. Any implementation method or technical solution that is the same as or similar to the methods and principles disclosed in this specific embodiment is within the protection scope of this invention.

Claims

1. A concealed key mechanical combination lock, comprising a lock body, a bolt, a core pin, a handle, and a button, characterized in that: The lock cylinder includes a lock cylinder body, a control disc, a core pin, a switching element, a limit disc, a back cover plate, and an isolation disc. The lock cylinder body is a block structure with a steel shaft hole in the center for inserting a steel shaft, and several cylindrical core pin holes arranged in a circle around the steel shaft hole for inserting core pins. The lock cylinder body also has parallel control grooves and limit grooves that intersect perpendicularly with the core pin holes, allowing the control disc and limit disc to rotate coaxially around the steel shaft. The control disc is a plate structure that fits in the control groove of the lock cylinder body and can rotate under external force. The control disc has circular grooves with the same position and size as the core pin holes on the lock cylinder body for the core pin to pass through, and each circular groove has a relatively narrow strip groove in the counterclockwise direction to control whether the flat block on the core pin can move into it. The core pin is cylindrical in shape and can rotate or move longitudinally within a cylindrical core pin hole on the lock cylinder. The core pin has a limiting groove for a limiting spring to engage, maintaining the core pin's position after it is pressed. In the middle of the core pin, there are two flat blocks that intersect in a cross shape to control the rotation of the control disc. A code-changing component is connected to the core pin and can drive its rotation. The code-changing component is located at the code-changing port on the rear cover; rotating it from the port rotates the core pin to adjust the code. The limiting disc is fitted into the limiting groove of the lock cylinder and rotates coaxially. It can rotate under external pressure or hooking. At the same position as all the core pin holes, there are arc-shaped grooves for the core pin to move horizontally, allowing the limiting spring to... The plate protrudes into the arc-shaped groove and locks into the limiting groove of the core pin, thus limiting its movement. Rotating the limiting plate causes the spring to move out of the limiting groove of the core pin, thereby resetting the core pin. The rear cover plate is fixed to the rear side of the lock cylinder body and has a cross-shaped adjustment slot at each core pin hole to fix the adjustment piece after rotation. The isolation plate is sleeved on the outside of the lock cylinder body and rotates coaxially. It has a button hole with the same position and size as the core pin hole on the lock cylinder body, allowing the button to pass through and enter the core pin hole. The isolation plate is controlled by the handle. Pulling the handle will cause the isolation plate to rotate immediately and separate the button, preventing the button from being pressed. The handle includes an outer handle, an outer lever, an inner lever, and an inner handle. The outer handle is located outside the lock body, connects to the outer lever inward, and swings coaxially with the outer lever. A control disc is fixed at the central axis of the outer lever, swinging coaxially with the outer lever under external force. The control disc has four slots for connecting the isolating push plate, reset push plate, reset hook plate, and unlocking push plate, which are pressed down or hooked up as the outer handle is pulled down or lifted. One end of the isolating push plate is connected to the control disc, while the other end abuts against the isolating plate outside the lock cylinder, rotating as the outer handle is pulled down. One end of the reset push plate is connected to the control disc, while the other end abuts against the limiting plate inside the lock cylinder, rotating as the outer handle is lifted to reset the core pin. One end of the reset hook plate is connected to the control disc, while the other end has a hook, hooking the reset plate and pulling it back as the outer handle is pulled down and automatically returns to its original position. The reset disc rotates to reset the core pin; one end of the unlocking push plate is connected to the control disc, and the other end abuts against the control disc. The rotation of the control disc controls whether the outer handle can be pulled down; the inner lever is adjacent to the outer lever, sleeved between the outer lever and the inner handle, and can swing coaxially. The central axis of the inner lever has a connecting shaft facing inward, and the outer end of the connecting shaft has a transverse connecting hole for the connecting pin sleeved in the inner handle to be inserted; the inner handle is located in the interior, and its main end is located on the connecting shaft of the inner lever. The inner handle has a button opening and a longitudinal steel pin hole for the connecting pin to be inserted; the connecting pin has a button that can push the connecting pin to move longitudinally, and one end has a locking head so that it can be controlled by a rotatable control button;The lock works by concealing all the pins controlling the external handle's descent within the lock cylinder, covered by a rotating disc. This prevents anyone from seeing or probing the pins. The disc has only one button; rotating it to the designated combination position and pressing it activates the pins below the combination, opening the door. Only a fingerprint is left under this single button, and the sound and feel of pressing any combination are identical, making it impossible to crack the combination using fingerprints, sound, or touch. The combination can be any number of pins, freely set by the homeowner. The internal handle, located inside the door, is designed to automatically separate from the bolt in normal operation. Attempts to open the door by inserting a hook from the outside will only result in the handle spinning freely; someone inside must hold the handle and press the button simultaneously to open the door.

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