Improved structure of pin-tumbler lock cylinder with matching key

Abstract

The utility model discloses a kind of pin hidden type lock cylinder improvement structure with matching key, including cylindrical inner lock cylinder, the outer lock cylinder of being rotatable and being sleeved in the outer portion of inner lock cylinder and the key matched with inner lock cylinder and can drive its rotation, the end of inner lock cylinder is equipped with the keyhole corresponding with key, keyhole extends to inner lock cylinder inside along the axial direction of inner lock cylinder, key includes sub-key, push rod one and push rod two;Push rod one and push rod two are connected with sub-key, the end of push rod two in keyhole and push rod one are connected and can rotate around junction. The scheme is pushed upward by push rod one and push rod two, so that the key teeth of sub-key can be exposed in full, to guarantee the contact rate when unlocking, improve unlocking success rate. Various key teeth tip shapes are designed to solve the security problem when the length of key teeth is the same, and the length of key teeth is also the same when key teeth tip is the same.

Description

Technical Field

[0001] This utility model relates to the field of mechanical lock technology, specifically an improved structure of a pin tumbler concealed lock cylinder with a matching key. Background Technology

[0002] Currently, there are many types of locks on the market. According to the working principle and structure of the lock cylinder, they can be roughly divided into three types: the first type is mechanical door lock, which mainly uses pin tumbler lock cylinder; the second type is electronic door lock, which uses electronic chip in its lock cylinder; and the third type is magnetic lock, which uses a permanent magnet with a specific magnetic strength in its lock cylinder.

[0003] Electronic locks are opened by entering a password (electronic combination lock) or verifying whether the electronic information in the room card chip matches the information in the lock cylinder (room card lock). There is currently no way to test open this type of lock cylinder device in a short time. However, electronic locks require external power and have a low level of electronic integration. Therefore, this type of lock cylinder device cannot be widely used by residential or office users.

[0004] The unlocking mechanism of a magnetic lock is essentially similar to that of a pin tumbler lock. Instead of relying on direct contact between the pins and the key teeth, it uses a pair of permanent magnets with specific magnetic strengths to repel each other, thereby adjusting the relative position of the pin ends and the lock cylinder end face. However, because it has fewer pins, it is more likely to be opened by trial and error, so magnetic locks have gradually decreased in the market in recent years.

[0005] Typically, locks used in homes and most offices are tumbler locks. These lock cylinders offer good mechanical stability, are technologically mature, and are inexpensive. Their basic principle is to control the lock's opening by adjusting the relative positions of the interfaces between the two sections of pins (key pins and locking pins) and the inner and outer lock cylinder interfaces. However, because a portion of the pins in a tumbler lock protrudes from the keyhole, thieves can observe or directly manipulate the pins through the keyhole, allowing them to attempt to open the lock using methods such as "tin foil picking" or "wire picking," resulting in a low level of security.

[0006] Pin tumbler locks are the preferred choice for residential security and office door locks. To overcome their vulnerability to being picked by trial and error, current measures focus on increasing the complexity of the mechanical lock cylinder. Taking pin tumbler locks as an example, they have undergone three generations of updates: Class A, Class B, and Super B. Their mechanical structures have become increasingly complex, with the latest Super B locks containing over 100 parts. While the difficulty of technically picking them is increasing, the increased number of parts also leads to greater manufacturing complexity and higher costs, making widespread adoption increasingly difficult.

[0007] Chinese patent number ZL201620709595.2 discloses a hidden pin tumbler lock cylinder with a matching key. The pins are concealed within the pin mounting strip, making them invisible from the keyhole and impossible to move directly, resulting in higher security. It also boasts a compact structure, simple manufacturing, and low cost. However, this technology suffers from insufficient tooth development, leading to slippage and a low unlocking success rate. Furthermore, the key tooth structure is simple, resulting in poor anti-theft performance. Utility Model Content

[0008] The purpose of this utility model is to overcome the problems mentioned in the background art and provide an improved structure for a pin tumbler concealed lock cylinder with a matching key. This structure is improved so that all the teeth are exposed, ensuring the contact rate during unlocking and improving the unlocking success rate.

[0009] The objective of this utility model is mainly achieved through the following technical solutions:

[0010] An improved structure for a concealed pin tumbler lock cylinder with a matching key includes a cylindrical inner lock cylinder, a rotatable outer lock cylinder fitted outside the inner lock cylinder, and a key that matches and drives the inner lock cylinder to rotate. One end of the inner lock cylinder has a keyhole corresponding to the key, which extends axially into the inner lock cylinder. The key includes a sub-key, a push rod one, and a push rod two. The sub-key is located inside the keyhole. One end of both push rod one and push rod two is located inside the keyhole, and the other end extends out of the outer lock cylinder along the keyhole. Both push rod one and push rod two are connected to the sub-key. The end of push rod two located inside the keyhole is connected to push rod one and can rotate around the connection point. To address the problem of insufficient tooth protrusion leading to slippage and low unlocking success rate in existing technologies, this solution designs an improved tumbler-type concealed lock cylinder structure with a matching key. It combines a cylindrical inner lock cylinder, a rotatable outer lock cylinder fitted outside the inner lock cylinder, and a key that matches and drives the inner lock cylinder. One end of the inner lock cylinder has a keyhole corresponding to the key, extending axially into the inner lock cylinder. The keyhole is a slotted hole for easy key insertion. The key includes a sub-key, a push rod one, and a push rod two. The sub-key is located inside the keyhole. One end of both push rod one and push rod two is located inside the keyhole, while the other end extends outward along the keyhole from the outer lock cylinder. Both push rod one and push rod two are connected to the sub-key and drive its movement. The end of push rod two inside the keyhole is connected to push rod one and can rotate around the connection point. By pushing push rod one and push rod two upward, the teeth of the sub-key are fully exposed, ensuring a high contact rate during unlocking and improving the unlocking success rate.

[0011] Furthermore, a return spring is provided between push rod one and push rod two, and the return spring is connected to both push rod one and push rod two, and the return spring is located in the keyhole. Through the return spring, after the push rods are released, the distance between the push rods can return to its original position.

[0012] Furthermore, the key teeth of the sub-key can be one or more of the following shapes: triangle, circle, semicircle, and square. The shape of the key tooth tips can solve the security problem when the key teeth are of the same length. Similarly, when the key tooth tips are the same, the length of the key teeth can solve the security problem and improve anti-theft performance. The shape of the key teeth can be diversified and designed as needed, including one or more of the following: triangle, upper triangle, lower triangle, left triangle, right triangle, circle, left semicircle, right semicircle, and square. The shape of the tooth tips can be arbitrarily changed to form a shape-based code.

[0013] Furthermore, the inner lock cylinder has a pin mounting strip on its side corresponding to the keyhole. The pin mounting strip is fixedly connected to the inner lock cylinder as a whole. The interior of the pin mounting strip has multiple pin holes penetrating its opposite sides. All pin holes are distributed along the axial direction of the inner lock cylinder, and each pin hole contains a corresponding pin. The outer lock cylinder has a pin groove setting strip corresponding to the pin mounting strip near its part. The pin groove setting strip is fixedly connected to the outer lock cylinder. The side of the pin groove setting strip near the pin mounting strip has multiple pin grooves that can accommodate corresponding pins. Each pin groove contains a spring that can extend and retract along the direction of the pin groove. One end of each spring is fixedly connected to the bottom of the pin groove, and the other end is fixedly connected to the corresponding pin. The two ends of the pin hole are respectively connected to the keyhole and the corresponding pin groove. The pin is slidably connected to the corresponding pin hole or pin groove. The sub-key can extend or retract from the keyhole and press all the pins into the corresponding pin groove. By concealing the pins within the pin mounting strip of the inner lock cylinder, they cannot be observed or directly moved from the keyhole. Thieves cannot attempt to open the lock using methods such as "tin foil picking" or "wire picking," resulting in a higher level of security. Furthermore, its compact structure, simple manufacturing, and low cost make it suitable for widespread use. To use, simply insert the matching key into the keyhole and extend the matching sub-key to press all the pins within the pin mounting strip into their corresponding slots. Turning the key then rotates the inner lock cylinder, unlocking it. Conversely, turning the key in the opposite direction returns the inner lock cylinder to its original position, and retracting the sub-key causes the pins in the slots to be compressed by the spring, locking the inner lock cylinder and preventing rotation. The operation is convenient and quick. Furthermore, different shapes and sizes of pins can be used with corresponding springs, and different pin hole spacings can be designed, further enhancing the product's security and making it even more difficult for thieves to open.

[0014] In summary, compared with the prior art, this utility model has the following advantages: This solution uses push rod one and push rod two to push upwards, allowing all the key teeth of the sub-key to be exposed, thereby ensuring the contact rate during unlocking and improving the success rate of unlocking. Designing various key tooth tip shapes can solve the security problem when key teeth are of the same length; similarly, when key tooth tips are the same, the length of the key teeth can solve the security problem. Attached Figure Description

[0015] The accompanying drawings, which are included to provide a further understanding of the embodiments of the present invention and form part of this application, do not constitute a limitation thereof. In the drawings:

[0016] Figure 1 This is a schematic diagram of the structure of this utility model.

[0017] Figure 2 This is a schematic diagram of the structure of the inner and outer lock cylinder end faces of this utility model.

[0018] Figure 3 This is a schematic diagram of the movement trajectory of the key teeth.

[0019] The names corresponding to the reference numerals in the attached figures are:

[0020] 1-Outer lock cylinder, 2-Spring, 3-Inner lock cylinder, 4-Pin, 5-Key tooth, 6-Sub-key, 7-Rivet 1, 8-Rivet 2, 9-Rivet 3, 10-Keyhole, 11-Push rod 2, 12-Return spring, 13-Push rod 1, 14-Spring groove setting strip, 15-Pin mounting strip. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] In the description of this utility model, it should be understood that the directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this utility model. The directional terms "inner" and "outer" refer to the inner and outer contours of each component itself.

[0023] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this utility model.

[0024] like Figure 1 As shown, this embodiment includes a cylindrical inner lock cylinder 3, a rotatable outer lock cylinder 1 fitted outside the inner lock cylinder 3, and a key that matches the inner lock cylinder 3 and can drive it to rotate. One end of the inner lock cylinder 3 is provided with a keyhole 10 corresponding to the key. The keyhole 10 extends into the inner lock cylinder 3 along the axial direction. The side of the inner lock cylinder 3 is provided with a tumbler mounting strip 15 corresponding to the keyhole. The tumbler mounting strip 15 is fixedly connected to the inner lock cylinder 3 as a whole, preferably by welding. The interior of the tumbler mounting strip 15 is provided with multiple bullet holes penetrating its opposite sides. All bullet holes are distributed along the axial direction of the inner lock cylinder, which can be evenly distributed or unevenly distributed. Each bullet hole is provided with a corresponding tumbler 4. The end of the tumbler 4 near the keyhole is preferably flush with the opening of the bullet hole near the keyhole, and the other end preferably extends into the corresponding bullet groove. The outer lock cylinder 1 has a corresponding pin groove setting strip 14 near the pin mounting strip. The pin groove setting strip 14 is fixedly connected to the outer lock cylinder 1, preferably by welding or integral molding. The side of the pin groove setting strip 14 near the pin mounting strip 15 has multiple pin grooves capable of accommodating corresponding pins. Each pin groove contains a spring 2 that can extend and retract along the groove direction. One end of each spring 2 is fixedly connected to the bottom of the groove, and the other end is fixedly connected to the corresponding pin 4. The two ends of the pin hole are respectively connected to the keyhole and the corresponding pin groove. The pin 4 is slidably connected to the corresponding pin hole or pin groove. The sub-key 6 can extend or retract from the keyhole and press all pins 4 into the corresponding pin groove.

[0025] This utility model product conceals the pin 4 within the pin mounting strip of the inner lock cylinder. The pin 4 cannot be observed or directly moved from the keyhole, preventing thieves from attempting to open it using methods such as "tin foil unlocking" or "wire unlocking," thus increasing security. Furthermore, its compact structure, simple manufacturing, and low cost make it suitable for widespread use. To use, simply insert the matching key into the keyhole and control the matching sub-key 6 to extend the key, pressing all the pins 4 within the pin mounting strip into their corresponding slots. Turning the key then rotates the inner lock cylinder, unlocking it. Conversely, turning the key in the opposite direction returns the inner lock cylinder to its original position, and retracting the sub-key causes the pins 4 within the slots to be pressed back into the pin mounting strip by the compression force of the spring 2, locking the inner lock cylinder and preventing rotation. The operation is convenient and quick. Furthermore, by using pins 4 of different shapes and sizes in conjunction with corresponding springs 2, and designing different pin hole spacings, the product's security is further enhanced, making it even more difficult for thieves to open.

[0026] The key includes a sub-key 6, a push rod 13, and a push rod 2 11. The sub-key 6 is located inside the keyhole 10. One end of both push rod 13 and push rod 2 11 is located inside the keyhole 10, while the other end extends out of the outer lock cylinder 1 along the keyhole 10. Push rod 13 is connected to the support leg below the sub-key 6 by a rivet 17. The rivet 17 passes through push rod 13 and connects to the support leg, allowing push rod 13 to rotate around the rivet 17. Rotation of push rod 13 causes the sub-key 6 to move up and down. Push rod 2 11 is connected to the support leg below the sub-key 6. One support leg is connected by rivet three 9, which passes through both push rod two 11 and the support leg. Push rod two 11 can drive the sub-key 6 to move up and down. The end of push rod two 11 located in the keyhole is connected to push rod one 13 by rivet two 8. Both push rod one 13 and push rod two 11 can rotate around rivet two 8. In use, the relative movement of push rod one 13 and push rod two 11 pushes the sub-key 6 upward from the two support legs, so that all the key teeth of the sub-key can be exposed, thereby ensuring the contact rate when unlocking and improving the unlocking success rate.

[0027] A return spring 12 is provided between push rod 13 and push rod 2 11, and the return spring 12 is connected to both push rod 13 and push rod 2 11. The return spring 12 is located in the keyhole. Through the return spring 12, after the push rod is released, the distance between the push rods can return to its original position.

[0028] The key teeth 5 of the sub-key 6 can be one or more of the following shapes: triangle, circle, semicircle, and square. The shape of the key tooth tips can solve the security problem when the key teeth are of the same length. Similarly, when the key tooth tips are the same, the length of the key teeth can solve the security problem and improve anti-theft performance. The shape of the key teeth can be diversified and designed as one or more of the following: triangle, upper triangle, lower triangle, left triangle, right triangle, circle, left semicircle, right semicircle, and square. The shape of the tooth tips can be arbitrarily changed to form a shape code. Correspondingly, the key tooth outlet is also designed according to the tooth tip structure as one or more of the following: triangle, upper triangle, lower triangle, left triangle, right triangle, circle, left semicircle, right semicircle, and square. This ensures that the tooth tips are not obstructed when exposed, and the tumblers also form a corresponding structure so that the tooth tips can cooperate with the tumblers.

[0029] Contents not described in detail in this specification are existing technologies known to those skilled in the art. Standard parts used in this invention can all be purchased commercially, and irregularly shaped parts can be custom-made according to the description and drawings. The specific connection methods for each part all employ conventional methods such as bolts, rivets, and welding, which are already mature technologies. The machinery, parts, and equipment all use conventional models from the prior art, and the circuit connections also employ conventional connection methods from the prior art, which will not be detailed here.

[0030] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An improved structure for a concealed pin tumbler lock cylinder with a matching key, comprising a cylindrical inner lock cylinder (3), a rotatable outer lock cylinder (1) fitted outside the inner lock cylinder, and a key that matches the inner lock cylinder (3) and can drive it to rotate, wherein one end of the inner lock cylinder (3) is provided with a keyhole (10) corresponding to the key, and the keyhole (10) extends along the axial direction of the inner lock cylinder (3) into the interior of the inner lock cylinder (3), characterized in that: The key includes a sub-key (6), a push rod one (13) and a push rod two (11). The sub-key (6) is located inside the keyhole (10). One end of the push rod one (13) and the push rod two (11) are both located inside the keyhole, and the other end extends out of the outer lock cylinder (1) along the keyhole (10). The push rod one (13) and the push rod two (11) are both connected to the sub-key (6). The end of the push rod two (11) located inside the keyhole (10) is connected to the push rod one (13) and can rotate around the connection.

2. The improved structure of the concealed pin tumbler lock cylinder with matching key according to claim 1, characterized in that: A return spring (12) is provided between the first push rod (13) and the second push rod (11), and the return spring (12) is connected to both the first push rod (13) and the second push rod (11). The return spring (12) is located in the keyhole.

3. The improved structure of the concealed pin tumbler lock cylinder with matching key according to claim 1, characterized in that: The key teeth (5) of the sub-key (6) are shaped as one or more of the following: triangle, circle, semicircle, and square.

4. The improved structure of the concealed pin tumbler lock cylinder with matching key according to claim 1, characterized in that: The inner lock cylinder (3) has a pin mounting strip (15) on its side corresponding to the keyhole (10). The pin mounting strip (15) is fixedly connected to the inner lock cylinder (3) as a whole. The inside of the pin mounting strip (15) has a plurality of pin holes that pass through its opposite sides. All the pin holes are distributed along the axial direction of the inner lock cylinder, and each pin hole has a pin (4) corresponding to the pin hole.

5. The improved structure of the concealed pin tumbler lock cylinder with matching key according to claim 4, characterized in that: The outer lock cylinder (1) is provided with a spring groove setting strip (14) corresponding to the spring groove setting strip (15) near the spring tumbler mounting strip (15). The spring groove setting strip (14) is fixedly connected to the outer lock cylinder (1). The side of the spring groove setting strip (14) near the spring tumbler mounting strip (15) is provided with multiple spring grooves that can accommodate the corresponding spring tumblers.

6. The improved structure of the concealed pin tumbler lock cylinder with matching key according to claim 5, characterized in that: Each of the spring grooves is provided with a spring (2) that can extend and retract along the direction of the spring groove. One end of each spring (2) is fixedly connected to the bottom of the spring groove, and the other end is fixedly connected to the corresponding ball (4).

7. The improved structure of the concealed pin tumbler lock cylinder with matching key according to claim 6, characterized in that: The two ends of the bullet hole are respectively connected to the keyhole and the corresponding bullet groove. The bullet (4) is slidably connected to the corresponding bullet hole or bullet groove. The sub-key (6) can extend or retract from the keyhole and press all the bullets (4) into the corresponding bullet groove.

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