A pin tumbler lock with no pin exposure

Abstract

The application discloses a pin lock with concealed pins, which comprises a key, a lock body, a first layer of lock core, pins and a second spring, the pins are located in the first pin hole of the lock body and the second pin hole of the first layer of lock core, and the first layer of lock core can rotate relative to the lock body after unlocking; the end surface of the pin is parallel to the key hole or is located below the key hole; the key comprises a sleeve, a push rod, a spring sheet and a thimble, one end of the spring sheet is fixed to the inner wall of the sleeve, the other end of the spring sheet is raised and the thimble is fixed below the other end, a through hole is arranged on the sleeve directly below the thimble, and the thimble is located in the sleeve when the spring sheet is not compressed; a boss is arranged on the push rod, the push rod is horizontally and slidingly connected in the sleeve, the boss contacts the spring sheet to press the thimble out of the through hole in the process of sliding of the push rod, and the pin is pressed down. The pin lock with concealed pins solves the problem of pin leakage, hides the unlocking secret in the key, and greatly improves the safety and reliability.

Description

Technical Field

[0001] This invention relates to the field of anti-theft lock technology, and in particular to a pin tumbler lock that prevents the pins from being exposed. Background Technology

[0002] Currently, the most commonly used locks worldwide are the pin tumbler locks, invented in 1848 by American Yale Lynas, which employ cylindrical pins. Modern pin tumbler locks have evolved to include two-way, three-way, and four-way pins, master pins, as well as flat, double-sided, multi-sided, double-row double-sided, multi-row multi-sided pin structures and combined pin structures. Regardless of the structure, the unlocking principle of a pin tumbler lock is that the key teeth push the pins in the lock cylinder to displace them, thus opening the lock. Because the key teeth in existing pin tumbler locks are fixed, the pins in the lock cylinder must be designed with their ends protruding into the keyhole. Only with this design can the key teeth contact and push the pins. Therefore, existing locks all share a common feature: exposed pin ends. These exposed pin ends can be directly touched by foreign objects (such as wire hooks) and technically opened. In other words, these exposed pins reveal the "secret" of unlocking, making technical unlocking possible.

[0003] To ensure security, it is necessary to design a lock that prevents the pins from protruding and cannot be opened by objects such as wire hooks. Summary of the Invention

[0004] This invention provides a pin tumbler lock that prevents the pins from protruding, thereby solving the aforementioned technical problems.

[0005] The technical solution adopted in this invention is: a pin tumbler lock with non-exposed pins, including a key, a lock body, a first-layer lock cylinder, pins, and a second spring. The lock body is provided with a plurality of first pin holes, the first-layer lock cylinder is provided with a plurality of second pin holes, the second spring is located in the first pin holes, and a plurality of pins are located in the first pin holes and the second pin holes. A keyhole is provided in the middle of the first-layer lock cylinder, and the first-layer lock cylinder can rotate relative to the lock body after unlocking.

[0006] The end face of the pin is parallel to the keyhole or located below the keyhole;

[0007] The key includes a sleeve, a push rod, a spring plate, and a pin. One end of the spring plate is fixed to the inner wall of the sleeve, and the other end of the spring plate is raised with the pin fixed below it. A through hole is provided on the sleeve directly below the pin. When the spring plate is not compressed, the pin is located inside the sleeve. A boss is provided on the push rod, and the push rod is horizontally slidably connected to the sleeve. During the sliding of the push rod, the boss contacts the spring plate and presses the pin out of the through hole, thereby pressing down the tumbler.

[0008] Furthermore, it also includes at least one second lock cylinder, which is located between the lock body and the first lock cylinder. The second lock cylinder is provided with a plurality of third pin holes corresponding to the positions of the first pin holes and the second pin holes, and pins are provided in the third pin holes.

[0009] Furthermore, it also includes a return device for returning the push rod to its original position.

[0010] Furthermore, the return device includes a return cylinder and a first spring. The return cylinder is fixed to the bottom end of the sleeve, one end of the push rod is located inside the return cylinder, and the first spring is fixed between one end of the push rod and the return cylinder. The first spring is in a compressed state.

[0011] Furthermore, the return device is a third spring, one end of which is fixed inside the sleeve and the other end is fixed on the push rod.

[0012] Furthermore, a first scale is provided on one end of the push rod located outside the sleeve.

[0013] Furthermore, a second scale is provided on the outer wall of the sleeve.

[0014] Furthermore, a third scale is provided on the first and second lock cylinder end faces located at one end of the keyhole.

[0015] Furthermore, it also includes a locking tongue, which can be rotated by the rotation of the first-layer lock cylinder.

[0016] Furthermore, it also includes a latch, which can be rotated by the rotation of the second lock cylinder.

[0017] The beneficial effects of this invention are:

[0018] 1) The pin tumbler lock of the present invention effectively solves the problem of pin tumbler "leaking" and at the same time perfectly hides the "secret" of unlocking in the key, greatly improving security and reliability.

[0019] 2) The lock cylinder can be designed as double or multi-layered, and the lock cylinder can be opened layer by layer using a key.

[0020] 3) This pin tumbler lock makes no sound when the lock cylinder is turned, and the unlocking secret cannot be found using a stethoscope or other detection tools. Therefore, the double-layer lock cylinder is safer and more reliable than current combination locks. Attached Figure Description

[0021] Figure 1 This is a cross-sectional view of the pin tumbler lock disclosed in Embodiment 1 of the present invention, which has a pin tumbler that does not expose the pins.

[0022] Figure 2This is a left view of the pin tumbler lock disclosed in Embodiment 1 of the present invention, which has pins that do not protrude.

[0023] Figure 3 This is a perspective view of the key disclosed in Embodiment 1 of the present invention.

[0024] Figure 4 This is a left view of the key disclosed in Embodiment 1 of the present invention.

[0025] Figure 5 This is a left view of the pin tumbler lock disclosed in Embodiment 2 of the present invention, which has pins that do not protrude.

[0026] Figure 6 for Figure 5 Sectional view along line AA.

[0027] Figure 7 for Figure 5 Sectional view along the BB direction.

[0028] Reference numerals: 1. Key; 11. Sleeve; 12. Push rod; 121. Boss; 13. Return device; 131. Return cylinder; 132. First spring; 14. Spring plate; 15. Pin; 2. Lock body; 21. First pin hole; 3. First lock cylinder; 31. Second pin hole; 32. Keyhole; 4. Second lock cylinder; 41. Third pin hole; 5. Pin; 6. Second spring. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be described in further detail below with reference to the accompanying drawings, but the embodiments of the present invention are not limited thereto.

[0030] Example 1:

[0031] See Figure 1-2 This embodiment discloses a pin tumbler lock with non-exposed pins. Similar to existing technologies, existing pin tumbler locks also include a key, a lock body 2, a first-layer lock cylinder 3, pins 5, and a second spring 6. The lock body 2 has several first pin holes 21, the first-layer lock cylinder 3 has several second pin holes 31, the second spring 6 is located within the first pin holes 21, and several pins 5 are located within the first pin holes 21 and second pin holes 31. The first-layer lock cylinder 3 has a keyhole 32 in its center, allowing the first-layer lock cylinder 3 to rotate relative to the lock body 2 after unlocking.

[0032] The following are the differences between this embodiment and the prior art: In this embodiment, the end face of the pin 5 of the pin lock is parallel to or below the keyhole 32. Therefore, it can be seen that the pin 5 in this embodiment never protrudes, thus effectively solving the problem of "leaking" information due to the exposed pin 5.

[0033] See Figure 3-4 In this embodiment, the key 1 includes a sleeve 11, a push rod 12, a spring plate 14, and a pin 15. One end of the spring plate 14 is fixed to the inner wall of the sleeve 11, and the other end of the spring plate 14 is raised with the pin 15 fixed below it. A through hole is provided on the sleeve 11 directly below the pin 15. When the spring plate 14 is not compressed, the pin 15 is located inside the sleeve 11. A boss 121 is provided on the push rod 12. The push rod 12 is horizontally slidably connected to the sleeve 11. During the sliding process of the push rod 12, the boss 121 contacts the spring plate 14 and presses the pin 15 out of the through hole, thereby pressing down the tumbler 5. In some other embodiments, the spring plate 14 can also be fixed in the following way: both ends of the spring plate 14 are fixed to the sleeve 11, the middle of the spring plate 14 is raised, and the pin 15 is fixed below it.

[0034] To return the pushed-out push rod 12 to its original position, this embodiment also includes a return device 13, see [link to documentation]. Figure 3-4 The return device 13 includes a return cylinder 131 and a first spring 132. The return cylinder 131 is fixed to the bottom end of the sleeve 11. One end of the push rod 12 is located inside the return cylinder 131. The first spring 132 is fixed between one end of the push rod 12 and the return cylinder 131, and the first spring 132 is in a compressed state. In some embodiments, the return device can be a third spring (not shown in the figure), one end of which is fixed inside the sleeve, and the other end is fixed to the push rod.

[0035] Furthermore, to accurately determine the depth of the push rod 12's advance, a first graduation (not shown in the figure) can be provided on one end of the push rod 12 located outside the sleeve 11. To accurately determine the depth of the sleeve 11's advance, a second graduation (not shown in the figure) can be provided on the outer wall of the sleeve 11.

[0036] This embodiment also includes a latch (not shown in the figure), and the rotation of the first layer lock cylinder 3 can drive the latch to rotate.

[0037] In this embodiment, multiple bosses 121 can be provided on the push rod 12. Similarly, multiple spring plates 14 can also be provided. The pins 15 on different spring plates 14 have different fixing positions, and the pins 15 can also be set to different lengths, so that the displacement of the pins 15 is different when the spring plate 14 is compressed, which increases the difficulty of cracking. In addition, some of the first pin holes 21 and second pin holes 31 can be left uninserted, thereby increasing the deception and increasing the difficulty of cracking.

[0038] The working principle of this embodiment is as follows: Since several pins 5 are located in the first pin hole 21 and the second pin hole 31, when the lock is not unlocked, the pins 5 are located at the interface between the lock body 2 and the first layer lock cylinder 3, so that the first layer lock cylinder 3 cannot rotate relative to the lock body 2, and thus the bolt cannot rotate. At this time, the pin lock is in a locked state. When it is necessary to unlock, the sleeve 11 of the key 1 is inserted into the key hole 32. The insertion depth varies depending on the key 1 and the pin lock. For example, the sleeve 11 is inserted into the key hole 32 by five centimeters. At this time, the ejector pin 15 is located directly above the pin 5. Then, the push rod 12 is pushed forward by one centimeter. At this time, the boss 121 applies pressure to the spring plate 14, causing the ejector pin 15 to extend downward by 2mm, so that the entire pin 5 is lowered by 2mm. This causes the interface of the adjacent pins 5 to coincide with the interface of the lock body 2 and the first layer lock cylinder 3, so that the first layer lock cylinder 3 can rotate relative to the lock body 2. The first layer lock cylinder 3 then drives the bolt to rotate, completing the unlocking.

[0039] Example 2

[0040] This embodiment discloses a pin tumbler lock that prevents the pins from protruding. The difference between this embodiment and Embodiment 1 is that, see [link to Embodiment 1]. Figure 5-7 This embodiment also includes a second lock cylinder 4, which is located between the lock body 2 and the first lock cylinder 3. The second lock cylinder 4 is provided with a plurality of third pin holes 41 corresponding to the positions of the first pin hole 21 and the second pin hole 31, and pins 5 are provided in the third pin holes 41.

[0041] In this embodiment, a third scale (not shown in the figure) is provided on the end face of the first layer lock cylinder 3 and the end face of the second layer lock cylinder 4 located at one end of the keyhole 32. In this embodiment, the rotation of the second layer lock cylinder 4 can drive the bolt to rotate.

[0042] The working principle of this embodiment is as follows: After the sleeve 11 is pushed into the keyhole 32 to a set length, the push rod 12 is pushed, and the pin 15 presses down the pin 5, so that the interface of two adjacent pins 5 in the second pin hole 31 and the third pin hole 41 coincides with the interface of the first lock cylinder 3 and the second lock cylinder 4, so that the first lock cylinder 3 can rotate relative to the second lock cylinder 4. The rotation angle is reflected by the third scale. When the rotation reaches the set angle, the second pin hole 31 and the third pin hole 41 coincide with the first pin hole 21, and the pin 5 is blocked again on the interface of the first lock cylinder 3 and the second lock cylinder 4, so that the first lock cylinder 3 and the second lock cylinder 4 can rotate synchronously. Then the sleeve 11 is extended or withdrawn to a set length, and the above process is repeated, so that the first lock cylinder 3 and the second lock cylinder 4 rotate together relative to the lock body 2, thereby driving the bolt to rotate and realizing unlocking. It should be noted that the number of layers of the second lock cylinder 4 is not limited to one. When there are multiple layers of the second lock cylinder 4, the bolt is fixed on the lock cylinder closest to the lock body 2, and then the above process can be repeated to unlock.

[0043] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A pin tumbler lock with non-exposed pins, comprising a key, a lock body, a first-layer lock cylinder, pins, and a second spring, wherein the lock body has a plurality of first pin holes, the first-layer lock cylinder has a plurality of second pin holes, the second spring is located within the first pin holes, and a plurality of pins are located within the first and second pin holes, and the first-layer lock cylinder has a keyhole in the center, and the first-layer lock cylinder can rotate relative to the lock body after unlocking, characterized in that: The end face of the pin is parallel to the keyhole or located below the keyhole; The key includes a sleeve, a push rod, a spring plate, and a pin. One end of the spring plate is fixed to the inner wall of the sleeve, and the other end of the spring plate is raised with the pin fixed below it. A through hole is provided on the sleeve directly below the pin. When the spring plate is not compressed, the pin is located inside the sleeve. A boss is provided on the push rod, and the push rod is horizontally slidably connected to the sleeve. During the sliding of the push rod, the boss contacts the spring plate and presses the pin out of the through hole, thereby pressing down the tumbler.

2. The pin tumbler lock with non-exposed pins according to claim 1, characterized in that, It also includes at least one second lock cylinder, which is located between the lock body and the first lock cylinder. The second lock cylinder is provided with a plurality of third pin holes corresponding to the positions of the first pin holes and the second pin holes, and pins are provided in the third pin holes.

3. The pin tumbler lock with non-exposed pins according to claim 1 or 2, characterized in that, It also includes a return device for returning the push rod to its original position.

4. The pin tumbler lock with non-exposed pins according to claim 3, characterized in that, The return device includes a return cylinder and a first spring. The return cylinder is fixed to the bottom end of the sleeve. One end of the push rod is located inside the return cylinder. The first spring is fixed between one end of the push rod and the return cylinder and is in a compressed state.

5. The pin tumbler lock with non-exposed pins according to claim 3, characterized in that, The return device is a third spring, one end of which is fixed inside the sleeve and the other end is fixed on the push rod.

6. The pin tumbler lock with non-exposed pins according to claim 1 or 2, characterized in that, A first scale is provided on one end of the push rod located outside the sleeve.

7. The pin tumbler lock with non-exposed pins according to claim 1 or 2, characterized in that, The outer wall of the sleeve is provided with a second scale.

8. The pin tumbler lock with non-exposed pins according to claim 2, characterized in that, A third scale is provided on the first and second lock cylinder end faces located at one end of the keyhole.

9. The pin tumbler lock with non-exposed pins according to claim 1, characterized in that, It also includes a lock tongue, which can be rotated by the rotation of the first lock cylinder.

10. The pin tumbler lock with non-exposed pins according to claim 2, characterized in that, It also includes a bolt, and the rotation of the second-layer lock cylinder can drive the bolt to rotate.

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