GB2591154A

GB2591154A - Vandal-resistant self-locking door cylinder

Info

Publication number: GB2591154A
Application number: GB2007261.7A
Authority: GB
Inventors: Zeng Xiongfei; Yang Minghua; Pan Shaogang
Original assignee: Zhong Shan City Jixin Core Lock Co Ltd
Current assignee: Zhong Shan City Jixin Core Lock Co Ltd
Priority date: 2020-01-18
Filing date: 2020-05-15
Publication date: 2021-07-21
Anticipated expiration: 2040-05-15
Also published as: GB202007261D0; GB2591154B; CN111140085A

Abstract

A self-locking door cylinder having a lock shell 1 with an outer detent 6 and an inner detent 7 which link an outer rotor 3 to a cam 2. The inner detent has a transverse pin hole and a first longitudinal hole and the outer detent has a second longitudinal hole which are aligned. A pin member 9 is arranged on the outer rotor and enters the transverse pin hole to support the first limit member, so that the outer detent and inner detent are linked by a first limit member 8 in the longitudinal holes. When the lock shell is damaged or destroyed and the outer rotor and pin member are removed, the first limit member is unsupported by the plug portion and completely enters the first longitudinal hole. As the two detents are not linked, the inner detent idly rotates, and the outer detent cannot be driven. A spring may urge the first link member towards the inner detent. The linkage between the cam and the outer or inner rotor 4, can be switched by a key so if the door cylinder is broken, the inner half of the door cylinder remains functional.

Description

VANDAL-RESISTANT SELF-LOCKING DOOR CYLINDER

[0001] The present invention relates to locks, and more particularly, to a vandal-resistant self-locking door cylinder.

[0002] A double-cylinder lock is a lock that can be unlocked by inserting the key from both sides of the door. Current double-cylinder locks can be forcibly destroyed by intruders using tools outside the door, and then the lock shell thereof is easily broken at the open slot. Once broken, the cam or the rotating key connected to the cam is exposed to intruders who might rotate the rotating key or the cam by various tools to open the lock. This is a common way for burglars to enter a house by force. in this case, once the outer half of the door cylinder is broken by the intruder, users cannot open the door with the correct key inserting into the door cylinder on the other side of the door cylinder (i.e., the users inside the room cannot open the door) and save themselves, but have to seek help from a specialized locksmith, which causes the users much trouble and poses a potential risk to property and persons.

[0003] Tn the prior art, there have been some door cylinders with 1u-destruction structures. These door cylinders, however, have shortcomings such as low manufacturability, too many moving parts, and difficult installation. The present invention is directed to these shortcomings to improve the existing door cylinder.

[0004[ in order to solve the above-mentioned issues, the present invention provides a high-security vandal-resistuat self-locking door cylinder that can effectively protect against drilling and twisting.

[0003] The present invention provides the following technical solutions to achieve the above-mentioned objectives.

[0006] A vandal-resistant self-locking door cylinder includes a lock shell, a cam, an outer rotor and an inner rotor. the cam is installed in an open slot in the middle of the lock shell. The outer rotor and the inner rotor are respectively installed on two sides of the cam in the lock shell. The lock shell is further provided with an outer detent and an inner detent. The outer detent is arranged between the cam and the outer rotor and linked to the cam by a rotating key assembly. The inner detent can be linked to the outer detent or idly rotate relative to the outer detent. The outer rotor is linked to the inner detent. The inner detent is provided with a transverse pin hole arranged along a direction in which a key is inserted and a first longitudinal hole perpendicularly penetrating the transverse pin hole. 't he outer detent is provided with a second longitudinal hole connected to the first longitudinal hole. A first limit member is provided in the first longitudinal hole and the second longitudinal hole to allow a linkage between the inner detent and the outer detent.

A pin member is fixed on the outer rotor. The pin member has a plug portion configured to be inserted into the transverse pin hole and configured to support the first limit member. the lower end of the first limit member is supported by the plug portion to be rettined in the first longitudinal hole. The upper end of the first limit member is retained in the second longitudinal hole.

[0007J in normal use, the outer detent and the inner detent are linked by the first limit member. When the lock shell is destroyed and the first limit member is not supported by the plug portion, the vandal-resistant self-locking door cylinder enters a vandal-resistant self-locking state. When unsupported by the plug portion, the first limit member completely enters the first longitudinal hole to disconnect the linkage between the inner detent and the outer detent. the inner detent can only idly rotate relative to the outer detent.

[0008] Preferably, the lock shell is further provided with a locking assembly capable of locking the outer detent and the lock shell in the vandal-resistant self-locking state.

[0009] Preferably, the lock shell is provided with a third longitudinal hole coaxial with the second longitudinal hole. The locking assembly includes a steel ball and a limit flat member that are successively arranged in the third longitudinal hole from bottom to top.

The lower end of the steel ball abuts on the upper end surface of the first limit member, and the lower end surface of the limit flat member abuts on the upper end of the steel ball. \\Then the inner detent drives the outer detent to rotate, the steel ball rotates relative to the outer detent in the third longitudinal hole. When the vandal-resistant self-locking door cylinder enters the vandal-resistant self-locking state, the first limit member completely enters the first longitudinal hole, meanwhile, the steel ball enters the second longitudinal hole and abuts on the upper end surface of the first limit member, and the lower end of the limit flat member enters the second longitudinal hole to lock the outer detent and the lock shell. When the inner detent idly rotates relative to the outer detent, the steel ball rotates relative to the inner detent in the second longitudinal hole.

100101 Preferably, the side end surface of the inner detent is inwardly recessed to form an arc-shaped sliding groove located outside the first longitudinal hole. When entering the vandal-resistant self-locking state, the lower end of the steel ball passes through the second longitudinal hole into the arc-shaped sliding groove and abuts on the upper end surface of the first limit member.

10011] Preferably, the outer detent is further provided with a fourth longitudinal hole located at the lower end of the inner detent and coaxial with the second longitudinal hole. A second limit member is provided in the fourth longitudinal hole. The upper end of the second limit member extends into the arc-shaped sliding groove and abuts on the side end surface of the inner detent.

10012] Preferably, at least one upper stop chamber located outside the third longitudinal hole is provided in the lock shell. The locking assembly further includes an upper stop pin and an upper stop spring provided in the upper stop chamber. the bottom of the upper stop chamber is provided with an upper stop hole connected to the third longitudinal hole. One end of the upper stop pin protrudes outward to form all insertion portion that can be inserted into the third longitudinal hole through the upper stop hole under the action of the upper stop spring. When not entering the vandal-resistant self-locking state, the front end of the insertion portion passes through the upper stop hole and abuts on the side end surface or the limit Hat member. When entering the vandal-resistant self-locking state, after the limit flat member falls, the insertion portion is inserted into the third longitudinal hole through the upper stop hole and is located at the upper end of the limit flat member.

[0013] Preferably, the lock shell is further provided with a sealing plate that covers the outside of the upper stop chamber.

[0014] Preferably, the locking assembly further includes a self-locking spring, wherein the self-locking spring is arruiged in the third longitudinal hole and capable of pushing the limit fiat member to move downward.

100151 Preferably, one end of the outer detent is provided with a rotating chamber, wherein the rotating chamber has an opening facing the outer rotor and is used for accommodating the inner detent, and the other end of the outer detent is connected to the rotating key assembly. When entering the vandal-resistant self-locking state, the inner detent idly rotates in the rotating chamber. A side of the outer rotor facing the inner detent is provided with a first slot. A side of the inner detent facing the outer rotor is provided with a first inserting key engaged with the first slot. A side of the outer rotor facing the inner detent is further provided with a pin member chamber and a second slot. The pin member chamber is used for accommodating the pin member, and the second slot is located on both sides of the pin member chamber and penetrates the pin member chamber. 't he pin member has a second inserting key inserted into the second slot. 10016] Preferably, a first retainer notch is provided on the outer side of the outer rotor, and the first retainer notch is located between the first slot and the second slot and connected to the first slot and the second slot. A second retainer notch corresponding to the first retainer notch is provided on the second inserting key. the first retainer notch and the second retainer notch form an arc-shaped retainer slot, and the retainer slot is provided with a retainer used for axially fixing the outer rotor and the pin member.

[0017] Preferably, the rotating key assembly is mainly composed of an outer rotating key and an inner rotating key hinged to the outer rotating key The side of the outer detent facing the cam is provided with an outer rotating key chamber and a third slot. The outer rotating key chamber is used for accommodating the outer rotating key. The third slot is located on both sides of the outer rotating key chamber and connected to the outer rotating key chamber. 't he outer rotating key is provided with a third inserting key engaged with the third slot. 't he cam is provided with a linkage hole fitted with the rotating key assembly. When the outer detent is linked to the cam, one end of the outer rotating key is located in the outer detent, and the other end of the outer rotating key is located in the linkage hole. The inner rotor is linked to the cam through the inner rotating key. The inner rotor is provided with an inner rotating key chamber and a fourth slot. The inner rotating key chamber is used for accommodating the inner rotating key The fourth slot is located on both sides of the inner rotating key chamber and connected to the inner rotating key chamber. 't he inner rotating key is provided with a fourth inserting key engaged with the fourth slot. the rotating key assembly further includes a rotating key spring. A spring chamber used for accommodating the rotating key spring is provided at an end of the outer rotating key facing the inner detent One end of the rotating key spring abuts on the side end of the inner detent, and the other end of the rotating key spring abuts on the bottom of the spring chamber. After the key is inserted into the inner rotor, the front end of the key pushes the outer rotating key and the inner rotating key to move toward the inner detent, so as to compress the rotating key spring. Meanwhile, the outer rotating key exits from the linkage hole, and one end of the inner rotating key is inserted into the linkage hole so that the inner rotor and the cam are linked. When the key is pulled out from the inner rotor, the rotating key spring drives the outer rotating key and the inner rotating key to reset.

[0018] The advantages of the present invention are as follows: [0019] 1. In the present invention, the lock shell is provided with the outer detent and the inner detent that are configured to realize the linkage between the cam and the outer rotor. The inner detent is provided with the transverse pin hole and the first longitudinal hole, and the outer detent is provided with the second longitudinal hole. The pin member is fixed on the outer rotor and has a plug portion that can be inserted into the transverse pin hole, so that the outer detent and the inner detent are linked by the first limit member.

When the lock shell is broken and the outer rotor and the pin member are removed, the first limit member completely enters the first longitudinal hole so that the inner detent can idly rottte relative to the outer detent to enter the vandal-resistant self-locking state, and the outer detent and the lock shell are locked by the locking assembly. Once done, the inner detent idly rotates, and the miler detent cannot be driven, which can effectively protect the lock against drilling and twisting. In this way, intruders cannot forcibly open the door by rotating the cam with a tool, which effectively frustrates unauthorized entry. [0020] 2. the linkages between the cam and the outer rotor, and between the cam and the inner rotor are switched by the rotating key assembly, which ensures that after the first half of the door cylinder is broken by intruders, the second half of the door cylinder can still function normally to secure a door.

[0021] FIG. 1 is a structural schematic diagram of the present invention; [0022] FIG. 2 is a cross-sectional view showing the portion A-A in FIG. I; [0023] FIG. 3 is a cross-sectional structural view showing the present invention; [0024] FIG. 4 is a cross-sectional structural view showing the present invention in the vandal-resistant self-locking state; [0025] FIG. 5 is a vertical-sectional structural -view showing the present invention in the vandal-resistant self-locking state; [0026] FIG. 6 is an exploded view of the present invention; [0027] FIG. 7 is a structural schematic diagram of the cam; [0028] FIG. 8 is a structural schematic diagram of the outer rotor; [0029] FIG. 9 is a structural schematic diagram of the inner rotor; [0030] FIG. 10 is a structural schematic diagram of the rotating key assembly; [0031] FTG. 11 is an exploded view of the rotating key assembly; [0032] FIG. 12 is a structural schematic diagram showing a first embodiment of the outer detent; [0033] FIG. 13 is a structural schematic diagram showing a second embodiment of the outer detent [0034] FIG. 14 is a structural schematic diagram of the inner detent; and [0035] FIG. 15 is a structural schematic diagram of the pin member.

[0036] Hereinafter, the present invention is further described in detail with reference to the drawings and embodiments.

[0037] As shown in FIGS. 1-6, a vandal-resistant self-locking door cylinder includes the lock shell 1, the cam 2, the outer rotor 3 and the inner rotor 4. The cam 2 is installed in an open slot in the middle of the lock shell I. The outer rotor 3 and the inner rotor 4 are respectively installed on two sides of the cam 2 in the lock shell 1. the lock shell 1 is further provided with the outer detent 6 and the inner detent 7. "k he outer detent 6 is arranged between the cam 2 and the outer rotor 3 and linked to the cam 2 by the rotating key assembly 5. The inner detent 7 can be linked to the outer detent 6 or idly rotate relative to the outer detent 6. The outer rotor 3 is linked to the inner detent 7. The inner detent is provided with the transverse pin hole 71 arranged along a direction in which a key is inserted and the first longitudinal hole 72 perpendicularly penetrating the transverse pin hole 71. The outer detent 6 is provided with the second longitudinal hole 61 connected to the first longitudinal hole 72. the first limit member 8 is provided in the first longitudinal hole 72 and the second longitudinal hole 62 to allow a linkage between the inner detent 7 and the outer detent 6.

[0038] The pin member 9 is fixed on the outer rotor 3. The pin member 9 has the plug portion 91 that can be inserted into the transverse pin hole 71 and configured to support the first limit member 8. The lower end of the first limit member 8 is retained in the first longitudinal hole 72 by the support of the plug portion 91. The upper end of the first limit member 8 is retained in the second longitudinal hole 61. Tn normal use, the outer detent 6 and the inner detent 7 are linked by the first limit member 8. As shown in FIG. 4 and FTG. 5, when the lock shell 1 is destroyed (namely, the lock shell 1 is broken, the outer rotor 3 and the pin member 9 may be easily removed) and the first limit member 8 is unsupported by the plug portion 91, the vandal-resistant self-locking door cylinder assumes a vandal-resistant self-locking state. Once unsupported by the plug portion 91, the first limit member 8 completely enters the first longitudinal hole 72 to disconnect the linkage between the inner detent 7 and the outer detent 6. The inner detent 7 can only idly rotate relative to the outer detent 6. in addition, the lock shell 1 is Further provided with the locking assembly 10 capable of locking the outer detent 6 and the lock shell 1 in the vandal-resistant self-locking state. At this time, the inner detent idly rotates, and the outer detent cannot be driven, which can effectively protect the lock against drilling and twisting. In this way, intruders cannot forcibly open the door by rotating the cam with a tool, which means the interior is kept secure.

100391 Further, the lock shell I is provided with the third longitudinal hole 11 coaxial with the second longitudinal hole 61.'1' he locking assembly 10 includes the steel ball 101 and the limit flat member 102 that are successively arranged in the third longitudinal hole 11 from bottom to top. The lower end of the steel ball 101 abuts on the upper end surface of the first limit member 8, and the lower end surface of the limit Hat member 102 abuts on the upper end of the steel ball 101. When the inner detent 7 drives the outer detent 6 to rotate, the steel ball 101 rotates relative to the outer detent 6 in the third longitudinal hole 11. When the vandal-resistant self-locking door cylinder enters the vandal-resistant self-locking state, the first limit member 8 completely enters the first longitudinal hole 72, meanwhile, the steel ball 101 enters the second longitudinal hole 61 and abuts on the upper end surface of the first limit member 8, and the lower end of the limit flat member 102 enters the second longitudinal hole 61 to lock the outer detent 6 and the lock shell I. When the inner detent 7 idly rotates relative to the outer detent 6, the steel ball 101 rotates relative to the inner detent 7 in the second longitudinal hole 61.

[0040] Tn the present embodiment, in order to further improve the smoothness of the movement between the components to prevent the lock from being jammed, the side end surface of the inner detent 7 is inward recessed to form an arc-shaped sliding groove 73 located outside the first longitudinal hole 72. When entering the vandal-resistant self-locking state, the lower end of the steel ball 101 passes through the second longitudinal hole 61 into the arc-shaped sliding groove 73 and abuts on the upper end surface of the first limit member 8. The arc-shaped sliding groove 73 has a larger rotating space for the steel ball 101 to effectively prevent jamming the outer detent 6 and the inner detent 7 and ensure the smoothness of the relative rotation between the outer detent 6 and the inner detent 7. in addition, since the upper end of the steel ball 101 is located in the second longitudinal hole 61, and the lower end of the steel ball 101 is located in the arc-shaped sliding groove 73, so that the inner detent 7 cannot be pulled out in the direction in which the key is pulled out, and the inner detent 7 can only idly rotate relative to the outer detent 6.

[0041] In the present embodiment, the outer detent 6 is further provided with the fourth longitudinal hole 65 located at the lower end of the inner detent 7 and coaxial with the second longitudinal hole 61. The second limit member 66 is provided in the fourth longitudinal hole 65. The upper end of the second limit member 66 extends into the arc-shaped sliding groove 73 and abuts on the side end surface of the inner detent 7. the second limit member 66 functions to axially limit the inner detent 7 to keep the first longitudinal hole 72, the second longitudinal hole 61 and the third longitudinal hole 11 coaxial, which can improve the smoothness of the movement between the components and prevent the lock from being jammed.

[0042] In the present embodiment, in order to prevent the first limit member 8, the steel ball 101 and the limit flat member 102 From being picked by intruders and moving upward, at least one upper stop chamber 12 located outside the third longitudinal hole 11 is provided in the lock shell 1, as shown in FTG. 2, there are two upper stop chambers 12 symmetrically distributed on both sides of the third longitudinal hole 11. The locking assembly 10 Further includes two upper stop pins 103 and two upper stop springs 104 provided in the upper stop chamber 12. The bottom of the upper stop chamber 12 is provided with the upper stop hole 13 connected to the third longitudinal hole 11. One end of the upper stop pin 103 protrudes outward to form the insertion portion 1031 that can be inserted into the third longitudinal hole 11 through the upper stop hole 13 under the action of the upper stop spring 104.

[0043] When not entering the vandal-resistant self-locking state, the front end of the insertion portion 1031 passes through the upper stop hole 13 and abuts on the side end surface of the limit flat member 102. When entering the vandal-resistant self-locking state, after the limit flat member 102 tails, the insertion portion 1031 is inserted into the third longitudinal hole 11 through the upper stop hole 13 and is located at the upper end of the limit flat member 102 to prevent the limit flat member 102 from moving upward, so that the intruders cannot open the lock by force, thereby keeping the users safe. In order to ensure that when entering the vandal-resistant self-locking state, the first limit member 8, the steel ball 101 and the limit flat member 102 can smoothly move downward, the locking assembly 10 further includes the self-locking spring 106 arranged in the third longitudinal hole 11 and capable of pushing the limit Flat member 102 to move downward.

In normal use, the plug portion 91 is inserted into the transverse pin hole 71 to allow a part of the first limit member 8 to remain in the first longitudinal hole 72 and the remaining part of the first limit member 8 to remain in the second longitudinal hole 61, and to support the steel ball 101 and the limit flat member 102 and compress the self-locking spring 106.

[0044] In the present embodiment, the lock shell 1 is further provided with the sealing plate 105 that covers the outside of the upper stop chamber 12. Furthermore, the lock shell 1 is provided with the sealing plate slot 107 and the sealing plate 105 is laterally inserted into the sealing plate slot 107. The sealing plate slot 107 has a narrow outer portion and a wide inner portion to prevent the sealing plate 105 from falling off [0045] Tn the present embodiment, as shown in FIGS. 12-14, one end of the outer detent 6 is provided with the rotating chamber 62 that has an opening facing the outer rotor 3 and is used for accommodating the inner detent 7, and the other end of the outer detent 6 is connected to the rotating key assembly 5. When entering the vandal-resistant self-locking state, the inner detent 7 idly rotates in the rotating chamber 62. As shown in FIG. 8, the side of the outer rotor 3 facing the inner detent 7 is provided with the first slot 31. The side of the inner detent 7 Facing the outer rotor 3 is provided with the First inserting key 74 engaged with the first slot 31. The side of the outer rotor 3 facing the inner detent 7 is further provided with the pin member chamber 33 and the second slot 32. 't he pin member chamber 33 is used for accommodating the pin member 9, and the second slot 32 is located on both sides of the pin member chamber 33 and penetrates the pin member chamber 33. As shown in FIG. 15, the pin member 9 has the second inserting key 92 inserted into the second slot 32, and the second slot 32 is engaged with the second inserting key 92 to achieve the linkage between the pin member 9 and the outer rotor 3, which has a few parts and is easy to manufacture.

[0046] In the present embodiment, the first retainer notch 34 is provided on the outer side of the outer rotor 3. The First retainer notch 34 is located between the first slot 31 and the second slot 32 and connected to the first slot 31 and the second slot 32. the second retainer notch 93 corresponding to the first rettiner notch 34 is provided on the second inserting key 92.'1' he first retainer notch 34 and the second retainer notch 93 form an arc-shaped retainer slot, and the retainer slot is provided with a retainer used for axially fixing the outer rotor 3 and the pin member 9. The outer rotor 3 and the pin member 9 are axially fixed by the retainer. When the first half of the lock shell 1 is broken by the intruder, the pin member 9 can be taken out while the outer rotor 3 is taken out, thereby entering the vandal-resistant self-locking state.

[0047] As shown in FIG. 10 and FIG. 11, the rotating key assembly 5 is mainly composed of the outer rotating key 51 and the inner rotating key 52 hinged to the outer rotating key 51. The outer rotating key 51 and the inner rotating key 52 can be hinged by a hinge shaft in the prior art. The side of the outer detent 6 facing the cam 2 is provided with the outer rotating key chamber 64 and the third slot 63. The outer rotating key chamber 64 is used for accommodating the outer rotating key 51. The third slot 63 is located on both sides of the outer rotating key chamber 64 and connected to the outer rotating key chamber 64. The outer rotating key 51 is provided with the third inserting key 53 engaged with the third slot 63.

[0048] As shown in FIG. 7, the cam 2 is provided with the linkage hole 21 fitted with the rotating key assembly 5. When the outer detent 6 is linked to the cam 2, one end of the outer rotating key 51 is located in the outer detent 6, and the other end of the outer rotating key 51 is located in the linkage hole 21. 't he inner rotor 4 is linked to the cam 2 through the inner rotating key 52. As shown in FIG. 9, the inner rotor 4 is provided with the inner rotating key chamber 42 and the fourth slot 41. 't he inner rotating key chamber 42 is used for accommodating the inner rotating key 52. The fourth slot 41 is located on both sides of the inner rotating key chamber 42 and connected to the inner rotating key chamber 42. The inner rotating key 52 is provided with the fourth inserting key 54 engaged with the fourth slot 41. The rotating key assembly 5 further includes the rotating key spring 55. The spring chamber 56 used for accommodating the rotating key spring 55 is provided at the end of the outer rotating key 51 facing the inner detent 7. One end of the rotating key spring 55 abuts on the side end of the inner detent 7, and the other end of the rotating key spring 55 abuts on the bottom of the spring chamber 56. After the key is inserted into the inner rotor 4, the front end of the key pushes the outer rotating key 51 and the inner rotating key 52 to move toward the inner detent 7 to compress the rotating key spring 55. Meanwhile, the outer rotating key 51 exits from the linkage hole 21, and one end of the inner rotating key 52 is inserted into the linkage hole 21 so that the inner rotor 4 and the cam 2 are linked. When the key is pulled out From the inner rotor 4, the rotating key spring 55 drives the outer rotating key 51 and the inner rotating key 52 to reset. The link/ages between the cam 2 and the outer rotor 3, and between the cam 2 and the inner rotor 4 are switched by the rotating key assembly 5, which ensures that after the first half of the door cylinder is broken by intruders, the second half of the door cylinder remains functioning to maintain security. 11:3

Claims

CLAIMS1. A vandal-resistant self-locking door cylinder, comprising a lock shell (1), a cam (7), an outer rotor (3) and an inner rotor (4); characterized in that, the cam (2) is installed in an open slot at a middle of the lock shell (1); the outer rotor (3) and the inner rotor (4) are respectively installed on two sides of the cam (2) in the lock shell (1); the lock shell (1) is further provided with an outer detent (6) and an inner detent (7); the outer detent (6) is arranged between the cam (2) and the outer rotor (3) and linked to the cam (2) by a rotating key assembly (5); the inner detent (7) can be linked to the outer detent (6) or idly rotate relative to the outer detent (6); the outer rotor (3) is linked to the inner detent (7); the inner detent (7) is provided with a transverse pin hole (71) arranged along a direction in which a key is inserted and a first longitudinal hole (72) perpendicularly penetrating the transverse pin hole (71); the outer detent (6) is provided with a second longitudinal hole (61) connected to the first longitudinal hole (72); a first limit member (8) is provided in the first longitudinal hole (72) and the second longitudinal hole (61) to allow a linkage between the inner detent (7) and the outer detent (6); a pin member (9) is fixed on the outer rotor (3); the pin member (9) is provided with a plug portion (91), and the plug portion is configured to be inserted into the transverse pin hole (71) and configured to support the first limit member (8); a lower end of the first limit member (8) is supported by the plug portion (91) to be retained in the first longitudinal hole (72); an upper end of the first limit member (8) is retained in the second longitudinal hole (61); in normal use, the outer detent (6) and the inner detent (7) are linked by the first limit member (8); when the lock shell (1) is destroyed and the first limit member (8) is not supported by the plug portion (91), the vandal-resistant self-locking door cylinder enters a vandal-resistant self-locking state; after the first limit member is not supported by the plug portion (91), the first limit member (8) completely enters the first longitudinal hole (72) to disconnect the linkage between the inner detent (7) and the outer detent (6); the inner detent (7) can only idly rotate relative to the outer detent (6).
2. The vandal-resistant self-locking door cylinder according to claim 1, characterized in that, the lock shell (1) is further provided with a locking assembly (10) capable of locking the outer detent (6) and the lock shell (1) in the vandal-resistant self-locking state. 5
3. The vandal-resistant self-locking door cylinder according to claim 2, characterized in that, the lock shell (1) is provided with a third longitudinal hole (11) coaxial with the second longitudinal hole (61); the locking assembly (10) comprises a steel ball (101) and a limit flat member (102) that are successively arranged in the third longitudinal hole (11) from bottom to top; a lower end of the steel ball (101) abuts on an upper end surface of the first limit member (8), and a lower end surface of the limit flat member (102) abuts on an upper end of the steel ball (101); when the inner detent (7) drives the outer detent (6) to rotate, the steel ball (101) rotates relative to the outer detent (6) in the third longitudinal hole (11); when the vandal-resistant self-locking door cylinder enters the vandal-resistant self-locking state, the first limit member (8) completely enters the first longitudinal hole (72), meanwhile, the steel ball (101) enters the second longitudinal hole (61) and abuts on the upper end surface of the first limit member (8), and the lower end of the limit flat member (102) enters the second longitudinal hole (61) to lock the outer detent (6) and the lock shell (1); when the inner detent (7) idly rotates relative to the outer detent (6), the steel ball (101) rotates relative to the inner detent (7) in the second longitudinal hole (61).
4. The vandal-resistant self-locking door cylinder according to claim 3, characterized in that, a side end surface of the inner detent (7) is inward recessed to form an arc-shaped sliding groove (73) located outside the first longitudinal hole (72); when entering the vandal-resistant self-locking state, the lower end of the steel ball (101) passes through the second longitudinal hole (61) into the arc-shaped sliding groove (73) and abuts on the upper end surface of the first limit member (8).
5. The vandal-resistant self-locking door cylinder according to claim 4, characterized in that, the outer detent (6) is Further provided with a Fourth longitudinal hole (65) located at the lower end of the inner detent (7) and coaxial with the second longitudinal hole (61); a second limit member (66) is provided in the fourth longitudinal hole (65); an upper end of the second limit member (66) extends into the arc-shaped sliding groove (73) and abuts on the side end surface of the inner detent (7).
6. The vandal-resistant self-locking door cylinder according to claim 3, characterized in that, at least one upper stop chamber (12) located outside the third longitudinal hole (11) is provided in the lock shell (1); the locking assembly further (10) comprises an upper stop pin (103) and an upper stop spring (104) provided in the upper stop chamber (12); the bottom of the upper stop chamber (12) is provided with an upper stop hole (13) connected to the third longitudinal hole (11); one end of the upper stop pin (103) protrudes outward to form an insertion portion (1031), and the insertion portion is configured to be inserted into the third longitudinal hole (11) through the upper stop hole (13) under an action of the upper stop spring (104); when not entering the vandal-resistant self-locking state, a front end of the insertion portion (1031) passes through the upper stop hole (13) and abuts on the side end surface of the limit flat member (102); when entering the vandal-resistant self-locking state, after the limit flat member (102) falls, the insertion portion (1031) is inserted into the third longitudinal hole (11) through the upper stop hole (13) and is located at the upper end of the limit flat member (102).
7. The vandal-resistant self-locking door cylinder according to claim 6, characterized in that, the lock shell (1) is further provided with a sealing plate (105) and the sealing plate covers outside of the upper stop chamber (12).
8. The vandal-resistant self-locking door cylinder according to claim 6, characterized in that, the locking assembly (10) further comprises a self-locking spring (106), and the self-locking spring is arranged in the third longitudinal hole (11) and capable of pushing the limit flat member (102) to move downward.
9. the vandal-resistant self-locking door cylinder according to any one of claims 1-8, characterized in that, one end of the outer detent (6) is provided with a rotating chamber (62), and the rotating chamber is provided with an opening facing the outer rotor (3) and is used for accommodating the inner detent (7), and the other end of the outer detent (6) is connected to the rotating key assembly (3); when entering the vandal-resistant self-locking state, the inner detent (7) idly rotates in the rotating chamber (62); a side of the outer rotor (3) facing the inner detent (7) is provided with a first slot (31); a side of the inner detent (7) facing the outer rotor (3) is provided with a first inserting key (74) engaged with the first slot (31); a side of the outer rotor (3) facing the inner detent (7) is further provided with a pin member chamber (33) and a second slot (32); the pin member chamber (33) is used for accommodating the pin member (9), and the second slot (32) is located on both sides of the pin member chamber (33) and penetrates the pin member chamber (33); the pin member (9) has a second inserting key (92) inserted into the second slot (32).
10. the vandal-resistant self-locking door cylinder according to claim 9, characterized in that, a first retainer notch (34) is provided on the outer side of the outer rotor (3), and the first retainer notch (34) is located between the first slot (31) and the second slot (32) and connected to the first slot (31) and the second slot (32); a second retainer notch (93) corresponding to the first retainer notch (34) is provided on the second inserting key (92); the firs t retainer notch (34) and the second retainer notch (93) form an arc-shaped retainer slot, and the retainer slot is provided with a retainer used for axially fixing the outer rotor (3) and the pin member (9).
11. The vandal-resistant self-locking door cylinder according to claim 9, characterized iii that, the rotating key assembly (5) comprises an outer rotating key (Si) and an inner rotating key (52) hinged to the outer rotating key (51); a side of the outer detent (6) facing the cam (2) is provided with an outer rotating key chamber (64) and a third slot (63); the outer rotating key chamber (64) is used for accommodating the outer rotating key (51); the third slot (63) is located on both sides of the outer rotating key chamber (64) and connected to the outer rotating key chamber (64); the outer rotating key (51) is provided with a third inserting key (53) engaged with the third slot (63); the cam (2) is provided with a linkage hole (21) Fitted with the rotating key assembly (5); when the outer detent (6) is linked to the cam (2), one end of the outer rotating key (51) is located in the outer detent (6), and the other end of the outer rotating key (51) is located in the linkage hole (21); the inner rotor (4) is linked to the cam (2) through the inner rotating key (52); the inner rotor (4) is provided with an inner rotating key chamber (42) and a fourth slot (41); the inner rotating key chamber (42) is used for accommodating the inner rotating key (52); the fourth slot (41) is located on both sides of the inner rotating key chamber (42) and connected to the inner rotating key chamber (42); the inner rotating key (52) is provided with a Fourth inserting key (54) engaged with the Fourth slot (41); the rotating key assembly (5) further comprises a rotating key spring (55); a spring chamber (56) used for accommodating the rotating key spring (55) is provided at an end of the outer rotating key (51) facing the inner detent (7); one end of the rotating key spring (55) abuts on a side end of the inner detent (7), and the other end of the rotating key spring (55) abuts on a bottom of the spring chamber (56); after the key is inserted into the inner rotor (4), a front end of the key pushes the outer rotating key (51) and the inner rotating key (52) to move toward the inner detent (7) to compress the rotating key spring (55), meanwhile, the outer rotating key (51) exits from the linkage hole (21), and one end of the inner rotating key (52) is inserted into the linkage hole (21) so that the inner rotor (4) and the cam (2) arc linked; when the key is pulled out from the inner rotor (4), the rotating key spring (55) drives the outer rotating key (51) and the inner rotating key (52) to reset.