Mechanical lock capable of being unlocked in emergency

Abstract

The mechanical lock comprises a lock shell, a lock sleeve, a lock cylinder, a lock tongue, a lock bolt, a key, an emergency key, a limiting groove, a locking groove, a restraining groove and a limiting block, a pair of hollow blades are installed at the inner end of the lock cylinder in a floating mode and correspond to the locking groove and the restraining groove respectively, and the key and the emergency key are each provided with a protruding block. The protruding block on the key is located at the front position of the rear end of the key, the protruding block on the emergency key is located at the rear position of the rear end of the emergency key, and after the key / the emergency key is inserted into the lock cylinder, the corresponding protruding blocks jack up the inner side blades / the double-side blades, so that the inner side blades are separated from the locking grooves / the double-side blades are separated from the locking grooves and the restraining grooves respectively. The central angle of the limiting groove is larger than that of the restraining groove. Through the innovative structure of the lock cylinder, the lock tongue can be withdrawn only by rotating the key, the lock tongue can be withdrawn by rotating the emergency key, and the coded lock can be assisted in unlocking the lock bolt in emergency, so that the safe box only needs to be provided with a mechanical lock and the coded lock, and the manufacturing cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of locks, and in particular to a mechanical lock capable of being unlocked in an emergency. Background Art

[0002] Generally, safes and safe deposit boxes include double insurance of password locks and mechanical locks. The door can only be opened if the password locks and mechanical locks are unlocked at the same time.

[0003] For example, a Chinese utility model with publication number CN221546659U discloses a master-slave lock, in which a master-slave key and a sub-key are provided. The sub-key can be used to unlock the lock once in an emergency, which improves its flexibility. The sub-key cannot be reversed, which improves the transparency of the sub-key usage. At the same time, the overall security is improved by unlocking the lock with a combination key. However, such a structure still has the following significant defects:

[0004] 1. Mechanical locks are mechanical structures and are generally not prone to failure. However, password locks have circuit parts and are prone to problems. In order to prevent the door from being unable to be opened due to a password lock failure, an emergency mechanical lock is generally provided to assist the password lock in emergency opening. Therefore, a safe or safe cabinet needs to be equipped with two mechanical locks and one password lock, which has a high overall cost.

[0005] 2. When the lock core is subjected to strong twisting, the locking parts inside the lock are easily damaged due to the lack of effective anti-twist protection structure inside;

[0006] 3. When locking, the user needs to turn the key in the opposite direction to extend the lock tongue. If the user forgets to turn it or does not turn it fully and directly pulls out the key, the lock tongue will not be fully extended, posing a major safety hazard. Summary of the invention

[0007] The present invention aims to solve one of the technical problems existing in the prior art.

[0008] The present application provides a mechanical lock capable of emergency unlocking, comprising a lock shell, a lock sleeve, a lock core, a lock tongue, a lock bolt, a key and an emergency key, characterized in that a limiting groove and a locking groove are provided on the inner side of the inner end of the lock sleeve, a restraining groove is provided on the outer side of the inner end, a limiting block slidably matched with the limiting groove is provided on the peripheral wall of the inner end of the lock core, and a pair of hollow blades are also floatingly installed at the inner end of the lock core, and the pair of blades correspond to the locking groove and the restraining groove respectively, and the key and the emergency key are both provided with convex blocks, the convex block on the key is located at the front of the rear end of the key, and the convex block on the emergency key is located at the rear of the rear end of the emergency key, and after the key / emergency key is inserted into the lock core, the corresponding convex block lifts the inner blade / double-side blades to make the inner blade disengage from the locking groove / double-side blades disengage from the locking groove and the restraining groove respectively, and the lock tongue can be retracted by rotating the lock core / the lock tongue is retracted first and then the lock bolt is pushed to slide;

[0009] Among them, the center angle of the limiting groove is greater than the center angle of the constraint groove.

[0010] Furthermore, a disc is rotatably installed in the lock housing, a square groove is provided on the disc, a square block inserted in the square groove is provided at the bottom of the lock core, a sliding block is slidably installed in the lock housing, a straight groove perpendicular to the sliding direction of the sliding block is provided on the sliding block, and an eccentric cylinder slidably matched with the straight groove is provided at the bottom of the disc;

[0011] The rotation of the lock core drives the disc to rotate, and the eccentric cylinder pushes the sliding block to slide, so that the lock tongue fixed on the sliding block is retracted.

[0012] Furthermore, the sliding block is provided with an arc groove, one end of which is connected with one end of the straight groove close to the locking bolt, and the eccentric cylinder is slidably matched with the arc groove;

[0013] Wherein, after the locking tongue is fully retracted, the eccentric cylinder is located in the arc groove, so that the rotation of the disc will no longer push the sliding block to slide.

[0014] Furthermore, a slider is slidably installed in the lock housing, a first partial gear is arranged at one end of the slider facing the lock core, a lock bolt is fixed at the other end, and a second partial gear is arranged on the circumferential wall of the disc;

[0015] Among them, after the lock tongue is fully retracted, the first partial gear is meshed and connected with the second partial gear, and the rotation of the lock core can push the lock bolt to slide.

[0016] Further, a pair of symmetrical anti-torsion blocks are installed in a floating manner at the inner end of the lock core, a pair of slots are provided at the inner end of the lock sleeve, and the pair of anti-torsion blocks respectively correspond to the pair of slots, and two groups of locking pieces are installed in a floating manner at the inner end of the lock core, each group of locking pieces includes four locking blocks, and a pair of anti-torsion blocks respectively correspond to the two groups of locking pieces and press against the corresponding locking blocks;

[0017] Among them, the locking block is provided with a V-shaped groove at one end facing the anti-torsion block, and a pushing block is provided at the other end. The key and the emergency key are both provided with locking teeth. After the key and the emergency key are inserted into the lock cylinder, the locking teeth thereon can push the pushing block so that the V-shaped grooves on each group of the locking parts are aligned, and a pair of the anti-torsion blocks can slide into the corresponding V-shaped grooves and disengage from the corresponding slots.

[0018] Furthermore, four connecting ears distributed at equal intervals are fixedly connected to the side wall of the upper end of the lock sleeve, and a pair of non-adjacent connecting ears can be optionally installed in the lock housing by screws.

[0019] Furthermore, a pair of symmetrical arc blocks are fixedly mounted on the inner peripheral wall of the lock core, and a slide groove is provided on the arc block, and the radial distances of various parts of the slide groove to the axis of the lock core are different;

[0020] Wherein, a rotation groove is arranged on the inner side of the inner end of the locking sleeve, a pair of arc blocks are slidably installed in the rotation groove, a pair of driving members are arranged in the locking sleeve, and the pair of driving members can drive the corresponding arc blocks to rotate.

[0021] Furthermore, the driving members include a reset groove, a reset block, a reset cylinder and a reset spring. The reset groove is arranged in the lock sleeve and is connected to the rotation groove. The reset block is slidably installed in the reset groove. One end of the reset spring is pressed and fixed on the lock sleeve, and the other end is pressed and fixed on the reset block. A reset cylinder is arranged on the top of the reset block, and the reset cylinder is slidably installed in the slide groove.

[0022] The beneficial effects of the present invention are as follows:

[0023] 1. Through the arrangement of the limit slot, the locking slot, the restraint slot, a pair of blades and the limit block, the rotation of the key can only drive the lock tongue to be retracted. The rotation of the emergency key can not only retract the lock tongue, but also assist the combination lock to realize the emergency unlocking of the lock bolt, so that the safe only needs to be equipped with a mechanical lock and a combination lock, thereby reducing its manufacturing cost;

[0024] 2. By setting the anti-torsion block, when the lock core is subjected to strong torque, the anti-torsion block will not damage the locking block with weaker strength. The torque generated by the strong torsion is borne by the lock sleeve, the lock core and the anti-torsion block, thereby achieving the purpose of improving the torsional strength;

[0025] 3. The arc block, the slide groove and the drive member can be used to push the lock core to rotate, which prevents the user from forgetting to turn the lock core or pulling out the key or emergency key directly when closing the safe, thereby ensuring the safety protection performance of the safe. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of the structure of a mechanical lock capable of emergency unlocking in an embodiment of the present application;

[0027] Figure 2 This is a schematic diagram of the structure when a key is inserted into a lock cylinder in an embodiment of the present application;

[0028] Figure 3 for Figure 2 Schematic diagram of the cross-sectional structure along the AA direction;

[0029] Figure 4 for Figure 2 Schematic diagram of the cross-sectional structure along the BB direction;

[0030] Figure 5 for Figure 1 Schematic diagram of the cross-sectional structure along the EE direction;

[0031] Figure 6 This is a schematic diagram of the structure of the lock core in the embodiment of the present application;

[0032] Figure 7 It is a schematic diagram of the structure of the disc, the slider, the lock bolt, the lock tongue, the sliding block, the first partial gear and the second partial gear in the embodiment of the present application;

[0033] Figure 8 This is a schematic diagram of the structure of the key and the emergency key in the embodiment of the present application;

[0034] Fig. 9 for Figure 2 Schematic diagram of the cross-sectional structure along the CC direction;

[0035] Fig.10 This is a schematic diagram of the structure of the anti-torsion block and the locking member in the embodiment of the present application;

[0036] Fig.11 for Figure 2 Schematic diagram of the cross-sectional structure along the DD direction;

[0037] Fig.12 for Fig.11 Schematic diagram of the enlarged structure at F in the middle.

[0038] Reference numerals

[0039] 1-lock housing, 2-lock sleeve, 21-limiting groove, 22-locking groove, 23-constraining groove, 24-card slot, 25-connecting ear, 3-lock core, 31-limiting block, 32-blade, 33-square block, 34-anti-torsion block, 35-locking piece, 351-locking block, 352-V-groove, 353-pushing block, 4-lock tongue, 5-lock bolt, 6-key, 7-emergency key, 8-bump, 9-disc, 91-square groove, 92-eccentric cylinder, 93-partial gear No. 2, 10-sliding block, 101-straight groove, 102-arc groove, 11-sliding block, 111-partial gear No. 1, 12-locking tooth, 13-arc block, 14-sliding groove, 15-rotating groove, 16-driving member, 161-reset groove, 162-reset block, 163-reset cylinder, 164-reset spring. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the present application to clearly describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments in the present application belong to the scope of protection of this application.

[0041] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0042] In the following, in conjunction with the accompanying drawings, a mechanical lock capable of emergency unlocking provided by an embodiment of the present application is described in detail through specific embodiments and application scenarios.

[0043] Embodiment 1:

[0044] like Figures 1 to 8 As shown, the embodiment of the present application provides a mechanical lock that can be unlocked in an emergency, including a lock shell 1, a lock sleeve 2, a lock core 3, a lock tongue 4, a lock bolt 5, a key 6 and an emergency key 7, characterized in that a limit groove 21 and a locking groove 22 are provided on the inner side of the inner end of the lock sleeve 2, a constraint groove 23 is provided on the outer side of the inner end, a limit block 31 that slides with the limit groove 21 is provided on the inner end peripheral wall of the lock core 3, and a pair of hollow blades 32 are also floatingly installed on the inner end of the lock core 3, and the pair of blades 32 correspond to the locking groove 22 and the constraint groove 23 respectively, and the key 6 and the emergency key 7 are both provided with There is a protrusion 8, the protrusion 8 on the key 6 is located at the front of the rear end of the key 6, and the protrusion 8 on the emergency key 7 is located at the rear end of the emergency key 7. After the key / emergency key 7 is inserted into the lock core 3, the corresponding protrusion 8 lifts the inner blade 32 / the double-side blade 32, so that the inner blade 32 disengages from the locking groove 22 / the double-side blades 32 disengage from the locking groove 22 and the constraint groove 23 respectively, and the lock tongue 4 can be retracted by rotating the lock core 3 / the lock tongue 4 is retracted first, and then the lock bolt 5 is pushed to slide; wherein, the central angle of the limiting groove 21 is greater than the central angle of the constraint groove 23.

[0045] Furthermore, a disc 9 is rotatably installed in the lock housing 1, a square groove 91 is provided on the disc 9, a square block 33 inserted in the square groove 91 is provided at the bottom end of the lock core 3, a sliding block 10 is slidably installed in the lock housing 1, a straight groove 101 perpendicular to the sliding direction of the sliding block 10 is provided on the sliding block 10, and an eccentric cylinder 92 slidably matched with the straight groove 101 is provided at the bottom end of the disc 9; wherein, the rotation of the lock core 3 drives the disc 9 to rotate, and the sliding block 10 is pushed to slide by the eccentric cylinder 92, so that the lock tongue 4 fixed on the sliding block 10 is retracted.

[0046] Furthermore, an arc groove 12 is provided on the sliding block 10, one end of the arc groove 12 is connected to the end of the straight groove 101 close to the locking bolt 5, and the eccentric cylinder 92 is slidably matched with the arc groove 102; wherein, after the locking tongue 4 is fully retracted, the eccentric cylinder 92 is located in the arc groove 102, so that the rotation of the disc 9 will no longer push the sliding block 10 to slide.

[0047] Furthermore, a slide block 11 is slidably installed in the lock housing 1, and a number one partial gear 111 is provided at one end of the slide block 11 facing the lock core 3, and a lock bolt 5 is fixedly provided at the other end, and a number two partial gear 93 is provided on the peripheral wall of the disc 9; wherein, after the lock tongue 4 is fully retracted, the number one partial gear 111 is meshed and connected with the number two partial gear 93, and the rotation of the lock core 3 can push the lock bolt 5 to slide.

[0048] In this embodiment of the present application, due to the adoption of the above-mentioned structure, the lock sleeve 2 is fixedly installed in the lock shell 1, and the lock shell 1 is fixedly installed on the safe. The lock cylinder 3 is rotatably installed in the lock sleeve 2, and the sliding block 10 is slidably installed in the lock shell 1. The sliding block 10 can only be driven by the rotation of the lock cylinder 3 to slide the sliding block 10, so that the lock tongue 4 fixed on the sliding block 10 is extended or retracted. The slider 11 is slidably installed in the lock shell 1. The slider 11 can be pushed to slide by an external password lock, and can also be pushed to slide by the rotation of the lock cylinder 3 to slide the lock bolt 5 fixed on the slider 11. Therefore, the safe only needs to be equipped with one mechanical lock and one password lock, thereby reducing its manufacturing cost;

[0049] When the combination lock is not faulty, by inserting the key 6, the protrusion 8 on the key 6 will lift the inner blade 32, so that the inner blade 32 will be separated from the locking groove 22, and the lock teeth 12 on the key 6 will push the push block 353, so that a pair of anti-torsion blocks 34 can slide into the corresponding V-shaped groove 352 and separate from the corresponding card groove 24. At this time, the lock cylinder 3 can rotate, and the rotation stroke of the lock cylinder 3 is limited by the constraint groove 23. The rotation of the lock cylinder 3 will drive the disk 9 and the eccentric cylinder 92 to rotate. The rotation of the eccentric cylinder 92 will push the sliding block 10 to slide, so that the lock tongue 4 fixed on the sliding block 10 is retracted. Then, by entering the password, the combination lock will push the slider 11 to slide, so that the lock bolt 5 fixed on the slider 11 slides, and the safe is unlocked;

[0050] When the combination lock fails, by inserting the emergency key 7, the protrusion 8 on the emergency key 7 will lift up the double-sided blades 32, so that the double-sided blades 32 are respectively separated from the locking groove 22 and the constraint groove 23, and the lock teeth 12 on the emergency key 7 push the push block 353, so that a pair of anti-torsion blocks 34 can slide into the corresponding V-shaped groove 352 and separate from the corresponding card groove 24. At this time, the lock cylinder 3 can rotate, and the rotation stroke of the lock cylinder 3 is limited by the limiting groove 21. The rotation of the lock cylinder 3 will first drive the disk 9 and the eccentric cylinder 92 to rotate, and the rotation of the eccentric cylinder 92 will push the sliding block 10 to slide, so that the lock tongue 4 fixed on the sliding block 10 is retracted. After the lock tongue 4 is fully retracted, the No. 1 partial gear 111 is meshed and connected with the No. 2 partial gear 92, and the disk 9 rotates and then toggles the slider 11 to slide, so that the lock bolt 5 fixed on the slider 11 slides, and the safe is unlocked;

[0051] Before the lock tongue 4 is fully retracted, the first partial gear 111 is not in contact with the second partial gear 92, so that the rotation of the disc 9 will no longer push the slider 11 to slide;

[0052] After the lock tongue 4 is fully retracted, the eccentric cylinder 92 is located in the arc groove 102, so that the rotation of the disc 9 will no longer push the sliding block 10 to slide;

[0053] The center angle of the limiting groove 21 is greater than the center angle of the restraining groove 23 , so that when the key 6 is inserted into the lock cylinder 3 , the rotation stroke of the lock cylinder is smaller than when the emergency key 7 is inserted into the lock cylinder 3 .

[0054] Embodiment 2:

[0055] like Figure 4 , Fig. 9 and Fig.10As shown, in this embodiment, in addition to the structural features of the aforementioned embodiments, a pair of symmetrical anti-torsion blocks 34 are floatingly installed at the inner end of the lock core 3, a pair of slots 24 are provided at the inner end of the lock sleeve 2, and the pair of anti-torsion blocks 34 respectively correspond to the pair of slots 24, and two groups of locking members 35 are floatingly installed at the inner end of the lock core 3, each group of locking members 35 includes four locking blocks 351, and a pair of anti-torsion blocks 34 respectively correspond to the two groups of locking members 35 and press against the corresponding locking blocks 351; In the embodiment, a V-groove 352 is provided at one end of the locking block 351 facing the anti-torsion block 34, and a pushing block 353 is provided at the other end. Lock teeth 12 are provided on the key 6 and the emergency key 7. After the key 6 and the emergency key 7 are inserted into the lock cylinder 3, the lock teeth 12 thereon can push the pushing block 353, so that the V-grooves 352 on each group of the locking members 35 are aligned, and a pair of the anti-torsion blocks 34 can slide into the corresponding V-grooves 352 and disengage from the corresponding slots 24.

[0056] Furthermore, four connecting ears 25 distributed at equal intervals are fixedly connected to the side wall of the upper end of the lock sleeve 2, and a pair of non-adjacent connecting ears 25 can be optionally installed in the lock housing 1 by screws.

[0057] In this embodiment of the present application, due to the above-mentioned structure, after the key 6 and the emergency key 7 are inserted into the lock cylinder 3, the lock teeth 12 thereon can push the push block 353, so that the V-shaped grooves 352 on each set of locking members 35 are aligned, and a pair of anti-torsion blocks 34 can slide into the corresponding V-shaped grooves 352 and disengage from the corresponding slots 24, at which time the anti-torsion blocks 34 release the lock on the lock cylinder 3;

[0058] After the key 6 and the emergency key 7 are inserted out of the lock cylinder 3, the locking block 351 will be reset by the corresponding spring, and the corresponding anti-torsion block 34 will be pushed by the bevel on the V-shaped groove 352 to make it disengage from the corresponding V-shaped groove 352 and slide into the corresponding slot 24, so that when the lock cylinder 3 is subjected to strong torsion, the anti-torsion block 34 will not damage the locking block 351 with poor strength, and the torque generated by the strong torsion is borne by the lock sleeve 2, the lock cylinder 3, and the anti-torsion block 34, thereby achieving the purpose of improving the torsion strength;

[0059] Four equally spaced connecting ears 25 are fixedly mounted on the upper side wall of the lock sleeve 1. A pair of non-adjacent connecting ears 25 can be optionally mounted on the lock housing 1 by bolts to achieve multi-point fixation and ensure stability after installation.

[0060] Embodiment 3:

[0061] like Fig.11 and Fig.12As shown, in this embodiment, in addition to the structural features of the aforementioned embodiments, a pair of symmetrical arc blocks 13 are fixedly mounted on the inner circumferential wall of the lock core 3, and a slide groove 14 is provided on the arc block 13, and the radial distances of various parts of the slide groove 14 to the axis of the lock core 3 are different; wherein, a rotation groove 15 is provided on the inner side of the inner end of the lock sleeve 2, and a pair of the arc blocks 13 are slidably mounted in the rotation groove 15, and a pair of driving members 16 are provided in the lock sleeve 2, and the pair of driving members 16 can drive the corresponding arc blocks 13 to rotate.

[0062] Furthermore, the driving member 16 includes a reset groove 161, a reset block 162, a reset cylinder 163 and a reset spring 164. The reset groove 161 is arranged in the lock sleeve 2 and is connected to the rotating groove 15. The reset block 162 is slidably installed in the reset groove 161. One end of the reset spring 164 is pressed and fixed on the lock sleeve 2, and the other end is pressed and fixed on the reset block 162. A reset cylinder 163 is arranged on the top of the reset block 162, and the reset cylinder 163 is slidably installed in the slide groove 14.

[0063] In this embodiment of the present application, due to the adoption of the above-mentioned structure, when the key 6 and the emergency key 7 are inserted into the lock cylinder and rotated, a pair of arc blocks 13 and the slide grooves 14 thereon will be driven to rotate. Since the radial distances of the various parts of the slide groove 14 to the axis of the lock cylinder 3 are different, the rotation of the slide groove 14 will push the corresponding reset block 162 and the reset cylinder 163 thereon to slide in the direction of the reset spring 164 and squeeze the reset spring 164. When the external force applied to the key 6 and the emergency key 7 is released, the reset spring 164 will push the corresponding reset block 162 and the reset cylinder 163 thereon to slide. The sliding of the reset cylinder 163 will push the corresponding arc block 13 to rotate in the opposite direction. The arc block 13 drives the lock cylinder 3 to rotate in the opposite direction, so that the lock tongue 4 and the lock bolt 5 are completely reset, thereby avoiding the situation where the user forgets to rotate or directly pulls out the key 6 or the emergency key 7 when closing the safe, thereby ensuring the safety protection performance of the safe.

[0064] The return spring 164 is the spring with the greatest elastic force in the entire mechanical lock, and the return spring 164 will not fail due to other structures.

[0065] It should be noted that, in this article, the terms "comprise", "include" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise one..." do not exclude the presence of other identical elements in the process, method, article or device including the element. In addition, it should be pointed out that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in reverse order according to the functions involved, for example, the described method may be performed in an order different from that described, and various steps may also be added, omitted, or combined. In addition, the features described with reference to certain examples may be combined in other examples.

[0066] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

Claims

1. A mechanical lock capable of emergency unlocking, comprising a lock housing, a lock sleeve, a lock core, a lock tongue, a lock bolt, a key and an emergency key, characterized in that: A limiting groove and a locking groove are provided on the inner side of the inner end of the lock sleeve, and a restraining groove is provided on the outer side of the inner end. A limiting block that slides with the limiting groove is provided on the peripheral wall of the inner end of the lock core. A pair of hollow blades are also floatingly installed on the inner end of the lock core, and the pair of blades correspond to the locking groove and the restraining groove respectively. Both the key and the emergency key are provided with convex blocks. The convex block on the key is located at the front of the rear end of the key, and the convex block on the emergency key is located at the rear of the rear end of the emergency key. After the key / emergency key is inserted into the lock core, the corresponding convex block lifts the inner blade / the two-side blades to make the inner blade disengage from the locking groove / the two-side blades disengage from the locking groove and the restraining groove respectively, and the lock tongue can be retracted by rotating the lock core / the lock tongue is retracted first, and then the lock bolt is pushed to slide; Among them, the center angle of the limiting groove is greater than the center angle of the constraint groove.

2. A mechanical lock capable of emergency unlocking according to claim 1, characterized in that: A disc is rotatably installed in the lock housing, a square groove is arranged on the disc, a square block inserted in the square groove is arranged at the bottom of the lock core, a sliding block is slidably installed in the lock housing, a straight groove perpendicular to the sliding direction of the sliding block is arranged on the sliding block, and an eccentric cylinder slidably matched with the straight groove is arranged at the bottom of the disc; The rotation of the lock core drives the disc to rotate, and the eccentric cylinder pushes the sliding block to slide, so that the lock tongue fixed on the sliding block is retracted.

3. A mechanical lock capable of emergency unlocking according to claim 2, characterized in that: The sliding block is provided with an arc groove, one end of which is connected with one end of the straight groove close to the locking bolt, and the eccentric cylinder is slidably matched with the arc groove; Wherein, after the locking tongue is fully retracted, the eccentric cylinder is located in the arc groove, so that the rotation of the disc will no longer push the sliding block to slide.

4. The mechanical lock capable of emergency unlocking according to claim 1, characterized in that: A slider is slidably installed in the lock housing, a first partial gear is arranged at one end of the slider facing the lock core, a lock bolt is fixed at the other end, and a second partial gear is arranged on the peripheral wall of the disc; Among them, after the lock tongue is fully retracted, the first partial gear is meshed and connected with the second partial gear, and the rotation of the lock core can push the lock bolt to slide.

5. The mechanical lock capable of emergency unlocking according to claim 1, characterized in that: A pair of symmetrical anti-torsion blocks are installed at the inner end of the lock core in a floating manner, a pair of slots are provided at the inner end of the lock sleeve, and the pair of anti-torsion blocks correspond to the pair of slots respectively. Two groups of locking pieces are installed at the inner end of the lock core in a floating manner, and each group of locking pieces includes four locking blocks. A pair of anti-torsion blocks correspond to the two groups of locking pieces respectively and press against the corresponding locking blocks. Among them, the locking block is provided with a V-shaped groove at one end facing the anti-torsion block, and a pushing block is provided at the other end. The key and the emergency key are both provided with locking teeth. After the key and the emergency key are inserted into the lock cylinder, the locking teeth thereon can push the pushing block so that the V-shaped grooves on each group of the locking parts are aligned, and a pair of the anti-torsion blocks can slide into the corresponding V-shaped grooves and disengage from the corresponding slots.

6. The mechanical lock capable of emergency unlocking according to claim 1, characterized in that: Four connecting ears distributed at equal intervals are fixedly connected to the side wall of the upper end of the lock sleeve, and a pair of non-adjacent connecting ears can be optionally installed in the lock housing by screws.

7. The mechanical lock capable of emergency unlocking according to claim 1, characterized in that: A pair of symmetrical arc blocks are fixedly mounted on the inner peripheral wall of the lock core, and a slide groove is arranged on the arc block, and the radial distances of various parts of the slide groove to the axis of the lock core are different; Wherein, a rotation groove is arranged on the inner side of the inner end of the locking sleeve, a pair of arc blocks are slidably installed in the rotation groove, a pair of driving members are arranged in the locking sleeve, and the pair of driving members can drive the corresponding arc blocks to rotate.

8. The mechanical lock capable of emergency unlocking according to claim 7, characterized in that: The driving members all include a reset groove, a reset block, a reset cylinder and a reset spring. The reset groove is arranged in the lock sleeve and is connected to the rotation groove. The reset block is slidably installed in the reset groove. One end of the reset spring is pressed and fixed on the lock sleeve, and the other end is pressed and fixed on the reset block. A reset cylinder is arranged on the top of the reset block, and the reset cylinder is slidably installed in the slide groove.

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