Tongue anti-insertion theft opening structure and door lock with same

Abstract

The present application belongs to the technical field of mechanical lock, and particularly relates to a latch anti-insert theft opening structure and a door lock with the same, wherein the latch anti-insert theft opening structure comprises a latch assembly, a limiting assembly, an unlocking assembly and a locking assembly, the locking assembly has a locking state of limiting movement of the limiting part to the latch retracting path in the door opening state, and an unlocking state of not limiting the movement of the limiting part to the latch retracting path in the door closing state. By setting the locking assembly, the limiting end of the limiting part is limited to move to the latch retracting path in the door opening state, and the limiting part is not limited to move to the latch retracting path in the door closing state; that is, the limiting part will not move to the latch retracting path in the door opening state, so that the latch is in the unlocking state; in the door closing state, the limiting part is not limited by the locking assembly and will move to the latch retracting path, the latch is locked, and the effect of anti-insert theft opening is achieved; meanwhile, in the door opening state, the latch is unlocked and can be retracted or extended out of the lock shell.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of mechanical locks, and particularly relates to a latch anti-insert theft opening structure and a door lock with the same. BACKGROUND

[0002] Door locks play an important role in protecting the safety of people and property indoors, and are generally divided into electronic door locks and mechanical door locks according to the opening mode, wherein the mechanical door lock is opened or locked by a key matched with the lock.

[0003] A conventional mechanical door lock is provided with a main lock and a latch assembly. The main lock of the mechanical lock is controlled by a lock cylinder, and the latch assembly is controlled by a handle. The latch assembly is used to position the door panel on the door frame, so as to be simply locked with the door frame and not locked. In the actual application process, the working process of the door lock on the market is as follows: when the door is closed, the latch assembly is pressed by the door frame, and the latch assembly is retracted into the door lock. When the door is matched with the door frame, the latch position is just aligned with the latch hole on the door frame. The latch head is extended into the latch hole due to the biasing force of the return spring, so that the door can be in a closed state. Since only pressure needs to be applied to the latch to retract the latch into the door lock, in the case that the door is closed but not locked, an insert object such as an elastic insert piece can be used to apply pressure to the latch through the gap between the door and the door frame to press the latch into the door lock, so as to achieve the abnormal opening of the door, which brings safety hazards to the safety of people and property indoors.

[0004] In order to increase the safety of the door lock, the existing door lock increases an auxiliary tongue to form a multi-layered anti-theft structure. However, this structure needs to increase a tongue hole on the door frame and the door lock, which will inevitably have a great impact on the structural strength of the door lock and the door frame, and the safety performance is unstable.

[0005] Chinese patent document CN206829807U discloses a theftproof lock body latch limiting assembly, mainly comprising a prevent-inserting sheet and a push sheet. The tail end of the prevent-inserting sheet is installed on the lock body at the tail end of the latch connecting rod through a hinged shaft. The head end of the prevent-inserting sheet is arranged close to the latch connecting rod and acts on the back side of the latch to resist the rear movement of the latch. The push sheet is arranged on the latch connecting rod and acts on the prevent-inserting sheet to make the head end of the prevent-inserting sheet move away from the latch connecting rod when the latch connecting rod moves rearward. The above technical solution sets the prevent-inserting sheet in the lock body to make the prevent-inserting sheet act on the back side of the latch to resist the rear movement of the latch, thereby realizing the theftproof effect. However, the latch limiting assembly of the above structure still has problems. Since the prevent-inserting sheet acts on the back side of the latch to resist the rear movement of the latch, the prevent-inserting sheet needs to be removed from the latch by means of a handle or a key every time when the door needs to be closed, which makes the operation more troublesome, and the prevent-inserting sheet or the entire door lock is easily damaged when the door is closed by force. SUMMARY

[0006] The technical problem to be solved by the present application is to overcome the defects in the prior art that the existing door lock improves the theftproof performance by the prevent-inserting sheet in the lock body, which causes the door closing operation to be troublesome and easily damages the prevent-inserting sheet or the door lock, thereby providing a latch prevent-inserting theft opening structure which is simple in structure, does not need to increase an auxiliary tongue structure, does not need to remove the prevent-inserting sheet from the latch by means of a handle when the door is closed, and is stable in safety performance, and a door lock provided with the latch prevent-inserting theft opening structure.

[0007] To this end, the present application provides a latch prevent-inserting theft opening structure, comprising:

[0008] A latch assembly comprising a latch capable of extending out of or retracting into a lock housing;

[0009] A limiting assembly comprising a limiting member rotatably installed in the lock housing, and a limiting biasing member for providing the limiting end of the limiting member close to the latch with a movement towards a retracting path of the latch;

[0010] An unlocking assembly arranged in the lock housing in linkage with a handle, and pushing the limiting member to rotate to make the limiting end move out of the retracting path of the latch;

[0011] Further comprising:

[0012] A locking assembly movably arranged in the lock housing, having a locking state for limiting the movement of the limiting member to the retracting path of the latch in a door opening state, and an unlocking state for not limiting the movement of the limiting member to the retracting path of the latch in a door closing state.

[0013] Optionally, the latch bolt anti-insertion opening structure, the locking assembly has a locking abutting end located on the latch bolt retraction path, when closing the door, the latch bolt pushes the locking abutting end to move, so that the locking assembly moves from the locking state to the unlocking state.

[0014] Optionally, the latch bolt anti-insertion opening structure, the locking assembly comprises a first locking piece, one end of the first locking piece is the locking abutting end, and the first locking piece has a locking limiting end for limiting movement of the limiting piece to the latch bolt retraction path in the locking state and not limiting movement of the limiting piece to the latch bolt retraction path in the unlocking state.

[0015] Optionally, the latch bolt anti-insertion opening structure, the reciprocating movement direction of the first locking piece is parallel to the movement path of the latch bolt.

[0016] Optionally, the latch bolt anti-insertion opening structure, the limiting piece has a limiting locking surface abutting against the locking limiting end in the locking state and a limiting unlocking surface abutting against the locking limiting end in the unlocking state, the distance from the limiting locking surface to the movement path of the latch bolt is less than the distance from the limiting unlocking surface to the movement path of the latch bolt, and the limiting locking surface and the limiting unlocking surface are smoothly connected.

[0017] Optionally, the latch bolt anti-insertion opening structure, the locking assembly further comprises a first movement biasing piece connected with the first locking piece and providing a movement direction of the first locking piece towards the extension direction of the latch bolt.

[0018] Optionally, the latch bolt anti-insertion opening structure, the locking assembly further comprises a second locking piece for locking the first locking piece in the unlocking state and unlocking the first locking piece in the locking state.

[0019] Optionally, the latch bolt anti-insertion opening structure, the second locking piece is arranged in linkage with the handle.

[0020] Optionally, the latch bolt anti-insertion opening structure, the second locking piece is movably arranged in the lock housing, and a second movement biasing piece is mounted on the second locking piece to deflect a second locking part of the second locking piece towards the first locking piece, and the first locking piece has a first locking part arranged in cooperation with the second locking part.

[0021] Optionally, the latch bolt anti-insertion opening structure, the first locking part is a groove recessed inwardly of the first locking piece, and the second locking part is a protrusion protruding outwardly of the second locking piece, in the locking state, the protrusion abuts against the outer side of the groove wall, and in the unlocking state, the protrusion extends into the groove and abuts against the inner wall of the groove.

[0022] Optionally, the second locking member is rotatably arranged in the lock housing, and the second moving biasing member is a torsion spring.

[0023] Optionally, the unlocking assembly includes a second pushing portion arranged to abut against and push the unlocking portion on the second locking member to move the second locking member against the second moving biasing member.

[0024] Optionally, the second pushing portion is a protruding structure arranged in the extension direction of the latch bolt and protruding towards the second locking member.

[0025] Optionally, the unlocking assembly further includes a first pushing member controlled to move by a key and arranged to abut against and drive the second pushing portion to move so as to move the second locking member against the second moving biasing member.

[0026] Optionally, the unlocking assembly further includes a first pushing portion connected to the handle, and a second pushing member arranged to slide on the latch bolt connecting rod of the latch bolt assembly, wherein the first pushing portion is arranged to push the second pushing member to move when the second pushing member moves, and the first pushing portion is arranged to abut against and drive the limiting member to rotate so as to move the limiting end out of the retraction path of the latch bolt, and the second pushing portion is arranged on the first pushing portion.

[0027] Another object of the present application is to provide a door lock including a lock housing and a latch bolt anti-insertion opening structure arranged in the lock housing, wherein the latch bolt anti-insertion opening structure is any one of the latch bolt anti-insertion opening structures described above.

[0028] The technical scheme of the present application has the following advantages:

[0029] 1. The latch bolt anti-insertion opening structure provided by the present application includes a latch bolt assembly including a latch bolt capable of extending out of or retracting into a lock housing.

[0030] A limiting assembly including a limiting member rotatably arranged in the lock housing, and a limiting biasing member arranged to provide a limiting end of the limiting member close to the latch bolt with a movement towards a retraction path of the latch bolt.

[0031] An unlocking assembly arranged in the lock housing and connected to a handle, wherein the unlocking assembly is arranged to abut against and drive the limiting member to rotate so as to move the limiting end out of the retraction path of the latch bolt.

[0032] Further including:

[0033] The locking assembly is movably arranged in the lock housing and has a locking state for limiting the movement of the limiting part to the latch retraction path in the door opening state and an unlocking state for not limiting the movement of the limiting part to the latch retraction path in the door closing state.

[0034] The latch anti-insert theft opening structure has the locking assembly arranged on the latch retraction path, and the locking end of the limiting part is limited from moving to the latch retraction path in the door opening state and is not limited from moving to the latch retraction path in the door closing state, that is, the locking end of the limiting part is not moved to the latch retraction path to limit the latch from retracting into the lock housing in the door opening state, so that the latch is unlocked, and the locking end of the limiting part is not limited by the locking assembly and is moved to the latch retraction path to prevent the latch from retracting into the lock housing and being locked in the door closing state, so that the latch anti-insert theft opening effect is achieved, and the latch is freely retracted and extended into the lock housing in the door opening state without needing to use a handle or a key.

[0035] 2. The latch anti-insert theft opening structure provided by the present application, wherein the locking assembly comprises a first locking part, one end of the first locking part is the locking abutting end, and the first locking part has a locking limiting end for limiting the movement of the limiting part to the latch retraction path in the locking state and not limiting the movement of the limiting part to the latch retraction path in the unlocking state.

[0036] 3. The latch anti-insert theft opening structure provided by the present application, wherein the locking assembly comprises a first locking part and a second locking part, the second locking part is arranged to unlock the first locking part in the locking state without adding other unlocking structures for unlocking and locking the first locking part, the use of parts is reduced, the structure is more compact, the first locking part can be locked in the unlocking state, and the reliability of the first locking part in the locking state is increased.

[0037] 4. The latch anti-insert theft opening structure provided by the present application, wherein the locking assembly has the locking abutting end arranged on the latch retraction path, the latch abuts against the locking abutting end, the latch assembly is switched from the locking state to the unlocking state to be unlocked, and the locking assembly and the latch assembly have the correlation.

[0038] 5. The door lock provided by the present application can lock the latch bolt assembly when the door is closed, prevent objects from entering the gap between the door and the door frame to push the latch bolt assembly back into the lock case 5, and effectively prevent theft, thereby protecting personal safety and property safety. Meanwhile, when the door is opened, the latch bolt assembly is in an unlocked state, and when the door is closed, the latch bolt assembly does not need to be unlocked through the handle, which is more convenient to use and prevents damage to the door lock or the door frame caused by violent closing of the door. BRIEF DESCRIPTION OF DRAWINGS

[0039] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the specific embodiments or the prior art description will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0040] Figure 1 Fig. 4 is a structural schematic diagram of the latch bolt anti-theft opening structure of the present application in a door closed state (lock assembly locked state);

[0041] Figure 2 Fig. 4 is a structural schematic diagram of the latch bolt anti-theft opening structure of the present application in a door closed state (lock assembly locked state);

[0042] Figure 3 Fig. 4 is a structural schematic diagram of the latch bolt anti-theft opening structure of the present application in a door closed state (lock assembly locked state);

[0043] Figure 4 Fig. 4 is a structural schematic diagram of the latch bolt anti-theft opening structure of the present application in a door closed state (lock assembly locked state);

[0044] Figure 5 Fig. 4 is a structural schematic diagram of the latch bolt anti-theft opening structure of the present application in a door closed state (lock assembly locked state);

[0045] Figure 6 Fig. 4 is a structural schematic diagram of the latch bolt anti-theft opening structure of the present application in a door closed state (lock assembly locked state);

[0046] BRIEF DESCRIPTION OF DRAWINGS

[0047] 1 - latch bolt assembly; 11 - latch bolt; 12 - latch bolt connecting rod; 13 - second return spring; 14 - third return spring; 15 - first return spring; 16 - first blocking ring; 17 - second blocking ring; 18 - third blocking ring; 19 - fourth blocking ring; 110 - protrusion;

[0048] 2 - limiting assembly; 21 - limiting member; 210 - limiting end; 211 - limiting unlocking surface; 212 - limiting locking surface; 213 - unlocking protrusion; 22 - limiting biasing member;

[0049] 3 – Locking assembly; 31 – First locking element; 311 – Locking limit end; 312 – First sliding connection part; 313 – Second sliding connection part; 314 – Locking abutment end; 32 – Second locking element; 321 – Second locking part; 322 – Unlocking part; 33 – First moving biasing element; 34 – Second moving biasing element;

[0050] 4 - Unlocking component; 41 - First lever; 411 - Second push part; 412 - First push part; 42 - Second push member; 43 - First push member;

[0051] 5 - Lock case;

[0052] 6 - Fixed stop. Detailed Implementation

[0053] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0054] Example 1

[0055] The anti-theft structure of the oblique tongue in this embodiment, such as Figures 1 to 6 As shown, the lock housing 5 is equipped with a latch assembly 1, a limiting assembly 2, an unlocking assembly 4, and a locking assembly 3. The latch assembly 1 includes a latch 11 and a latch connecting rod 12 connected to the latch 11. The latch 11 can extend or retract into the lock housing 5. The limiting assembly 2 includes a limiting member 21 and a limiting biasing member 22. The limiting member 21 is rotatably installed in the lock housing 5 and has a limiting end 210. The limiting biasing member 22 applies pressure to the limiting member 21 to move towards the retraction path of the latch 11. The biasing force causes the limiting end 210 to be in the retraction path of the latch 11; the unlocking component 4 is linked with the handle (not shown) to push the limiting member 21 to rotate so that the limiting end 210 of the limiting member 21 moves out of the retraction path of the latch 11; the locking component 3 is movably disposed in the lock housing 5 and has a locked state that restricts the limiting member 21 from moving into the retraction path of the latch 11 in the open state, and an unlocked state that does not restrict the limiting member 21 from moving into the retraction path of the latch 11 in the closed state.

[0056] The above-mentioned anti-burglary opening structure of the latch, by setting the locking assembly 3, limits the movement of the limiting end 210 of the limiting piece 21 to the retraction path of the latch 11 in the open door state, and does not limit the movement of the limiting piece 21 to the retraction path of the latch 11 in the closed door state; that is, in the open door state, the limiting end 210 of the limiting piece 21 will not move to the retraction path of the latch 11 under the action of the locking assembly 3 to limit the retraction of the latch 11 into the lock shell 5, so that the latch 11 is in the unlocked state; in the open door state, the limiting end 210 of the limiting piece 21 is not limited by the locking assembly 3 and will move to the retraction path of the latch 11 to prevent the latch 11 from retracting into the lock shell 5, thereby preventing objects from entering the gap between the door and the door frame to push the latch 11 into the lock shell 5, thereby achieving the effect of anti-burglary opening; at the same time, in the open door state, the latch 11 is in the unlocked state and can freely retract and extend into the lock shell 5 without the need for a handle or key; the structure is more reasonable.

[0057] For the locking assembly 3, as shown in Figures 1 to 3 , it includes a first locking piece 31, a second locking piece 32, a first moving biasing piece 33 and a second moving biasing piece 34, the first moving biasing piece 33 and the first locking piece 31 are connected and constitute a linkage mechanism; the second moving biasing piece 34 and the second locking piece 32 are connected and also constitute a linkage mechanism, the second locking piece 32 is linked with the handle; the first locking piece 31 is provided with a first locking portion 310, the second locking piece 32 is provided with a second locking portion 321, the first locking portion 310 cooperates with the second locking portion 321, in the unlocked state, the first locking portion 310 abuts on the end face opposite to the second locking portion 321 of the second locking piece 32, in the locked state, the first locking portion 310 abuts on the side end of the second locking portion 321, that is, the left end face as shown in Figure 2 ; specifically, for the first locking piece 31, as shown in Figure 5As shown, the first locking component 31 is plate-shaped and includes a first sliding connection portion 312 and a second sliding connection portion 313 bent forward and formed on the right side of the upper end of the first sliding connection portion 312. The first sliding connection portion 312 is approximately Z-shaped and is slidably disposed on the bottom end surface of the lock housing 5, and the second sliding connection portion 313 is slidably disposed on the top surface of the lock housing 5. Specifically, one or two downward protruding protrusions (not shown) can be provided on the top surface of the lock housing 5, and a long strip-shaped groove (not shown) extending in the extension or retraction direction is provided on the second sliding connection portion 313 to cooperate with the protrusions. The left end of the first sliding connection portion 312, that is, the part that abuts against the inner end face of the latch 11 in the locked state, is the locking abutment end 314. The locking abutment end 314 is located on the retraction path of the latch 11. When closing the door, the latch 11 pushes the locking abutment end 314 to move, so that the locking component 3 moves from the locked state to the unlocked state. The first sliding connection 312 has a forward-protruding portion, namely the locking and limiting end 311. The lower end of the first sliding connection 312, located at the lower right side of the locking and limiting end 3111, has a downward-protruding portion. This protruding portion forms a first locking portion 310 with the locking abutment end 314. An L-shaped groove (not shown) is formed between the first locking portion 310 and the locking abutment end 314. In the locked state, the second locking portion 321 of the second locking member 32 abuts against this groove and against the left end face of the first locking portion 310. The left end of the second sliding connection 313 has a downward-protruding portion for connecting the right end of the first moving bias member 33. For example, on the top surface of the lock housing 5, at the left end of the second sliding connection 313, there is a protruding structure (not shown) for connecting the left end of the first moving bias member 33. The first moving bias member 33 applies pressure to the first locking member 31 in the direction of the tongue 11 extending outwards. Figures 1 to 3 The biasing force shown on the left side is represented by a conventional tubular spring for the first moving biasing element 33; specifically, for the second locking element 32, as shown... Figures 1 to 3 As shown, it is hook-shaped and has a second locking part 321 and an unlocking part 322. The second locking part 321 is as follows: Figure 1 The hook-shaped structure shown on the left end, in the unlocked state, has the second locking part 321 abutting against the portion of the first locking member 31 that protrudes towards the second locking member 32, i.e., the lower end surface of the first locking part 310; the unlocking part 322 is also as shown... Figure 2The right end of the shown part extends downwardly and protrudes, and a notch (not shown) is arranged on the lower left end surface of the part for abutting and fitting with the unlocking assembly 4. The second moving biasing member 34 is a torsion spring. For example, a first positioning pin (not shown) can be arranged at the lower end of the locking assembly 3 in the lock housing 5, the second moving biasing member 34 is sleeved on the first positioning pin and one end of the second moving biasing member 34 abuts on a first clamping part (not shown) arranged at the right end of the second moving biasing member 34, and the other end abuts on the lower end surface of a fixed stopper 6 arranged in the lock housing 5 and located on the retracting path of the latch bolt 11 for limiting the retraction of the latch bolt connecting rod 12. For the fixed stopper 6, it is fixedly arranged on the bottom end surface of the lock housing 5 and located on the retracting path of the latch bolt 11, and the latch bolt connecting rod 12 penetrates through the fixed stopper 6. The second moving biasing member 34 applies a biasing force to the second locking member 32 to move in the direction of the first locking member 31 so that the second locking member 32 rotates around the first positioning pin. Alternatively, the second locking member 32 can also move in a sliding manner instead of rotating. For example, a sliding groove (not shown) perpendicular to the retracting direction of the latch bolt 11 is arranged in the lock housing 5, the second locking member 32 slides in the direction of the first locking member 31 so that the second locking part 321 abuts on the first locking part 310 and in the locked state, the second locking part 321 abuts in the notch on the left side of the first locking part 310 and abuts on the first locking part 310. Correspondingly, the second moving biasing member 34 is not a torsion spring, but only needs to apply a biasing force to the second locking part 321 in the direction of the first locking member 31. Optionally, the reciprocating movement direction of the first locking member 31 is parallel to the movement path of the latch bolt 11. As another alternative embodiment, the first locking part 310 is a recess (not shown) recessed inwardly of the first locking member 31, and the second locking part 321 is a protrusion (not shown) protruding outwardly of the second locking member 32. In the locked state, the protrusion abuts on the outer side of the groove wall of the recess, and in the unlocked state, the protrusion extends into the recess and abuts on the inner wall of the recess.

[0058] For the limiting assembly 2, Figures 1 to 3As shown, the limiting member 21 is in the form of a plate, and the right end is sleeved on a second positioning pin (not shown) arranged in the lock housing 5. The limiting biasing member 22 is sleeved on the second positioning pin and abuts against the second clamping portion (not shown) at the right end of the limiting member 21 at one end, and abuts against the right side surface of the lock housing 5 at the other end. The limiting biasing member 22 applies a biasing force to the limiting member 21 to move the limiting member 21 downward, i.e., toward the direction of the latch bolt connecting rod 12. Specifically, the limiting member 21 and the first locking member 31 have a gap therebetween, so that the movement therebetween is not interfered by each other. The lower end surface of the limiting member 21, i.e., the end surface toward the direction of the second locking member 32, is provided with a notch at the middle position. The bottom end surface of the notch is formed as a limiting locking surface 212. The left side of the notch, i.e., the limiting end 210, is formed with a limiting unlocking surface 211. The right side of the notch, i.e., the side close to the limiting biasing member 22, is formed with an unlocking protrusion 213 protruding toward the direction of the second locking member 32. The limiting locking surface 212 and the limiting unlocking surface 211 are smoothly transitioned, specifically, for example, in the form of a slope. The limiting locking surface 212 and the unlocking protrusion 213 are transitioned in the form of a circular arc. In the locked state, the locking limiting end 311 abuts against the limiting locking surface 212. In the unlocked state, the locking limiting end 311 abuts against the limiting unlocking surface 211. Specifically, the distance from the limiting locking surface 212 to the movement path of the latch bolt 11 is less than the distance from the limiting unlocking surface 211 to the movement path of the latch bolt 11. The distance from the unlocking protrusion 213 to the movement path of the latch bolt 11 is greater than the distance from the limiting locking surface 212 to the movement path of the latch bolt 11.

[0059] For the unlocking assembly 4, the unlocking assembly 4 comprises a first pushing member 43, a second pushing member 42, a first pushing portion 412 and a second pushing portion 411 arranged on the handle linkage plate assembly. Specifically, as shown in Figures 1 to 3 The second pushing portion 411 is a protruding structure arranged on the first handle linkage plate 41 and protruding toward the direction of the second locking member 32. The first pushing portion 412 is a square structure integrally formed on the upper end of the first handle linkage plate 41 and located between the fixed blocking member 6 and the second pushing member 42. The first pushing member 43 is a push plate structure connected with the key and movable up and down along the direction perpendicular to the extension and retraction direction of the latch bolt 11. When the first pushing member 43 moves upward to abut against the first pushing portion 412, the first pushing portion 412 is rotated by the second pushing portion 411. The second pushing member 42 is a plate-shaped structure slidingly sleeved on the latch bolt connecting rod 12 and located on the right side of the fixed blocking member 6. A hole (not shown) is arranged in the middle of the second pushing member 42 to accommodate the latch bolt connecting rod 12. Specifically, as shown in Figures 1 to 3As shown, the second pushing part 411 is a protruding structure provided on the left end of the first dial plate 41 and protruding towards the second locking member 32. The dial plate assembly (not shown) comprises a clutch structure (not shown) and the first dial plate 41 and the second dial plate (not shown) linked with the clutch structure. The left end of the first dial plate 41 is provided with a protruding part protruding towards the upper left, which is the second pushing part 411. The second pushing part 411 is matched with the unlocking part 322. When unlocking, the key is turned to push the first pushing member 43 to move upwards, and the first pushing member 43 is in abutment with the second pushing part 411 to push the second pushing part 411 to rotate the first pushing part 412. When the second pushing part 411 is in abutment with the unlocking part 322 on the right end of the second locking member 32, the unlocking part 322 is pushed to move upwards, so that the second locking part 321 of the second locking member 32 is rotated downwards against the biasing force of the second moving biasing member 34, and is not in abutment with the first locking part 310 to move left away from the reset path of the first locking member 31. The first locking member 31 is moved leftwards so that the locking abutment end 314 is in abutment with the rear end surface of the latch bolt 11. At this time, the handle is turned, and the first pushing part 412 on the top end of the first dial plate 41 pushes the second pushing member 42 to move rightwards when the first dial plate 41 is rotated. Since the second pushing member 42 is in abutment with the unlocking protruding part 213 in the locking state, more specifically, in abutment with the left side surface of the unlocking protruding part 213, the second pushing member 42 is moved rightwards to push the limiting member 21 to move upwards against the biasing force of the limiting biasing member 22, and at the same time, the limiting member 21 is moved upwards to move away from the retracting path of the latch bolt 11 until the limiting unlocking surface 211 is in abutment with the locking limiting end 311, so as to unlock the latch bolt 11. The handle is continuously turned, and the first dial plate 41 pushes the second pushing member 42 to push the latch bolt link 12 and the latch bolt 11 to move rightwards and retract into the lock shell 5. Optionally, the first pushing part 412, the second pushing part 411 and the first dial plate 41 are an integral structure. The unlocking assembly 4 is a prior structure, which will not be described in detail.

[0060] For the latch bolt assembly 1, as Figure 6As shown, the first reset spring 15, the second reset spring 13 and the third reset spring 14 are sequentially arranged on the latch connecting rod 12 from the direction close to the latch 11 to the direction away from the latch 11, the first stop ring 16 is arranged between the first reset spring 15 and the second reset spring 13, the right end of the second reset spring 13 is provided with the second stop ring 17, the second stop ring 17 is located at the left side of the fixed stop piece 6, the third reset spring 14 is arranged at the right end of the second pushing piece 42, the right end of the third reset spring 14 is provided with the third stop ring 18 and the fourth stop ring 19, the first stop ring 16, the second stop ring 17 and the third stop ring 18 are closed-loop stop rings, the fourth stop ring 19 is an open-loop stop ring, and specific limitations and descriptions are not made; the convex points 110 protruding in the radial direction are arranged at the right end of the second pushing piece 42 on the latch connecting rod 12, a plurality of convex points 110 are uniformly arranged in the circumferential direction, and the third reset spring 14 is sleeved outside the convex points 110. The convex points 110 are arranged to limit the right movement of the second pushing piece 42 out of the latch connecting rod 12.

[0061] In order to facilitate understanding of the positions and connection relationships between the components in different states in the present application, the following describes the three states of opening the door, closing the door and opening the door by the key or handle.

[0062] When the door is opened, the latch 11 is completely stretched out of the lock shell 5, the locking assembly 3 is in the locked state, the limiting end 210 of the limiting piece 21 enters the retraction path of the latch 11, at this time, the locking abutting end 314 of the first locking piece 31 abuts on the inner end face of the latch 11, i.e. the right end face, the limiting unlocking face 211 of the limiting piece 21 abuts on the locking limiting end 311, the limiting end 210 of the limiting piece 21 is not in the retraction path of the latch 11, the second locking part 321 of the second locking piece 32 abuts on the first locking part 310 of the first locking piece 31, and the second pushing piece 42 is located at the right end of the limiting locking face 212 of the limiting piece 21 but does not abut between the limiting piece 21; since the limiting piece 21 does not block the retraction path of the latch 11, the latch assembly 1 is unlocked, and the latch 11 can freely retract into the lock shell 5 or stretch out of the lock shell 5.

[0063] When the door is closed, the bevel tongue 11 pushes the locking abutting end 314 of the first locking member 31 due to the extrusion of the door frame, and pushes the locking assembly 3 into the lock shell 5. When the bevel tongue 11 is completely in the lock shell 5, the right end surface of the first locking part 310 of the first locking member 31 abuts against the left end surface of the fixed stop piece 6. At this time, since the first locking part 310 does not abut against the second locking part 321, the second locking part 321 moves towards the first locking member 31, i.e. the upper end, under the action of the second moving biasing member 34, and blocks the reset path, i.e. the left moving path, of the first locking member 31. After the door is closed, since the door frame does not extrude the bevel tongue assembly 1, the first locking member 31 moves towards the extending direction under the action of the first moving biasing member 33, and pushes the bevel tongue 11 to extend out of the lock shell 5. When the left side of the first locking part 310 of the first locking member 31 abuts against the second locking part 321, at this time, the first locking member 31 does not move towards the extending direction, and the bevel tongue 11 continues to move towards the extending direction under the reset action of the first reset spring 15 and the second reset spring 13, and extends out of the lock shell 5. When the bevel tongue 11 completely extends out of the lock shell 5, at this time, since the first locking member 31 does not abut against the inner end surface of the bevel tongue 11, the locking assembly 3 is in the unlocked state, and thus the distance between the locking limiting end 311 and the inner end surface of the bevel tongue 11 becomes larger. Therefore, the limiting member 21 moves towards the bevel tongue connecting rod 12, i.e. downwards, under the action of the limiting biasing member 22, and enters the gap between the inner end surface of the bevel tongue 11 and the locking limiting end 311 to block the retracting path of the bevel tongue 11. When the limiting locking surface 212 of the limiting member 21 abuts against the locking limiting end 311, i.e. the limiting end 210 of the limiting member 21 completely enters the retracting path of the bevel tongue 11, the second pushing member 42 abuts against the unlocking protrusion 213 of the limiting member 21. Due to the abutting action of the locking limiting end 311, the limiting member 21 is fixed on the retracting path of the bevel tongue 11, and the bevel tongue assembly 1 is locked. An object inserted through the door gap cannot push the bevel tongue 11 back into the lock shell 5.

[0064] When the door needs to be opened, the first pushing piece 43 is pushed upward by rotating the key, and the second pushing part 411 is rotated upward to abut against the unlocking part 322 of the second locking piece 32, and then the handle is rotated, and the handle rotates to push the unlocking part 322 upward, and the second locking part 321 of the second locking piece 32 rotates downward to be separated from the first locking part 310 of the first locking piece 31, so that the first locking piece 31 is released from the reset path. At the same time, when the handle is rotated to rotate the first push plate 41, the second pushing piece 42 is pushed rightward by the first pushing part 412, and the second pushing piece 42 pushes the unlocking convex part 213 to rotate the limiting piece 21 upward around the second positioning pin against the biasing force of the limiting biasing piece 22, and the limiting end 210 of the limiting piece 21 also rotates upward to be separated from the retraction path of the latch 11, until the limiting unlocking surface 211 of the limiting piece 21 abuts against the locking limiting end 311 of the first locking piece 31. At this time, the first locking piece 31 is reset to the extension direction of the latch 11 under the action of the first moving biasing piece 33, until the locking abutting end 314 of the first locking piece 31 abuts against the inner end surface of the latch 11, and the latch assembly 1 and the first locking piece 31 form a linkage mechanism. The handle is continuously rotated, and the first push plate 41 drives the linkage mechanism formed by the latch assembly 1 and the first locking piece 31 to retract into the lock shell 5, until the latch 11 is completely retracted into the lock shell 5, the unlocking is completed, and the door can be opened. After the door is opened, the latch 11 and the latch connecting rod 12 are extended out of the lock shell 5 in the extension direction under the action of the first reset spring 15 and the second reset spring 13, and the first locking piece 31 is reset in the extension direction under the action of the first moving biasing piece 33. Since the handle is still in the rotating state at this time, that is, the second pushing part 411 still abuts against the unlocking part 322 of the second locking piece 32, and the first pushing part 412 still abuts against the left side of the second pushing piece 42. Therefore, the reset path of the first locking part 310 of the first locking piece 31 is not limited, until the locking abutting end 314 of the first locking piece 31 is completely reset to abut against the inner end surface of the latch 11. At this time, since the distance between the locking limiting end 311 of the first locking piece 31 and the inner end surface of the latch 11 is small, the limiting end 210 of the limiting piece 21 is limited to enter the retraction path of the latch 11. Therefore, when the latch assembly 1 and the first locking piece 31 are completely reset, the limiting end 210 of the limiting piece 21 cannot enter the retraction path of the latch 11. At this time, the limiting unlocking surface 211 of the limiting piece 21 abuts against the locking limiting end 311 of the first locking piece 31, and the latch 11 is in the unlocking state.Loosen the handle, the second push piece 42 in the third reset spring 14 under the action of left move reset and push the first push part 412 counterclockwise rotation reset, because the first push part 412, the second push part 411 and the first dial plate 41 linkage, therefore, the first push part 412 counterclockwise rotation will also drive the first dial plate 41 and the second push part 411 rotation reset, the first push part 412 rotation push the first push piece 43 reset down.

[0065] Embodiment 2

[0066] The door lock provided by the embodiment, as shown in the drawings, comprises a lock housing 5 and a latch anti-insert theft opening structure arranged in the lock housing 5, and the latch anti-insert theft opening structure is the latch anti-insert theft opening structure of the embodiment 1. Figures 1 to 6 As an option, the door lock of the embodiment can also be provided with other common square tongue assemblies (not shown) in the prior art door locks, which are used in cooperation with the latch assembly 1 and are also within the protection scope of the present application.

[0067] Since the door lock of the embodiment comprises the above-mentioned latch anti-insert theft opening structure, the latch assembly 1 can be locked when the door is closed, and the objects entering from the door gap cannot push the latch assembly 1 back into the lock housing 5, which can effectively prevent theft and protect the safety of the person and property; at the same time, when the door is opened, the latch assembly 1 is in an unlocked state, and there is no need to unlock the latch assembly 1 through the handle when the door is closed, which is more convenient to use and prevents the damage to the door lock or the door frame caused by violent closing of the door.

[0068] Obviously, the above-mentioned embodiments are only examples for clearly illustrating, and are not the limitation of the embodiments. For those skilled in the art, other different forms of changes or variations can be made on the basis of the above-mentioned description. Here, it is not necessary and impossible to enumerate all the embodiments. The obvious changes or variations derived therefrom are still within the protection scope of the present application.

Claims

1. A latch anti-insertion opening structure, comprising: a latch assembly (1) comprising a latch (11) capable of extending out of or retracting into a lock housing (5); a limiting assembly (2) comprising a limiting member (21) rotatably mounted in the lock housing (5), and a limiting biasing member (22) providing a limiting end (210) of the limiting member (21) near the latch (11) with a retracting path movement towards the latch (11); an unlocking assembly (4) provided in the lock housing (5) in linkage with a handle, and pushing the limiting member (21) to rotate to move the limiting end (210) out of the retracting path of the latch (11); characterized in further comprising: a locking assembly (3) movably provided in the lock housing (5), having a locking state limiting the movement of the limiting member (21) to the retracting path of the latch (11) in a door opening state, and an unlocking state not limiting the movement of the limiting member (21) to the retracting path of the latch (11) in a door closing state; the locking assembly (3) having a locking abutting end (314) located on the retracting path of the latch (11), when closing the door, the latch (11) pushes the locking abutting end (314) to move, so that the locking assembly (3) moves from the locking state to the unlocking state; the locking assembly (3) comprising a first locking member (31), one end of the first locking member (31) being the locking abutting end (314), and the first locking member (31) having a locking limiting end (311) limiting the movement of the limiting member (21) to the retracting path of the latch (11) in the locking state and not limiting the movement of the limiting member (21) to the retracting path of the latch (11) in the unlocking state; the locking assembly (3) further comprising a second locking member (32) locking the first locking member (31) in the unlocking state and unlocking the first locking member (31) in the locking state; the second locking member (32) is provided in linkage with the handle, and is movably provided in the lock housing (5) and has a second movement biasing member (34) mounted thereon to deflect a second locking portion (321) of the second locking member (32) towards the first locking member (31), the first locking member (31) has a first locking portion (310) provided in cooperation with the second locking portion (321), the first locking portion (310) is a groove recessed inwardly of the first locking member (31), and the second locking portion (321) is a protrusion protruding outwardly of the second locking member (32), in the locking state, the protrusion abuts the outer side of the groove wall, and in the unlocking state, the protrusion extends into the groove and abuts the inner wall of the groove.

2. The anti-tamper opening latch structure of claim 1, wherein the reciprocating movement direction of the first locking member (31) is parallel to the movement path of the latch (11).

3. The tamper-resistant opening structure of the latch tongue according to claim 1, characterized in that The limiting member (21) has a limiting locking surface (212) abutting against the locking limiting end (311) in the locking state, and a limiting unlocking surface (211) abutting against the locking limiting end (311) in the unlocking state, the distance from the limiting locking surface (212) to the movement path of the latch (11) is less than the distance from the limiting unlocking surface (211) to the movement path of the latch (11), and the limiting locking surface (212) and the limiting unlocking surface (211) are smoothly connected.

4. The tamper-resistant opening structure of the latch tongue according to claim 1, characterized in that The locking assembly (3) further comprises a first movement biasing member (33) connected with the first locking member (31) and providing the first locking member (31) with movement in the direction of the extension of the latch (11).

5. The tamper-resistant opening structure of the latch tongue according to claim 1, characterized in that The second locking member (32) is rotatably arranged in the lock housing (5), and the second movement biasing member (34) is a torsion spring.

6. The anti-tamper opening latch structure of claim 5, wherein, The unlocking assembly (4) comprises a second abutting and pushing part (411) abutting against and pushing the unlocking part (322) on the second locking member (32) to move the second locking member (32) against the second movement biasing member (34).

7. The anti-tamper opening latch structure of claim 6, wherein, The second abutting and pushing part (411) is a protruding structure protruding in the direction of the extension of the latch (11) and towards the second locking member (32).

8. The anti-tamper opening latch structure of claim 6, wherein, The unlocking assembly (4) further comprises a first abutting and pushing member (43) controlled by a key to abut against and drive the second abutting and pushing part (411) to move the second locking member (32) against the second movement biasing member (34).

9. The anti-tamper opening latch structure of claim 8, wherein, The unlocking assembly (4) further comprises a first abutting and pushing part (412) connected with the handle, and the latch connecting rod (12) of the latch assembly (1) is slidably provided with a second abutting and pushing member (42), the first abutting and pushing part (412) rotates to push the second abutting and pushing member (42) to move and abut against the limiting member (21) to rotate the limiting end (210) out of the retraction path of the latch (11), and the first abutting and pushing part (412) is provided with the second abutting and pushing part (411).

10. A door lock comprising a lock housing and a dead bolt anti-pick opening structure disposed within the lock housing, characterized by, The latch anti-burglary opening structure is the latch anti-burglary opening structure according to any one of the preceding claims 1-9.

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