Square lock tongue anti-collision mechanism and door lock

Abstract

The present invention discloses a square lock tongue anti-collision mechanism and a door lock, wherein the square lock tongue anti-collision mechanism comprises a shell, a square lock tongue and a safety piece that can be retracted on one side of the shell, and a movable plug-in that is slidably installed in the shell; the safety piece is linked with the movable plug-in, and a groove is provided on the square lock tongue for one end of the movable plug-in to extend into, wherein when the safety piece is retracted to at least one side of the shell due to closing the door, the safety piece drives the movable plug-in to withdraw from the groove; when the safety piece is extended out of at least one side of the shell due to opening the door, the movable plug-in is reset and inserted into the groove. The square lock tongue anti-collision mechanism can prevent the square lock tongue from extending out of the lock body after the door is opened, thereby achieving an anti-collision effect. The square lock tongue anti-collision mechanism disclosed in the present invention can prevent the square lock tongue from extending out of the lock body after the door is opened, thereby avoiding the square lock tongue from being damaged by collision.

Description

Technical Field

[0001] The invention belongs to the technical field of locks, and in particular relates to a square lock tongue anti-collision mechanism and a door lock. Background Art

[0002] The Tiandi door lock is a lock that can lock the upper and lower brake pads of the door while closing the lock. Its working principle is as follows: when opening the door, use the key to open the lock cylinder, the square lock tongue retracts, press the handle down to a certain angle (such as 45°), the oblique tongue retracts, and the power rod drives the upper and lower brake pads to retract. The door is opened. After releasing the handle, the oblique tongue extends and the handle can return to its position; when locking the door, lift the handle to a certain angle (such as 45°), the power rod drives the upper and lower brake pads to extend, use the key or operate the hand button indoors to lock the lock cylinder, the square lock tongue also extends and locks, the door is locked, and after releasing the handle, the handle can return to its position. Since the door is restricted by the upper and lower brake pads, square lock tongue and oblique tongue at the same time when it is locked, it has better security.

[0003] However, after the door is opened, the existing home door locks such as the top and bottom door locks may easily cause the square lock tongue to partially extend or even completely extend from the lock body due to user misoperation, which may cause the square lock tongue to be damaged (for example, in windy weather, the door is closed by the wind, causing the square lock tongue to collide with the door frame). Summary of the invention

[0004] In order to overcome the above-mentioned shortcomings of the prior art, an object of the present invention is to provide a square lock tongue anti-collision mechanism, which can prevent the square lock tongue from extending from the lock body after the door is opened, thereby avoiding the square lock tongue from colliding and being damaged.

[0005] In order to achieve the purpose, the technical solution adopted by the present invention is as follows:

[0006] A square lock tongue anti-collision mechanism comprises a shell, a square lock tongue and a safety piece which can be retracted on one side of the shell, and a movable plug-in slidably installed in the shell; the safety piece is linked with the movable plug-in, and a groove is provided on the square lock tongue for one end of the movable plug-in to extend into, wherein when the safety piece is retracted to one side of the shell at least due to closing the door, the safety piece drives the movable plug-in to withdraw from the groove; when the safety piece is extended out of one side of the shell at least due to opening the door, the movable plug-in is reset and inserted into the groove.

[0007] Further, the movable plug-in comprises a slider and a first elastic member arranged along a direction perpendicular to the extension and contraction direction of the safety member, the two ends of the slider respectively have a force-bearing portion and a limiting portion that can be extended into the groove, one end of the first elastic member contacts the end surface of the force-bearing portion, and the other end contacts the inner wall of the shell; wherein a first notch is provided between the force-bearing portion and the limiting portion, and a force-bearing boss is formed on a side of the first notch close to the force-bearing portion;

[0008] The safety member includes a safety rod and a second elastic member arranged along its extension direction, the safety rod is elastically extended and retracted in one side of the shell through the second elastic member, the tail of the safety rod is placed in the first notch, and a second notch arranged toward the force-bearing boss is opened on the tail edge of the safety rod, wherein a force-bearing inclined surface inclined toward the extending direction of the safety rod is formed on one side of the second notch, and the force-bearing inclined surface is used to push the slider to slide in a direction away from the square lock tongue when the safety rod is retracted to one side of the shell, so that the limiting portion withdraws from the groove.

[0009] Furthermore, the head of the safety rod has an inclined surface arranged in the door closing direction, so that the head of the safety rod is compressed and retracted into one side of the housing when the door is closed.

[0010] Furthermore, the safety rod has a rod head and a force-bearing rod connected to the rod head, the second notch is provided on the edge of one end of the force-bearing rod away from the rod head, and a spring mounting surface is formed at the connection between the rod head and the force-bearing rod, wherein one end of the second elastic member contacts the spring mounting surface, and the other end contacts the inner wall of the shell.

[0011] Furthermore, a convex shaft is provided on the spring mounting surface, and the convex shaft extends into one end of the second elastic member, and the other end of the second elastic member contacts the inner wall of the shell.

[0012] Furthermore, a blind hole is provided on the end surface of the force-bearing portion, one end of the first elastic member extends into the blind hole, and the other end contacts the inner wall of the shell.

[0013] Furthermore, an unlocking block that can be driven by a key and a rotating block for driving the square lock tongue to extend and retract are also installed in the shell. The rotating block is transmission-connected to the unlocking block. A slide groove is provided on the square lock tongue. The rotating block has a lever that can slide along the slide groove. When the square lock tongue is fully extended out of one side of the shell, the lever abuts against the inner wall of the slide groove and forms an angle that can prevent the square lock tongue from retracting.

[0014] Furthermore, the lever is in an "L" shape, wherein one end portion of the lever is arranged opposite to the slide slot and extends toward the slide slot to form a sliding end, and the sliding end extends into the slide slot and can slide along the slide slot.

[0015] Furthermore, the unlocking shift block has a first gear portion, and the rotating shift block also has a second gear portion connected to the shift rod, wherein the first gear portion is meshed with the second gear.

[0016] Correspondingly, the present invention also provides a door lock, comprising the aforementioned square lock tongue anti-collision mechanism.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] The square lock tongue anti-collision mechanism proposed in the present invention provides a groove on the square lock tongue, adds a safety piece and a movable plug-in linked to the safety piece in the shell. In this way, on the one hand, after closing the door, the safety piece can be retracted to one side of the shell and drive one end of the movable plug-in to withdraw from the groove of the square lock tongue to achieve unlocking, so that the square lock tongue can normally extend out of the one side of the shell to lock the door, thereby ensuring the normal use of the square lock tongue; on the other hand, after the square lock tongue is retracted into the shell and the door is opened, the safety piece can extend out of one side of the shell, so that the movable plug-in is reset and inserted into the groove of the square lock tongue to lock, thereby making the square lock tongue stuck by one end of the movable plug-in and unable to extend out of the shell, thereby preventing the square lock tongue from being accidentally extended and damaged, which is beneficial to improving the service life of the door lock. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying any creative work.

[0020] Figure 1 This is a schematic diagram of the external structure of a door lock in one embodiment of the present invention;

[0021] Figure 2 It is a schematic diagram of the internal state of the lock tongue anti-collision mechanism in which the middle lock tongue extends forward in one embodiment of the present invention;

[0022] Figure 3 for Figure 2 A front view of

[0023] Figure 4 It is a schematic diagram of the internal state of the lock tongue anti-collision mechanism after the middle lock tongue extends out in one embodiment of the present invention;

[0024] Figure 5 for Figure 4A front view of

[0025] Figure 6 It is a schematic structural diagram of a middle lock tongue in one embodiment of the present invention;

[0026] Figure 7 A schematic diagram of the structure of an active plug-in in an embodiment of the present invention;

[0027] Figure 8 It is a structural schematic diagram of a safety element in one embodiment of the present invention;

[0028] Fig. 9 Schematic diagram of the structure of a rotary shift block in one embodiment of the present invention.

[0029] Description of reference numerals:

[0030] 1-shell, 2-square lock tongue, 21-slide groove, 22-groove, 3-safety piece, 31-second elastic piece, 32-safety rod, 321-rod head, 3211-inclined surface, 322-force rod, 3221-force inclined surface, 3222-second notch, 33-convex shaft, 4-movable plug-in, 41-slider, 411-force part, 4111-force boss, 4112-blind hole, 412-limiting part, 413-first notch, 42-first elastic piece, 5-unlocking dial block, 51-first gear part, 6-rotating dial block, 61-dial rod, 611-sliding end, 62-second gear part. DETAILED DESCRIPTION

[0031] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. In the following description, many specific details are set forth in order to fully understand the present invention, and the embodiments described are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present invention.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0033] Reference Figure 1 , Figure 2 , Figure 4 , Figure 6 , Figure 7 and Figure 8The embodiment of the present invention provides a square lock tongue anti-collision mechanism, comprising a shell 1, a square lock tongue 2 and a safety piece 3 which can be retracted on one side of the shell 1, and a movable plug-in 4 which is slidably installed in the shell 1; the safety piece 3 is linked with the movable plug-in 4, and a groove 22 is provided on the square lock tongue 2 for one end of the movable plug-in 4 to extend into (illustratively, the groove 22 is provided on one side edge of the square lock tongue 2 close to the safety piece 3), wherein, when the safety piece 3 is retracted to at least one side of the shell 1 due to closing the door, the safety piece 3 drives the movable plug-in 4 to withdraw from the groove 22; when the safety piece 3 is extended out of at least one side of the shell 1 due to opening the door, the movable plug-in 4 is reset and inserted into the groove 22.

[0034] The square lock tongue anti-collision mechanism of the present embodiment is provided with a groove 22 on the square lock tongue 2, a safety piece 3 and an active plug-in unit 4 linked with the safety piece 3 in the housing 1. In this way, on the one hand, after closing the door, the safety piece 3 can be retracted to one side of the housing 1 and drive one end of the active plug-in unit 4 to withdraw from the groove 22 of the square lock tongue 2 to achieve unlocking, so that the square lock tongue 2 can normally extend out of one side of the housing 1 to lock the door, thereby ensuring the normal use of the square lock tongue 2; on the other hand, after the square lock tongue 2 is retracted into the housing 1 and the door is opened (when opening the door, the user will first use a key or operate a hand button indoors to retract the square lock tongue 2 into the housing 1), the safety piece 3 can extend out of one side of the housing 1, so that the active plug-in unit 4 is reset and inserted into the groove 22 of the square lock tongue 2 to lock, thereby making the square lock tongue 2 stuck by one end of the active plug-in unit 4 and unable to extend out of the housing 1, thereby preventing the square lock tongue 2 from accidentally extending out (such as accidentally turning the key to make the square lock tongue 2 accidentally extend out) and causing it to be damaged, which is beneficial to improving the service life of the door lock.

[0035] Further, refer to Figures 2 to 8In an exemplary embodiment, the movable plug-in 4 includes a slider 41 and a first elastic member 42 arranged along a direction perpendicular to the extension and contraction direction of the safety member 3, and the two ends of the slider 41 respectively have a force-bearing portion 411 and a limiting portion 412 that can be extended into the groove 22, one end of the first elastic member 42 contacts the end surface of the force-bearing portion 411, and the other end contacts the inner wall of the shell 1; wherein a first notch 413 is provided between the force-bearing portion 411 and the limiting portion 412, and a force-bearing boss 4111 is formed on one side of the first notch 413 close to the force-bearing portion 411; the safety member 3 includes a safety rod 3 arranged along its extension and contraction direction 2 and a second elastic member 31, the safety rod 32 is elastically retracted in one side of the housing 1 through the second elastic member 31, the tail of the safety rod 32 is placed in the first notch 413, and a second notch 3222 arranged toward the force-bearing boss 4111 is opened on the tail edge of the safety rod 32, wherein a force-bearing inclined surface 3221 inclined toward the extension direction of the safety rod 32 is formed on one side of the second notch 3222, and the force-bearing inclined surface 3221 is used to push the slider 41 to slide in a direction away from the square lock tongue 2 when the safety rod 32 is retracted to one side of the housing 1, so that the limiting portion 412 withdraws from the groove 22. The first elastic member 42 and the second elastic member 31 can be elastic objects such as springs, shrapnel, rubber bands, etc., as long as they can meet the use requirements, and this embodiment does not make specific restrictions on this. Schematically, the first elastic member 42 and the second elastic member 31 are both pressure springs.

[0036] In this embodiment, based on the above-mentioned structural design, after the square lock tongue 2 is retracted into the shell body 1 and the door is opened, the safety rod 32 can extend out of one side of the shell body 1, and the slider 41 is reset under the action of the first elastic member 42 so that the limiting portion 412 can be inserted into the groove 22 of the square lock tongue 2 for locking, so that the square lock tongue 2 is stuck by the limiting portion 412 and cannot extend out of the shell body 1; on the other hand, after closing the door, the safety rod 32 can be retracted into one side of the shell body 1 and drive the limiting portion 412 of the slider 41 to withdraw from the groove 22 of the square lock tongue 2 to achieve unlocking, so that the square lock tongue 2 can normally extend out of one side of the shell body 1 to lock the door.

[0037] Further, refer to Figures 2 to 8 In an exemplary embodiment, the head of the safety lever 32 has an inclined surface 3211 arranged in the door closing direction, so that the head of the safety lever 32 is compressed and retracted into one side of the housing 1 when the door is closed. Illustrated, the head of the safety lever 32 is triangular and has two inclined surfaces 3211.

[0038] In this embodiment, based on the above structural design, when the door is closed, when the head of the safety rod 32 contacts the edge of the corresponding door frame or another door, the head of the safety rod 32 retracts into one side of the shell 1 due to pressure, so that the safety rod 32 can drive the limiting portion 412 of the slider 41 to withdraw from the groove 22 of the square lock tongue 2 to unlock the other side lock tongue 2; and when the door is opened, when the head of the safety rod 32 is separated from the edge of the corresponding door frame or another door, under the action of the elastic restoring force of the second elastic member 31, the head of the safety rod 32 can extend out of one side of the shell 1, so that the limiting portion 412 of the slider 41 can be inserted into the groove 22 of the square lock tongue 2 to clamp the square lock tongue 2, so that the square lock tongue 2 cannot be extended.

[0039] Further, refer to Figures 2 to 8 In an exemplary embodiment, the safety rod 32 has a rod head 321 and a force rod 322 connected to the rod head 321, a second notch 3222 is provided on the edge of one end of the force rod 322 away from the rod head 321, and a spring mounting surface (not shown in the figure) is formed at the connection between the rod head 321 and the force rod 322, wherein one end of the second elastic member 31 contacts the spring mounting surface, and the other end contacts the inner wall of the housing 1. Illustratively, the rod head 321 is triangular, and of course in some other embodiments, the rod head 321 may also be conical or truncated cone, as long as the desired effect can be achieved, and this embodiment does not impose any specific restrictions on this.

[0040] In this embodiment, based on the above structural design, the safety rod 32 can be elastically retracted in one side of the housing 1 .

[0041] Further, refer to Figure 2 , Figure 4 and Figure 8 In an exemplary embodiment, a convex shaft 33 is provided on the spring mounting surface, and the convex shaft 33 extends into one end of the second elastic member 31, and the other end of the second elastic member 31 contacts the inner wall of the housing 1. In this way, the stability of the extension and retraction of the second elastic member 31 is improved, so that the extension and retraction of the safety rod 32 can be more stable.

[0042] Further, refer to Figure 3 and Figure 7 In an exemplary embodiment, a blind hole 4112 is provided on the end surface of the force-bearing portion 411, one end of the first elastic member 42 extends into the blind hole 4112, and the other end contacts the inner wall of the housing 1. This is conducive to improving the stability of the expansion and contraction of the first elastic member 42, so that the movement of the slider 41 can be more stable.

[0043] Further, refer to Figure 4 , Figure 5 , Figure 6 and Fig. 9In an exemplary embodiment, an unlocking block 5 driven by a key and a rotating block 6 for driving the square lock tongue 2 to extend and retract are also installed in the housing 1. The rotating block 6 is transmission-connected to the unlocking block 5. A slide groove 21 is provided on the square lock tongue 2 (illustratively, the length direction of the slide groove 21 is perpendicular to the extension and retraction direction of the square lock tongue 2). The rotating block 6 has a lever 61 that can slide along the slide groove 21. When the square lock tongue 2 is fully extended out of one side of the housing 1, the lever 61 abuts against the inner wall of the slide groove 21 and forms an angle that can prevent the square lock tongue 2 from retracting (illustratively, the angle formed between the lever 61 and the slide groove 21 is a right angle at this time).

[0044] In this embodiment, based on the above structural design, not only can the square tongue be retracted in one side of the shell 1, but also when the square lock tongue 2 is fully extended out of one side of the shell 1, the lever 61 can abut against the inner wall of the slide groove 21 and form a 90° dead angle with the slide groove 21. In this way, the square lock tongue 2 can be prevented from being maliciously pried back into the shell 1 after being extended, thereby effectively improving the safety of the door lock.

[0045] Further, refer to Figure 4 , Figure 5 , Figure 6 and Fig. 9 In an exemplary embodiment, the lever 61 is L-shaped, wherein one end of the lever 61 is arranged opposite to the slide groove 21 and extends toward the slide groove 21 to form a sliding end 611, and the sliding end 611 extends into the slide groove 21 and can slide along the slide groove 21.

[0046] In this embodiment, based on the above structural design, the lever 61 can drive the square lock tongue 2 to extend or retract into the housing 1 during the process of sliding back and forth along the slide groove 21, and the structure is simple and ingenious.

[0047] Further, refer to Figure 2 , Figure 3 , Figure 4 , Figure 5 and Fig. 9 In an exemplary embodiment, the unlocking block 5 has a first gear portion 51, and the rotating block 6 also has a second gear portion 62 connected to the lever 61 (illustratively, the lever 61 and the second gear portion 62 are connected and form an integral body), wherein the first gear portion 51 meshes with the second gear. Illustrated, the first gear portion 51 is provided with a rectangular reserved hole (not shown in the figure) for key insertion, wherein, in an actual application scenario, the rectangular reserved hole faces the side outdoors, and is provided for key insertion, so that the user can open / close the square lock tongue 2 by the key outdoors to lock or open the door; and the rectangular reserved hole faces the side indoors, and can be matched with a hand button, so that the user can open / close the square lock tongue 2 by the hand button indoors to lock or open the door.

[0048] In this embodiment, based on the above-mentioned structural design, a transmission connection is realized between the rotating dial block 6 and the unlocking dial block 5, so that when the unlocking dial block 5 is rotated by using a key, the rotating dial block 6 can drive the lever 61 to rotate synchronously, so that while the lever 61 rotates, its sliding end 611 can slide back and forth along the slide groove 21 to drive the square lock tongue 2 to extend or retract into the shell 1.

[0049] Correspondingly, an embodiment of the present invention further provides a door lock, comprising the square lock tongue anti-collision mechanism in any of the above embodiments.

[0050] In this embodiment, thanks to the improvement of the square lock tongue anti-collision mechanism, the door lock of this embodiment has the same technical effect as the square lock tongue anti-collision mechanism, which will not be described in detail here. It should be noted that the door lock of this embodiment can be a type of lock such as a floor door lock, and this embodiment does not make any specific restrictions on this.

[0051] In order to facilitate a more comprehensive understanding of the square bolt anti-collision mechanism disclosed in the present invention, the working principle thereof is described below by taking a more specific embodiment as an example:

[0052] Reference Figures 1 to 9When locking the door, when the rod head 321 of the safety rod 32 contacts the edge of the corresponding door frame or another door, the rod head 321 of the safety rod 32 is partially retracted into one side of the shell 1 due to pressure. In the process of the safety rod 32 retracting into the shell 1, the second elastic member 31 is compressed, and the force-bearing inclined surface 3221 contacts and pushes the force-bearing boss 4111, so that the first elastic member 42 is compressed. At the same time, the limiting portion 412 of the slider 41 withdraws from the groove 22 of the square lock tongue 2 to unlock the other lock tongue 2. Then, the unlocking dial block 5 can be turned by the key, and the unlocking dial block 5 drives the rotation The dial block 6 rotates, and during the rotation of the rotating dial block 6, the lever 61 slides from the end of the slide groove 21 away from the lock dial block 5 to the other end of the slide groove 21 close to the unlocking dial block 5. During the sliding of the lever 61 along the slide groove 21, the lever 61 pushes the inner wall of one side of the slide groove 21, so that the square lock tongue 2 slides outward and gradually extends out of one side of the shell 1. When the square lock tongue 2 is completely extended out of one side of the shell 1, the door locking action is completed. At this time, the lever 61 abuts against the inner wall of the slide groove 21 and forms a 90° dead angle with the slide groove 21, so that the other lock tongue 2 is stuck; when opening the door, the key can be used to turn the open key. The lock dial block 5 and the unlocking dial block 5 drive the rotating dial block 6 to rotate. During the rotation of the rotating dial block 6, the lever 61 slides from one end of the slide slot 21 close to the unlocking dial block 5 to the other end of the slide slot 21 away from the lock dial block 5. During the sliding of the lever 61 along the slide slot 21, the lever 61 pushes the inner wall of the other side of the slide slot 21, so that the square lock tongue 2 slides inward and gradually retracts to one side of the shell 1. When the square lock tongue 2 is fully retracted to one side of the shell 1, the groove 22 is arranged opposite to the limiting portion 412 of the slider 41; when the square lock tongue 2 is fully retracted to one side of the shell 1 and the door is opened, the rod head 3 of the safety rod 32 is 21 is separated from the corresponding door frame or the edge of another door. At this time, under the action of the elastic restoring force of the second elastic member 31, the rod head 321 of the safety rod 32 can be completely extended out of one side of the shell body 1. In the process of the safety rod 32 extending out of the shell body 1, the force-bearing boss 4111 gradually gets rid of the restriction of the force-bearing inclined surface 3221, and under the push of the elastic restoring force of the first elastic member 42, the limiting portion 412 of the slider 41 is inserted into the groove 22 of the square lock tongue 2 to clamp the square lock tongue 2, so that the square lock tongue 2 cannot be extended, thereby preventing the square lock tongue 2 from being accidentally extended and damaged, which is beneficial to improving the service life of the door lock.

[0053] In addition, it should be noted that the other contents of the square lock tongue anti-collision mechanism and the door lock disclosed in the present invention can be referred to the prior art and will not be described in detail here.

[0054] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Therefore, any modification, equivalent change and modification made to the above embodiment according to the technical essence of the present invention without departing from the technical solution of the present invention shall still fall within the scope of the technical solution of the present invention.

Claims

1. A square lock tongue anti-collision mechanism, characterized in that: The invention comprises a housing, a square lock tongue and a safety member which can be extended and retracted on one side of the housing, and a movable plug-in which is slidably installed in the housing; the safety member is linked with the movable plug-in, and a groove is provided on the square lock tongue for one end of the movable plug-in to extend into, wherein when the safety member is retracted to at least one side of the housing due to closing the door, the safety member drives the movable plug-in to withdraw from the groove; when the safety member is extended to at least one side of the housing due to opening the door, the movable plug-in is reset and inserted into the groove; The movable plug-in comprises a slider and a first elastic member arranged along a direction perpendicular to the extension and contraction direction of the safety member, the two ends of the slider respectively have a force-bearing portion and a limiting portion that can be extended into the groove, one end of the first elastic member contacts the end surface of the force-bearing portion, and the other end contacts the inner wall of the shell; wherein a first notch is provided between the force-bearing portion and the limiting portion, and a force-bearing boss is formed on a side of the first notch close to the force-bearing portion; The safety member comprises a safety rod and a second elastic member arranged along the extension direction thereof, the safety rod is elastically extended and retracted in one side of the shell through the second elastic member, the tail of the safety rod is placed in the first notch, and a second notch arranged toward the force-bearing boss is opened on the tail edge of the safety rod, wherein a force-bearing inclined surface inclined toward the extension direction of the safety rod is formed on one side of the second notch, and the force-bearing inclined surface is used to push the slider to slide in a direction away from the square lock tongue when the safety rod is retracted to one side of the shell, so that the limiting portion withdraws from the groove; The housing is also provided with an unlocking block that can be driven by a key and a rotating block for driving the square lock tongue to extend and retract. The rotating block is in transmission connection with the unlocking block. A sliding groove is provided on the square lock tongue. The rotating block has a lever that can slide along the sliding groove. When the square lock tongue is fully extended out of one side of the housing, the lever abuts against the inner wall of the sliding groove and forms an angle that can prevent the square lock tongue from retracting. The unlocking block has a first gear portion, and the rotating block also has a second gear portion connected to the lever, wherein the first gear portion is meshed with the second gear portion, and the first gear portion is provided with a rectangular reserved hole for inserting a key.

2. The square bolt anti-collision mechanism according to claim 1, characterized in that: The head of the safety rod is provided with an inclined surface arranged in the door closing direction, so that the head of the safety rod is compressed and retracted into one side of the shell when the door is closed.

3. The square bolt anti-collision mechanism according to claim 1, characterized in that: The safety rod has a rod head and a force-bearing rod connected to the rod head, the second notch is provided on the edge of one end of the force-bearing rod away from the rod head, and a spring mounting surface is formed at the connection between the rod head and the force-bearing rod, wherein one end of the second elastic member contacts the spring mounting surface, and the other end contacts the inner wall of the shell.

4. The square bolt anti-collision mechanism according to claim 3, characterized in that: A convex shaft is provided on the spring mounting surface, and the convex shaft extends into one end of the second elastic member, and the other end of the second elastic member contacts the inner wall of the shell.

5. The square bolt anti-collision mechanism according to claim 1, characterized in that: A blind hole is provided on the end surface of the force-bearing portion, one end of the first elastic member extends into the blind hole, and the other end contacts the inner wall of the shell.

6. The square bolt anti-collision mechanism according to claim 1, characterized in that: The lever is in an "L" shape, wherein one end of the lever is arranged opposite to the slide slot and extends toward the slide slot to form a sliding end, and the sliding end extends into the slide slot and can slide along the slide slot.

7. A door lock, characterized in that: It comprises a square lock tongue anti-collision mechanism as claimed in any one of claims 1 to 6.

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