Linkage locking door lock

Abstract

The utility model discloses a linkage locking door lock which comprises an end face seat piece, a lock shell, a driving rotating shaft, an inclined tongue and an inclined tongue spring used for pushing the inclined tongue to stretch out of the end face seat piece. The end of the locking base piece is provided with an end limiting part used for limiting and locking the inner side end of the latch bolt and a latch bolt avoiding notch, the driving rotating shaft is sleeved with a locking driving piece in a limiting mode, the locking driving piece is provided with a locking driving pin shaft, and the locking base piece is further provided with a locking driving notch used for being matched with the locking driving pin shaft. The end limiting part and the latch bolt avoiding notch are arranged on the locking seat piece, when the locking seat piece moves to the locking position, the end limiting part moves to the inner side end of the latch bolt, and retraction of the latch bolt is limited; and for a door lock only provided with an indoor handle, the latch bolt can be effectively locked, and external personnel cannot shift the latch bolt to retract through tools such as a card, so that the locking safety performance of the door lock is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of door locks, in particular to a linkage locking door lock. Background Technique

[0002] As the name implies, a door lock is a device used to lock a door to prevent others from opening it. There are many classifications of door locks, and the requirements for door locks in various occasions are different. Ordinary families generally use anti-theft door locks, which are highly secure and relatively inexpensive. Some door locks are based on the bevel tongue and square tongue with the function of locking the door body, and also have an upper locking part and a lower locking part added. While the bevel tongue and square tongue lock the door body, the upper locking part and the lower locking part are simultaneously locked to the door body through the linkage mechanism of the lock to improve the anti-theft and anti-prying performance of the door body.

[0003] For example, the utility model patent with the authorization publication number of CN212054138U discloses a reset structure of the handle linkage of a door lock. In the above solution, there is a certain distance between the upper linkage wall and the lower linkage wall to avoid simultaneous contact with the linkage pin. Moreover, the inclined upper linkage wall and lower linkage wall have a guiding function on the one hand, and on the other hand, enable the locking linkage to move a larger range under the push of the linkage pin.

[0004] However, the above technical solution only discloses the reset structure of the linkage, and does not disclose the further locking structure of the bevel tongue and the square tongue. In the prior art, if the bevel surface of the bevel tongue of the door lock faces the outside, external personnel can use tools such as cards to move the bevel tongue, causing the bevel tongue to retract, thereby prying open the door lock, and the security is insufficient. How to perform linkage locking on the bevel tongue is the technical problem to be solved in this application. Content of the Utility Model

[0005] The purpose of the utility model is to provide a linkage locking door lock to solve the problems raised in the above background technique.

[0006] To achieve the above purpose, the utility model provides the following technical solutions:

[0007] A linkage locking door lock includes an end face seat piece, a lock case, a driving rotating shaft, an inclined tongue, and an inclined tongue spring for pushing the inclined tongue to extend out of the end face seat piece. The inner end of the inclined tongue extends with an inclined tongue slide rod, and an inclined tongue pin shaft is arranged on the inclined tongue slide rod. A toggle arm for pushing the inclined tongue pin shaft to retract is limitedly sleeved on the driving rotating shaft. A locking seat piece is also slidably installed in the lock case. The end of the locking seat piece has an end limit portion for limiting and locking the inner end of the inclined tongue and an inclined tongue avoidance notch. A locking driving piece is limitedly sleeved on the driving rotating shaft, and a locking driving pin shaft is arranged on the locking driving piece. A locking driving notch for cooperating with the locking driving pin shaft is also arranged on the locking seat piece; The locking seat piece has a locking position and an unlocking position in its own sliding direction. When the locking seat piece moves to the locking position, the end limit portion moves to the inner end of the inclined tongue to limit the retraction of the inclined tongue; When the locking seat piece moves to the unlocking position, the inclined tongue avoidance notch moves to the inner end of the inclined tongue to allow the inclined tongue to retract.

[0008] As a further scheme of the utility model, a spring damping component is also fixedly installed in the lock case. The locking seat piece is provided with a locking position damping hole corresponding to the locking position and an unlocking position damping hole corresponding to the unlocking position. The spring damping component includes a spring damping sleeve, a damping spring is arranged in the spring damping sleeve, and the outer end of the damping spring pushes a damping ball to make it abut against the locking seat piece, the locking position damping hole or the unlocking position damping hole. The spring damping component can enable the locking seat piece to stay more accurately in the locking position and the unlocking position.

[0009] As a further scheme of the utility model, end guiding covers are fixedly installed at both the upper and lower ends of the end face seat piece, and end sliding pieces are respectively clamped at both ends of the locking seat piece, and the end sliding pieces are respectively slidably matched in the end guiding covers.

[0010] As a further scheme of the utility model, the lock case is assembled by a pair of half shell bodies. A pair of guiding cover clamping portions extend on the end guiding cover, and the end of the half shell body has a guiding cover clamping groove for cooperating with the guiding cover clamping portion. The end guiding cover can be fixed to the end face seat piece by screws, and the lock case can be assembled by the cooperation between the guiding cover clamping portion and the guiding cover clamping groove of the end guiding cover without additional screws to lock the lock case, and the assembly of the lock case is relatively more convenient.

[0011] As a further scheme of the utility model, an inclined tongue guide seat is fixedly installed in the lock case, the inclined tongue slide rod is movably and cooperatively inserted in the inclined tongue guide seat, the inclined tongue spring is arranged in the inclined tongue guide seat, and the end of the inclined tongue spring abuts against the end face of the inclined tongue slide rod.

[0012] As a further scheme of the utility model, a reset tooth piece is also limitedly sleeved on the driving rotating shaft, a reset rack for cooperating with the reset tooth piece is also arranged near the edge of the lock case inside the lock case, and a reset torsion spring for cooperating with the end of the reset rack is also installed in the lock case;

[0013] A limiting piece is further arranged inside the lock housing. An arc notch for cooperating with the driving rotating shaft is formed on the limiting piece. One end of the limiting piece is clamped with a first limiting vertical piece inside the lock housing, and the other end is clamped with the oblique tongue guide seat. A sliding channel is formed between the side of the limiting piece far from the driving rotating shaft and the edge of the lock housing, and the reset rack is slidably fitted in the sliding channel.

[0014] As a further scheme of the present utility model, a square tongue seat piece is also slidably fitted and installed transversely inside the lock housing. A square tongue for protruding from the end face seat piece is installed at the outer side end of the square tongue seat piece. A square tongue driving notch is further arranged at the inner side end of the square tongue seat piece. A square tongue limiting pin is also fixedly installed on the square tongue seat piece. A secondary locking notch for cooperating with the square tongue limiting pin is also arranged on the locking seat piece.

[0015] As a further scheme of the present utility model, a square tongue locking piece is also slidably fitted and installed longitudinally inside the lock housing. A pair of longitudinal strip grooves are formed on the square tongue locking piece. A short pin shaft and a long pin shaft are fixedly installed inside the lock housing. The short pin shaft and the long pin shaft are respectively slidably fitted with the corresponding longitudinal strip grooves. A transverse strip groove is also formed on the square tongue seat piece, and the transverse strip groove is slidably fitted with the long pin shaft; a locking hook part extends from the square tongue locking piece. An extending notch and a retracting notch for cooperating with the locking hook part are formed on the square tongue seat piece.

[0016] As a further scheme of the present utility model, an inserting piece also extends from the end of the square tongue locking piece. The inserting piece is slidably inserted into a third limiting vertical piece inside the lock housing. A locking spring is also sleeved on the inserting piece. One end of the locking spring abuts against the square tongue locking piece, and the other end abuts against the third limiting vertical piece.

[0017] Compared with the prior art, the beneficial effects of the present utility model are as follows: An end limiting part and an oblique tongue avoidance notch are arranged on the locking seat piece of the present utility model. When the locking seat piece moves to the locking position, the end limiting part moves to the inner side end of the oblique tongue to limit the retraction of the oblique tongue; when the locking seat piece moves to the unlocking position, the oblique tongue avoidance notch moves to the inner side end of the oblique tongue to allow the oblique tongue to retract. For a door lock only with an indoor handle, the oblique tongue can be effectively locked, and external personnel cannot move the oblique tongue to retract through tools such as a card, thus ensuring the safety performance of the door lock locking. Description of the Drawings

[0018] Figure 1 It is a schematic three-dimensional assembled structure diagram of a linkage locking door lock;

[0019] Figure 2 It is a schematic three-dimensional disassembled structure diagram of a linkage locking door lock;

[0020] Figure 3 It is a schematic enlarged structure diagram at Figure 2 A of a linkage locking door lock;

[0021] Figure 4 It is a schematic side view of a linkage locking door lock;

[0022] Figure 5 It is a linkage locking door lock in Figure 4 The schematic structural view of the B-B section;

[0023] Figure 6 It is an enlarged three-dimensional structural view of the middle part of a linkage locking door lock;

[0024] Figure 7 It is a disassembled structural view of the square tongue locking piece and the square tongue seat piece in a linkage locking door lock.

[0025] In the figure: 1 - end face seat piece, 11 - lock shell, 12 - end part guide cover, 121 - guide cover clamping part, 122 - guide cover clamping groove, 13 - end part sliding piece, 14 - limiting vertical piece three, 15 - limiting vertical piece one, 16 - limiting vertical piece two, 2 - square tongue, 21 - square tongue seat piece, 22 - transverse strip groove, 23 - square tongue limiting pin, 24 - square tongue driving notch, 25 - extending notch, 26 - retracting notch, 3 - inclined tongue, 31 - inclined tongue sliding rod, 32 - inclined tongue guide seat, 33 - inclined tongue spring, 34 - inclined tongue pin shaft, 4 - driving rotating shaft, 41 -, 42 - locking driving piece, 421 - locking driving pin shaft, 43 - reset tooth piece, 431 - reset rack, 432 - reset torsion spring, 5 - locking seat piece, 51 - end part limiting part, 52 - inclined tongue avoiding notch, 53 - locking driving notch, 54 - secondary locking notch, 55 - locking position damping hole, 56 - unlocking position damping hole, 6 - square tongue locking piece, 61 - short pin shaft, 62 - long pin shaft, 63 - inserting piece, 64 - locking spring, 65 - longitudinal strip groove, 66 - locking hook part, 7 - spring damping component, 71 - spring damping sleeve, 72 - damping spring, 73 - damping ball. Specific embodiments

[0026] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0027] Please refer to Figures 1 to 7The utility model provides a technical solution: a linkage locking door lock, comprising an end seat 1, a lock housing 11, a driving shaft 4, a latch bolt 3, and a latch bolt spring 33 for pushing the latch bolt 3 out of the end seat 1, a latch bolt slide rod 31 extending from the inner side of the latch bolt 3, a latch bolt pin 34 being arranged on the latch bolt slide rod 31, a toggle arm 44 for pushing the latch bolt pin 34 to retract being provided on the upper limit sleeve of the driving shaft 4, and in a natural state, the latch bolt spring 33 is under the action of its own elastic force. The locking seat 5 is also slidably mounted in the lock housing 11, and the end of the locking seat 5 has an end limit portion 51 and a slant tongue avoidance notch 52 for limiting and locking the inner end of the slant tongue 3. The upper limit sleeve of the driving shaft 4 is provided with a locking drive plate 42, and the locking drive plate 42 has a locking drive pin 421. The locking seat 5 is also provided with a locking drive notch 53 for cooperating with the locking drive pin 421.

[0028] The locking seat 5 has a locking position and an unlocking position in its own sliding direction. When the locking seat 5 moves to the locking position, the end limit portion 51 moves to the inner side of the inclined tongue 3 to limit the retraction of the inclined tongue 3; when the locking seat 5 moves to the unlocking position, the inclined tongue avoidance notch 52 moves to the inner side of the inclined tongue 3 to allow the inclined tongue 3 to retract. In order to cooperate with the driving element, the driving shaft 4 can be specifically provided with a square slot, and the driving element can be a manual handle or an electric motor.

[0029] The working principle of the utility model is as follows: when the driving shaft 4 rotates, the driving shaft 4 will synchronously drive the locking driving plate 42 and the toggle arm 44 to swing, and the locking driving pin 421 on the locking driving plate 42 will first push the locking driving notch 53, so that the locking seat plate 5 slides to the unlocking position, and then the end limit portion 51 is staggered with the inner end of the inclined tongue 3, and the inclined tongue avoidance notch 52 corresponds to the inner end of the inclined tongue 3, and then, the toggle arm 44 contacts the inclined tongue pin 34, and as the driving shaft 4 continues to rotate, the toggle arm 44 overcomes the elastic force of the inclined tongue spring 33 to push the inclined tongue pin 34 and the inclined tongue 3, so that the inclined tongue 3 is retracted into the lock housing 11.

[0030] The locking seat 5 of the utility model is provided with an end limit portion 51 and a latch bolt avoidance notch 52. When the locking seat 5 moves to the locking position, the end limit portion 51 moves to the inner end of the latch bolt 3 to restrict the latch bolt 3 from retracting. When the locking seat 5 moves to the unlocking position, the latch bolt avoidance notch 52 moves to the inner end of the latch bolt 3 to allow the latch bolt 3 to retract. For a door lock with only an indoor handle, the latch bolt 3 can be effectively locked, and an outsider cannot retract the latch bolt 3 by using a card or other tool, thereby ensuring the safety performance of the door lock.

[0031] In order to enable the locking seat piece 5 to stay more accurately at the locking position and the unlocking position, a spring damping assembly 7 is fixedly installed in the lock housing 11. The locking seat piece 5 is provided with a locking position damping hole 55 corresponding to the locking position and an unlocking position damping hole 56 corresponding to the unlocking position. The spring damping assembly 7 includes a spring damping sleeve 71. A damping spring 72 is arranged in the spring damping sleeve 71. The outer end of the damping spring 72 pushes a damping ball 73 to make it abut against the locking seat piece 5, the locking position damping hole 55 or the unlocking position damping hole 56. Under the action of the damping spring 72, the damping ball 73 can be used to abut and fit in the locking position damping hole 55 and the unlocking position damping hole 56, so that the locking seat piece 5 can accurately stay at the locking position and the unlocking position.

[0032] In order to ensure that the locking seat piece 5 can slide flexibly inside the lock housing 11, end guiding covers 12 are fixedly installed at both the upper and lower ends of the end face seat piece 1. End sliders 13 are respectively clamped at both ends of the locking seat piece 5, and the end sliders 13 are respectively slidably fitted in the end guiding covers 12.

[0033] In order to facilitate the combined assembly of the lock housing 11 and the end face seat piece 1, the lock housing 11 is assembled by a pair of half shells. A pair of guide cover clamping parts 121 extend from the end guiding cover 12, and the end of the half shell has a guide cover clamping groove 122 for cooperating with the guide cover clamping part 121. In specific applications, the end guiding cover 12 can be fixed to the end face seat piece 1 by screws, and the lock housing 11 can be assembled by the cooperation between the guide cover clamping part 121 and the guide cover clamping groove 122 of the end guiding cover 12, and the lock housing 11 can be assembled without additional screws for locking the lock housing 11.

[0034] As a specific solution, in order to guide the protrusion or retraction of the oblique tongue 3 well, an oblique tongue guide seat 32 is fixedly installed in the lock housing 11. The oblique tongue slide rod 31 is movably fitted and inserted in the oblique tongue guide seat 32. The oblique tongue spring 33 is arranged in the oblique tongue guide seat 32, and the end of the oblique tongue spring 33 abuts against the end face of the oblique tongue slide rod 31.

[0035] Obviously, in order to enable the driving shaft 4 to automatically reset, in the present embodiment, the driving shaft 4 is also provided with a reset tooth piece 43, and a reset rack 431 for cooperating with the reset tooth piece 43 is also provided at the retaining edge near the lock housing 11 itself, and a reset torsion spring 432 for cooperating with the end of the reset rack 431 is also installed in the lock housing 11; after the driving shaft 4 is released, the reset torsion spring 432 can push the reset rack 431 to reset, and the reset rack 431 drives the reset tooth piece 43 and the driving shaft 4 in turn, so that the driving shaft 4 can be reset, and in the process of resetting the driving shaft 4, the toggle arm 44 will disengage from the oblique tongue pin 34, and the oblique tongue 3 will continue to extend out of the end surface seat plate 1 under the action of the oblique tongue spring 33, and the locking drive pin 421 on the locking drive plate 42 will also drive the locking seat plate 5 to move to the locking position.

[0036] In order to enable the reset rack 431 to slide flexibly and avoid the reset tooth piece 43 and the reset rack 431 from getting stuck in motion, a limit plate 41 is further provided inside the lock housing 11. The limit plate 41 has an arc notch for cooperating with the drive shaft 4. One end of the limit plate 41 is clamped with a limit vertical plate 15 in the lock housing 11, and the other end is clamped with the oblique tongue guide seat 32. A sliding channel is formed between the side of the limit plate 41 away from the drive shaft 4 and the retaining edge of the lock housing 11. The reset rack 431 slides in the sliding channel. The assembly structure of the limit plate 41 is reasonably designed, so that the reset rack 431 can slide flexibly and effectively avoid getting stuck. In addition, a limit vertical plate 2 16 is also installed in the lock housing 11. The limit vertical plate 2 16 is used to limit the locking seat 5 to avoid excessive movement of the locking seat 5 during the resetting process, and ensure that the locking seat 5 can be stably docked in the locking position.

[0037] As a further solution, in some scenarios, the door lock is provided with door handles corresponding to both indoor and outdoor areas, and both the indoor and outdoor door handles can cause the driving shaft 4 to rotate. In order to ensure the further safety of the door lock, a square tongue seat plate 21 is also installed in the lock shell 11 for horizontal sliding cooperation, and a square tongue 2 for extending out of the end face seat plate 1 is installed at the outer end of the square tongue seat plate 21, and a square tongue driving groove 24 is also provided at the inner end of the square tongue seat plate 21, and a square tongue limit pin 23 is also fixedly installed on the square tongue seat plate 21, and a secondary locking groove 54 for cooperating with the square tongue limit pin 23 is also provided on the locking seat plate 5.

[0038] In order to lock the state of the square tongue 2, a square tongue locking piece 6 is also longitudinally slidably installed in the lock housing 11. A pair of longitudinal strip grooves 65 are formed in the square tongue locking piece 6. A short pin shaft 61 and a long pin shaft 62 are fixedly installed in the lock housing 11. The short pin shaft 61 and the long pin shaft 62 are respectively slidably matched with the corresponding longitudinal strip grooves 65. A transverse strip groove 22 is also formed in the square tongue seat piece 21. The transverse strip groove 22 is slidably matched with the long pin shaft 62. A locking hook portion 66 extends from the square tongue locking piece 6. An extending notch 25 and a retracting notch 26 for cooperating with the locking hook portion 66 are formed in the square tongue seat piece 21.

[0039] In order to enable the square tongue locking piece 6 to reset flexibly, an inserting piece 63 also extends from the end of the square tongue locking piece 6. The inserting piece 63 is slidably inserted into a third limiting vertical piece 14 in the lock housing 11. A locking spring 64 is also sleeved on the inserting piece 63. One end of the locking spring 64 abuts against the square tongue locking piece 6, and the other end abuts against the third limiting vertical piece 14.

[0040] The working principle of the cooperation between the square tongue seat piece 21 and the square tongue locking piece 6 is as follows: The key lock core can first drive the square tongue locking piece 6 to move against the elastic force of the locking spring 64, so that the locking hook portion 66 is disengaged from the retracting notch 26. Then, the key lock core can push the square tongue driving notch 24 of the square tongue seat piece 21, so that the square tongue 2 extends out of the end face seat piece 1. After the square tongue 2 extends out, the square tongue limiting pin 23 on the square tongue seat piece 21 can be inserted into the secondary locking notch 54 of the lock stop seat piece 5, so as to perform secondary locking on the inclined tongue 3. When the square tongue 2 extends out, the inclined tongue 3 can only remain in the extended state. In addition, after the square tongue 2 extends out, the square tongue locking piece 6 can reset under the elastic force of the locking spring 64, and at this time, the locking hook portion 66 can be inserted into the extending notch 25 to lock the square tongue seat piece 21.

[0041] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention. Any reference signs in the claims should not be regarded as limiting the claimed rights.

Claims

1. A linkage locking door lock, comprising an end seat (1), a lock housing (11), a drive shaft (4), a latch bolt (3), and a latch bolt spring (33) for pushing the latch bolt (3) out of the end seat (1), a latch bolt slide (31) extending from the inner side of the latch bolt (3), a latch bolt pin (34) being arranged on the latch bolt slide (31), and an upper limit sleeve of the drive shaft (4) being provided with a toggle arm (44) for pushing the latch bolt pin (34) to retract, characterized in that: A locking seat piece (5) is also slidably installed in the lock housing (11). The end of the locking seat piece (5) has an end limiting portion (51) for limiting and locking the inner end of the oblique tongue (3) and an oblique tongue avoidance notch (52). A locking drive piece (42) is limitedly sleeved on the drive rotating shaft (4). The locking drive piece (42) has a locking drive pin shaft (421). A locking drive notch (53) for cooperating with the locking drive pin shaft (421) is also provided on the locking seat piece (5). The locking seat piece (5) has a locking position and an unlocking position in its own sliding direction. When the locking seat piece (5) moves to the locking position, the end limiting portion (51) moves to the inner end of the oblique tongue (3) to limit the retraction of the oblique tongue (3). When the locking seat piece (5) moves to the unlocking position, the oblique tongue avoidance notch (52) moves to the inner end of the oblique tongue (3) to allow the oblique tongue (3) to retract.

2. The interlocking locking door lock according to claim 1, characterized in that, A spring damping assembly (7) is also fixedly installed in the lock housing (11). A locking position damping hole (55) is provided on the locking seat piece (5) corresponding to the locking position, and an unlocking position damping hole (56) is provided on the locking seat piece (5) corresponding to the unlocking position. The spring damping assembly (7) includes a spring damping sleeve (71). A damping spring (72) is arranged in the spring damping sleeve (71). The outer end of the damping spring (72) pushes a damping ball (73) to make it abut against the locking seat piece (5), the locking position damping hole (55) or the unlocking position damping hole (56).

3. The interlocking locking door lock according to claim 1, characterized in that, End guiding covers (12) are fixedly installed at both the upper and lower ends of the end face seat piece (1). End sliding pieces (13) are respectively clamped at both ends of the locking seat piece (5), and the end sliding pieces (13) are respectively slidably fitted in the end guiding covers (12).

4. The interlocking locking door lock according to claim 3, characterized in that, The lock housing (11) is assembled by splicing a pair of half shells. A pair of guiding cover clamping portions (121) extend from the end guiding cover (12), and a guiding cover clamping groove (122) for cooperating with the guiding cover clamping portion (121) is provided at the end of the half shell.

5. The interlocking locking door lock according to claim 1, characterized in that, An oblique tongue guiding seat (32) is fixedly installed in the lock housing (11). The oblique tongue sliding rod (31) is movably and fittingly inserted in the oblique tongue guiding seat (32). The oblique tongue spring (33) is arranged in the oblique tongue guiding seat (32), and the end of the oblique tongue spring (33) abuts against the end face of the oblique tongue sliding rod (31).

6. The interlocking locking door lock according to claim 5, wherein, A reset tooth piece (43) is also limitedly sleeved on the drive rotating shaft (4). A reset rack (431) for cooperating with the reset tooth piece (43) is also provided near the edge of the lock housing (11) inside. A reset torsion spring (432) for cooperating with the end of the reset rack (431) is also installed in the lock housing (11). Inside the lock housing (11), a limiting piece (41) is further provided. The limiting piece (41) has an arc-shaped notch for cooperating with the driving rotating shaft (4). One end of the limiting piece (41) is clamped with a first limiting vertical piece (15) inside the lock housing (11), and the other end is clamped with the oblique tongue guide seat (32). A sliding channel is formed between the side of the limiting piece (41) away from the driving rotating shaft (4) and the edge of the lock housing (11). The reset rack (431) is slidably fitted in the sliding channel. A second limiting vertical piece (16) is also installed inside the lock housing (11).

7. The interlocking locking door lock according to claim 5, characterized in that, A square tongue seat piece (21) is also slidably fitted horizontally inside the lock housing (11). A square tongue (2) for protruding from the end face seat piece (1) is installed at the outer end of the square tongue seat piece (21). A square tongue driving notch (24) is further provided at the inner end of the square tongue seat piece (21). A square tongue limiting pin (23) is fixedly installed on the square tongue seat piece (21). A secondary locking notch (54) for cooperating with the square tongue limiting pin (23) is also provided on the locking seat piece (5).

8. The interlocking locking door lock according to claim 7, wherein A square tongue locking piece (6) is also slidably fitted longitudinally inside the lock housing (11). A pair of longitudinal slots (65) are formed on the square tongue locking piece (6). A short pin shaft (61) and a long pin shaft (62) are fixedly installed inside the lock housing (11). The short pin shaft (61) and the long pin shaft (62) are respectively slidably fitted with the corresponding longitudinal slots (65). A transverse slot (22) is also formed on the square tongue seat piece (21). The transverse slot (22) is slidably fitted with the long pin shaft (62). A locking hook portion (66) extends from the square tongue locking piece (6). An extending notch (25) and a retracting notch (26) for cooperating with the locking hook portion (66) are formed on the square tongue seat piece (21).

9. The interlocking locking door lock according to claim 8, characterized in that, An inserting piece (63) also extends from the end of the square tongue locking piece (6). The inserting piece (63) is slidably inserted into a third limiting vertical piece (14) inside the lock housing (11). A locking spring (64) is also sleeved on the inserting piece (63). One end of the locking spring (64) abuts against the square tongue locking piece (6), and the other end abuts against the third limiting vertical piece (14).

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