Symmetrical door lock structure

Abstract

A symmetrical door lock structure comprises an inner handle unit, an outer handle unit and a transmission shaft arranged between the inner handle unit and the outer handle unit, and the inner handle unit and the outer handle unit are of the same symmetrical structure. The inner handle unit and the outer handle unit are symmetrical and identical in structure, structural consistency of the inner handle unit and the outer handle unit is achieved, parts of the inner handle unit and the outer handle unit are universalized, production cost can be reduced, production efficiency and product quality can be improved, user experience is improved, and product quality is improved. And the method has remarkable economic benefits and social benefits.

Description

Technical Field

[0001] The utility model relates to the technical field of door locks, in particular to a symmetrical door lock structure. Background Art

[0002] In the current door lock design and manufacturing industry, the door lock handle is the main component for users to interact with the door lock, and its structural design and manufacturing cost have always been the focus of attention of enterprises. However, there is a significant problem in the existing door lock design, that is, the structural inconsistency between the outer door lock handle and the inner door lock handle.

[0003] Specifically, the external door lock handle is usually located on the outside of the door, and needs to take into account various external factors such as waterproof, dustproof, and impact resistance. Therefore, its structural design is relatively complex and the material requirements are relatively strict. The internal door lock handle is mainly located on the inside of the door and has less contact with the external environment. Therefore, its structural design is relatively simple and the material requirements are relatively low.

[0004] Due to this structural inconsistency, two different sets of molds and production lines need to be prepared during the production process to manufacture the outer door lock handle and the inner door lock handle respectively. This not only increases production costs but also reduces production efficiency. In addition, since the two handles have different parts, additional inventory management is required, further increasing management costs and risks.

[0005] In terms of cost control, the need to produce two sets of different parts leads to low material utilization and difficulty in reducing production costs. At the same time, due to the complexity of the production line, the maintenance and update costs of equipment also increase. These factors have affected the competitiveness of enterprises in the field of door lock manufacturing to a certain extent. Utility Model Content

[0006] In order to overcome the deficiencies of the prior art, the utility model provides a symmetrical door lock structure.

[0007] The technical solution adopted by the utility model to solve its technical problems is:

[0008] A symmetrical door lock structure comprises an inner handle unit, an outer handle unit and a transmission shaft arranged between the inner handle unit and the outer handle unit, characterized in that:

[0009] The inner handle unit and the outer handle unit are symmetrical and identical in structure;

[0010] The inner handle unit and the outer handle unit each comprise a door handle, a mounting seat, a cover shell and a connecting shaft, and the mounting seat is provided with a first through hole for the transmission shaft to pass through;

[0011] The cover shell comprises a mounting cavity located at the back side thereof and a second through hole located at the front side thereof and connected to the mounting cavity;

[0012] The mounting seat is installed in the mounting cavity, the door handle is located on the front side of the cover shell, the connecting shaft is rotatably engaged in the second through hole and one end is connected to the door handle, and the other ends of the connecting shafts of the inner handle unit and the outer handle unit are respectively connected to the two ends of the transmission shaft.

[0013] In the utility model, a buckle groove is provided on the top wall of the installation cavity, a buckle portion for buckling in the buckle groove is provided on the top of the installation seat, and a locking screw hole vertically penetrating and connecting the installation cavity is provided at the bottom of the cover shell, and the thread in the locking screw hole is matched with the first top screw for locking the bottom of the installation seat.

[0014] In the utility model, a first connecting hole is provided on one end of the door handle, a handle connecting portion inserted into the first connecting hole is provided on the connecting shaft, and a first bolt is used to lock the handle connecting portion and the door handle.

[0015] In the utility model, a connecting transmission hole is provided at the other end of the connecting shaft, and the end of the transmission shaft matches with the connecting transmission hole.

[0016] In the utility model, a split cut is provided at the end of the transmission shaft, which divides the end of the transmission shaft into two transmission shaft mounting parts. A handle screw hole is provided on the door handle, and a connecting shaft through hole is provided on the handle connecting part. A second top screw is screwed into the handle screw hole, and the second top screw passes through the connecting shaft through hole and extends into the split cut, so that the two transmission shaft mounting parts are stretched outward and tightly abut against the wall surface of the connecting transmission hole.

[0017] In the utility model, a cover shaft portion is protruded on the wall surface of the installation cavity and is coaxially arranged with the second through hole. The second through hole is arranged through the cover shaft portion. A reset turntable that rotates synchronously with the connecting shaft is mounted on the connecting shaft. A reset torsion spring is mounted on the cover shaft portion. The reset torsion spring is used to cooperate with the reset turntable to enable the door handle to reset after the door handle is rotated to open the door lock.

[0018] In the utility model, a torsion spring limiting portion is also protruded on the wall surface of the installation cavity, a turntable transmission portion is provided on the reset turntable, and the two torsion arms of the reset torsion spring are staggered to form a turntable matching position, and the torsion spring limiting portion and the turntable transmission portion both extend into the turntable matching position.

[0019] In the utility model, a first rotation limiting portion and a second rotation limiting portion are protruded on the wall surface of the installation cavity; and the turntable transmission portion moves between the first rotation limiting portion and the second rotation limiting portion.

[0020] In the utility model, a locking guide groove is provided in the installation cavity, and a locking slide seat which can slide along the guide is provided in the locking guide groove, and the locking slide seat on the inner handle unit and the locking slide seat on the outer handle unit move synchronously with each other using a synchronous movement structure;

[0021] An operating through hole is provided on the cover shell of the inner handle unit, and an operating portion extending from the operating through hole to the front side of the cover shell is provided on the locking slide seat on the inner handle unit;

[0022] The locking slide is provided with a locking matching groove for matching and locking the reset rotary disk, and the reset rotary disk is provided with a locking matching portion for matching and inserting into the locking matching groove to achieve locking.

[0023] In the utility model, a locking retaining groove and an unlocking retaining groove are provided in the locking guide groove, and a marble assembly is installed on the locking slide seat for being inserted into the locking retaining groove when the door handle is locked and for being inserted into the unlocking retaining groove when the door handle is unlocked.

[0024] Beneficial effects of the utility model: the inner handle unit and the outer handle unit of the utility model are symmetrical and identical in structure, so as to achieve structural consistency between the inner handle unit and the outer handle unit, and make the parts of the inner handle unit and the outer handle unit universal. The advantages of this design are:

[0025] 1. Reduce the types and quantity of parts: By unifying the parts structure and manufacturing process, the types and quantity of required parts are greatly reduced, thereby reducing production costs;

[0026] 2. Improve production efficiency: The use of unified molds and production lines simplifies the production process and improves production efficiency;

[0027] 3. Reduce management costs: The reduction in the number of parts makes inventory management simpler and reduces management costs;

[0028] 4. Improve product quality: By reducing the types and quantities of parts, the error rate in the production and assembly process is reduced, thereby improving product quality;

[0029] 5. Improve user experience: The uniformity of appearance and structure makes the door lock handle more beautiful and coordinated, improving the user experience.

[0030] To sum up, the door lock handle design proposed in this patent can effectively solve the structural inconsistency problem existing in the existing door lock design, reduce production costs, improve production efficiency and product quality, and at the same time enhance user experience, with significant economic and social benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The utility model is further described below in conjunction with the accompanying drawings and embodiments:

[0032] Figure 1 The three-dimensional Figure 1 ;

[0033] Figure 2 The three-dimensional Figure 2 ;

[0034] Figure 3 This is an exploded view of the door lock;

[0035] Figure 4 This is an exploded view of the inner handle unit;

[0036] Figure 5 This is an exploded view of the external handle unit;

[0037] Figure 6 Cross-section of a door lock Figure 1 ;

[0038] Figure 7 Cross-section of a door lock Figure 2 ;

[0039] Figure 8 Cross-section of a door lock Figure 3 ;

[0040] Fig. 9 This is a schematic diagram of the external handle unit after removing the mounting base. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solution and advantages of the embodiments of the present utility model clearer, the technical solution in the embodiments of the present utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the present utility model.

[0042] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, top, bottom, inside, outside, vertical, horizontal, longitudinal, counterclockwise, clockwise, circumferential, radial, axial...), then the directional indication is only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0043] In addition, if there are descriptions involving "first" or "second" etc. in the embodiments of the utility model, the descriptions of "first" or "second" etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0044] Reference Figure 1-9 A symmetrical door lock structure includes an inner handle unit 100, an outer handle unit 200 and a transmission shaft 1 located at the inner handle unit 100 and the outer handle unit 200, wherein the inner handle unit 100 and the outer handle unit 200 are symmetrical and identical structures; the middle portion of the transmission shaft 1 is matched with the lock tongue of the lock core assembly for transmission, and the two ends of the transmission shaft 1 are respectively connected to the inner handle unit 100 and the outer handle unit 200.

[0045] Furthermore, the inner handle unit 100 and the outer handle unit 200 both include a door handle 2, a mounting base 3, a cover shell 4 and a connecting shaft 5. The mounting base 3 is provided with a first through hole 30 for the transmission shaft 1 to pass through and at least one mounting connection hole for cooperating with a fastening bolt to mount the mounting base 3 on a door body or a lock box. There are four mounting connection holes distributed in four corners, and a fastening bolt can be inserted into each mounting connection hole, so that the mounting base 3 can be fixed to the door body or the lock box by using the fastening bolts.

[0046] Furthermore, the cover shell 4 is square, and the cover shell 4 includes an installation cavity 40 located on the back side thereof and a second through hole 41 located on the front side thereof and connected to the installation cavity 40; the mounting seat 3 is installed in the installation cavity 40, so that the mounting seat 3 is not exposed, which effectively improves the appearance of the door lock, and at the same time can effectively reduce the probability of external dirt entering the interior of the mounting seat 3 and corroding and damaging the internal structural components of the inner installation cavity 40, thereby achieving the purpose of extending the service life of the door lock, and facilitating the use of the same parts to form the inner handle unit 100 and the outer handle unit 200; the door handle 2 is located on the front side of the cover shell 4, and the connecting shaft 5 can be rotatably engaged in the second through hole 41 and one end is connected to the door handle 2, and the other ends of the connecting shafts 5 of the inner handle unit 100 and the outer handle unit 200 are respectively connected to the two ends of the transmission shaft 1.

[0047] The inner handle unit 100 and the outer handle unit 200 of the present embodiment have symmetrical and identical structures, thereby achieving structural consistency of the inner handle unit 100 and the outer handle unit 200. The inner handle unit 100 and the outer handle unit 200 also achieve common parts, so that the same production mold and production line can be used to complete the production of the inner handle unit 100 and the outer handle unit 200, thereby simplifying the production process and reducing costs.

[0048] As a preferred embodiment, a buckle groove 401 is provided on the top wall of the installation cavity 40, a buckle portion 31 for buckling in the buckle groove 401 is provided on the top of the installation seat 3, and a locking screw hole vertically penetrating and communicating with the installation cavity 40 is provided at the bottom of the cover shell 4, and the first top screw 6 for locking the bottom of the installation seat 3 is threadedly matched in the locking screw hole; when the installation seat 3 is installed in the installation cavity 40, the buckle portion 31 is buckled in the buckle groove 401, and then locked by the first top screw 6, so that the installation seat 3 can be quickly buckled in the installation cavity 40. In addition, the locking screw hole is located at the bottom of the cover shell 4, so that the locking screw hole and the first top screw 6 can be hidden and not easily seen by the user, which not only improves the beauty of the door lock, but also makes it difficult for external water, dust and other dirt to fall on the locking screw hole and the first top screw 6, thereby extending the service life of the first top screw 6.

[0049] In this embodiment, there are at least two buckle parts 31 arranged from left to right, and there are at least two buckle grooves 401 arranged from left to right. At least one buckle part 31 is buckled in each buckle groove 401. By cooperating with multiple buckle parts 31 and multiple buckle grooves 401, the stability of the upper part of the mounting seat 3 being buckled in the mounting cavity 40 is improved.

[0050] As a preferred embodiment, in order to enhance the locking effect of the first top screw 6 on the mounting seat 3, a mounting positioning hole 32 is provided at the bottom of the mounting seat 3, and the mounting positioning hole 32 is just suitable for the partial insertion of the first top screw 6. When the first top screw 6 is tightened, the top end of the first top screw 6 will accurately enter the mounting positioning hole 32, and the upper end of the first top screw 6 will be in close contact with the bottom surface of the mounting seat 3. This design cleverly connects the bottom of the mounting seat 3 and the bottom of the cover 4 firmly, thereby significantly improving the overall installation quality and stability.

[0051] In this embodiment, a first connection hole is provided at one end of the door handle 2 for firmly connecting with the connecting shaft 5. The connecting shaft 5 is provided with a handle connecting portion 51 inserted into the first connection hole, and its shape matches the first connection hole to ensure that the two can rotate coaxially. In addition, a first bolt is used to lock the handle connecting portion 51 and the door handle 2, thereby ensuring a reliable connection between the door handle 2 and the connecting shaft 5. In order to further improve the smoothness of rotation and the stability of connection, the cross-sectional shapes of the first connection hole and the handle connecting portion 51 are both designed to be polygonal, such as a square. Such a design not only ensures the smoothness of rotation, but also increases the firmness of the connection.

[0052] In addition, a connection limiting convex ring 53 is provided on the outer circumference of the connection shaft 5. The connection limiting convex ring 53 plays a key role in function, which prevents the connection shaft 5 from excessive displacement and avoids the connection shaft 5 from completely passing through the second through hole 41. In order to optimize this design, a limiting accommodating groove is provided at one end of the first connection hole close to the housing 4. When the connection shaft 5 is installed in place, the end of the connection limiting convex ring 53 facing away from the housing 4 will at least partially extend into the limiting accommodating groove. This design not only increases the axial thickness of the connection limiting convex ring 53 and improves its structural stability, but also cleverly hides the connection limiting convex ring 53 through the limiting accommodating groove, avoiding the influence of its excessive protrusion on the appearance of the door lock, and maintaining the overall aesthetics of the door lock.

[0053] In this embodiment, a connecting transmission hole 52 is provided at the other end of the connecting shaft 5, and the end of the transmission shaft 1 cooperates with the connecting transmission hole 52, thereby realizing an effective transmission connection between the transmission shaft 1 and the door handle 2. Furthermore, the connecting transmission hole 52 on the connecting shaft 5 and the end cross-sectional shape of the transmission shaft 1 are both polygonal, such as square, and such a design ensures that the coaxial rotation between the two is smoother. In order to enhance the connection stability, a splitting cutout 101 is provided at the end of the transmission shaft 1, and the splitting cutout 101 divides the end of the transmission shaft 1 into two transmission shaft mounting parts 102. Both of the two transmission shaft mounting parts 102 can be tightly matched with the wall surface of the connecting transmission hole 52 of the connecting shaft 5. A handle screw hole is provided on the door handle 2, and a connecting shaft through hole is provided on the handle connecting part 51. The two ends of this connecting shaft through hole correspond to the handle screw hole and the splitting cutout 101 respectively. During installation, a second top screw 7 is screwed into the handle screw hole, and the second top screw 7 passes through the connecting shaft through hole and extends into the dividing cutout 101, so that the two transmission shaft mounting parts 102 are stretched outward, so as to closely abut against the wall surface of the connecting transmission hole 52. Such a design not only simplifies the installation process, but also enhances the connection firmness between the transmission shaft 1 and the connecting shaft 5.

[0054] As a preferred embodiment, a cover shaft portion 402 is protruded on the wall surface of the installation cavity 40 and is coaxially arranged with the second through hole 41, and the second through hole 41 is arranged to penetrate the cover shaft portion 402, thereby extending the length of the second through hole 41; wherein, the connecting shaft 5 is provided with a reset turntable 8 which rotates synchronously therewith, and the cover shaft portion 402 is provided with a reset torsion spring 9, and the reset torsion spring 9 is used to cooperate with the reset turntable 8 to enable the door handle 2 to reset after the door lock is rotated to open.

[0055] In this embodiment, a torsion spring limiting portion 403 is also protruded on the wall surface of the installation cavity 40, and a turntable transmission portion 81 is provided on the reset turntable 8. The two torsion arms of the reset torsion spring 9 are staggered to form a turntable matching position, and the torsion spring limiting portion 403 and the turntable transmission portion 81 both extend into the turntable matching position. When the user rotates the door handle 2 by hand to open the door lock, one torsion arm of the reset torsion spring 9 abuts against the torsion spring limiting portion 403, and the door handle 2 drives the turntable transmission portion 81 on the reset turntable 8 to rotate and push the other torsion arm of the reset torsion spring 9 during the rotation process, so that the reset torsion spring 9 stores energy; after the user releases the door handle 2, the reset torsion spring 9 can release energy to link the door handle 2 to reset.

[0056] In this embodiment, a first rotation limit portion 405 and a second rotation limit portion 406 are protruded from the wall surface of the installation cavity 40; the turntable transmission portion 81 moves between the first rotation limit portion 405 and the second rotation limit portion 406; when the user rotates the door handle 2 to open the door lock, when the turntable transmission portion 81 abuts against the first rotation limit portion 405 or the second rotation limit portion 406, the door handle 2 cannot continue to rotate, indicating that the door lock has been opened.

[0057] In this embodiment, the connecting shaft 5 is inserted into the center hole of the reset turntable 8, and a reset clamp is provided in the center hole; correspondingly, a connection linkage groove 54 is provided on the outer surface of the connecting shaft 5, and the reset clamp can be inserted into the connection linkage groove 54, so that the connecting shaft 5 and the reset turntable 8 can rotate synchronously, realizing a linkage mechanism between the two. In order to ensure that the reset turntable 8 will not be separated from the connecting shaft 5 in the axial direction, a turntable clamp spring is also clamped on the connecting shaft 5, and its position is located between the reset turntable 8 and the housing shaft portion 402, ensuring the stability and reliability of the reset turntable 8.

[0058] As a preferred embodiment, a locking guide groove 407 is provided in the mounting cavity 40, and a locking slide that can slide along the guide is provided in the locking guide groove 407, and a locking slide located on the inner handle unit 100 and a locking slide located on the outer handle unit 200 move synchronously with each other using a synchronous movement structure; a through hole is provided on the cover shell 4, and the through hole located on the cover shell 4 of the inner handle unit 100 is an operating through hole 408, and a locking slide located on the inner handle unit 100 is provided with a locking slide extending from the operating through hole 408. An operating part 121 on the front side of the cover shell 4; the locking slide is provided with a locking matching groove 300 for cooperating to lock the reset dial 8, and the reset dial 8 is provided with a locking matching part 82 for cooperating to insert into the locking matching groove 300 to achieve locking; a locking retaining groove 4071 and an unlocking retaining groove 4072 are provided in the locking guide groove 407, and a marble assembly for being inserted into the locking retaining groove 4071 when the door handle 2 is locked and for being inserted into the unlocking retaining groove 4072 when the door handle 2 is unlocked is installed on the locking slide.

[0059] In this embodiment, at least one locking mounting hole is provided on the locking slide, and each locking mounting hole is installed with a marble assembly, which includes a locking marble 10 and a locking spring 11 for driving the locking marble 10 to cooperate with the locking retaining groove 4071 or the unlocking retaining groove 4072.

[0060] In this embodiment, the locking slide located in the locking guide groove 407 of the inner handle unit 100 is a first locking slide 12, and the locking slide located in the locking guide groove 407 of the outer handle unit 200 is a second locking slide 13. The first locking slide 12 is provided with a first linkage 14, and the second locking slide 13 is provided with a second linkage 15. The first linkage 14 and the second linkage 15 are connected by a threaded connection, and the first linkage 14 and the second linkage 15 constitute a synchronous moving structure.

[0061] The user drives the first locking slide 12 and the second locking slide 13 to move synchronously through the operating part 121, so that the locking matching groove 300 is close to or away from the locking matching part 82. When the locking ball 10 is inserted into the locking retaining groove 4071, the locking matching part 82 is inserted into the locking matching groove 300 to limit the rotation of the door handle 2; when the locking ball 10 is inserted into the unlocking retaining groove 4072, the locking matching groove 300 is separated from the reset turntable 8 to release the door handle 2 so that the door handle 2 can rotate.

[0062] In this embodiment, two oppositely arranged guide protrusions are raised on the wall surface of the installation cavity 40, and the backs of the two guide protrusions are commonly connected to the limiting plate 16. The wall surface of the installation cavity 40, the two guide protrusions and the limiting plate 16 together form the locking guide groove 407.

[0063] In this embodiment, the through hole on the cover 4 of the outer handle unit 200 is a status display through hole 409, and the second locking slide 13 is provided with an unlocking identification member 17 and a locking identification member 18 arranged in an up-and-down manner, wherein the unlocking identification member 17 is used to indicate that the door handle 2 is in an unlocked state and can rotate; the locking identification member 18 is used to indicate that the door handle 2 is locked and cannot rotate. When the second locking slide 13 moves to make the door handle 2 in a locked position, the locking identification member 18 will be exactly opposite to the status display through hole 409, so that outsiders can clearly see this state and understand that the door handle 2 has been locked. At the same time, the unlocking identification member 17 will deviate from the status display through hole 409 and will not be seen.

[0064] On the contrary, when the second locking slide 13 moves to the unlocked position of the door handle 2, the unlocking identification member 17 will be aligned with the status display through hole 409, thereby conveying the information that the door handle 2 is in a rotatable unlocked state to outsiders. At this time, the locking identification member 18 will be offset from the status display through hole 409 and will not be displayed.

[0065] The above description is only a preferred embodiment of the present invention. Any technical solution that achieves the purpose of the present invention by substantially the same means shall fall within the protection scope of the present invention.

Claims

1. A symmetrical door lock structure, comprising an inner handle unit (100), an outer handle unit (200), and a transmission shaft (1) arranged between the inner handle unit (100) and the outer handle unit (200), characterized in that: The inner handle unit (100) and the outer handle unit (200) are symmetrical and identical structures; The inner handle unit (100) and the outer handle unit (200) both comprise a door handle (2), a mounting seat (3), a cover shell (4) and a connecting shaft (5); the mounting seat (3) is provided with a first through hole (30) for the transmission shaft (1) to pass through; The cover shell (4) comprises a mounting cavity (40) located on the back side thereof and a second through hole (41) located on the front side thereof and connected to the mounting cavity (40); The mounting seat (3) is mounted in the mounting cavity (40), the door handle (2) is located on the front side of the cover shell (4), the connecting shaft (5) is rotatably engaged in the second through hole (41) and one end is connected to the door handle (2), and the other ends of the connecting shafts (5) of the inner handle unit (100) and the outer handle unit (200) are respectively connected to two ends of the transmission shaft (1).

2. A symmetrical door lock structure according to claim 1, characterized in that: A buckle groove (401) is provided on the top wall of the installation cavity (40), a buckle portion (31) for buckling in the buckle groove (401) is provided on the top of the installation seat (3), and a locking screw hole vertically penetrating and communicating with the installation cavity (40) is provided at the bottom of the cover shell (4), and a first top screw (6) for locking the bottom of the installation seat (3) is threadedly matched in the locking screw hole.

3. A symmetrical door lock structure according to claim 1, characterized in that: A first connection hole is provided at one end of the door handle (2), a handle connection portion (51) inserted into the first connection hole is provided on the connection shaft (5), and a first bolt is used to lock the handle connection portion (51) and the door handle (2).

4. A symmetrical door lock structure according to claim 3, characterized in that: The other end of the connecting shaft (5) is provided with a connecting transmission hole (52), and the end of the transmission shaft (1) matches the connecting transmission hole (52).

5. A symmetrical door lock structure according to claim 4, characterized in that: The end of the transmission shaft (1) is provided with a splitting notch (101), the splitting notch (101) divides the end of the transmission shaft (1) into two transmission shaft mounting parts (102), the door handle (2) is provided with a handle screw hole, the handle connecting part (51) is provided with a connecting shaft through hole, a second top screw (7) is screwed into the handle screw hole, the second top screw (7) passes through the connecting shaft through hole and extends into the splitting notch (101), so that the two transmission shaft mounting parts (102) are stretched outward and tightly abut against the wall surface of the connecting transmission hole (52).

6. A symmetrical door lock structure according to any one of claims 1 to 5, characterized in that: A housing shaft portion (402) is protruded from the wall surface of the installation cavity (40) and is coaxially arranged with the second through hole (41); the second through hole (41) is arranged through the housing shaft portion (402); a reset rotary disk (8) which rotates synchronously with the connecting shaft (5) is sleeved on the connecting shaft (5); a reset torsion spring (9) is sleeved on the housing shaft portion (402); the reset torsion spring (9) is used to cooperate with the reset rotary disk (8) so that the door handle (2) is driven to reset after the door lock is rotated to open.

7. A symmetrical door lock structure according to claim 6, characterized in that: A torsion spring limiting portion (403) is also provided protrudingly on the wall surface of the installation cavity (40), a turntable transmission portion (81) is provided on the reset turntable (8), two torsion arms of the reset torsion spring (9) are staggered to form a turntable matching position, and the torsion spring limiting portion (403) and the turntable transmission portion (81) both extend into the turntable matching position.

8. A symmetrical door lock structure according to claim 7, characterized in that: A first rotation limiting portion (405) and a second rotation limiting portion (406) are also protruded on the wall surface of the installation cavity (40); the turntable transmission portion (81) moves between the first rotation limiting portion (405) and the second rotation limiting portion (406).

9. A symmetrical door lock structure according to claim 6, characterized in that: A locking guide groove (407) is provided in the installation cavity (40), and a locking slide seat that can slide along the guide is provided in the locking guide groove (407), and the locking slide seat on the inner handle unit (100) and the locking slide seat on the outer handle unit (200) move synchronously using a synchronous movement structure; An operating through hole (408) is provided on the cover (4) of the inner handle unit (100), and an operating portion (121) extending from the operating through hole (408) to the front side of the cover (4) is provided on the locking slide seat on the inner handle unit (100); The locking slide is provided with a locking matching groove (300) for matching and locking the reset rotary disk (8), and the reset rotary disk (8) is provided with a locking matching portion (82) for matching and inserting into the locking matching groove (300) to achieve locking.

10. A symmetrical door lock structure according to claim 9, characterized in that: A locking retaining groove (4071) and an unlocking retaining groove (4072) are provided in the locking guide groove (407), and a marble assembly is mounted on the locking slide for snapping into the locking retaining groove (4071) when the door handle (2) is locked and for snapping into the unlocking retaining groove (4072) when the door handle (2) is unlocked.

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