A door lock cover assembly

Abstract

The utility model discloses a door lock rear cover assembly, including mounting seat, manual drive part and outer cover shell. The mounting seat is provided with door body installation structure, manual drive part rotation is arranged in the mounting seat, and the manual drive part is used for driving lock core action, and the outer cover shell is provided with the accommodation groove, and the mounting seat is detachably connected in the accommodation groove of outer cover shell, and the outer cover shell shields the door body installation structure, and the bottom wall of accommodation groove is provided with the let -by through -hole, and the manual drive part is worn in the let -by through -hole, wherein the mounting seat is provided with the elastic resistance top, and the elastic resistance top is in abutment with the groove wall of accommodation groove, and / or the outer cover shell is provided with the elastic resistance top in the groove wall of accommodation groove, and the elastic resistance top is in abutment with the mounting seat.

Description

Technical Field

[0001] This utility model relates to door locks, and more particularly to a door lock back cover assembly. Background Technology

[0002] Doors are usually equipped with locks, which include a lock cylinder, a front lock cover assembly, and a rear lock cover assembly. The lock cylinder is installed inside the door, the front lock cover assembly is installed on the front side of the door, and the rear lock cover assembly is installed on the rear side of the door. Both the front and rear lock cover assemblies can drive the lock cylinder to open and close.

[0003] Some existing door lock back cover assemblies include a mounting base, a manual drive mechanism, and an outer cover. The mounting base can be installed on the door via a door mounting structure. The manual drive mechanism rotates to set the mounting base in place, and its rotation drives the lock cylinder to open and close. The outer cover has a receiving groove, within which the mounting base is detachably connected. The outer cover can conceal the door mounting structure of the mounting base. When the door lock needs maintenance, the user can remove the outer cover to disassemble the mounting base. To facilitate the disassembly of the mounting base and the outer cover, and due to factors such as manufacturing precision, there is usually a certain assembly gap between the mounting base and the receiving groove wall of the outer cover. When the door lock back cover assembly is installed on the door, in environments with high winds, the outer cover may vibrate relative to the mounting base, generating significant noise and affecting the user experience. Utility Model Content

[0004] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a door lock back cover assembly that can suppress the vibration of the outer cover shell relative to the mounting base and reduce noise.

[0005] According to an embodiment of the present invention, a door lock back cover assembly includes a mounting base, a manual drive component, and an outer cover shell. The mounting base is provided with a door mounting structure; the manual drive component is rotatably mounted on the mounting base and is used to drive the lock cylinder; the outer cover shell is provided with a receiving groove, and the mounting base is detachably connected to the receiving groove of the outer cover shell, the outer cover shell covering the door mounting structure; the bottom wall of the receiving groove is provided with a clearance through hole, and the manual drive component passes through the clearance through hole; wherein the mounting base is provided with an elastic abutment top, the elastic abutment top abutting against the groove wall of the receiving groove; and / or the outer cover shell is provided with an elastic abutment top on the groove wall of the receiving groove, the elastic abutment top abutting against the mounting base.

[0006] The door lock back cover assembly according to the present utility model has at least the following beneficial effects: after the mounting base and the outer cover are assembled, the groove walls of the receiving groove of the mounting base and the outer cover are engaged by an elastic abutment. The elastic abutment can undergo a certain degree of elastic deformation, which makes the mounting base and the outer cover have a tight assembly contact without affecting the disassembly and assembly process of the mounting base and the outer cover, suppressing the vibration of the outer cover relative to the mounting base, thereby reducing noise and improving the user experience.

[0007] According to some embodiments of the present invention, the mounting base is integrally formed with the elastic abutment top, the elastic abutment top including a first elastic arm and a protrusion, the protrusion being connected to the side of the first elastic arm near the bottom wall of the receiving groove, and the protrusion abutting against the bottom wall of the receiving groove.

[0008] According to some embodiments of the present invention, the mounting base is provided with at least two elastic abutments arranged around the rotation axis of the manual drive member.

[0009] According to some embodiments of the present invention, a gear shift mechanism is also included. The gear shift mechanism includes a gear shift part and at least two gear shift mating parts. The gear shift part is disposed on the manual drive member, and the gear shift mating parts are disposed on the mounting base. The gear shift mating parts are arranged around the rotation axis of the manual drive member. When the manual drive member rotates relative to the mounting base, the gear shift part can switch to engage with different gear shift mating parts.

[0010] According to some embodiments of the present invention, the gear position includes a top ball and an elastic element, the gear position mating part is a gear position groove, the top ball is slidably disposed on the manual drive member and can enter or disengage from the gear position groove, and the elastic element can apply a force to cause the top ball to enter the gear position groove.

[0011] According to some embodiments of this utility model, the side wall of the receiving groove is provided with a limiting block, and the mounting seat has a limiting position and a split position relative to the outer cover shell. The mounting seat can rotate relative to the outer cover shell between the split position and the limiting position. In the split position, the limiting block is offset from the mounting seat, and the mounting seat can disengage from the receiving groove along the depth direction of the receiving groove. In the limiting position, the limiting block and the mounting seat are opposite each other along the depth direction of the receiving groove, and the limiting block stops the mounting seat from disengaging from the receiving groove along the depth direction of the receiving groove.

[0012] According to some embodiments of the present invention, the outer periphery of the mounting base is provided with an elastic snap-fit ​​portion, and the side wall of the receiving groove is provided with a snap-fit ​​mating portion. In the split position, the elastic snap-fit ​​portion and the snap-fit ​​mating portion are separated; in the limiting position, the elastic snap-fit ​​portion and the snap-fit ​​mating portion are snap-fitted together and restrict the mounting base from rotating relative to the outer cover shell.

[0013] According to some embodiments of the present invention, the outer circumference of the mounting base is integrally formed with the elastic snap-fit ​​portion, the elastic snap-fit ​​portion includes a second elastic arm and a snap-fit ​​block, the snap-fit ​​block is connected to the second elastic arm, the snap-fit ​​block is located on the side of the second elastic arm near the groove wall of the receiving groove, and the snap-fit ​​mating portion is a snap-fit ​​groove.

[0014] According to some embodiments of this utility model, it also includes an unlocking component. The outer cover is provided with an unlocking through hole. At the limiting position, the unlocking through hole is opposite to the elastic locking part. The unlocking component can pass through the unlocking through hole and push the elastic locking part to elastically deform to a position where it is separated from the locking engagement part.

[0015] According to some embodiments of the present invention, the outer periphery of the mounting base is provided with at least two elastic snap-fit ​​portions, and the outer cover is provided with at least two snap-fit ​​mating portions. The elastic snap-fit ​​portions and the snap-fit ​​mating portions correspond one-to-one. At the limiting position, the unlocking through hole is opposite to the lowermost elastic snap-fit ​​portion, and the unlocking through hole is located at the lower end of the outer cover.

[0016] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0017] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0018] Figure 1 This is a perspective view of the door lock back cover assembly according to an embodiment of the present utility model;

[0019] Figure 2 This is a perspective view of the door lock back cover assembly according to an embodiment of the present utility model;

[0020] Figure 3 This is a perspective view of the mounting base according to an embodiment of the present utility model;

[0021] Figure 4 This is an exploded view of the door lock back cover assembly according to an embodiment of the present utility model;

[0022] Figure 5 This is an embodiment of the present utility model. Figure 1 A cross-sectional view along the AA direction.

[0023] Figure label:

[0024] Mounting base 100, door mounting structure 110, elastic top abutment 120, first elastic arm 121, protrusion 122, elastic locking part 130, second elastic arm 131, locking block 132;

[0025] Manual drive unit 200;

[0026] Outer cover 300, receiving groove 310, clearance through hole 320, limiting block 330, snap-fit ​​part 340, unlocking through hole 350;

[0027] Gear mechanism 400, gear part 410, top ball 411, elastic element 412, gear mating part 420;

[0028] Unlock kit 500. Detailed Implementation

[0029] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0030] In the description of this utility model, it should be understood that the orientation descriptions, such as up, down, etc., are based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0031] In the description of this utility model, "multiple" refers to two or more. The use of "first" and "second" is for distinguishing technical features only and should not be construed as indicating or implying relative importance, or implicitly indicating the number of technical features or their sequential relationship.

[0032] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0033] Reference Figures 1 to 5The door lock back cover assembly of this utility model includes a mounting base 100, a manual drive component 200, and an outer cover shell 300. The mounting base 100 is provided with a door mounting structure 110; the manual drive component 200 is rotatably disposed on the mounting base 100 and is used to drive the lock cylinder; the outer cover shell 300 is provided with a receiving groove 310, and the mounting base 100 is detachably connected to the receiving groove 310 of the outer cover shell 300. The outer cover shell 300 covers the door mounting structure 110. The bottom wall of the receiving groove 310 is provided with a clearance through hole 320, and the manual drive component 200 passes through the clearance through hole 320; wherein the mounting base 100 is provided with an elastic abutment top 120, and the elastic abutment top 120 abuts against the groove wall of the receiving groove 310.

[0034] After the mounting base 100 and the outer cover 300 are assembled, the groove walls of the receiving groove 310 of the mounting base 100 and the outer cover 300 are engaged by the elastic abutment top 120. The elastic abutment top 120 can undergo a certain degree of elastic deformation, which makes the mounting base 100 and the outer cover 300 have a tight assembly contact without affecting the disassembly and assembly process of the mounting base 100 and the outer cover 300, suppressing the vibration of the outer cover 300 relative to the mounting base 100, thereby reducing noise and improving the user experience.

[0035] Specifically, the door mounting structure 110 can be screw mounting holes, etc.

[0036] It is conceivable that in other embodiments, the outer cover 300 may also have an elastic abutment 120 on the groove wall of the receiving groove 310, which abuts against the mounting base 100 to achieve the same effect; or both may have an elastic abutment 120.

[0037] In the embodiments, reference is made to Figure 3 The mounting base 100 is integrally formed with an elastic abutment top 120, which includes a first elastic arm 121 and a protrusion 122. The protrusion 122 is connected to the side of the first elastic arm 121 near the bottom wall of the receiving groove 310, and abuts against the bottom wall of the receiving groove 310. The first elastic arm 121 and the protrusion 122 are integrally formed to form the elastic abutment top 120. The first elastic arm 121 can undergo elastic deformation to adapt to the assembly gap between the mounting base 100 and the outer cover 300, thereby suppressing the vibration of the outer cover 300. The structure is simple and easy to implement.

[0038] Specifically, the mounting base 100 is made of plastic, which gives the one-piece molded elastic top 120 good elasticity.

[0039] In the embodiments, reference is made to Figure 3The mounting base 100 has four elastic abutments 120 arranged around the rotation axis of the manual drive component 200. The arrangement of multiple elastic abutments 120 facilitates the adaptive fit of the mounting base 100 with the bottom wall of the receiving groove 310, improves the vibration suppression effect of the outer cover 300, and further reduces noise.

[0040] It is conceivable that in other embodiments, the mounting base 100 may also be provided with two, three or more elastic abutment tops 120; the elastic abutment tops 120 may also be other structures, such as rubber pads or silicone pads, etc., which can be specifically selected by those skilled in the art according to actual needs.

[0041] Specifically, in this embodiment, the elastic abutment top 120 is disposed on the mounting base 100. Optionally, in other embodiments, the elastic abutment top 120 may also be disposed at the receiving groove 310 of the outer cover 300.

[0042] In the embodiments, reference is made to Figure 3 and Figure 5 It also includes a gear shift mechanism 400, which comprises a gear shift part 410 and two gear shift mating parts 420. The gear shift part 410 is disposed on the manual drive member 200, and the gear shift mating parts 420 are disposed on the mounting base 100. The gear shift mating parts 420 are arranged around the rotation axis of the manual drive member 200. When the manual drive member 200 rotates relative to the mounting base 100, the gear shift part 410 can switch to different gear shift mating parts 420. By setting up the gear shift mechanism 400, a gear shift feel is formed when the manual drive member 200 rotates, making it convenient for the manual drive member 200 to rotate and stop at a designated position, resulting in a better user experience.

[0043] In the embodiments, reference is made to Figure 5 The gear position part 410 includes a top ball 411 and an elastic member 412. The gear position mating part 420 is a gear position groove. The top ball 411 is slidably disposed on the manual drive member 200 and can enter or disengage from the gear position groove. The elastic member 412 can apply a force to make the top ball 411 enter the gear position groove.

[0044] The elastic element 412 drives the top ball 411 to abut against the mounting base 100. Both the elastic element 412 and the top ball 411 are located at the receiving hole of the manual drive element 200. The manual drive element 200 rotates synchronously with the top ball 411 and the elastic element 412. When the manual drive element 200 rotates until the top ball 411 is aligned with the gear position groove, the top ball 411 is inserted into the gear position groove. When the user applies a large rotational force to the manual drive element 200, the periphery of the gear position groove abuts against the top ball 411 and disengages from the gear position groove. At this time, the elastic element 412 is compressed. The above-described gear position part 410 and gear position mating part 420 have a relatively simple structure and are easy to implement.

[0045] Specifically, the elastic element 412 is a spring. It is conceivable that in other embodiments, the elastic element 412 may also be a structure with high elasticity, such as a silicone block.

[0046] It is conceivable that in some other implementations, the gear position 410 may also be a gear position groove, in which case the gear position mating part 420 may adopt an elastic top ball 411.

[0047] Specifically, each gear engagement part 420 has two gear slots, and each corresponding gear part 410 has two top beads 411 and two elastic elements 412. The top beads 411 and the elastic elements 412 correspond one-to-one to enhance the gear feel.

[0048] In the embodiments, reference is made to Figure 4 The side wall of the receiving groove 310 is provided with a limiting block 330. The mounting seat 100 has a limiting position and a split position relative to the outer cover shell 300. The mounting seat 100 can rotate between the split position and the limiting position relative to the outer cover shell 300. In the split position, the limiting block 330 is offset from the mounting seat 100, and the mounting seat 100 can disengage from the receiving groove 310 along the depth direction of the receiving groove 310. In the limiting position, the limiting block 330 and the mounting seat 100 are opposite each other along the depth direction of the receiving groove 310, and the limiting block 330 stops the mounting seat 100 from disengaging from the receiving groove 310 along the depth direction of the receiving groove 310.

[0049] The outer cover 300 and the mounting base 100 are manufactured separately. During assembly, the mounting base 100 is inserted into the receiving groove 310 of the outer cover 300, at which point the mounting base 100 is in the disassembled position. Then, the outer cover 300 is rotated, causing the mounting base 100 to enter the limiting position. At this point, the limiting block 330 stops the mounting base 100 from disengaging from the receiving groove 310, completing the assembly of the outer cover 300 and the mounting base 100. When it is necessary to disassemble the outer cover 300, the outer cover 300 is rotated relative to the mounting base 100 until the mounting base 100 is rotated to the disassembled position, at which point the mounting base 100 and the outer cover 300 can be separated.

[0050] Specifically, the side wall of the receiving groove 310 is provided with two limiting blocks 330 around the rotation axis of the manual drive component 200, which provides a relatively stable and firm limiting effect on the mounting base 100.

[0051] In the embodiments, reference is made to Figure 3 The mounting base 100 is provided with an elastic snap-fit ​​portion 130 on its outer periphery, and the receiving groove 310 is provided with a snap-fit ​​mating portion 340 on its side wall. In the split position, the elastic snap-fit ​​portion 130 and the snap-fit ​​mating portion 340 are separated; in the limiting position, the elastic snap-fit ​​portion 130 and the snap-fit ​​mating portion 340 are snap-fitted together and restrict the mounting base 100 from rotating relative to the outer cover shell 300.

[0052] The flexible snap-fit ​​part 130 and the snap-fit ​​mating part 340 are provided so that when the mounting base 100 is in the limited position, it cannot rotate relative to the outer cover 300 to the split position, making it difficult for outsiders to arbitrarily disassemble the outer cover 300 and the mounting base 100, thereby improving the safety of the door lock back cover assembly.

[0053] In the embodiments, reference is made to Figure 3 The mounting base 100 has an integrally formed elastic snap-fit ​​portion 130 on its outer circumference. The elastic snap-fit ​​portion 130 includes a second elastic arm 131 and a snap block 132. The snap block 132 is connected to the second elastic arm 131 and is located on the side of the second elastic arm 131 near the groove wall of the receiving groove 310. The snap-fit ​​mating portion 340 is a snap-fit ​​groove. By integrally molding the second elastic arm 131 and the snap block 132 to form the elastic snap-fit ​​portion 130, the elastic snap-fit ​​portion 130 is elastic, has a simple structure, reduces the number of parts, simplifies the assembly process, and reduces costs.

[0054] In the embodiments, reference is made to Figure 5 It also includes an unlocking component 500. The outer cover 300 is provided with an unlocking through hole 350. In the limiting position, the unlocking through hole 350 is opposite to the elastic snap-fit ​​part 130. The unlocking component 500 can pass through the unlocking through hole 350 and push the elastic snap-fit ​​part 130 to elastically deform to a position separated from the snap-fit ​​mating part 340.

[0055] When the mounting base 100 is in the limited position relative to the outer cover 300, the elastic locking part 130 is engaged with the locking mating part 340, making it difficult for the mounting base 100 to rotate relative to the outer cover 300. Therefore, when it is necessary to separate the outer cover 300 and the mounting base 100, the unlocking part 500 passes through the unlocking through hole 350 to push the elastic locking part 130, causing the elastic locking part 130 to separate from the locking mating part 340. At this time, the mounting base 100 can rotate relative to the outer cover 300 to the separation position to separate the mounting base 100 and the outer cover 300. The assembly of the mounting base 100 and the outer cover 300 is relatively firm, and the separation process is relatively convenient.

[0056] Specifically, the unlocking component 500 has a pin that can pass through the unlocking through hole 350 and push against the elastic locking part 130.

[0057] In the embodiments, reference is made to Figure 4 The mounting base 100 has two elastic snap-fit ​​portions 130 on its outer periphery, and the outer cover 300 has two snap-fit ​​mating portions 340. The elastic snap-fit ​​portions 130 and the snap-fit ​​mating portions 340 correspond one-to-one. In the limiting position, the unlocking through hole 350 is opposite to the lowermost elastic snap-fit ​​portion 130, and the unlocking through hole 350 is located at the lower end of the outer cover 300. The provision of multiple elastic snap-fit ​​portions 130 facilitates a more secure and reliable snap-fit ​​between the mounting base 100 and the outer cover 300.

[0058] Specifically, one of the elastic locking parts 130 has a triangular locking block 132, and the corresponding locking groove is also a triangular groove, which plays a good role in preventing rotation. The unlocking through hole 350 also corresponds to this elastic locking part 130. The other elastic locking part 130 has a cylindrical locking block 132, and the locking groove is semi-circular.

[0059] It is conceivable that in some other embodiments, the elastic snap-fit ​​part 130 may also include a spring and a snap-fit ​​body, the snap-fit ​​body being provided with a snap-fit ​​groove, and the spring being able to drive the snap-fit ​​body to move elastically; the corresponding snap-fit ​​mating part 340 may be a snap-fit ​​block 132, the snap-fit ​​block 132 being able to snap into or disengage from the snap-fit ​​groove of the snap-fit ​​body.

[0060] Specifically, the hand drive component is a knob, which is simple in structure and easy to implement. Alternatively, the hand drive component can also be a handle.

[0061] Specifically, assembly markings are provided on the bottom wall of the receiving groove 310 and the mounting base 100 to facilitate the alignment and installation of the outer cover 300 and the mounting base 100.

[0062] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0063] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A door lock back cover assembly, characterized in that, include: Mounting base (100) is provided with door mounting structure (110); A manual drive unit (200) is rotatably mounted on the mounting base (100), and the manual drive unit (200) is used to drive the lock cylinder to move; The outer cover (300) is provided with a receiving groove (310), and the mounting base (100) is detachably connected to the receiving groove (310) of the outer cover (300). The outer cover (300) covers the door mounting structure (110). The bottom wall of the receiving groove (310) is provided with a clearance through hole (320), and the manual drive component (200) passes through the clearance through hole (320). The mounting base (100) is provided with an elastic abutment top (120), which abuts against the wall of the receiving groove (310); and / or the outer cover (300) is provided with an elastic abutment top (120) on the wall of the receiving groove (310), which abuts against the mounting base (100).

2. The door lock back cover assembly according to claim 1, characterized in that: The mounting base (100) is integrally formed with the elastic abutment top (120), the elastic abutment top (120) includes a first elastic arm (121) and a protrusion (122), the protrusion (122) is connected to the side of the first elastic arm (121) near the bottom wall of the receiving groove (310), and the protrusion (122) abuts against the bottom wall of the receiving groove (310).

3. The door lock back cover assembly according to claim 1, characterized in that: The mounting base (100) is provided with at least two elastic abutments (120) arranged around the rotation axis of the manual drive (200).

4. The door lock back cover assembly according to claim 1, characterized in that: It also includes a gear shift mechanism (400), which includes a gear shift part (410) and at least two gear shift mating parts (420). The gear shift part (410) is disposed on the manual drive member (200), and the gear shift mating parts (420) are disposed on the mounting base (100). The gear shift mating parts (420) are arranged around the rotation axis of the manual drive member (200). When the manual drive member (200) rotates relative to the mounting base (100), the gear shift part (410) can switch to engage with different gear shift mating parts (420).

5. The door lock back cover assembly according to claim 4, characterized in that: The gear position part (410) includes a top ball (411) and an elastic member (412). The gear position mating part (420) is a gear position groove. The top ball (411) is slidably disposed on the manual drive member (200) and can enter or disengage from the gear position groove. The elastic member (412) can apply a force to make the top ball (411) enter the gear position groove.

6. The door lock back cover assembly according to claim 1, characterized in that: The side wall of the receiving groove (310) is provided with a limiting block (330). The mounting seat (100) has a limiting position and a split position relative to the outer cover (300). The mounting seat (100) can rotate relative to the outer cover (300) between the split position and the limiting position. In the split position, the limiting block (330) is offset from the mounting seat (100), and the mounting seat (100) can disengage from the receiving groove (310) along the depth direction of the receiving groove (310). In the limiting position, the limiting block (330) and the mounting seat (100) are opposite each other along the depth direction of the receiving groove (310), and the limiting block (330) stops the mounting seat (100) from disengaging from the receiving groove (310) along the depth direction of the receiving groove (310).

7. The door lock back cover assembly according to claim 6, characterized in that: The mounting base (100) is provided with an elastic snap-fit ​​part (130) on its outer periphery, and the receiving groove (310) is provided with a snap-fit ​​mating part (340) on its side wall. In the split position, the elastic snap-fit ​​part (130) is separated from the snap-fit ​​mating part (340); in the limiting position, the elastic snap-fit ​​part (130) is snap-fitted with the snap-fit ​​mating part (340) and restricts the mounting base (100) from rotating relative to the outer cover shell (300).

8. The door lock back cover assembly according to claim 7, characterized in that: The outer circumference of the mounting base (100) is integrally formed with the elastic snap-fit ​​portion (130), the elastic snap-fit ​​portion (130) includes a second elastic arm (131) and a snap block (132), the snap block (132) is connected to the second elastic arm (131), the snap block (132) is located on the side of the second elastic arm (131) near the groove wall of the receiving groove (310), and the snap-fit ​​mating portion (340) is a snap groove.

9. The door lock back cover assembly according to claim 7, characterized in that: It also includes an unlocking component (500), and the outer cover (300) is provided with an unlocking through hole (350). In the limited position, the unlocking through hole (350) is opposite to the elastic snap-fit ​​part (130). The unlocking component (500) can pass through the unlocking through hole (350) and push the elastic snap-fit ​​part (130) to elastically deform to a position separated from the snap-fit ​​mating part (340).

10. The door lock back cover assembly according to claim 9, characterized in that: The mounting base (100) has at least two elastic snap-fit ​​parts (130) on its outer periphery, and the outer cover (300) has at least two snap-fit ​​mating parts (340). The elastic snap-fit ​​parts (130) and the snap-fit ​​mating parts (340) correspond one-to-one. At the limiting position, the unlocking through hole (350) is opposite to the lowermost elastic snap-fit ​​part (130), and the unlocking through hole (350) is located at the lower end of the outer cover (300).

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