Indoor room door lock

Abstract

The utility model provides an indoor room door lock which comprises a lock box, an outer handle, an inner handle, a square rod assembly and a jackscrew, and a conical section is arranged at the front end of the jackscrew. The square rod assembly is formed by overlapping a first rod body and a second rod body; the edges of the same sides of the overlapped surfaces of the first rod body and the second rod body are respectively provided with an inclined surface, and the inclined surfaces form a wedge-shaped groove with a triangular cross section after the first rod body and the second rod body are overlapped; the inner handle is provided with a threaded hole, the first end of the square rod assembly is fixedly connected into the first square rod groove of the outer handle, and the second end of the square rod assembly penetrates through the square rod hole and then is assembled into the second square rod groove of the inner handle. The jackscrew is connected into the threaded hole in a threaded mode, and the first rod body and the second rod body which are overlapped are opened under the action of the jackscrew. According to the utility model, the square rod assembly can be tightly matched with the square rod hole in the lock box, so that the square rod assembly is completely stressed when the handle is pulled to open and close the door.

Description

Technical Field

[0001] The utility model relates to the field of locks, and more specifically, to an indoor door lock. Background Art

[0002] At present, handle locks have been widely used on indoor doors, and their styles and designs are diverse. However, during the use of existing handle locks, when the handle on one side of the indoor door is pulled, the handle on the other side of the indoor door will also be stressed. After long-term use, the handle will become loose, resulting in an unsmooth operation when using the handle to open the door, and even causing the handle to fall off. Summary of the Utility Model

[0003] The technical problem to be solved by the utility model is to provide a new indoor door lock in view of the problem that the handle of the above-mentioned handle lock is prone to looseness after long-term use.

[0004] The technical solution of the utility model to solve the above technical problem is to provide an indoor door lock, which includes a lock box for installing on the indoor door, an outer handle for installing on the outer side of the indoor door, and an inner handle for installing on the inner side of the indoor door. The lock box is provided with a square rod hole, the connecting column of the outer handle has a first square rod groove, and the connecting column of the inner handle has a second square rod groove; the indoor door lock further includes a square rod assembly and a set screw, and the front end of the set screw has a conical section in a conical shape;

[0005] The square rod assembly is formed by overlapping a first rod body and a second rod body which are respectively in a strip shape, and the cross-sectional dimension of the overlapped first rod body and second rod body is smaller than the cross-sectional dimension of the square rod hole; the same-side edges of the overlapping surfaces of the first rod body and the second rod body respectively have inclined surfaces, and the inclined surfaces form a wedge-shaped groove with a triangular cross-section after the first rod body and the second rod body are overlapped, and the included angle between the two groove walls of the wedge-shaped groove is smaller than the apex angle of the conical section;

[0006] The inner handle is provided with a threaded hole, and the threaded hole penetrates from the outer side surface of the inner handle to the second square rod groove; the first end of the square rod assembly is fixedly connected to the first square rod groove of the outer handle, the second end of the square rod assembly passes through the square rod hole and is assembled into the second square rod groove of the inner handle, and the wedge-shaped groove faces the threaded hole; the set screw is threadedly connected to the threaded hole, and the set screw is embedded into the wedge-shaped groove through the conical section to open the second ends of the overlapped first rod body and second rod body, and make the cross-section of the first rod body and the second rod body in the square rod hole adapt to the cross-section of the square rod hole.

[0007] As a further improvement of the present utility model, the first ends of the first rod body and the second rod body have first pin holes arranged coaxially, the outer handle has a second pin hole, and the second pin hole penetrates through two opposite groove walls of the first square rod groove; the first end of the square rod assembly is fixed together by a pin shaft inserted into the first pin hole and the second pin hole.

[0008] As a further improvement of the present utility model, the distance between two groove walls in the second square rod groove that are parallel to the central axis of the threaded hole is greater than the distance between two hole walls in the square rod hole that are parallel to the central axis of the threaded hole, and the second ends of the first rod body and the second rod body are locked and fixed in the second square rod groove of the inner handle by a setscrew embedded in the wedge-shaped groove.

[0009] As a further improvement of the present utility model, the cross-sectional dimension of the first square rod groove is smaller than the cross-sectional dimension of the square rod hole.

[0010] As a further improvement of the present utility model, the lock box has a plurality of third through-connection holes surrounding the square rod hole; the indoor door lock further includes a first inner cover ring, a second inner cover ring, a plurality of first through-connection screws and a plurality of first through-connection nut posts; the first inner cover ring includes a first central through-hole and a plurality of first through-connection holes arranged around the first central through-hole, and the second inner cover ring includes a second central through-hole and a plurality of second through-connection holes arranged around the second central through-hole;

[0011] The first inner cover ring is installed on the outer side of the indoor door in such a way that the first central through-hole is coaxial with the square rod hole and a plurality of first through-connection holes are respectively coaxial with a plurality of third through-connection holes, the second inner cover ring is installed on the inner side of the indoor door in such a way that the second central through-hole is coaxial with the square rod hole and a plurality of second through-connection holes are respectively coaxial with a plurality of third through-connection holes, the square rod assembly passes through the first central through-hole and the second central through-hole, and a plurality of the first through-connection screws respectively pass through the second through-connection holes and are threadedly connected with a plurality of first through-connection nut posts passing through the first through-connection holes.

[0012] As a further improvement of the present utility model, the indoor door lock includes a first bearing and a second bearing, and the inner diameter of the first bearing is adapted to the outer diameter of the connecting column of the outer handle, and the inner diameter of the second bearing is adapted to the outer diameter of the connecting column of the inner handle;

[0013] The first inner cover ring has a first groove provided around the first central through hole. The second inner cover ring has a second groove provided around the second central through hole. The first bearing is arranged in the first groove, and the second bearing is arranged in the second groove. A connecting post on the outer handle is inserted into the inner ring of the first bearing, and a connecting post on the inner handle is inserted into the inner ring of the second bearing.

[0014] As a further improvement of the present invention, the first through-connection holes are non-circular, and the second through-connection holes are circular; the first through-connection screw includes a screw head, and the screw head has a driving groove; the first through-connection nut post includes a column cap and an anti-rotation section adjacent to the column cap. The shape of the cross-section of the anti-rotation section is the same as the shape of the first through-connection hole, and the anti-rotation section cooperates with the first through-connection hole to prevent the first through-connection nut post from rotating.

[0015] As a further improvement of the present invention, the indoor door lock includes a first handle outer cover and a second handle outer cover. The first handle outer cover covers the outside of the first inner cover ring, and the second handle outer cover covers the outside of the second inner cover ring.

[0016] As a further improvement of the present invention, the indoor door lock includes a first elastic washer and a second elastic washer. The first elastic washer is installed between the outer handle and the first handle outer cover, and the second elastic washer is installed between the inner handle and the second handle outer cover.

[0017] As a further improvement of the present invention, the lock box has a lock core hole. The indoor door lock includes a lock core, a third inner cover ring, a fourth inner cover ring, a first lock core outer cover, a second lock core outer cover, a plurality of second through-connection screws, and a plurality of second through-connection nut posts.

[0018] The present invention has the following beneficial effects: A square rod assembly is formed by overlapping the first rod body and the second rod body and passing through the square rod hole on the lock box. A set screw is embedded into the wedge-shaped groove between the first rod body and the second rod body to expand the overlapped first rod body and the second rod body, so that the square rod assembly is tightly fitted with the square rod hole on the lock box. When pulling the handle to open or close the door, the square rod assembly bears the force completely, avoiding the problem of the handle becoming loose after long-term use. Description of the Drawings

[0019] Figure 1 It is a schematic diagram of the indoor door lock provided by the embodiment of the present invention installed on an indoor door.

[0020] Figure 2 It is a schematic diagram of the exploded structure of the handle system in the indoor door lock provided by the embodiment of the present invention.

[0021] Figure 3 This is a schematic diagram of the assembly structure of the outer door handle and the square rod assembly in the indoor door lock provided by the embodiment of the present utility model.

[0022] Figure 4 This is a cross-sectional schematic diagram of the assembly structure of the inner door handle and the square rod in the indoor door lock provided by the embodiment of the present utility model.

[0023] Figure 5 This is a schematic diagram of the assembly structure of the first inner cover ring, the first bearing, and the first through-connection nut column in the indoor door lock provided by the embodiment of the present utility model.

[0024] Figure 6 This is a disassembled schematic diagram of the lock core fixing part in the indoor door lock provided by the embodiment of the present utility model. Detailed implementation manners

[0025] In order to make the purpose, technical solutions and advantages of the present utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0026] As Figure 2-4 shown, this is a schematic diagram of the structure of the indoor door lock provided by the embodiment of the present utility model. This indoor door lock can be applied to indoor doors such as the room doors of residences and the internal room doors of offices, as Figure 1 shown, and realizes the privacy protection and security of the indoor space. The indoor door lock of this embodiment includes a lock box 30, an outer door handle 21, and an inner door handle 22. The lock box 30 is installed in the installation groove on the indoor door 10. The outer door handle 21 is installed on the outer side of the indoor door 10, and the inner door handle 22 is installed on the inner side of the indoor door 10. Similar to the existing indoor door locks, the above lock box 30 includes a lock box and components such as transmission gears, lock tongues, and springs located inside the lock box (wherein the lock tongue can protrude from the edge of the indoor door 10 under the action of the spring). The lock box 30 also has a square rod hole. The front end of the outer door handle 21 has a connecting column 211 and a first square rod groove 212 is provided on the connecting column 211. The front end of the inner door handle 22 has a connecting column 221 and a second square rod groove is provided on the connecting column 221. The above first square rod groove 212 and the second square rod groove are respectively arranged along the axial direction of the square rod hole. The shapes and structures of the above lock box 30, outer door handle 21, and inner door handle 22 can all adopt the conventional solutions in the art and will not be elaborated here.

[0027] In this embodiment, the above-mentioned indoor door lock further includes a square rod assembly 23 and a setscrew 40. The setscrew 40 includes a cylindrical section and a conical section. The cylindrical section is cylindrical and has an external thread on its outer circumference. The conical section is located at the front end of the cylindrical section and is conical. The tail end of the cylindrical section has a driving groove (such as an internal hexagonal hole), which facilitates driving the setscrew 40 to rotate. The square rod assembly 23 is formed by overlapping a first rod body 231 and a second rod body 232 that are respectively strip-shaped. The above-mentioned first rod body 231 and second rod body 232 are respectively linear, and the size of the cross-section of the first rod body 231 and the second rod body 232 after overlapping is smaller than the size of the square rod hole on the lock box 30 (that is, the shape of the first rod body 231 and the second rod body 232 after overlapping is similar to that of the existing square rod), so that when installing, it is convenient for the square rod assembly 23 to be inserted into the square rod hole of the lock box 30. In this embodiment, the same-side edges of the overlapping surfaces of the first rod body 231 and the second rod body 232 respectively have inclined surfaces, and the above-mentioned inclined surfaces form a wedge-shaped groove 233 with a triangular cross-section after the first rod body 231 and the second rod body 232 are overlapped. The inner door handle 22 has a threaded hole 222. The shape and size of the cylindrical section of the setscrew 40 are adapted to the shape and size of the threaded hole 222, and the threaded hole 222 penetrates from the outer side surface of the inner door handle 22 to the second square rod groove.

[0028] The first end of the square rod assembly 23 is fixedly connected to the first square rod groove of the outer door handle 11. The second end of the square rod assembly 23 passes through the square rod hole and is assembled into the second square rod groove of the inner door handle 22, and the wedge-shaped groove 233 faces the threaded hole 222. The setscrew 40 is threadedly connected to the threaded hole 222, and the setscrew 40 is embedded into the wedge-shaped groove 233 through the conical section to open the second ends of the overlapping first rod body 231 and second rod body 232, and make the cross-section of the first rod body 231 and the second rod body 232 in the square rod hole adapt to the cross-section of the square rod hole, that is, the distance between the top surface (the surface facing away from the overlapping surface) of the first rod body 231 and the bottom surface (the surface facing away from the overlapping surface) of the second rod body is equal to the distance between the corresponding surfaces on the square rod hole, so that the first rod body 231 and the second rod body 232 are clamped in the square rod hole. In this way, when pulling the outer door handle 21 or the inner door handle 22 to open the door, only the square rod assembly 23 is stressed, avoiding stress on the internal mating parts.

[0029] Those skilled in the art can understand that in order to make the first rod body 231 and the second rod body 232 open under the action of the setscrew 40, the included angle between the two groove walls of the wedge-shaped groove of the overlapping first rod body 231 and second rod body 232 is less than or equal to the apex angle of the conical section of the setscrew 40. And, for the convenience of operating the setscrew 40, the depth of the second square rod groove on the inner door handle 22 is greater than the axial length of the connecting column 221 of the inner door handle 22, that is, the part where the second square rod groove extends outside the connecting column 221 of the inner door handle 22, and the threaded hole 222 is located in this part.

[0030] The above-mentioned indoor door lock forms a square rod assembly 23 passing through the square rod hole on the lock box 30 by overlapping the first rod body 231 and the second rod body 232. The setscrew 40 is embedded into the wedge-shaped groove 233 between the first rod body 231 and the second rod body 232 to open the overlapping first rod body 231 and second rod body 232, so that the square rod assembly 23 is tightly fitted with the square rod hole on the lock box 30. When pulling the handle to open or close the door, the square rod assembly 23 bears all the force, avoiding the problem of the handle becoming loose after long-term use.

[0031] As Figure 3 shown, in an embodiment of the present invention, the first ends of the first rod body 231 and the second rod body 232 have coaxially arranged first pin holes 234. Correspondingly, the outer handle 21 has a second pin hole 213 (for example, the second pin hole 213 can be located on the connecting column 211), and the second pin hole 213 penetrates through two opposite groove walls of the first square rod groove 212. The first end of the square rod assembly 23 is fixed together by a pin shaft 214 inserted into the first pin hole 234 and the second pin hole 213. In this way, when the second ends of the first rod body 231 and the second rod body 232 open under the action of the setscrew 40, the gap between the first ends of the first rod body 231 and the second rod body 232 can also change accordingly, facilitating the clamping of the first rod body 231 and the second rod body 232 in the square rod hole of the lock box 30. Of course, in actual applications, the first end of the square rod assembly 23 can also be fixed in the first square rod groove 212 by other means, such as interference fit, etc., but the connection stability is relatively poor.

[0032] As Figure 4 shown, in an embodiment of the present invention, the distance between two groove walls parallel to the central axis of the threaded hole 222 in the second square rod groove on the inner handle 22 is greater than the distance between two hole walls parallel to the central axis of the threaded hole in the square rod hole, and the second ends of the first rod body 231 and the second rod body 232 are locked and fixed in the second square rod groove of the inner handle 22 by a setscrew embedded in the wedge-shaped groove 233. Since both the first rod body 231 and the second rod body 232 are straight, considering the positional relationship between the square rod hole and the second square rod groove, with the above structure, the locking and fixing of the square rod assembly 23 in the second square rod groove can be achieved without other components.

[0033] Moreover, since the distance between two groove walls parallel to the central axis of the threaded hole 222 in the second square rod groove is greater than the distance between two hole walls parallel to the central axis of the threaded hole in the square rod hole, correspondingly, when the second ends of the first rod body 231 and the second rod body 232 are locked in the second square rod groove, the distance between the top surface of the first rod body 231 and the bottom surface of the second rod body 232 is greater than the distance between the corresponding two groove walls in the square rod hole, so that the square rod assembly 23 cannot be pulled out from the outside of the indoor door, achieving anti-theft to a certain extent. In particular, the cross-sectional dimension of the first square rod groove is smaller than the cross-sectional dimension of the square rod hole.

[0034] Combined with Figure 2 、 Figure 5 As shown, in an embodiment of the present utility model, the above-mentioned lock box 30 has a number of third through-connection holes surrounding the square rod hole. Correspondingly, the indoor door lock further includes a first inner cover ring 24, a second inner cover ring 25, a number of first through-connection screws 27 and a number of first through-connection nut posts 26. The first inner cover ring 24 includes a first central through-hole 241 and a number of first through-connection holes 242 arranged around the first central through-hole 241. The structure of the second inner cover ring 25 is similar to that of the first inner cover ring 24, and it includes a second central through-hole and a number of second through-connection holes arranged around the second central through-hole. The first inner cover ring 24 is installed on the outer side of the indoor door 10 with the first central through-hole 241 coaxial with the square rod hole and the number of first through-connection holes coaxial with the number of third through-connection holes respectively. The second inner cover ring is installed on the inner side of the indoor door 10 with the second central through-hole coaxial with the square rod hole and the number of second through-connection holes coaxial with the number of third through-connection holes respectively. The square rod assembly 23 passes through the first central through-hole 241 and the second central through-hole, and a number of first through-connection screws 27 pass through the second through-connection holes respectively and are threadedly connected to a number of first through-connection nut posts 26 passing through the first through-connection holes 242.

[0035] The outer door handle 21 and the inner door handle 22 are respectively installed on the first inner cover ring 24 and the second inner cover ring 25, thus realizing the assembly of the outer door handle 21 and the inner door handle 22.

[0036] In order to make the outer door handle 21 and the inner door handle 22 rotate smoothly, in an embodiment of the present utility model, the above-mentioned indoor door lock includes a first bearing 244 and a second bearing, and the size of the inner ring of the first bearing 244 is adapted to the outer circumference of the connecting column 211 of the outer door handle 21, and the size of the inner ring of the second bearing is adapted to the outer circumference of the connecting column 221 of the inner door handle 22; correspondingly, the first inner cover ring 24 has a first groove 243 arranged around the first central through-hole 241 (the shape and size of the first groove 243 are adapted to the shape and size of the first bearing 244), the first bearing 244 is arranged in the first groove 243, and the connecting column 211 on the outer door handle 21 is inserted into the inner ring of the first bearing 244 (the inner ring of the first bearing 244 is smaller than the inner diameter of the first through-hole 241); similarly to the first inner cover ring 24, the second inner cover ring 25 has a second groove arranged around the second central through-hole, the second bearing is arranged in the second groove, and the connecting column 221 of the inner door handle 22 is inserted into the inner ring of the second bearing (the inner ring of the second bearing is smaller than the inner diameter of the second through-hole).

[0037] Since the outer door handle 21 and the inner door handle 22 are respectively fixed by the first bearing 244 and the second bearing, their smooth rotation can be ensured.

[0038] As shown Figure 5 in the figure, in an embodiment of the present utility model, the first pair of through connection holes 242 on the above-mentioned first inner cover ring 24 are regular hexagons, and in practical applications, they can also be other non-circular shapes, while the second pair of through connection holes on the second inner cover ring 25 are circular. Correspondingly, the first pair of through connection screws 27 include screw heads, and the screw heads have driving grooves (such as cross grooves, hexagonal grooves, etc.); and the first pair of through connection nut posts 26 include a cap 261 and a torque prevention section 262 adjacent to the cap 261, wherein there is no driving groove on the cap 261, the cross-sectional shape of the torque prevention section 262 is the same as the shape of the first pair of through connection holes 242, and the torque prevention section 262 cooperates with the first pair of through connection holes 242 to prevent the first pair of through connection nut posts 26 from rotating. Through the above method, the first pair of through connection screws 27 and the first pair of through connection nut posts can only be removed from the inner side of the indoor door, and cannot be removed from the outside, further increasing the anti-theft effect.

[0039] In an embodiment of the present utility model, the above-mentioned indoor door lock includes a first handle outer cover 281 and a second handle outer cover 282. The first handle outer cover 281 covers the outside of the first inner cover ring 24, and the second handle outer cover 282 covers the outside of the second inner cover ring 25. Specifically, a tight fit method can be adopted to fix the first handle outer cover 281 and the first inner cover ring 24, and the second handle outer cover 282 and the second inner cover ring 25 respectively. Through the above method, structures such as the first pair of through connection nut posts 26 and the first pair of through connection screws 27 can be hidden, making the appearance of the indoor door lock neat and beautiful.

[0040] In addition, the above-mentioned indoor door lock may further include a first elastic washer 291 and a second elastic washer 292. The first elastic washer 291 is installed between the outer handle 21 and the first handle outer cover 281, and the second elastic washer 292 is installed between the inner handle 22 and the second handle outer cover 282, thereby reducing the noise generated by the friction between hard materials and reducing wear at the same time.

[0041] Combined with Figure 6 as shown in the figure, the lock box 30 of the above-mentioned indoor door lock also has a lock core hole. Correspondingly, the indoor door lock includes a lock core, a third inner cover ring 51, a fourth inner cover ring 52, a first lock core outer cover 55, a second lock core outer cover 56, a plurality of second pair of through connection screws 54, a plurality of second pair of through connection nut posts 53, etc. Through the above structure, the fixation of the lock core can be realized, and the fixation method of the lock core can be similar to the fixation method of the square rod assembly 23.

[0042] As described above, it is only the preferred specific embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present utility model should be covered within the protection scope of the present utility model. Therefore, the protection scope of the present utility model should be subject to the protection scope of the claims.

Claims

1. An indoor door lock, comprising a lock box for installation on an indoor door, an outer door handle for installation on the outer side of the indoor door, and an inner door handle for installation on the inner side of the indoor door. The lock box has a square rod hole, the connecting column of the outer door handle has a first square rod groove, and the connecting column of the inner door handle has a second square rod groove; it is characterized in that, The indoor door lock further includes a square rod assembly and a setscrew, and the front end of the setscrew has a conical section in a conical shape; The square rod assembly is formed by overlapping a first rod body and a second rod body which are respectively in a long strip shape, and the cross-sectional dimension of the overlapped first rod body and second rod body is smaller than the cross-sectional dimension of the square rod hole; on the same-side edges of the overlapping surfaces of the first rod body and the second rod body, there are inclined surfaces respectively, and the inclined surfaces form a wedge-shaped groove with a triangular cross-section after the first rod body and the second rod body are overlapped, and the included angle between the two groove walls of the wedge-shaped groove is smaller than the apex angle of the conical section; The inner handle has a threaded hole, and the threaded hole penetrates from the outer side surface of the inner handle to the second square rod groove; the first end of the square rod assembly is fixedly connected in the first square rod groove of the outer handle, the second end of the square rod assembly passes through the square rod hole and is assembled into the second square rod groove of the inner handle, and the wedge-shaped groove faces the threaded hole; the setscrew is threadedly connected in the threaded hole, and the setscrew is embedded into the wedge-shaped groove through the conical section to open the second ends of the overlapped first rod body and second rod body, and make the cross-section of the first rod body and the second rod body in the square rod hole adapt to the cross-section of the square rod hole.

2. The indoor door lock according to claim 1, characterized in that, The first ends of the first rod body and the second rod body have coaxially arranged first pin holes, the outer handle has a second pin hole, and the second pin hole penetrates through two opposite groove walls of the first square rod groove; the first end of the square rod assembly is fixed together by a pin shaft inserted into the first pin hole and the second pin hole.

3. The indoor door lock according to claim 1, characterized in that, The distance between the two groove walls parallel to the central axis of the threaded hole in the second square rod groove is greater than the distance between the two hole walls parallel to the central axis of the threaded hole in the square rod hole, and the second ends of the first rod body and the second rod body are locked and fixed in the second square rod groove of the inner handle by the setscrew embedded in the wedge-shaped groove.

4. The indoor door lock according to claim 1, characterized in that, The cross-sectional dimension of the first square rod groove is smaller than the cross-sectional dimension of the square rod hole.

5. The indoor door lock according to any one of claims 1-4, characterized in that The lock box has a number of third through-connection holes surrounding the square rod hole; the indoor door lock further includes a first inner cover ring, a second inner cover ring, a number of first through-connection screws and a number of first through-connection nut posts; the first inner cover ring includes a first central through-hole and a number of first through-connection holes arranged around the first central through-hole, and the second inner cover ring includes a second central through-hole and a number of second through-connection holes arranged around the second central through-hole; The first inner cover ring is installed on the outer side of the indoor door in such a way that the first central through-hole is coaxial with the square rod hole and a number of first through-connection holes are respectively coaxial with a number of third through-connection holes, the second inner cover ring is installed on the inner side of the indoor door in such a way that the second central through-hole is coaxial with the square rod hole and a number of second through-connection holes are respectively coaxial with a number of third through-connection holes, the square rod assembly passes through the first central through-hole and the second central through-hole, and a number of the first through-connection screws respectively pass through the second through-connection holes and are threadedly connected with a number of first through-connection nut posts passing through the first through-connection holes.

6. The indoor door lock according to claim 5, characterized in that, The indoor door lock includes a first bearing and a second bearing, and the size of the inner ring of the first bearing is adapted to the outer circumference of the connecting column of the outer handle, and the size of the inner ring of the second bearing is adapted to the outer circumference of the connecting column of the inner handle; The first inner cover ring has a first groove provided around the first central through hole, the second inner cover ring has a second groove provided around the second central through hole, the first bearing is arranged in the first groove, the second bearing is arranged in the second groove, and the connecting column on the outer handle is inserted into the inner ring of the first bearing, and the connecting column of the inner handle is inserted into the inner ring of the second bearing.

7. The indoor door lock according to claim 5, characterized in that, The first through connection hole is non-circular, and the second through connection hole is circular; the first through connection screw includes a screw head, and the screw head has a driving groove; the first through connection nut column includes a column cap and an anti-twist section adjacent to the column cap, and the shape of the cross section of the anti-twist section is the same as the shape of the first through connection hole, and the anti-twist section cooperates with the first through connection hole to prevent the first through connection nut column from rotating.

8. The indoor door lock according to claim 5, characterized in that The indoor door lock includes a first handle outer cover and a second handle outer cover, the first handle outer cover covers the outside of the first inner cover ring, and the second handle outer cover covers the outside of the second inner cover ring.

9. The indoor door lock according to claim 8, wherein The indoor door lock includes a first elastic washer and a second elastic washer, the first elastic washer is installed between the outer handle and the first handle outer cover, and the second elastic washer is installed between the inner handle and the second handle outer cover.

10. The indoor door lock according to any one of claims 1-4, characterized in that, The lock box has a lock core hole, and the indoor door lock includes a lock core, a third inner cover ring, a fourth inner cover ring, a first lock core outer cover, a second lock core outer cover, a plurality of second through connection screws and a plurality of second through connection nut columns.

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