CN212105460U

CN212105460U - Coupling, auxiliary unlocking device and door lock

Info

Publication number: CN212105460U
Application number: CN201922492830.1U
Authority: CN
Inventors: 李�根
Original assignee: TCL Technology Electronics Huizhou Co Ltd
Current assignee: TCL Technology Electronics Huizhou Co Ltd
Priority date: 2019-12-30
Filing date: 2019-12-30
Publication date: 2020-12-08
Anticipated expiration: 2029-12-30

Abstract

The utility model discloses a shaft coupling, supplementary unlocking means and lock, the utility model discloses a shaft coupling is including the main part, and this main part has first connecting portion and connects in the second connecting portion of first connecting portion, and first connecting portion are used for connecting and treat connection structure, and the link of transmission shaft is connected in the second connecting portion, and the transmission end is then connected in outside helping hand structure. In an embodiment, treat that connection structure is the handle of lock, under the drive of driving piece, the transmission shaft rotates and drives the rotation of second connecting portion, and first connecting portion rotate thereupon to this lock that the wrench movement is connected realizes supplementary unblanking or the function of shutting. On the basis, the connecting end can move relative to the second connecting part, so that the transmission end is close to or far away from the first connecting part, namely, the connecting distance of the transmission shaft can be correspondingly shortened or lengthened according to the actual size of the door or the door lock, and the compatibility of the coupler can be greatly improved.

Description

Coupling, auxiliary unlocking device and door lock

Technical Field

The utility model relates to a mechanical transmission technical field, in particular to shaft coupling, supplementary unlocking means and lock.

Background

With the rapid development of science and technology, more and more products begin to realize intellectualization at the present stage. At present, because the number and the popularization rate of original mechanical door locks are high, the original mechanical door locks cannot be completely replaced by intelligent locks with automatic unlocking and locking functions in a short time, and therefore an auxiliary switch lock device for automatically opening and closing is installed on the basis of the mechanical door locks.

In the related art, the compatibility of the auxiliary opening and closing lock device is poor, and the auxiliary opening and closing lock device is difficult to adapt to doors with different sizes and different structures.

The above is only for the purpose of assisting understanding of the technical solutions of the present application, and does not represent an admission that the above is prior art.

SUMMERY OF THE UTILITY MODEL

The main object of the utility model is to provide a coupler aims at improving the compatibility of shaft coupling

In order to achieve the above object, the utility model provides a coupler, coupler includes:

the connecting structure comprises a main body and a connecting structure, wherein the main body is provided with a first connecting part and a second connecting part connected with the first connecting part, and the first connecting part is used for connecting a structure to be connected; and

the transmission shaft is provided with a connecting end and a transmission end which are arranged oppositely, the connecting end is connected to the second connecting part and can move relative to the second connecting part, so that the transmission end is close to or far away from the first connecting part.

Optionally, the second connecting portion is provided with an insertion hole, and the connecting end is movably inserted into the insertion hole.

Optionally, the second connecting portion includes an axial limiting member, the connecting end is provided with an axial limiting hole penetrating through two opposite side surfaces of the connecting end, and the axial limiting hole extends along the axial direction of the transmission shaft;

the axial limiting piece penetrates through the axial limiting hole and the inserting hole.

Optionally, the second connecting portion includes a mounting seat, the first connecting portion includes a first mounting member, and the insertion hole is opened in the mounting seat;

the mounting seat is detachably connected to the first mounting part and can move relative to the first mounting part along the radial direction of the transmission shaft.

Optionally, a first limiting boss is formed on the surface of the mounting seat facing one side of the first mounting piece in a protruding manner, and a first connecting hole is formed in the first limiting boss;

the first mounting piece is provided with a first limiting hole, and the first limiting hole extends along the radial direction of the transmission shaft;

the first connecting part further comprises a first connecting piece, the first limiting boss is contained in the first limiting hole and protrudes out of the surface of one side, away from the mounting seat, of the first mounting piece, and the first connecting piece is inserted into the first connecting hole and abuts against the surface of the first limiting boss.

Optionally, the height range of the first limiting boss protruding from the surface of the first mounting part is 0.05mm-0.15 mm.

Optionally, the first connecting part comprises a second mounting part, the second mounting part is detachably connected to the first mounting part, and the second mounting part is connected to a structure to be connected.

Optionally, a connecting groove is formed in one side, away from the first mounting piece, of the second mounting piece, and at least part of the structure to be connected is accommodated in the connecting groove; and/or the presence of a gas in the gas,

the surface of one side, facing the first mounting piece, of the second mounting piece is convexly provided with a second limiting boss, and the second limiting boss is provided with a second connecting hole;

the first mounting piece is provided with a second limiting hole, and the second limiting hole extends along the radial direction of the transmission shaft and forms an included angle with the first limiting hole;

the second connecting part comprises a second connecting piece, the second limiting boss is contained in the second limiting hole and protrudes out of the surface of one side, facing the mounting seat, of the first mounting piece, and the second connecting piece is inserted into the second connecting hole and abuts against the surface of the second limiting boss.

The utility model discloses still provide an auxiliary unlocking device, auxiliary unlocking device includes driving piece and shaft coupling, the shaft coupling is as above the shaft coupling, the driving piece transmission connect in the transmission end.

The utility model also provides a lock, include as above supplementary unlocking means.

The utility model discloses an in the embodiment, the shaft coupling is one of supplementary unlocking means's accessory, and supplementary unlocking means is applied to the lock for realize the automatic function of unblanking or automatic shutting of lock. This shaft coupling is including the main part, and this main part has first connecting portion and connects in the second connecting portion of first connecting portion, and first connecting portion are used for connecting and treat the connection structure, the handle of lock promptly, and the link of transmission shaft is connected in the second connecting portion, and the transmission end is then connected in the driving piece. Under the general condition, the user is in indoor environment, through the handle of rotating the lock, can realize manual unblanking or shutting. The automatic opening and closing function of the door lock is realized under the condition that the original door lock is not disassembled. This supplementary unlocking means includes the driving piece and the utility model discloses a shaft coupling, this driving piece are connected with the controller communication of distal end, under the control of controller, driving piece drive transmission shaft rotates to the second connecting portion that drive the shaft coupling rotate, and the first connecting portion that is connected with it rotates thereupon, because first connecting portion are connected with the handle of lock, when first connecting portion rotate, the lock is turned round promptly, so realizes unblanking automatically or shutting. On the basis, the connecting end can move relative to the second connecting part, so that the transmission end is close to or far away from the first connecting part, namely, the connecting distance of the transmission shaft can be correspondingly shortened or lengthened according to the actual size or structure of the door or the door lock, and the compatibility of the coupler is improved to a greater degree.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

Fig. 1 is a schematic structural diagram of an embodiment of the coupling of the present invention;

FIG. 2 is an exploded view of the coupling shown in FIG. 1;

FIG. 3 is a top plan view of the coupling shown in FIG. 1;

FIG. 4 is a cross-sectional view of the coupling shown in FIG. 3 taken along A-A;

FIG. 5 is an enlarged detail view of the point A shown in FIG. 4;

fig. 6 is a cross-sectional view of the coupling shown in fig. 3 taken along the direction B-B.

The reference numbers illustrate:

the objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that all the directional indicators (such as upper, lower, left, right, front and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicator is changed accordingly.

In addition, the descriptions related to "first", "second", etc. in the present invention are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit ly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and/or" appearing throughout is to include three juxtapositions, exemplified by "A and/or B," including either the A or B arrangement, or both A and B satisfied arrangement. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.

Referring to fig. 1-6, the present invention provides a coupling 10.

In the embodiment of the present invention, the shaft coupling 10 includes:

a main body 100, wherein the main body 100 has a first connecting portion 110 and a second connecting portion 120 connected to the first connecting portion 110, and the first connecting portion 110 is used for connecting a structure to be connected; and

the transmission shaft 200 has a connecting end 210 and a driving end 220, wherein the connecting end 210 is connected to the second connecting portion 120 and can move relative to the second connecting portion so that the driving end 220 is close to or far away from the first connecting portion 110.

The utility model discloses technical scheme is through adopting transmission shaft 200 to move for second connecting portion 120 to this compatibility that has improved shaft coupling 10. Specifically, in an embodiment of the utility model, this shaft coupling 10 is one of them accessory of supplementary unlocking means, and this supplementary unlocking means specifically is applied to the lock, and the lock has the handle. Under the general condition, the user is in indoor environment, through rotating this handle, can realize unblanking. In order to realize remote automatic unlocking of the door lock without detaching the original door lock, the auxiliary unlocking device comprises a driving piece and the coupling 10, wherein the driving piece is in communication connection with a remote controller, under the control of the controller, the driving piece drives the transmission shaft 200 to rotate and drives the second connecting part 120 of the coupling 10 to rotate, the first connecting part 110 connected with the driving piece rotates along with the second connecting part, the first connecting part 110 is connected with the door lock, and the door lock is twisted, so that the auxiliary automatic unlocking or locking function is realized. On the basis, since the connecting end 210 can move relative to the second connecting portion 120, the transmission end 220 is close to or far from the first connecting portion 110, that is, the connection distance of the transmission shaft 200 can be correspondingly shortened or lengthened according to the actual size structure of the door or the door lock, so that the compatibility of the coupling 10 is greatly improved.

It should be noted that, in the present application, the first connecting portion 110 is connected to the door lock, and the second connecting portion 120 is connected to the driving member through the transmission shaft 200, that is, the structure to be connected is a handle of the door lock in the present embodiment, and the coupling 10 is equivalent to the transmission structure disposed between the door lock and the driving member. It will therefore be understood that the structure to be connected includes, but is not limited to, the handle of a door lock, i.e. the coupling 10 can also be used in other mechanical transmission fields, such as: robots, automobiles, intelligent products, etc., as long as they are used as mechanical transmission structures, will not be described in detail herein. Correspondingly, the structures of the first connecting portion 110 and the second connecting portion 120 are also specifically configured according to the structures to be connected, which need to be connected, that is, the first connecting portion 110 and the second connecting portion 120 may be configured as a screw connecting structure or a snap connecting structure, and the structures of the first connecting portion 110 and the second connecting portion 120 are not limited specifically.

In an embodiment of the present invention, in order to facilitate the installation of the transmission shaft 200, the second connecting portion 120 is provided with an insertion hole 122a, and the connecting end 210 is inserted into the insertion hole 122 a.

Specifically, the second connecting portion 120 includes a mounting seat 122, and the material of the mounting seat 122 may be a plastic material or a metal, which is not limited herein. The mounting seat 122 is disposed in a cylindrical shape, and a cylindrical axis of the mounting seat 122 is provided with an insertion hole 122a penetrating through two opposite side surfaces of the mounting seat 122, and the cross section of the insertion hole 122a is in a waist shape. The opposite ends of the transmission shaft 200 are respectively a transmission end 220 and a connection end 210 connected with each other, the cross section of the transmission end 220 is circular, and the cross section of the connection end 210 is kidney-shaped, and the size of the cross section of the connection end is slightly smaller than that of the insertion hole 122a, so that the connection end 210 can be inserted into the insertion hole 122 a.

When the connecting end 210 is inserted into the insertion hole 122a and moves along the axial direction of the insertion hole 122a, the transmission shaft 200 is prevented from being released from the insertion hole 122a during the transmission process. In one embodiment of the present application, the connecting end 210 further has an axial limiting hole 210a, and the axial limiting hole 210a extends along the axial direction of the transmission shaft 200, that is, the axial limiting hole 210a is a bar-shaped hole. The second connecting portion 120 further includes an axial limiting member 123, specifically, the axial limiting member 123 includes a screw and a nut adapted to the screw, and the mounting base 122 is provided with an avoiding hole communicated with the insertion hole 122 a. The connecting end 210 of the transmission shaft 200 is inserted into the insertion hole 122a, and one end of the screw extends into the insertion hole 122a through the avoiding hole, passes through the axial limiting hole 210a of the transmission shaft 200, and is connected to the nut at the other end, so that the transmission shaft 200 is limited in the insertion hole 122 a. In the using process, the transmission shaft 200 can move in the inserting hole 122a to adapt to doors and door locks with different sizes; meanwhile, the transmission shaft 200 can be prevented from loosening in the insertion hole 122a by the limiting action of the axial limiting piece 123, and the stability of the transmission shaft in the transmission process is ensured.

In another embodiment of the present invention, a stop surface is disposed on a side of the insertion hole 122a facing the driving end 220 of the transmission shaft 200, that is, the insertion hole 122a is a stepped hole, and the connecting end 210 of the transmission shaft 200 is formed with a stop flange along a radial protrusion. The connecting end 210 is received in the inserting hole 122a and moves in the inserting hole 122a, the driving end 220 is close to or far from the mounting seat 122, and the stopping flange can abut against the stopping surface of the inserting hole 122 a. The stop flange is abutted against the stop surface of the insertion hole 122a, so that the transmission shaft 200 can be limited in the insertion hole 122a, the transmission shaft is prevented from being separated from the mounting seat 122 in the transmission process, the axial limiting hole 210a does not need to be formed in the connecting end 210, and the axial limiting piece 123 is omitted. The strength of the drive shaft 200 is thus higher, while the construction of the coupling 10 is simpler.

It can be understood that, in the present application, the axial limiting member 123 adopts a screw and a nut to limit the connecting end 210 of the transmission shaft 200 in the inserting hole 122a, the connecting structure is simpler and the connection is also more stable, and the installation of the transmission shaft 200 and the axial limiting member 123 is also more convenient. Of course, the axial stop 123 may have other types of connection structures. Specifically, in other embodiments of the present invention, the axial limiting member 123 includes a pin, a pin hole is opened on the mounting seat 122, the pin hole is communicated with the insertion hole 122a, and after the connecting end 210 is inserted into the insertion hole 122a, the pin extends into the insertion hole 122a through the pin hole and penetrates through the axial limiting hole 210 a. So can also realize the limiting displacement to transmission shaft 200 to adopt the pin joint in the pin downthehole, make shaft coupling 10's structure further simplify, also can avoid the user to dismantle at will simultaneously, influence the use.

In order to further improve the compatibility of the shaft coupling 10, in an embodiment of the present invention, the first connecting portion 110 includes a first mounting part 111, and the mounting seat 122 is detachably connected to the first mounting part 111 and can move relative thereto along the radial direction of the transmission shaft 200.

Specifically, the first mounting member 111 is disposed in a cylindrical shape as a whole, and is provided with a first limiting hole 111a penetrating through the upper and lower surfaces of the first mounting member, the first limiting hole 111a extends along the radial direction of the transmission shaft 200, that is, the first limiting hole 111a extends along the radial direction of the first mounting member 111, and the first limiting hole 111a is in a kidney-shaped hole shape. The surface of the mounting seat 122 facing the first mounting part 111 is convexly provided with a first limiting boss 1221, and the maximum external dimension of the first limiting boss 1221 is slightly smaller than the first limiting hole 111 a. When the first mounting member 111 is connected to the mounting base 122, the first limiting boss 1221 is accommodated in the first limiting hole 111a, and since the maximum outer dimension of the first limiting boss 1221 is smaller than the diameter of the first limiting hole 111a, the mounting base 122 can reciprocate along the extending direction of the first limiting hole 111 a. Meanwhile, since the extending direction of the first limiting hole 111a is perpendicular to the axial direction of the transmission shaft 200, the transmission shaft 200 can not only extend and contract in the insertion hole 122a in the axial direction, but also move along with the mounting seat 122 in the radial direction. This increases the freedom of movement of the drive shaft 200 so that the coupling 10 can be more adaptable to different door and door lock configurations.

When the first limit boss 1221 is received in the first limit hole 111a, the first mounting member 111 is prevented from being separated from the mounting seat 122. The utility model discloses in, first connecting hole 1221a has still been seted up on first spacing boss 1221, and this first connecting hole 1221a can be screw hole or cotter hole, and first connecting portion 110 is still including first connecting piece 113, and this first connecting piece 113 can set up to screw or pin correspondingly. When the first limiting boss 1221 is received in the first limiting hole 111a, the first connecting member 113 is connected in the first connecting hole 1221a and abuts against the first mounting member 111 or the surface of the first limiting boss 1221, so that the first mounting member can be pressed or limited on the surface of the first mounting base 122.

It can be understood that, when the first limiting member is connected to the first connection hole 1221a and abuts against the surface of the first mounting member 111, the first mounting member 111 is firmly pressed against the surface of the mounting base 122, and the connection between the first mounting member 111 and the mounting member is relatively stable. But to facilitate the user in adjusting the relative positions of the first mounting member 111 and the mounting base 122 during use. The utility model discloses an in the embodiment, first spacing boss 1221 holding is in first spacing hole 111a, and first spacing boss 1221 protrudes in the surface that first installed part 111 deviates from mount pad 122 one side, and screw connection is in first connecting hole 1221a to the butt is on first spacing boss 1221's surface, and the limiting displacement through the screw head makes mount pad 122 in the motion for first installed part 111, avoids first installed part 111 and mount pad 122 to break away from. Therefore, the user can adjust the relative position between the first mounting member 111 and the mounting seat 122 without detaching the first connecting member 113, which is further convenient for the user to adjust the coupler 10 according to the structure of the door and the door lock.

Referring to fig. 5 again, in order to make the connection between the first mounting part 111 and the mounting seat 122 more stable, the relative displacement is not generated during the use process, and the user can conveniently adjust the relative position between the first mounting part 111 and the mounting seat 122. In an embodiment of the present application, the height of the first limiting projection 1221 protruding from the surface of the first mounting member 111 ranges from 0.05mm to 0.15 mm.

Specifically, the height of the first limiting boss 1221 protruding from the surface of the first mounting element 111 is H, that is, the first connecting element 113 is inserted into the first connecting hole 1221a and abuts against the surface of the first limiting boss 1221, and the gap between the first connecting element 113 and the first mounting element 111 is H. In the actual assembling process, when the first connecting member 113 abuts against the surface of the first limiting boss 1221, the first limiting boss 1221 is elastically deformed to a certain extent, and thus the gap between the actual first connecting member 113 and the first limiting boss 1221 is smaller than H. In the present application, by setting the range of H to 0.05mm to 0.15mm, preferably, the value of H may be 0.05mm, 0.1mm, 0.15 mm. When the first connecting member 113 is inserted into the first connecting hole 1221a, the first connecting member 113 abuts against the surface of the first limiting projection 1221, and due to the elastic deformation of the first limiting projection 1221, the first connecting member 113 will be attached to or abut against the surface of the first mounting member 111. It can be understood that when the H value is too small, the first connecting element 113 abuts against the surface of the first limiting projection 1221 and also abuts against the surface of the first mounting element 111, and at this time, although the connection between the first mounting element 111 and the mounting base 122 is relatively stable, it is inconvenient for the user to adjust the relative position between the first mounting element 111 and the mounting base 122. On the contrary, when the value of H is too large, after the first connecting element 113 is inserted into the first connecting hole 1221a, the gap formed between the first connecting element 113 and the surface of the first mounting element 111 is large, and at this time, although the user can adjust the relative position between the first mounting element 111 and the mounting base 122 with less effort, the gap exists between the first connecting element 113 and the first mounting element 111, or the abutting stress is small, so that the first mounting element 111 and the mounting base 122 are easy to displace during the installation or use process, thereby affecting the use. By setting the height within the range of H, the stress value of its abutment is just within a threshold. In this way, the first mounting member 111 and the mounting seat 122 are not displaced in a natural state, so that the normal use of the coupling 10 is ensured. When the position of the transmission shaft 200 needs to be adjusted, the first connecting piece 113 does not need to be loosened, and a user can overcome the friction force between the first connecting piece 113 and the first mounting piece 111 in a labor-saving manner, move the first mounting piece 111 and the mounting seat 122, and further adjust the position of the transmission shaft 200 in the radial direction. The position adjustment operation of the transmission shaft 200 is more convenient while the compatibility of the coupling 10 is improved.

It will be appreciated that the coupling 10 can be adapted to different handles, since the handles of different door locks have different configurations. In an embodiment of the present invention, the first connecting portion 110 includes a second mounting member 112, and the second mounting member 112 is detachably connected to the first mounting member 111.

Specifically, the second mounting member 112 is overall cylindrical, and the surface of the first mounting member 111 side is convexly provided with a second limiting boss 1121, the second limiting boss 1121 is provided with a second connecting hole 1121a, the first mounting member 111 is provided with a second limiting hole 111b, the second limiting hole 111b is arranged along the radial extension of the moving shaft, that is, the second limiting hole 111b extends along the radial extension of the second mounting member 112, and the direction in which the second limiting hole 111b extends on the first mounting member 111 in the present application forms an included angle of 90 ° with the extending direction of the first limiting hole 111 a. Assembly of the second mounting member 112 is described above with reference to the assembly of the first mounting member 111 with the mounting block 122. That is, the second limiting protrusion 1121 is accommodated in the second limiting hole 111b and protrudes out of the surface of the first mounting element 111 facing the mounting seat 122, and the second connecting element 121 is inserted into the second connecting hole 1121a and abuts against the surface of the second limiting protrusion 1121, so that the second mounting element 112 and the first mounting element 111 are stably connected, and the user can conveniently adjust the relative position between the first mounting element 111 and the second mounting element 112. The surface of the second mounting part 112 facing away from the first mounting part 111 is provided with a connecting groove 111c, and when the coupling 10 is mounted on a door or a door lock, the handle of the door lock is received in the connecting groove 111 c. When transmission shaft 200 rotated under the drive of driving piece, first installed part 111 rotated and drove second installed part 112 and rotated, and the groove lateral wall butt of spread groove 111c is in the handle, so can twist the handle, realizes unblanking or shutting.

Through can dismantle in this application and connect in first installed part 111 at second installed part 112, convenience of customers changes different second installed part 112 according to the shape and the size of handle correspondingly. The second mounting member 112 is provided with a connecting groove 111c, the handle is accommodated in the connecting groove 111c, and the connecting groove 111c abuts against the handle to achieve unlocking or locking. On the one hand, the second mounting member 112 is relatively simple in construction and facilitates the installation of the coupling 10. On the other hand, the second mounting part 112 is movable relative to the first mounting part 111, i.e. the second mounting part 112 is displaceable relative to the transmission shaft 200 in the horizontal and vertical planes, so that the coupling 10 can be better adapted to different door and door lock structures, and the compatibility of the coupling 10 is further improved.

The utility model discloses still provide an auxiliary unlocking device, this auxiliary unlocking device include driving piece and shaft coupling 10, and above-mentioned embodiment is referred to this shaft coupling 10's concrete structure, because this auxiliary unlocking device has adopted the whole technical scheme of above-mentioned all embodiments, consequently has all beneficial effects that the technical scheme of above-mentioned embodiment brought at least, and the repeated description is no longer given here.

The utility model also provides a lock, this lock include supplementary unlocking means, and above-mentioned embodiment is referred to supplementary unlocking means's concrete structure, because this lock has adopted the whole technical scheme of above-mentioned all embodiments, consequently has all beneficial effects that the technical scheme of above-mentioned embodiment brought at least, no longer gives unnecessary details here one by one.

The above only is the preferred embodiment of the present invention, not limiting the scope of the present invention, all the equivalent structure changes made by the contents of the specification and the drawings under the inventive concept of the present invention, or the direct/indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A coupling, characterized in that said coupling comprises:

2. The coupling of claim 1 wherein the second connecting portion defines an insertion hole, and the connecting end is movably inserted into the insertion hole.

3. The coupling according to claim 2, wherein the second connecting portion comprises an axial limiting member, the connecting end is provided with axial limiting holes penetrating through two opposite side surfaces of the connecting end, and the axial limiting holes are arranged along the axial extension of the transmission shaft;

4. The coupling of claim 2, wherein the second connecting portion comprises a mounting seat, the first connecting portion comprises a first mounting member, and the insertion hole is provided in the mounting seat;

5. The coupling according to claim 4, wherein a first limiting boss is convexly formed on the surface of one side of the mounting seat facing the first mounting piece, and a first connecting hole is formed on the first limiting boss;

6. The coupling of claim 5 wherein said first stop projection projects from said first mount member surface by a height in the range of 0.05mm to 0.15 mm.

7. A coupling according to any one of claims 5 to 6 wherein the first connection comprises a second mounting member which is releasably connected to the first mounting member, the second mounting member being connected to a structure to be connected.

8. The coupling of claim 7, wherein a connecting groove is formed in a side of the second mounting member facing away from the first mounting member, and the structure to be connected is at least partially accommodated in the connecting groove; and/or the presence of a gas in the gas,

9. An auxiliary unlocking device, characterized in that the auxiliary unlocking device comprises a driving member and a coupling, the coupling is the coupling of any one of claims 1 to 8, and the driving member is connected to the transmission end in a transmission manner.

10. A door lock characterized by comprising the auxiliary unlocking means as claimed in claim 9.