CN210798508U - Door lock and linkage type unlocking mechanism thereof - Google Patents

Abstract

The utility model discloses a door lock and a linkage type unlocking mechanism thereof, the linkage unlocking mechanism is used for unlocking linkage of a lock bolt of the door lock and an anti-locking mechanism, a gear transmission column and the lock bolt are coaxially and rotatably arranged, a linkage piece can linearly displace relative to a middle frame of the door lock, the linkage piece is provided with a rack which is matched with a gear of the gear transmission column in a meshing way, and the linkage piece is provided with a transmission contact surface and a first groove which is matched with a handle pulling block; and is configured to: when the back locking knob block rotates to a back locking working position along a first direction, the back locking working surface is fit with the elastic piece in an attaching mode, and the transmission column abuts against the transmission contact surface; the handle pulling block can drive the linkage piece to move through the first groove, and the transmission column which is abutted against the transmission contact surface can drive the reverse locking knob block to rotate along the second direction to the unlocking working surface to be matched with the elastic piece in a fitting mode. By applying the scheme, on the basis of effectively improving user experience, the method and the device have better safety and adaptation stability.

Description

Door lock and linkage type unlocking mechanism thereof

Technical Field

The utility model relates to a lock safety control technical field, concretely relates to lock and coordinated type release mechanism thereof.

Background

With the continuous development of social economy, the work and home environment safety is concerned gradually, and people put forward higher requirements on the safety management of the door lock. As is well known, most of door locks have a back-locking function, for example, a sliding door lock uses a back-locking mechanism such as a back-locking knob and a back-locking button to achieve the back-locking function, so as to shield an unlocking function outside a door or lock an unlocking structure to prevent a stranger from opening the door lock from outside the door, thereby playing a role of protection and security.

In the prior art, the back locking structure of the push-pull lock is generally separated from the push-pull unlocking structure, and in actual operation, personnel in a door needs to relieve the back locking first to further open the push-pull lock, and the structure is complex and the operation is troublesome.

In view of this, need to carry out the optimal design to the structure of current lock urgently, on the basis of simplifying the structure, can effectively promote and remove the maneuverability that the back lock was unlocked and unblanked to effectively promote user experience.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem, the utility model provides a configuration optimization's lock and linkage release mechanism thereof to promote user experience comprehensively.

The utility model provides a pair of linkage release mechanism for the unblock linkage of lock spring bolt and anti-lock mechanism, anti-lock mechanism is including anti-lock knob piece, including gear drive post, linkage and the elastic component of setting on the lock center: the gear transmission column and the lock tongue are coaxially and rotatably arranged; the linkage piece can linearly displace relative to the middle frame of the door lock, is provided with a rack meshed and matched with the gear of the gear transmission column, and is provided with a transmission contact surface and a first groove matched with the handle pull block; the peripheral surface of the reverse locking knob block is matched with the elastic piece, and is sequentially provided with a reverse locking working surface, a transition surface and an unlocking working surface along the circumferential direction, and the reverse locking knob block presses the elastic piece through the transition surface to deform and is switched between an unlocking state and a reverse locking state; the reverse locking knob block is provided with a transmission column matched with the transmission contact surface, and the reverse locking knob block is configured into a structure that: when the reverse locking knob block rotates to a reverse locking working position along a first direction, the reverse locking working surface is fit with the elastic piece, and the transmission column is abutted against the transmission contact surface; the handle pulling block can drive the linkage piece to move through the first groove, and the transmission column which is abutted against the transmission contact surface can drive the reverse locking knob block to rotate along a second direction until the unlocking working surface is matched with the elastic piece in a fitting manner; wherein one of the first direction and the second direction is a clockwise direction and the other is a counterclockwise direction.

Preferably, the elastic part is a spring piece connected with the middle frame, the back locking working surface and the unlocking working surface matched with the spring piece are both planes, and the transition surface is an arc transition surface.

Preferably, the two ends of the spring plate are bent at right angles.

Preferably, the linkage piece comprises a rack transmission plate and a linkage plate which are fixedly connected; the rack gear plate has the rack and the first groove; the linkage plate is provided with a second groove, the transmission contact surface is formed on the groove wall of the second groove, the groove wall is perpendicular to the linear displacement direction, and the second groove is provided with a space which is adaptive to the rotation amplitude of the transmission column.

Preferably, the rack gear plate has a third groove, and the rack is formed at a sidewall of the third groove.

Preferably, the meshing teeth on the gear transmission column are arranged in a sector shape; the side walls of the two sides of the third groove are respectively and oppositely provided with the racks, and the gear on the gear transmission column can be meshed with the first rack or the second rack.

Preferably, the reverse locking knob block is symmetrically provided with two transmission columns, and a geometric center connecting line of the two transmission columns is parallel to the unlocking working surface; correspondingly, the second groove of the linkage plate is provided with two transmission contact surfaces, and the first transmission column and the first transmission contact surface as well as the second transmission column and the second transmission contact surface are respectively positioned at the same side; along the direct displacement direction, the first transmission contact surface and the second transmission contact surface are respectively positioned on two sides of the rotation center of the anti-locking knob block; and is configured to: the first transmission column, the first transmission contact surface and the first rack are a working group, and the second transmission column, the second transmission contact surface and the second rack are a working group.

Preferably, a direct displacement matching pair is arranged between the linkage plate and the middle frame.

Preferably, the size of the first slot is larger than that of the handle pull block along the linear displacement direction of the linkage piece.

The utility model also provides a door lock, which comprises a middle frame, a handle and a back locking knob, wherein the handle and the back locking knob are positioned on one side of the middle frame; the linkage unlocking mechanism is further included.

To the lock that has the anti-lock function, the utility model discloses creatively provide a linkage release mechanism to realize the unblock linkage of lock spring bolt and anti-lock mechanism. Specifically, the peripheral surface of the counter lock knob block is matched with the elastic piece, a counter lock working surface, a transition surface and an unlocking working surface are sequentially arranged along the circumferential direction, and the linkage relation between the counter lock knob block and a door lock bolt is realized by utilizing a transmission column and a linkage piece which are arranged on the counter lock knob block. When the door is locked reversely, the reverse locking knob block rotates until the reverse locking working surface of the reverse locking knob block is fit with the elastic piece, and meanwhile, the transmission post on the reverse locking knob block is abutted against the transmission contact surface on the linkage piece; namely, under the back locking working state, the preparatory adaptive relation of the unlocking linkage is constructed through the transmission column and the transmission contact surface. When the handle is operated to unlock in the door, the handle pulling block can drive the handle pulling block to linearly displace through the first groove on the linkage piece, and in the displacement process, the transmission contact surface on the linkage piece pushes the transmission column and drives the reverse locking knob block to reversely rotate until the unlocking working surface is matched with the elastic piece in a fitting manner, so that reliable unlocking is realized. Compared with the prior art, the utility model discloses following beneficial technological effect has:

first, the linkage piece of this scheme is through the rack and the gear drive post meshing transmission that set up on it, in the in-process that operating handle carries out the unblock, drive the spring bolt through the gear drive post with the coaxial rotation setting of spring bolt and unblank, from this, can realize opening anti-lock mechanism and main spring bolt in step when the door handle, utilize the cooperation transmission between linkage board and the anti-knob piece of locking to realize removing the setting of anti-lock mechanism when the main spring bolt is opened to the push-and-pull door handle, the operation that indoor personnel unblanked has been simplified, has simple structure and the higher characteristics of reliability. The scheme can be directly applied to the existing electronic door lock body and has higher practical application value; particularly, the lock can be unlocked by pushing and pulling the door handle in a back locking state, particularly, the escape can be quickly realized in a critical situation, and the emergency safety device has a remarkable emergency safety function.

Second, the utility model discloses an among the preferred scheme, its elastic component adopts the spring leaf that is connected with the center, and the anti-lock working face and the unblock working face of anti-lock knob piece are with the plane of spring leaf looks adaptation, in the actual work process, when carrying out the anti-lock, removing the anti-lock operation, act on the spring leaf middle section through the circular arc transition face, from this, through pressing the deformation ability of storing behind the spring leaf deformation, provide the effort that anti-lock knob piece rotated and resets. According to the arrangement, the plane matching pair is adopted to determine and enable the counter locking knob block to be kept at the counter locking working position or the unlocking working position, and the safety and the adaptation stability are better; in addition, the processing and assembling manufacturability of the design is better.

Thirdly, in another preferred scheme of the utility model, the linkage piece adopts a split design and is formed by fixedly connecting a rack transmission plate and a linkage plate; the structure matched with the handle pulling block and the gear transmission column is located on the rack transmission plate, and the structure matched with the transmission column of the reverse locking knob block is located on the linkage plate. On the basis of meeting the unlocking linkage function, the split type design can fully utilize the assembly space of the middle frame of the door lock, and meanwhile, the split type design can effectively reduce the part processing and manufacturing cost.

Fourth, the utility model discloses a transmission constitution design of still another preferred scheme should be two for two workgroups, transmission post, transmission contact surface and rack homogeneous phase design, and first transmission post, first transmission contact surface and first rack are a workgroup, and second transmission post, second transmission contact surface and second rack are a workgroup. So set up, can select for use according to the lock body structure of the different direction of opening the door, improve linkage unlocking structure's adaptability.

Drawings

FIG. 1 is an exploded view of the assembly of the door lock in an embodiment;

FIG. 2 is a side view of FIG. 1;

FIG. 3 is an exploded view of the assembled relationship of the lockback knob block, the resilient member and the linkage member in accordance with the present embodiment;

FIG. 4 is a schematic view of the engagement relationship between the locking knob block and the elastic member in the locking operation state;

FIG. 5 is a schematic view of the fit relationship between the counter lock knob block and the elastic member in an unlocking operation state;

FIG. 6 is a schematic view of the linked unlocking mechanism with the main bolt open and unlocked;

FIG. 7 is a schematic view of the linked unlocking mechanism in the unlocked state;

fig. 8 is a schematic view of the linked unlocking mechanism in the unlocked state.

In the figure:

the locking mechanism comprises a middle frame 1, a channel 11, a limiting guide post 12, a handle 2, a handle pull block 21, an anti-locking knob 3, an anti-locking knob block 4, a first transmission column 411, a second transmission column 412, an anti-locking working surface 42, a transition surface 43, an unlocking working surface 44, an elastic piece 5, a linkage piece 6, a rack transmission plate 61, a third groove 611, a first rack 6111, a second rack 6112, a first groove 612, a linkage plate 62, a second groove 621, a first transmission contact surface 6211, a second transmission contact surface 6212, a gear transmission column 7, a gear 71, a square pin hole 72 and a positioning point 73.

Detailed Description

In order to make the technical solutions of the present invention better understood by those skilled in the art, the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments.

Without loss of generality, the technical scheme of the linkage unlocking mechanism is explained in detail by the sliding door lock shown in fig. 1, and after the assembly is completed, the handle 2 and the back locking knob 3 on one side of the middle frame 1 are positioned on the inner side of the door, so that a user can conveniently perform corresponding operations in the door. It should be understood that the extension function of the main lock tongue of the sliding door lock does not substantially limit the linkage mechanism claimed in the present application.

Referring to fig. 1 and 2, fig. 1 is an exploded view illustrating the door lock according to the present embodiment; fig. 2 is a side view of fig. 1. As shown in the drawing, the lock reversing mechanism of the door lock applies a rotational force to the lock reversing knob block 4 through the lock reversing knob 3 so that the lock reversing knob block 4 is rotated to the lock reversing operation state.

In the scheme, the linkage unlocking mechanism is used for unlocking linkage of a lock tongue (not shown in the figure) of the door lock and the back locking mechanism, and specifically comprises a back locking knob block 4, an elastic piece 5, a linkage piece 6 and a gear transmission column 7 which is coaxially and rotatably arranged with the lock tongue.

Wherein, a gear 71 meshed with the rack is arranged on the gear transmission column 7; here, the gear post 7 is connected to a square driving pin (not shown) through the square pin hole 72, and the square driving pin controls the extension and contraction of the main latch.

The linkage piece 6 which can linearly displace relative to the door lock middle frame 1 is provided with racks (6111, 6112) which are meshed and matched with the gear 71 of the gear transmission column 7, and the positioning mark can be used as a positioning mark when the gear 71 and the first rack 6111 are installed through the positioning point 73. Moreover, the linkage 6 is also provided with transmission contact surfaces (6211, 6212) and a first groove 612 adapted to the handle pulling block 21, specifically, the handle pulling block 21 passes through the channel on the middle frame 2 and contacts with the first groove 612; here, the driving contact surfaces (6211, 6212) are adapted to be press-fit against the driving posts (411, 412) on the counter lock knob block 4.

Wherein, the elastic piece 5 arranged on the middle frame 1 of the door lock is matched with the peripheral surface of the anti-locking rotating block 4. Along the circumference, this back-locking rotatory piece 4's peripheral surface sets gradually back-locking working face 42, transition face 43 and unblock working face 44, and back-locking knob piece 4 presses elastic component 5 deformation through transition face 43 and switches between unblock state and back-locking state.

Referring to fig. 3, it is an exploded view of the assembly of the anti-lock knob block 4, the elastic member 5 and the link member 6. Is configured to: when the anti-locking knob block 5 rotates to the anti-locking working position along the first direction, the anti-locking working surface 42 on the anti-locking knob block is in fit with the elastic piece 5, as shown in fig. 4, and the transmission columns (411 and 412) are abutted against the transmission contact surfaces (6211 and 6212); the handle pulling block 21 can drive the linkage member 6 to displace through the first groove 612, and the transmission columns (411, 412) abutting against the transmission contact surfaces (6211, 6212) can drive the reverse locking knob block 4 to rotate along the second direction until the unlocking working surface 44 is fitted and matched with the elastic member 5, as shown in fig. 5; wherein one of the first direction and the second direction is a clockwise direction and the other is a counterclockwise direction. It should be understood that the specific direction may be determined according to the door opening direction and the anti-lock mechanism, corresponding to the anti-lock or anti-unlock rotation operation.

When the door is used, when the door is internally reversely locked, the reverse locking knob block 4 rotates until the reverse locking working surface 42 of the reverse locking knob block is matched with the elastic piece 5 in an attaching mode, and meanwhile, the first transmission column 411 (taking the transmission column as a linkage relation object) on the reverse locking knob block 4 is abutted against the first transmission contact surface 6211 on the linkage piece 6; that is, in the unlocking mode, the first transmission column 411 and the first transmission contact surface 6211 form a preliminary fitting relationship for the unlocking linkage. When the handle 2 is operated to unlock in the door, the handle shifting block 21 can drive the handle shifting block to linearly displace downwards through the first groove 612 on the linkage piece 6, and in the displacement process, the first transmission contact surface 6211 on the linkage piece 6 pushes the first transmission column 411 and drives the reverse locking knob block 4 to rotate in the reverse direction until the unlocking working surface 44 is fitted and matched with the elastic piece 5, so that reliable unlocking is realized.

Meanwhile, in the process of unlocking the operating handle 2, the lock tongue is driven to unlock through the gear transmission column 7 which is coaxially rotated with the lock tongue, and therefore the back locking mechanism and the main lock tongue can be synchronously unlocked when the door handle is used.

It should be noted that the elastic member 5 can be implemented in different ways, for example, it can be a spring plate connected to the middle frame 1, as long as it can be adapted to the anti-lock rotation block 4 and can be kept in the anti-lock working state or the unlocking working state. For example, but not limited to, the preferred embodiment is shown in the figures, the two ends of the elastic element 5 are inserted into the channels 11 of the middle frame 1 to form spring pieces; in the locked state, the back locking knob block 4 is rotated to enable the back locking working surface 42 to be attached to the long straight surface on the spring piece, at the moment, the device is in the locked state, and the transmission columns (411 and 412) on the back locking knob block 4 are in contact with the transmission contact surfaces (6211 and 6212) on the linkage piece 6. Of course, it may be designed that one end of the spring plate is inserted into a channel (not shown in the figure) of the middle frame 1, that is, the spring plate with only one end connected with the middle frame can be adapted to the anti-locking rotation block 4, and the anti-locking rotation block 4 is matched to switch between the unlocking state and the anti-locking state through pressing deformation.

Preferably, the two ends of the spring plate are bent at right angles to fit the channel 11, the two ends of the spring plate are embedded in the channel 11, and the spring plate is limited to move out of the channel 11 outside the channel 11 by fixing screws to the middle frame 2. On one hand, when the back locking operation and the back locking releasing operation are carried out, the arc transition surface 43 acts on the middle section of the spring piece, therefore, two ends of the spring piece can generate adaptable micro displacement in the channel 11, meanwhile, the side wall of the channel 11 can restrict the overall deformation quantity of the spring piece, and the deformation stored after deformation can provide the acting force for the rotation resetting of the back locking knob block. According to the arrangement, the plane matching pair is adopted to determine and enable the reverse locking knob block to be kept at the reverse locking working position or the unlocking working position, and a better machining and assembling process is provided.

As shown in the figure, the back locking working surface 42 and the unlocking working surface 44 which are matched with the spring sheet are both planes, and of course, the spring sheet has better matching stability and simple and reliable structure besides meeting the requirements of forming the back locking working state or the unlocking working state and maintaining the functions; the transition surface 43 is a circular arc transition surface, that is, the rotation adapting process is equivalent to a cam working surface, so as to ensure that the switching dynamic fit relation is smoothly realized.

In order to further control the manufacturing cost, the linkage member 6 adopts a split design. As shown in the figure, the linkage member 6 is fixedly connected by a rack transmission plate 61 and a linkage plate 62; wherein, the first groove 612 adapted to the handle pulling block 21 and the racks (6111, 6112) adapted to the gear transmission column 7 are formed on the rack transmission plate 61, the rack transmission plate 61 has a third groove 611, and the racks are formed on the side wall of the third groove 611. Wherein, the transmission contact surface (6211, 6212) is formed on the linkage plate 62, the linkage plate 62 has the second slot 621, the transmission contact surface (6211, 6212) is formed on the slot wall perpendicular to the linear displacement direction of the second slot 621, and the second slot 621 has the space adapted to the rotation amplitude of the transmission column (411, 412), so that the rotation process has no interference.

In practice, the rack gear plate 61 and the linkage plate 62 may be connected by rivets, threaded fasteners, or may be welded. On the basis of meeting the unlocking linkage function, the split type design can fully utilize the assembly space of the middle frame of the door lock, and meanwhile, the split type design can effectively reduce the part processing and manufacturing cost.

It can be understood that a direct displacement matching pair is arranged between the linkage plate 6 and the structure of the middle frame 1, for example, but not limited to, the limiting guide posts 12 are arranged on the middle frame 1 at two sides of the linkage plate 6, and the linear displacement matching pair is formed by matching with the two side plates of the linkage plate 6; of course, the design can also be adopted, a groove (not shown in the figure) is formed in the middle of the linkage plate 6 at a proper position, and the limiting guide post can be matched with the groove to reasonably perform spatial layout.

In order to further improve the adaptability of the linkage unlocking structure, two linkage structure working groups can be provided, so that one of the two linkage structure working groups can be selected according to the lock body structures in different door opening directions. Firstly, the meshing teeth on the gear transmission column 7 are arranged in a fan shape, namely, in a range of less than 180 degrees; correspondingly, racks are respectively oppositely arranged on the two side walls of the third groove 611, so that the gear 71 on the gear transmission column 7 can be meshed with the first rack 6111 or the second rack 6112.

In addition, two transmission columns (411, 412) are symmetrically arranged on the back locking knob block 4, wherein symmetry is that the transmission columns are symmetrically arranged relative to the rotation center of the back locking knob block 4, and the geometric center connecting line of the two transmission columns (411, 412) is parallel to the unlocking working surface, so that the back locking and unlocking action amplitudes of the two working groups are completely consistent; correspondingly, the second slot 621 of the linkage plate 62 has two transmission contact surfaces (6211, 6212), and the first transmission column 411 and the first transmission contact surface 6211, and the second transmission column 412 and the second transmission contact surface 6212 are respectively located at the same side; along the direct displacement direction, the first transmission contact surface 6211 and the second transmission contact surface 6212 are respectively positioned at two sides of the rotation center of the anti-locking knob block 4, namely, the relative design is realized; and is configured to: the first driving column 411, the first driving contact surface 6211 and the first rack 6111 form a working set, that is, in the first application situation, the gear 71 is meshed with the first rack 6111; the second drive column 412, the second drive contact face 6212 and the second rack 6112 form a working group, i.e. in the second application the gear 71 is engaged with the second rack 6112. Therefore, the lock body structure can be selected according to different door opening directions.

In addition, along the linear displacement direction of the linkage member 6, the size of the first groove 612 is larger than that of the handle pulling block 21, and in the non-locking state, the handle pulling block 21 is located in the middle of the first groove 612, and the upper part and the lower part of the handle pulling block are provided with reserved stroke gaps so as to avoid generating unnecessary interference.

Next, the operation principle of the linked unlocking mechanism according to the present embodiment will be briefly described with reference to the door lock assembly relationship in which the first rack 6111, the first transmission column 411, and the first transmission contact face 6211 are used as an operation group, and with reference to the retracted non-back-locked state of the main bolt shown in fig. 6 as an initial state.

In the unlocked state of the unlocking main bolt shown in fig. 6, the handle pulling block 21 is located at the middle position of the first groove 612, the unlocking working surface 44 on the unlocking knob block 4 is attached to the long straight surface of the spring plate 3, please refer to fig. 5, the transmission column (411, 412) is located at the middle position of the third groove 611 of the linkage plate 62 and is not in contact with the transmission contact surfaces (6211, 6212), and the positioning point 73 is located at the middle position of the gear-rack meshing portion.

Locking in a reverse mode: when the locking knob block 4 is rotated to the locking position shown in fig. 7, the locking surface 42 of the locking knob block 4 abuts against the long straight surface of the spring plate 3, and referring to fig. 4, the first transmission column 411 contacts with the first transmission contact surface 6211. The relative position relationship of other components is the same as the non-locking state in FIG. 6;

unlocking: when the handle 2 is pushed inwards relative to the surface of the inner panel middle frame 1, the handle pulling block 21 swings downwards for a certain angle along with the swinging of the handle 2; at the moment, the handle pulling block 21 is in contact with the contact surface of the square groove on the first groove 612 to push the rack transmission plate 61 to do linear motion, and the linkage plate 62 does linear motion along with the rack transmission plate 61 in the same direction; because the first transmission column 411 is contacted with the first transmission contact surface 6211, the linkage plate 62 pushes the counter locking knob block 4 to rotate, when the unlocking working surface 44 on the counter locking knob block 4 is jointed with the long straight surface on the spring piece 3, the counter locking knob block 4 stops rotating, and at the moment, the counter locking function of the counter locking mechanism is released; please refer to fig. 8 for an unlock state.

Meanwhile, the gear 71 is in meshed transmission with the first rack 6111, the linear motion of the rack transmission plate 61 drives the gear transmission column 7 to rotate, the gear transmission column 7 is connected with the square transmission pin through the square pin hole 72, and the square transmission pin and the gear transmission column 7 rotate in the same direction, so that the counter lock mechanism and the main bolt are synchronously opened when the door handle is pushed or pulled.

In addition to the above-mentioned linkage unlocking mechanism, the present embodiment also provides a door lock, which includes a middle frame 1, and functional components such as a handle 2 and a back locking knob 3 located on one side of the middle frame 1; the linkage unlocking mechanism is further included. Preferably, the door lock is a sliding door lock. Here, other functions of the door lock are not the core invention of the present application, and thus are not described herein again.

It should be noted that the above-mentioned embodiment provided by the present invention is not limited to the door lock assembly relationship shown in the drawings using the first rack bar 6111, the first transmission column 411 and the first transmission contact face 6211 as the power transmission working group, and it should be understood that the core concept is consistent with the present invention and is within the scope of the present application. In addition, the back locking mechanism connected with the back locking knob can be an electronic back locking mechanism, a mechanical back locking mechanism or a combination of multiple back locking structures, and can be specifically realized based on the prior art, so that the details are not repeated herein.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that it is obvious to those skilled in the art that various modifications and improvements can be made without departing from the principle of the present invention, and these modifications and improvements should also be considered as the protection scope of the present invention.

Claims (10)

1. Linkage release mechanism for the unblock linkage of lock spring bolt and anti-lock mechanism, anti-lock mechanism includes anti-lock knob piece, its characterized in that includes:

the gear transmission column is coaxially and rotatably arranged with the lock tongue;

the linkage piece can linearly displace relative to the middle frame of the door lock and is provided with a rack meshed and matched with the gear of the gear transmission column, and the linkage piece is provided with a transmission contact surface and a first groove matched with the handle pulling block; and

the elastic piece is arranged on the middle frame of the door lock;

the peripheral surface of the reverse locking knob block is matched with the elastic piece, and is sequentially provided with a reverse locking working surface, a transition surface and an unlocking working surface along the circumferential direction, and the reverse locking knob block presses the elastic piece through the transition surface to deform and is switched between an unlocking state and a reverse locking state; the reverse locking knob block is provided with a transmission column matched with the transmission contact surface, and the reverse locking knob block is configured into a structure that: when the reverse locking knob block rotates to a reverse locking working position along a first direction, the reverse locking working surface is fit with the elastic piece, and the transmission column is abutted against the transmission contact surface; the handle pulling block can drive the linkage piece to move through the first groove, and the transmission column which is abutted against the transmission contact surface can drive the reverse locking knob block to rotate along a second direction until the unlocking working surface is matched with the elastic piece in a fitting manner;

wherein one of the first direction and the second direction is a clockwise direction and the other is a counterclockwise direction.

2. The linkage unlocking mechanism according to claim 1, wherein the elastic member is a spring piece connected with the middle frame, the back locking working surface and the unlocking working surface matched with the spring piece are both flat surfaces, and the transition surface is an arc transition surface.

3. The linked unlocking mechanism according to claim 2, wherein both end portions of the spring plate are bent at right angles.

4. The linked unlock mechanism of claim 3, wherein said linkage member comprises fixedly attached:

a rack gear plate having the rack and the first groove; and

the linkage plate is provided with a second groove, the transmission contact surface is formed on the groove wall, perpendicular to the linear displacement direction, of the second groove, and the second groove is provided with a space adaptive to the rotation amplitude of the transmission column.

5. The linked unlocking mechanism according to claim 4, wherein the rack gear plate has a third groove, and the rack is formed on a side wall of the third groove.

6. The linked unlocking mechanism according to claim 5, wherein the meshing teeth on the gear transmission column are arranged in a sector shape; the side walls of the two sides of the third groove are respectively and oppositely provided with the racks, and the gear on the gear transmission column can be meshed with the first rack or the second rack.

7. The linkage unlocking mechanism according to claim 6, wherein the reverse locking knob block is symmetrically provided with two transmission columns, and a geometric center connecting line of the two transmission columns is parallel to the unlocking working surface; correspondingly, the second groove of the linkage plate is provided with two transmission contact surfaces, and the first transmission column and the first transmission contact surface as well as the second transmission column and the second transmission contact surface are respectively positioned at the same side; along the direct displacement direction, the first transmission contact surface and the second transmission contact surface are respectively positioned on two sides of the rotation center of the anti-locking knob block; and is configured to: the first transmission column, the first transmission contact surface and the first rack are a working group, and the second transmission column, the second transmission contact surface and the second rack are a working group.

8. The linked unlocking mechanism according to any one of claims 4 to 7, wherein a direct displacement engagement pair is provided between the linked plate and the center frame.

9. The linked unlocking mechanism according to claim 1, wherein the first slot has a size larger than that of the handle pull block in a direction of linear displacement of the link member.

10. The door lock comprises a middle frame, a handle and a back locking knob, wherein the handle and the back locking knob are positioned on one side of the middle frame; characterized in that, still include the linkage release mechanism of any one of claims 1 to 9.

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