CN113482452A

CN113482452A - Automatic lock

Info

Publication number: CN113482452A
Application number: CN202110953135.XA
Authority: CN
Inventors: 沈洪华; 李�浩; 牛永杰; 梁波
Original assignee: Suzhou Basecare Medical Device Co ltd
Current assignee: Suzhou Basecare Medical Device Co ltd
Priority date: 2021-08-19
Filing date: 2021-08-19
Publication date: 2021-10-08

Abstract

The invention relates to an automatic lock comprising: the lock comprises a lock body and a locking mechanism, wherein the locking mechanism comprises a bolt, and the locking mechanism is slidably arranged through the lock body; the automatic unlocking mechanism and the mechanical unlocking mechanism can drive the locking mechanism to slide relative to the lock body, and the mechanical unlocking mechanism and the automatic unlocking mechanism are respectively arranged on the adjacent side surfaces of the lock body. The automatic lock of above-mentioned scheme is through establishing mechanical unlocking mechanism and automatic unlocking mechanism respectively in the adjacent side of lock body, for example when running through the lock body about with locking mechanism, set up automatic unlocking mechanism at the top of lock body, set up mechanical unlocking mechanism in the dead ahead of lock body, utilize such distribution mode, and the adjustment of cooperation correlation structure is optimized, reduce the volume of automatic lock body, make automatic lock occupation space little, can be applicable to and use in the narrow and small space, the application scope of automatic lock has been widened.

Description

Automatic lock

Technical Field

The invention relates to the technical field of locks, in particular to an automatic lock.

Background

With the advancement of technology and the continuous maturity of the lock industry, more and more mechanical locks are replaced by automatic locks. The traditional mechanical lock is unlocked by using a mechanical key to rotate a lock cylinder, a square bolt and an oblique bolt of a lock body are withdrawn, the lock is unlocked by using a handle, the automatic lock has a new unlocking mode, and the lock can be unlocked by pressing the handle through simple operations such as fingerprint, password, card swiping and the like. Just because the automatic lock is more convenient than the mechanical lock operation, the use of automatic lock is gradually extensive, and the application range of automatic lock no longer restricts in door lock, apartment lock, hotel lock, indoor lock, cabinet lock etc. of registering one's residence.

Generally, in order to ensure the safety and reliability of the automatic lock, a mechanical lock cylinder is usually configured and provided with a mechanical unlocking function, so that the automatic lock can be unlocked mechanically when a driving part of the automatic lock fails. However, the automatic lock body is large in size and large in occupied space due to the arrangement, and is not suitable for being used in narrow space, so that the application range of the automatic lock is limited.

Disclosure of Invention

Based on this, it is necessary to provide an automatic lock, which aims to solve the problem of large volume of the automatic lock body in the prior art.

The application provides an automatic lock, automatic lock includes:

a lock body which is provided with a lock hole,

the locking mechanism comprises a bolt and is slidably arranged through the lock body;

the lock comprises an automatic unlocking mechanism and a mechanical unlocking mechanism, wherein the automatic unlocking mechanism and the mechanical unlocking mechanism can drive the lock tongue to slide relative to the lock body, and the mechanical unlocking mechanism and the automatic unlocking mechanism are respectively arranged on the adjacent side surfaces of the lock body.

According to the automatic lock with the scheme, the mechanical unlocking mechanism and the automatic unlocking mechanism are respectively arranged on the adjacent side faces of the lock body, for example, the locking mechanism penetrates through the lock body from left to right, the automatic unlocking mechanism is arranged at the top of the lock body, and the mechanical unlocking mechanism is arranged right in front of the lock body. At this time, in the left-right direction, the size of the automatic lock is the width of the lock body and the moving distance of the locking mechanism; in the up-down direction, the size of the automatic lock is the height of the automatic unlocking mechanism and the lock body; in the front-rear direction, the size of the automatic lock is the thickness of the mechanical unlocking mechanism and the lock body. In the prior art, the mechanical unlocking mechanism and the automatic unlocking mechanism are arranged on two opposite side faces of the locking mechanism in the moving direction, and the maximum size of the automatic lock at the moment is the sum of the sizes of the mechanical unlocking mechanism, the automatic unlocking mechanism, the lock body and the locking mechanism. Compared with the prior art, the distribution mode provided by the invention reduces the volume of the automatic lock, so that the automatic lock occupies a small space, can be applied to a narrow space, and widens the application range of the automatic lock.

The technical solution of the present application is further explained below:

in one embodiment, the locking mechanism further comprises a blocking piece, and the blocking piece is connected with the bolt through the lock body. When the automatic unlocking mechanism and the mechanical unlocking mechanism drive the lock tongue to move, the blocking piece keeps moving synchronously with the lock tongue.

In one embodiment, the locking mechanism further comprises a guide member disposed between the locking bolt and the catch, the guide member slidably extending through the lock body.

In one embodiment, the automatic unlocking mechanism comprises a motor and a transmission pair, the transmission pair comprises a driving part and a driven part, the driving part is connected with the motor, and the driven part is connected with the lock tongue.

In one embodiment, the mechanical unlocking mechanism comprises a rotating shaft and a cam, the axis of the rotating shaft is the rotation axis of the cam, the cam can rotate between a first rotation position and a second rotation position under the action of external force, the distance between the rotation axis and the bolt is smaller than the maximum distance between the rotation axis and the outer contour of the cam, when the cam is located at the first rotation position, the bolt is located at the locking position, and when the cam is located at the second rotation position, the bolt is located at the unlocking position; in the process that the cam is switched to the second rotating position from the first rotating position, the outer contour of the cam drives the lock tongue to move to the unlocking position. When the cam is located at the first rotating position, the lock tongue is locked, when the rotating shaft drives the cam to rotate, the cam rotates from the first rotating position to the second rotating position, and when the cam is switched to the second rotating position from the first rotating position, the cam pushes the lock tongue to retreat, so that unlocking is achieved.

In one embodiment, the mechanical unlocking mechanism further includes a limiting member, the limiting member and the mechanical unlocking mechanism are located on the same side of the lock body, a distance between the limiting member and the rotation axis is greater than a minimum distance between the rotation axis and the outer contour of the cam, a distance between the limiting member and the rotation axis is less than a maximum distance between the rotation axis and the outer contour of the cam, and the limiting member is located in a range covered by the outer contour of the cam when the cam rotates. The limiting piece is positioned on a rotating path of the outer contour when the cam rotates, so that the limiting piece can be positioned on one side of the cam to block the rotation of the cam.

In one embodiment, the cam outer contour includes a cam surface on a side of the cam close to the lock tongue, a slot provided on a side of the cam far from the lock tongue, and a guiding arc surface between the slot and the cam surface, the stopper is provided on a side of the cam far from the lock tongue, and when the cam surface is located at a first rotation position, the slot abuts against the stopper.

In one embodiment, during the process that the cam surface rotates from the second rotation position to the first rotation position, the guide arc surface is in relative sliding fit with the limiting member.

In one embodiment, the cam mechanism further comprises an elastic member disposed between the limiting member and the rotating shaft, the elastic member is configured to make the cam surface have a tendency to move toward the first rotating position, and the elastic member drives the cam to rotate close to the limiting member, that is, the cam is in a state of abutting against the limiting member without an external force.

In one embodiment, two ends of the rotating shaft are respectively and rotatably connected to the lock body and a fixing plate, and the fixing plate is detachably connected to the lock body.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention.

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is an exploded view of an automatic lock according to an embodiment of the present invention;

FIG. 2 is an exploded view of the structure of FIG. 1 from another perspective;

FIG. 3 is an assembled side view of FIG. 1;

FIG. 4 is a schematic view of the assembled state of FIG. 1;

FIG. 5 is a schematic view of the structure of FIG. 4 from another perspective;

fig. 6 is a schematic view of the cam structure of fig. 1.

Description of reference numerals:

100. automatic locking; 110. a lock body; 120. a locking mechanism; 121. a latch bolt; 122. a baffle plate; 123. a guide member; 130. an automatic unlocking mechanism; 131. a motor; 132. a transmission pair; 1321. a driving member; 1322. a driven member; 140. a mechanical unlocking mechanism; 141. a rotating shaft; 142. a cam; 1421. a cam surface; 1422. a card slot; 1423. a rotation axis; 1424. a guiding cambered surface; 143. a limiting member; 144. an elastic member; 145. a fixing plate; 146. shaft clamping; 147. an anti-theft screw.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

The preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

As shown in fig. 1 to 2, an automatic lock 100 is shown in an embodiment of the present application, where the automatic lock 100 includes: the lock comprises a lock body 110 and a locking mechanism 120, wherein the locking mechanism 120 comprises a bolt 121, and the locking mechanism 120 is slidably arranged through the lock body 110; and the automatic unlocking mechanism 130 and the mechanical unlocking mechanism 140, the automatic unlocking mechanism 130 and the mechanical unlocking mechanism 140 can drive the bolt 121 to slide relative to the lock body 110, and the mechanical unlocking mechanism 140 and the automatic unlocking mechanism 130 are respectively arranged on the adjacent side surfaces of the lock body 110.

In the automatic lock 100 of the above-described embodiment, the mechanical unlocking mechanism 140 and the automatic unlocking mechanism 130 are respectively disposed on adjacent sides of the lock body 110, for example, the locking mechanism 120 penetrates the lock body 110 from left to right, the automatic unlocking mechanism 130 is disposed on the top of the lock body 110, and the mechanical unlocking mechanism 140 is disposed directly in front of the lock body 110. At this time, in the left and right direction, the size of the automatic lock 100 is the width of the lock body 110 and the moving distance of the locking mechanism 120; in the up-down direction, the size of the automatic lock 100 is the height of the automatic unlocking mechanism 130 and the lock body 110; in the front-rear direction, the dimension of the automatic lock 100 is the thickness of the mechanical unlocking mechanism 140 and the lock body 110. Whereas the mechanical unlocking mechanism 140 and the automatic unlocking mechanism 130 are disposed on two opposite sides of the moving direction of the locking mechanism 120 in the prior art, the maximum size of the automatic lock 100 should be the sum of the sizes of the mechanical unlocking mechanism 140, the automatic unlocking mechanism 130, the lock body 110 and the locking mechanism 120. Compared with the prior art, the distribution mode provided by the invention reduces the volume of the automatic lock 100, so that the automatic lock 100 occupies a small space and can be applied to a narrow space, and the application range of the automatic lock 100 is widened.

With continued reference to fig. 1 to fig. 5, further, the locking mechanism 120 further includes a blocking piece 122, and the blocking piece 122 is connected to the latch tongue 121 through the lock body 110. When the automatic unlocking mechanism 130 and the mechanical unlocking mechanism 140 drive the latch bolt 121 to move, the catch 122 keeps moving synchronously with the latch bolt 121.

In the present embodiment, the flap 122 is used with a sensor in the automatic lock 100, and the sensor feeds back and transmits a position signal of the flap 122 to the motor 131 to control the opening and closing of the motor 131.

With continuing reference to fig. 1 to fig. 2, the locking mechanism 120 further includes a guiding member 123, the guiding member 123 is disposed between the latch tongue 121 and the blocking piece 122, and the guiding member 123 slides through the lock body 110.

In this embodiment, the guiding member 123 may be a guide post, the lock body 110 is provided with a through hole, the guide post passes through the through hole, and two ends of the guide post are respectively connected to the locking tongue 121 and the blocking piece 122, so that the guide post, the locking tongue 121 and the blocking piece 122 move synchronously.

With reference to fig. 1 to fig. 5, further, the automatic unlocking mechanism 130 includes a motor 131 and a transmission pair 132, the transmission pair 132 includes a driving element 1321 and a driven element 1322, the driving element 1321 is connected to the motor 131, and the driven element 1322 is connected to the latch bolt 121.

In this embodiment, the motor 131 is a speed reducing motor, and the transmission pair 132 is a rack-and-pinion structure, in which a gear serves as the driving member 1321 and a rack serves as the driven member 1322. The gear is connected with the output end of the speed reducing motor and can rotate clockwise or anticlockwise under the action of the speed reducing motor; the gear and the rack are engaged, so that the rotation of the gear is converted into the forward movement or the backward movement of the rack, and the forward movement or the backward movement of the rack can drive the forward movement or the backward movement of the bolt 121 due to the connection of the rack and the bolt 121.

In the embodiment, two ends of the rack are respectively connected to the latch tongue 121 and the blocking piece 122, and are connected by screws, so as to make the locking mechanism 120 more stable by a more stable connection manner.

It should be noted that the motor 131 may also adopt other power sources, and the transmission pair 132 may also adopt other transmission structures, such as a swing link transmission, a gear chain transmission, a worm gear transmission or a lead screw nut transmission, and the technical solution in this embodiment is only to exemplify the transmission pair 132 as a rack and pinion structure, and is not limited herein.

With continuing reference to fig. 1, fig. 2 and fig. 6, further, the mechanical unlocking mechanism 140 includes a rotating shaft 141 and a cam 142, an axis of the rotating shaft 141 is a rotation axis 1423 of the cam 142, the cam 142 can rotate between a first rotation position and a second rotation position under an external force, a distance between the rotation axis 1423 and the latch 121 is smaller than a maximum distance between the rotation axis 1423 and an outer contour of the cam 142, when the cam 142 is located at the first rotation position, the latch 121 is located at the locking position, and when the cam 142 is located at the second rotation position, the latch 121 is located at the unlocking position; in the process that the cam 142 is switched from the first rotating position to the second rotating position, the outer profile of the cam 142 drives the bolt 121 to move to the unlocking position. That is to say, when the cam 142 is located at the first rotation position, the latch bolt 121 is locked, when the rotating shaft 141 drives the cam 142 to rotate, the cam 142 rotates from the first rotation position to the second rotation position, and in the process of switching the cam 142 from the first rotation position to the second rotation position, the cam 142 pushes the latch bolt 121 to retreat, thereby realizing unlocking.

Specifically, the distance between the rotating shaft 141 and the latch bolt 121 may be greater than the minimum distance between the rotation axis 1423 and the outer contour of the cam 142, and at this time, when the rotating shaft 141 drives the cam 142 to rotate, the cam 142 can intermittently contact the latch bolt 121, so that the cam 142 rotates to push the latch bolt 121 to retreat; or, the distance between the rotating shaft 141 and the latch bolt 121 is not greater than the minimum distance between the rotation axis 1423 and the outer contour of the cam 142, at this time, the cam 142 is always abutted against the latch bolt 121, when the rotating shaft 141 drives the cam 142 to rotate, the distance between the latch bolt 121 and the rotation axis 1423 is the distance between the contact position of the cam 141 and the latch bolt 121 and the rotation axis 1423, and when the cam 142 rotates, the distance between the latch bolt 121 and the rotation axis 1423 is constantly changed to push the latch bolt 121 to retreat.

With continued reference to fig. 1 to fig. 5, further, the mechanical unlocking mechanism 140 further includes a limiting member 143, and the limiting member 143 and the mechanical unlocking mechanism 140 are located on the same side of the lock body 110. In the radial direction of the rotating shaft 141, the distance between the limiting element 143 and the rotation axis 1423 is greater than the minimum distance between the rotation axis 1423 and the outer contour of the cam 142, and the distance between the limiting element 143 and the rotation axis 1423 is smaller than the maximum distance between the rotation axis 1423 and the outer contour of the cam 142, that is, the limiting element 143 is located in the range covered by the contour when the cam 142 rotates, in other words, the limiting element 143 is located on the rotation path of the outer contour when the cam 142 rotates, so that the limiting element 143 can be located on one side of the cam 142 to block the rotation of the cam 142.

In this embodiment, the position-limiting member 143 is a position-limiting pin, and one end of the position-limiting pin is fixed on the surface of the lock body 110. In a specific implementation process, the limiting member 143 may also be limited by other components, which are not limited herein.

Referring to fig. 6, further, the outer profile of the cam includes: a cam surface 1421 on a side of the cam 142 near the latch tongue 121, a catch 1422 on a side of the cam 142 far from the latch tongue 121, a guide arc 1424 between the catch 1422 and the cam surface 1421, and a stopper 143 on a side of the cam 142 far from the latch tongue 121. In the process that the cam surface 1421 rotates from the second rotational position to the first rotational position, the guiding arc surface 1424 is in relative sliding fit with the limiting member 143.

Specifically, when the cam 142 rotates, the guiding arc surface 1424 can function to facilitate the limiting member 143 to enter the slot 1422. The cam 142 can rotate between a first rotation position and a second rotation position under the action of an external force, the cam surface 1421 correspondingly rotates between the first rotation position and the second rotation position, when the cam surface 1421 is located at the second rotation position, the cam surface 1421 abuts against the lock tongue 121, at this time, the cam surface 1421 can push the lock tongue 121 in the unlocking direction, when the cam surface 1421 is located at the first rotation position, the slot 1422 abuts against the stopper 143, the stopper 143 is located on a rotation path of the slot 1422 rotating around the rotation axis 1423, and the stopper 143 prevents the cam 142 from continuing to rotate under the action of the elastic member 144.

Referring to fig. 3, the mechanical unlocking mechanism further includes an elastic element 144 disposed between the limiting element 143 and the rotating shaft 141, the elastic element 144 is configured to make the cam surface 1421 have a tendency to move toward the first rotating position, and the elastic element 144 drives the cam 142 to rotate near the limiting element 143, that is, the cam 142 is in a state of abutting against the limiting element 143 without an external force.

In this embodiment, the elastic element 144 is a torsion spring, and the torsion spring can drive the rotating shaft 141 to rotate toward the limiting element 143, so as to achieve the effect of automatic reset.

Referring to fig. 1 to 2, further, two ends of the rotating shaft 141 are rotatably connected to the lock body 110 and the fixing plate 145, respectively, and the fixing plate 145 is detachably connected to the lock body 110.

In this embodiment, a protruding plate is disposed on one side of the lock body 110 where the mechanical unlocking mechanism 140 is disposed, the fixing plate 145 is L-shaped, the fixing plate 145 is connected to the protruding plate of the lock body 110 by a bolt, and a vertical surface of the fixing plate 145 is parallel to a side surface of the lock body 110.

Referring to fig. 3, a shaft clip 146 is further disposed on an end of the rotating shaft 141 near the lock body 110 for fixing the rotating shaft 141 to prevent the rotating shaft 141 from deviating during rotation.

Further, one end of the rotating shaft 141, which is far away from the lock body 110, is connected to an anti-theft screw 147, the anti-theft screw 147 penetrates through the fixing plate 145, and when the mechanical unlocking is required, the anti-theft screw 147 is rotated by using a tool matched with the anti-theft screw 147, and the rotating shaft 141 is driven by the anti-theft screw 147 to rotate, so as to drive the cam 142 to rotate.

The working principle is as follows:

the automatic unlocking process: when the motor 131 receives the unlocking signal, the motor 131 drives the driving part 1321 of the transmission pair 132 to rotate, the driving part 1321 drives the driven part 1322 matched with the driving part 1321, the driven part 1322 is connected with the bolt 121, the bolt 121 moves rightwards under the guiding action of the guiding part 123, so that the blocking piece 122 is driven to move rightwards, after the blocking piece 122 moves to a proper position to trigger the sensor, the sensor feeds back and transmits a position signal of the blocking piece 122 to the motor 131, the motor 131 is closed, and the unlocking is completed.

And (3) automatic locking process: when the motor 131 receives the lock closing signal, the motor 131 drives the driving part 1321 of the transmission pair 132 to rotate in the reverse direction, the driving part 1321 drives the driven part 1322 matched with the driving part 1321, the driven part 1322 is connected with the bolt 121, the bolt 121 moves leftwards under the guiding action of the guiding part 123, so that the blocking piece 122 is driven to move leftwards, the sensor feeds back and transmits a position signal of the blocking piece 122 to the motor 131 after the blocking piece 122 moves to a proper position to trigger the sensor, the motor 131 is closed, and the lock closing is completed.

And (3) mechanical unlocking process: when the automatic unlocking mechanism 130 fails, a mechanical key can be pressed against the antitheft screw 147 to rotate clockwise, the antitheft screw 147 drives the rotating shaft 141 and the cam 142 to rotate, and the cam 142 pushes the lock tongue 121 to move to the right side to unlock. When the unlocking is completed and the mechanical key is removed, the cam 142 is restored to the abutting position against the stopper 143 by the elastic force of the elastic member 144.

The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly 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 the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

Claims

1. An automatic lock, characterized in that it comprises:

a lock body which is provided with a lock hole,

2. The automatic lock of claim 1, wherein the locking mechanism further comprises a catch coupled to the locking bolt through the lock body.

3. The automatic lock of claim 2, wherein the locking mechanism further comprises a guide member disposed between the locking bolt and the catch, the guide member sliding through the lock body.

4. The automatic lock of claim 1, wherein the automatic unlocking mechanism comprises a motor and a transmission pair, the transmission pair comprises a driving member and a driven member, the driving member is connected with the motor, and the driven member is connected with the bolt.

5. The automatic lock of claim 1, wherein the mechanical unlocking mechanism comprises a rotating shaft and a cam, the axis of the rotating shaft is a rotation axis of the cam, the cam can rotate between a first rotation position and a second rotation position under the action of external force, the distance between the rotation axis and the lock tongue is smaller than the maximum distance between the rotation axis and the outer contour of the cam, the lock tongue is in a locking position when the cam is in the first rotation position, and the lock tongue is in an unlocking position when the cam is in the second rotation position; in the process that the cam is switched to the second rotating position from the first rotating position, the outer contour of the cam drives the lock tongue to move to the unlocking position.

6. The automatic lock of claim 5, wherein the mechanical unlocking mechanism further comprises a limiting member, the limiting member and the mechanical unlocking mechanism are located on the same side of the lock body, the distance between the limiting member and the rotation axis is greater than the minimum distance between the rotation axis and the cam outer contour, the distance between the limiting member and the rotation axis is less than the maximum distance between the rotation axis and the cam outer contour, and the limiting member is located within the range covered by the cam outer contour when the cam rotates.

7. The automatic lock of claim 6, wherein the cam outer contour comprises a cam surface on a side of the cam near the lock tongue, a slot provided on a side of the cam far from the lock tongue, and a guiding arc surface between the slot and the cam surface, the stopper is provided on a side of the cam far from the lock tongue, and when the cam surface is located at the first rotational position, the slot abuts against the stopper.

8. The automatic lock of claim 7, wherein the guiding arc surface is in sliding engagement with the retainer during rotation of the cam surface from the second rotational position to the first rotational position.

9. The automatic lock of claim 7, further comprising a resilient member disposed between the retainer and the pivot shaft, the resilient member configured to urge the cam surface toward a first rotational position.

10. The automatic lock of claim 5, wherein the two ends of the shaft are rotatably connected to the lock body and a fixing plate, respectively, and the fixing plate is detachably connected to the lock body.