Lock

Abstract

The lock comprises a lock main body and a key which are matched with each other, the lock main body comprises a main body part, a rotating part, at least one group of clamping parts, a spring bolt and a transmission part, one end of the main body part is provided with a containing groove, and the main body part is further provided with a first sliding groove communicated with the containing groove; the rotating part is located in the containing groove and rotationally connected with the main body part, the rotating part has the degree of freedom of rotating around the depth direction of the containing groove, a lock hole is formed in the end, close to a groove opening of the containing groove, of the rotating part, and a key is inserted into the lock hole; the at least one group of clamping parts are arranged in the circumferential direction of the rotating part and penetrate through the rotating part, one end of each clamping part is connected with the main body part, and the key is matched with the clamping parts to release the rotational degree of freedom of the rotating part; the spring bolt penetrates through a groove opening of the first sliding groove and is in sliding fit with the main body part. The transmission part is connected with the rotating part and the spring bolt and responds to the driving force of the rotating part to drive the spring bolt to retract into the first sliding groove. The key can be effectively prevented from being broken.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of lock, in particular to a lock. BACKGROUND

[0002] The lock is a metal device added to the opening or connecting part of doors, windows and other objects, which can be opened only by using a key, password, magnetic card, etc. The lock is an indispensable product in people's daily life and is one of the tools that can provide security for people's property.

[0003] In the use of the traditional lock using a key to open, the key and the lock hole are in an elongated shape, and the opening of the lock hole is small and easy to block, which makes it difficult to insert the key into the lock hole and unable to normally open the lock. Meanwhile, the elongated key is easy to break, and the use is relatively inconvenient. CONTENT OF THE INVENTION

[0004] The main purpose of the present application is to provide a lock, which aims to solve the problem of inconvenient use of the traditional lock.

[0005] To achieve the above-mentioned purpose, the present application provides a lock, which comprises a lock body and a key matched with each other. The lock body comprises a main body part, a rotating part, at least one set of clamping parts, a lock tongue and a transmission part. The main body part has a receiving groove at one end, and a first sliding groove in communication with the receiving groove is further arranged on the main body part. The rotating part is located in the receiving groove and is rotationally connected with the main body part. The rotating part has the freedom of rotation around the depth direction of the receiving groove. The rotating part is provided with a lock hole at one end close to the groove opening of the receiving groove, and the lock hole is used for inserting the key. The at least one set of clamping parts are arranged in the circumferential direction of the rotating part. The clamping parts penetrate the rotating part and are connected with the main body part at one end. The key cooperates with the clamping parts to release the rotational freedom of the rotating part. The lock tongue is arranged at the groove opening of the first sliding groove and is in sliding cooperation with the main body part. The transmission part connects the rotating part and the lock tongue. The transmission part drives the lock tongue to retract into the first sliding groove in response to the driving force of the rotating part.

[0006] Optionally, the clamping parts are four sets, and the four sets of clamping parts are uniformly and spacedly distributed on the outer periphery of the rotating part.

[0007] Optionally, the rotating part is provided with a communication hole corresponding to each clamping part. The side wall of the receiving groove is provided with a limiting groove corresponding to each clamping part. The clamping part comprises a limiting column, a first spring and a moving column. The limiting column is located in the corresponding limiting groove and the corresponding communication hole at both ends. The first spring is arranged in the limiting groove and connects the limiting column with the main body part. One end of the moving column is located in the communication hole, and the other end is located in the lock hole. The moving column is in sliding cooperation with the rotating part. The key cooperates with the moving column to push the limiting column to retract into the corresponding limiting groove to release the rotational freedom of the rotating part.

[0008] Optionally, an annular groove is arranged on the inner periphery of the communication hole. The clamping part further comprises a limiting ring, which is sleeved on the outer periphery of the moving column and located in the annular groove.

[0009] Optionally, the key comprises a column and a handle, the column is provided with a plurality of resistance grooves corresponding to the plurality of moving columns, and when the column is inserted into the lock hole, the end of the moving column away from the limiting column is in resistance with the corresponding resistance groove, and the limiting column is retracted into the corresponding limiting groove; the handle is fixed to one end of the column and located outside the main body; wherein the end of the resistance groove away from the handle is open.

[0010] Optionally, the width of the resistance groove is the same as the diameter of the moving column.

[0011] Optionally, the resistance groove has a resistance slope, the resistance slope is in resistance with the end of the moving column away from the limiting column, the distance between the end of the resistance slope close to the handle and the axis of the column is a, the distance between the end of the resistance slope away from the handle and the axis of the column is b, and a < b.

[0012] Optionally, when the side of the limiting ring away from the limiting column is in resistance with the annular groove, the minimum distance between the moving column and the side wall of the lock hole is c, the radius of the column is d, and d-b > c.

[0013] Optionally, the inner periphery of the lock hole is further provided with a second sliding groove; the lock further comprises a sliding bar, the sliding bar is fixed to the outer periphery of the column and the extension direction is the same as the axial direction of the column; wherein when the column is inserted into the lock hole, the sliding bar is in sliding cooperation with the second sliding groove.

[0014] Optionally, the extension direction of the first sliding groove is the same as the depth direction of the accommodating groove; the lock further comprises a second spring, a positioning pin and a spiral baffle, the second spring is arranged in the first sliding groove and connected with the main body and the lock tongue; the positioning pin is fixed to the side of the lock tongue facing the rotating part; the spiral baffle is fixed to the side of the rotating part facing the positioning pin, the inner periphery of the spiral baffle is in resistance with the positioning pin, and the two ends of the spiral baffle are both provided with a limiting baffle.

[0015] The lock provided by the embodiment of the present application, the key is inserted into the lock hole along the depth direction of the accommodating groove, at this time the key is in cooperation with the clamping part to release the rotation freedom of the rotating part, the key is rotated to drive the rotating part to rotate, the rotating part drives the lock tongue to retract into the first sliding groove through the transmission part, so that the unlocking of the lock is completed, and the clamping part is arranged in the circumferential direction of the rotating part, so that the length of the part of the key inserted into the lock hole in the depth direction of the accommodating groove is greatly reduced compared with the traditional scheme, thereby effectively preventing the key from being broken; at the same time, the arrangement of the clamping part in the circumferential direction of the rotating part increases the lock hole, thereby effectively preventing the lock hole from being blocked. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 The overall structure schematic diagram of the lock provided by the embodiment of the present application;

[0017] Figure 2 The overall structure schematic diagram of the lock provided by the embodiment of the present application; Figure 1Structure schematic view of the key pulling out the lock hole in the embodiment of the present application;

[0018] Figure 3 Structure schematic view of the main body part in the embodiment of the present application;

[0019] Figure 4 Structure schematic view of the lock tongue in the embodiment of the present application; Figure 3 Structure enlarged view of A in the embodiment of the present application;

[0020] Figure 5 Structure schematic view of the spiral baffle in the embodiment of the present application.

[0021] Figure 6 Structure schematic view of the spiral baffle in the embodiment of the present application.

[0022] In the figure: 1, main body part; 11, containing groove; 12, first sliding groove; 13, limiting groove; 2, rotating part; 21, lock hole; 22, communicating hole; 221, annular groove; 23, second sliding groove; 24, sliding bar; 3, lock tongue; 41, limiting column; 42, first spring; 43, moving column; 44, limiting ring; 51, column body; 511, abutting groove; 52, handle; 6, second spring; 7, positioning pin; 8, spiral baffle; 81, limiting baffle.

[0023] The implementation, functional features and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application.

[0025] It should be noted that all the directionality indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present application are only used to explain the relative position relationship, movement condition, etc. between the components in a certain specific posture (as shown in the drawings). If the specific posture changes, the directionality indications also change accordingly.

[0026] In this utility model, unless otherwise explicitly specified and limited, the terms "connection," "fixing," etc., should be interpreted broadly. For example, "fixing" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0027] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0028] refer to Figures 1-6 It should be understood that, Figure 2 The connections between the various components should be like Figure 1 As compact as in the middle, this is only for illustrative purposes and will Figure 2 For ease of understanding, some components are shown disassembled. This application provides a lock, which may include a lock body and a key that cooperate with each other. The lock body may include a main body 1, a rotating part 2, at least one set of locking parts, a bolt 3, and a transmission part. One end of the main body 1 has a receiving groove 11, and the main body 1 is also provided with a first sliding groove 12 communicating with the receiving groove 11. The rotating part 2 is located in the receiving groove 11 and is rotatably connected to the main body 1. The rotating part 2 has the ability to rotate about the depth direction of the receiving groove 11. The rotating part 2 has a lock hole 21 at one end near the opening of the receiving groove 11, for inserting a key; at least one set of latching parts are arranged in the circumferential direction of the rotating part 2, the latching parts pass through the rotating part 2 and one end is connected to the main body 1, and the key cooperates with the latching parts to release the rotational freedom of the rotating part 2; the latch 3 passes through the opening of the first sliding groove 12 and slides with the main body 1; the transmission part connects the rotating part 2 and the latch 3, and the transmission part responds to the driving force of the rotating part 2 to drive the latch 3 to retract into the first sliding groove 12.

[0029] The lock provided by the embodiment of the present application is inserted into the lock hole 21 along the depth direction of the accommodating groove 11, at this time, the key cooperates with the clamping part to release the rotation freedom of the rotating part 2, the key is rotated to drive the rotating part 2 to rotate, the rotating part 2 drives the lock tongue 3 to retract into the first sliding groove 12 through the transmission part, and the unlocking of the lock is completed. The clamping part is arranged in the circumferential direction of the rotating part 2, so that the length of the part of the key inserted into the lock hole 21 in the depth direction of the accommodating groove 11 is greatly reduced compared with the traditional scheme, and the key is effectively prevented from being broken. At the same time, the clamping part is arranged in the circumferential direction of the rotating part 2, so that the lock hole 21 is increased, and the lock hole 21 is effectively prevented from being blocked.

[0030] Specifically, the depth direction of the accommodating groove 11 can be recorded as the first direction, the main body part 1 can be cylindrical, and the first direction is the same as the axial direction of the main body part 1. At the same time, the depth direction of the lock hole 21 is also the same as the axial direction of the main body part 1.

[0031] When the key is inserted into the lock hole 21 along the first direction, the key cooperates with the clamping part, so that the rotating part 2 can rotate around the first direction. By rotating the key, the rotating part 2 can be driven to rotate around the first direction. The rotating part 2 further drives the lock tongue 3 to retract into the first sliding groove 12 through the transmission part, so as to unlock the lock. When locking, the key is reversed to drive the rotating part 2 to rotate around the first direction. The rotating part 2 further drives the lock tongue 3 to partially extend out of the first sliding groove 12 through the transmission part, so as to lock the lock.

[0032] It should be understood that the locking and unlocking of the lock here refers to the extension or retraction of the lock tongue 3 out of the first sliding groove 12. The specific cooperation of the lock tongue 3 with the remaining structure to realize the locking or unlocking between two objects is more in the traditional scheme, which will not be described in detail here.

[0033] In addition, the clamping part is arranged in the circumferential direction of the rotating part 2, so that the key cooperates with the corresponding clamping part in the circumferential direction. Therefore, the circumferential dimension of the key is necessarily increased compared with the traditional scheme, so that the lock hole 21 is increased, and the lock hole 21 is effectively prevented from being blocked.

[0034] The rotating key drives the rotating part 2 to rotate, which can be realized by shape cooperation. For example, the part of the key inserted into the lock hole 21 can be quadrangular prism, and the lock hole 21 cooperates with the key. Therefore, the key rotating around the first direction can drive the rotating part 2 to rotate.

[0035] Reference Figures 2-3 In the exemplary embodiment, the clamping part has four groups, and the four groups of clamping parts are uniformly and separately distributed on the outer periphery of the rotating part 2.

[0036] It should be understood that the more the number of clamping parts, the more complex the lock is, that is, the higher the security of the lock is, and the more complex the manufacturing is. In the preferred embodiment, the clamping part has four groups, so that the lock is relatively easy to manufacture and has relatively high security.

[0037] With reference to Figures 3-4 In the example embodiment, the rotating part 2 is provided with a communication hole 22 corresponding to each clamping part; the side wall of the accommodating groove 11 is provided with a limiting groove 13 corresponding to each clamping part; the clamping part can include a limiting column 41, a first spring 42 and a moving column 43, the two ends of the limiting column 41 are respectively located in the corresponding limiting groove 13 and the corresponding communication hole 22; the first spring 42 is arranged in the limiting groove 13 and connects the limiting column 41 and the main body part 1; one end of the moving column 43 is located in the communication hole 22 and the other end is located in the lock hole 21, the moving column 43 is in sliding fit with the rotating part 2; wherein the key cooperates with the moving column 43 to push the limiting column 41 to retract into the corresponding limiting groove 13 to release the rotating freedom of the rotating part 2.

[0038] Specifically, after the key is inserted into the lock hole 21 along the first direction, the key cooperates with the moving column 43 and pushes the limiting column 41 through the moving column 43, so that the limiting column 41 retracts into the corresponding limiting groove 13, and the moving column 43 does not enter the limiting groove 13, so that the rotating freedom of the rotating part 2 is released.

[0039] With reference to Figures 3-4 In the example embodiment, an annular groove 221 is arranged on the inner periphery of the communication hole 22; the clamping part can further include a limiting ring 44, the limiting ring 44 is sleeved on the outer periphery of the moving column 43 and located in the annular groove 221.

[0040] Specifically, when the key is not inserted into the lock hole 21, the first spring 42 pushes the limiting column 41 and the corresponding moving column 43, thereby driving the limiting ring 44 to move until the side of the limiting ring 44 away from the limiting column 41 abuts against one end of the annular groove 221, so that through the cooperation of the limiting ring 44 and the annular groove 221, the first spring 42 can be prevented from pressing the moving column 43 out of the communication hole 22, thereby affecting the normal use of the lock.

[0041] With reference to Figures 2-4 In the example embodiment, the key can include a column body 51 and a handle 52, the outer periphery of the column body 51 is provided with a abutting groove 511 corresponding to each moving column 43, and when the column body 51 is arranged in the lock hole 21, the end of the moving column 43 away from the limiting column 41 abuts against the corresponding abutting groove 511, and the limiting column 41 retracts into the corresponding limiting groove 13; the handle 52 is fixed to one end of the column body 51 and located outside the main body part 1; wherein the end of the abutting groove 511 away from the handle 52 is open.

[0042] Specifically, in the process of inserting the column body 51 into the lock hole 21, the corresponding moving column 43 enters the abutting groove 511 from the end of the abutting groove 511 away from the handle 52, and when the column body 51 is inserted into the lock hole 21, the end of the moving column 43 away from the corresponding limiting column 41 abuts against the abutting groove 511 and is pushed by the abutting groove 511, thereby further releasing the rotating freedom of the rotating part 2.

[0043] In the example embodiment, the width of the interference groove 511 is the same as the diameter of the moving column 43, so the outer periphery of the moving column 43 interferes with the side wall of the interference groove 511; when the moving column 43 enters the corresponding interference groove 511, rotating the handle 52 around the first direction can push the moving column 43 to rotate synchronously through the side wall of the interference groove 511, and the moving column 43 further drives the rotating part 2 to rotate around the first direction.

[0044] Reference Figure 3 In the example embodiment, the interference groove 511 has an interference slope, which interferes with the end of the moving column 43 away from the limiting column 41, the distance between the end of the interference slope close to the handle 52 and the axis of the column 51 is a, and the distance between the end of the interference slope away from the handle 52 and the axis of the column 51 is b, and a < b.

[0045] As Figure 3 shown, when a < b, in the first direction, the depth of the interference groove 511 gradually decreases in the direction close to the handle 52, so when the column 51 is inserted into the lock hole 21, the interference slope will gradually push the moving column 43 close to and push the limiting column 41, so as to retract the limiting column 41 in the limiting groove 13, and further release the rotation freedom of the rotating part 2.

[0046] As Figure 3 shown, in the example embodiment, when the side of the limiting ring 44 away from the limiting column 41 interferes with the annular groove 221, the minimum distance between the moving column 43 and the side wall of the lock hole 21 is c, the radius of the column 51 is d, and d - b > c.

[0047] Specifically, c is the length of the moving column 43 extending into the lock hole 21 when the key is not inserted into the lock hole 21, and d - b is the depth of the end of the interference groove 511 away from the handle 52, when d - b > c, it is ensured that the corresponding moving column 43 can enter the interference groove 511 through the end of the interference groove 511 away from the handle 52.

[0048] Reference Figure 2 In the example embodiment, the inner periphery of the lock hole 21 is also provided with a second sliding groove 23; the lock can also include a sliding bar 24, which is fixed to the outer periphery of the column 51 and the extension direction is the same as the axial direction of the column 51; wherein when the column 51 is inserted into the lock hole 21, the sliding bar 24 and the second sliding groove 23 are in sliding cooperation.

[0049] As Figure 2 shown, when inserting the column 51, it only needs to align the second sliding groove 23 and the sliding bar 24, when the sliding bar 24 is inserted into the second sliding groove 23, the corresponding moving column 43 also enters the corresponding interference groove 511, so that the insertion of the column 51 is more convenient.

[0050] ReferenceFigure 5 and Figure 6 In an exemplary embodiment, the extension direction of the first slide groove 12 is the same as the depth direction of the receiving groove 11; the lock may also include a second spring 6, a positioning pin 7 and a spiral baffle 8. The second spring 6 is disposed in the first slide groove 12 and connects the main body 1 and the latch 3; the positioning pin 7 is fixed to the side of the latch 3 facing the rotating part 2; the spiral baffle 8 is fixed to the side of the rotating part 2 facing the positioning pin 7, the inner circumference of the spiral baffle 8 abuts against the positioning pin 7, and both ends of the spiral baffle 8 are provided with limit baffles 81.

[0051] Specifically, such as Figure 6 As shown, limit baffles 81 are also provided at both ends of the spiral baffle 8. The limit baffles 81 are semi-circular and limit the positioning pin 7 to prevent the positioning pin 7 from disengaging from both ends of the spiral baffle 8.

[0052] It should be understood that when unlocking, the key is inserted into the keyhole 21. At this time, the rotational freedom of the rotating part 2 is released. The key is rotated in the forward direction, which drives the rotating part 2 to rotate. The rotating part 2 further drives the spiral baffle 8 to rotate in the forward direction. The spiral baffle 8 pushes the positioning pin 7 to move, thereby driving the lock tongue 3 to retract into the first slide groove 12.

[0053] When locked, the key is removed, and the second spring 6 pushes the bolt 3 out of the first groove 12. At this time, the positioning pin 7 moves synchronously with the bolt 3, and the positioning pin 7 further pushes the spiral baffle 8, causing the spiral baffle 8 to drive the rotating part 2 to rotate in the opposite direction; when the positioning pin 7 abuts against a limiting baffle 81, as... Figure 6 As shown, at this time, the positioning pin 7 cannot push the spiral baffle 8, the rotating part 2 stops rotating, and the locking tongue 3 stops extending out of the first slide groove 12, thus completing the locking.

[0054] The above are merely preferred embodiments of this application and do not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A lock, characterized in that The lock includes a lock body and a key which cooperate with each other, the lock body comprises: a body part (1) having a receiving groove (11) at one end, the body part (1) is further provided with a first sliding groove (12) which communicates with the receiving groove (11); a rotating part (2) which is located in the receiving groove (11) and is rotationally connected with the body part (1), the rotating part (2) has a freedom of rotation around the depth direction of the receiving groove (11), the rotating part (2) is provided with a lock hole (21) at one end close to the slot opening of the receiving groove (11), the lock hole (21) is for the key to be inserted into; at least one set of clamping parts which are arranged in the circumferential direction of the rotating part (2), the clamping parts penetrate the rotating part (2) and one end of the clamping parts is connected with the body part (1), the key cooperates with the clamping parts to release the rotating freedom of the rotating part (2); a lock tongue (3) which is arranged at the slot opening of the first sliding groove (12) and is slidingly connected with the body part (1); a transmission part which connects the rotating part (2) and the lock tongue (3), the transmission part drives the lock tongue (3) to retract into the first sliding groove (12) in response to the driving force of the rotating part (2).

2. The lock of claim 1, wherein The clamping parts are four sets, and the four sets of clamping parts are uniformly distributed on the outer periphery of the rotating part (2).

3. The lock of claim 1, wherein The rotating part (2) is provided with a communication hole (22) corresponding to each clamping part; The side wall of the receiving groove (11) is provided with a limiting groove (13) corresponding to each clamping part; The clamping part comprises: a limiting column (41) which is located in the limiting groove (13) and the communication hole (22) corresponding to each clamping part; a first spring (42) which is arranged in the limiting groove (13) and connects the limiting column (41) and the body part (1); a moving column (43) which is located in the communication hole (22) at one end and is located in the lock hole (21) at the other end, the moving column (43) is slidingly connected with the rotating part (2); The key cooperates with the moving column (43) to push the limiting column (41) to retract into the limiting groove (13) corresponding to each clamping part to release the rotating freedom of the rotating part (2).

4. The lock of claim 3, wherein The inner periphery of the communication hole (22) is provided with an annular groove (221), and the clamping part further comprises: a limiting ring (44) which is sleeved on the outer periphery of the moving column (43) and is located in the annular groove (221).

5. The lock of claim 4, wherein The key comprises: a column body (51) which is provided with a resisting groove (511) corresponding to each moving column (43) on the outer periphery, and when the column body (51) is arranged in the lock hole (21), the end of the moving column (43) away from the limiting column (41) is in contact with the resisting groove (511) corresponding to each clamping part, and the limiting column (41) retracts into the limiting groove (13) corresponding to each clamping part; a handle (52) which is fixed to one end of the column body (51) and is located outside the body part (1); The end of the resisting groove (511) away from the handle (52) is open.

6. The lock of claim 5, wherein The width of the resisting groove (511) is the same as the diameter of the moving column (43).

7. The lock of claim 5, wherein The abutting groove (511) has an abutting slope which abuts with an end of the moving column (43) away from the limiting column (41), the distance between the abutting slope near an end of the handle (52) and the axis of the column body (51) is a, the distance between the abutting slope away from the handle (52) and the axis of the column body (51) is b, and a < b.

8. The lock of claim 7, wherein, When the limiting ring (44) abuts with the annular groove (221) on the side away from the limiting column (41), the minimum distance between the moving column (43) and the sidewall of the lock hole (21) is c, the radius of the column body (51) is d, and d-b > c.

9. The lock of claim 5, wherein, The inner periphery of the lock hole (21) is further provided with a second sliding groove (23); The lock further comprises: A sliding strip (24) is fixed to the outer periphery of the column body (51) and extends in the same direction as the axial direction of the column body (51); When the column body (51) is inserted into the lock hole (21), the sliding strip (24) is in sliding cooperation with the second sliding groove (23).

10. The lock of claim 1, wherein The extending direction of the first sliding groove (12) is the same as the depth direction of the accommodating groove (11); the transmission part comprises: A second spring (6) is arranged in the first sliding groove (12) and connects the main body (1) and the lock tongue (3); A positioning pin (7) is fixed to the side of the lock tongue (3) facing the rotating part (2); A spiral baffle (8) is fixed to the side of the rotating part (2) facing the positioning pin (7), the inner periphery of the spiral baffle (8) abuts with the positioning pin (7), and both ends of the spiral baffle (8) are provided with a limiting baffle (81).

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