CN210033008U - Window lock and window based on window lock - Google Patents

Abstract

The utility model relates to a window lock reaches window based on window lock, wherein the window lock is including latch hook and locking lever, and latch hook and locking lever can set up respectively on the frame of window and window, and the latch hook has spacing portion. When the window is closed, the lock rod can push the limiting part to leave the initial position, and after the lock rod passes through the initial position, the limiting part returns to lock the lock rod under the action of driving force. When the lock is unlocked, the handle can be rotated, and the lock rod is separated from the limiting part through the connecting rod mechanism. The structure is simple and easy to expand to multipoint locking.

Description

Window lock and window based on window lock

Technical Field

The utility model relates to a window lock. The utility model discloses still relate to a window based on window lock.

Background

When the window is closed, in order to prevent other factors such as wind force from being opened again, a window lock is required to be added to firmly lock the window.

In particular fields, the design of window locks is of particular importance, such as fire windows.

A fire window is a window that, in conjunction with a frame, meets the requirements of fire stability and fire integrity over a period of time. When needed, the fire window is closed to prevent the spread of fire over the fire window. In a high-temperature environment of a fire, because the fire window is required to be prevented from being opened again or generating a large gap due to factors such as deformation and wind power, a fire lock is required to be additionally arranged on the fire window to lock the fire window.

A conventional fire-proof lock is a bolt-type fire-proof lock, as shown in fig. 1, a bolt 1 'is telescopically arranged in an opening side edge of a window 2', a frame 4 'of the window is correspondingly provided with a lock hole 3', when the window is closed, the frame 4 'side edge acts on an inclined surface of the bolt 1' to enable the bolt 1 'to retract into the window 2', and the bolt 1 'rebounds to be locked into the lock hole 3' to complete locking when the window is closed. However, this type of deadbolt fire-resistant latch has disadvantages: the lock tongue has a complex structure and large overall volume, so that the window manufacturing process is complex; in addition, often only single-point locking for at high temperature in conflagration the window is yielding, thereby the deformation of window has reduced the leakproofness of window and has reduced fire prevention ability, even increase the locking point, for example increase a pair spring bolt again, at this moment need untie the spring bolt one by one again when windowing, makes the unblock window-opening become loaded down with trivial details.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a window lock, the structure is brief and expand into the multiple spot locking easily.

In order to achieve the above purpose, the utility model adopts the technical scheme that:

the utility model provides a window lock, it includes:

the locking hook is provided with a limiting part, and the locking hook is acted by driving force to enable the limiting part to be maintained at an initial position;

the lock rod is arranged on one of the frame of the window and the window, and the other lock rod is correspondingly arranged on the other frame of the window and the window;

the lock hook at least has a first state and a second state, when the lock hook is in the first state, the limiting part is in a position far away from the initial position to allow the lock rod to pass through the initial position to enter a locking position, and when the lock hook is in the second state, the limiting part is in the initial position and limits the lock rod in the locking position to lock the lock rod;

the unlocking assembly comprises a connecting rod mechanism and a rotatable handle, the connecting rod mechanism can reciprocate in the linear direction, a transmission part is arranged in the connecting rod mechanism, a shifting rod capable of shifting the transmission part to shift the connecting rod mechanism is arranged in the handle, one of the lock hook and the lock rod is arranged in the connecting rod mechanism, and when the connecting rod mechanism moves, the lock rod can be separated from the limiting part to release locking.

Optimally, the driving force is solely formed by the weight of the latch hook.

Preferably, the driving force includes an elastic force formed by an elastic member acting on the latch hook.

Further, the elastic member includes a torsion spring or a straight spring.

Preferably, the locking hook is rotatably or movably arranged.

Further, the locking device further comprises a positioning piece which is arranged in the motion path of the locking hook so as to accurately enable the limiting part to stay at the initial position.

Preferably, the locking hook and the corresponding locking rod are respectively provided with one or more than one.

Preferably, the link mechanism includes a link, the transmission member is provided in the link, one of the lock hook and the lock lever is also provided in the link, and the link is formed of one or more sections of struts connected to each other.

Preferably, the linkage is slidably arranged in an edge profile of the window or frame of the window.

Because of the application of the technical scheme, compared with the prior art, the utility model has the following advantages:

the utility model discloses a window lock, owing to the spacing portion on the locking lever promotion latch hook when closing the window, make spacing portion leave initial position, thereby waiting for spacing portion when the locking lever passes initial position to lock the locking lever because the effect return of drive force, at this moment the window can not be opened owing to being locked by the window lock, even under the special circumstances, for example under conflagration high temperature environment, the window is also difficult to be opened because of warping or wind-force, has guaranteed sealing performance. The window lock structure is simple. In addition, the lock hooks and the corresponding lock rods can be respectively arranged to be multiple (for example, more than one), at this time, one of the lock hooks or the lock rods is arranged on the link mechanism, and at this time, all the lock hooks and the lock rods can be unlocked through one-time movement of the link mechanism, so that the multipoint locking is easily expanded, and the complexity of unlocking is not basically increased during multipoint locking.

Another object of the present invention is to provide a window based on window lock, which adopts a window lock with simple structure and easy expansion to multi-point locking.

In order to achieve the above purpose, the utility model adopts the technical scheme that:

the utility model provides a window based on window lock, it includes the frame of window, sets up the window with window closer between the frame and distribute in the window with the window lock of frame, the window lock includes:

the locking hook is provided with a limiting part, and the locking hook is acted by driving force to enable the limiting part to be maintained at an initial position;

the lock rod is arranged on one of the frame of the window and the window, and the other lock rod is correspondingly arranged on the other frame of the window and the window;

the lock hook at least has a first state and a second state, when the lock hook is in the first state, the limiting part is in a position far away from the initial position to allow the lock rod to pass through the initial position to enter a locking position, and when the lock hook is in the second state, the limiting part is in the initial position and limits the lock rod in the locking position to lock the lock rod;

the unlocking assembly comprises a connecting rod mechanism and a rotatable handle, the connecting rod mechanism can reciprocate in the linear direction, a transmission part is arranged in the connecting rod mechanism, a shifting rod capable of shifting the transmission part to shift the connecting rod mechanism is arranged in the handle, one of the lock hook and the lock rod is arranged in the connecting rod mechanism, and when the connecting rod mechanism moves, the lock rod can be separated from the limiting part to release locking.

Because of the application of the technical scheme, compared with the prior art, the utility model has the following advantages:

the utility model discloses a window based on window lock has adopted a window lock, because the locking lever promotes the spacing portion on the latch hook when closing the window, makes spacing portion leave initial position, thereby waits for the locking lever to pass spacing portion behind the initial position because the effect return of drive power locks the locking lever, at this moment the window is because being locked by the window and be difficult to opened, even under special circumstances such as conflagration high temperature environment, the window is also difficult to be opened because of being out of shape or wind-force, has guaranteed sealing performance. The window lock structure is simple. In addition, the lock hooks and the corresponding lock rods can be respectively arranged in a plurality of numbers (for example, more than two), at this time, one of the lock hooks or the lock rods is arranged on the link mechanism, and at this time, all the lock hooks and the lock rods can be unlocked through one-time movement of the link mechanism, so that the multipoint locking is easily expanded, and the complexity of unlocking is not basically increased during multipoint locking.

Drawings

Some specific embodiments of the present invention will be described in detail hereinafter, by way of illustration and not by way of limitation, with reference to the accompanying drawings. The same reference numbers in the drawings identify the same or similar elements or components. Those skilled in the art will appreciate that the drawings are not necessarily drawn to scale. In the drawings:

FIG. 1 is a schematic view of a prior art fire window construction employing a fire-resistant lock;

FIG. 2 is a schematic view of a preferred embodiment fire window of the window based on the window lock of the present invention;

FIG. 3 is a cross-sectional view of a fire protection window;

FIG. 4 is a schematic view of the locking process of the fire-resistant lock in the fire-resistant window of FIG. 2 when the window is closed;

FIG. 5 is an enlarged schematic view at A in FIG. 4 (with the moving parts shown in phantom);

FIG. 6 is a schematic view of the manual unlocking process of the fireproof lock;

FIG. 7 is a schematic view of an unlocking assembly in the fire-resistant lock;

FIG. 8 is a schematic view of the construction of a latch hook and its vicinity in another embodiment, wherein the latch hook is purely gravity driven;

fig. 9 is a schematic structural diagram of a latch hook and its nearby components in yet another embodiment, wherein the latch hook is movably disposed;

FIG. 10 is a schematic view of a latch hook and its vicinity in yet another alternative, wherein the latch hook is primarily actuated by a straight spring;

FIG. 11 is a schematic view of the action of the card when the linkage is assembled;

FIG. 12 is a schematic structural view (sectional view) of a link mechanism slidably disposed in a profile;

wherein the reference numerals are as follows:

1. a latch hook; 11. a limiting part;

2. a lock lever;

3. an unlocking assembly; 31. a link mechanism; 311. a transmission member; 312. a connecting rod; 3121. a strut; 313. a card; 32. a handle; 321. a deflector rod;

4. a window; 41. a section bar;

5. a frame;

6. an elastic member;

7. a positioning member;

8. a window closer;

9. a chute.

Detailed Description

The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

Furthermore, the technical features mentioned in the different embodiments of the invention described below can be combined with each other as long as they do not conflict with each other.

As shown in fig. 2, the present embodiment shows a window based on a window lock: a fire window. A window lock, i.e. a fire lock, as shown in fig. 4 is used. The fire locks are distributed in the window 4 and the frame 5 of the window.

The fire window further adopts a window closer 8, the window closer 8 has a temperature sensing function, the window 4 can be driven to close due to the detection of high temperature in the case of fire, and the window closer 8 can adopt a window closer for fire window disclosed in the Chinese patent with publication number "CN 109098579A".

In addition, since the window 4 is opened again or a large gap is formed between the window 4 and the frame 5 due to burning deformation or wind force in a high temperature environment of a fire after the window closer 8 closes the window 4, thereby reducing fire resistance, a fire-proof lock is required to be provided to more firmly lock the window 4 and the frame 5 after the window 4 is closed.

In this embodiment, the fire locks are mainly distributed in the profiles 41 of the window 4 and the frame 5, in particular in the opening side profile 41 of the window 4 and in the corresponding frame 5 side profile (see fig. 3). Of course, the fire-resistant lock can also be arranged on the side other than the side on which the axis of rotation of the window 4 is located and on the side of the frame 5 corresponding to this side of the window.

As shown in fig. 4, see a, the locking hook 1 is disposed on the frame 5 (see fig. 2 and 3), the locking hook 1 is rotatably disposed, the rotating shaft of the locking hook 1 is installed in the frame 5, and the movable end of the locking hook 1 is provided with a limiting portion 11. On the upper side of the locking hook 1, also in the path of movement of the locking hook 1, a positioning element 7 is provided, the positioning element 7 limiting the maximum position of the clockwise upward rotation of the locking hook 1, the stop 11 staying in the initial position when the locking hook 1 abuts against the positioning element 7.

An elastic element 6, i.e. a torsion spring, is inserted into the rotational axis of the locking hook 1, and the torsion spring exerts an elastic force on the locking hook 1, which overcomes the weight of the locking hook 1 and presses the locking hook 1 against the positioning element 7. It can also be said that the latch hook 1 is acted upon by the driving force including the elastic force of the torsion spring to the latch hook 1 and the gravity of the latch hook 1 to maintain the stopper portion 11 at the initial position, and the driving force urges the latch hook 1 against the positioning member 7 to maintain the stopper portion 11 at the initial position.

Of course, in other technical solutions, the positioning element 7 may not be provided, and the position or the elastic coefficient of the elastic element 6 may be adjusted, so that the elastic force given to the locking hook 1 by the elastic element 6 when the limiting portion 11 stays at the initial position is abutted against the gravity of the locking hook 1.

Therefore, under the action of external force, the lock hook 1 can rotate anticlockwise; after the external force is relieved, the locking hook 1 can return clockwise to rotate.

The lock lever 2 is installed at an opening side of the window 4 (see fig. 2 and 3), the lock lever 2 moves with the movement of the window 4, and the position of the lock lever 2 corresponds to the lock hook 1. In the process of closing the window, when the window 4 is to be closed, the lock lever 2 moves toward the lock hook 1, specifically, moves toward and approaches the stopper portion 11. Referring to the state b in fig. 4 and fig. 5, the side of the limiting portion 11 facing the lock rod 2 is provided with an inclined surface, the lock rod 2 abuts against the inclined surface of the limiting portion 11, the lock rod 2 overcomes the driving force mainly generated by the elastic member 6 (torsion spring) to abut against the limiting portion 11 from the initial position, and at this time, the lock hook 1 rotates counterclockwise integrally under the action of the external force of the lock rod 2. When the position limiting part 11 moves out of the initial position, it is defined that the lock hook 1 is in the first state, at this time, the lock rod 2 enters and passes through the initial position and then reaches the locking position of the lock rod 2 (when the lock rod 2 stays at the locking position, the window 4 is in the completely closed state), at this time, the external force of the lock rod 2 acting on the lock hook 1 is released, the lock hook 1 returns due to the driving force mainly generated by the elastic member 6 (torsion spring), the position limiting part 11 immediately returns to block the lock rod 2 to limit the lock rod 2 to move reversely, the locking of the window 4 is completed, as shown in the state c in fig. 4, at this time, the lock hook.

After the window 4 is locked, the window 4 is not easily opened even if the window 4 is burned to be deformed or wind factors are present in a high temperature environment of a fire. (see fig. 2) and, because the two lock hooks 1 and the two corresponding lock rods 2 are arranged in the present embodiment, that is, two-point locking is formed on the opening side of the window 4, compared to the single-point locking in the form of a latch bolt in fig. 1, the window 4 is less likely to generate a large gap or reopen with the frame 5 due to burning deformation.

The unlocking process of the window 4 is completed by the unlocking assembly 3, as shown in fig. 6, and the unlocking process is finally completed from the state c to the state d to the state a. In the locking state, the lock rod 2 is driven by the link mechanism 31 to move upward, the lock rod 2 is separated from the limiting part 11, the lock rod 2 is driven by the link mechanism 31 to move leftward (in this case, the window opening operation is performed), and the lock rod 2 is driven by the link mechanism 31 to descend to the standby position before the window is closed, that is, the state a.

The lock lever 2 is driven by a link mechanism 31, and the link mechanism 31 is driven by a handle 32.

As shown in fig. 3 and 7. The handle 32 is rotatably provided, and the lever 321 is provided on the handle 32, and the lever 321 rotates when the handle 32 is rotated. The link mechanism 31 is provided with a transmission member 311 at a position about the middle in the length direction, the transmission member 311 is two protrusions extending in the transverse direction, and the shift lever 321 is clamped between the two protrusions. Therefore, when the shift lever 321 rotates reciprocally, the driving member 311 can be shifted to reciprocate in the vertical direction, so that the link mechanism 31 can be shifted to reciprocate in the vertical direction, and the link mechanism 31 drives the lock rod 2 to complete the unlocking action.

In addition, a torsion spring (not shown) may be disposed in the handle 32, so that the handle 32 is automatically returned by the torsion spring after the handle 32 is unlocked.

In this embodiment, as shown in fig. 4, a torsion spring is used to generate a main driving force for the latch hook 1. In other embodiments, a straight spring may be used as the elastic member 6, as shown in fig. 10. It is even possible to generate the main driving force for the locking hook 1 by the spring element 6 acting together with a torsion spring and a straight spring.

In the present embodiment, as shown in fig. 4, the driving force acting on the latch hook 1 is formed by the elastic member 6 and the weight of the latch hook 1. In other technical solutions, the driving force may also be formed by the gravity of the locking hook 1, as shown in fig. 8 and 9, no elastic element is provided in both solutions, and the locking hook 1 is driven by the gravity of the locking hook 1 to maintain the limiting portion 11 at the initial position.

In the present embodiment, as shown in fig. 4, the latch hook 1 is rotatably disposed. In other technical solutions, the locking hook 1 may also be movably disposed, for example, as shown in fig. 9, a fixed rod fixed to the locking hook 1 is slidably disposed in the sliding slot 9, and the sliding slot 9 extends in the vertical direction. The latch hook 1 can reciprocate in the length direction of the slide groove 9.

As shown in fig. 7, the specific structure of the link mechanism 31 is such that the link mechanism 31 includes an elongated link 312, the link 312 may be a single long rod, the link 312 may also be formed by connecting multiple (e.g., two) segments of the strut 3121, the two struts 3121 may be connected by conventional means in the art, such as forming holes at both ends of the strut 3121, overlapping the holes at the ends of the adjacent struts 3121, inserting bolts into the holes, and fastening the bolts with nuts. The connecting rod 312 is formed by connecting at least two supporting rods 3121, so that the size of the packing box can be reduced, and the packing box is easier to transport.

In this embodiment, as shown in fig. 7, the transmission member 311 is disposed in the middle of the connecting rod 312, and the lock lever 2 is fixed at both ends of the connecting rod 312. The link mechanism 31 and the handle 32 are often provided in the window 4 because when the handle 32 is provided in the window 4, (see fig. 2 and 3) the handle 32 can be pushed by the way to open the window 4 when the handle 32 is rotated to be unlocked, and there is no need to change hands. The link mechanism 31 is also provided in the window 4 as needed in cooperation with the handle 32. The lock rod 2 is fixed on the link mechanism 31, that is, the lock rod 2 is arranged on the window 4, because the structure of the lock rod 2 is simple, the structure of the window 4 is not obviously increased, and the stability of the lock hook 1 is not affected, compared with the fireproof lock with the bolt structure in fig. 1, the processing of the window 4 is easier.

Accordingly, the locking hook 1 and its adjacent components are arranged on the frame 5 of the window. If the locking hook 1 is disposed on the link mechanism 31, it is also possible, for example, to fix the lock rod 2 on the frame 5 of the window, the locking hook 1 is disposed on the opening side of the window 4 together with the link mechanism 31, and the locking hook 1 is pushed away from the locking rod 2 by the action of the link mechanism 31 to unlock the window during unlocking, but at this time, since the locking hook 1 needs to move along with the link mechanism 31 and the window 4 (for example, frequent window opening and closing actions), the structure of the locking hook 1 and its nearby components is more complicated relative to the lock rod 2, and frequent movement easily affects the stability of the locking hook 1, for example, the limiting portion 11 may move away from the initial position, which may cause the locking performance of. Therefore, it is preferable that the lock lever 2 is provided on the window 4 together with the link mechanism 31 and the lock hook 1 is provided on the frame 5 of the window, which can secure the locking performance of the window.

In this embodiment, the link mechanism 31 is slidably provided in the edge profile 41 of the window 4 (see fig. 3).

A sliding groove is provided in the profile 41. As shown in fig. 11 and 12, the card 313 is rotatably disposed on the connecting rod 312, the card 313 is rotated until the two side edges are flush with the two side edges of the connecting rod 312, the connecting rod mechanism 31 is integrally placed in the sliding groove of the profile 41, the card 313 is rotated to make the two side edges of the card 313 exceed the two side edges of the connecting rod 312, and the rotated card 313 is fastened with the connecting rod 312 through a bolt, so that the connecting rod mechanism 31 stays in the sliding groove without falling out due to the action of the card 313, as shown in fig. 12.

The principle of the embodiment is as follows:

referring to fig. 4, the locking process is described, in a state a, when the window is closed, the lock rod 2 moves toward the lock hook 1 along with the window, the lock rod 2 contacts the limiting portion 11, and the lock hook 1 rotates counterclockwise by acting on the limiting portion 11, in a state b, after the lock rod 2 passes through an initial position where the limiting portion 11 originally stays and enters a locking position of the lock rod 2, the limiting portion 11 returns to lock the lock rod 2 by the action of the elastic member 6 (torsion spring), in a state c.

The unlocking process is described with reference to fig. 6, in the state c, the handle on the window is rotated, the rotation of the handle is converted into the linear motion of the link mechanism 31, the link mechanism 31 drives the lock rod 2 to move upwards to be disengaged from the locking position of the lock rod 2, the lock rod 2 is separated from the limiting part 11 to complete unlocking, and in the state d, the handle window can be opened by pulling, and the lock rod 2 is away from the lock hook 1 along with the movement of the window. The handle 32 is returned by the torsion spring provided in the handle 32, bringing the link mechanism 31 together with the lock lever 2 to the preparatory position before closing the window, such as the a state.

Of course, the window lock of the present invention is not limited to use in fire resistant windows, and is in principle suitable for any type of window that needs to be closed.

The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and to implement the present invention, so as not to limit the protection scope of the present invention, and all equivalent changes or modifications made according to the spirit of the present invention should be covered by the protection scope of the present invention.

Claims (10)

1. A window lock, comprising:

the locking hook (1), the said locking hook (1) has spacing department (11), the said locking hook (1) is driven the force to make the said spacing department (11) maintain in the initial position;

the locking device comprises a locking rod (2), one of the locking rod (2) and the locking hook (1) is arranged on one of the frames of the window and the window, and the other of the locking rod (2) and the locking hook (1) is correspondingly arranged on the other of the frames of the window and the window;

the lock hook (1) at least has a first state and a second state, when the lock hook (1) is in the first state, the limiting part (11) is in a position far away from the initial position to allow the lock rod (2) to pass through the initial position to enter a locking position, when the lock hook (1) is in the second state, the limiting part (11) is in the initial position, and the limiting part (11) limits the lock rod (2) in the locking position to lock the lock rod (2);

unblock subassembly (3), unblock subassembly (3) are including link mechanism (31) and rotatable handle (32) that can be in rectilinear direction reciprocating motion, be provided with driving medium (311) in link mechanism (31), thereby be provided with in handle (32) and stir driving medium (311) stir driving lever (321) of link mechanism (31), latch hook (1) with one in locking lever (2) set up in link mechanism (31), work as when link mechanism (31) remove can with locking lever (2) with spacing portion (11) separation is in order to relieve the locking.

2. A window lock as defined in claim 1, wherein: the driving force is formed by the gravity of the locking hook (1) only.

3. A window lock as defined in claim 1, wherein: the driving force comprises elastic force formed by an elastic piece (6) acting on the lock hook (1).

4. A window lock as defined in claim 3, wherein: the elastic member (6) comprises a torsion spring or a straight spring.

5. A window lock as defined in claim 1, wherein: the lock hook (1) is rotatably or movably arranged.

6. A window lock as defined in claim 5, wherein: the locking mechanism further comprises a positioning piece (7), wherein the positioning piece (7) is arranged in a motion path of the locking hook (1) so as to accurately enable the limiting part (11) to stay at the initial position.

7. A window lock as defined in claim 1, wherein: the lock hook (1) and the corresponding lock rod (2) are respectively provided with one or more than one.

8. A window lock as defined in claim 1, wherein: the link mechanism (31) comprises a connecting rod (312), the transmission part (311) is arranged on the connecting rod (312), one of the lock hook (1) and the lock rod (2) is also arranged on the connecting rod (312), and the connecting rod (312) is formed by one or more sections of supporting rods (3121) which are connected with each other.

9. A window lock as defined in claim 1, wherein: the link mechanism (31) is slidably arranged in an edge profile of the window or the frame of the window.

10. A window based on a window lock, comprising a window (4), a frame (5) of the window, a window closer (8) arranged between the window (4) and the frame (5), and window locks distributed over the window (4) and the frame (5), characterized in that the window lock comprises:

the locking hook (1), the said locking hook (1) has spacing department (11), the said locking hook (1) is driven the force to make the said spacing department (11) maintain in the initial position;

the locking device comprises a locking rod (2), one of the locking rod (2) and the locking hook (1) is arranged on one of a window (4) and a window frame (5), and the other of the locking rod (2) and the locking hook (1) is correspondingly arranged on the other of the window (4) and the window frame (5);

the lock hook (1) at least has a first state and a second state, when the lock hook (1) is in the first state, the limiting part (11) is in a position far away from the initial position to allow the lock rod (2) to pass through the initial position to enter a locking position, when the lock hook (1) is in the second state, the limiting part (11) is in the initial position, and the limiting part (11) limits the lock rod (2) in the locking position to lock the lock rod (2);

unblock subassembly (3), unblock subassembly (3) are including link mechanism (31) and rotatable handle (32) that can be in rectilinear direction reciprocating motion, be provided with driving medium (311) in link mechanism (31), thereby be provided with in handle (32) and stir driving medium (311) stir driving lever (321) of link mechanism (31), latch hook (1) with one in locking lever (2) set up in link mechanism (31), work as when link mechanism (31) remove can with locking lever (2) with spacing portion (11) separation is in order to relieve the locking.

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