CN213087698U - Door lock - Google Patents

Abstract

The application provides a door lock, which comprises a middle frame, a handle assembly, a clutch plate, a plunger and a shifting block, wherein the handle assembly is rotationally arranged on the middle frame; the clutch plate is arranged on the middle frame in a sliding manner, and a first positioning groove and a second positioning groove are arranged on the clutch plate at intervals along the sliding direction of the clutch plate; the plunger is arranged on the middle frame and elastically abuts against the clutch plate; the shifting block is arranged on the middle frame in a sliding manner and is mutually connected with the clutch plate, the shifting block is used for driving the clutch plate to slide, when the clutch plate slides, the plunger selectively slides to the first positioning groove to position the clutch plate at the first position or slides to the second positioning groove to position the clutch plate at the second position, and when the clutch plate is positioned at the first position, the clutch plate is mutually clamped with the handle assembly; when the clutch plate is in the second position, the clutch plate disengages the handle assembly. The application provides a lock can drive separation and reunion board locking handle subassembly or loosen the handle subassembly through stirring the shifting block, and structural design is simple reasonable, the production equipment of the lock of being convenient for.

Description

Door lock

Technical Field

The application relates to the technical field of locks, in particular to a door lock.

Background

The door lock on the market is generally provided with child lock device at present, after opening child lock device, can make the handle unable rotation to the condition that prevents indoor children or pet etc. from pulling the handle and running out from indoor under the circumstances of not allowing takes place. However, the existing door lock for children has a complicated structural design, which increases a certain difficulty for the production and assembly of the door lock, and needs to be improved urgently.

SUMMERY OF THE UTILITY MODEL

It is an object of the present application to provide a door lock to solve the above problems. The embodiment of the application realizes the aim through the following technical scheme.

The application provides a door lock, which comprises a middle frame, a handle assembly, a clutch plate, a plunger and a shifting block, wherein the handle assembly is rotationally arranged on the middle frame; the clutch plate is arranged on the middle frame in a sliding manner, and a first positioning groove and a second positioning groove are arranged on the clutch plate at intervals along the sliding direction of the clutch plate; the plunger is arranged on the middle frame and elastically abuts against the clutch plate; the shifting block is arranged on the middle frame in a sliding manner and is mutually connected with the clutch plate, the shifting block is used for driving the clutch plate to slide, when the clutch plate slides, the plunger selectively slides to the first positioning groove to position the clutch plate at the first position or slides to the second positioning groove to position the clutch plate at the second position, and when the clutch plate is positioned at the first position, the clutch plate is mutually clamped with the handle assembly; when the clutch plate is in the second position, the clutch plate disengages the handle assembly.

In one embodiment, the door lock further comprises a torsion spring, one end of the torsion spring being rotatably connected to the clutch plate, and the other end of the torsion spring being rotatably connected to the center frame.

In one embodiment, the torsion spring includes a first winding portion, a second winding portion, a third winding portion, a first torsion arm and a second torsion arm, the first torsion arm is connected between the first winding portion and the second winding portion, the second torsion arm is connected between the first winding portion and the third winding portion, and in a balanced state of the torsion spring, a connection line between a center point of the second winding portion and a center point of the third winding portion is perpendicular to a sliding direction of the clutch plate.

In one embodiment, the middle frame is provided with a shifting block sliding groove, the shifting block is contained in the shifting block sliding groove and is in sliding fit with the shifting block sliding groove, one end of the shifting block is connected to the clutch plate, the other end of the shifting block protrudes out of the middle frame, and the stroke of the shifting block in the shifting block sliding groove is larger than or equal to the distance between the first positioning groove and the second positioning groove.

In one embodiment, the clutch plate is provided with a clutch plate chute, the door lock further comprises a clutch plate connecting piece, the clutch plate connecting piece is contained in the clutch plate chute and connected to the middle frame, and the stroke of the clutch plate connecting piece in the clutch plate chute is greater than or equal to the distance between the first positioning groove and the second positioning groove.

In one embodiment, the clutch plate connecting piece comprises a clutch plate connecting column and a connecting end cover, the clutch plate connecting column is accommodated in the clutch plate sliding groove, one end of the clutch plate connecting column is connected to the middle frame, the other end of the clutch plate connecting column is connected with the connecting end cover, the clutch plate is arranged between the middle frame and the connecting end cover, and the clutch plate is abutted to the connecting end cover.

In one embodiment, the clutch plate comprises a first clamping part, the handle assembly comprises a second clamping part, and the first clamping part and the second clamping part are matched with each other; when the clutch plate is positioned at the first position, the first clamping part and the second clamping part are clamped with each other; when the clutch plate is located at the second position, the first clamping part is separated from the second clamping part.

In one embodiment, the first engaging portion is a slot, and the second engaging portion is a clip; the door lock further comprises a guide post, the guide post is contained in the clamping groove and connected to the middle frame, and the guide post is in sliding fit with the clamping groove.

In one embodiment, the handle assembly comprises a handle and a handle limiting cover, the handle is rotatably arranged on the middle frame, the handle limiting cover is rigidly connected with the handle, and the clamping feet are arranged on the handle limiting cover.

In one embodiment, the plunger comprises a positioning tube, an elastic part and a ball, the elastic part is arranged in the positioning tube, one end of the positioning tube is arranged in the middle frame, the other end of the positioning tube is provided with the ball, the ball can rotate relative to the positioning tube, and the ball abuts against the elastic part and the clutch plate respectively.

Compared with the prior art, the lock that this application embodiment provided is equipped with first constant head tank and second constant head tank on the clutch plate, through mutually supporting of plunger and first constant head tank and second constant head tank, when stirring the shifting block and drive the clutch plate and slide, can accurately fix a position the clutch plate in primary importance and second place to locking handle subassembly perhaps loosens handle subassembly, structural design is simple reasonable, the production equipment of the lock of being convenient for.

Drawings

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

Fig. 1 shows a schematic sectional view of a door lock provided in an embodiment of the present application.

Fig. 2 shows a schematic structural diagram of a door lock provided in an embodiment of the present application.

Fig. 3 shows another schematic structural diagram of the door lock provided by the embodiment of the present application.

Fig. 4 shows an exploded view of a door lock provided in an embodiment of the present application.

Fig. 5 is a schematic structural diagram of a door lock provided by the embodiment of the application in a state that a clutch plate locks a handle assembly.

Fig. 6 is a schematic structural view illustrating a door lock according to an embodiment of the present application in a state where a clutch plate releases a handle assembly.

Detailed Description

To facilitate an understanding of the embodiments of the present application, the embodiments of the present application will be described more fully below with reference to the accompanying drawings. Preferred embodiments of the present application are given in the accompanying drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the examples of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

Fig. 1 shows a schematic sectional view of a door lock provided in an embodiment of the present application, and as shown in fig. 1, a door lock 100 provided in an embodiment of the present application includes a center frame 10, a handle assembly 20, a clutch plate 30, a plunger 40, and a dial 50.

The handle assembly 20 is rotatably provided to the middle frame 10; the clutch plate 30 is slidably arranged on the middle frame 10, and the clutch plate 30 is provided with a first positioning groove 31 and a second positioning groove 32 at intervals along the sliding direction; the plunger 40 is arranged on the middle frame 10 and elastically pushes against the clutch plate 30; the shifting block 50 is slidably disposed on the middle frame 10 and is connected to the clutch plate 30, the shifting block 50 is used for driving the clutch plate 30 to slide, when the clutch plate 30 slides, the plunger 40 selectively slides to the first positioning groove 31 to position the clutch plate 30 at the first position or slides to the second positioning groove 32 to position the clutch plate 30 at the second position, when the clutch plate 30 is at the first position, the clutch plate 30 and the handle assembly 20 are engaged with each other (see fig. 5), and at this time, the handle assembly 20 is locked and cannot rotate; when the clutch plate 30 is in the second position, the clutch plate 30 is disengaged from the handle assembly 20 (see FIG. 6), and the handle assembly 20 is free to rotate.

It should be noted that the door lock 100 may be an electronic lock or a mechanical lock, and the door lock 100 may be installed on one side of various door bodies such as a security door located indoors. After the door is installed, the door body can be unlocked and locked by rotating the handle assembly 20. When the shifting block 50 drives the clutch plate 30 to slide to the first position, the handle assembly 20 is locked and cannot rotate the handle assembly 20, so that a child or a pet in a room can be prevented from rotating the handle assembly 20 to open the door under the condition of no permission, and the safety of the door lock is improved.

The lock 100 that this application embodiment provided passes through plunger 40 and mutually supporting of first constant head tank 31 and second constant head tank 32, can be with accurately fix a position plywood 30 in primary importance and second place to locking handle subassembly 20 or unclamping handle subassembly 20, structural design is simple reasonable, the production equipment of the lock 100 of being convenient for.

Fig. 2 shows a schematic structural diagram of the door lock provided in the embodiment of the present application, and as shown in fig. 1 and fig. 2, the door lock 100 further includes a bottom plate 60, where the bottom plate 60 is substantially a rectangular parallelepiped plate-shaped structure and is configured to be mounted on a door body. The middle frame 10 can be installed on the bottom plate 60 through fasteners such as screws, after installation, the middle frame 10 and the bottom plate 60 are enclosed to form a cuboid shell structure with an accommodating space inside, the clutch plate 30 and the plunger 40 are installed in the accommodating space, and the handle assembly 20 and the shifting block 50 are partially located in the accommodating space and partially located outside the accommodating space.

After the door lock 100 is installed on the door body, the length directions of the middle frame 10 and the bottom plate 60 may be parallel to the rotation axis of the door body or perpendicular to the rotation axis of the door body, and the handle assembly 20 and the shifting block 50 may be respectively located at two sides of the length direction of the middle frame 10. The sliding direction of the shifting block 50 is consistent with the length direction of the middle frame 10, that is, the shifting block 50 can be shifted along the length direction of the middle frame 10, so as to drive the first positioning groove 31 or the second positioning groove 32 on the clutch plate 30 to slide to the position of the plunger 40. The second positioning grooves 32 and the first positioning grooves 31 are arranged at intervals along the length direction of the middle frame 10, the second positioning grooves 32 are positioned between the first positioning grooves 31 and the handle assembly 20, and when the shifting block 50 is shifted towards the handle assembly 20, the first positioning grooves 31 are matched with the plungers 40 to position the plywood 30 at a first position; the second detent 32 cooperates with the plunger 40 to position the clutch plate 30 in the second position when the paddle 50 is toggled in a direction away from the handle assembly 20.

In this embodiment, the middle frame 10 includes a supporting plate 11 and a cover plate 12, the supporting plate 11 and the bottom plate 60 are spaced from each other, the middle frame 10 further includes a frame 13 disposed between the supporting plate 11 and the bottom plate 60, the supporting plate 11 and the frame 13 can be integrally formed, the supporting plate 11 and the bottom plate 60 can be detachably connected through fasteners such as screws, and assembly and maintenance are facilitated.

The clutch plate 30 is slidably disposed on the support plate 11, the first positioning groove 31 and the second positioning groove 32 are disposed on a side of the clutch plate 30 facing the support plate 11, and the plunger 40 is disposed on a side of the support plate 11 facing the clutch plate 30. During the equipment, can install plunger 40 in backup pad 11 earlier, correspond plunger 40 with clutch plate 30 and install in backup pad 11 again, connect shifting block 50 in clutch plate 30 again, can accomplish the assembled connection between clutch plate 30, plunger 40 and the shifting block 50, it is very convenient to assemble.

The supporting plate 11 is further provided with a mounting groove 111 (see fig. 4), the mounting groove 111 penetrates through the supporting plate 11, and the cover plate 12 is disposed on a side of the supporting plate 11 away from the bottom plate 60 and covers the mounting groove 111. The cover plate 12 is provided with a shifting block sliding groove 121, the shifting block sliding groove 121 can be a runway-shaped sliding groove penetrating through the opposite surface of the cover plate 12, and the shifting block 50 is accommodated in the shifting block sliding groove 121 and is in sliding fit with the shifting block sliding groove 121.

One end of the shifting block 50 is connected to the clutch plate 30, and the other end of the shifting block 50 protrudes out of one side of the cover plate 12 away from the clutch plate 30, so that a user can shift the shifting block 50. The travel of the shifting block 50 in the shifting block sliding groove 121 is greater than or equal to the distance between the first positioning groove 31 and the second positioning groove 32. When the stroke of the shifting block 50 in the shifting block sliding groove 121 is equal to the distance between the first positioning groove 31 and the second positioning groove 32, when the shifting block 50 drives the clutch plate 30 to slide to the first position and the second position, the shifting block 50 just abuts against the inner wall of the cover plate 12 in the shifting block sliding groove 121, and the shifting block 50 can be limited, so that the clutch plate 30 can accurately slide to the first position and the second position. Of course, the travel of the dial 50 in the dial slide groove 121 may be greater than the distance between the first positioning groove 31 and the second positioning groove 32, as long as the travel is not less than the distance between the first positioning groove 31 and the second positioning groove 32.

The shifting block 50 can comprise a shifting block cap 51 and a shifting block connecting column 52, the shifting block cap 51 is positioned on one side of the cover plate 12 departing from the clutch plate 30, and the cross sectional area of the shifting block cap 51 can be larger than that of the shifting block sliding groove 121, so that the shifting block cap 51 can completely cover the shifting block sliding groove 121, and dust, water vapor and the like are prevented from entering the middle frame 10 through the shifting block sliding groove 121. One end of the shifting block connecting column 52 is connected to the shifting block cap 51, the other end of the shifting block connecting column 52 sequentially penetrates through the shifting block sliding groove 121 and then is connected to the clutch plate 30, and the shifting block connecting column 52 is in sliding fit with the shifting block sliding groove 121 and further can drive the clutch plate 30 to slide through the shifting block cap 51. The shifting block cap 51 and the shifting block connecting column 52 can be integrally formed, and the shifting block connecting column 52 and the clutch plate 30 can be detachably connected through fasteners such as screws.

The cover plate 12 is provided with a cover plate supporting part 122 protruding towards one side of the clutch plate 30, the cover plate supporting part 122 is of an annular structure, the cover plate supporting part 122 is limited to form a shifting block sliding groove 121, the cover plate supporting part 122 abuts against the clutch plate 30, the cover plate supporting part 122 can be used for supporting the clutch plate 30, and the structural stability of the clutch plate 30 is improved.

Fig. 3 shows another structural schematic diagram of the door lock provided in the embodiment of the present application, and as shown in fig. 1 and fig. 3, the door lock 100 may further include a panel 61, the panel 61 is mounted on a side of the cover plate 12 facing away from the support plate 11, and the handle assembly 20 and the dial 50 are partially exposed from the panel 61. By attaching the panel 61 to the outer surface of the door lock 100, the appearance of the door lock 100 can be more uniform.

Fig. 4 shows an exploded view of the door lock provided in the embodiment of the present application, and referring to fig. 1 and fig. 4, the plunger 40 includes a positioning tube 41, an elastic member (not shown) and a ball 42, the elastic member is disposed in the positioning tube 41, one end of the positioning tube 41 is disposed on the support plate 11, the other end of the positioning tube 41 is disposed with the ball 42, the ball 42 can rotate relative to the positioning tube 41, and the ball 42 abuts against both the elastic member and the clutch plate 30. The elastic member may be a spring, a spring sheet, or other elastic member, and is configured to provide thrust for the ball 42 toward the clutch plate 30, so that the ball 42 can always abut against the clutch plate 30.

The first and second positioning grooves 31 and 32 are substantially in the form of pits, and the distance between the first and second positioning grooves 31 and 32 is the distance from the center of the first positioning groove 31 to the center of the second positioning groove 32. The first positioning groove 31 and the second positioning groove 32 can be in zero clearance fit with the ball 42, and the groove wall surfaces defining the first positioning groove 31 and the second positioning groove 32 can smoothly transit with the outer surface of the clutch plate 30, so that the ball 42 can slide in and out conveniently.

As an example, when the clutch plate 30 is pushed from the first position to the second position, the ball 42 first disengages from the first detent 31 and is compressed into the detent tube 41, and the elastic member in the detent tube 41 generates an elastic force on the ball 42 toward the clutch plate 30, and when the ball 42 reaches the second detent 32, the ball 42 enters the second detent 32 under the elastic force, and the clutch plate 30 can be positioned in the second position by the engagement of the second detent 32 and the ball 42.

Fig. 5 is a schematic structural view of the door lock provided in the embodiment of the present application in a state where the clutch plate-locking handle assembly is assembled, and referring to fig. 4 and 5, the door lock 100 further includes a torsion spring 70, one end of the torsion spring 70 is rotatably connected to the clutch plate 30, and the other end of the torsion spring 70 is rotatably connected to the middle frame 10.

The torsion spring 70 is used for providing a torsion force consistent with the sliding direction of the clutch plate 30, that is, the torsion spring 70 provides a pushing force for the clutch plate 30 to move towards the first position when the clutch plate 30 moves towards the first position, and provides a pushing force for the clutch plate 30 to move towards the second position when the clutch plate 30 moves towards the second position, so that the plunger 40 can smoothly slide from the first positioning groove 31 to the second positioning groove 32, or slide from the second positioning groove 32 to the first positioning groove 31, and cannot stay between the first positioning groove 31 and the second positioning groove 32, thereby avoiding the occurrence of the condition of the child lock failure.

The torsion spring 70 may be a three-circle torsion spring, the torsion spring 70 includes a first winding portion 71, a second winding portion 74, a third winding portion 75, a first torsion arm 72 and a second torsion arm 73, the first torsion arm 72 is connected between the first winding portion 71 and the second winding portion 74, the second torsion arm 73 is connected between the first winding portion 71 and the third winding portion 75, and in a balanced state of the torsion spring 70, a connection line between a center point of the second winding portion 74 and a center point of the third winding portion 75 is perpendicular to a sliding direction of the clutch plate 30. The second winding portion 74 is riveted to the clutch plate 30 such that the second winding portion 74 can freely rotate relative to the clutch plate 30, and the third winding portion 75 is riveted to the cover plate 12 such that the third winding portion 75 can freely rotate relative to the cover plate 12. The balanced state of the torsion spring 70 means that the first torsion arm 72 and the second torsion arm 73 are in an unstressed state, and the balanced point of the torsion spring 70 is located on the connecting line between the central point of the second winding portion 74 and the central point of the third winding portion 75. It will be appreciated that the position of the clutch plate 30 is between the first and second positions when the torsion spring 70 is in the equilibrium state. When the clutch plate 30 moves towards the first position, the torsion spring 70 is deformed by the external force, and when the deformation reaches the torsion transition state (i.e. crosses the equilibrium state), the torsion spring 70 starts to provide a pushing force for the clutch plate 30 to move towards the first position; when the clutch plate 30 moves toward the second position, the torsion spring 70 is deformed by the external force, and when the deformation reaches the torsion transition state, the torsion spring 70 starts to provide a pushing force for the clutch plate 30 to move toward the second position.

In one embodiment, the clutch plate 30 is further provided with a clutch plate sliding slot 33, the door lock 100 further includes a clutch plate connecting member 80, the clutch plate connecting member 80 is accommodated in the clutch plate sliding slot 33 and connected to the middle frame 10, and a stroke of the clutch plate connecting member 80 in the clutch plate sliding slot 33 is greater than or equal to a distance between the first positioning slot 31 and the second positioning slot 32. The clutch plate connecting member 80 is in sliding fit with the clutch plate sliding groove 33, and can provide a guiding function for the clutch plate 30, so that the clutch plate 30 is prevented from deviating from the set sliding direction.

The stroke of the clutch plate connecting piece 80 in the clutch plate sliding groove 33 refers to the slidable distance of the clutch plate connecting piece 80 in the clutch plate sliding groove 33, the stroke of the clutch plate connecting piece 80 in the clutch plate sliding groove 33 can be equal to the distance between the first positioning groove 31 and the second positioning groove 32, when the plunger 40 slides to the first positioning groove 31 or the second positioning groove 32, the clutch plate connecting piece 80 just abuts against the inner wall of the clutch plate 30 in the clutch plate sliding groove 33, further sliding of the clutch plate 30 can be limited, and the plunger 40 is prevented from sliding to the positions outside the first positioning groove 31 and the second positioning groove 32. Of course, the travel of the clutch plate coupler 80 within the clutch plate slot 33 may be greater than the distance between the first detent 31 and the second detent 32, as long as it is not less than the distance between the first detent 31 and the second detent 32.

The clutch plate connecting member 80 may include a clutch plate connecting post 81 and a connecting end cover 82, the clutch plate connecting post 81 is received in the clutch plate sliding groove 33, one end of the clutch plate connecting post 81 is connected to the middle frame 10, and the other end of the clutch plate connecting post 81 is connected to the connecting end cover 82. The clutch plate 30 is positioned between the middle frame 10 and the connecting end cover 82, and the connecting end cover 82 abuts against the clutch plate 30, so that the clutch plate 30 is limited, the clutch plate 30 is ensured to slide between the middle frame 10 and the connecting end cover 82, and can be kept abutting against the plunger 40. The clutch plate connecting piece 80 can be a screw with a head at one end, and has a simple structure, so that the cost can be effectively reduced.

The clutch plate 30 may include a clutch plate body portion 34 and a clutch plate connecting portion 35, the clutch plate body portion 34 being located between the handle assembly 20 and the dial 50 (see fig. 1), the clutch plate connecting portion 35 being provided on a side wall of the clutch plate body portion 34 facing the dial 50, the dial 50 and the torsion spring 70 both being connected to the clutch plate connecting portion 35. The number of the clutch plate chutes 33 may be two, and the two clutch plate chutes 33 are respectively provided on both sides of the clutch plate body portion 34 in the length direction. Correspondingly, the number of the clutch plate connecting pieces 80 is two, and the sliding direction of the clutch plate 30 can be ensured not to change in the sliding process through the mutual matching of the two clutch plate chutes 33 and the two clutch plate connecting pieces 80. Of course, in some other embodiments, the number of the clutch plate chutes 33 may be one or more than three, which is not particularly limited in this embodiment.

Fig. 6 is a schematic structural diagram of a door lock provided in an embodiment of the present application in a state that a clutch plate releases a handle assembly, as shown in fig. 6, in this embodiment, a clutch plate 30 includes a first engaging portion 36, a handle assembly 20 includes a second engaging portion 21, and the first engaging portion 36 and the second engaging portion 21 are adapted to each other; when the clutch plate 30 is located at the first position, the first engaging portion 36 and the second engaging portion 21 are engaged with each other, and the handle assembly 20 is locked; when the clutch plate 30 is at the second position, the first engaging portion 36 is disengaged from the second engaging portion 21, and the handle assembly 20 can rotate freely. The door lock 100 can lock the handle assembly 20 by engaging the first engaging portion 36 with the second engaging portion 21, and has a simple and practical structure.

The first engaging portion 36 may be one of a card slot and a card leg, and the second engaging portion 21 may be the other of the card slot and the card leg. In this embodiment, the first engaging portion 36 is a slot, and the second engaging portion 21 is a pin. The draw-in groove is the open slot of rectangle form approximately, and the draw-in groove can set up between two separation and reunion board spouts 33, and the card foot can be massive structure, the mutual adaptation of appearance profile of draw-in groove and card foot, and when separation and reunion board 30 moved the primary importance, the card foot can move to the draw-in groove in, the realization is to the locking of handle subassembly 20.

In other embodiments, the first engaging portion 36 may be a locking pin, and the second engaging portion 21 may be a locking slot, which can also lock the handle assembly 20.

In this embodiment, the door lock 100 may further include a guiding post 90, the guiding post 90 is received in the slot and connected to the middle frame 10, and the guiding post 90 is in sliding fit with the slot for guiding the moving direction of the clutch plate 30, so that the slot can be accurately engaged with the engaging pin. The guide posts 90 may be studs, dowel pins, or other fasteners, and may be conveniently attached to the center frame 10.

In the present embodiment, the handle assembly 20 includes a handle 22 and a handle stopper cover 23, the handle 22 is rotatably disposed on the middle frame 10, the handle stopper cover 23 is rigidly connected to the handle 22, and the second engaging portion 21 is disposed on the handle stopper cover 23. The handle limiting cover 23 is installed in the middle frame 10, and the handle 22 at least partially extends into the middle frame 10 and is used for being rigidly connected with the handle limiting cover 23. When the clutch plate 30 moves to the first position, the first engaging portion 36 engages with the second engaging portion 21 of the handle stopper cover 23, and at this time, the handle stopper cover 23 is locked, and the handle 22 cannot rotate. When the clutch plate 20 moves to the second position, the first engaging portion 36 is disengaged from the second engaging portion 21, the handle stopper cover 23 is unlocked, and the handle 22 can be freely rotated.

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

Claims (10)

1. A door lock, comprising:

a middle frame;

the handle assembly is rotatably arranged on the middle frame;

the clutch plate is arranged on the middle frame in a sliding manner, and a first positioning groove and a second positioning groove are arranged at intervals along the sliding direction of the clutch plate;

the plunger is arranged on the middle frame and elastically abuts against the clutch plate; and

the shifting block is slidably arranged on the middle frame and is mutually connected with the clutch plate, the shifting block is used for driving the clutch plate to slide, when the clutch plate slides, the plunger selectively slides to the first positioning groove to position the clutch plate at a first position or slides to the second positioning groove to position the clutch plate at a second position, and when the clutch plate is positioned at the first position, the clutch plate and the handle assembly are mutually clamped; when the clutch plate is in the second position, the clutch plate disengages the handle assembly.

2. The door lock of claim 1, further comprising a torsion spring, one end of the torsion spring being rotatably coupled to the clutch plate and the other end of the torsion spring being rotatably coupled to the center frame.

3. The door lock of claim 2, wherein the torsion spring includes a first winding portion, a second winding portion, a third winding portion, a first torsion arm and a second torsion arm, the first torsion arm is connected between the first winding portion and the second winding portion, the second torsion arm is connected between the first winding portion and the third winding portion, and a connection line between a center point of the second winding portion and a center point of the third winding portion is perpendicular to a sliding direction of the clutch plate in a balanced state of the torsion spring.

4. The door lock according to claim 1, wherein the middle frame is provided with a shifting block sliding groove, the shifting block is accommodated in the shifting block sliding groove and is in sliding fit with the shifting block sliding groove, one end of the shifting block is connected to the clutch plate, the other end of the shifting block protrudes out of the middle frame, and the stroke of the shifting block in the shifting block sliding groove is larger than or equal to the distance between the first positioning groove and the second positioning groove.

5. The door lock of claim 1, wherein the clutch plate has a clutch plate slot, the door lock further comprises a clutch plate connector received in the clutch plate slot and connected to the middle frame, and a stroke of the clutch plate connector in the clutch plate slot is greater than or equal to a distance between the first positioning groove and the second positioning groove.

6. The door lock of claim 5, wherein the clutch plate connecting member comprises a clutch plate connecting column and a connecting end cover, the clutch plate connecting column is accommodated in the clutch plate sliding groove, one end of the clutch plate connecting column is connected to the middle frame, the other end of the clutch plate connecting column is connected to the connecting end cover, the clutch plate is arranged between the middle frame and the connecting end cover, and the clutch plate abuts against the connecting end cover.

7. The door lock of claim 1, wherein the clutch plate includes a first engaging portion, the handle assembly includes a second engaging portion, and the first engaging portion and the second engaging portion are adapted to each other; when the clutch plate is located at the first position, the first clamping part and the second clamping part are clamped with each other; when the clutch plate is located at the second position, the first clamping part is separated from the second clamping part.

8. The door lock of claim 7, wherein the first engaging portion is a slot and the second engaging portion is a pin; the door lock further comprises a guide post, the guide post is contained in the clamping groove and connected to the middle frame, and the guide post is in sliding fit with the clamping groove.

9. The door lock of claim 7, wherein the handle assembly includes a handle rotatably disposed on the center frame and a handle retention cap rigidly coupled to the handle, the second engagement portion being disposed on the handle retention cap.

10. The door lock according to claim 1, wherein the plunger comprises a positioning tube, an elastic member and a ball, the elastic member is disposed in the positioning tube, one end of the positioning tube is disposed in the middle frame, the other end of the positioning tube is disposed with the ball, the ball can rotate relative to the positioning tube, and the ball abuts against the elastic member and the clutch plate respectively.

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