KR102599754B1 - Push-Pull type Door Lock - Google Patents

Abstract

The present invention relates to a push-pull type door lock capable of opening a door by unlocking the door even though a handle is pushed or pulled from either the inside or the outside of the door; and performing a stopper function by including a buffer spring between an inner handle and an outer handle. The push-pull type door lock comprise: the inner handle (10); the outer handle (20); a plate-shaped slide key (30); a latch body (40); a latch body holder (50); and the buffer spring (60). The inner handle (10) forwardly and backwardly moves to an inner cover (15) provided inside the door. The outer handle (20) forwardly and backwardly moves to an outer cover (25) provided outside the door. The plate-shaped slide key (30) forwardly and backwardly moves by the inner handle (10) or the outer handle (20) by allowing one end to be connected to the inner handle (10) and allowing the other end to be connected to the outer handle (20); forms a bearing mounting groove (35) in a middle part; and forms a sloped inner cam surface (36) and a sloped outer cam surface (37) in both sides of the bearing mounting groove (35). The latch body (40) includes a latch (45) for locking the door by being inserted into a locking groove of a door frame in a front end unit; and includes a bearing member mounted in the bearing mounting groove (35) of the slide key (30) in a back end unit. The latch body holder (50) guides a latch body (40) by being installed inside the door, and elastically supports the latch body (40) by using a spring with a latch fixing holder (55) through which the latch (45) passes in a front end unit. The buffer spring (60) is installed between the inner handle (10) and the outer handle (20).

Description

Push-pull type door lock {Push-Pull type Door Lock}

The present invention relates to a push-pull type door lock. More specifically, the present invention relates to a push-pull type door lock, which allows the door to be unlocked and opened by simply pushing or pulling the handle from either the inside or outside of the door, while the inner handle and the outer It relates to a push-pull type door lock that has a buffer spring between the handles to perform the function of a stopper and at the same time allows the latch to come out of the latch groove and easily open or close the door by simply pressing a button.

Generally, a door lock refers to a locking device installed on a door for security or crime prevention.

These door locks come in various forms, but a locking device such as a mortise or latch assembly is installed on the side of the door, and the outdoor and indoor sides of the door are connected to the locking device to enable the operation of the locking device. A 'rotary door lock' is mainly used in which the door handles are installed to face each other, so that when the door handle is rotated, the striker of the lock slides due to the rotational force of the door handle, allowing the door to be opened and closed.

However, in the rotary door lock as described above, the door handle must be rotated at a predetermined angle to open and close the door, and the striker of the lock operates by sliding to open and close the door. Therefore, it is difficult to hold an object in both hands or use the door handle because it is difficult to use the hands. In cases where it is difficult to rotate the door, it is inconvenient to open and close the door.

Accordingly, various methods are being studied to allow the striker of the lock to be slidably operated without gripping the door handle. For example, there is a method of changing the structure of the door handle so that it can be rotated by applying force from the top or bottom of the door handle. In this case, the force applied in a direction perpendicular to the rotation axis of the door handle is accumulated and causes damage to internal components. There is a problem that wear phenomenon occurs and operability is reduced or lifespan is shortened.

In addition, in order to solve the above-described shortcomings of the rotary door lock, a push-pull type door lock has been developed that allows the striker of the lock to slide by the force of pushing or pulling the door handle. A push-pull type door lock moves the pivoted power conversion member back and forth as the door handle rotates by pushing or pulling the end of the door handle that is pivotably coupled to the power conversion member, and the striker of the lock operates by sliding by the power conversion member. Consists of.

However, the conventional push-pull type door lock described above requires a power conversion member to convert the rotational movement of the door handle into linear movement, which has the problem of complicating the overall structure and increasing manufacturing costs.

Meanwhile, as a result of researching prior art related to the present invention, a number of patent documents were searched, some of which are introduced as follows.

Patent Document 1 provides a door lock, comprising: a pair of fixing bodies formed with through holes fixed to both sides of the door; a pair of lever handles each inserted into a through hole of the fixing body and installed to correspond to each other, including a shaft portion having an internal space with open ends at both ends; It includes a push operation unit installed to protrude from both ends of the inner space and operates the latch by pushing an operation pin installed on the latch bolt, wherein the push operation unit includes a push button installed so that one side protrudes from the outer end; a pushing member installed at an inner end so that a pushing surface, which is in contact with the operating pin, protrudes, and has a pinhole formed in the middle portion; a guide nut installed in the inner space of the inner end and having a guide through hole for guiding the pressing member; It is installed on the outside of the pushing member and consists of a coil spring that is installed between the guide nut and the fixing pin installed in the pinhole to elastically support the pushing member, and the latch bolt can be operated by a push button installed on the lever handle. A push-type lever-type door lock is being disclosed that allows the door to be opened without rotating the lever handle.

Patent Document 2 includes a drive shaft configured to penetrate the door in the thickness direction of the door, configured to enable reciprocating movement in the thickness direction of the door, and having a cylindrical or polygonal column shape; A latch driving part on one side of which a latch is coupled, and on the other side of which a latch is coupled to a drive shaft; a linear latch shaft disposed on the other side of the latch drive unit to intersect the transverse direction of the drive shaft; And a guide rail provided in the shape of a diagonal or arcuate line on one side of the drive shaft, on which the latch shaft is seated, and providing drive for at least one of protrusion and retraction of the latch. It includes a guide rail that does not hold or grab the handle of the door to turn it, but pushes the door handle. A door opening and closing device that can open a door with a simple movement of a single step, such as pushing or pulling, and a door using the same are disclosed.

Patent Document 3 discloses that a lever with a protrusion formed on the door side is provided on the front of a housing that is respectively coupled to the front and rear of the door by a support so that it can rotate back and forth, and the lever rotates with the lever between the housing and the supports on the front and rear of the door. A driving part is provided that releases the lock by rotating the actuator that moves by the protrusion and leads to the locking mechanism built into the door. The driving part is driven in both push and pull operations of the lever, thereby releasing the locking mechanism built into the door, thereby opening the door. A push-pull door lock is disclosed that allows installation without the need to match the direction and lever operation direction.

Patent Document 4 includes a base that forms an installation hole and is installed to face each other on the inside/outside of the door; A cover formed with a guide hole and installed on the outer surface of the base; A power conversion member installed to enable rotation and sliding within the guide hole; A door handle that is pivotably coupled to the power conversion member to enable rotation and sliding of the power conversion member; A rotating body rotatably installed inside the installation hole of the base to rotate with the power conversion member or to be rotatable by the power conversion member; A rod combination that has one end coupled to the rotating body and the other end coupled to an operating rod that enables the operation of a mortise installed on the side of the door to transmit the rotating force of the rotating body to the operating rod; By installing a coil spring into the base and including a return ring that returns the rod assembly rotated by the rotational force of the rotating body to its original position, the convenience of operating the door handle is improved, making it easier to open the door, and it is compact. A push-pull type door lock is being introduced that improves product productivity and ease of design development by reducing the volume by having a single structure.

Patent Document 5 provides a latch assembly equipped with a latch bolt and a latch drive shaft, and an inner member constituting a door lock body is installed inside the latch assembly, and a return spring and a fixing plate are provided in the driven rotor coupling groove formed on the inner member. A driven rotating body consisting of a shaft coupling hole for attaching a latch drive shaft and a rotating toothed cam is coupled, and a linear toothed cam is formed on the inner member at a position corresponding to the rotating toothed cam formed on the driven rotating body. It is configured to be coupled to the cam holder to enable straight movement, and a lever equipped with a pressing member to press the direct-acting toothed cam is installed on the outside of the inner member that constitutes the door lock body. The structure for operating the latch bolt is very simple. We are launching a push-and-pull type door lock that is simple, greatly improves productivity and assembly, reduces manufacturing costs, operates smoothly, and reduces failure rates.

Patent Document 6 states that the inner and outer body assemblies are coupled to a square shaft that passes through the latch assembly with the latch assembly in between, and a lever is connected to the outside, and the inner and outer body assemblies are composed of modules having plates, operating members, links, cams, etc. , The link of the module is configured to give the lever the elasticity necessary for return while maintaining the given position by the upper and lower link positions elastically installed on the module case with springs, so it is a relatively simple structure that can satisfy the return function of the lever. -We are launching a pull-type door lock.

KR 10-1191925 B1 KR 10-2015-0094192 A KR 20-2014-0005051 U KR 10-1666764 B1 KR 10-1664777 B1 KR 10-1775331 B1

The present invention was developed to solve the problems of the prior art described above, and allows the door to be unlocked and opened simply by pushing or pulling the handle from either the inside or the outside of the door. A buffer spring is provided between the inner handle and the outer handle to perform the function of a stopper, and at the same time, a push-pull type door lock is provided that allows the latch to come out of the latch groove and easily open or close the door by simply pressing a button. It has a purpose.

The present invention for achieving the above object includes an inner handle movable back and forth installed on the inner cover provided on the inner side of the door; An outer handle movable back and forth installed on the outer cover provided on the outside of the door; One end is connected to the inner handle and the other end is connected to the outer handle, and is moved back and forth by the inner or outer handle. A bearing seating groove is formed in the middle, and an inclined inner cam surface and an outer cam surface are formed on both sides of the bearing seating groove. Slide key in the shape of a plate; A latch body provided at the front end with a latch that is inserted into the locking groove of the door frame to lock the door, and a bearing member installed at the rear end to be seated in the bearing seating groove of the slide key; A latch body holder is installed inside the door to guide the latch body and includes a latch fixing holder at the front end from which a latch appears, and elastically supports the latch body using a spring. And a buffer spring installed between the inner handle and the outer handle.

In addition, according to the push-pull type door lock of the present invention, the inner cover and the outer cover are formed to protrude outward and have a cylindrical protrusion at the end coupled with a handle support plate for supporting the inner handle or the outer handle, and the inner cover The coupling portion of the handle and the outer handle is detachably coupled to the slide key protruding to the outside of the protrusion, and the coupling portion inserted into the interior of the coupling portion supports the buffer spring.

In addition, according to the push-pull type door lock of the present invention, the inner cover and the outer cover each have at least two engaging protrusions that protrude in the inward direction to protect the slide key, and the engaging protrusions of the inner cover and the engaging protrusions of the outer cover It is characterized in that it is coupled in a concavo-convex manner and is integrally connected by fixing bolts.

In addition, according to the push-pull type door lock of the present invention, it further includes a lock key provided on the inner cover to prevent the latch body from moving.

In addition, according to the push-pull type door lock of the present invention, the latch has an inclined surface portion arranged to face one side of the door, a flat portion disposed to face the other side of the door, and the tips of the inclined surface portion and the flat portion are vertically aligned. It includes a coupling protrusion formed to protrude from a portion where the connected front end portion and the inclined surface portion are connected to the rear end of the flat portion and is coupled to the latch body, and guide protrusions in the longitudinal direction are formed on both sides in the width direction of the flat portion, respectively, and the flat portion includes It is characterized in that the tip portion forms an inclined connection.

The push-pull type door lock of the present invention not only unlocks the door and opens or closes the door by simply pushing or pulling the inner handle or outer handle through the structure of the slide plate, but also has a buffer spring between the inner handle and the outer handle. It is equipped with a stopper function that not only returns the inner and outer handles to their initial positions, but also prevents damage to the wall by the buffering action of the buffer spring when the door is opened. Even if the user hits the handle, minor injury is guaranteed. There is an effect that only occurs.

In addition, according to the push-pull type door lock of the present invention, since the inner handle and the outer handle are detachably coupled to the slide key, various types of doors can be constructed by changing the design of the inner handle and outer handle, and can be used as needed. This has the effect of allowing the inner and outer handles to be easily replaced.

In addition, according to the push-pull type door lock of the present invention, it can be used regardless of the thickness of the door as the coupling protrusions of the inner cover and the outer cover are coupled in an uneven manner, and the inner cover and the outer cover are stably fixed to the door. There is.

In addition, according to the push-pull type door lock of the present invention, the lock key is installed on the inner cover, which has the effect of safely protecting privacy by preventing the door from being opened from the outside.

In addition, according to the push-pull type door lock of the present invention, an inclined connection is provided at the tip of the latch and guide protrusions are provided on both sides of the flat part of the latch, so the contact area between the latch and the latch groove is reduced, thereby reducing friction resistance. This has the effect of making the movement of the latch smoother.

Figure 1 is a perspective view showing a push-pull type door lock according to the present invention.
Figure 2 is a front view of the push-pull type door lock according to the present invention as seen from the latch side.
Figure 3 is a perspective view showing the slide key of the push-pull type door lock according to the present invention.
Figure 4 is a cut-away perspective view of a push-pull type door lock according to the present invention.
Figure 5 is a cross-sectional view of a push-pull type door lock according to the present invention.
Figure 6 is a perspective view showing the latch of a push-pull type door lock according to the present invention.

Hereinafter, the push-pull type door lock of the present invention will be described with reference to the attached drawings.

The terms used in the present invention are terms defined in consideration of the functions in the present invention, and may vary depending on the intention or custom of the user or operator, so the definitions of these terms are defined in accordance with the technical details of the present invention. It should be interpreted as a concept.

In addition, the embodiments of the present invention do not limit the scope of the present invention, but are merely illustrative of the components presented in the claims of the present invention, and are included in the technical idea throughout the specification of the present invention and are included in the claims. This is an embodiment that includes components that can be replaced as equivalents in the components.

Additionally, optional terms in the examples below are used to distinguish one component from another component, and the components are not limited by the terms.

Accordingly, when describing the present invention, detailed descriptions of related known technologies that may unnecessarily obscure the gist of the present invention are omitted.

To explain a preferred embodiment of the present invention, Figure 1 is a perspective view showing a push-pull type door lock according to the present invention, Figure 2 is a front view of the push-pull type door lock according to the present invention seen from the latch side, and Figure 3 is a front view showing a push-pull type door lock according to the present invention. It is a perspective view showing the slide key of the push-pull type door lock according to the present invention, and Figure 4 is a cut-away perspective view of the push-pull type door lock according to the present invention, and Figure 5 is a cross-sectional view of the push-pull type door lock according to the present invention. Figure 6 is a perspective view showing the latch of the push-pull type door lock according to the present invention.

As shown in Figures 1 to 6, the push-pull type door lock according to the present invention includes an inner handle 10, an outer handle 20, a slide key 30, and a latch body 40 provided with a latch 45, It includes a latch body holder (50), a buffer spring (600), and a lock key (70).

The inner handle 10 is installed to be movable back and forth on the inner cover 15 provided on the inside of the door, and is formed to protrude on the inside, supports the buffer spring 60, and is bolted to the slide key 30. It consists of a protrusion 11 and a body 12 that forms the outline of the handle and is integrally formed with the protrusion 11. At this time, the body 12 may be formed in a circular, rectangular, or square shape, or may be formed in a diamond shape or star shape. Colored stickers may be attached to the outer surface to improve aesthetics, or fluorescent stickers may be attached to improve visibility at night. can also be improved.

At this time, the inner cover 15 is formed to protrude outward and has a cylindrical protrusion 16 coupled with a handle support plate 16' supporting the inner handle 10 at the end thereof, and a protrusion 16 protruding inward to hold the slide key. It is provided with two or more coupling protrusions (16) that protect (30). Accordingly, the coupling portion 11 of the inner handle 10 is detachably coupled to the slide key 30 protruding outside the protrusion 16 of the inner cover 15 and is inserted into the protrusion 16. The coupling portion 11 supports the buffer spring 60. Additionally, the inner cover 15 is preferably provided with a lock key 70 to prevent the latch body 30 from moving.

The outer handle 20 is installed to be movable back and forth on the outer cover 15 provided on the outside of the door, and is formed to protrude on the inside to support the buffer spring 60 and is bolted to the slide key 30. It consists of a protrusion 21 and a body 22 that forms the outline of the handle and is integrally formed with the protrusion 21. At this time, the body 22 may be formed in a circular, rectangular, or square shape, or may be formed in a diamond shape or star shape. Colored stickers may be attached to the outer surface to improve aesthetics, or fluorescent stickers may be attached to improve visibility at night. can also be improved.

At this time, the outer cover 25 also has a cylindrical protrusion 26 that protrudes outward and is coupled with a handle support plate 26' supporting the outer handle 20 at the end, and protrudes inward to slide. It is provided with two or more engaging protrusions (26) that protect the key (30). Accordingly, the coupling portion 21 of the outer handle 20 is detachably coupled to the slide key 30 protruding outside the protrusion 26 of the inner cover 25 and is inserted into the protrusion 26. The coupling portion 21 supports the buffer spring 60.

Accordingly, the inner handle 10 and the outer handle 20 can be replaced as needed, and the bodies 12 and 22 of the inner handle 10 and the outer handle 20 can have different shapes or You can do the same. In addition, the coupling protrusion 16 of the inner cover 15 and the coupling protrusion 26 of the outer cover 25 are coupled in an uneven manner and are integrally connected using fixing bolts 17, thereby reducing the thickness error of the door. It is desirable to absorb it and allow it to be installed closely to the door.

As shown in FIG. 3, the slide key 30 connects the inner handle 10 and the outer handle 20 so that the inner handle 10 and the outer handle 20 move back and forth as one unit. It is made up of shapes. In addition, a bearing seating groove 35 is formed in the middle part of the slide key 30 to move the latch body 40, and an inclined inner cam surface 36 and an outer cam surface are formed on both sides of the bearing seating groove 35. (37) is formed.

The latch body 40 is provided at the rear end with a bearing member (not shown) that is seated in the bearing seating groove 35 of the slide key 30, and the direction of movement of the slide key 30 depends on the movement of the slide key 30. It moves in a direction perpendicular to . At this time, a latch 45 is installed at the tip of the latch body 40, which is inserted into the locking groove of the door frame and locks the door.

And the latch body holder 50 is installed inside the door to guide the latch body 40 inside, and is provided with a latch fixing holder 55 on which the latch 45 appears at the front end. And the latch body holder 50 elastically supports the latch body 40 using a spring (not shown), thereby fixing the position of the latch body 40.

The latch body 40 and the latch body holder 50 described above are collectively referred to as a latch assembly. Since the structure of the latch assembly is not particularly limited, a detailed description thereof will be omitted.

However, as shown in FIG. 6, the latch 45 includes an inclined surface portion 45a disposed to face one side of the door, a flat portion 45b disposed to face the other side of the door, and an inclined surface portion. The front end portion 45c, where the front end of (45a) and the flat portion 45b are vertically connected, and the portion where the inclined surface portion 45a and the rear end of the flat portion 45b are connected are formed to protrude and are coupled to the latch body 40. It includes a coupling protrusion (45d). At this time, longitudinal guide protrusions 45e are formed on both sides of the flat portion 45b in the width direction, and the tip of the flat portion 45b forms an inclined connection portion 45f. In this way, as the latch 45 is provided with the inclined connection portion 45f and the guide protrusion 45e, the contact area between the latch 45 and the latch groove is reduced, thereby reducing frictional resistance, thereby smoothing the movement of the latch 45. .

The buffer spring 60 is installed between the inner handle 10 and the outer handle 20, and returns the inner handle 10 and the outer handle 20 to their initial positions when the door is opened, as well as the inner handle 10. ) or the moment the outer handle (20) touches the wall, etc., it is pushed inward and absorbs the shock. Therefore, it performs the function of a door stopper that prevents damage to the wall due to excessive opening of the door, and also ensures that only minor damage occurs even if a user hits it.

The operation of the push-pull type door lock of the present invention configured as described above will be described as follows.

The inner handle 10 or the outer handle 20 installed on the door is pushed or pulled considering the opening direction of the door 100.

That is, when the door is opened inward, the slide key 30 is moved inward and the buffer spring 60 is compressed by pulling the inner handle 10 or pushing the outer handle 20. Accordingly, the bearing member located in the bearing seating groove 38 of the slide key 30 is moved by the outer cam surface 37 of the slide key 30, and at the same time, the latch body 40 is moved by the latch body holder 50. It moves by squeezing the spring. Accordingly, the latch 45 connected to the latch body 40 comes out of the latch groove and is stored inside the latch fixing holder 55 of the latch body holder 50. Accordingly, as soon as the door is unlocked, the door rotates inward and opens, and the force applied to the inner handle (10) or the outer handle (20) is removed by the elastic force of the buffer spring (60) and the inner handle (10). ) and the outer handle 20 return to their initial positions.

Conversely, when the door is opened outward, the slide key 30 is moved outward and the buffer spring 60 is compressed by pushing the inner handle 10 or pulling the outer handle 20. Accordingly, the bearing member located in the bearing seating groove 38 of the slide key 30 is moved by the inner cam surface 36 of the slide key 30, and at the same time, the latch body 40 is moved by the latch body holder 50. It moves by squeezing the spring. Accordingly, the latch 45 connected to the latch body 40 comes out of the latch groove and is stored inside the latch fixing holder 55 of the latch body holder 50. Accordingly, as soon as the door is unlocked, the door rotates inward and opens, and the force applied to the inner handle (10) or the outer handle (20) is removed by the elastic force of the buffer spring (60) and the inner handle (10). ) and the outer handle 20 return to their initial positions.

In addition, regardless of the opening direction of the door, when the inner handle 10 or the outer handle 20 is lightly pressed, the slide key 30 moves and moves the latch body 30 to release the latch 45 from the latch groove. In addition to the release, the buffer spring 60 is compressed, and then the inner handle 10 and the outer handle 20 are returned to their initial positions by the buffer spring 60. In this way, when the latch comes out of the latch groove, the door is easily opened by the force pushing the door, so even the elderly and infirm can easily open the door.

Although the present invention has been described and illustrated in relation to several embodiments to illustrate the technical idea of the present invention, the present invention is not limited to the configuration and operation as described, and is within the scope of the technical idea described in the description of the invention. Those skilled in the art will be able to understand that many changes and modifications can be made to the present invention without departing from the above. Accordingly, all such appropriate changes, modifications and equivalents shall be considered to fall within the scope of the present invention.

10...inner handle
11...joint part
12...Body
15...inner cover
16...Protrusion
16'...Handle support plate
17...Combining protrusions
18...fixing bolt
20...outside handle
21...joint part
22...Body
25...outer cover
26...Protrusion
26'...Handle support plate
27...Combining protrusion
30...Slide key
35...Bearing seating groove
36...inner cam surface
37...outer cam surface
40...latch body
45...latch
45a...slope part
45b...flat part
45c... front section
45d...Combining protrusion
45e...guide projection
45f...inclined connection
50...Latch body holder
55...Latch fixing holder
60...lock key

Claims (5)

An inner handle (10) installed to be movable back and forth on the inner cover (15) provided on the inner side of the door;
An outer handle (20) installed to be movable back and forth on the outer cover (25) provided on the outside of the door;
One end is connected to the inner handle (10) and the other end is connected to the outer handle (20). It is moved back and forth by the inner handle (10) or the outer handle (20), and a bearing seating groove (35) is formed in the middle part to seat the bearing. A slide key 30 in the shape of a plate with inclined inner cam surfaces 36 and outer cam surfaces 37 formed on both sides of the groove 35;
A latch body 40 having a latch 45 inserted into the locking groove of the door frame and locking the door at the front end and a bearing member seated in the bearing seating groove 35 of the slide key 30 at the rear end;
The latch body holder (50) is installed inside the door to guide the latch body (40) and is provided with a latch fixing holder (55) from which the latch (45) appears at the front end to elastically support the latch body (40) using a spring. ); and
It includes a buffer spring (60) installed between the inner handle (10) and the outer handle (20),
The latch 45 includes an inclined surface portion 45a disposed to face one side of the door, a flat portion 45b disposed to face the other side of the door, and the inclined portion 45a and the flat portion 45b. It includes a front end portion 45c whose front end is vertically connected and a coupling protrusion 45d formed to protrude from a portion where the rear end of the inclined surface portion 45a and the flat portion 45b are connected and coupled to the latch body 40, A push-pull type door lock characterized in that longitudinal guide protrusions (45e) are formed on both sides of the flat portion (45b) in the width direction, and the tip of the flat portion (45b) forms an inclined connection portion (45f). . According to paragraph 1,
The inner cover 15 and the outer cover 25 are formed to protrude outward and have a cylindrical shape with handle support plates 16' and 26' attached to the ends to support the inner handle 10 or the outer handle 20. It is provided with protrusions (16) (26),
The coupling portions 11 and 21 of the inner handle 10 and the outer handle 20 are detachably coupled to the slide key 30 protruding outward from the protrusions 16 and 26, and the protrusions 16 ) A push-pull type door lock, characterized in that the coupling portion (11) (21) inserted into the inside of (26) supports the buffer spring (60). According to paragraph 1,
The inner cover 15 and the outer cover 25 each have at least two engaging protrusions 17 and 27 that protrude inward and protect the slide key 30,
A push-pull type door lock characterized in that the engaging protrusion (17) of the inner cover (15) and the engaging protrusion (27) of the outer cover (25) are coupled in an uneven manner and are integrally connected by a fixing bolt (18). According to paragraph 1,
A push-pull type door lock further comprising a lock key (70) provided on the inner cover (15) to prevent the latch body (30) from moving. delete

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