KR20170023452A

KR20170023452A - Door latch assembly

Info

Publication number: KR20170023452A
Application number: KR1020150118599A
Authority: KR
Inventors: 여주희
Original assignee: 동성산업 주식회사
Priority date: 2015-08-24
Filing date: 2015-08-24
Publication date: 2017-03-06
Also published as: WO2017034079A1

Abstract

The present invention relates to a door latch assembly, which comprises a case (100) formed of right and left divided bodies and having an installation hole (101) formed on both sides thereof and an opening (103) A locking member 300 for locking the door by controlling the turning operation of the hub 200 and a sliding member 300 for sliding the door 200 by rotation of the hub 200. [ A door latch assembly comprising a sliding member (400) tilting to a coil spring (401) for operation and a latch bolt (500) installed to allow the opening (103) And a latch bolt 500 for sliding and rotating operation. Thus, it is possible to improve the operability of the latch bolt when the door is opened, Not Ever to occur in and at the same time can achieve the purpose of allowing a door to suppress noise in the open and closed process.

Description

Door latch assembly < RTI ID = 0.0 >

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a door latch assembly for controlling the opening and closing of a door, and more particularly, to a door latch assembly capable of suppressing noise generation and enabling stable operation during a door closing operation.

The door latch assembly is a core part used in a door lock device called a door. When the door is closed, the latch bolt protrudes due to the action of the spring when the door is closed. The latch bolt is inserted into the catch box formed in the door frame, When the door handle provided outside is rotated, the latch bolt is inserted into the door to open the door, which is the most important component in the door locking device.

Since such door latch assemblies can be commonly used in door locks of various designs, manufacturers manufacturing door locks have developed a door latch assembly that can achieve a profitable structure in terms of productivity and manufacturing cost while having a stable structure So as to manufacture a locking device for a door.

The door latch assembly of the door locking device has been developed variously. A typical conventional door latch assembly will be described as follows.

As shown in Fig. 6, a registration wing 20-0352220 includes a housing 110, a pair of inner and outer wings, a wing having a fixing groove on a surface contacting each other is formed on the outer periphery, A hub 120, which is rotatably supported by the inner and outer knobs, and which is coupled to the inner and outer knobs provided on both sides of the door, A pair of rotation levers 130 that are rotated by a hub rotation of the rotation lever, a slide member 140 that is linearly moved by the rotation lever when the rotation lever is rotated, A latch head 150 for locking or unlocking the door after being moved to the inside of the housing by the operation of the latching mechanism 150, and a housing space formed therein, wherein two through- And a pair of balls for adjusting a position in combination with the two through holes are provided at the center of the body, a fixing protrusion for fixing the hub by engaging with the fixing groove of the hub is formed at one side of the body, (160) formed of a locking pin formed on the other side of the fixing protrusion, and an elastic member (170) installed between the sliding member and the inter-holder and restoring the sliding member In the latch assembly,

Wherein the hub is provided with a wing at an outer periphery at a predetermined interval on a surface contacting each other and the latch head is installed such that a part of the rear portion is always received in the opening of the body so as not to be shaken or rotated, A first through hole and a third through hole are formed at predetermined intervals in the body, and the fixing protrusions are formed at one side of the body so as to be accommodated between the wings of the hub formed at regular intervals, And a locking pin formed on the other side of the fixing protrusion such that an end portion thereof is larger and both sides are formed as a curved portion.

Japanese Patent Application Laid-Open Publication No. 10-1533194 discloses an ink jet recording head in which mounting holes 13 are formed on both sides as shown in Figs. 7 to 8, and openings are formed at one end portions thereof, A body (11, 12); Hubs (21, 22) rotatably mounted on installation holes (13) of the bodies (11, 12); A coupling member 30 installed inside the bodies 11 and 12 and having guide grooves formed in the lateral direction; A locking member (40) provided on the guide groove of the engaging member (30) so as to be movable laterally and provided with a locking lever for setting the locking of the door on one side; A sliding member 50 which is tilted by the first coil spring 51 inside the bodies 11 and 12 to slide by the rotation of the hubs 21 and 22; A support plate 60 installed inside the bodies 11 and 12; And a latch bolt (70) provided at an opening of the body (11, 12) to control the opening and closing of the door, wherein the body (11, 12) And the coupling member 30 is formed with a coupling protrusion through which the coupling hole 14 penetrates and is extended and fixed by punching. The coupling holes 16 are formed in the bodies 11 and 12 And a coupling piece 61 fitted to the coupling groove 16 is formed in the support plate 60 to have a rigid coupling structure.

Registration Utility Model Bulletin No. 20-0352220 (June 28, 2004) Patent No. 10-1533194 (Feb.

In the conventional door latch assembly as described above, an outer diameter slope is commonly formed at a corner of a front end portion, and a latch bolt or a latch head (hereinafter referred to as a latch bolt) for locking or unlocking the door by advancing or retracting by rotation of the door handle The door frame on which the doors are installed is provided with a catch box into which the latch bolts are inserted.

Therefore, even if the door is closed without the operation of the door handle in the state where the latch bolt protrudes from the housing, the outer slope surface is naturally retracted while coming into contact with the protective cover of the catch box formed on the door frame, thereby making it possible to close the door without operating the door handle.

When the door is closed as described above, the latch bolt retracted into the housing by the contact with the protective cover is inserted into the catch box while being protruded from the housing again by an elastic member such as a coil spring installed inside the housing, Is prevented from being arbitrarily opened while maintaining the closed state.

However, in the conventional door latch assembly, when the door is closed, the latch bolts made of metal are brought into contact with the protective cover made of the metal material formed on the door frame, causing friction between the latch bolts and unpleasant noise that scratches the metal material, There is a problem that wear of the latch bolt and the protective cover is caused by friction between the latch bolt and the protective cover.

Such a phenomenon is more particularly caused by the fact that the lock device A1 for general rotation type doors, which is operated by rotating the door handle as shown in FIG. 8, In the case of the lock device for the push-pull type door, the latch bolt is slid using the bevel gear B as shown in the figure, so that the latch bolt is slid compared to the lock device for the rotary type door The size of the force to be used is small, so that the latch bolt is caught in the catch box more severely.

In addition, in the conventional door latch assembly, when the operator can not accurately install the door latch assembly due to insufficient function in the process of installing the door latch assembly on the door, the latch bolt is not correctly inserted into the catch box, When the door handle is rotated to open the closed door when the latch bolt is caught in the catch box, the latch bolt installed to retract by the sliding member tumbled by the coil spring rotates the door handle It is not possible to retract due to the catch box, or by repeatedly rotating the door handle, suddenly the latch bolt retracts, resulting in a strong noise and inconvenience due to various operation noises.

Therefore, there is a need to develop a door latch assembly which can prevent noise generation, which is a disadvantage of the door latch assembly of the related art, and enable stable opening and closing operation while minimizing noise even if the installation state is poor due to insufficient installation capability of a worker.

The door latch assembly according to the present invention is a door latch assembly composed of left and right divided bodies and having an installation hole 101 formed on both sides thereof and an opening portion A hub 200 rotatably installed in the installation hole 101 and a locking member 200 for controlling the rotation of the hub 200 to set the door D, A sliding member 400 which is tilted by a coil spring 401 so as to be slid by the rotation of the hub 200 and a sliding member 400 installed to move in and out of the opening 103 to open and close the door D, 1. A door latch assembly comprising a latch bolt (500)

A working rod 600 which is installed in front of the sliding member 400 and slidably moves together with the sliding member 400 tilted by the coil spring 401;

And a latch bolt 500 for sliding and rotating inside the case 100 by forming an insertion groove 501 through which the operation rod 600 enters and exits, thereby improving the operability of the latch bolt when the door is opened So that the opening and closing of the door can be stably performed even with a small force and the noise can be prevented from being generated in the process of closing the door.

In the door latch assembly of the present invention, when the door is opened, the latch bolt is rotated by the rotational force of the door to be introduced into the case, thereby preventing the engagement between the latch bolt and the catch box formed in the door frame, The opening and closing of the door can be stably performed even with a small force.

In addition, by forming the latch bolt from a synthetic resin material, it is possible to suppress the occurrence of noise during contact with the catch box protective cover made of a metal material, and at the same time, the latch bolt is combined with the protective cap made of a metal, The wear of the surface is minimized and the durability can be improved.

1 is a perspective view of an embodiment of a door latch assembly of the present invention.
2 is an exploded perspective view of an embodiment of a door latch assembly of the present invention.
3 is a plan view cross-section of an installation state according to an embodiment of the door latch assembly of the present invention.
4 is a cross-sectional plan view of the latch bolt in operation according to an embodiment of the door latch assembly of the present invention.
5 is an exploded perspective view showing another embodiment of the latch bolt according to the embodiment of the door latch assembly of the present invention.
6 and 7 are exploded perspective views showing a conventional latch bolt assembly.
Figure 8 is an illustration of a locking device for a rotating type door coupled with a conventional latch bolt assembly.
Figure 9 is an illustration of a locking device for a push-pull type door coupled with a conventional latch bolt assembly.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the structure and operation of a door latch assembly according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

The door latch assembly of the present invention comprises a case 100 formed with left and right divided bodies and having an installation hole 101 formed on both sides thereof and an opening 103 to which a cover 102 is coupled at one end, A locking member 300 for locking the door by controlling the rotation operation of the hub 200 and a locking member 300 for locking the door 200 by sliding the hub 200 in a sliding manner by the rotation of the hub 200. [ A door latch assembly 400 including a sliding member 400 that is tilted by a spring 401 and a latch bolt 500 that is installed to allow the door 103 to open and close and controls the opening of the door, And a sliding member 400 slidably mounted on the coil spring 401 and slidingly operated with the sliding member 400. The insertion slot 501 is formed with the operating rod 600 inserted therein, Sliding and rotating operation inside Enabling one to constitute a latch bolt (500).

In the present invention, the case 100, the hub 200, the locking member 300, and the sliding member 400 are well known in the technical field of the present invention, The detailed description of the hub 200, the locking member 300, and the sliding member 400 will be omitted and only the features will be described concisely.

The case 100 is formed as a left-right divided body, and a concave-convex portion is formed on a coupling surface where the right and left divided bodies are in contact with each other so that the left and right divided bodies are engaged with each other.

The case 100 may be provided with a mounting hole 101 on the left and right sides thereof so that the hub 200 can be engaged with the hub 200 and the locking member 300 can be moved left and right smoothly. .

A plurality of engaging pieces 508a are formed around the opening of the opening 103 so that the engaging pieces 508a are engaged with the operating hole of the cover 102. [ The cover 102 is installed at the entrance of the opening 103 of the case 100 by being inserted into the opening 102a.

The hub 200 is coupled to the inner and outer door handles H1 and H2 and the rotary shaft, respectively. The hub 200 is rotated and the inner surfaces of the hubs 200 are engaged with each other. The blade piece 201 is formed so that the blade piece 201 is fitted in the slot formed in the sliding member 400 so that the sliding member 400 slides forward and backward by the rotation of the hub 200. [

The locking member 300 is engaged with the locking lever 301 and the locking member 300 is inserted into the fixing groove 202 formed in the blade piece 201 of the hub 200 by the operation of the locking lever, Locking of the door is possible by inhibiting rotation.

The sliding member 400 has a shape of "C" when viewed from the side and forms a slot into which the blade piece 201 of the hub 200 is inserted so that the rotational force of the hub 200 is transmitted to the blade piece 201 So that the sliding member 400 can be slid back and forth.

The operating rod 600 has a latching portion 601 formed at its inner end so that the distal end of the operating rod 600 is passed through the opening portion 402 formed in the front surface of the sliding member 400, (601) is attached to the inner surface of the sliding member (400) in close contact with each other.

A coil spring 401 is mounted between the locking member 300 and the latching portion 601 so that the operating rod 600 of the sliding member 400 is slidably operated by the elasticity of the coil spring 401 At the same time, due to the elasticity of the coil spring 401, the operating rod 600 exerts an operating pressure on the outside of the case 100.

The latch bolt 500 is installed in the opening 103 of the case 100. An insertion groove 501 is formed at the center of the inner side of the latch bolt 500 so that the distal end of the operation rod 600 is inserted The operating pressure is applied to the outside of the case 100 by means of the operating rod 600 to which the elastic force of the coil spring 401 acts.

A plurality of locking protrusions 506 are formed on the upper and lower surfaces of the latch bolt 500 so that the latch bolt 500 is not released to the outside of the case 100, (102) coupled to the cover (103).

Guide pieces 504a and 504b are formed on the upper and lower portions of the insertion groove 501 so as to connect the inner inclined surface 504a parallel to the outer inclined surface 502 formed on the outer side and the guide surface 504b parallel to the engaging surface 503 formed on the outer side. 504 are formed so that the outline of the planar surface is formed into a rhombus shape so that the outer and inner inclined surfaces 502 and 504a are parallel to the inner surface of the case 100 when the latch bolt 500 is inserted into the case 100 The latching surface 503 and the guide surface 504b are parallel to the inner surface of the case 100 when the latch bolt 500 inserted into the case 100 is discharged to the outside of the case 100. [

The latch bolt 500 is formed of a synthetic resin material and has a plurality of coupling protrusions 507 formed on one surface thereof to form a coupling groove 508b corresponding to the coupling protrusion 507, A protective cap 508 made of a metal and having an engaging piece 508a which is inserted into the latch bolt 500 is inserted between the latch bolt 500 and the latch bolt 500 so that the outer circumferential surface 502 of the latch bolt 500 is exposed. So that the durability of the latch bolt 500 made of a synthetic resin material is ensured while the metallic noise generated during operation of the latch bolt 500 is suppressed.

The coupling between the latch bolt 500 and the protection cap 508 may be performed by using an adhesive or by forming a coupling hole 508c in the coupling piece 508a of the latch bolt 500 and the protection cap 508, It is possible to apply various coupling methods such as a method of coupling by coupling means such as a direct screw or an engagement pin.

Hereinafter, the operation of the door latch assembly according to the present invention will be described with reference to the accompanying drawings.

The door latch assembly 10 of the present invention is used in a door lock device A, which is generally installed in a room of a building, as shown in FIG. 3, and rotates the door handle to rotate the latch bolt It can be used both for type door locks and for push-pull type door locks that operate the latch bolt by pushing or pulling the door handle.

That is, in the door latch assembly 10 of the present invention, the case 100 is inserted into the installation groove formed in the door D and the cover 102 coupled to the opening 103 of the front end of the case 100 is inserted into the door D of the door 100. The latch bolt 500 protrudes to the outside of the case 100 through the operation hole 102a of the cover 102, A rotary shaft rod engaging with the outer door handles H1 and H2 is engaged with the hub 200 provided inside the case 100.

The door frame F on which the doors are installed is formed with a catch box C into which the latch bolts 500 are inserted and a protective cover c1 is provided on the outside thereof.

3, when the door is closed, the latch bolt 500 protruding out of the case 100 is inserted into the catch box C formed in the door frame F and the latching surface 503 of the latch bolt 500 Is caught on the inner surface of one side of the catch box C, thereby preventing the door from being opened arbitrarily.

The operating pressure of the operating rod 600 is applied to the outside of the case 100 by the elastic pressure of the coil spring 401 installed inside the case 100, Is inserted into the insertion groove 501 formed in the inner side surface of the latch bolt 500 to push the latch bolt 500 to the outside of the case 100. The pressure of the latch bolt 500 is applied to the outer surface of the latch bolt 500 The latching bolt 500 is firmly fixed by preventing the latching part 506 formed on the inner surface of the cover 102 provided at the tip of the case 100 from being opened.

When the door handle of any one of the inner and outer door handles H1 and H2 installed inside and outside the door D is rotated in order to open the door in the state that the door is closed as described above, The hub 200 coupled with the outer door handles H1 and H2 rotates to one side and the blade piece 201 of the hub 200 pulls the sliding member 400 toward the hub 200, The operating rod 600 coupled to the passage 402 formed at the distal end of the sliding member 400 is retracted into the case 100 together with the sliding member 400 to move the locking member 300 and the operating rod 600 together, The coil spring 401 disposed between the latching portions 601 of the operating rod 600 is compressed and discharged to the outside of the insertion groove 501 of the latch bolt 500 at the distal end portion of the operating rod 600.

Accordingly, the operating pressure of the operating rod 600 acting on the latch bolt 500 is relieved and the latch bolt 500 is free to move. When the user's door is opened in this state, And acts on the bolt 500.

At this time, since the latch bolt 500 is inserted into the catch box C formed in the door frame F, the rotational force of the door D acts on the latching surface 503 of the latch bolt 500, The outer circumferential slope 502 of the latch bolt 500 is inserted into the case 100 where the latch bolt 500 rotates in parallel with the inner surface of the case 100 and the inner circumferential surface 504a of the latch bolt 500 rotates while the operating rod 600 is retracted So that the door D is opened.

As described above, in the opening process of the door D, the latch bolt 500 is smoothly and smoothly supported by the rotational force generated when the door D is opened in a free state in which no external operating pressure acts, The operating noise generated by the latch bolt 500 is not generated at all during the opening of the door D.

When the door D is completely opened and the user releases the force to rotate the door handle, the elastic force of the coil spring 401, which has been compressed inside the case 100, 600 are further advanced toward the opening 103 of the case 100 so that the tip of the operating rod 600 is inserted into the insertion groove 501 of the latch bolt 500 inserted into the case 100 The latch bolt 500 is pushed out of the case 100 to keep the latch bolt 500 protruding from the case 100.

When the door is closed without any other operation in the state where the door is opened as described above, the outer surface of the latch bolt 500 formed on one side of the latch bolt 500 is inserted into the protective cover c1 of the entrance of the catch box C formed in the door frame F The latch bolt 500 is naturally inserted into the case 100 so that the coil spring 401 installed inside the case 100 is compressed and the door is completely closed so that the latch bolt 500 and the latch bolt 500 can be protected When the contact pressure of the cover c1 is released, the latch bolt 500 is again protruded by the restoring force of the coil spring 401 and is inserted into the catch box C, thereby closing the door D.

At this time, when the latch bolt 500 is made of a synthetic resin material and the outer circumferential surface 502 contacts the protective cover c1 made of a metal, it is possible to suppress the generation of metallic noises, The protective cap 508 made of a metal is covered with the outer surface of the latch bolt 500 so as to expose the outer diametric surface 502 of the latch bolt 500 to be coupled to the latch 100, The wear of the bolt 500 is minimized and durability can be ensured.

In order to set the door to the locked state in the state that the door is closed as described above, one end portion is provided to protrude from the inner side of the door D, and the other end portion is pressed by the locking lever 301 coupled to the locking member 300, The locking state of the door D is maintained by restricting the rotation of the hub 200 by interposing the locking member 300 in the fixing groove 202 formed in the blade piece 201 of the hub 200, D, the lock lever 301 is pulled to its original position, the lock setting is canceled as the hub 200 is rotated.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be construed as limiting the scope of the invention as defined by the appended claims. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention.

A: Door lock C: Catch box
D: Door F: Door frame
H1, H2: Door handle 10: Door latch assembly
100: Case 101: Installation hole
102: cover 103: opening
200: hub 300: locking member
400: sliding member 401: coil spring
402: Through-hole 500: Latch bolt
501: insertion groove 502: outer diameter slope
503: engaging surface 504: guide piece
504a: Inner slope surface 504b: Guide surface
506: stumbling block portion 507:
508: Protective cap 508a:
508b: engaging groove portion 600:
601:

Claims

A case 100 formed with right and left divided bodies and having an installation hole 101 formed on both sides thereof and an opening 103 to which a cover 102 is coupled at one end, A locking member 300 for locking the door D by controlling the rotation of the hub 200 and a coil spring 401 for sliding operation by the rotation of the hub 200. [ And a latch bolt (500) installed to move in and out of the opening (103) and controlling the opening of the door (D), the door latch assembly comprising:
A working rod 600 which is installed in front of the sliding member 400 and slidably moves together with the sliding member 400 tumbled by a coil spring 401;
And a latch bolt (500) for forming an insertion groove (501) through which the operation rod (600) enters and exits to enable sliding and rotation operation within the case (100).

The method of claim 1, further comprising:
The operating rod has a latching portion 601 formed at an inner end thereof and is fitted to a hole 402 formed in a front surface of the sliding member 400. The latching member 300 and the latching portion 601 , And a coil spring (401) is laid between the sliding member (400) and the sliding member (400).

The method according to claim 1,
The latch bolt 500 has an insertion groove 501 into which the distal end of the operation rod 600 is inserted at the center of the inner side of the latch bolt 500 and parallel to the outer circumferential surface 502 formed on the outer side of the insertion groove 501 A guide piece 504 formed so as to be continuous with an inner inclined surface 504a and a guide surface 504b parallel to the engaging surface 503 formed on the outer side is formed so that the outline of the planar shape becomes a rhombus shape, And a plurality of locking protrusions (506) are formed to prevent the cover (102) from being detached from the cover (102) while being caught inside the cover (102).

The method of claim 1, further comprising:
The latch bolt 500 has a plurality of engagement protrusions 507 on one surface thereof,
A protective cap 508 formed of a metal and having an engaging groove 508b corresponding to the engaging protrusion 507 and a engaging piece 508a inserted into the engaging recess 506 and fixed to the latch bolt 500, Is overlapped with the outer surface of the latch bolt (500) so that the outer circumferential surface (502) of the latch bolt (500) is exposed.