KR101745630B1

KR101745630B1 - Latch assembly for door lock

Info

Publication number: KR101745630B1
Application number: KR1020160003456A
Authority: KR
Inventors: 강대철; 송영준
Original assignee: 주식회사 정화테크
Priority date: 2016-01-12
Filing date: 2016-01-12
Publication date: 2017-06-09

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a door lock latch assembly installed in a door of an indoor space such as a bedroom or a bathroom.
The present invention provides a function for reliably locking the locking cam 38 in the retracting process of the latch bolt 44 even when the door is closed in a locked state of the unintentional locking cam 38, The locking cam 38 is engaged with the operating chamber 16 of the latch cylinder 12 so as to slide and the push rod 48 of the latch bolt 44 is engaged with the guide passage 14 The lock bolt 44 is brought into contact with the guiding slant face 62 of the locking cam 38 so as to simplify the structure for releasing the lock upon retraction of the latch bolt 44, So that even when a strong impact is applied through the latch bolt 44 during the termination operation, the related parts can be smoothly and smoothly operated at all times without any deformation or failure.

Description

LATCH ASSEMBLY FOR DOOR LOCK}

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a door lock latch assembly installed in a door of a bedroom, a bathroom, or the like, and more particularly, to a door lock latch assembly that is simple and robust in operation.

Generally, door locks installed in doors and doors of a bedroom, a bathroom, or the like provided in an indoor door of a door are constructed such that a rectangular axis connecting the inner and outer levers passes through the square holes of the inner and outer hubs of the latch assembly, The locking bar of the locking cam having the engaging means with the hub is protruded inward to push the push rod inward in the closed state of the door so that when the lever is operated, And the hub is engaged with the lock so as to lock the door by preventing rotation of the hub.

Furthermore, in the case of the elderly or children who do not understand the structural characteristics of the door lock installed at the door of the indoor space, if the push rod of the locking cam is inadvertently touched during the operation of the door lock for opening / The locking cam is locked in a locked state by the pushing rod, so that when the door is closed, the locking cam is immediately locked in the retreating process of the latching bolt It is possible to use without worrying about emergency.

As a representative prior art of a door lock latch assembly that satisfies all of these functions, a door lock latch assembly of a registered utility model No. 20-0352220 is exemplified as a block in which a holder for locking is coupled to and fixed to the housing, And the locking protrusion is selectively engaged with the fixing grooves of the inner and outer hubs to lock and unlock the lock pin during operation of the locking pin, When the latch head is retracted due to the closing of the door so as to face the narrow inclined surface of the latching head of the latch head, the locking protrusion is detached from the locking groove of the outer hub to release the locking.

Therefore, the latch for the door lock according to the above-described structure is detached from the latch due to the detachment of the holder for locking release upon retraction of the latch head by the block and the locking king pin. The locking pin facing the narrow inclined face of the housing is slid right and left perpendicularly to the operating direction of the latch head along the receiving space of the block separated from the housing so that the lock is released, The locking pin can not be operated smoothly because of the resistance. In particular, when the locking pin of the locking pin is relatively thin and weak, when the door is closed, a severe impact is applied through the latch head. There are many problems that lead to loss.

Registered Utility Model No. 20-0352220 'Door Lock Latch Assembly'

SUMMARY OF THE INVENTION It is an object of the present invention to simplify the structure for releasing the locking cam when the latch bolt is retracted and to smoothly operate the locking cam, Even if a large impact is applied to a related part for a door lock, the risk of deformation or failure of a related part is prevented.

In order to achieve the above object, the latch assembly for a door lock according to the present invention is configured such that when the latch bolt is retracted, the plunger of the latch bolt enters into the operation chamber through the guide passage of the operation cylinder of the latch cylinder, And the locking cam is slidably moved in the unlocking direction by the contact with the guide slope of the locking cam.

The door lock latch assembly 10 is constructed such that when the latch bolt 44 is retracted in the locked state of the lock knuckle 38, the part for releasing the lock is composed of the locking cam 38 and the push rod 48, It is possible to reduce the number of components for termination and to improve the productivity in the manufacturing process. In addition, when the lock releasing operation is performed, the push rod 48 guided by the guide passage 14 of the latch cylinder 12, The frictional resistance of the locking cam 38 provided in the latch cylinder 16 can be minimized and more flexible and smooth operation can be expected. Even if a severe impact is applied through the latch bolt 44 in the closing process of the door because the guide groove 14 comes into contact with the guide slope 62 of the locking cam 38 in the state where the linearity is secured by the guide passage 14, Deformation or breakage of related parts There is no effect, such as being able to guarantee a number of life.

1: perspective view of the present invention
2: exploded perspective view of the present invention
Figure 3: Attempts at the partial seam of the present invention as seen from the inner rear
Figure 4: Attempts at the partial seam of the present invention from the outer rear
5 is a perspective view of the locking cam used in the present invention,
Fig. 6 is a perspective view of the locking cam used in the present invention,
7 is a perspective view of the locking cam used in the present invention,
8: sectional view of the locking cam used in the present invention
Fig. 9 is a cross-sectional view showing the locking state of the present invention
10 is a cross-sectional view showing a locking state of the present invention
Fig. 11 is a cross-sectional view showing the lock-unlocked state due to retraction of the latch bolt in the locked state of the present invention

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings, wherein like reference numerals are used to designate like elements in the drawings, It will be omitted for the sake of clarity.

FIG. 1 is an exploded perspective view of the present invention. FIG. 2 is an exploded perspective view of the present invention. In the door lock latch assembly 10 of the present invention, a guide passage 14 is provided at a central portion of an operation space provided inside the latch cylinder 12 The operation chambers 16 are recessed and engaged with the engagement projections 18 and 20 and the wings 22 and 24 and the engagement grooves 26 and 28 And a pair of latch cams 34 and 36 are connected to the rear of the hubs 30 and 32 by using rivets to connect the latch cams 34 and 36 The locking projections 18 and 20 of the hubs 30 and 32 are positioned between the cam portions of the locking cylinder 36 and the locking cam 38 is provided in the operating chamber 16 of the latch cylinder 12. [ And the wings 22 and 24 and the latch cams 34 and 36 of the hubs 30 and 32 are provided at the center of the operating space of the latch cylinder 12 through the respective latching holes Jammed with cambu The latch bolt retractor 40 is connected to the spring 42 in a resilient manner and the latch bolt 44 is elastically connected to the front of the latch bolt retractor 40 by a spring 46, A push rod 48 that projects into and retracts into the operation chamber 16 of the latch cylinder 12 through a guide passage 14 is connected and fixed to the rear of the piston rod 44.

The latch cylinder 12 is separated into an inner and an outer case for assembly and a working chamber 16 provided at a central portion of the operating space has a locking cam 38 engaged with the inner and outer hubs 30 and 32 And the guide passage 14 is formed in the front of the operation chamber 16 so as to communicate with the operation chamber 16 so that the push rod 48 of the latch bolt 44 is inserted into the guide passage 14 So as to move in and out of the working chamber 16 with straightness.

Each of the inner and outer hubs 30 and 32 is coupled to a quadrature shaft connected between the inner and outer levers through a square hole formed at a central portion thereof and has an engagement groove 26 for engagement with the locking cam 38 Through the wing 22 (24) including the lever 28 to be engaged with the latch bolt retractor 40 so that the latch bolt can be engaged with the latch bolt retractor 40 during the independent rotation operation by the operation of the inner lever or the outer lever The latch bolt 44 is retreated to open the door.

It is possible to smoothly engage with the locking cam 38 in the locking groove 26 of the inner hub 30 of the inner and outer hubs 30 and 32 connected to the rear of the operating space of the latch cylinder 12 It is preferable to form an inclined surface to be formed.

FIG. 6 is a perspective view of the locking cam used in the present invention as seen from the inner front side, and FIG. 7 is a perspective view of the locking cam used in the present invention as viewed from the inner rear side. 8 is a sectional view of the locking cam used in the present invention. The locking cam 38 used in the present invention has a connecting portion 54 for connecting the push rod 52 to the inner central portion of the body 50, And a second engaging projection 56 engaging with the inner hub 30 through a first engaging projection 56 for engaging with the outer hub 32 and an inclined face 58 formed on both sides of the body 50, And a guide slope 62 is formed on the outer side of the body 50. [

Hereinafter, the operation of the present invention will be described with reference to FIGS. 9 to 11. FIG.

9 is a cross-sectional view showing the locking projection according to the present invention. In the door lock latch assembly 10 of the present invention, when the locking cam 38 is unlocked, the latch bolt 44 is latched from the latch cylinder 12 to the latch bolt re- The end of the push rod 48 projecting forward by the spring 40 and the springs 42 and 46 and connected to the rear of the latch bolt 44 is engaged with the guide passage 14 of the latch cylinder 12 And the locking cams 38 are displaced inward from the plungers 48 located behind the latch bolts 44 while the first and second locking projections 56 and 60 are engaged with the inner and outer hubs 30 The hub 30 or 32 can be rotated freely when the outer lever or the inner lever is operated so that the latch bolt 44 is retracted from the latching groove 26 The opening is made.

9, the door is freely opened and closed to enter the inner space, and when the lock is desired, the push rod 52 of the locking cam 38 is opened, The locking cam 38 slides in the outward direction along the operating space of the latch cylinder 12 so that the first and second locking projections 56 and 60 are engaged with the inner and outer hubs 30 32 so that the outer hub 32 can not be rotated even if the outer lever is operated from the outside.

When the inner lever is operated on the inner side in this locked state, the force is transmitted to the inner hub 30, and the inclined surface on both sides of the engaging groove 26 of the inner hub 30 and the second surface of the locking cam 38 The second locking protrusion 60 is easily detached from the locking groove 26 of the inner hub 30 by the guide of the inclined surface 58 of the locking protrusion 60 so that the locking cam 52 The locking of the locking cam 38 is released without the operation of the door 38, so that the door can be opened.

11 is a cross-sectional view showing the lock-unlocked state when the latch bolt is retracted in the locked state according to the present invention. When the lock is released by the locking cam 38 as shown in Fig. 10 due to carelessness, The latch bolt 44 is retracted in contact with the guide surface of the door catch on the side of the door frame and the push rod 48 provided behind the latch bolt 44 is retracted together with the push rod 48. At this time, The locking cam 38 comes into contact with the guide slope 62 of the locking cam 38 so that the operating rod 16 of the latch cylinder 12 is pushed by the push rod 48 The first and second locking projections 56 and 60 are separated from the retaining grooves 26 and 28 of the inner and outer hubs 30 and 32 so that the lock is released naturally.

The end of the plunger 48 connected to the rear of the latch bolt 44 in the lock releasing operation by the retraction of the latch bolt 44 is connected to the guide passage 14 So that the locking cam 38 is brought into contact with the guide slope 62 of the locking cam 38 in a state in which the linearity is secured by the guide passage 14 in the retracting operation so that the locking cam 38 is slidably moved in the unlocking direction Even if a large impact is applied through the latch bolt 44 when the lock bolt 44 is retracted by the retraction of the latch bolt 44, the plunger 48 and the locking cam 38 are always flexible and smoothly operated without deformation or breakage .

As described above, the present invention is not limited to the above-described embodiments and the accompanying drawings, and various changes, modifications and variations can be made without departing from the technical spirit of the present invention. It will be apparent to those skilled in the art that the present invention is not limited thereto.

(10) - Latch assembly (12) - Latch cylinder
(14) - guide passage (16) - operation chamber
(18) (20) - coupling projections (22) (24) - wings
(26) (28) -engagement grooves (30) (32) - hub
(34) (36) - Latch cam (38) - Locking cam
(40) - Latch Bolt Retractor (42) - Spring
(44) -Latch bolt (46) -Spring
(48) - the plunger (50) - the body
(52) - push rod (54) - connection
(56) - a first locking projection (58) - a slope
(60) - a second locking projection (62) - a guide slope

Claims

The inner and outer hubs 30 and 32 having the vanes 22 and 24 and the engagement grooves 26 and 28 from the inner rear of the latch cylinder 12 and the inner and outer hubs 30 and 32 of the inner and outer hubs 30 and 32 A latch bolt retractor 40 coupled to the vanes 22 and 24 via a latching hole and operated to return by the elasticity of the spring 42, And latching grooves 26 of the inner and outer hubs 30 and 32 are formed in the operation chamber 16 provided at the inner central portion of the latch cylinder 12, The first and second locking projections 56 and 60 facing the locking bolt 28 and the locking cam 38 formed with the guiding sloped surface 62 facing the latch bolt 44 are slidably engaged, The first and second protrusions 56 and 60 are pressed against the inner and outer hubs 30 and 32 when the locking cam 38 is pressed through the push rod 52. [ (28) of the outer hub (32) and the rotation of the outer hub (32) When the latch bolt 44 is retracted in this locked state, the first and second locking projections 56 and 60 of the locking cam 38 are engaged with the engagement grooves of the inner and outer hubs 30 and 32, The latch bolt 44 is configured such that the push rod 48 formed at the rear of the latch bolt 44 is guided by the guide passage 14 formed in front of the operation chamber 16 So as to enter into the chamber (16) and make contact with the guide slope (62) of the locking cam (38).

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