WO2007004756A1

WO2007004756A1 - Door lock device

Info

Publication number: WO2007004756A1
Application number: PCT/KR2005/002108
Authority: WO
Inventors: Kyung-Hwa Oh
Original assignee: Adr Co., Ltd.
Priority date: 2005-07-04
Filing date: 2005-07-04
Publication date: 2007-01-11

Abstract

A door lock device is disclosed, which has a good outer look and is capable of easily setting a locking state at an inner side of a door and easily unlocking the locked state of the door. The door lock device comprises a spindle which passes through the rotation hole of the latch and a center hole of each of the inner and outer bushing with both ends of the spindle being fixed at each of the inner and outer handles for thereby integrally rotating the inner and outer handles; a locking unit which selectively sets a locking state based on a rotation of an operation lever protruded from the inner plate in one direction; and a unlocking unit which unlocks the locked state made by the locking unit.

Description

DOOR LOCK DEVICE

Technical Field

The present invention relates to a door lock device, and in particular to

a door lock device which has a good look with a locked state of a door being

easily u nlocked a t a n i nner s ide of a d oor and w ith a I ocked s tate o f a d oor

being easily unlocked at an outer side of a door without a specific key.

Background Art

Generally, a door lock device is designed so that a locking state can be

selectively set at an inner side of a door if necessary. In the door lock device, a

locked state of a door can be easily unlocked at an inner side of a door, but a

locked state of a door cannot be unlocked at an outer side of a door for thereby

preventing an intrusion of a stranger or an individual privacy.

Figure 1 is a perspective view illustrating a door lock 200 including a

conventional locking device. As shown therein, in the conventional door lock

200, a latch (not shown) is adapted to retard a rotation of an outer handle 220

by rotating a locking dial 211 protruded from a front side of an inner handle 210

in one direction, so that a locking state is set. The locked state is unlocked as

the locking dial 211 is rotated in the reverse direction or a key is inserted into a

keyhole (not shown) formed at the center of an outer handle from an outer side of the door 250 and is rotated.

However, in the conventional door lock device 200, the locking dial 211

is protruded outwards from the inner handle 210, and the keyhole is protruded

forwards from the outer handle 220 resulting in a bad outer look. In particular,

when a locking button is collided, a critical damage to a human body may occur.

In addition, in the conventional door lock device 200, if a user closes the

door 250 at an outer side of the door in a state that the locking state is set, it is

impossible to unlock the locked door at an outer side of the door 250. For

example, in a state that a kid sets the locking state of the door 250, a certain

very emergency situation such as a fire and etc. occurs in the interior of a house,

it is impossible to unlock the locked state of the door at an outer side of the door

without a key, so that the kid may be seriously damaged in the house. More

seriously, the kind may be died.

Furthermore, in the conventional door lock device 200, an engaging

state between the spindle passing through a rotation hole of the latch and the

handles coupled at both ends of the spindle is not reliable. In this case, as the

handles are repeatedly rotated for long time period, the spindle may be

loosened in one direction for thereby causing an error of the latch.

Disclosure of Invention

Accordingly, it is a n o bject of the present i nvention to provide a door

lock device, which has a good outer look and is capable of easily setting a locking state at an inner side of a door and easily unlocking the locked state of

the door. In addition, the locked state can be easily unlocked at an outer side of

the door without a specific key. Errors are significantly decreased in the door

lock device.

To achieve the above objects, there is provided a door lock device in

which an outwardly protruded operation lever of a locking unit is positioned at

the same direction as the extending direction of an inner handle, and the

operation lever is covered by the inner handle when viewing from the front side;

and an outwardly exposed lateral hole of the unlocking unit is formed in the

same direction as the extending direction of the outer handle and is covered by

the outer handle for thereby achieving a good outer look; and the locking state

can be easily set based on a rotation of the operation lever at the inner side of

the door, and the locked state can be easily unlocked; and the locked state can

be unlocked by rotating the i nner h andle; and the l ocked state can be easily

unlocked by simply inserting an insertion part into the lateral hole of the outer

plate at the outer side of the door; and the errors are prevented from occurring

at the latch in such a manner that the spindle and the inner and outer handles

are stably engaged for thereby preventing slip between the spindle and the

inner and outer handles.

Brief Description of Drawings

The present invention will become better understood with reference to the accompanying drawings which are given only by way of illustration and thus

are not limitative of the present invention, wherein;

Figure 1 is a schematic view illustrating a conventional door lock device;

Figure 2 is a schematic perspective view illustrating a door lock device

according to an embodiment of the present invention;

Figure 3 is a disassembled view illustrating a door lock device according

to an embodiment of the present invention;

Figure 4 is a coupled cross sectional view illustrating a spindle and

handles in a door lock device according to an embodiment of the present

invention;

Figure 5 is a partial cross sectional view illustrating a door lock device

according to an embodiment of the present invention;

Figure 6 is a detailed view illustrating a locking unit in a door lock device

according to an embodiment of the present invention;

Figure 7 is a view of an operation when a locking mode is set by a

locking unit in a door lock device according to an embodiment of the present

invention;

Figure 8 i s a d etailed v iew i llustrating a n u nlocking u nit i n a d oor I ock

device according to an embodiment of the present invention;

Figure 9 is a view of an operation when an unlocking mode is set by an

unlocking unit in a door lock device according to an embodiment of the present

invention; and Figure 10 is a view of an unlocking operation when an inner handle is

rotated in a door lock device according to an embodiment of the present

invention.

Best Mode for Carrying Out the Invention

The preferred embodiment of the present invention will be described

with reference to the accompanying drawings.

Figure 2 is a schematic perspective view illustrating a door lock device

according to an embodiment of the present invention, Figure 3 is a

disassembled view illustrating a door lock device according to an embodiment

of the present invention, Figure 4 is a coupled cross sectional view illustrating a

spindle and handles in a door lock device according to an embodiment of the

present invention, and Figure 5 is a p artial c ross sectional view illustrating a

door lock device according to an embodiment of the present invention.

As shown in Figures 2 through 5, the door lock device 1 according to an

embodiment of the present invention includes inner and outer plates 10 and 40

installed at both side surfaces of a door with the inner and outer plates being

coupled, inner and outer handles 20 and 50 rotatably coupled at one side of

each of the inner and outer plates 10 and 40, inner and outer bushings 30 and

60 rotatably fixed at the other side of each of the inner and outer plates 20 and

50, a latch 70 which is fixed at one side of the door and disposed between the

inner and outer plates 10 and 40 and drives a latch bolt in accordance with a rotation of a rotation hole 73, a spindle 80 which passes through a rotation hole

73 of the latch 70 and center holes 33 and 63 of the inner and outer bushings

30 and 60 with both ends being fixed at the inner and outer handles 20 and 50,

respectively, for thereby integrally rotating the inner and outer handles 20 and

50, a locking unit 100 for selectively setting a locking state in accordance with a

rotation of an operation lever 103 protruded from one side of the inner plate 10,

and a unlocking unit 110 for unlocking the locked state locked by the locking unit

100 when a certain insertion unit is inserted into a lateral surface hole 111

formed at one side of the outer plate 40.

Here, the inner plate 10 is supported in a hole formed to help install the

door lock device 1 according to an embodiment of the present invention on an

inner side surface of the door toward the interior of a room so that the inner

handle 20 can be engaged. The inner plate 10 has an engaging shoulder 11 for

an engagement with the inner handle 20 at one side of the same and has an

engaging shoulder 12 for an engagement with the door at the other side of the

same and has a center hole 13 for rotatably fixing the inner bushing at the

center of the same.

On one side surface of the inner plate 10, there are provided a protrusion

14 for rotatably fixing one end of the operation lever 103 of the locking unit 100,

a lateral side hole 15 for a lateral surface extension of the operation lever 103,

and a through hole 16 with a key part 107b of a second cam plate 107 of the

locking unit 100 passing through the through hole 16. A receiving part 17 is formed at the inner plate 10 with a screw hole part

46 of the outer plate 40 being inserted into the receiving part 17 and engaged

using a screw 18, so that the inner plate 10 is coupled with the outer plate 40. A

screw head mounting part 17a is formed at one side of the receiving part 17

with a screw head being mounted on the screw head mounting part 17a. Here,

the receiving part 17 is preferably formed at upper and lower portions.

Two grooves 19 (a few number, but preferably two) are formed at one

side surface of the inner plate 10 with a position fixing part 104 (will be

described later) of the operation lever 103 being received into the two grooves

19.

The inner handle 20 is coupled with one side of the inner plate 10. A user

holds the inner handle 20 for opening the door at the inner side of the door or

rotating the inner handle 20 or pulling or pushing the door. The inner handle 20

has an engaging shoulder 22 engaged with the engaging shoulder 11 of the

inner plate 10 at one side of the same, and a lateral plate 21 having a protrusion

through groove part 23 at the other side of the same with one end of the inner

handle 20 being fixedly inserted into the protrusion through grove part 23 of the

lateral plate 21 , and with one end of the spindle 80 being fixedly inserted into a

fixing groove part 27 formed at one side of the same, and with a handle lever 26

being formed at the other side of the same with the handle lever 26 being

vertically bent from the fixing groove part 27 and being extended in the lateral

direction of the door. The lateral plate 21 is coupled with the handle lever 20 in such a manner

that a screw engaging part 28 is inserted into a through screw hole 23a formed

at the protrusion through groove part 23 of the lateral plate 21 and a through

screw hole 27a formed at the fixing groove part 27 of the handle lever 26.

According to a preferred embodiment of the present invention, in the

inner handle 20, the lateral plate 21 and the handle lever 26 may be integrally

formed, not separately coupled.

The inner bushing 30 is rotatably fixed at the other side of the inner plate

10 through the center hole 13. The inner bushing 30 is rotated with respect to

the inner plate 10 in a state of supporting the spindle 80 in the case that the

spindle 80 passing through the inner bushing 30 is rotated based on an

operation of the inner handle 20.

The inner bushing 30 includes an integral protrusion part 31 inserted into

the center hole 13 of the inner plate 10. A first cam plate 101 of the locking unit

100 is fixedly inserted into the protrusion part 31. A groove 31a is formed on an

outer surface of the protrusion part 31 with a fixing piece 32 being inserted into

the groove 31a for rotatably fixing the inner bushing 30. The protrusion part 31

is preferably formed in a key shape, not in a circular cross section shape, so

that the rotation of the inner bushing 30 is effectively transferred to the first cam

plate 101.

A through hole 33 is formed at the center of the inner bushing 30 with the

spindle 80 passing through the through hole 33. A rotation stopper 35 is formed at one side of the inner bushing 30 for limiting a rotation range of the inner

bushing 30 based on a contact with the upper and lower receiving parts 17 of

the inner plate 10 when the inner bushing 30 is rotated.

The outer plate 40 engaged with the inner plate 10 at a certain distance

is supported in the hole formed to help install the door lock device 1 according

to a preferred embodiment of the present invention on an outer lateral surface

of the door toward the interior of the room so that the outer handle 50 is coupled.

The outer plate 40 includes an engaging shoulder 41 for engaging with the

outer handle 50 at one side of the same, and includes an engaging shoulder 42

for engaging with the door at the other side of the same and includes a center

hole 43 at the center portion of the same for rotatably fixing the outer bushing

60.

A protrusion 44 is formed at one side surface of the outer plate 40 with

the protrusion 44 passing through a center hole 113b of the rotation lever 113 of

the unlocking unit 110 and being rotatably fixed by a fixing piece 114. A through

hole 45 is formed at one side surface of the same with a lateral surface

protrusion part 109a of the key groove part 109 of the locking unit 100 passing

through the through hole 45 and being rotatably fixed. A groove 44a is formed

on an outer surface of the protrusion 44 for mounting the fixing piece 114

therein.

In addition, a screw hole part 46 is formed at the outer plate 40 so that it

is inserted into the receiving part 17 of the inner plate and is engaged by the screw 18 to help engage with the inner plate 10. Here, the screw hole part 46 is

preferably formed at two portions each corresponding to the receiving part 17.

An outer handle 50 is engaged at one side of the outer plate 40. A user

holds the outer handle 50 for opening the door at the outer side of the door or

rotating the handle or pushing or pulling the door. An engaging shoulder 52

engaged with the engaging shoulder 41 of the outer plate 40 is formed at one

side of the outer handle 50. A lateral plate 51 having a protrusion through

groove part 53 is formed at the outer side of the same. One end of the outer

handle 50 is fixedly inserted into the protrusion through groove part 53 of the

lateral plate 51. A fixing groove part 57 is formed at one side of the same with

the other end of the spindle 80 being fixedly inserted into the fixing groove part

57, and a handle lever 56 being formed at the other side of the same and being

vertically bent from the fixing groove part 57 and being extended in the lateral

side direction of the door.

The lateral plate 51 is coupled with the handle lever 56 in such a manner

that a screw engaging part 58 is fixedly inserted into a through screw hole 53a

formed at a protrusion through groove part 53 of the lateral plate 51 and a

through screw hole 57a formed at a fixing groove part 57 of the handle lever 56.

In a preferred embodiment of the present invention, in the outer handle

50, the lateral plate 51 and the handle lever 56 may be integrally formed, not

separately coupled.

The outer bushing 60 is rotatably fixed at the other side of the outer plate 40 through the center hole 43. The outer bushing 60 rotates with respect to the

outer plate 40 in a state of supporting the spindle 80 when the spindle 80

passing through the outer bushing 60 is rotated based on an operation of the

outer handle 50.

A protrusion part 61 is integrally formed at the outer bushing 60 and is

inserted into the center hole 43 of the outer plate 40. A groove 61a is formed at

an outer surface of the protrusion part 61 with a fixing piece 62 being inserted

into the groove 61 for rotatably fixing the outer bushing 60. Here, the protrusion

part 61 preferably has a circular cross section.

A through hole 63 is formed at the center of the outer bushing 60 with the

spindle 80 passing through the through hole 63. A rotation stopper 65 is formed

at one side of the outer bushing 60 for limiting a rotation range of the outer

bushing 60 based on a contact with the upper and lower screw hole parts 46 of

the outer plate 40 when the outer bushing 60 is rotated.

A grove 67 is formed at an outer surface of the outer bushing 60. The

groove 67 is selectively coupled with the lateral surface protrusion part 109c of

the key groove part 109 of the locking unit 100 for thereby locking or unlocking

the outer handle 50.

A latch 70 is fixed at one side of the door and is disposed between the

inner and outer plates 10 and 70. The latch 70 drives a latch bolt protruded in a

direction of one side of the door based on a rotation of the spindle 80 as the

inner and outer plates 20 and 50 are rotated. A support plate 71 is formed at one side of the latch 70 for being fixed at one side of the door. A rotation hole 73

is formed at the body and passes through the spindle 80 and is rotated

integrally with the spindle 80. Here, a through hole 71a is formed at the support

plate 71 with a fixing screw 72 passing through the through hole 71a. Since the

internal construction of the body of the latch 70 is same as the conventional art,

the descriptions of the same will be omitted.

The inner and outer handles 20 and 50 are designed to integrally rotate

by the spindle 80. The spindle 80 passes through the rotation hole 73 of the

latch 70 and the center holes 33 and 63 of the inner and outer bushings 30 and

60 with the both ends of the spindle 8 being fixed at the fixing groove parts 27

and 57 of the inner and outer handles 20 and 50. Here, the spindle 80 is

preferably formed in a polygonal shape, preferably in a bar shape having

rectangular cross sections for thereby integrally rotating the rotation hole 73 of

the latch 70 and the inner and outer bushings 30 and 60 as the inner and outer

handles 20 and 50 are rotated.

In addition, the fixing groove parts 27 and 57 of the inner and outer

handles 20 and 50, the center holes 33 and 63 of the inner and outer bushings

30 and 60 and the rotation hole 73 of the latch 70 have certain cross sections

corresponding to the cross sections of the spindle 80 so that the rotation of one

handle 20 or 50 is transferred to the inner and outer bushings 30 and 60, the

rotation hole 73 of the latch 70 and the other handle 50 or 20.

The both ends of the spindle 80 are surely secured to the inner and outer handles 20 and 50 so that the spindle 80 does not slip with respect to the inner

and outer handles 20 and 50 in order to help prevent the errors in the latch 70

when a relative slip occurs between the inner and outer handles 20 and 50 as

an engaging between the inner and outer handles 20 and 50 is loosened.

As shown in Figures 3 and 4, a certain eccentric hole 81 is formed at

both ends of the spindle 8 in order to help surely secure an engaging between

the inner and outer handles 20 and 50 of the spindle 80. The center portion of

one surface of the both ends of the spindle 80 is made relatively thinner. Fixing

groove parts 27 and 57 and through screw holes 26a and 56a are formed at the

inner and outer handles 20 and 50 with the both ends of the spindle 80 being

inserted into the fixing groove parts 27 and 57 and the through screw holes 26a

and 56a. The screw engaging parts 29 and 59 are inserted into the through

screw h oles 26a and 56a of t he i nner and outer h andles 20 a nd 50 a nd are

extended into the center portion of one side surface of each of the both ends of

the spindle 80 for thereby surely securing the spindle 80 and the inner and outer

handles 20 and 50.

In other words, one end of the spindle 80 is coupled into the inner handle

20 in such a manner that the screw engaging part 29 is inserted into the through

screw hole 26a formed at the inner handle 20 with an end of the same being

inserted i nto the center portion of one side s urface of the end of the s pindle

having a relatively thinner thickness formed by the eccentric hole 81. The other

end of the spindle 80 is coupled into the outer handle 50 in such a manner that the screw engaging part 59 is inserted into the through screw hole 56a formed

at the outer handle 50 with the end of the same being inserted into the center

portion of one side surface of the other end of the spindle 80 having a relatively

thinner thickness formed by the eccentric hole 81.

In order to achieve the above construction, one side surface of the

spindle 80 should be opposite with respect to the through screw holes 26a and

56a formed at the inner and outer handles 20 and 50.

A locking unit 100 is provided at the inner and outer plates 10 and 40,

respectively, for selectively setting the locking state of the outer handle 50.

Figure 6 is a view illustrating the locking unit 100.

As shown in Figure 6, the locking unit 100 includes a first cam plate 101

fixed at a protrusion part 31 of the inner bushing 30 for locking or unlocking the

outer handle 50 based on an operation of the operation lever 103; an operation

lever 10 of which an end is rotatably fixed at the inner plate 10, and the other

end is protruded from the inner plate 10 in a certain direction; a fixture 104 that

is i nstalled at the i nner p late 1 0 for fixing a rotation position of the operation

lever 103; a second cam plate 107 that is selectively engaged with the first cam

plate 101 based on a rotation of the operation lever 103 with a key part 107b,

that passes through the inner plate 10 and is extended toward the outer plate

40, being integrally formed with the second cam plate 107; and a key groove

part 109 that is engaged with the key part 107b of the second cam plate 107

and is rotatably fixed at the outer plate 40 and is connected with the unlocking unit 110, with a lateral surface protrusion part 109c selectively supporting a

rotation of the outer bushing 60 based on a rotation of the operation lever 103

being integrally formed with the key groove part 109. Here, the locking unit 100

further preferably includes a connection lever 105 of which both ends are

rotatably connected with the operation lever 103 and the second cam plate 107.

The first cam plate 101 is inserted into the protrusion part 31 of the inner

bushing 30 and is fixed by the fixing piece 32 and is rotated based on an

operation of the inner bushing 30 and is selectively engaged with the second

cam plate 107. A through hole 101a is formed at the center of the first cam plate

101 for thereby being inserted onto the protrusion 31 of the inner bushing 30. A

cross section expansion part 101 b is formed at an outer surface of the same

and forms a cam selectively engaged with the second cam plate 107.

The first cam plate 101 is engaged with the inner bushing 30 through a

key-shaped through hole 101a and is integrally rotated with the inner bushing

30 when the inner handle 20 is rotated.

As the user rotates the operation lever in a clockwise direction or a

counterclockwise direction, the operation lever 103 sets a locking state or

unlocks the locked state at the outer handle 50. A through hole 103a is formed

at one end of the operation lever 103 and is inserted onto the protrusion 14 of

the inner plate 10 for thereby being rotatably fixed by the fixing piece 104. A

protrusion 103b is formed at the center of the operation lever 103 and is

inserted into the through hole 105a formed at an end of a connection rod 105 for thereby rotatably fixed by a fixing piece 106. The other end of the operation

lever 103 is protruded from one side through a hole 15 formed at one side of the

inner plate 10. In addition, a groove is formed at the protrusion 103b for

mounting the fixing piece 106 therein.

Here, the operation lever 103 is protruded from the inner plate 10 in the

same direction as the extending direction of the inner handle 20. When viewing

it from the front side, it is preferably covered by the inner handle 20. With the

above constructions, the door lock 1 according to an embodiment of the present

invention has a good design and a good outer look.

A groove 103c is formed at a back surface of the operation lever 103.

The groove 103c is selectively engaged with the position fixing part 104 for

thereby fixing a locking set position and an unlocking set position of the

operation lever 103.

The position fixing part 104 capable of fixing the upper and lower

positions of the operation lever 1034 includes a plurality of elastic protrusions

that are provided in the groove 19 formed at one side surface of the inner plate

10 and are selectively engaged into the groove 103c of the back surface of the

operation lever 103. The above elastic protrusions are preferably formed of

elastic springs fixed in the groove 19, and spherical members supported by the

elastic springs.

The connection lever 105 is rotatably connected with the protrusion

103b of the operation member 103. The force applied to the operation lever 103 is transferred to the second cam plate 107. The protrusion 103b of the operation

lever 103 is inserted into an end of the connection lever 105. For example, there

are provided a through hole 105a rotatably fixed by the fixing piece 106, and a

through hole 105b rotatably fixed by the fixing piece 108 with the protrusion

107a formed at the second cam plate 107 being inserted into the through hole

105b. Here, the connection lever 105 is preferably formed in a circularly bent

shape.

The second cam plate 107 is rotatably connected at the other end of the

connection lever 105. The second cam plate 107 is selectively engaged with the

first cam plate 101 based on an operation of the operation lever 103. The

protrusion 107a is formed at one side of the second cam plate 107 with the

protrusion 107a being rotatably fixed by the fixing piece 108 in cooperation with

an insertion of the through hole 105b of the connection lever 105. A key part

107b is integrally formed at the other side of the second cam plate 107 with the

key part 107b being engaged with the key groove 109a of the key groove part

109 through the through hole 16 of the inner plate 10.

The key groove part 109 is engaged with the key part 107b of the

second cam plate 107 and is rotatably fixed at the outer plate 40. Here, the key

groove part 109 determines a rotation state of the outer bushing 60 with respect

to the rotation of the operation lever 103 for thereby locking or unlocking the

outer handle 50. The key groove 109a is formed at one side of the key groove

part 109 with the key part 107b of the second cam plate 107 being inserted into the key groove 109a, and an engaging part 109b is formed at the other side of

the same and is inserted into the through hole 45 of the outer plate 40 and is

rotatably fixed by the fixing piece 109e.

A lateral protrusion part 109c is integrally formed at the key groove part

109. The lateral protrusion part 109c is selectively inserted into a groove 67

formed at an outer surface of the outer bushing 60 based on a rotation direction

of the operation lever 103 for thereby limiting the rotation of the outer bushing

60. The lateral protrusion part 109c is formed with an acute angle so that the

lateral protrusion part 109c is not pushed out by a rotation force of the outer

bushing 60.

In this case, the direction of the force applied to the lateral protrusion

part 109c by the groove 67 of the outer bushing 60 is the same as the direction

of the center line of the key groove part 109 rotatably fixed at the outer plate 40,

so that the operation line of the force is parallel with the center line of the key

groove part 109. Therefore, even when force is applied to the lateral protrusion

part 109c by the groove 67 of the outer bushing 60, the key groove part 109

does not rotate, so that the lateral protrusion part 109c remains in the groove 67

for thereby limiting the rotation of the outer handle 50.

A protrusion 109d engaged with an upper side of the rotation lever 113

of the unlocking unit 110 is formed at the lateral protrusion part 109c.

Figure 7 is a view of an operation when the locking mode is set by the

locking unit 100 in the door lock device 1 according to an embodiment of the present invention. The operation of the locking unit 100 will be described with

reference to Figure 7.

As shown in Figure 7, the protrusion 107a is positioned at the left side

with respect to the centerline of the second cam plate 107. When the operation

lever 103 is rotated in the counterclockwise direction, the locking mode is

activated, and when it is rotated in the clockwise direction, the unlocked state is

unlocked.

When the operation lever 103 is rotated in the counterclockwise

direction, the connection l ever 1 05 connected with the o peration lever 1 03 is

moved along the slightly slanted line. As the connection lever 105 is moved, the

second cam plate 107 is rotated in the clockwise direction with respect to the

key part 107b and is moved into a rotation radius range of the first cam plate

101 for thereby being engaged with the first cam plate 101. In this case, the key

groove part 109 rotatably connected with the key part 107b of the second cam

plate 107 is rotated in the clockwise direction on the outer plate 40. The lateral

protrusion part 109c integrally formed at the key groove part 109 is inserted into

the groove 67 formed at an outer surface of the outer bushing 60 for thereby

limiting the rotation of the outer bushing 60, so that the locked state is achieved.

On the contrary, when the operation lever 103 is rotated in the

clockwise direction, the connection lever 105 connected with the operation lever

103 is moved along the slightly slanted line. As the connection lever 105 is

moved, the second cam plate 107 is rotated in the counterclockwise direction with respect to the key part 107b and is escaped from the rotation radius range

of the first cam plate 101 , so that the inner bushing 30 can be rotated. At the

same time, the key groove part 109 rotatably connected with the key part 107b

of the second cam plate 107 is rotated in the counterclockwise direction on the

outer plate 40. The lateral protrusion part 109c integrally formed at the key

groove part 109 is escaped from the groove 67 formed at an outer surface of

the outer bushing 60, so that the outer bushing 60 can be rotated, and the

locked state is unlocked.

On the contrary, in the case that the protrusion 107a is positioned at the

right side with respect to the centerline of the second cam plate 107, the locking

unit 100 becomes a locked state as the operation lever 103 is rotated in the

clockwise direction and becomes a unlocked state as the operation lever 103 is

rotated in the counterclockwise direction. In the above operation descriptions,

only the operations of the operation lever 103 and the connection lever 105 are

different. The other operations are same.

An unlocking unit 110 is provided at the outer plate 40 for unlocking the

locked state by the locking unit 100 when a thin and long insertion unit is

inserted into the lateral hole 111 formed at one side of the outer plate 40 as the

unlocking unit 110 is connected with the key groove part 109 of the locking unit

100. Figure 8 is a detailed view of the unlocking unit 110.

As shown in Figure 8, the unlocking unit 110 includes a lateral hole 111

formed at one side of the outer plate 40, and a rotation lever 113 for rotating the key groove part 109 in the unlocking direction when force is applied downwards

as the insertion unit is inserted into the lateral hole 111.

Here, the lateral hole 111 is formed in the same direction as the

extending direction of the outer handle 50 at one side of the outer plate 40.

When viewing from the front direction, it is preferably covered by the outer

handle 50. With the above constructions, the door lock 1 according to an

embodiment of the present invention has a good outer look and a good design.

A through hole 113a is formed at the center of the rotation lever 113,

with the protrusion 44 of the outer plate 40 being inserted into the through hole

113a and being rotatable by a fixing piece 114. An engaging part 113b is formed

at the upper side of the rotation lever 113 and is engaged with the protrusion

109d formed at the lateral protrusion part 109c of the key groove part 109. A

vertical plate 113c is formed at a lower side of the rotation lever 113 at the same

plane as the lateral hole 111.

A position fixture capable of fixing the position of the lateral protrusion

part 109c of the key groove part 109 is preferably formed at the outer plate 40

like the constructions of the position fixing part 104 of the operation lever 103

formed at the inner plate 10.

Figure 9 is a view illustrating an operation in the unlocking mode by

the unlocking unit 110 in the door lock device 100 according to a preferred

embodiment of the present invention. As shown in Figure 9, the unlocking

operation of the unlocking unit 110 will be described. In the following descriptions, the protrusion 107a is positioned at the left side with respect to the

centerline of the second cam plate 107.

In the locked state by the locking unit 100, a thin and long insertion unit

is inserted through the lateral hole 111 for pushing the vertical plate 113c of the

rotation lever 113, so that the rotation lever 113 is rotated in the clockwise

direction with respect to the through hole 113a, and the engaging part 113b

formed at the other end of the rotation lever 113 is rotated in the clockwise

direction. At the same time, the key groove part 109 is rotated in the

counterclockwise direction on the outer plate 40 by applying force to the lateral

protrusion part 109c of the key groove part 109. With the above operation, the

lateral protrusion part 109c of the key groove part 109 is escaped from the

groove 67 formed at an outer surface of the outer bushing 60, so that the outer

bushing 60 can be rotated for thereby unlocking the locked state.

In this case, the second cam plate 107 is rotated in the

counterclockwise direction by the key part 107b rotatably connected at the key

groove part 109 and is escaped from the rotation radius range of the first cam

plate 101 , so that the operation lever 103 is returned to the unlocking position.

In the case that the protrusion 107a is positioned at the right side with

respect to the centerline of the second cam plate 107, only the operations of the

operation lever 103 and the connection lever 105 are different. The other

remaining operations are all same.

In the door lock device 1 according to an embodiment of the present invention, the locked state by the locking unit 100 is preferably unlocked based

on a rotation operation of the inner handle 20. Figure 10 is a view illustrating an

unlocking operation when the inner handle 20 is rotated. The unlocking

operation based on a rotation of the inner handle 20 will be described with

reference to Figure 10.

In the case that the locking state is set by the locking unit 100, the inner

handle 20 is rotated in the clockwise direction. The rotational force is applied to

the inner bushing 30 and the first cam plate 101 fixed at the protrusion part 31

of the inner bushing 30 through the spindle 80 of which one end is fixed at the

inner handle 20. The force transferred to the first cam plate 101 is transferred to

the second cam plate 107 engaged with the first cam plate 101. The force

transferred to the second cam plate 107 is applied to help rotate the operation

lever 103 through the connection lever 105 in the unlocking direction. Since the

force transferred to the second cam plate 107 is relatively larger than the elastic

force of the position fixing part 104, the operation lever 103 overcomes the

elastic force of the position fixing part 104, so that the locked state by the

locking unit 100 is unlocked.

Industrial Applicability

As described above, in the door lock device according to the present

invention, when viewing from the front side of the same, the operation lever and the lateral hole are covered by other elements, so that an outer look is good. In

addition, it is possible to unlock the locked state by simply inserting a certain

insertion unit into the lateral hole at the inner side of the door as well as the

outer side of the door without using a specific key. In particular, in the case that

a certain emergency accident occurs in the interior of a kid's room with a door

being locked, it is possible to quickly measure the accident and to save the life

of the kid. The spindle and the inner and outer handles are surely coupled

without any slip between the spindle and the inner and outer handles, so that it

is possible to basically prevent any errors of the latch.

As the present invention may be embodied in several forms without

departing from t he s pirit o r e ssential c haracteristics t hereof, i t s hould also be

understood that the above-described examples are not limited by any of the

details of the foregoing description, unless otherwise specified, but rather

should be construed broadly within its spirit and scope as defined in the

appended c laims, a nd t herefore a Il c hanges a nd m odifications t hat fall w ithin

the meets and bounds of the claims, or equivalences of such meets and bounds

are therefore intended to be embraced by the appended claims.

Claims

Claims:

1. A door lock device, comprising:

an inner plate and an outer plate which are installed at both sides of a

door in an engaged state;

an inner handle and an outer handle which each are rotatably engaged

at one side of each of the inner and outer plates;

an inner bushing and an outer bushing which each are rotatably fixed at

the other side of each of the inner and outer plates;

a latch which is fixed at one side of the door and is disposed between

the inner and outer plates and drives a latch bolt based on a rotation of a

rotation hole;

a spindle which passes through the rotation hole of the latch and a

center hole of each of the inner and outer bushing with both ends of the spindle

being fixed at each of the inner and outer handles for thereby integrally rotating

the inner and outer handles;

a locking means which selectively sets a locking state based on a

rotation of a n o peration I ever p rotruded from t he i nner p late i n one d irection;

and

a unlocking means which unlocks the locked state made by the locking

means when a certain insertion means is pushed into a lateral hole formed at

one side of the outer plate.

2. The device of claim 1 , wherein the both ends of said spindle are stably

fixed at the inner and outer handles, respectively, for preventing a slip with

respect the inner and outer handles.

3. The device of claim 2, wherein an eccentric hole is formed at the both

ends of the spindle, with a center portion of one side surface of each of both

ends being relatively thinner, and with a fixing groove part and a screw through

hole being formed at each of the inner and outer handles with the both ends of

the spindle passing through the fixing groove part and the screw through hole,

and with a screw engaging part being inserted into the screw through hole of

each of the inner and outer handles and being extended into a center portion of

one side surface of each of the both ends of the spindle for thereby stably

engaging the spindle and the inner and outer handles, respectively.

4. The device of claim 1 , wherein said locking means includes:

a first cam plate which is fixed at a protrusion part of the inner bushing;

an operation lever of which one end is rotatably fixed at the inner plate,

and the other end is protruded from the inner plate in one direction;

a position fixing part which is installed at the inner plate for thereby

fixing a rotation position of the operation lever;

a second cam plate which is selectively engaged with the first cam plate

based on a rotation of the operation lever and includes an integral key part passing through the inner plate and being extended toward the outer plate; and

a key groove part which is engaged with a key part of the second cam

plate a nd is rotatably fixed at the outer plate and includes an integral lateral

protrusion part for selectively limiting a rotation of the outer bushing based on a

rotation of the operation lever and is connected with the unlocking means.

5. The device of claim 4, further comprising:

a connection lever of which both ends are rotatably connected with the

operation lever and the second cam plate.

6. The device of claim 4, wherein said first cam plate is engaged with a

protrusion part of the inner bushing through a key shaped through hole for

thereby integrally rotating with the inner bushing when the inner handle is

rotated.

7. The device of claim 4, wherein said operation lever is protruded in the

same axial direction as the inner handle and is covered by the inner handle

when being viewed from the front side.

8. The device of claim 4, wherein said position fixing part is disposed in

the groove formed at one surface of the inner plate and is formed of a plurality

of elastic protrusions being selectively engaged with the groove formed at a back surface of the operation lever.

9. The device of claim 4, wherein in the locking mode, the lateral

protrusion part integrally formed at the key groove part of the locking device is

inserted i nto and e ngaged w ith t he g roove formed at a n o uter s urface of t he

outer bushing for thereby limiting a rotation of the outer handle, and in the

unlocking mode, the lateral protrusion part is escaped from the groove, so that

the outer handle can be freely rotated.

10. The device of claim 9, wherein said lateral protrusion part is bent at an

acute angle so that the lateral protrusion part is not escaped from the groove by

a rotational force of the outer bushing applied to the outer handle in the locking

mode.

11. The device of claim 4, wherein said unlocking means includes:

a lateral hole formed at one side of the outer plate; and

a rotation lever for rotating the key groove part of the locking means in

the unlocking direction when force is applied downwards by an insertion means

inserted through the lateral hole.

12. The device of claim 11 , wherein said lateral hole is formed at one side

of the outer plate in the same direction as the extended direction of the outer handle and is covered by the outer handle when being viewed from the front

side.

13. The device of claim 11 , wherein said rotation lever includes a center

portion, an upper end and a lower end, with a through hole being formed at the

center portion of the rotation lever with the protrusion of the outer plate being

inserted into the through hole, and with an engaging part engaged with the

protrusion formed at the lateral protrusion part of the key groove part being

formed at the upper end of the rotation lever, and with a vertical plate positioned

at the same plane as the lateral hole being formed at the lower end of the

rotation lever.

14. The device of claim 1 , wherein said locked state by the locking means is

unlocked based on a rotation operation of the inner handle.