CN108353142B

CN108353142B - Device for adjusting position of display using chain

Info

Publication number: CN108353142B
Application number: CN201680066906.0A
Authority: CN
Inventors: 姜泰旭
Original assignee: Top System Co Ltd
Current assignee: Top System Co Ltd
Priority date: 2015-11-09
Filing date: 2016-11-01
Publication date: 2020-10-30
Anticipated expiration: 2036-11-01
Also published as: WO2017082571A1; CN108353142A; KR101600925B1

Abstract

The present invention relates to an apparatus for adjusting a position of a display using a chain, and more particularly, to an apparatus for adjusting a position of a display using a chain, which includes: wherein when the device mounted with the display performs the lifting movement, the lifting movement can be performed more smoothly using a chain.

Description

Device for adjusting position of display using chain

Technical Field

The present invention relates to an apparatus for adjusting a position of a display using a chain, and more particularly, to a display position adjusting apparatus configured to smoothly perform lifting and lowering operations by using a chain in a state in which a display is mounted on the display position adjusting apparatus.

Background

People watch television for entertainment and as an activity to obtain information. However, watching television in a fixed posture for a long time may cause discomfort to the viewer and cause diseases such as scapulohumeral periarthritis, back pain, spondylopathy, or sciatica.

Many efforts have been made to solve these problems and to enable people to comfortably enjoy rich, diversified television programs.

For this reason, recently, there is a demand for a display position adjusting apparatus capable of remotely or manually adjusting the height and angle of a television according to the visual field of a viewer in a lying or sitting posture so as to place the television at a viewing angle optimized for comfortably watching television, and being used for therapeutic purposes for persons having the above-mentioned diseases or patients lying on hospital beds.

The inventor has obtained korean patent No. 10-0521359, entitled "television set position control apparatus" and shown in fig. 32 to 35.

The television position control apparatus is configured to move the television to a desired height according to the horizon of the viewer, which varies with the posture of the viewer, and adjust the angle of the television so as to watch at an appropriate angle. The television position control device comprises: a frame 10 having a large length extending vertically along the wall 1; a movable block 20 supported on the frame 10 and vertically movable along the frame 10; a television 50 fixed to the movable block 20; a lifting unit configured to lift and lower the movable block with respect to the frame 10; and an angle adjusting unit configured to adjust an angle of the television 50 with respect to the movable block 20.

The lifting unit includes: a screw shaft 11 having a vertically large length and rotatably supported on the frame 10, the movable block 20 being screw-coupled to the screw shaft 11;

guide rods

12 and 13 supported on the frame 10 in parallel to the screw shaft 11, a movable block 20 slidably coupled to the

guide rods

12 and 13; and a drive motor configured to rotate the screw shaft 11.

The rear lower portion of the television 50 and the corresponding lower portion of the movable block 20 are rotatably connected to each other using hinges 51 and 21. The angle adjustment unit includes: a rotation center body 30 configured to be rotated by a rotation motor 60 provided on an upper portion of the movable block 20, the rotation center body 30 including a vertical protrusion 31 on one end thereof; a link member 32 having one end rotatably coupled to an end portion of the vertical protrusion 31; and a lever member 33 having one end rotatably coupled to the other end of the link member 32 and the other end fixed to an upper portion of the television 50.

The television position control means can be remotely controlled to move the television 50 to a desired height according to the viewer's eye level by operating the screw drive motor and the rotation motor 60 in the forward and reverse directions and to adjust the angle of the television 50 so as to be viewed at an appropriate angle.

However, the screw shaft 11 of the television set position control apparatus is exposed to the outside, and therefore, oil (e.g., grease) applied to the screw shaft 11 may be quickly contaminated by foreign substances such as dust due to static electricity caused by the television set 50. Therefore, the lifting and lowering operations may not be smoothly performed, and frequent cleaning may be required.

Disclosure of Invention

Technical problem

To solve the above problems, the present invention provides an apparatus for adjusting the position of a display using a chain. In the apparatus for adjusting the position of the display using the chain, the chain is vertically disposed on both sides of the support frame, and the bracket is coupled to the chain to lift or lower the bracket along the chain by rotating the chain, thereby ensuring smooth lifting and lowering operations and reducing troubles caused by substances such as dust.

Solution to the problem

To solve the above problems, the present invention provides an apparatus for adjusting a position of a display using a chain, the apparatus comprising: a base; a pair of support frames disposed in a vertically parallel manner on left and right sides of an upper surface of the base; a bracket slidably coupled between the support frames to be lifted and lowered along the support frames; a main link rotatably coupled to the bracket in a vertical direction, a display being disposed on a front end of the main link; a lifting unit configured to lift and lower the bracket and the main link along the support frame; and a housing including a front surface in which an elongated hole is formed and a lower end fixed to the base, the main link protruding through the elongated hole and being slidable in the elongated hole, wherein the lifting unit includes: a driving shaft provided on a lower portion of the support frame and protruding from both sides of the support frame; a pair of driving sprockets provided on both ends of the driving shaft; a pair of driven sprockets corresponding to the driving sprockets and disposed on an upper outer side of the support frame; a pair of chains disposed around the drive sprocket and the driven sprocket, the bracket being coupled to sides of the chains; and a first motor disposed between the support frames to rotate the driving shaft.

In addition, each of the support frames may have an opening with a rearward opening

A square cross section, wherein first guide rollers may be disposed on left and right front sides of the bracket and vertically spaced from each other to rotate with outer circumferential surfaces of the first guide rollers contacting front surfaces of the support frame, and second guide rollers may be disposed on left and right rear sides of the bracket and vertically spaced from each other, the second guide rollers being configured on rear sides of the support frame, wherein each of the second guide rollers may include: a first roller portion having a front surface contacting an end portion of the opening of the support frame; and a second roller portion protruding in a stepped shape from the front surface of the first roller portion to rotate with an outer circumferential surface of the second roller portion contacting an inner surface of the opening, the first roller portion being formed integrally with the second roller portion, wherein when the carriage is lifted or lowered by the lifting unit, the first guide roller may rotate with the outer circumferential surface thereof contacting the front surface of the support frame, and the second guide roller may rotate with the front surface of the first roller portion contacting the end portion of the opening of the support frame and the outer circumferential surface of the second roller portion contacting the inner surface of the opening of the support frame, such that the first guide roller and the second guide roller are supported by the support frame, respectivelyThe first guide roller and the second guide roller may prevent the bracket from swinging.

In addition, a support may protrude forward from the bracket, and the main link may be rotatably hinged on the support using a first hinge to move like a seesaw, wherein the apparatus may further comprise: an angle adjusting unit provided on the bracket to move the main link like a seesaw by means of the first hinge; and a balancing member provided on a rear end of the main link to balance with a weight of the display.

In addition, the angle adjusting unit may include: a first rack gear having a fan shape and disposed on a rear side of the main link; a first pinion gear provided on the carriage in meshing engagement with the first rack gear; and a second motor provided on the bracket to rotate the first pinion, wherein when the second motor rotates, the main link may move like a seesaw by means of the first hinge through the first pinion and the first rack gear, so that a viewing angle of the display may be adjusted.

In addition, the balance member may include: a weight part including a guide hole vertically formed therethrough, the weight part being placed at a rear lower side of the bracket; a guide bar including a lower end portion placed on the base and an upper end portion placed on the housing, the guide bar being inserted into the guide hole to guide the weight member; a connection rope including one end coupled with the rear end of the main link and the other end coupled with an upper portion of the weight part; and a guide roller provided on the bracket and guiding the connection rope, wherein the guide roller can guide the connection rope so that the weight member can be prevented from swinging back and forth when the weight member moves vertically due to the angle adjustment of the main link by using the angle adjustment unit, wherein the guide bar can guide the weight member in a vertical direction when the weight member is lifted or lowered by the lifting unit.

In addition, a mounting hole may be formed in each of the left and right sides of the housing to place a speaker therein, and the device may further include a speaker exposing unit configured to retract the speaker into the housing or extend the speaker outward from the housing.

In addition, the speaker exposing unit may include: a slidable member movable into and out of the housing through the mounting hole, the speaker being placed on the slidable member, the slidable member including a guide groove and a second rack gear; a fixed plate fixed to the housing, the fixed plate including a guide protrusion configured to slide in the guide groove and a second pinion gear engaged with the second rack gear; and a third motor provided on the fixed plate to rotate the second pinion, wherein when the third motor is operated, the second pinion may interact with the second rack gear such that the slidable member on which the speaker is placed may be moved into and out of the housing through the mounting hole.

In addition, the slidable member may include: a guide rail installation groove opened toward the housing, the second rack gear and the guide groove being disposed in the guide rail installation groove; a speaker mounting groove formed at one side of the rail mounting groove to place the speaker therein; and a plurality of covers provided on upper and lower surfaces of the slidable member to close upper and lower sides of the rail mounting groove and the speaker mounting groove, wherein the mounting hole is closable by a front side, a rear side, and a lateral side of the slidable member and the cover when the slidable member protrudes outward from the housing, and the mounting hole is closable by the lateral side of the slidable member when the slidable member is retracted into the housing.

Additionally, the speaker may be vertically slid into and coupled to the speaker mounting recess.

In addition, the speaker exposing unit may include: a rotatable member hinged on the housing to open and close the mounting hole, the speaker being placed on the rotatable member; a driven gear provided on the hinge coupling portion of the rotatable member; a drive gear provided on the housing in mesh with the driven gear; and a fourth motor provided on the housing to rotate the driving gear, wherein when the fourth motor is operated, the rotatable member is rotatable so that the speaker placed on the rotatable member can enter or protrude outward from the housing through the mounting hole.

Additionally, the rotatable member may include: a first block plate in which a speaker mounting groove is formed to place the speaker in the speaker mounting groove, the first block plate being configured to close the mounting hole when the speaker is moved into the housing; a second body plate configured to close the mounting hole when the speaker protrudes outward from the housing; and a hinge shaft placed at upper and lower surfaces where the first and second block plates contact each other, the hinge shaft being hinged on the upper and lower surfaces of the housing behind the mounting hole, wherein the first block plate may close the mounting hole when the speaker is placed in the housing through the mounting hole as the rotatable member rotates by means of the hinge shaft, and the second block plate may close the mounting hole when the speaker protrudes outward from the housing through the mounting hole as the rotatable member rotates by means of the hinge shaft.

In addition, the speaker may be vertically slid into and coupled to the speaker mounting groove, and a plurality of covers may be fixed to upper and lower sides of the speaker mounting groove to prevent the speaker from being detached.

In addition, the apparatus may further include: a sensor unit configured to detect whether the display is turned on or off; and a control unit configured to control the third motor or the fourth motor according to a signal of the sensor unit, wherein the control unit may control the third motor or the fourth motor to expose the speaker to the outside of the housing according to a signal of the sensor unit indicating that the display is turned on, and may control the third motor or the fourth motor to retract the speaker into the housing according to a signal of the sensor unit indicating that the display is turned off.

Drawings

Fig. 1 is a perspective view showing a configuration according to an embodiment of the present invention.

Fig. 2 and 3 are a side perspective view and another side perspective view showing a configuration according to an embodiment of the present invention, in which a housing is not shown.

Fig. 4 and 5 are a side perspective view and another side perspective view illustrating a lifting unit and a bracket according to an embodiment of the present invention.

Fig. 6 is a plan view showing the configuration of a bracket according to an embodiment of the present invention.

Fig. 7 and 8 are a side perspective view and another side perspective view illustrating a bracket, a main link, an angle adjusting unit, and a balancing member according to an embodiment of the present invention.

Fig. 9 is a side view illustrating a bracket, a main link, an angle adjusting unit, and a balancing member according to an embodiment of the present invention.

Fig. 10 is a perspective view illustrating a slidable member extended outward using a speaker exposing unit by a first method according to an embodiment of the present invention.

Fig. 11 is a perspective view illustrating a slidable member retracted using a speaker exposing unit by a first method according to an embodiment of the present invention.

Fig. 12A and 12B are perspective views illustrating a speaker exposing unit for a first method according to an embodiment of the present invention.

Fig. 13 and 14 are exploded perspective views illustrating a speaker exposing unit for a first method according to an embodiment of the present invention.

Fig. 15A and 15B are plan views illustrating how the speaker exposing unit is operated by the first method according to the embodiment of the present invention.

Fig. 16 is a perspective view illustrating a slidable member extended outward using a speaker exposing unit by a second method according to an embodiment of the present invention.

Fig. 17 is a perspective view illustrating a slidable member retracted using a speaker exposing unit by a second method according to an embodiment of the present invention.

Fig. 18 is a perspective view illustrating one of speaker exposing units for a second method according to an embodiment of the present invention.

Fig. 19 is an exploded perspective view illustrating a speaker exposing unit for a second method according to an embodiment of the present invention.

Fig. 20A and 20B are plan views illustrating how the speaker exposing unit is operated by the second method according to the embodiment of the present invention.

Fig. 21 is a perspective view illustrating a slidable member extended outward using a speaker exposing unit by a third method according to an embodiment of the present invention.

Fig. 22 is a perspective view illustrating a slidable member retracted using a speaker exposing unit by a third method according to an embodiment of the present invention.

Fig. 23A and 23B are perspective views illustrating a speaker exposing unit for a third method according to an embodiment of the present invention.

Fig. 24 and 25 are exploded perspective views illustrating a speaker exposing unit for a third method according to an embodiment of the present invention.

Fig. 26A and 26B are plan views illustrating how the speaker exposing unit is operated by the third method according to the embodiment of the present invention.

Fig. 27 is a perspective view illustrating a rotatable member extended outward using a speaker exposing unit by a fourth method according to an embodiment of the present invention.

Fig. 28 is a perspective view illustrating a rotatable member retracted using a speaker exposing unit by a fourth method according to an embodiment of the present invention.

Fig. 29 is a perspective view illustrating one of speaker exposing units for a fourth method according to an embodiment of the present invention.

Fig. 30 is an exploded perspective view illustrating one of speaker exposing units for a fourth method according to an embodiment of the present invention.

Fig. 31A and 31B are plan views illustrating how the speaker exposing unit is operated by the fourth method according to the embodiment of the present invention.

Fig. 32 is a conceptual diagram illustrating a related art display lifting device.

Fig. 33 is a perspective view illustrating the main driving assembly shown in fig. 32.

Fig. 34 and 35 are operation diagrams illustrating an angle adjustment operation.

Detailed Description

According to an embodiment of the present invention, an apparatus for adjusting a position of a display using a chain is configured by: the chain is vertically placed on both sides of the support frame, and the bracket is coupled to the chain to lift or lower the bracket along the chain by rotating the chain, thereby ensuring relatively smooth lifting and lowering operations and reducing troubles caused by dust and the like.

As shown in fig. 1 to 31B, the apparatus for adjusting the position of a display using a chain according to an embodiment of the present invention includes a base 110, a support frame 200, a bracket 300, a main link 400, an angle adjusting unit 500, a balance member 600, a lifting unit 700, a housing 100, a shield (not shown), and a

speaker exposing unit

800, 900, 80, or 90.

The base 110 is configured to be supported on a floor as shown in fig. 1 so that the device of the present invention using a chain to adjust the position of a display can stand on the ground or the like.

In the present embodiment, the base 110 is positioned on a lower portion of the housing 100 and supported on the ground or the like. However, the base 110 may be disposed on the rear side of the case 100 and placed on a wall or the like.

As shown in fig. 1, a base 110 is coupled to a lower end of a housing 100 (to be described later).

This will be explained in detail later.

A pair of support frames 200 are provided, which are disposed in parallel with each other in the vertical direction on the left and right sides on the upper surface of the base 110.

That is, as shown in fig. 2 to 5, the support frames 200 are spaced apart from each other by a constant distance and are positioned perpendicular to the upper surface of the base 110.

As described later, the support frame 200 is coupled to the lifting unit 700 to support the vertical movement of the carriage 300.

To this end, as shown in fig. 6, each of the support frames 200 has an opening 201 with an opening opened rearward

A cross section is formed.

This will be explained in detail later.

The bracket 300 is slidably coupled between the support frames 200 to be lifted and lowered along the support frames 200.

The bracket 300 is provided with a support 310, a first guide roller 320 and a second guide roller 330.

As shown in fig. 2, 7 and 9, the supports 310 are coupled in such a manner that the main link 400 can move like a seesaw by means of the first hinge 311.

As shown in fig. 2, 4 and 6, the first guide rollers 320 are disposed on the left and right front sides of the carriage 300 and are vertically spaced apart from each other.

When the carriage 300 slides along the support frame 200, the first guide roller 320 rotates with its outer circumference contacting the front surface of the support frame 200, thereby preventing the carriage 300 from swinging backward and ensuring smooth sliding of the carriage 300.

The second guide rollers 330 are disposed on the left and right rear sides of the carriage 300 and are vertically spaced apart from each other, i.e., on the rear side of the support frame 200.

That is, the first and

second guide rollers

320 and 330 are provided to support the front and rear surfaces of the support frame 200, and thus, the carriage 300 can be smoothly raised and lowered in the vertical direction along the support frame 200.

In this case, as shown in fig. 6, each of the second guide rollers 330 includes a first roller portion 331 and a second roller portion 332 that are formed as one body.

The front surface of the first roller portion 331 contacts the end portion of the opening 201 of the support frame 200.

When the carriage 300 is lifted or lowered, the first roller portion 331 and the first guide roller 320 contact the rear surface and the front surface of the support frame 200, thereby preventing the carriage 300 from swinging back and forth.

In addition, as shown in fig. 6, the second roller portion 332 protrudes in a stepped shape from the front surface of the first roller portion 331, and the outer circumference of the second roller portion 332 contacts the inner surface of the opening 201.

That is, when the carriage 300 is lifted or lowered by the lifting unit 700, the first guide roller 320 is rotated with its outer circumference contacting the front surface of the support frame 200, and the second guide roller 330 is rotated with the front surface of the first roller portion 331 contacting the end portion of the opening 201 and the outer circumference of the second roller portion 332 contacting the inner surface of the opening 201.

As described above, the first roller portion 331 of each of the second guide rollers 330 is formed integrally with the second roller portion 332, and thus, when the carriage 300 is slid upward or downward along the support frame 200 by the lifting unit 700, the carriage 300 is prevented from swinging back and forth due to the first guide roller 320 and the first roller portion 331 and from swinging left and right due to the second roller portion 332.

The master link 400 is coupled to the bracket 300, and as shown in fig. 1, a display T is placed on the front end of the master link 400.

As shown in fig. 7 and 9, the main link 400 is hinge-coupled to the support 310 of the bracket 300 using a first hinge 311, and thus can rotate like a seesaw.

The master link 400 may be adjusted using an angle adjustment unit 500 and a balance member 600, which will be described later, to change the viewing angle of the display T.

As shown in fig. 7 to 9, the angle adjusting unit 500 is provided on the bracket 300 to cause the main link 400 to perform a seesaw motion by means of the first hinge 311.

The angle adjustment unit 500 includes a first rack gear 510, a first pinion gear 520, and a second motor 530.

As shown in fig. 8 and 9, the first rack gear 510 is shaped like a fan and is disposed on the rear side of the main link 400.

As shown in fig. 8 and 9, a first pinion gear 520 is provided on the carrier 300 in mesh with the first rack gear 510.

In addition, a second motor 530 is provided on the carrier 300 to rotate the first pinion gear 520.

If the second motor 530 rotates, the main link 400 rotates like a seesaw by means of the first hinge 311 through the first pinion 520 and the first rack gear 510, and thus the viewing angle of the display T placed on the front end of the main link 400 is adjusted.

As described above, since the angle adjustment unit 500 includes the first rack gear 510, the first pinion gear 520, and the second motor 530, the viewing angle of the display T can be easily adjusted by rotating the second motor 530.

Unlike in the present embodiment, another well-known technique may be applied to the angle adjustment unit 500 to adjust the viewing angle of the display T.

The balancing part 600 is provided on the rear end of the main link 400 to balance the weight of the monitor T.

That is, the balance member 600 prevents the master link 400 from leaning forward against the first hinge 311 due to the weight of the display T placed on the front end of the master link 400, thereby maintaining the balance of the master link 400 without a forward eccentric force.

As described above, the balance member 600 maintains balance without the weight of the display T causing forward displacement of the center of gravity, thereby ensuring stable angle adjustment using the angle adjustment unit 500 and preventing forward falling due to the weight of the display T.

As shown in fig. 7 to 9, the balancing member 600 includes a weight member 610, a guide bar 620, a connecting rope 630, and a guide roller 640.

A guide hole 611 is vertically formed through the weight member 610, and as shown in fig. 7 to 9, the weight member 610 is placed at the rear lower side of the bracket 300.

The weight part 610 has a weight corresponding to the weight of the display T.

In addition, a guide rod 620 (to be described later) is inserted into the guide hole 611, so that the guide hole 611 can guide the weight member 610 when the weight member 610 is lifted or lowered by the lifting unit 700.

As shown in fig. 3, the lower end portion of the guide 620 is placed on the base 110, and the upper end portion of the guide 620 is placed on the case 100.

The guide rod 620 is inserted into the weight part 610 through the guide hole 611 so that the guide rod 620 can guide the weight part 610 when the weight part 610 is lifted or lowered by the lifting unit 700.

In addition, as shown in fig. 7 to 9, one end of each connection rope 630 is coupled to the rear end of the main link 400, and the other end of each connection rope 630 is coupled to the upper portion of the weight member 610.

That is, the connection rope 630 connects the weight part 610 to the rear end of the main link 400.

In addition, although the rear end of the main link 400 moves forward and backward when the main link 400 is moved like a seesaw by the angle adjusting unit 500 as described above, the weight part 610 does not move forward and backward due to the connection rope 630.

In addition, since the weight part 610 is placed at the lower side of the bracket 300, the entire volume of the apparatus for adjusting the position of the display using the chain is reduced.

That is, if the weight part 610 is directly coupled to the rear end of the main link 400, the front-to-rear width of the weight part 610 and the main link 400 may be increased. However, as shown in fig. 3, since the weight member 610 is connected using the connection string 630 to be placed at the rear lower side of the bracket 300, the front-rear width may be reduced.

As shown in fig. 7 to 9, a guide roller 640 is provided on the bracket 300 to guide the connection cord 630.

That is, the guide roller 640 guides the connection rope 630 such that the weight part 610 is prevented from swinging back and forth when the weight part 610 vertically moves due to the angle adjustment of the main link 400 using the angle adjustment unit 500.

In more detail, when the main link 400 is horizontally placed and leans down and forward due to the seesaw motion, the weight part 610 may be forced to move up and down and forward and backward. However, in this case, since the guide roller 640 guides the connection rope 630, the weight part 610 moves only up and down without moving back and forth.

As described above, since the guide roller 640 is provided to guide the connection cord 630, the weight part 610 is prevented from moving forward and backward during the seesaw movement of the main link 400, thereby preventing the weight part 610 from colliding with or affecting other components and reducing the front-to-rear width. In addition, the weight part 610 may be smoothly lifted or lowered along the guide 620.

Further, due to the provision of the guide rod 620, when the weight member 610 is lifted or lowered by the lifting unit 700, the weight member 610 may not swing back and forth and right and left but may smoothly move.

The lifting unit 700 is configured to lift and lower the bracket 300 and the main link 400 along the support frame 200.

The lifting unit 700 includes a driving shaft 710, a driving sprocket 720, a driven sprocket 730, a chain 740, and a first motor 750.

As shown in fig. 3 to 5, the driving shaft 710 is disposed in the lower portion of the support frame 200 in such a manner that the driving shaft 710 protrudes from both sides of the support frame 200.

In addition, driving sprockets 720 are provided on both ends of the driving shaft 710.

That is, as shown in fig. 2 to 5, the driving sprocket 720 is provided in such a manner that the driving sprocket 720 is positioned on both lower outer sides of the pair of support frames 200.

In addition, as shown in fig. 2 to 5, a driven sprocket 730 is disposed on an upper outer side of the support frame 200 and corresponds to the driving sprocket 720.

As shown in fig. 2 to 5, preferably, the driving sprocket 720 may be provided with a tension adjusting unit 731 positioned on an upper portion of the support frame 200 to adjust the tension of a chain 740 (to be described later).

As shown in fig. 5, a chain 740 is provided on the driving sprocket 720 and the driven sprocket 730.

In addition, the rear end of the bracket 300 is coupled to the chain 740.

As shown in fig. 5, a first motor 750 is disposed between the respective support frames 200 to rotate the driving shaft 710.

When the first motor 750 rotates, the driving shaft 710 rotates, and thus the chain 740 disposed around the driving sprocket 720 and the driven sprocket 730 rotates, thereby vertically lifting or lowering the bracket 300 having one side coupled to the chain 740.

As described above, since the lifting unit 700 includes the driving shaft 710, the driving sprocket 720, the driven sprocket 730, the chain 740, and the first motor 750, the bracket 300 and the main link 400 are lifted or lowered along the support frame 200 as the chain 740 is rotated by the rotation of the first motor 750.

In addition, since the lifting and lowering operation is performed using the chain 740, the lifting and lowering operation can be smoothly performed, and malfunction or trouble can be minimized even when substances such as dust are accumulated.

As shown in fig. 1, an elongated hole 101 is formed in the front side of the housing 100, the main link 400 protrudes and slides through the elongated hole 101, and the lower end of the housing 100 is fixed to the base 110.

In the present embodiment, the case 100 includes a body plate 120 enclosing the components, a front plate 130 disposed on a front side of the body plate 120 and including an elongated hole 101, and a cover plate 140 configured to cover an upper portion.

Unlike in the present embodiment, the case 100 may be provided in one body, or the body plate 120 may include a side plate and a rear plate coupled to the side plate, if necessary.

The case 100 prevents substances, such as dust, from being introduced into components disposed in the case 100.

Mounting holes 121 are formed in the left and right sides of the case 100, and the

speaker exposing unit

800, 900, 80, or 90 to which the speaker S is coupled to the mounting hole 121.

This will be explained in detail later.

The housing is disposed on the elongated hole 101 of the front plate 130 to close the elongated hole 101.

That is, the shield closes the long hole 101 to prevent substances such as dust from being introduced into the case 100 through the long hole 101 except where the main link 400 protrudes through the long hole 101.

The

speaker exposing unit

800, 900, 80 or 90 is configured to retract the speaker S into the housing 100 and extend the speaker S outward from the housing 100.

That is, the

speaker exposing unit

800, 900, 80 or 90 is configured such that the speaker S can be extended outward from the housing 100 through the mounting hole 121 when the display T is used and can be retracted into the housing 100 when the display T is not used.

The

speaker exposing units

800, 900, 80, and 90 are provided according to four embodiments.

First, as shown in fig. 10 to 15B, each of the speaker exposing units 800 includes a slidable member 810, a guide groove 820, a guide protrusion 830, a second rack gear 840, a second pinion 850, a third motor 860, a sensor unit, and a control unit.

As shown in fig. 10, the slidable member 810 on which the speaker S is placed slides into and out of the housing 100 through the mounting hole 121.

As shown in fig. 13 to 15B, the slidable member 810 includes a rail mounting groove 811, a speaker mounting groove 812, and a cover 813.

The rail mounting groove 811 is opened toward the housing 100, and the second rack gear 840 and the guide groove 820 or the guide protrusion 830 are disposed in the rail mounting groove 811.

The speaker mounting recess 812 is located at one side of the rail mounting recess 811 to place the speaker S in the speaker mounting recess 812.

That is, the speaker mounting recess 812 is formed at one side of the guide groove 820 so that the speaker S can face forward, i.e., toward the viewer.

As described above, the second rack gear 840 and the guide groove 820 or the guide protrusion 830 are disposed in the rail mounting groove 811, and the speaker S is placed in the speaker mounting groove 812, thereby preventing the second rack gear 840, the guide groove 820 or the guide protrusion 830, and the speaker S from being exposed to the outside of the slidable member 810 and contaminated by dust and the like.

The speaker S is vertically slid into the speaker mounting recess 812 and coupled to the speaker mounting recess 812.

In addition, as shown in fig. 13 to 15B, a protection plate 812a may be provided on the front side of the speaker mounting recess 812 to protect the speaker S. However, in some cases, such a protective shield may not be provided.

As described above, since the speaker S is vertically slid into the speaker mounting recess 812 and coupled to the speaker mounting recess 812, the mounting of the speaker S can be easily performed while preventing the speaker S coupled to the slidable member 810 from being detached in any direction.

Covers 813 are provided on the upper and lower surfaces of the slidable member 810 to close the upper and lower sides of the rail mounting recess 811 and the speaker mounting recess 812.

That is, since the upper and lower surfaces of the slidable member 810 opened by the rail mounting groove 811 and the speaker mounting groove 812 are closed with the cover 813, a substance such as dust is prevented from being introduced and the speaker S is not separated through the lower side.

When the slidable member 810 extends outward from the housing 100 as shown in fig. 10 and 15A, the mounting hole 121 is closed by the front side, the rear side, and the lateral side of the slidable member 810, and the cover 813. In addition, after the slidable member 810 is retracted into the housing 100 as shown in fig. 11 and 15B, the mounting hole 121 is closed by the lateral side of the slidable member 810.

Since the slidable member 810 closes the mounting hole 121 as described above, it is possible to prevent substances such as dust from being introduced into the housing 100 through the mounting hole 121.

The slidable member 810 may have another shape than that shown in the present embodiment.

A guide groove 820 is formed in the slidable member 810.

In more detail, as shown in fig. 12A to 14, the guide groove 820 is provided at the rail mounting groove 811 of the slidable member 810.

In addition, a guide protrusion 830 is formed on the housing 100 and coupled to the guide groove 820 to slide along the guide groove 820.

Unlike this, the positions of the guide groove 820 and the guide protrusion 830 may be reversed.

The second rack gear 840 is provided on the slidable member 810 in a direction toward the housing 100.

That is, as shown in fig. 12A to 15B, the second rack gear 840 is disposed in the rail mounting groove 811 of the slidable member 810 in a direction toward the housing 100.

In addition, a second pinion gear 850 is provided on the fixing plate 890 of the housing 100 and is engaged with the second rack gear 840.

In addition, a third motor 860 is provided on the fixed plate 890 to rotate the second pinion gear 850.

If the third motor 860 rotates, as shown in fig. 15A and 15B, the second pinion 850 rotates to move the second rack gear 840, and then the slidable member 810 is slid into and out of the housing 100 through the mounting hole 121 while being guided by the guide groove 820 and the guide protrusion 830.

As described above, since each of the speaker exposure units 800 includes the slidable member 810, the guide groove 820, the guide protrusion 830, the second rack gear 840, the second pinion 850, and the third motor 860, the speaker S may extend outward from the housing 100 to provide sound when in use, and may be retracted into the housing 100 to avoid exposure to the outside when not in use.

The sensor unit detects whether the display T is turned on or off.

In addition, a control unit (not shown in the drawings) controls the third motor 860 according to a signal from the sensor unit.

The control unit (not shown in the drawings) controls the third motor 860 to extend the speaker S outward from the housing 100 according to a signal of the sensor unit indicating that the display T is turned on, and controls the third motor 860 to retract the speaker S into the housing 100 according to a signal of the sensor unit indicating that the display T is turned off.

As described above, the speaker S is automatically extended out of or retracted into the housing 100 by the control unit according to whether the display T is turned on or off.

In addition, as necessary, as shown in fig. 12A and 12B, a position detection sensor 814 capable of detecting the position of the slidable member 810 may be provided to detect whether the speaker S is in the retracted position in the housing 100 or in the protruding position outside the housing 100.

Second, as shown in fig. 16 to 20A and 20B, each of the speaker exposing units 900 includes a rotatable member 910, a driven gear 920, a driving gear 930, a fourth motor 940, a sensor unit, and a control unit.

A rotatable member 910 is hinged on the case 100 to open and close the mounting hole 121, and a speaker S is provided on the rotatable member 910.

As the rotatable member 910 rotates, the speaker S protrudes outward from the housing 100 or retracts into the housing 100 as shown in fig. 16 and 17.

As shown in fig. 18 to 20A and 20B, the rotatable member 910 includes a first body plate 911, a second body plate 912, a speaker mounting groove 913, and a hinge shaft 914.

As shown in fig. 20A and 20B, a first substrate plate 911 is used to close and open the mounting hole 121.

In more detail, as shown in fig. 20A, when the speaker S is located inside the casing 100, the first body plate 911 closes the mounting hole 121.

When the speaker S protrudes outward from the casing 100, the second body plate 912 closes the mounting hole 121.

That is, as shown in fig. 20A and 20B, the second body plate 912 is spaced apart from the first body plate 911 at an angle, and when the first body plate 911 does not close the mounting hole 121, the second body plate 912 closes the mounting hole 121.

In more detail, as shown in fig. 20B, when the speaker S protrudes outward from the casing 100, the second body plate 912 closes the mounting hole 121.

As described above, since the mounting hole 121 is closed by the first body plate 911 or the second body plate 912 regardless of whether the speaker S is located inside or outside the casing 100, a substance such as dust cannot be introduced into the casing 100 through the mounting hole 121.

The speaker mounting groove 913 is formed in such a manner that the speaker mounting groove 913 is open toward the front side of the first body panel 911 when the second body panel 912 closes the mounting hole 121, and the speaker S is placed in the speaker mounting groove 913.

The speaker S is vertically slid into the speaker mounting groove 913 and coupled to the speaker mounting groove 913.

In addition, as shown in fig. 16 to 20B, a protection plate 913a may be provided on the front side of the speaker mounting groove 913 to protect the speaker S. However, in some cases, the protection plate 913a may not be provided.

As described above, since the speaker S is vertically slid into the speaker mounting groove 913 and coupled to the speaker mounting groove 913, the mounting of the speaker S can be easily performed while preventing the speaker S coupled to the rotatable member 910 from being detached in any direction.

As shown in fig. 18 and 19, the following may be preferable: the upper and lower sides of the speaker mounting groove 913 are covered with a cover 915 to prevent the inserted speaker S from escaping and to prevent substances such as dust from being introduced.

As shown in fig. 18 and 19, hinge shafts 914 are placed at upper and lower surfaces where the first and

second block plates

911 and 912 contact each other, and are hinged on the upper and lower surfaces of the case 100 behind the mounting holes 121.

As the rotatable member 910 rotates by means of the hinge shaft 914, the mounting hole 121 of the housing 100 is selectively closed by the first body plate 911 and the second body plate 912.

That is, when the speaker mounting groove 913 is placed inside the housing 100 through the mounting hole 121 as the rotatable member 910 rotates by means of the hinge shaft 914 as shown in fig. 20A, the first body plate 911 closes the mounting hole 121, and when the speaker mounting groove 913 is placed outside the housing 100 through the mounting hole 121 as the rotatable member 910 rotates by means of the hinge shaft 914 as shown in fig. 20B, the second body plate 912 closes the mounting hole 121.

The driven gear 920 is provided on the hinge coupling portion of the rotatable member 910.

That is, as shown in fig. 19, the driven gear 920 is disposed on the hinge shaft 914 below the rotatable member 910.

In addition, a driving gear 930 is provided on the case 100 to mesh with the driven gear 920.

In addition, a fourth motor 940 is provided on the case 100 to rotate the driving gear 930.

As the rotatable member 910 is rotated by the rotation of the fourth motor 940, the speaker S provided on the rotatable member 910 is retracted into the housing 100 or protrudes outward from the housing 100 as shown in fig. 20A and 20B.

As described above, each of the speaker exposing units 900 includes the rotatable member 910, the driven gear 920, the driving gear 930, and the fourth motor 940. Thus, when the speaker S is in use, the speaker S may be placed outward from the housing 100 by rotating the rotatable member 910 to provide sound, and when the speaker S is not in use, the speaker S may be retracted into the housing 100 by rotating the rotatable member 910 in the opposite direction, i.e., not exposed to the outside.

A sensor unit (not shown in the figure) detects whether the display T is turned on or off.

In addition, a control unit (not shown in the drawings) controls the fourth motor 940 according to a signal from the sensor unit.

The control unit (not shown in the drawings) controls the fourth motor 940 to extend the speaker S outward from the housing 100 according to a signal of the sensor unit indicating that the display T is turned on, and controls the fourth motor 940 to retract the speaker S into the housing 100 according to a signal of the sensor unit indicating that the display T is turned off.

In addition, when necessary, as shown in fig. 19, the following may be preferable: a position detection sensor 916 capable of detecting the position of the rotatable member 910 is provided to detect whether the speaker S is located inside the housing 100 or protrudes outward from the housing 100.

Third, as shown in fig. 21 to 26B, each of the speaker exposing units 80 includes a slidable member 81, a guide groove 82, a guide protrusion 83, a sixth rack gear 84, a sixth pinion gear 85, a sixth motor 86, a sensor unit, and a control unit.

As shown in fig. 21 and 22, the slidable member 81 has a structure that opens toward the housing 100

Shaped and slidable into and out of the housing 100 through the mounting holes 121.

As shown in fig. 23A to 26B, the slidable member 81 includes a rail mounting groove 81a, a speaker mounting hole 81B, and a cover 81 c.

The rail mounting groove 81a is opened toward the housing 100, and the sixth rack gear 84 and the guide groove 82 or the guide protrusion 83 are disposed in the rail mounting groove 81 a.

Speaker mounting holes 81b are formed in the lateral surface of the slidable member 81.

In more detail, the speaker mounting hole 81b is formed in a side of the slidable member 81 opposite to the housing 100.

That is, the speaker mounting hole 81b faces the lateral side of the housing 100.

As shown in fig. 23A to 26B, the speaker S is disposed in the speaker mounting hole 81B.

In the present embodiment, the speaker mounting holes 81b are formed in two locations vertically spaced apart from each other on the lateral surface of the slidable member 81. However, unlike in the present embodiment, one or three or more speaker mounting holes 81b may be formed.

Covers 81c are provided on upper and lower surfaces of the slidable member 81 to close upper and lower sides of the rail mounting groove 81 a.

That is, the upper and lower surfaces of the slidable member 81 opened through the rail mounting groove 81a are closed by the cover 81c to prevent substances such as dust from being introduced.

When the slidable member 81 extends outward from the housing 100 as shown in fig. 21 and 26B, the mounting hole 121 is closed by the front side, the rear side, and the lateral side of the slidable member 81, and the cover 81 c. In addition, after the slidable member 81 is retracted into the housing 100 as shown in fig. 22 and 26A, the mounting hole 121 is closed by the lateral side of the slidable member 810 (i.e., the lateral surface of the slidable member 810 in which the speaker mounting hole 81b is formed).

Since the slidable member 81 closes the mounting hole 121 as described above, it is possible to prevent substances such as dust from being introduced into the housing 100 through the mounting hole 121.

A guide groove 82 is formed in the slidable member 81.

In more detail, as shown in fig. 23A to 26B, the guide groove 82 is provided at the rail mounting groove 81a of the slidable member 81.

In addition, a guide protrusion 83 is formed on the fixing plate 89 of the housing 100, and is coupled to the guide groove 82 to slide along the guide groove 82.

Unlike this, the positions of the guide groove 82 and the guide projection 83 may be reversed.

The sixth rack gear 84 is provided on the slidable member 81 in a direction toward the housing 100.

That is, as shown in fig. 23A to 25, the sixth rack gear 84 is disposed in the rail mounting groove 81a of the slidable member 81 in a direction toward the housing 100.

In addition, the sixth pinion gear 85 is provided on the fixed plate 89 of the housing 100 and meshes with the second rack gear.

In addition, a sixth motor 86 is provided on the fixed plate 89 to rotate the sixth pinion gear 85.

If the sixth motor 86 rotates, as shown in fig. 26A and 26B, the sixth pinion gear 85 rotates to move the sixth rack gear 84, and then the slidable member 81 is slid into and out of the housing 100 through the mounting hole 121 while being guided by the guide groove 82 and the guide protrusion 83.

As described above, since each of the speaker exposing units 80 includes the slidable member 81, the guide groove 82, the guide protrusion 83, the sixth rack gear 84, the sixth pinion 85, and the sixth motor 86, the speaker S may extend outward from the housing 100 to provide sound when in use, and may be pulled into the lateral side of the housing 100 when not in use, i.e., not exposed to the outside.

The sensor unit detects whether the display T is turned on or off.

In addition, a control unit (not shown in the drawings) controls the sixth motor 86 according to a signal from the sensor unit.

The control unit (not shown in the drawings) controls the sixth motor 86 to extend the speaker S outward from the housing 100 according to a signal of the sensor unit indicating that the display T is turned on, and controls the sixth motor 86 to pull the speaker S into the lateral side of the housing 100 according to a signal of the sensor unit indicating that the display T is turned off.

As described above, the speaker S is automatically extended out of or pulled into the lateral side of the housing 100 by the control unit according to whether the display T is turned on or off.

In addition, as necessary, as shown in fig. 24, a position detection sensor 87 capable of detecting the position of the slidable member 81 may be provided to detect whether the speaker S is drawn into the lateral side of the housing 100 or extended outward from the housing 100.

Fourth, as shown in fig. 27 to 31B, each of the speaker exposing units 90 includes a rotatable member 91, a driven gear 92, a driving gear 93, a seventh motor 94, a sensor unit, and a control unit.

The rotatable member 91 is hinged to the housing 100 to open and close the mounting hole 121 and retract the speaker S into the housing 100 and extend the speaker S outward from the housing 100.

That is, as the rotatable member 91 rotates, the speaker S is extended outward from the housing 100 or retracted into the housing 100 as shown in fig. 27 and 28.

As shown in fig. 29 to 31B, the rotatable member 91 includes a first block plate 91a, a second block plate 91B, a front plate 91c, a speaker mounting hole 91d, and a hinge shaft 91 e.

As shown in fig. 31A and 31B, the first block plate 91A is used to close and open the mounting hole 121.

In more detail, as shown in fig. 31A, when the speaker S is located inside the casing 100, the first block plate 91A closes the mounting hole 121.

In addition, when the speaker S protrudes outward from the casing 100, the second body plate 91b closes the mounting hole 121.

That is, as shown in fig. 31A and 31B, the second block plate 91B is spaced apart from the first block plate 91A at an angle, and when the first block plate 91A does not close the mounting hole 121, the second block plate 91B closes the mounting hole 121.

In more detail, as shown in fig. 31B, when the speaker S protrudes outward from the casing 100, the second body plate 91B closes the mounting hole 121.

As described above, since the mounting hole 121 is closed by the first body plate 91a or the second body plate 91b regardless of whether the speaker S is located inside or outside the enclosure 100, a substance such as dust cannot be introduced into the enclosure 100 through the mounting hole 121.

As shown in fig. 27 to 31B, a front plate 91c is provided on the front side of the first and second block plates 91a and 91B spaced apart from each other at an angle.

That is, the front plate 91c is provided on the front side of the first block plate 91a and the second block plate 91b so as to form an empty triangular cross section together with the first block plate 91a and the second block plate 91 b.

Speaker mounting holes 91d are formed in the front plate 91 c.

The speaker S is placed in the speaker mounting hole 91 d.

In addition, as shown in fig. 27 to 31B, a protection plate 91f may be provided on the front side of the front plate 91c to protect the speaker S placed in the speaker mounting hole 91 d. However, in some cases, the protection plate 91f may not be provided.

In addition, as shown in fig. 29 and 30, the following may be preferable: the upper and lower sides of the inner space formed by the front plate 91c, the first block plate 91a, and the second block plate 91b are covered by the cover 91g to prevent substances such as dust from being introduced.

As shown in fig. 29 and 30, hinge shafts 91e are placed at upper and lower surfaces where the first and

second block plates

91a and 91b contact each other, and are hinged on the upper and lower surfaces of the case 100 behind the mounting holes 121.

As the rotatable member 91 rotates by means of the hinge shaft 91e, the mounting hole 121 of the housing 100 is selectively closed by the first block plate 91a and the second block plate 91 b.

That is, when the front plate 91c including the speaker mounting hole 91d is placed inside the housing 100 through the mounting hole 121 as the rotatable member 91 rotates by means of the hinge shaft 91e as shown in fig. 31A, the first block plate 91A closes the mounting hole 121, and when the front plate 91c including the speaker mounting hole 91d is placed outside the housing 100 through the mounting hole 121 as the rotatable member 91 rotates by means of the hinge shaft 91e as shown in fig. 31B, the second block plate 91B closes the mounting hole 121.

The driven gear 92 is provided on the hinge coupling portion of the rotatable member 91.

That is, as shown in fig. 30, the driven gear 92 is provided on the hinge shaft 91e below the rotatable member 91.

In addition, a drive gear 93 is provided on the housing 100 to mesh with the driven gear 92.

In addition, a seventh motor 94 is provided on the housing 100 to rotate the driving gear 93.

As the rotatable member 91 is rotated by the rotation of the seventh motor 94, the speaker S provided on the rotatable member 91 moves into the housing 100 or moves out of the housing 100 as shown in fig. 31A and 31B.

In addition, a control unit (not shown in the drawings) controls the seventh motor 94 according to a signal from the sensor unit.

The control unit (not shown in the drawings) controls the seventh motor 94 to extend the speaker S outwardly from the housing 100 according to a signal of the sensor unit indicating that the display T is turned on, and controls the seventh motor 94 to retract the speaker S into the housing 100 according to a signal of the sensor unit indicating that the display T is turned off.

In addition, when necessary, as shown in fig. 30, the following may be preferable: a position detection sensor 95 capable of detecting the position of the rotatable member 91 is provided to detect whether the speaker S is located inside the housing 100 or protrudes outward from the housing 100.

The apparatus for adjusting the position of the display using the chain of the present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the present invention.

INDUSTRIAL APPLICABILITY

According to the present invention, when the device for adjusting the position of the display is used to lift or lower the display mounted thereon, the lifting or lowering operation can be smoothly performed using the chain.

Claims

1. An apparatus for adjusting a position of a display using a chain, the apparatus comprising:

a base;

a pair of support frames configured in a vertically parallel manner and fixed to left and right sides of an upper surface of the base;

a bracket slidably coupled between the support frames to be lifted and lowered along the support frames;

a main link rotatably coupled to the bracket in a vertical direction, a display being disposed on one end of the main link;

a lifting unit configured to lift and lower the bracket and the main link along the support frame; and

a housing including a front surface in which a long hole is formed and a lower end fixed to the base, the main link protruding through the long hole and being slidable in the long hole,

wherein the lifting unit comprises: a driving shaft rotatably supported by lower portions of the pair of support frames, both end portions of the driving shaft protruding from both sides of the support frames; a pair of driving sprockets provided on both ends of the driving shaft; a pair of driven sprockets corresponding to the driving sprockets and rotatably provided on upper outer sides of the support frames, respectively; a pair of chains provided around the driving sprocket and the driven sprocket, the bracket being fixed to sides of the chains; and a first motor disposed between the support frames to rotate the driving shaft,

a support protruding forward from the bracket, and the main link is rotatably hinged on the support using a first hinge to move like a seesaw,

wherein the apparatus further comprises:

an angle adjusting unit provided on the bracket to move the main link like a seesaw by means of the first hinge; and

a balance member provided on a rear end of the main link to balance with a weight of the display.

2. The device of claim 1, wherein each of the support frames has an □ -shaped cross-section with a rearwardly-opening,

wherein first guide rollers are disposed on left and right front sides of the bracket and vertically spaced apart from each other to rotate with outer circumferences of the first guide rollers contacting a front surface of the support frame, and second guide rollers are disposed on left and right rear sides of the bracket and vertically spaced apart from each other, the second guide rollers being disposed on a rear side of the support frame,

wherein each of the second guide rollers comprises: a first roller portion having a front surface contacting an end portion of the opening of the support frame; and a second roller portion protruding in a stepped shape from the front surface of the first roller portion to rotate with an outer circumference of the second roller portion contacting an inner surface of the opening, the first roller portion being formed integrally with the second roller portion,

wherein when the carriage is lifted or lowered by the lifting unit, the first guide roller rotates with the outer circumference thereof contacting the front surface of the support frame, and the second guide roller rotates with the front surface of the first roller portion contacting the end portion of the opening of the support frame and the outer circumference of the second roller portion contacting the inner surface of the opening of the support frame, so that the first guide roller and the second guide roller prevent the carriage from swinging.

3. The apparatus of claim 1, wherein the angle adjusting unit comprises:

a first rack gear having a fan shape and fixed to a rear side of the main link;

a first pinion gear provided on the carriage in meshing engagement with the first rack gear; and

a second motor provided on the carrier to rotate the first pinion gear,

wherein when the second motor rotates, the main link moves like a seesaw by means of the first hinge through the first pinion and the first rack gear, so that a viewing angle of the display is adjusted.

4. The apparatus of claim 1, wherein the balancing member comprises:

a weight part including a guide hole vertically formed therethrough, the weight part being placed at a rear lower side of the bracket;

a guide bar including a lower end portion placed on the base and an upper end portion placed on the housing, the guide bar being inserted into the guide hole to guide the weight member;

a connection rope including one end coupled with the rear end of the main link and the other end coupled with an upper portion of the weight part; and

a guide roller disposed on the bracket and guiding the connection rope,

wherein the guide roller guides the connection rope such that the weight member is prevented from swinging back and forth when the weight member is vertically moved by adjusting the angle of the main link using the angle adjusting unit,

wherein the guide bar guides the weight member in a vertical direction when the weight member is lifted or lowered by the lifting unit.

5. The apparatus according to any one of claims 1 to 4, wherein a mounting hole is formed in each of left and right sides of the housing to place a speaker therein, and

the apparatus further includes a speaker exposing unit configured to retract the speaker into the housing or extend the speaker outward from the housing.

6. The apparatus of claim 5, wherein the speaker exposure unit comprises:

a slidable member movable into and out of the housing through the mounting hole, the speaker being placed on the slidable member, the slidable member including a guide groove and a second rack gear;

a fixed plate fixed to the housing, the fixed plate including a guide protrusion configured to slide in the guide groove and a second pinion gear engaged with the second rack gear; and

a third motor provided on the fixed plate to rotate the second pinion gear,

wherein when the third motor is operated, the second pinion gear interacts with the second rack gear such that the slidable member on which the speaker is placed is moved into and out of the housing through the mounting hole.

7. The apparatus of claim 6, wherein the slidable member comprises:

a guide rail installation groove opened toward the housing, the second rack gear and the guide groove being disposed in the guide rail installation groove;

a speaker mounting groove formed at one side of the rail mounting groove to place the speaker therein; and

a plurality of covers provided on upper and lower surfaces of the slidable member to close upper and lower sides of the rail mounting groove and upper and lower sides of the speaker mounting groove,

wherein when the slidable member protrudes outward from the housing, the mounting hole is closed by the front side, the rear side, and the lateral sides of the slidable member, and the cover, and

the mounting hole is closed by the lateral side of the slidable member when the slidable member is retracted into the housing.

8. The apparatus of claim 7, wherein the speaker is vertically slid into and coupled to the speaker mounting recess.

9. The apparatus of claim 5, wherein the speaker exposure unit comprises:

a rotatable member hinged on the housing to open and close the mounting hole, the speaker being placed on the rotatable member;

a driven gear provided on the hinge coupling portion of the rotatable member;

a drive gear provided on the housing in mesh with the driven gear; and

a fourth motor provided on the housing to rotate the driving gear,

wherein when the fourth motor is operated, the rotatable member is rotated such that the speaker placed on the rotatable member enters the housing through the mounting hole or protrudes outward from the housing.

10. The apparatus of claim 9, wherein the rotatable member comprises:

a first block plate in which a speaker mounting groove is formed to place the speaker in the speaker mounting groove, the first block plate being configured to close the mounting hole when the speaker is moved into the housing;

a second body plate configured to close the mounting hole when the speaker protrudes outward from the housing; and

hinge shafts placed at upper and lower surfaces where the first and second block plates contact each other, the hinge shafts being hinged on the upper and lower surfaces of the housing behind the mounting hole,

wherein the first block plate closes the mounting hole when the speaker is placed in the housing through the mounting hole as the rotatable member rotates by means of the hinge shaft, and the second block plate closes the mounting hole when the speaker protrudes outward from the housing through the mounting hole as the rotatable member rotates by means of the hinge shaft.

11. The apparatus of claim 10, wherein the speaker is vertically slid into and coupled to the speaker mounting recess, and

covers are fixed to upper and lower sides of the speaker mounting groove to prevent the speaker from being detached.

12. The apparatus of claim 6, further comprising:

a sensor unit configured to detect whether the display is turned on or off; and

a control unit configured to control the third motor according to a signal of the sensor unit,

wherein the control unit controls the third motor to extend the speaker outward from the housing according to a signal of the sensor unit indicating that the display is turned on, and controls the third motor to retract the speaker into the housing according to a signal of the sensor unit indicating that the display is turned off.

13. The apparatus of claim 9, further comprising:

a sensor unit configured to detect whether the display is turned on or off; and

a control unit configured to control the fourth motor according to a signal of the sensor unit,

wherein the control unit controls the fourth motor to extend the speaker outward from the housing according to a signal of the sensor unit indicating that the display is turned on, and controls the fourth motor to retract the speaker into the housing according to a signal of the sensor unit indicating that the display is turned off.