KR200333463Y1 - Projector lifter - Google Patents

Abstract

The present invention discloses a projector lifter.

The projector lifter of the present invention has a housing which is installed in the ceiling and opened to the interior side, a motor which is fixedly installed on one side of the housing to generate forward and reverse rotational force, a rotation shaft which is shaft-coupled to the motor, and rotates inside the housing. A plurality of rollers to be installed, one end of which is fixed to the rotating shaft, and selectively wound or unwound, and the other end of which is connected to the upper surface of the housing along the roller, and the other end of the band wire is connected to an upper surface to be selectively selected by an interlocking operation. The case is inserted into the housing or exposed to the outside and the projector is mounted therein, and upper and lower ends are connected to both side walls of the housing and both sides of the case, and are folded or unfolded vertically in conjunction with the case's lifting and lowering operation. In the projector lifter consisting of a folding connection,

Is installed on one open side of the housing is configured to include a door device for selectively opening and closing the doorway formed in the ceiling in conjunction with the case.

Description

Projector lifter

The present invention relates to a ceiling-embedded projector lifter, and more particularly, to a projector lifter for interlocking a lifter to shield an entrance formed in a ceiling to improve the protection and interior of the projector.

In general, a projector is a device used to connect an external device such as a PC, DVD, VCR, camcorder, etc. to project a desired PC screen or video on the screen as an extra large screen.

These projectors are widely used in corporations and public institutions, such as meetings and presentations, by eliminating the hassle of conventional OHP devices and projecting various materials on a PC onto a large screen directly on the screen. It can be used for watching movies at home, small theaters, cafes, etc.

There are many such projectors, but they are largely classified into PRT-type projectors and LCD-type projectors according to the type of devices that produce images.

The PRT projector uses a high-performance PRT (such as Brown used for TV) to project the screen. It is composed of three projection lenses, and the image quality is natural and clear. Some are being used.

In addition, LCD projectors use LCD for displaying the screen, and nowadays, the size is getting smaller and the brightness is getting brighter. Also, the LCD projector is used in schools, government offices and corporations because of its excellent compatibility with PCs.

Such projectors are mainly installed on the floor or fixed to the ceiling, which protrudes to the outside even when not in use, which causes disadvantages in that the space can not be utilized efficiently, and especially the risk of damage is great. have.

Therefore, in order to solve such a problem, conventionally, a lifter for storing the projector inside the ceiling when the projector is not in use has been proposed, and the present applicant has prevented the slip phenomenon caused by the wire driving method in the conventional ceiling embedded projector lifter. Lifter (Utility Model Registration Application No. 01-8564 / Registration No. 02339675) has been proposed.

1 to 3 is a schematic view showing a projector lifter according to the prior art.

As shown therein, the projector lifter includes a housing 100 that is largely embedded in the ceiling, a motor m installed to one side of the housing 100 to generate driving force, and connected to the motor m to integrally Rotation axis (ms) and one end of the rotation in the forward and reverse direction is connected to the rotation axis (ms) and the band wire (w) wound or unwind along the outer circumference and connected to the other end of the band wire (w) interlocked The case 200 and the folding connecting body 300 which hold | maintain the raising / lowering operation | movement of this case 200 stably are comprised.

The projector lifter configured as described above causes the motor m to generate driving force in the forward and reverse directions, and the rotation shaft ms rotates integrally. As a result, the band wire w is wound on the rotation shaft ms. It will be released.

At this time, when the band wire (w) is loosened, as shown in FIG. 3, the case 200 is lowered. In this case, the case 200 is prevented from flowing in the horizontal direction by the folding connector 300. do.

like this. When the case 200 is in a completely exposed state from the housing 100, the projector p is also exposed to the outside and thus can be used.

On the other hand, when the pair of band wire (w) is wound on the rotation axis (ms) the case 200 is made to lift, the lifting operation of the case 200 at this time is the lowering operation process of the case 200 That's the same thing. However, the folding connection body 300 is contracted in the vertical direction while taking the form that the overall width is wide when lifting the case 200.

However, the projector lifter pre- filed by the applicant, which is configured as described above, deteriorates aesthetics in terms of interior interior because the entrance is exposed on the ceiling side even when the lifter p provided in the case 200 is not used. There are disadvantages.

In addition, since the expensive projector (p) is exposed through an entrance formed in the ceiling, there is a problem in that there is a limit in device protection.

The present invention has been made to solve the above problems, the object of the present invention is to interlock with the lifting and lowering operation of the projector lifter on the ceiling to open and close the doorway formed on the ceiling to protect the device while not hindering the interior aesthetics. To avoid providing a projector lifter.

1 to 3 is a schematic view showing a projector lifter according to the prior art,

4 is a view showing a state in which a projector is accommodated as a first embodiment of a projector lifter according to the present invention;

5 to 6 is an exemplary view showing an operating state of FIG.

7 is a partial cutaway perspective view of FIG. 4;

8 to 9 is a side configuration view showing a second embodiment of the door device in the projector lifter according to the present invention,

10 to 11 are partial cutaway perspective views of FIG. 8,

12 to 13 is a side configuration view showing a third embodiment of the door device in the projector lifter according to the present invention.

<Explanation of symbols for the main parts of the drawings>

10 housing 11 guide hole

20: case 30: folding connector

40, 45: 1st, 2nd guide post

Projector lifter according to the present invention for realizing the above object is a housing which is installed in the ceiling and opened to the interior side, a motor fixedly installed on one side of the housing to generate a forward and reverse rotational force, and a rotating shaft coupled to the motor, A plurality of rollers rotatably installed in the upper side of the housing, one end of which is fixed to the rotating shaft, and optionally wound or unrolled, and the other end of which extends to the lower side of the housing along the roller, and the other end of the band wire Connected to the casing, which is selectively inserted into the housing by the interlocking operation or exposed to the outside, and the projector is mounted therein; upper and lower ends are connected to both side walls of the housing and both sides of the casing, and interlocked with the raising and lowering operation of the case. In the projector lifter, which consists of a folding connection It is installed on one open side of the housing characterized in that it comprises a door device for selectively opening and closing the doorway formed in the ceiling in conjunction with the case.

As a preferable feature of the present invention, the door device, a pair of guide holes formed vertically in the direction facing each other on both sides of the housing, one end is inserted into the guide hole and the other end is extended horizontally to the upper side of the case The first guide post, and the center portion is arranged and fixed to the upper surface side of the guide post, the second guide post is connected to one end of the wire extending downwards on both ends, and rotates to one side of the housing of the entrance side of the ceiling It is possible to be installed, the upper end is to consist of a door to which the other end of the wire is connected.

As another preferable feature of the present invention, the door device is provided with both ends of the first guide post is inserted into the guide hole, the second guide post is provided in a pair with a predetermined interval, the door is provided in a pair is left It is provided in the form which opens and closes right.

As another preferable feature of the present invention, at least one of the first guide post or the second guide post is provided with a contact protrusion for selectively contacting the upper surface of the case with its lower surface.

As another preferable feature of the present invention, the guide hole is formed in a length proportional to the rotation distance that is opened in the closed state of the door.

In another embodiment of the door lifter in the projector lifter according to the present invention, a curved guide hole formed to have a predetermined curvature in the longitudinal direction at a predetermined interval from each other on one side of the housing; Located at one side of each curve guide hole to rotate in conjunction with the lifting and lowering of the case in which the projector is housed, one end is fixed to the housing and the other end is provided with a projection inserted into the curve guide hole, one side of the projection A rotational link to which an upper end of the downwardly stretched wire is connected; A support part selectively contacting one end of the pivoting link to be provided at a predetermined interval on the case; The ceiling is configured to be rotatably installed on one side of the door and the upper surface is connected to the lower end of the wire is composed of a pair of doors to open and close in conjunction with the operation of the rotation link.

In another embodiment of the door lifter in the projector lifter according to the present invention, a pair of curved guide holes formed in a longitudinal direction at regular intervals on each side of the housing; A pair of pivoting links having a projection, one end of which is hinged between the pair of curve guide holes and the other end of which is inserted into each curve guide hole to rotate in association with the ascending and descending of the case in which the projector is received; A support portion provided at an upper portion of the case at a predetermined interval and selectively contacting one end of each of the pivot links; A pair of flexible doors provided at an entrance side of the ceiling and slidably moved to both sides and guided to an outer wall of the housing along a guider installed at one side of the housing; A plurality of rotating rollers rotatably installed at predetermined positions inside and outside the housing; A pair of one end is guided along the plurality of rotating rollers and fixed to one side of the projection link of each pivot link, one end is connected to one end of one flexible door, the other end is connected to the other end of the other flexible door that is opposite It consists of a wire and a.

Hereinafter, an embodiment of a projector lifter according to the present invention will be described with reference to the accompanying drawings.

4 to 7 are views showing a projector lifter to which the first embodiment of the door device according to the present invention is applied, and FIG. 4 is a view showing a stored state of the projector lifter according to the present invention, and FIGS. 4 is an exemplary view showing an operating state of the door apparatus in FIG. 4, and FIG. 7 is a partially cutaway perspective view of FIG. 4.

As shown in the drawing, the projector lifter of the present invention includes a box-shaped housing 10 having an open bottom surface embedded in a ceiling, and a motor for forward and reverse rotation on one side of the ceiling in which the housing 10 is installed. (m) and a rotating shaft (ms) which are shaft-joined and integrally rotate with this motor (m) are provided. One end of the pair of band wires w is connected to the rotation shaft ms, and the other end of the band wire w is guided to the pair of rollers r to be connected to the upper surface of the case 20. .

Here, the case 20 in which the projector p is accommodated is formed in a substantially box shape and is provided to a size that can be completely accommodated in the housing 10. The case 20 receives the driving force of the motor m by the configuration in which the pair of band wires w are connected to both sides of the upper surface, and thus the lifting and lowering operation is performed.

On the other hand, the case 20 is connected by the housing 10 and the folding connector 30, the folding connector 30 at this time is folded in the longitudinal direction in conjunction with the lifting operation of the case 20 The connecting bar having a plurality of rod-shaped so as to be folded or unfolded is foldably coupled, the folding connector 30 having such a configuration can be adjusted in the vertical direction at the same time having a predetermined displacement in the width direction do.

This configuration is similar to that of the conventional projector lifter. However, the present invention is characterized in that additional installation of the door device for opening and closing the open lower surface of the housing 10 in conjunction with the movement of the case 20 up and down.

The door device includes a guide hole 11 largely formed in the housing 10, a first guide post 40 reciprocating longitudinally along the guide hole 11, and the first guide post 40. And a pair of doors 50 rotatably installed on one side of the open surface of the housing 10 and the second guide post 45 and the second guide post 45 and the door 50. It consists of a wire (l) for connecting.

The guide hole 11 is a hole formed in a slit shape in the longitudinal direction on the side of the housing 10, the present invention proposed that a pair formed at the same position in both sides of the housing 10, that is, in a direction facing each other. . The guide hole 11 serves to constrain the moving distance and direction in the state where one end of the first guide post 40 to be described later is inserted, and is proportional to the rotation angle for opening and closing the door 50 to be described later. It is formed to have a length.

Meanwhile, the present invention shows that the guide hole 11 is formed in the longitudinal direction. However, the present invention is not limited thereto, and the first guide post 40 may be moved upward and downward. The formation angle or shape of the guide hole 11 may be modified.

The first guide post 40 is a member of a length member having a predetermined length, and both ends of the first guide post 40 are installed to be inserted into guide holes 11 formed on both sides of the housing 10. The first guide post 40 has a contact protrusion 41 protruding at a predetermined height toward the upper surface side of the case 20 at the center of the lower surface thereof, and the contact protrusion 41 at this time is moved up and down by the case 20. In contact with the first guide post 40 serves to elevate integrally.

Meanwhile, although the contact protrusion 41 is formed in the first guide post 40 in the present invention, as shown in the drawing, the first guide post 40 and the second guide post 45 are integrally formed. Since the contact protrusion 41 may be formed in the second guide post 45, the contact protrusion 41 may be provided. In addition, since the contact protrusion 41 is contacted during the lifting of the case 20, it is preferable to attach an elastic material to the contact surface or to apply a structure for cushioning to prevent noise and vibration caused by the contact impact force.

The second guide post 45 is coupled to one surface of the first guide post 40 configured as described above so as to cross-displace in a cross shape.

As shown in FIG. 7, the second guide post 45 is crosswise disposed at both ends of the first guide post 40. The second guide post 45 is disposed inside the housing 10 proximate to the guide hole 11. It is a structure provided. The second guide post 45 has a structure in which one end of the wire 1 is connected to both ends thereof, and the other end of the wire 1 is connected to one side of the door 50 to be described later.

The door 50 is connected to the wire l, so that the housing 10 is moved by the movement of the first guide post 40 and the second guide post 45 which interlock with each other as the case 20 moves up and down. The opening surface of the ceiling, that is to perform the operation of opening and closing the doorway formed on the ceiling.

The door 50 has a left and right symmetry and is hinged to the lower one side of the housing 10 so as to be rotatable, and the other end of the wire 1 is connected to the upper one side.

Referring to the operating state of the projector lifter according to the present invention configured as described above are as follows.

First, when the motor m generates the forward or reverse driving force by the user's switch operation, the rotation shaft ms rotates integrally with the driving of the motor m, and then the rotation of the rotation shaft ms As the pair of band wires (1) (w) is wound or unwound by the wires, the case 20 is interlocked to move up and down, and at the same time, the folding connector 30 is contracted or extended.

By such an operation, the case 20 is exposed to the outside of the housing 10 or received.

On the other hand, the door device is interlocked with the lifting and lowering movement of the case 20 to open and close the door 50.

That is, when the case 20 is lowered, the first guide post 40 having the contact support located on the upper surface of the case 20 moves downward in conjunction with the first guide post 40. ) Is lowered by the length of the guide hole 11 because both ends are inserted into the guide hole (11).

Accordingly, the second guide post 45 integrally provided with the first guide post 40 also moves downward, and the pair of doors 50 connected to the second guide post 45 and the wire 1 are also moved downward. As the wire 1 is loosened, it rotates around the hinge by its own weight to achieve an open state.

On the other hand, when the case 20 is moved up and down, if the case 20 is moved upward to some extent it is in contact with the contact protrusion 41 of the first guide post 40 in the lowered state, the case 20 The first guide post 40 and the second guide post 45 are raised and lowered by the lifting force of).

Therefore, as the second guide post 45 is elevated, the wire 1 is pulled to rotate the door 50 to shield the open surface of the housing 10.

On the other hand, Figures 8 to 9 is a side configuration view showing a second embodiment of the door device in the projector lifter according to the present invention, Figures 10 to 11 is a partial cutaway perspective view of Figure 8, as shown above All configurations are the same as the projector lifter of one embodiment, except that the main components constituting the door apparatus are different.

Therefore, in the description, the same components as the first embodiment of the present invention described above are denoted by the same reference numerals, and descriptions of the same components and operations will not be repeated.

As shown, the door 50 device according to the second embodiment is largely composed of a curve guide hole 12, a rotation link 47, a support portion 25 and the door 50.

The curve guide holes 12 are formed on the same line at regular intervals on one side of the housing 10 and have a predetermined curvature in a substantially vertical direction, and the sidewalls of the housing 10 on the basis of the formed target surfaces, respectively. It is formed at a position close to. The curve guide hole 12 serves to limit the rotational direction and the moving distance of the rotating link 47 to be described later, and is formed with a length proportional to the rotation distance opened in the state in which the door 50 is closed.

The rotating link 47 is a rod-shaped member having a predetermined length, one end of which is positioned between the pair of curve guide holes 12 and hinged on the housing 10 to be rotatably provided, and the other end of the rotating link 47. The protrusions inserted into the above-described curve guide hole 12 are formed.

That is, the rotation link 47 is inserted into the curved guide hole 12 having a constant curvature so that the other end can be rotated stably when the rotation link 47 rotates about the hinge, and the other end having the protrusion formed therein. The upper end of the wire (1) having a predetermined length extending downward is connected to.

On the other hand, the pivot link 47 is rotated around the hinge by contacting the support portion 25 installed on the upper surface of the case in which the projector is accommodated, the support portion 25 at this time is the pivot link ( 47), so as to support it in an eccentric position away from the center of gravity, i.e., close to the hinge side. This is to allow the rotary link 47 to move the other end downward by its own weight when the supporting portion 25 moves downward integrally with the case.

The support part 25 is a member for achieving stable contact while preventing the upper surface portion of the case from directly contacting the pivoting link 47, and can generally induce rolling contact upon contact with the pivoting link 47. It is preferably provided in the form of a circular pipe.

The door 50 is a member for selectively opening and closing the entrance side (opening the lower surface of the housing) of the ceiling, provided in a pair of left and right, as seen in the drawing, each lower side on both sides of the open surface of the housing 10 The hinge is rotatably coupled in the direction.

The door 50 has a configuration in which the lower end of the wire l is connected to one side of the upper surface close to the hinge, and the wire l moves up and down in conjunction with the rotation link 47 to ceiling. It will open and close the doorway.

The door 50 device according to the second embodiment of the present invention configured as described above, when the motor m generates a forward or reverse driving force by a user's switch operation, the rotation shaft ( ms) rotates integrally, and then the pair of band wires w are wound or unwound by the rotation of the rotational axis ms, and the case 20 interlocks up and down, and at the same time Folding connector 30 is to be contracted or stretched.

By such an operation, the case 20 is exposed to the outside of the housing 10 or received.

On the other hand, the door (50) device is interlocked with the lifting and lowering movement of the case 20 is made to open and close the door (50).

That is, when the case 20 is lowered, the contact portion supporting the lower end of the pivoting link 47 also moves downward integrally, so that the pivoting link 47 has the other end curved guide hole 12 around the hinge. Will move downward along.

Therefore, the pair of doors 50 connected to the other end of the rotational link 47 by the wires 1 are loosened as the other end of the rotational link 47 moves downward. It rotates about the hinge by its own weight, thereby achieving an open state.

On the other hand, when the case 10 is moved up and down, if the case 10 is moved upward to some extent, the supporting portion 25 provided on the upper surface is in contact with one end of the rotating link 47, the case ( As the rotary link 47 rotates about the hinge by the lifting force of 10), the other end moves upward, that is, the position returns.

Therefore, as the other end of the rotation link 47 is rotated upward, the wire 1 is pulled to rotate the door 50 to block the open surface of the housing 10.

On the other hand, Figures 12 to 13 is a side configuration view showing a third embodiment of the door device in the projector lifter according to the present invention, as shown therein, all configurations are the same as the above-described projector lifter of the first embodiment, but The main components constituting the door device are different.

Therefore, in describing the present embodiment, the same components as those of the first and second embodiments of the present invention described above are denoted by the same reference numerals, and redundant descriptions of the same configuration and operation will be omitted.

As shown in the drawing, the door device according to the third embodiment has a curved guide hole 12, a rotation link 47, a support part 25, a flexible door 55, a rotating roller r, and a wire l. It is composed.

The curve guide hole 12 is formed on the same line at regular intervals on one side of the housing 10, and is formed to have a predetermined curvature in the approximately vertical direction. The rotating link 47 is a rod-shaped member having a predetermined length, one end of which is positioned between the pair of curve guide holes 12 and hinged on the housing 10, and the other end thereof is the curve guide hole. It is a structure provided with the processus | protrusion inserted in (12).

In addition, the supporting portion 25 selectively contacting one end of the rotating link 47 is installed on the upper surface of the case, and these curve guide holes 12, the rotating link 47 and the supporting portion 25 are The structure is similar to that of the second embodiment described above.

The flexible door 55 is provided at the entrance side of the ceiling to be slidably moved to both sides, and is configured to be guided to the outer wall of the housing 10 inside the ceiling along the guider installed at the edge of the open surface side of the housing 10. do. These pairs of flexible doors 55 are preferably made of a plastic or metal material having excellent elasticity as a member of a flat plate.

On the other hand, the inside and the outside of the housing 10 has a structure in which a plurality of rollers (r) are rotatably installed at a position where position interference does not occur when the case 10 is raised and lowered.

The roller (r) is installed to switch the direction of the wire (l) connecting the rotary link 47 and the door 55, the wire (1) is one end of the other end of the rotary link 47 While being fixed to the end side inserted into the curved guide hole 12 is guided by a plurality of rollers (r) as shown in the drawing, one end thereof is connected to one end of the flexible door 55, the other end is opposed to It is a configuration connected to the other end of the other flexible door (55).

That is, a pair of wires (1) are all provided, and each wire (1) is connected to both ends of the pair of flexible doors 55 in a form where one end crosses each other. As shown in the figure, the pair of flexible doors 55 slide to both sides to open and close as the 47 is linked to the other end moving upward and downward about the hinge.

The door 55 device according to the third embodiment of the present invention, which is configured as described above, is made to move up and down of the projector lifter as in the first or second embodiment described above. Is operated to open and close the door 55.

At this time, the operation of the door device, when the case is lowered, since the contact portion supporting the lower end of the rotary link 47 moves downward integrally, the rotary link 47 has the other end around the hinge. The curved guide hole 12 moves downward.

Subsequently, when the other end of the rotation link 47 is rotated downward as shown in FIG. 13, the pair of doors 55 connected at both ends by the other end of the pivot link 47 and the wire 1 are connected to the door 55. One end of the side 55 (the left and right both ends in the drawing) is pulled out, resulting in an open state.

On the other hand, when the case is lifted, the other end of the door 55 is pulled, and as a result, the open surface of the housing 10 is blocked.

As described above, the projector lifter according to the first, second, and third embodiments of the present invention does not require a separate driving source, and the opening and closing operation of the door is performed only in conjunction with the lifting force of the case.

The present invention is not limited to the embodiments described, it is apparent to those skilled in the art that various modifications and variations can be made without departing from the spirit and scope of the present invention. Therefore, such modifications or variations will have to belong to the utility model registration claims of the present invention.

The projector lifter constructed and operated as described above does not require a separate power source because it opens and shields the open surface of the housing in conjunction with the lifting and lowering operation of the case. In particular, the projector's protection and interior interior are further improved. It provides a useful effect.

Claims (8)

A housing installed in the ceiling and open to the interior, a motor fixedly installed on one side of the housing to generate forward and reverse rotational forces, a rotation shaft pivoted on the motor, and a plurality of rollers rotatably installed on the upper side of the housing; One end is fixed to the rotating shaft and is selectively wound or unwound, and the other end is connected to the upper side of the housing along the roller, and the other end of the band wire is connected to the upper surface to be selectively inserted into the housing or interlocked by an interlocking operation. A projector that is exposed to the projector and is mounted therein, and a projector connected to both side walls of the housing and upper and lower ends of the housing, and a folding connector that is folded or unfolded in the vertical direction in conjunction with the case's lifting and lowering operation. In the lifter, A door device installed on one open side of the housing to selectively open and close an entrance and exit formed in a ceiling in association with a case; Projector lifter, characterized in that configured to include. The method of claim 1, wherein the door device, A pair of guide holes formed vertically in a direction facing each other on both sides of the housing; A first guide post having one end inserted into the guide hole and the other end extending horizontally to an upper side of the case; A second guide post having a central portion intersected and fixed to one side of an upper surface of the guide post, and having one end of a wire extending downwardly at both ends; A door that is rotatably installed at one side of the housing of the doorway side of the ceiling, and an upper end of which is connected to the other end of the wire; Projector lifter, characterized in that consisting of. According to claim 2, The door device, Both ends of the first guide post are inserted into the guide holes, and the second guide posts are provided in pairs at a predetermined interval, and the doors are provided in pairs to open and close the left and right sides. Projector lifter. 3. The projector lifter according to claim 2, wherein at least one of the first guide post and the second guide post has a contact protrusion for selectively contacting an upper surface of the case with a lower surface thereof. The method of claim 2, wherein the guide hole, Projector lifter, characterized in that the length is formed in proportion to the rotational distance is opened in the closed state. The method of claim 1, wherein the door device, A curved guide hole formed on one side of the housing to have a predetermined curvature in a substantially vertical direction with a predetermined distance from each other; Located at one side of each curve guide hole to rotate in conjunction with the case of lifting and lowering, one end is hinged on the housing and the other end is provided with a protrusion inserted into the curve guide hole, the one side of the protrusion is hung downward A rotational link to which the top of is connected; A support part selectively contacting one end of the pivoting link to be provided at a predetermined interval on the case; A pair of doors rotatably installed at one side of the housing at an entrance side of the ceiling and connected to a lower end of the wire to open and close in conjunction with an operation of a rotation link; Projector lifter, characterized in that consisting of. The method of claim 6, wherein the curve guide hole, Projector lifter, characterized in that the length is formed in proportion to the rotational distance is opened in the closed state. The method of claim 1, wherein the door device, A pair of curve guide holes formed in a vertical direction with a predetermined distance from one side of the housing; A pair of pivoting links having protrusions, one end of which is hinged between a pair of curve guide holes and the other end of which is inserted into each curve guide hole by pivoting when the case is moved up and down; A support portion provided at an upper portion of the case at a predetermined interval and selectively contacting one end of each of the pivot links; A pair of flexible doors provided at an entrance side of the ceiling and slidably moved to both sides and guided to an outer wall of the housing along a guider installed at one side of the housing; A plurality of rotating rollers rotatably installed at predetermined positions inside and outside the housing; A pair of one end is guided along the plurality of rotating rollers and fixed to one side of the projection link of each pivot link, one end is connected to one end of one flexible door, the other end is connected to the other end of the other flexible door that is opposed Wire; Projector lifter, characterized in that consisting of.