JP2002356132A - On-vehicle large-sized screen display device and vehicle mounted with the device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an onboard large-sized screen display device and a vehicle mounted with the device capable of satisfying constraints of the gross weight of the vehicle and providing both elevating movement and rotational movement of a display part. SOLUTION: The on-vehicle large-sized screen display device 2 is provided with the display part 2a, an elevating mechanism 2b elevating the display part 2a on a loading space 3 of the vehicle 1, and a rotational mechanism 2c mounted on the elevating mechanism 2b and rotating the display part 2a on the loading space 3 around the elevating direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile large-screen display device for use in an event that provides video information to a large number of people in a wide area, such as a horse race, a concert, a speech, and the like. It relates to a vehicle equipped with this.

[0002]

2. Description of the Related Art Conventionally, a large screen display device called "Jumbotron" (registered trademark of Sony Corporation) is mounted on a carrier of a vehicle so as to be movable, and the display unit can be moved up and down on the carrier. For example, Japanese Patent Application Laid-Open No. 8-27231
The invention described in Japanese Patent Laid-Open No. 1 is known. On the other hand, there is also known a vehicle-mounted large-screen display device as described above, which is provided with a rotation mechanism for rotating the display unit.

[0003]

SUMMARY OF THE INVENTION A large screen display device comprises:
The weight of the display unit itself is large, and in addition to this, both the lifting and lowering mechanisms and the rotating mechanism use a hydraulic device as power, and the main material of the parts where the proof strength is required is steel, and in addition, Since many mechanical components are required, the total weight is considerably increased.

[0004] If the total weight of a vehicle equipped with a large screen display device is 8 tons or less, a driver with a normal license can drive the vehicle, and other tax and parking space is not required. The merit such as small turning is great. However, as described above, since the weight of the large screen display device is considerably large, it has been difficult to realize the 8 ton specification.

[0005] In addition, when performing two operations of raising and lowering and rotating the display unit, attention must be paid to the handling of cables for supplying control signals and power to the display unit. In other words, as the display unit moves up and down and rotates, the cable connected to this display unit performs a complicated movement combining vertical movement and rotation, especially when there are multiple cables, Interference with other components may damage the cable itself or, in some cases, hinder the lifting / lowering or rotating operation of the display unit.

[0006] Due to the above-described restrictions on the weight and the reason for arranging the cables, in the conventional large-screen display device, at present, either the lifting mechanism or the rotating mechanism is omitted.

[0007] The present invention has been made in view of the above problems, and can satisfy the restriction on the total weight of the vehicle.
It is an object of the present invention to provide a vehicle-mounted large-screen display device capable of performing both a lifting operation and a rotation operation of a display unit and a vehicle equipped with the same.

[0008]

According to a first aspect of the present invention, there is provided a large-screen display device for a vehicle, a display unit, an elevating mechanism for elevating the display unit on a bed of the vehicle, and elevating the display unit on the bed. And a turning mechanism for turning around the direction of.

[0009] With this configuration, if the display unit is raised by using the lifting mechanism, the screen can be easily viewed even by a spectator in the rear. When the vehicle is running, the display unit is lowered to a specified height or less, and the position of the center of gravity is set. It is possible to secure stable running by lowering it. In addition, since a rotating mechanism is also provided, the screen can be freely turned in a desired direction regardless of the parking direction of the vehicle.

[0010] In claims 8, 9, 20, 21 of the present invention,
The cable for supplying control signals and power to the display unit is
It is passed through the inside of a hollow inner mast fixed to a turntable rotatably installed on a loading platform, and is pressed against the inner peripheral surface of the inner mast by utilizing the flexibility of the cable to rotate together with the inner mast. The cable is movably housed inside the inner mast, and the cable derived from the inside of the inner mast has one end fixed to the inner mast and the other end slidably overlapping the outer side of the inner mast,
It is passed through a flexible cable case fixed to the outer mast that is raised and lowered by the hydraulic cylinder for lifting and lowering, and connected to the display unit attached to the outer mast. have.

In other words, when the cable is rotated, the cable rotates integrally with the inner mast and the outer mast, so that the cable does not swing or unfold, and only the portion protected by the cable case follows the elevating of the outer mast when ascending and descending. And only makes a movement that changes the amount of deflection in the vertical direction.

[0012] A vehicle according to a twelfth aspect of the present invention is a vehicle having a large screen display device mounted on a carrier, the large screen display device including a display unit, and an elevating mechanism for elevating the display unit on the carrier. And a rotating mechanism for rotating the display unit on the carrier in the direction of lifting and lowering.

[0013] With this configuration, if the display unit is raised by using the lifting mechanism, the screen can be easily viewed by a spectator in the rear. When the vehicle is running, the display unit is lowered to a specified height or less, and the center of gravity is positioned. And stable running can be ensured. In addition, since a rotating mechanism is also provided, the screen can be freely turned in a desired direction regardless of the parking direction of the vehicle.

In the vehicle according to the thirteenth aspect of the present invention, a control and operation equipment room is disposed between the front wheels and the loading platform, and the display unit is moved up and down near the rear wheels and substantially at the center in the width direction of the loading platform. A rotating mechanism is arranged so that the display unit is located on the opposite side to the generator arranged on one side in the width direction of the carrier during traveling.

By taking such an arrangement relationship, the load balance in the front-rear direction and the left-right direction of the vehicle can be determined by the standard, and a stable running and parking state can be ensured.

[0016]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic perspective view of a vehicle 1 equipped with a large screen display device 2 according to an embodiment of the present invention.
Shows a plan view of the vehicle 2, and FIG. 3 shows a left side view.

The large screen display device 2 is mounted on a carrier 3 of the vehicle 1 and is mounted on a vehicle. The basic configuration of the large screen display device 2 is a display unit (screen unit) 2a and the display unit 2a And a rotating mechanism 2c for rotating the display unit 2a on the carrier 3 in the vertical direction.

The display section 2a has a length of about 2.4 m and a width of 3.8 m.
It has a large screen of about 192 inches of about 4 m, and has a configuration using LEDs. The maximum weight of a vehicle that can be driven by a vehicle driver's license holder is 8 tons, and the height of the vehicle when stopped is 3.8 m or less. It is constrained. In consideration of the height of the tire, the height of the display section 2a is preferably about 2.4 m as described above, and it is necessary to suppress the height to about 2.5 m at the maximum.

Next, the rotation mechanism 2c will be described.

As shown in FIG. 1, the turning mechanism 2c mainly comprises a turntable 4 and a turning hydraulic cylinder 5 for turning the turntable 4. The turntable 4 has a circular shape, and is mounted on the carrier 3 so as to be rotatable around its central axis. Hydraulic cylinder for rotation 5
Is buried in the bed 3 below the turntable 4, and one end thereof is pivotally supported at the rear of the bed 3 so as to be swingable. The other end (the tip 5aa of the drive rod 5a) is connected to the turntable 4 at a predetermined position near the outer periphery of the turntable 4.

The connection relationship will be described with reference to FIG. 10. The U-shaped member 6 fixed to the lower surface of the turntable 4
, A pin 7 is fixed in the vertical direction, and the tip 5aa of the drive rod 5a is rotatably fitted to the pin 7.

When the drive rod 5a is in a contracted state (the state shown in FIG. 1), the display unit 2 supported on the turntable 4 via an inner mast 8 and an outer mast 9 described later.
a is located along the longitudinal direction on the left side of the bed 3, and when the drive rod 5a is extended, the turntable 4 rotates counterclockwise, and accordingly, the display unit 2a also rotates counterclockwise. Move. The position rotated by 90 ° is indicated by a two-dot chain line. The display unit 2a can be held at a desired rotation angle by controlling the flow rate of the oil supplied into the cylinder.

Next, the lifting mechanism 2b will be described.

The elevating mechanism 2b mainly includes an inner mast 8, an outer mast 9, and a hydraulic cylinder 10 for elevating. FIG. 5 shows the inner and outer masts 8,
9 is a front view (view from the left side of the vehicle 1), FIG. 6 is a side view (view from the rear side of the vehicle 1) of the inner and outer masts 8 and 9, and FIG. 7 is an inner and outer mast. Rear view of masts 8 and 9 (view from right side of vehicle 1)
8 is an enlarged plan view of the inner and outer masts 8 and 9 as viewed from above, and FIG. 9 is an enlarged perspective view of the upper part of the outer mast 9 alone.

The lower end of the inner mast 8 is fixed on the turntable 4, and together with the turntable 4,
The inner mast 8 rotates around a vertical axis. An outer mast 9 is slidably overlapped on the outer side of the inner mast 8 with respect to the inner mast 8. Outer mast 9
Is made of steel, whereas the inner mast 8 is made of stainless steel. The outer mast 9 is made of a steel material in order to reduce the cost. The inner mast 8 is made of a stainless steel because the inner mast 8 is exposed when the outer mast 9 is raised by the operation described later, so that the eyes of the audience can be seen. Since the outer mast 9 is provided (the outer mast 9 is inside the case body 11 containing the display unit 2a as shown in FIG. 1), the appearance of the design is improved and the inner mast 8 is attached to the inner mast 8 even if moisture adheres in rainy weather or the like. This is for maintaining the proof stress without generating rust.

As shown in FIG. 8, the inner mast 8 and the outer mast 9 are hollow with a rectangular cross section. By making the cross sections of the inner mast 8 and the outer mast 9 rectangular, the outer mast 9 can be prevented from rotating unnecessarily with respect to the inner mast 8, and the existing square tube column can be converted to be used at low cost. it can.

As shown in FIG. 8, at the four corners between the inner mast 8 and the outer mast 9, plate-like sliding members 12 made of a resin material are interposed. The sliding member 12 is fixed by bolts in surface contact with the inner surface of the outer mast 9,
The outer surface of the inner mast 8 is slidably in surface contact. By using such a sliding member 12, it is possible to reduce the weight and obtain high sliding performance as compared with the case where a ball bearing or a roller-shaped bearing is used.
In addition, the inner mast 8 and the outer mast 9 are made thinner to the extent that the required strength can be obtained in order to reduce the weight, and the strength is weakened. Excessive force does not act locally on the mast 8 and the outer mast 9 to prevent deformation and breakage. Further, as shown in FIGS. 5 to 7, even if the sliding member 12 is intermittently arranged in the height direction, sufficient sliding performance can be obtained, and cost reduction can be achieved without wasting the expensive sliding member 12. .

As shown in FIG. 8, the sliding member 12 on the back side of the inner mast 8 is fixed to the outer mast 9 via a spacer 13. Such a spacer 1
By interposing 3, a space s of a predetermined size is secured between the inner mast 8 and the outer mast 9 on the back side. In this space s, a cable case 14 described later
Is stored.

Next, the lifting hydraulic cylinder 10 will be described. As shown in FIG. 1, the lifting hydraulic cylinder 10 is disposed inside the inner mast 8 so as to extend in the vertical direction, and the lower end thereof is attached to the inner mast 8 via a mounting member 15.
It is fixed to.

As shown in FIG. 9, the lifting hydraulic cylinder 1
0 of the drive rod 10a is fixed to an angle member 17 via a pin 16, and the angle member 17 is connected to an outer member via three plate members 18a, 18b and 19 which form an inverted trapezoid together with the upper surface of the angle member 17. It is fixed to the mast 9. The plate members 18a, 18b and the angle member 17 are fixed by welding, and the plate members 18a, 18b and the plate member 19 are fixed to the upper end of the outer mast 9 by welding. As a result, the outer mast 9 moves up and down as the drive rod 10a moves up and down. Further, by supporting the outer mast 9 via the inverted trapezoidal member, even the thin outer mast 9 can be reliably and stably supported.

Next, as shown in FIG. 6, eight (four in FIG. 6 showing the left side) brackets 20a to 20d are provided on both sides of the outer mast 9 horizontally on the front side (display unit 2a side). It is attached so as to protrude. The display section 2a is provided on the outer mast 9 via the brackets 20a to 20d and the bracket 21 shown in FIG.
Is attached.

Next, as shown in FIG. 5 to FIG. 7, circular cutout holes (through holes) 23 are formed on the four side surfaces of the outer mast 9. On the front side shown in FIG. 5, two notch holes 23 are formed in a position not to be deviated left and right in the width direction and arranged in the height direction. The same applies to the back side shown in FIG. On the side surface shown in FIG. 6, the notch hole 23 is formed so as to be biased toward the back side in consideration of the strength required on the front side where the display unit 2a is mounted. As shown in FIG. 6, a U-shaped notch 22 is formed at the upper end of the outer mast 9, and a notch 24 is formed at the upper front side of the inner mast 8. The above-mentioned notch hole 23, U-shaped notch 22, and notch 24 are all formed for the purpose of reducing the weight together with the thickness reduction of the inner mast 8 and the outer mast 9. However, the display unit 2a has a sufficient strength against the weight, that is, the weight is reduced by providing as much and as large as possible in consideration of the safety in the mechanical strength of the inner mast 8 and the outer mast 9. I try to plan. The same applies to the setting for the wall thickness.

From the viewpoint of strength, it is not preferable to form a notch hole near a portion where the sliding member 12 which is a contact portion between the inner mast 8 and the outer mast 9 is attached. In the inner mast 8, a notch hole is formed in the side surface portion of the inner mast 8, instead of forming a notch hole in the side surface portion of the inner mast 8, except for a lower portion where the sliding member 12 is attached. The hole 23 is formed.

As shown in FIG. 6, two holes 25 for inserting fall-prevention safety pins are formed on both sides of the inner mast 8 in a line in the height direction. When the outer mast 9 is raised, if a pin is inserted into the hole 25 for safety, even if the pressure of the elevating hydraulic cylinder 10 drops for some reason and the outer mast 9 cannot be held, The lower end of the outer mast 9 catches on the pin inserted into the pin 25 to prevent the pin from falling. Thereby, safety can be ensured when a person performs inspection or work below the display unit 2a in a state where the display unit 2a is raised.

Next, power is supplied to the display unit 2a from the generator 30 shown in FIG. 2 via a switchboard provided in the control and operation equipment room 29. As a power supply means, a cable is used. Used. In addition to power, various control signals are sent from the control and operation equipment room 29 to the display unit 2a via a cable. These cables are passed through the inner mast 8 for accident prevention and design reasons. Note that two types of cables are used: a high-power cable that supplies power serving as a light emitting source of the LED and a low-power cable that supplies a control signal.

As shown in FIG. 5, the high-power cable 26a and the low-power cable 26b continuing from the control / operation equipment room 29 pass through the inside of the carrier 3 and through the opening formed in the turntable 4 to form the inner mast 8 Threaded inside. Inside the inner mast 8, the high-power cable 26 a and the low-power cable 26 b are housed by being pushed from above, so that the bent portion of the cable is pressed against the inner peripheral surface of the inner mast 8 as shown in the figure. Then, it is fixed to the inner mast 8. Therefore, when the inner mast 8 rotates, the inner mast 8 rotates integrally therewith. In addition, in order to allow this rotation, the cable for strong electricity 26a and the cable for weak electricity 26b near the entrance from below to the inner mast 8 are bent.

Referring also to FIG. 8, the high-current cable 26a and the low-current cable 26b led out of the inner mast 8 have one end fixed to the inner mast 8 via the bracket 27 and the other end connected to the inner mast 8. Bracket 2
8 through a cable case 14 which is fixed to the outer mast 9 and is made of a flexible and hard material.
a. The cable case 14 is accommodated in the space s between the rear side of the inner mast 8 and the outer mast 9 facing the inner mast 8 with a flexure amount that can follow the elevation of the outer mast 9 (U-shape in FIG. 5). It is the cable case 14 that hangs in the shape of a cable). Therefore, when the outer mast 9 is moved up and down, the cable case 14 follows the movement that changes the amount of bending in the space s.

Next, with reference to FIG. 2, the arrangement relationship of each component will be described.

A control / operation equipment room 29 is disposed between the front wheel FW (only the front wheel axle F is shown in FIG. 2) and the carrier 3 (behind the cab 31), and the rear wheel RW (the rear wheel axle R in FIG. 2). (Only shown) and an inner mast 8, an outer mast 9, a hydraulic cylinder 10 for elevating and lowering, and a turntable 4 are arranged substantially at the center in the width direction of the carrier 3. A generator 30 is disposed on one side (right side when viewed in the vehicle traveling direction) with respect to the width direction of the bed 3, and when the vehicle 1 is traveling, the display unit 2 a displays the bed 3 on the left side opposite to the generator 30.
Are arranged along the longitudinal direction. As shown in FIG. 4, the center axis Y of the inner mast 8 and the outer mast 9 is slightly shifted (about 50 mm) toward the vehicle rear side with respect to the axial position X of the rear wheel RW. By taking such an arrangement relationship, the front-rear and right-left load balance required by the standard for the vehicle can be satisfied, and stable traveling can be performed.

More specifically, the control / operation equipment room 29 has about 7
00 to 800 kg, generator 30 is about 1 ton, inner mast 8, outer mast 9, hydraulic cylinder 10 for lifting and lowering,
The lifting and lowering and rotating mechanism such as the turntable 4 is about 1.3 tons, the entire case body 11 including the display unit 2a is about 1.4 tons (the display unit 2a is about 480 kg), and the total weight of the entire vehicle 1 Is less than 8 tons.

In FIG. 2, in the case body 11,
Speakers 34a and 34b are provided on the left and right of the display unit 2a. Further, the case body 11 is also provided with shutters 33a and 33b for protecting the display unit 2a, and the shutters 33a and 33b are pulled out from the left and right and are aligned at the center of the display unit 2a. Further, an air intake opening 32 communicating with the inside of the case body 11 is formed in the carrier 3, a filter and a fan are attached to the air intake opening 32, and further, each unit 38 constituting the display unit 2 a is provided. Also, fans are mounted, and the driving of these fans causes the air intake openings 32 to be mounted.
Thus, the display unit 2a can be cooled by forming a flow of wind that passes through the display unit 2a. Each unit 38 has a through hole through which the wind can pass.

The control and operation equipment room 29 is provided with a door 37 for entering and exiting the control and operation equipment room 29. Further, as shown in FIG. 3, a window 35 for viewing an outside audience from the control / operation device room 29 is also provided. In the control / operation device room 29, operations on images projected on the display unit 2a are performed. As shown in FIG. 3, an antenna capable of receiving various broadcast radio waves can be attached to the ceiling of the vehicle 1.

The vehicle-mounted large-screen display device 2 according to the present embodiment and the vehicle 1 equipped with the same are configured as described above. Next, the operation thereof will be described.

To rotate the display section 2a, the drive rod 5a of the hydraulic cylinder 5 for rotation is extended and the turntable 4 is turned in an arbitrary direction (about 100
(Within 回 動 rotation range). At this time, the inner mast 8 and the outer mast 9 provided on the turntable 4 are both rotated. Since the high-current cable 26a and the low-current cable 26b are in pressure contact with the inner peripheral surface of the inner mast 8 and are fixed to the inner mast 8, they are not entangled or popped during the rotation operation and are damaged. In addition, there is no possibility that the rotary operation is hindered by being caught somewhere. By rotating the display unit 2a in this manner, the display unit 2a can be directed to the direction where the audience is within the rotation range regardless of the parking direction of the vehicle 1.

In order to raise the display section 2a, when the drive rod 10a of the hydraulic cylinder 10 for raising and lowering described above is operated in the extended state, the outer mast 9 is moved relative to the inner mast 8.
The display unit 2a attached to the outer mast 9 also rises together with the case body 11 containing it (the dashed line in FIG. 1 and the state shown in FIG. 4). At this time, the high-current cable 26a and the low-current cable 26b are protected by the cable case 14 and are housed in the space s so as to follow the up-and-down movement, so that there is no possibility of damage. Further, since no other components such as the hydraulic cylinder for lifting 10 are arranged in the space s, the cable case 14 smoothly follows the vertical movement without causing interference with other members. By raising the display unit 2a in this way, even if the audience stands in front of the display unit 2a, the audience is not obstructed, and the audience behind can see the lower side of the display unit 2a. In addition, the visibility of the screen can be improved.

Although the embodiments of the present invention have been described above, the present invention is, of course, not limited thereto, and various modifications can be made based on the technical concept of the present invention.

For the rotation mechanism, in addition to the configuration shown in the above embodiment, for example, teeth are formed on the outer peripheral surface of the turntable 4, and gears engaged with the teeth are driven to rotate using a hydraulic motor. With such a configuration, the rotation range is 360
The display portion 2a can be surely turned to the direction where the audience is located. In this case, all the constituent members such as the generator 30 which can be an obstacle are mounted on the turntable 4 and are rotated together. Note that the hydraulic motor is small and can produce a large output, and thus is suitable for use in the present invention.

[0049]

According to the first and twelfth aspects of the present invention, while the total weight of the vehicle can be kept within a desired weight (8 tons), any one of the lifting and lowering operation and the rotating operation of the display unit can be achieved. Is also possible. As a result, the parking direction and position can be freely set regardless of the direction of the vehicle within the turning range, and the display unit can be lowered during traveling to keep the height below the standard and perform stable traveling. In use, by raising the display unit, it is possible to make the screen easily viewable to a spectator behind.

According to the second and fourteenth aspects of the present invention, by using the driving force of the hydraulic cylinder having a simple structure, even a heavy one can be reliably rotated and held at a desired position. Great power can be obtained.

According to the third and fifteenth aspects of the present invention, by using the driving force of the hydraulic motor, which is small and capable of producing a large output, even a heavy one can be reliably rotated. A large holding force can be obtained.

According to the fourth, fifth, sixteenth and seventeenth aspects of the present invention, even a heavy object can be stably and reliably moved up and down, and the weight can be reduced by forming the notch hole.

According to the sixth, seventh, eighteenth, and nineteenth aspects of the present invention, the outer mast can be smoothly slid with respect to the inner mast, and is more advantageous in strength and lighter in weight than a ball bearing or the like. I can do it.

According to the eighth, ninth, twentieth and twenty-first aspects of the present invention, the display unit can be smoothly moved up and down and rotated without being hindered by the cable, and damage to the cable can be prevented.

According to the tenth, eleventh, twenty-second, and twenty-third aspects of the present invention, the cable case can be raised and lowered without causing interference with the lifting hydraulic cylinder and the cable in the inner mast.

According to the thirteenth aspect of the present invention, the front, rear, left and right load balance of the vehicle can be required according to the standard, and the vehicle can run stably.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view of a vehicle equipped with a large screen display device according to an embodiment of the present invention.

FIG. 2 is a plan view of the vehicle.

FIG. 3 is a side view of the vehicle.

FIG. 4 is a diagram showing a state where the display unit has risen from the state of FIG. 3;

FIG. 5 is a front view of an inner mast and an outer mast according to the present invention.

FIG. 6 is a side view of the inner mast and the outer mast.

FIG. 7 is a rear view of the inner mast and the outer mast.

FIG. 8 is an enlarged plan view of the inner mast and the outer mast.

FIG. 9 is a perspective view showing a connection relationship between the outer mast and a drive rod of a lifting hydraulic cylinder.

FIG. 10 is a schematic diagram showing engagement between a turntable according to the present invention and a drive rod of a hydraulic cylinder for rotation.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Vehicle, 2 ... Large screen display device, 2a ... Display part, 2b ... Elevating mechanism, 2c ... Rotating mechanism, 3 ... Carrying bed, 4 ... Turntable, 5 ... Hydraulic cylinder for rotation , 8 ... inner mast, 9 ... outer mast, 1
0 ... lift hydraulic cylinder, 12 ... sliding member, 14 ...
... Cable cases, 22, 23 ... Notch holes, 26a ...
... High-power cable, 26b ... Low-power cable, 29 ...
... control and operation equipment room, 30 ... generator.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Haruo Ikeda 6-7-35 Kita-Shinagawa, Shinagawa-ku, Tokyo Inside Sony Corporation (72) Inventor Yoshiaki Ishii 204 Totsuka-cho, Totsuka-ku, Yokohama-shi, Kanagawa Pref.・ S Co., Ltd. (72) Inventor Takao Ogawa 2-4-4-101 Haruno, Saitama, Saitama F-term (reference) 3D020 BA04 BB02 BC13 BD09 5G435 AA00 AA01 AA18 EE02 EE13 EE16 EE19 EE41 EE49 GG41 GG44 LL17

Claims (23)

[Claims] An on-board large-screen display device mounted on a bed of a vehicle and movable with the vehicle, comprising: a display unit; an elevating mechanism for moving the display unit up and down on the bed; A large-sized screen display device for a vehicle, comprising: a rotating mechanism configured to rotate on the carrier in the direction of the elevation. 2. The turntable, comprising: a turntable rotatably mounted on the loading platform for supporting the display unit; and a drive rod connected to the turntable, wherein the drive rod drives the turntable. 2. A rotating hydraulic cylinder for rotating the shaft.
2. A large screen display device for a vehicle according to claim 1. 3. The turn mechanism includes a turntable rotatably mounted on the carrier and supporting the display unit, a gear engaged with an outer peripheral surface of the turntable, and a rotational force applied to the gear. The on-vehicle large screen display device according to claim 1, comprising a hydraulic motor provided. 4. The elevating mechanism, comprising: a hollow inner mast fixed to the turntable; an outer mast slidably overlapping outside of the inner mast, and an outer mast to which the display unit is attached; The vehicle-mounted large-screen display device according to claim 2, comprising a lifting hydraulic cylinder for lifting and lowering, wherein a cutout hole is formed in the outer mast. 5. The elevating mechanism, comprising: a hollow inner mast fixed to the turntable; an outer mast slidably overlapping outside of the inner mast, and an outer mast to which the display unit is attached; The large screen display device for in-vehicle use according to claim 3, comprising a lifting hydraulic cylinder for lifting and lowering, wherein a cutout hole is formed in the outer mast. 6. A plate-like sliding member made of a resin material is interposed between the inner mast and the outer mast so as to make surface contact with both the inner mast and the outer mast. Item 5. An in-vehicle large-screen display device according to item 4. 7. A plate-like sliding member made of a resin material is interposed between the inner mast and the outer mast so as to be in surface contact with both the inner mast and the outer mast. Item 6. An in-vehicle large screen display device according to item 5. 8. A cable for supplying a control signal and power to the display unit is passed through the inner mast, and is pressed against an inner peripheral surface of the inner mast by using the flexibility of the cable. The cable which is rotatably housed inside the inner mast together with the inner mast, and the cable led out from the inside of the inner mast has one end fixed to the inner mast and the other end fixed to the outer mast. 5. The flexible cable case, wherein the cable case is connected to the display unit, and the cable case has a bending amount capable of following up and down movement of the outer mast. Large screen display device for in-vehicle use. 9. A cable for supplying a control signal and power to the display unit is passed through the inner mast, and is pressed against an inner peripheral surface of the inner mast by utilizing the flexibility of the cable. The cable which is rotatably housed inside the inner mast together with the inner mast, and the cable led out from the inside of the inner mast has one end fixed to the inner mast and the other end fixed to the outer mast. The flexible cable case passes through the flexible cable case and is connected to the display unit, and the cable case has an amount of bending that can follow the elevation of the outer mast. Large screen display device for in-vehicle use. 10. The large screen display device according to claim 8, wherein the cable case is accommodated in a space between the inner mast and the outer mast. 11. The on-vehicle large screen display device according to claim 9, wherein the cable case is accommodated in a space between the inner mast and the outer mast. 12. A vehicle having a large screen display device mounted on a carrier, wherein the large screen display device includes a display unit, an elevating mechanism for elevating the display unit on the carrier, and the display unit comprising the carrier. And a turning mechanism for turning the upper and lower parts about the direction of elevation. 13. A control / operation device room is disposed between a front wheel and the loading platform, and the lifting / lowering and rotating mechanism is disposed near a rear wheel and substantially at a center position in a width direction of the loading platform. 13. The vehicle according to claim 12, wherein the display unit is sometimes located on the opposite side to the generator arranged on one side in the width direction of the bed. 14. A turntable rotatably mounted on the carrier and supporting the display unit, a driving rod is connected to the turntable, and the turntable is driven by driving the drive rod. 2. A rotating hydraulic cylinder for rotating the shaft.
3. The vehicle according to 2. 15. A turntable rotatably mounted on the carrier to support the display unit, a gear engaged with an outer peripheral surface of the turntable, and a rotational force applied to the gear. 13. The vehicle according to claim 12, comprising a hydraulic motor provided. 16. The lifting mechanism, comprising: a hollow inner mast fixed to the turntable; an outer mast slidably overlapping outside of the inner mast, and an outer mast to which the display unit is attached; The vehicle according to claim 14, comprising a lifting hydraulic cylinder for lifting and lowering, wherein a cutout hole is formed in the outer mast. 17. The elevating mechanism, comprising: a hollow inner mast fixed to the turntable; an outer mast slidably overlapping outside of the inner mast, and an outer mast to which the display unit is attached; The vehicle according to claim 15, comprising a lifting hydraulic cylinder for lifting and lowering, wherein a cutout hole is formed in the outer mast. 18. A plate-like sliding member made of a resin material is interposed between the inner mast and the outer mast so as to make surface contact with both the inner mast and the outer mast. Item 18. The vehicle according to Item 16. 19. A plate-like sliding member made of a resin material is interposed between the inner mast and the outer mast so as to be in surface contact with both the inner mast and the outer mast. Item 18. The vehicle according to Item 17. 20. A cable for supplying a control signal and electric power to the display unit, passes through the inner mast, and is pressed against the inner peripheral surface of the inner mast by utilizing the flexibility of the cable. The cable, which is rotatably housed inside the inner mast together with the inner mast, and has one end fixed to the inner mast and the other end fixed to the outer mast, extending from the inside of the inner mast 17. The flexible cable case, wherein the cable case is connected to the display unit, and the cable case has a flexure amount capable of following up and down movement of the outer mast. Vehicle. 21. A cable for supplying a control signal and electric power to the display unit, passes through the inner mast, and is pressed against the inner peripheral surface of the inner mast by using the flexibility of the cable. The cable which is rotatably housed inside the inner mast together with the inner mast, and the cable led out from the inside of the inner mast has one end fixed to the inner mast and the other end fixed to the outer mast. 18. The flexible cable case is connected to the display unit through the flexible cable case, and the cable case has an amount of bending that can follow the elevation of the outer mast. Vehicle. 22. The vehicle according to claim 20, wherein the cable case is accommodated in a space between the inner mast and the outer mast. 23. The vehicle according to claim 21, wherein the cable case is accommodated in a space between the inner mast and the outer mast.