JP3448655B2 - Stage structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stage structure,
More particularly, the present invention relates to an improvement of a stage structure having an acoustic reflector device. [0001] 2. Description of the Related Art As a stage structure having an acoustic reflector device,
Has conventionally been disclosed, for example, in Japanese Utility Model Publication No. 55-30199.
Has been proposed. [0002] That is, the stage structure disclosed in the above publication has a ceiling structure.
The stage is set on a gate-shaped acoustic reflector where the sides and sides are integrated
Store in the storage area set at the back, and flat
Separate the acoustic reflector on the back side of the formation into the pit below the stage
It is configured to be stored in a different storage location.
You. [0003] Each acoustic reflector is provided at its lower end or the like.
Traveling on the floor of the stage by traveling means such as rotating wheels
It is set to be able to. In particular, the acoustic reflector on the back side is
The stage and the pit part according to the approaching stage set in the center etc.
Is set to go back and forth between storage locations. [0005] A gate stored in a storage location behind the stage
Type acoustic reflector allows storage in the so-called superposed state
Are formed in a similar shape as in
It is configured to be in a so-called extended state. Therefore, the stage structure disclosed in the above publication is not
When the acoustic reflector device is not used,
The firing plate can be stored in a predetermined storage location.
Thus, the stage can be used as a so-called stage. [0007] SUMMARY OF THE INVENTION
The conventional proposed stage structure has the following disadvantages:
Has been pointed out. That is, each acoustic reflector constituting the acoustic reflector device is
The firing plate is driven by running means such as wheels at the lower end etc.
Is it configured to be able to travel on the floor of the stage?
Then, the operator pushes each acoustic reflection plate, etc.
Location or storage location. However, each acoustic reflector is designed to reduce provisional weight.
Even if it is configured to have a significant weight
Is a common practice, so that the worker's so-called
There are disadvantages that are not easy. When each acoustic reflector moves, the acoustic reflector
Wheels, etc. that bear the weight of the reflector roll on the floor of the stage
Damage to the floor of the stage due to rolling of wheels etc.
There is an inconvenience that attachment is invited. Further, each of the above acoustic reflectors is provided below each of the acoustic reflectors.
Standing on the floor such as a stage by wheels etc.
Each acoustic reflector has a so-called height
Therefore, the center of gravity is high and it tends to be unstable, for example,
Individual or individual reflection of each acoustic reflector due to shaking during an earthquake, etc.
However, there is a disadvantage that all falls are feared. Further, to the floor of the stage by rolling of wheels and the like.
Rolling tracks such as wheels on the floor to prevent damage to the floor.
If an article is set up, the so-called stage between the stage and the approaching stage
There is an inconvenience that it is difficult to join seams. Further, for example, the rail is formed in a groove shape.
Small objects that fall into the rails may become obstacles.
And therefore hinder the movement of each acoustic reflector.
There is an inconvenience that it is easy to The present invention has been made in view of the above circumstances.
The purpose of the
It is easy to install and store the plate device,
It does not cause damage, and the acoustic reflector is
It is assumed that there is no fear of falling over and that the
It is to provide a stage structure that is optimal for [0015] The above object is achieved.
Therefore, the configuration of the stage structure according to the present invention,Appropriate driving machine
An upper floor that is formed to be ascendable in a tram and is set on the main stage,
Ascending by an appropriate drive mechanism while being arranged below the upper floor
Lower floor, which can be formed and set as a substage, and acoustic reflection
Ceiling-side acoustic reflectors and rear-side acoustic reflectors that make up the plate unit
A rear side acoustic reflector, comprising a launch plate and a side acoustic reflector.
And the side acoustic reflector is divided into upper and lower parts,
At least ceiling acoustic reflectors and rear acoustics on the underside of the floor
When the reflector and the upper half of the side acoustic reflector are held,
At least the rear acoustic reflector and the side
The lower half of the side acoustic reflector is erected, and the lower surface of the upper floor
Above the back and side acoustic reflectors held in
The back side acoustic reflector, half of which is erected on the lower floor, and
It is positioned inside the lower half of the side acoustic reflector Sea urchin
It can be lowered.In addition, the drive mechanism
Rack and pinion mechanism, chain drive machine
Construction or multi-stage hydraulic cylinder mechanism or multi-stage screw
One of the jacking mechanisms is selected. [0016] [Action] Therefore, the upper floor and the lower floor are lowered to predetermined positions.
By doing so, the acoustic reflector device is below the upper floor, that is,
It will be stored in the pit below the main stage,
At times, the upper floor becomes available as a so-called stage. Further, the upper floor and the lower floor are raised to predetermined positions.
Raising the acoustic reflector device between the upper and lower floors
At this time, the lower floor is the so-called stage
Will be available as The raising of the upper floor and the lower floor is performed by driving the drive mechanism.
Movement, that is, rack and pinion mechanism, chain drive
Eve mechanism or multi-stage hydraulic cylinder mechanism or multi-stage
With the drive of any selected mechanism of the cru jack mechanism
Is achieved. Also, the back side acoustic reflection plate and the side side acoustic reflection
The board is divided into upper and lower parts, and the upper half of each is held on the upper floor
The lower half of each is erected on the lower floor,
The storage height at the storage location can be set small. [0020] BRIEF DESCRIPTION OF THE DRAWINGS FIG.
The stage structure according to this embodiment is described in detail in FIG.
As shown in FIGS. 1 and 2, the upper floor 1 and the lower floor 2
Ceiling sound that constitutes the acoustic reflector device
Sound reflector 3, back side acoustic reflector 4, and side acoustic reflector 5
Having. The upper floor 1 is provided with an appropriate drive mechanism,
In the example, the rack and pinion mechanism 6 (see FIG. 1)
)), And as shown in FIG. 3,
Used as the main stage when descending to its predetermined position
Is set to The lower floor 2 is raised and lowered in the pit portion P.
Are arranged below the upper floor 1
However, an appropriate drive mechanism, that is, a chain
And is formed so as to be liftable by the
When ascending to a predetermined position (in the state shown in FIGS. 1 and 2),
It is set to be used as a stage. The upper floor 1 and the lower floor 2 are in the illustrated example.
Basically, each floor truss is shaped like a truss floor.
Floor boards 12, 22 laid on the upper ends of the frames 11, 21
It is formed in a state. On the other hand, the upper floor 1 is an example shown in FIG.
The left and right side edges inside are aligned below it
And is not supported by the standing guide post 13.
It is said that. The guide post 13 includes a plurality of post members.
(Not shown) so that it can expand and contract,
At the time of the maximum contraction, the upper floor 1 is maintained at the predetermined main stage position.
Is set to The guide post 13 is not shown.
However, at the time of its maximum extension,
Is provided. The lower end of the guide post 13 is
The bottom portion P is fixed to a bottom floor (not shown). On the other hand, the lower floor 2
Insert the guide post 13 into both end portions
When moving up and down in the pit portion P,
It is set to go up and down alongside the id post 13.
You. Therefore, in this embodiment, the upper floor 1
The guide post 13 bears the load from
The horizontal of the upper floor 1 and the lower floor 2 by the guide post 13
It is possible to prevent the swing in the direction. A load from the upper floor 1 will be described later.
If it can be borne by the
To prevent horizontal shaking by other appropriate means,
Needless to say, the guide posts 13 may be omitted from standing.
It is a theory. The upper floor 1 has a ceiling-side acoustic counter on its lower surface.
The shooting plate 3 is held in a suspended state, and in the illustrated example,
Also, the back side acoustic reflector 4 and the side acoustic reflector 5
The upper halves 4a and 5a are held in a suspended state. By the way, in the illustrated example, the back side acoustic
The reflection plate 4 and the side acoustic reflection plate 5 are each divided vertically.
Split into upper half 4a, 5a and lower half 4b, 5b
It has been said that. This is because the rear acoustic reflection plate 4 and the side acoustic
By dividing the reflector 5 into upper and lower parts,
The reflector 4 and the side acoustic reflector 5 are arranged in the pit portion P.
The storage height occupied when stored is the overall vertical length
This is because it can be set smaller. [0034]In addition,Back side acoustic counter held by upper floor 1
The upper half 4a, 5a of the shooting plate 4 and the armpit-side acoustic reflection plate 5 are shown in FIG.
In the illustrated example, the ceiling-side sound held on the upper floor 1
The sound reflectors are integrally connected to the reflectors 3 and are provided on each side.
Care is taken so that no gap is formed between 3, 4 and 5.
You. Here, the ceiling-side acoustic reflection on the upper floor 1
Upper half of plate 3, back side acoustic reflector 4 and side acoustic reflector 5
The holding structure of the sides 4a and 5a will be described briefly. First, the ceiling-side acoustic reflector 3 is held on the upper floor 1.
For example, in the illustrated example, a light truss
Suspension formed in a plate shape or the like and connected to the lower surface of the upper floor 1
Connect the ceiling acoustic reflector 3 to the frame 14
We are trying to establish. On the other hand, the hanging frame 14
The right and left ends and the left end in FIG. 2
Appropriate length at the side end, ie, the back side acoustic reflector 4 and the side
Corresponds to the longitudinal length of the upper half 4a, 5a of the acoustic reflector 5
Support frame part 15 formed in a columnar shape
It is said to have. The back of the support frame portion 15
The upper half 4a, 5 of the side acoustic reflector 4 and the side acoustic reflector 5
It is stated that a is continuously provided and held. The back side acoustic reflection plate 4 and the side side acoustic reflection plate
The upper half 4a, 5a of the shooting plate 5 is connected to the ceiling-side acoustic reflection plate 3.
The upper halves 4a, 5a have considerable self-supporting
If this is the case, this
Instead, the floor frame 11 or the hanging frame
Alternatively, it may be hung directly on the computer 14. In this case, the support frame portion 15
The formation of the upper floor 1
This is advantageous in that the weight of the device can be reduced. On the other hand, the lower floor 2 has a back on its upper surface.
The lower half 4b of the surface-side acoustic reflector 4 and the side acoustic reflector 5;
5b is erected. The back side acoustic reflector 4 and the side acoustic reflector
5, lower half sides 4b and 5b of the lower floor 2
When it is connected to the support frame 23 erected on the upper surface,
The support frame 23 has an appropriate length,
The length corresponding to the longitudinal length of the lower halves 4b, 5b
It is formed in a standing pillar shape. Note that the support frame 23 is
The support frame which is so-called upwardly positioned
In a so-called dodging state with respect to the part 15
Of course, it is positioned so as not to be. The back side acoustic reflector 4 and the side sounds
Even on the lower half side 4b, 5b of the sound reflecting plate 5,
Like the half sides 4a and 5a, both lower half sides 4b and 5b are integrated.
To reduce the gap and improve the sound effect.
Care is taken so that Next, the upper floor 1 and the lower floor 2 are raised,
The driving mechanism for raising and lowering will be briefly described. First, the driving mechanism for raising and lowering the upper floor 1 is as follows.
In the illustrated example, a rack and pinion mechanism 6 is provided.
And a rack shaft vertically erected on the lower floor 2 side
61, which is disposed on the upper floor 1 side and meshes with the rack shaft 61.
A pinion gear 62 and a pinion gear disposed on the upper floor 1 side.
A driving source 63 for rotating the antenna 62. In the illustrated example, the lower floor 2 is
A support frame 64 erected in the form of a pillar is provided on the upper surface.
The rack shaft 61 is held by the support frame 64.
It is going to be done. In the illustrated example, the upper floor 1 is a floor.
The left and right ends of the frame 11 in FIGS.
It has a leg frame 65 suspended in a columnar shape at the end,
The lower end of the leg frame 65 faces the rack shaft 61.
Side holds the pinion gear 62 and the drive source 63
ing. Therefore, the rack and pinion mechanism 6
According to the above, the pinion gear 62
Rotates and moves along the rack shaft 61, that is, moves up and down
In other words, the leg frame 65
Move up and down, that is, the upper floor 1 moves up and down with respect to the lower floor 2.
And Although not shown, the rack and pini
In the ON mechanism 6, the upper floor 1 is moved up and down to a predetermined position.
In such a case, the elevation of the upper floor 1 is stopped by using a sensor or the like.
It will be stopped until the next stop
Of course, it is configured to be held. On the other hand, the driving mechanism for raising and lowering the lower floor 2
In the illustrated example, it is assumed that the chain drive mechanism 7 is included.
Chain, which is vertically arranged on the so-called fixed side
71 and connected to the infinite chain 71 which is located on the lower floor 2 side
Coupler 72, which is disposed on the fixed side, and an infinite chain 7
And a driving source 73 for rotating the rotating member 1. The infinite chain 71 is shown in the illustrated example.
In the pit portion P, the so-called right and left sides in FIG.
Between the support parts 74 and 75 which are arranged in a fixed state up and down on the side.
It is said to be wound. The coupler 72 is provided in the illustrated example.
At the lower end of the floor 2 opposite to the endless chain 71
It is going to be kept. The driving source 73 is not shown in the illustrated example.
And installed at the center of the pit section,
The lower support 75 on which the chain 71 is wound
It is said that it is connected to a driver (not shown). Therefore, the chain drive mechanism 7
Then, the drive source 73 drives the infinite chain 71 to rotate.
To move the coupler 72, that is, to move the coupler 72 up and down.
And the lower floor 2 is in the pit section while
It will go up and down in P. Although not shown, this chain drive
Also in the mechanism 7, when the lower floor 2 is raised and lowered to a predetermined position.
In this case, the ascent and descent of the lower floor 2 is stopped by using a sensor or the like.
And the next stop is
It is configured to be maintained until it is. Therefore, this embodiment formed as described above
In the case of the stage structure according to the example, the use state (FIG. 1 and FIG.
The acoustic reflector device in the state shown in FIG.
In the case of storing in the upper part P, for example,
1 is driven by a rack and pinion mechanism 6 which is a driving mechanism.
Lower to a predetermined position. At this time, the lock on the guide post 13 is
Release the locking mechanism so that the guide post 13 can be contracted.
Of course. The lowering of the upper floor 1 constitutes the acoustic reflector device.
Of course, the ceiling acoustic reflector 3 is lowered.
Rear acoustic reflection connected to the ceiling acoustic reflector 3
The plate 4 and the upper half portions 4a, 5a of the armpit-side acoustic reflector 5
Descended. At this time, the upper halves 4a and 5a are
2 so-called inside of lower half portions 4b, 5b standing upright
Lowered as determined. The lowering of the upper floor 1 to a predetermined position is completed.
After that, a chain drive mechanism that drives the lower floor 2
7 to be lowered. At this time, as the lower floor 2 descends,
The floor 1 is of course lowered at the same time.
It goes without saying that the post 13 is contracted at the same time. When the lower floor 2 descends, the lower floor 2
A back side acoustic reflector 4 and a vertical acoustic reflector device.
And the lower half portions 4b and 5b of the side acoustic reflection plate 5 are
Of the projection plate 3, the back-side acoustic reflection plate 4, and the side-side acoustic reflection plate 5
It is lowered together with the upper halves 4a and 5a and stored in the pit portion P.
(See FIG. 3). With the above, the storage of the acoustic reflector device is completed.
In this embodiment, the rear acoustic reflection plate 4
And the storage height of the armpit-side acoustic reflector 5 is the upper half 4a, 5
a or the length corresponding to the longitudinal length of the lower half portions 4b and 5b.
Back side acoustic reflector 4 and side acoustic
The reflection plate 5 is an integral body that is not divided vertically.
Storage height compared to the storage height when storing
Height is smaller. Further, the sound reflecting plate device is provided below the upper floor 1.
The state is stored in the pit portion P (the state shown in FIG. 3).
At this time, the upper floor 1 becomes available for use as the main stage. When storing the acoustic reflection plate device,
Instead of the above, lower the lower floor 2 preferentially
Of course, in this case, the upper floor 1 is supported.
The lock mechanism of the held guide post 13 is released.
That the guide post 13 can be contracted.
It is a theory. On the other hand, contrary to the above, the acoustic
When using a firing plate device, reverse the above procedure
For example, preferentially, the lower floor 21
Is raised to a predetermined position by the drive of the chain drive mechanism 7.
Let Thus, an acoustic reflector device is constructed.
Lower half 4 of back acoustic reflector 4 and armpit acoustic reflector 5
b, 5b are arranged at predetermined positions. At this time, the upper floor 1 is simultaneously raised.
Of course, the guide post 13 is also extended.
Of course. Following the above, the upper floor 1 was
It is raised to a predetermined position by driving the
Back side that constitutes the acoustic reflector device together with the side acoustic reflector 3
Upper half portions 4a, 5a of the acoustic reflector 4 and the side acoustic reflector 5
At a predetermined position. Then, the upper floor 1 is raised to a predetermined position.
After that, the guide post 13 in the most extended state
Activate the lock mechanism and move the guide post 13
Fix the supporting state of the floor 1 and guide the load from the upper floor 1
The post post 13 is borne. Upward movement of upper floor 1 and lower floor 2 to predetermined positions
Is completed, the sound reflector device is ready for use.
At this time, the lower floor 2 can be used as a sub-stage.
become. FIG. 4 shows a stage according to another embodiment of the present invention.
1 shows the structure, in this embodiment, the upper floor 1 and
The drive mechanism for raising the floor and the lower floor 2 is a multi-stage hydraulic system.
It is characterized in that it is made up of the Linder mechanisms 8 and 9. The acoustic reflection plate device in this embodiment
The ceiling acoustic reflector 3, the back acoustic reflector 4, and so on.
And the configuration of the side acoustic reflectors 5 and the acoustic reflectors 3, 4,
About struggle between 5 and for each floor 1 and 2
Is the same as in the above-described embodiment. Therefore, in the following, except where necessary,
The main part of this embodiment will be described.
The same reference numerals in the drawings denote the same parts in the configuration.
And a detailed description thereof will be omitted. First, as shown in FIG. 4, the upper floor 1 is raised.
The multi-stage hydraulic cylinder mechanism 8 as a driving mechanism for
In the example, a guide formed in multiple stages
With a multi-stage hydraulic cylinder 82 housed inside
Do it. The multi-stage hydraulic cylinder 82 can be extended and contracted.
Of course, although not shown,
Supply by hydraulic pressure from a hydraulic supply
Lengthened and contracted by the discharge of the supplied hydraulic pressure
are doing. The multi-stage hydraulic cylinder 82 is
The upper end is connected to the lower surface of the upper floor 1, and the upper floor 1
It is said to be supported from below. The guide pipe 81 is a multi-stage hydraulic
It is formed so as to expand and contract following the expansion and contraction of the cylinder 82.
Buckling during the extension operation of the multi-stage hydraulic cylinder 82
It functions to prevent in advance. The upper end of the guide pipe 81 is shown
In the example, like the multi-stage hydraulic cylinder 82, the upper floor
1 is connected to the lower surface. The guide pipe 81 is not shown.
However, this should be supported by the so-called fixed side of the building.
In this way, the so-called falling down of the multi-stage hydraulic cylinder 82 is prevented.
It is said to prevent the so-called collapse. Next, a drive mechanism for raising the lower floor 2 is provided.
In this embodiment, the multi-stage hydraulic cylinder mechanism 9 is a multi-stage hydraulic cylinder mechanism.
It has a hydraulic cylinder 91. The multi-stage hydraulic cylinder 91 can be extended and contracted.
Although not shown, it is obvious that the
Like the stage hydraulic cylinder 82, it was installed at an appropriate location.
It is extended by the supply of hydraulic pressure from a hydraulic supply / discharge source,
It is said that it is contracted by the discharged hydraulic pressure. The multi-stage hydraulic cylinder 91 is
Bracket with its upper end standing on the lower floor 2
Suspending the lower floor 2 as being linked to the top side of 92
It is said to be supported by the embodiment. In this embodiment, the acoustic reflection
Back side acoustic reflection plate 4 and side acoustic reflection that constitute the plate device
The lower halves 4b, 5b of the plate 5 are connected to the bracket 92.
It is said that. Note that the multi-stage hydraulic cylinder 91 is
This is the lower floor unless the location is restricted.
2 may be disposed below the power supply, and in this case,
The operating force from the multi-stage hydraulic cylinder 91 acts directly on the lower floor 2.
This is advantageous in that it can be used. Therefore, according to this embodiment,
The floor 1 and the lower floor 2 are structurally formed to be heavy and heavy.
Even when it becomes difficult, the multi-stage hydraulic cylinders 82, 91
Error during extension operation
And the drive comprising the chain drive mechanism 7 described above.
Of the upper floor 1 and the lower floor 2
This is advantageous in that a trouble-free climb is possible. In this embodiment, too, the acoustic reflection plate
Back side acoustic reflector 4 and armpit side acoustic reflector 5 that constitute the device
Indicates that each is divided into upper and lower sides.
a, 5a are held on the upper floor 1 and the lower halves 4b, 5b
Needless to say, it is erected on the floor 2. In each of the above embodiments, the driving mechanism is
Rack and pinion mechanism selected
6, Chain drive mechanism 7 or multi-stage hydraulic cylinder
Mechanisms 8 and 9 are placed on any other of each mechanism.
Of course, it can be changed,
It may be replaced with a cru jack mechanism. The driving mechanism is a multi-stage screw jack.
If the key mechanism is selected, the upper floor
1 or lower floor 2 gradually descends from a predetermined position over time
Is advantageous in that inconveniences such as
You. [0091] As described above, according to the present invention,
The upper and lower floors are raised and lowered by
The ceiling-side acoustic reflector that constitutes the acoustic reflector device, the back
Move the side acoustic reflector and the side acoustic reflector up and down, that is, move
Installation and storage work of the acoustic reflector device because it is possible
At the time, the operator directly moves the acoustic reflector itself on each side
This eliminates the need to perform
You. Then, each of the side sounds constituting the acoustic reflector device.
Since the sound reflector itself is not moved directly, move the sound reflector.
Movement will damage the stage floor, etc.
The rails for moving the acoustic reflector have been set up.
There is also an advantage that it is not necessary to perform such operations. [0093] Each of the acoustics constituting the acoustic reflector device
The reflector is fixedly located on the upper or lower floor
So that it is easier to obtain so-called stability,
Individual or all of the acoustic reflectors on each side due to shaking
There is an advantage that there is no need to worry about falling. According to the present invention, the acoustic reflection plate device is provided.
Use the upper floor as the main stage when storing
When using the acoustic reflector device, the lower floor
Has the advantage that it can be used as a substage.
The acoustic reflector device is stored and the upper floor is used.
Has the advantage that the lower floor can be used during
You. Further, according to the present invention, the acoustic reflector device
The rear acoustic reflector and the side acoustic reflector that constitute
It is divided into upper and lower sides, and the upper half side is held on the upper floor
The lower half of each floor is erected on the lower floor,
The storage height when storing the sound reflector device is
On the upper half or lower half of the sound reflector and the side acoustic reflector
It can be set to the corresponding vertical length, the back side sound
A place to store the sound reflector and the side acoustic reflector as one
So-called space saving in storage area is possible
There are advantages. Then, the rear acoustic reflector and the side acoustic counter
The firing plate is divided into upper and lower parts, and the upper half is held on the upper floor and
When the half side is erected on the lower floor, the upper floor is lowered.
For example, you do not need to use a long stepladder, etc.
This makes it possible to replace the sound-absorbing material in the acoustic reflector.
There is a point, and at that time, the lower floor is also lowered and the sound
If the reflector device is in the stowed state,
There is also an advantage that the upper floor can be used as the main stage
is there. Further, the upper floor in the raised state is fixed.
If you use a guide post to maintain
The upper floor can be prevented from acting on the lower floor.
Therefore, the configuration of the drive mechanism for raising and lowering the lower floor
Advantages of easy lowering and lowering the floor
There is also. Further, the upper and lower floors are raised and lowered.
When the drive mechanism to be driven is appropriately selected, a predetermined so-called
Easily maintain durable positioning in place
There are also advantages.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front longitudinal sectional view showing a stage structure according to an embodiment of the present invention in a state where an acoustic reflector device is installed. FIG. 2 is a longitudinal sectional view of a side surface showing the stage structure of the embodiment of FIG. 1 in a state where an acoustic reflector device is installed. FIG. 3 is a half-section longitudinal sectional view on the front side showing the stage structure of the embodiment of FIG. 1 in a state where the acoustic reflector device is stored. FIG. 4 is a front half-section longitudinal sectional view showing a stage structure according to another embodiment of the present invention, similarly to FIG. 3; [Description of Signs] 1 Upper floor 2 Lower floor 3 Ceiling side acoustic reflector 4 Back side acoustic reflector 4a Upper half 4b of back acoustic reflector Lower side 5 of back acoustic reflector 5 Side acoustic reflector 5a Upper half side 5b of the side acoustic reflection plate Lower half 6 of the side acoustic reflection plate Rack and pinion mechanism 7 as a drive mechanism Chain drive mechanisms 8, 9 as a drive mechanism Multi-stage hydraulic cylinder mechanism P as a drive mechanism P pit portion

──────────────────────────────────────────────────の Continuation of the front page (51) Int.Cl. ⁷ identification code FI G10K 15/00 G10K 15/00 M (58) Field surveyed (Int.Cl. ⁷ , DB name) E04H 3/24 A63J 5 / 04 A63J 5/12

Claims (1)

(57) [Claims] [Claim 1] The main body is formed so as to be liftable by an appropriate driving mechanism.
An upper floor set on the stage, and arranged below the upper floor.
It is formed on the substage while being liftable by an appropriate drive mechanism.
The lower floor that is defined and the ceiling side sound that constitutes the acoustic reflector device
Sound reflector, rear acoustic reflector and armpit acoustic reflector
The rear acoustic reflector and the side acoustic reflector are vertically
While the lower surface of the upper floor
Well-side acoustic reflector, rear acoustic reflector, and side acoustic reflector
And the upper half of the
The lower half of the rear acoustic reflector and the side acoustic reflector
The rear acoustic counter is held on the lower surface of the upper floor.
The upper half of the launch plate and the side acoustic reflectors are erected on the lower floor.
The lower half of the rear acoustic reflector and the side acoustic reflector
Features that it can be lowered so that it can be positioned inside
Stage structure