JP7555566B2 - Stretchable Sound Absorbing Panel - Google Patents

Description

The present invention relates to a stretchable sound-absorbing panel that can be opened and closed by folding or stretching horizontally.

Our company has made various inventions based on the knowledge that a device with extremely high sound absorbing performance can be constructed by placing a sound insulating panel behind a sound absorbing panel with an air layer between them (for example, Patent Documents 1 and 2). For example, we have proposed a single panel structure like a partition (Patent Document 1) and a structure in which a sound absorbing panel is hung from a rail like a vertical blind (Patent Document 2).
There have been various proposals for accordion panels and accordion doors that use a pantograph-like mechanism to expand and contract their length (Patent Documents 3 and 4). These aim to improve operability when opening and closing (Patent Document 3) or to eliminate disturbance of the screen when folding, allowing for smooth folding (Patent Document 4).

JP 2009-264029 A JP 2012-202197 A JP 2010-77709 A Utility Model Registration No. 3216491

All of the above-mentioned conventional proposals for accordion-type panels were proposals for opening and closing mechanisms, and accordion-type panels were simply positioned as devices for dividing spaces. As a result, there were no proposals that added new functionality to accordion-type panels. Furthermore, even if there was conventional technology to promote sound-absorbing effects in accordion-type panels, this was merely the sound-absorbing effect of the material stretched over the surface itself, and there was no device in particular in which the materials stretched over both surfaces worked together to achieve sound-absorbing effects throughout the entire accordion-type panel.

This invention solves the above problem by fixing a first sheet with sound absorbing properties and a second sheet with sound insulating properties to the support with their inner faces facing each other and with an air gap between them.

In other words, this invention provides an expandable sound-absorbing panel characterized in that both end edges of a flexible first sheet and both end edges of a flexible second sheet are attached in the direction of distance L10 between a first support and a second support arranged in parallel with each other at a distance L10, with their inner surfaces facing each other in the direction of distance L10, and configured as follows:
(1) The first and second supports are connected by an extension mechanism that maintains them parallel to each other and enables them to move to a maximum distance L10 and a maximum distance L20.
(2) The first sheet is made of a material having sound absorbing properties, the second sheet is made of a material having sound insulating properties, and an air layer is always formed between the inner surface of the first sheet and the inner surface of the second sheet.
(3) The first sheet and the second sheet are attached to the supports so as to maintain the air layer without sagging in response to the change in the distance between the supports due to the contraction of the telescopic mechanism.
(4) An extension mechanism is disposed between the inner surface of the first seat and the inner surface of the second seat, and the extension mechanism is configured by connecting a main extension mechanism that opens and closes horizontally in a pantograph-like manner and a guide extension mechanism that opens and closes vertically in a pantograph-like manner.
(5) The main telescopic mechanism is configured by arranging rotatable connecting rods in an X-shape around an inner pin so that the main telescopic parts are aligned in a straight line, and each connecting rod is rotatably connected to both ends of adjacent main telescopic parts by an outer pin.
(6) The guide telescopic mechanism is configured by arranging rotatable connecting rods in an X-shape around an inner pin and arranging the guide telescopic parts in a straight line, and by rotatably connecting each connecting rod at both ends of adjacent guide telescopic parts with an outer pin.
(7) Each inner pin of the main telescopic mechanism is connected to one outer pin of the guide telescopic part.

Furthermore, in the above-mentioned invention, there is provided a stretchable sound-absorbing panel formed as follows.
(1) The first sheet and the second sheet are formed with numerous folds parallel to the axial direction of the support pillars, and are structured so that when the distance between the support pillars is at its shortest, L20, the two sheets are folded individually and do not come into contact with each other.
(2) The first sheet is constructed by laminating a flexible sound absorbing material on the inner surface of a flexible surface member having a large number of minute gaps that allow air to pass through.

In this invention, a first sheet with sound absorbing properties and a second sheet with sound insulating properties are attached to the support with their inner faces facing each other with an air layer between them, so that sound entering from the first sheet side is absorbed by the sound absorbing material of the first sheet, passes through the air layer, is reflected by the second sheet with sound insulating properties, and passes through the air layer again to reach the first sheet side. Therefore, the expandable sound absorbing panel of this invention has the effect of successfully reducing noise generated on the sound absorbing side.
Furthermore, even if the distance between the supports expands and contracts between L20 and L10, the first and second sheets do not bend and the air layer can be maintained. Therefore, with the expandable sound-absorbing panel of this invention, even if the width is changed between the distance between the supports, i.e., between L20 and L10, the sound-absorbing effect achieved by the combination of the first sheet (sound absorption), air layer, and second sheet (sound insulation) can be maintained.

1A is a plan view of the elastic sound-absorbing panel of the present invention in a closed state, FIG. 1B is a front view, and FIG. 1C is a right side view. 1A and 1B are a plan view and a front view, respectively, of a stretchable sound-absorbing panel of the present invention in an open state, respectively, and FIG. FIG. 2 is a schematic diagram of a sound absorbing sheet and a sound insulating sheet of the stretchable sound absorbing panel of the present invention, showing a part of an enlarged plan view in an open state. 1 is a schematic partial enlarged plan view of the main telescopic mechanism of the telescopic sound absorbing panel of the present invention in an open state; 1 is a schematic diagram of a guide telescopic mechanism of the telescopic sound absorbing panel of the present invention, partially illustrating an enlarged plan view in an open state. 2 is a schematic representation of another expandable acoustical panel of the present invention in an enlarged plan view in a partially open position;

The expandable sound-absorbing panel 60 of this invention is constructed by connecting the posts 20, 20 with an expandable mechanism 50 that can hold them at any distance, and attaching a sound-absorbing sheet 1 to one side of the expandable mechanism 50 and a sound-proof sheet 10 to the other side (Figs. 1 and 2).

1. Structure of sound-absorbing sheet 1 and sound-proof sheet 10

(1) The sound-absorbing sheet (first sheet) 1 is constructed by layering a sound-absorbing member 6 made by compressing a fiber material and forming it into a felt-like shape over almost the entire surface (inner surface) 4 of a surface member 3 formed by weaving resin fibers (Figure 3). Because the surface member 3 is made of woven resin fibers, gaps are formed between the fibers, allowing sound to pass through the gaps.

(2) The sound-proofing sheet (second sheet) 10 is the same size as the sound-absorbing sheet 1, is made of a resin sheet material, and is structured so that sound cannot pass between one surface 11 and the other surface 11a (in the thickness direction) (Figure 3).

(3) Both the sound absorbing sheet 1 and the sound insulation sheet 10 are made of a flexible material, for example, a material that has a property of being freely foldable along a set folding line. Therefore, the sound absorbing material 6 of the sound absorbing sheet 1 is also made of a flexible material that can be folded in accordance with the folding of the surface member 3.
In addition, mounting tape 31 for attaching an expansion mechanism 50 is attached to one side 2 of the sound-absorbing sheet 1 (i.e., the side of the sound-absorbing material 6) and one side 11 of the sound-proof sheet 10 at the top and bottom in the height direction and over almost the entire length in the width direction (Figure 3).

2. Support 20

(1) Two pillars 20, 20 are arranged opposite each other, one of which is the first pillar 20A and the other the second pillar 20B. Both the first pillar 20A and the second pillar 20B are configured by connecting a leg 25 to the lower end of the pillar body 21. The pillar body 21 has a recess 22 formed on the surface facing the other pillar, which extends over almost the entire height in the height direction. The height of the pillar body 21 is formed to be greater than the heights of the sound absorbing sheet 1 and the sound insulating sheet 10 so that the entire sound absorbing sheet 1 and the sound insulating sheet 10 can be held.

(2) Magnets 23, 23 are attached to the surface opposite the opposing surface of the support body 21 to connect to the support 20 of another expandable sound-absorbing panel 60. In addition, rollers 26 are attached to the bottom surface of the leg 25 so that the expandable sound-absorbing panel 60 can be moved (Figures 1 and 2).

(3) Although the supports 20, 20 are mainly assumed to be made of aluminum or other moldings, the material and structure can be arbitrary as long as they can hold the expansion mechanism 50, the sound-absorbing sheet 1, and the sound-proof sheet 10.

3. Telescopic mechanism 50

(1) The telescopic mechanism 50 is configured by connecting the main telescopic mechanism 30, which opens and closes like a pantograph in the horizontal direction, to the guide telescopic mechanism 40, which opens and closes like a pantograph in the vertical direction (Figure 2), and is provided at the top and bottom in the height direction between the pillars 20A and 20B (Figure 2).

(2) Two connecting rods 31, 31 are arranged in an X-shape, an inner pin 33 is attached to the center of the X-shape (the center of the connecting rods 31, 31), and the connecting rods 31, 31 are formed to be freely rotatable around the inner pin 33 to form the main telescopic part 32. A large number of main telescopic parts 32, 32 are arranged in parallel so that their inner pins 33 are aligned in a straight line, and the free ends of the abutting connecting rods 31, 31 of adjacent main telescopic parts 32, 32 are connected to each other by the outer pin 35 so that they can freely rotate with each other to form the main telescopic mechanism 30. In other words, the main telescopic mechanism 30 has a structure in which so-called pantograph shapes are connected in a row.
A half connecting rod 37 is formed with half the length of the connecting rod 31, and one end of the half connecting rod 37 is connected to each of the connecting rods 31, 31 at both ends of the main telescopic mechanism 30 by outer pins 35, 35 so as to be freely rotatable with each other. At both ends of the main telescopic mechanism 30, the other ends of the two connected half connecting rods 37, 37 are overlapped and connected by end inner pins 33a (FIG. 4).
Therefore, the main extension mechanism 30 is configured to be able to freely extend and retract within one plane between the end inner pins 33a, 33a which correspond to both ends in the longitudinal direction.

(3) Similarly, two connecting rods 41, 41 are arranged in an X-shape, an inner pin 43 is attached to the center of the X-shape (the center of the connecting rods 41, 41), and the connecting rods 41, 42 are formed to be freely rotatable around the inner pin 43 to form a guide telescopic part 42. A large number of guide telescopic parts 42, 42 are arranged in parallel so that their inner pins 43, 43 are aligned in a straight line, and the free ends of the abutting connecting rods 41, 41 of adjacent guide telescopic parts 42, 42 are rotatably connected to each other by outer pins 45, 45 to form a guide telescopic mechanism 40. In other words, the guide telescopic mechanism 40 has a structure in which so-called pantograph shapes are connected in a row.
Therefore, the guide extension/retraction mechanism 40 is configured to be able to freely extend and retract within one plane between the end outer pins 45, 45 (end outer pins 45a, 45a) at one end in the longitudinal direction and the end outer pins 45, 45 (end outer pins 45a, 45a) at the other end.

(4) Prepare the same number of vertical rods 51, 51 as the pillar body 21 and the outer pins 35 of the main telescopic mechanism 30. Arrange the main telescopic mechanism 30 so that the connecting rods 31, 31 are aligned horizontally (so that the connecting rods 31 open, close, and expand horizontally), line up the two main connecting mechanisms 30, 30 vertically at a predetermined interval, and arrange the vertical rods 51 at the positions of the outer pins 35, 35. In other words, the main telescopic mechanisms 30, 30 are arranged at the upper and lower ends of each vertical rod 51, and each vertical rod 51 is connected to the corresponding outer pin 35.
A guide telescopic mechanism 40 is arranged below the upper main telescopic mechanism 30 so that its connecting rods 41, 41 are aligned vertically (so that the connecting rods 41, 41 open/close and telescopic in the vertical direction). The outer pins 45, 45 located on the upper side of the guide telescopic mechanism 40 are connected to the inner pins 33, 33 of the main telescopic mechanism 30. Therefore, the outer pins 45, 45 located on the lower side of the guide telescopic mechanism 40 are not connected and are in a free state, and the outer pins 45, 45 at both ends of the guide telescopic mechanism 40 are called end outer pins 45a, 45a. Therefore, the upper main telescopic mechanism 30 and the one guide telescopic mechanism 40 attached below it telescopically extend and retract in conjunction with each other.
Similarly, another guide extension mechanism 40 is arranged above the lower main telescopic mechanism 30 so that its connecting rods are aligned vertically (so that the connecting rods 41, 41 open, close, and extend vertically). The outer pins 45, 45 located on the lower side of the guide extension mechanism 40 are connected to the inner pin 33 of the main telescopic mechanism 30. Therefore, the outer pins 45, 45 located on the upper side of the guide extension mechanism 40 are not connected and are in a free state, and the outer pins 45, 45 at both ends of the guide extension mechanism 40 are called end outer pins 45a, 45a. Therefore, the lower main telescopic mechanism 30 and the other guide extension mechanism 40 attached above it extend and retract in conjunction with each other.

(5) In this manner, the extension mechanism 50 is constructed.

4. Structure of the stretchable sound-absorbing panel 60

(1) Two insertion square members 53 that are long in the vertical direction (≒H1) and can be inserted into the recesses 22 of the pillars 20A and 20B are arranged vertically with a gap between them, and the extension mechanism 50 (main extension mechanism 30, guide extension mechanism 40) is arranged between the two insertion square members 53, 53.
The inner end pins 33a of the two main telescopic mechanisms 30 are rotatably connected to the opposing surfaces of the two insertion beams 53 (FIG. 4). Also, in accordance with the position of the guide telescopic mechanism 40, the receiving metal fittings 55 with vertically long holes are fixed, and the outer end pins 45a of the guide telescopic mechanism 40 are slidably connected to the vertically long holes of the receiving metal fittings 55 (FIG. 5).

(2) The sound-absorbing sheet 1 is placed on one outer surface of the telescopic mechanism 50, with its sound-absorbing member 6 facing the telescopic mechanism 50, by folding it in a zigzag shape along the outer edges of the connecting rods 31, 31 of the main telescopic mechanism 30 of the telescopic mechanism 50, and the vertical edges at both ends of the sound-absorbing sheet 1 are held by the inserted square bars 53.
Similarly, the sound-proofing sheet 10 is folded in a zigzag shape along the outer edges of the connecting rods 31, 31 of the main telescopic mechanism 30 of the telescopic mechanism 50, and the vertical edges at both ends of the sound-proofing sheet 10 are held by the inserted square bars 53.
Furthermore, the mounting tapes 18 of the sound absorbing sheet 1 and the sound insulating sheet 10 are arranged by the expansion mechanism 50 in accordance with the height positions of the main expansion mechanisms 30 above and below, and the mounting tapes 18 are attached to the connecting rods 31, 31 and the half connecting rods 37 of the main expansion mechanism 30. This allows the sound absorbing sheet 1 and the sound insulating sheet 10 to be folded in accordance with the expansion and contraction of the expansion mechanism 50, i.e., the rotation of the connecting rods 31 and the half connecting rods 37. Therefore, there is no risk that the sound absorbing sheet 1 and the sound insulating sheet 10 will sag away from the expansion mechanism 50 even when the expansion and contraction of the expansion mechanism 50 occurs, and further, one surface (inner surface) 2 of the sound absorbing sheet 1 and one surface (inner surface) 11 of the sound insulating sheet 10 can be prevented from approaching each other, and a stable air layer 15 can be formed (FIGS. 2(a), 3, 4).
In addition, the sound absorbing sheet 1 and the sound insulating sheet 10 are bent relatively gently at the inner pin 33 of the main extension mechanism 30, and are arranged apart from the inner pin 33 (FIG. 3). Therefore, the distance between the sound absorbing sheet 1 and the sound insulating sheet 10 can be prevented from becoming closer than the distance L0 (FIG. 3).

(3) As described above, the insert square member 53 to which the expansion mechanism 50, the sound absorbing sheet 1, and the sound insulation sheet 10 are fixed is inserted and fixed into the recesses 22 of the supports 20A and 20B, and the expansion mechanism 30, the sound absorbing sheet 1, and the sound insulation sheet 10 are attached to the supports 20A and 20B to form an expansion sound absorbing panel 60 (Figs. 1 and 2). Since the expansion mechanism 30 is present over the entire width between the sound absorbing sheet 1 and the sound insulation sheet 10, one side 2 (inner surface, sound absorbing material 6 side) of the sound absorbing sheet 1 and one side 11 (inner surface) of the sound insulation sheet 10 do not come into contact with each other, and an appropriate air layer 15 is always formed. In addition, since the sound absorbing sheet 1 is attached to one side of the insert square member 53 and the sound insulation sheet 10 to the other side, the other side 2 (inner surface, sound absorbing material 6 side) of the sound absorbing sheet 1 and one side 11 (inner surface) of the sound insulation sheet 10 do not come into contact with each other even in that position.

5. Use of expandable sound-absorbing panels 60

(1) The expandable sound-absorbing panel 60 can be used as a partition or the like by selecting an appropriate width between the maximum length L10 (FIG. 2) and the minimum length L20 (FIG. 1) between the supports 20A and 20B. The minimum width L20 is convenient for storage as it reduces the planar area (FIG. 1).
Therefore, the width of the sound absorbing sheet 1 and the sound insulation sheet 10 are arranged without sagging along the outer surfaces of the connecting rods 31, 31 of the main telescopic mechanism 30 when the distance between the supports 20A, 20B is length L10. Also, the sound absorbing sheet 1 and the sound insulation sheet 10 are arranged so as to be folded without sagging along the outer surfaces of the connecting rods 31, 31 of the main telescopic mechanism 30 when the distance between the supports 20A, 20B is length L20. Therefore, the width and thickness of the sound absorbing sheet 1 and the sound insulation sheet 10 are formed under these conditions.

(2) By extending the distance between the posts 20A, 20B and positioning the sound-absorbing sheet 1 toward the noise source, the sound of noise leaking outside the sound-proof sheet 10 can be reduced.
That is, part of the sound that reaches the stretchable sound-absorbing panel 60 is absorbed by the surface member 3 of the sound-absorbing sheet 1, and part of the sound components that pass through the gaps between the fibers of the surface member 3 are attenuated by the fiber material of the sound-absorbing member 6. The sound components that pass through the sound-absorbing member 6 pass through the air layer 15, are reflected by the inner surface of the sound insulation sheet 10, pass through the air layer 15 again, and are attenuated by the fiber material of the sound-absorbing member 6 of the sound-absorbing sheet 1. The sound is also absorbed by the fibers of the surface member 3 of the sound-absorbing sheet 1, and reaches the sound-absorbing sheet 1, and through the above process, the generated sound is significantly attenuated.
In this case, even if a noise source is present on either the sound absorbing sheet 1 side or the sound insulation sheet 10 side of the expandable sound absorbing panel 60, sound leaking to the other side sandwiched between the expandable sound absorbing panel 60 can be reduced depending on the sound insulation performance of the sound insulation sheet 10.

(4) When the distance between the supports 20A, 20B is L10, the expandable sound-absorbing panel 60 is preferable because it can provide the best sound-absorbing effect since a stable air layer 15 is formed at an appropriate size (the distance between the sound-absorbing sheet 1 and the sound-proof sheet 10). The expandable sound-absorbing panel 60 can also be used at an appropriate distance between L10 and L20, and in this case too, the air layer 15 is always formed, providing the best sound-absorbing effect.

6. Other embodiments

(1) In the above embodiment, the telescopic mechanism 50 is composed of a main telescopic mechanism 30 and a guide telescopic mechanism 40, but the guide contraction mechanism 40 can be omitted (not shown).

(2) In the above embodiment, the telescopic mechanism 50 (main telescopic mechanism 30 and guide telescopic mechanism 40) can be configured to expand and contract the distance between the pillars 20A and 20B. This can be achieved by using a structure other than a pantograph-like structure in which the connecting rods 31, 31 (connecting rods 41, 41) are joined by an inner pin 33 and an outer pin 35 (inner pin 43, outer pin 45). For example, the telescopic mechanism 50 can be configured from a telescopic rod (hollow pipe) to configure the pillars 20A and 20B (see FIG. 6).

(3) In the above embodiment, the expansion mechanism 50 is disposed in the air layer 15 between the sound absorbing sheet 1 and the sound insulating sheet 10 arranged side by side, but it can also be structured so that it is disposed on the outer surface 2a side of the sound absorbing sheet 1 and on the outer surface 11a side of the sound insulating sheet 10 (see expansion mechanism 50A in FIG. 6).

(4) In addition, in the above embodiment, it is preferable that the sound absorbing sheet 1 and the sound insulating sheet 10 have the same width and height, but the width and height can be slightly different (not shown).

(5) In the above embodiment, the sound absorbing sheet 1 is configured by attaching a soft sound absorbing material 6 to one surface (inner surface) 4 of the flexible surface member 3. However, it is also possible to attach slightly harder, narrow sound absorbing materials 6, 6 to the inner surface of the flexible surface member 3 in a state where they are divided by folding creases (not shown).

(6) In the above embodiment, the sheet storage tube 62 storing the sound absorbing sheet 1 may be the support 20B, the sheet storage tube 62 storing the sound insulating sheet 10 may be the support 20A, and the support 20A and 20B may be connected by the expansion mechanism 50 to form an expandable sound absorbing panel 60, as in a so-called roll screen (FIG. 6). In this case, the sound absorbing sheet 1 pulled out from the sheet storage tube 62 (support 20B) is locked to the other sheet storage tube 62 (support 20A), and similarly, the sound insulating sheet 10 pulled out from the sheet storage tube 62 (support 20A) is locked to the other sheet storage tube 62 (support 20B). In addition, a telescopic rod type expansion mechanism 50 is disposed between the inner surface 2 of the sound absorbing sheet 1 and the inner surface 11 of the sound insulating sheet 10, and both axial ends of the expansion mechanism 50 are fixed to the supports 20A and 20B. In this expandable sound absorbing panel 60, the sound absorbing sheet 1 and the sound insulating sheet 10 are not folded and always remain flat, ensuring an air layer 15 between the sound absorbing sheet 1 and the sound insulating sheet 10.
In this embodiment, the sheet storage tube 62 also serves as the support 20A (20B), but the support 20A (20B) made of a different material can also be connected to the sheet storage tube 60 (not shown). Also, the telescopic mechanism 50 is configured from a telescopic rod, but it can also be a pantograph or other structure (not shown).
Furthermore, although the expansion mechanism 50 is disposed between the inner surface 2 of the sound absorbing sheet 1 and the inner surface 11 of the sound insulation sheet 10, the expansion mechanism 50A can also be disposed on the outer surface 2a of the sound absorbing sheet 1 and the outer surface 11a of the sound insulation sheet 10 (FIG. 6). Even when the expansion mechanism 50A is used, the sound absorbing sheet 1 and the sound insulation sheet 10 always maintain a flat surface, and the sheets 1, 10 do not come into contact with each other, and a constant thickness of the sound absorbing layer 15 can always be maintained between the inner surface 2 of the sound absorbing sheet 1 and the inner surface 11 of the sound insulation sheet 10.

1. Sound-absorbing sheet (first sheet)
2. Inner surface of sound-absorbing sheet (one side)
2a Outer surface (other surface) of sound absorbing sheet
3 Surface member 4 Inner surface (one side) of the surface member
6 Sound absorbing member 10 Sound insulation sheet 11 Inner surface (one side) of sound insulation sheet
11 Outer surface (other surface) of sound insulation sheet
15 Air layer 18 Mounting tape 20, 20A, 20B Pillar 21 Pillar body 22 Recess of pillar body 23 Magnet 25 Leg 26 Roller 30 Main telescopic mechanism 31 Connecting rod 32 Main telescopic part 33 Inner pin 33a End inner pin 34 Outer pin 37 Half connecting rod 40 Guide telescopic mechanism 41 Connecting rod 42 Guide telescopic part 43 Inner pin 45 Outer pin 45a End outer pin 50, 50A Telescopic mechanism 51 Vertical rod material 53 Insertion square material 55 Receiving bracket (with vertical long hole)
60: Stretchable sound absorbing panel 62: Sheet storage tube

Claims (2)

This stretchable sound-absorbing panel is characterized in that both end edges of a flexible first sheet and both end edges of a flexible second sheet are attached between a first support and a second support arranged in parallel with each other at a distance L10, with their inner surfaces facing each other in the direction of distance L10, to form the following structure.
(1) The first and second supports are connected by an extension mechanism that maintains them parallel to each other and enables them to move to a maximum distance L10 and a maximum distance L20.
(2) The first sheet is made of a material having sound-absorbing properties, the second sheet is made of a material having sound-proofing properties, and an air layer is always formed between the inner surface of the first sheet and the inner surface of the second sheet.
(3) The first sheet and the second sheet are attached to the supports so as to maintain the air layer without sagging in response to the change in the distance between the supports due to the contraction of the telescopic mechanism.
(4) An extension mechanism is disposed between the inner surface of the first seat and the inner surface of the second seat, and the extension mechanism is configured by connecting a main extension mechanism that opens and closes horizontally in a pantograph-like manner and a guide extension mechanism that opens and closes vertically in a pantograph-like manner.
(5) The main telescopic mechanism is configured by arranging rotatable connecting rods in an X-shape around an inner pin so that the main telescopic parts are aligned in a straight line, and each connecting rod is rotatably connected to both ends of adjacent main telescopic parts by an outer pin.
(6) The guide telescopic mechanism is configured by arranging rotatable connecting rods in an X-shape around an inner pin and arranging the guide telescopic parts in a straight line, and by rotatably connecting each connecting rod at both ends of adjacent guide telescopic parts with an outer pin.
(7) Each inner pin of the main telescopic mechanism is connected to one outer pin of the guide telescopic part. 2. The expandable sound absorbing panel according to claim 1, which is formed as follows.
(1) The first sheet and the second sheet are formed with numerous folds parallel to the axial direction of the support pillars, and are structured so that when the distance between the support pillars is at its shortest, L20, the two sheets are folded individually and do not come into contact with each other.
(2) The first sheet is constructed by laminating a flexible sound absorbing material on the inner surface of a flexible surface member having a large number of minute gaps that allow air to pass through.

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