FIELD OF THE INVENTION
The invention is in the technology of audible sound reflecting structures. The structures are portable acoustic panel assemblies used as a band, orchestra, chorus and dramatic background shells in a stage areas.
BACKGROUND OF THE INVENTION
The quality of a musical performance out of doors is diminished if a background sound reflecting structure is not employed to direct the sound toward the listening audience. Portable sound enhancing panel structures are known to amplify and project sound from bands, orchestras or choral performers outwardly toward a listening audience. The panel structure when used for outdoor performances capture and redirect the upwardly directed sound back to the performers and forward to the listening audience. An example of a portable acoustic panel structure, disclosed by J. C. Jaffe in U.S. Pat. No. 3,232,370, has panels hinged together to provide an upright shell. Upright legs connected to wheels support the panels above a floor. The prior art acoustic shells are complex structures which are heavy and awkward to move around once they are assembled. Casters and wheels used to roll the shells to selected locations on hard surfaces are unsuitable for outdoor use on soft ground and grass lawns. There is a need for a portable, low cost and lightweight acoustic panel assembly that is adapted for use in outdoor locations.
SUMMARY OF THE INVENTION
The acoustic reflective panel structure of the invention is a panel assembly that is portable, lightweight, low cost and readily assembled and disassembled. The disassembled panel assembly is movable and storable in a compact location. The panel assembly is suitable for outdoor performance use on locations including lawns, soft earth, concrete floors and stage platforms. The panel assembly has an upright frame surrounding a flexible sheet member that functions as an audible sound reflecting shell. The panel assembly also is a visual shield masting background environments thereby enhancing visual and sound created by music, actors and dance performers. Flexible elastic cords connects the sheet member to the frame. The cords are under tension to bias the sheet member laterally and vertically to maintain the sheet member taut in a flat condition surrounded by the frame. The taut sheet member does not generate noise as it does not flap in wind. Braces connected to the frame and a support surface maintain the panel assembly in its upright position. The panel assembly is used with a group of side-by-side identical panel assemblies to provide an acoustic reflective background shell for performing arts performances.
DESCRIPTION OF THE DRAWING
FIG. 1 is a front elevational view of the acoustic reflective panel assembly of the invention;
FIG. 2 is a rear elevational view thereof;
FIG. 3 is a side elevational view thereof;
FIG. 4 is an enlarged sectional view taken along the line 4-4 of FIG. 1;
FIG. 5 is an enlarged sectional view taken along the line 5-5 of FIG. 1;
FIG. 6 is an enlarged sectional view taken along the line 6-6 of FIG. 1;
FIG. 7 is an enlarged sectional view taken along line 7-7 of FIG. 1;
FIG. 8 is an enlarged sectional view taken along the line 8-8 of FIG. 3;
FIG. 9 is a plan diagrammatic view of a small group arrangement of acoustic reflective panel assemblies of the invention; and
FIG. 10 is a plan diagrammatic view of a large band or orchestra arrangement of acoustic reflective panel assemblies of the invention.
DETAILED DESCRIPTION OF THE INVENTION
In the following detailed description of the acoustic reflective panel assembly, reference is made to the accompanying drawing that form a part hereof. It is to be understood that other embodiments of the acoustic reflective panel assembly may be utilized and structural changes may be made without departing from the scope of the invention.
The acoustic reflective panel structure of the invention, shown in FIGS. 1 to 3, has a panel assembly 10 supported in an upright position on ground 11, such as a lawn. Other supports, including but not limited to floors, decks, stages and platforms, can be used to hold the panel assembly. Panel assembly 10 includes an upright frame 12 surrounding an audible sound reflecting member 13. A plurality of elastic members 14 secure member 13 to frame 12 and hold member under tension on frame 12. A plurality of panel assemblies are used to provide an audible sound shell that directs the sound from a stage area toward an audience environment. Examples of panel assembly arrangements are diagrammatically shown in FIGS. 9 and 10.
Frame 12, shown in FIGS. 1 to 3, has a horizontal base member 16, shown as a right angle linear metal bar, resting on the surface of ground 11. Upright side members 17 and 18 are connected to opposite ends of base member 16 with curved elbows 19 and 21. The upper ends of side members 17 and 18 are connected to couplings 22 and 23. A horizontal member 24 extended across the upper portion of audible sound reflecting member 13 has opposite ends joined to couplings 22 and 23. A horizontal top member 26 is connected to couplings 22 and 23 with curved elbows 27 and 28. Members 24 and 26 are substantially parallel to base member 16. Side members 17 and 18, horizontal members 24 and 26 and elbows 19, 21, 27 and 28 are metal tubes telescopically connected together. Other materials, such as plastic tubes or rods, can be used for frame 12. Releasable fasteners, U-bolts and clamps can be used to connected elbows 19, 21, 27 and 28 to side members 17 and 18 and horizontal members 24 and 26.
As shown in FIG. 7, elbow 23 has a downwardly extended section 29 with a cylindrical pocket 31. The upper end of side member 18 telescoped into pocket 31 connects side member 18 to coupling 23. Section 29 is joined to upwardly and forwardly extended section 32 having a cylindrical pocket 33. The lower end or elbow 28 is telescoped into pocket 33 to join elbow 28 to connect elbow 28 to coupling 23. Coupling 22 has the same structure as coupling 23. Couplings 22 and 23 each have horizontal blind holes accommodating opposite ends of horizontal member 24. Couplings 22 and 23 and elbows 19, 21, 27 and 28 allow frame 23 to be knocked down into generally linear members to facilitate transport and storage of panel assembly 10. As shown in FIG. 3, coupling 23 positions elbow 28 and upper section 34 of member 13 at an upward and forward projected angle 36 relative to the vertical plane of member 13 surrounded by frame 12. A 45-degree angle is an example of angle 36. Other angles can be used for upper section 34 of sound reflecting member 13.
Sound reflecting member 13 comprises a flat generally rectangular air impervious sheet material. The sheet material is flexible plastic sheet member with ultraviolet resistant properties. An example of the sheet material is a fiber reinforced polypropylene plastic. Other types of plastic and fiber materials can be used for sound reflecting member 13. Member 13 has a border 37 with eyelets 38 to 48 spaced along the sides and bottom of border 37. Elastic members indicated generally at 14, comprise a plurality of elastic rubber or plastic cords 49 to 60. Cords 49 to 60 have first ends extended through eyelets 38 to 48 and fastened to border 37 with knots. Hooks connected to the first ends of cords 49 to 60 can be attached to eyelets 38 to 48. The second ends of cords 49 to 52 and 57 to 60 extended around side members 17 and 18 and elbows 27 and 28. A hook 61 on the second ends of each cord 49 to 60 retains cords 49 to 60 attached to side member 17 and 18 and base member 16. Hook 61, as shown in FIG. 4, extends over cord 58 to hold the second end of cord 58 about side member 18. As shown in FIG. 5, cord 54 has a second end extended around base member 16. Cords 49 to 60 space sound reflecting member 13 inwardly from base member 16 and side members 17 and 18 to allow air to flow around member 13. Cords 49 to 60 are stretched to place them in tension. This places an opposite outward and downward biasing force on member 13 and maintains member 13 within the upright plane of frame 12. The biasing cords 49 to 60 absorbs wind pressure and reduces flap of member 13 in a wind. The taut sound reflecting member 13 has minimal movements when subjected to flowing air whereby member 13 produces no undesirable noise.
As shown in FIGS. 1, 2 and 6, a plurality of spikes 62, 63, 64 and 65 anchor base member 16 to ground 11. Spikes 62 to 65 extend through holes in base member 16 and project downwardly into ground 11. Spikes 62 to 65 can be extracted upwardly out of ground 11 to allow base member 16 and panel assembly 10 to be transported, stored or moved to a new location.
Frame 12 and member 13 are maintained in upright positions by a pair of braces 66 and 67 connected to side members 17 and 18 are anchored to ground 11 rearward of base member 16. A bolt 68 pivotally connects the upper end of brace 66 to side member 17. Brace 66 extends downwardly and rearwardly to an anchor 69 attached to ground 11. The upper end of brace 67, shown in FIG. 3, is connected with bolt 71 to side member 18 and secured to ground 11 with an anchor 72. As shown in FIG. 8, anchor 72 is an inverted U-shaped member attached to ground 11 with spikes 73 and 74. The lower ends 70 of braces 66 and 67 are curved upwardly to prevent forward and rearward movements of braces 66 and 67. Anchors 69 and 72 extended over the middle of the curved lower ends 70 of braces 66 and 67 retain ends 70 in engagement with ground 11 and inhibit movement of ends 70 relative to ground 11.
As shown in FIGS. 2 and 3, the upper section 34 of audible sound reflecting member 13 extends over top frame member 26 and downwardly adjacent the back of member 13. A pair of guy ropes 76 and 77 connected to couplings 22 and 23 and anchored to ground 11 with spikes 81 and 82 maintain frame 12 and member 13 in vertical alignment and retain end 34 of frame member 26. Guy ropes 76 and 77 limit lateral and forward movements of frame 12 and member 13.
Panel assembly 10 can be used in a number of arrangements behind an individual performer, a politician or a group of performers to direct sound to outdoor audiences. The number and angular orientation of panel assemblies can be selected to enhance the quality of the audio and visual experience of the audiences. A group of three panel assemblies 10A, 10B and 10C, shown in FIG. 9, is used for an individual or small group of performers. A group of eight panel assemblies 10D to 10K, shown in FIG. 10, is used for a large group of performers, such as a band, orchestra or choral arrangements. Adjacent panel assemblies are separated from each other to allow air to flow between the panel assemblies to reduce wind stress on the panel assemblies without reducing the acoustic reflecting characteristics of the panel assemblies.
The panel assembly of the invention has been described with respect to a particular embodiment thereof. It is appreciated and understood that variation and modifications of the size, materials, and parts of the panel assembly can be made by persons skilled in the art without departing from the scope of the invention defined in the appended claims.
Patent Application
20090000219
