Abstract: A housing includes side walls having a plurality of offset sections with air exit gaps defined between adjacent sections and a roof with an air exit gap defined therein. The housing also includes an air intake section and a door section. The air flow is balanced so sufficient air flows through the structure to maintain proper environmental conditions inside the structure while noise is contained within the structure. Acoustic panels are mounted on the structure to further absorb noise. The structure can be designed to be aesthetically pleasing as well. Lifting eyes as well as anchors can also be included and the structure can be either fabricated on site or elsewhere and shipped as needed.

Abstract: A plate-shaped constructional element comprises a perforated plate made of a solid material such as metal, wood, wood chip board, pressboard, synthetic material or gypsum, and is characterized by the provision that a micro-perforated sheet or thin plate is disposed on one of the plate surfaces of the plate. One variant provides that the holes in the plate are formed in such a manner that they open each into a micro hole on one side of the plate.

Abstract: An acoustic building structure configured to be fixed to a framework of a building and including at least one first acoustic assembly that includes a panel of mineral wool and a bearer of the panel of mineral wool. The bearer includes a pair of one lower and one upper section pieces spaced apart by a spacing p and each of which includes a respective web each facing the other, and a respective flange bent at right angles to the associated web. The flanges are in one and the same plane and face towards each other. The panel of mineral wool is housed between the webs of the section pieces, and the acoustic assembly includes a rigid panel fixed against the outer faces of the flanges of the section pieces.

Abstract: Because the present invention is the floor of the room which is made by laminating a porous expanded resin plastic sheet (2), a bulgy-and-hollow or undulating plate (3), and a porous expanded resin plastic sheet (2′) on a concrete slab (1), and then by plastering the surface of the expanded resin plastic sheet (2′) with mortar (4), it has the effect to improve the efficiency of sound insulation.

Abstract: Aerogel particles, in particular in the form of composite materials, are used to deaden structure-borne and/or impact sounds.

Abstract: A foam-type acoustic panel is designed to be mountable on a stand having a shaft. The acoustic panel includes a main body portion. The main body portion has a first end, a second end, a front surface, a rear surface, a top surface, a bottom surface, and first and second interlocking members. The first and second interlocking members define a multi-segment cut that extends between the top and bottom surface. The multi-segment cut includes a first end disposed at one of the front and rear surfaces, and a second end disposed interiorly of the other of the front and rear surfaces. The second end of the multi-segment cut defines an elongated aperture extending between the top and bottom surface for receiving a shaft of a stand.

Abstract: A sound absorbing structure including a sound absorbing member, an air layer, and a resonant sound absorbing structure. The air layer is formed in the rear of the sound absorbing member. The resonant sound absorbing structure includes a slit and is formed in the rear of the sound absorbing member. The sound absorbing member is a surface plate covering the rear air layer and the resonant sound absorbing structure, and the sound absorbing member is shaped in one of a plate and plane.

Abstract: An acoustical panel assembly for a suspended ceiling comprising a rigid frame, sound absorbing material, sound transmission attenuation material and a face fabric. The frame is an assembly of extruded members secured together in a polygonal pattern such as a square or a rectangle. The fabric is secured to the frame by gripping elements integral with the frame. Marginal portions of the fabric are captured and hidden in receiving chambers formed by the frame members.

Abstract: A invention relates to a ceiling element (1) for a ceiling (D) consisting of several ceiling elements, comprising a lower metal support (4) which is divided up by links (7) and has holes; and an active sound layer (5) which is arranged in the metal support. The layer is a sound insulation layer or a sound absorption layer for example, especially in the form of an open-pore foam such as a melamine-resin foam. The active sound layer (5) is bonded to the metal support (4). According to the invention, the adhesive (6) is only applied to the link areas (11) and only the inner surfaces of the link areas (11) are bonded. This guarantees a simple, economical construction.

Abstract: The invention is directed to a hinged ceiling panel, which is pivotally attached to a suspended ceiling grid structure to provide for a hinged ceiling panel that pivots to allow access to the area above the grid. The hinged ceiling panel includes a hinge located on a first edge and grid-releasable flanges located on the remaining edges of the panel. The hinged ceiling panel is designed so that a single person can easily release the panel from the grid system and pivot it downwards whereby the hinge supports it. The hinged ceiling panel is also designed so that an individual can also reposition the panel within the grid structure without the aid of others.

Abstract: A foam-type acoustic panel is designed to be mountable on a stand having a shaft. The acoustic panel includes a main body portion. The main body portion has a first end, a second end, a front surface, a rear surface, a top surface, a bottom surface, and first and second interlocking members. The first and second interlocking members define a multi-segment cut that extends between the top and bottom surface. The multi-segment cut includes a first end disposed at one of the front and rear surfaces, and a second end disposed interiorly of the other of the front and rear surfaces. The second end of the multi-segment cut defines an elongated aperture extending between the top and bottom surface for receiving a shaft of a stand.

Abstract: The invention relates to a finishing mortar for sound-absorbing coating of inner walls, ceilings and the like in buildings. It may be applied directly on concrete or some other carrying material or on underlying insulation material, such as mineral wool. The finishing mortar according to the invention is characterized in that it comprises cotton fibres and expanded mineral, such as perlite.

Abstract: A noise attenuation panel for an aircraft engine nacelle structure comprises a cellular core having a multiplicity of cells and a facing sheet having a multiplicity of holes which provide for gaseous fluid communication between the cellular core and the front face of the facing sheet. Each hole in the facing sheet has a bore diameter which increases along the bore in the direction of the rear face of the facing sheet throughout the bore or a part of the bore and which does not at any point of the bore decrease along the bore in the direction of the rear face of the facing sheet. Prior to assembly of the facing sheet and the core the holes are formed by electron beam drilling from an entrance face of the facing sheet through to an exit face and the facing sheet and the cellular core are assembled to form the panel in such disposition that the exit face forms the front face of the facing sheet and the entrance face forms the rear face of the facing sheet.

Abstract: A light-transmitting building component, as wall roof or ceiling component etc. is formed with a technical membrane, in the form of a textile tissue on the outward-facing side and, furthermore, by a sound-insulation layer arranged at a distance to the outer layer of the technical membrane, and by and infrared-impeding, light-transmitting layer on the inward-facing side. In this manner, a building component is created which features low surface weight and still meets stringent requirements not only in terms of resistance to climatic influences but also with regard to heat and sound insulation.

Abstract: The invention provides sound insulating panels for use in noise screens, the panels being formed from mineral wool of substantially uniform density and average density from about 100 to about 2000 kg/m3 and thickness not more than about 200 mm. These panels may advantageously be used in noise screens comprising one or two upright support members having I-profile cross-section of width greater than the panel thickness.

Abstract: A wall panel including a rectangular frame, a pair of wall members and a thin decorative sheet covering the wall members. The frame includes two spaced apart, generally parallel vertical frame members and spaced apart, generally parallel horizontal lower and upper frame members. The horizontal frame members are connected to the vertical frame members at opposite ends thereof to form the rectangular frame. Each of the frame members includes a core member and a pair of sidewall members attached to opposite sides of the core member. The wall members are attached to the sidewalls on opposing sides of the frame members. A decorative sheet covers the outer surface of each wall member. A method for manufacturing the frame members includes providing a fixture with spaced apart first, second and third surfaces. A hanger bracket is mounted to the vertical frame core member and is positioned in the fixture such that the hanger bracket engages the first surface.

Abstract: A sound insulating structure (12) comprises first layer plates (30) arranged in coplanar and contiguous relationship in order to form a first structural layer, second layer plates (13) arranged in coplanar relationship in order to form a second structural layer in spaced parallel relation with the first structural layer, and a core (6), which core effectively bridges the space between and adheres together plates of the respective layers, and which core comprises an elastic, vibration deadening mass. At least one through opening is provided in each of the second layer plates with the purposes of permitting escape of any trapped air and of permitting inspection of the space between the structural layers while the mass in the core sets to an elastic state. The invention also provides a panel and a method of manufacturing a sandwich board.

Abstract: Disclosed is a device which drastically reduces transmission of low frequency vibrations from one region to another. The device is particularly useful in the building industry and in use, is placed in a network between wall structures of adjacent rooms. The device is easy to install and can be modified to suit particular applications.

Abstract: A building panel includes a first skin which is bonded to a first face of a first foam sheet. A second face of the first foam sheet is fixed to a cellular network. The cellular network includes a first face, a second face, and a plurality of cells defined by a plurality of cell walls. The second face of the cellular network is fixed to a first face of a second foam sheet. A second skin is bonded to a second face of second foam sheet. In one embodiment, the first skin may include a first portion, a second portion, and a third portion. The first portion of first skin is bonded to the first face of the first foam sheet. The second portion of the first skin extends beyond the first foam sheet and forms a first interlocking member. The third portion of first skin extends beyond the first foam sheet and forms a first complementary interlocking member. The second skin of the building panel may also includes a first portion, a second portion, and a third portion.

Abstract: A cladding system for walls or ceilings of a building structure consisting of a panel or panels that are sectioned so as to provide a variety of aesthetics. The sections in the panel may be joined along articulated lines of joinder so that an entire panel comprised of a plurality of sections can be expanded or retracted to either cover or selectively expose the wall or ceiling across which the system is mounted. The sections in a panel may be cellular and may thereby form a honeycomb-type panel, and the materials from which the panels are made may vary between being rigid, flexible, hard, soft, flat, reflective, and the like.

Abstract: An acoustically significant composite panel having a general sound-absorbing face (or a general sound-diffusing face) and a tuned sound-absorbing face. Such a panel includes a sandwich or composite of a first layer of molding media, a honeycomb of cells and a second layer of molding media. The first layer has at least one or more apertures in it that convert the corresponding cells into Helmholtz resonators. These Helmholtz resonators can be tuned to the same or different frequencies. The second layer is generally sound-absorbing. A general diffuser structure can be attached to the second layer. These panels can be attached to the walls and/or ceilings of a room to control its sonic quality. Also, these panels can be suspended vertically below a ceiling to control noise.

Abstract: A novel insulated wall structure is formed with upright hollow thermoplastic extrusions connected together in a row, with the extrusions presenting a row of compartments (15,22,30) adapted to receive concrete (39) extending along the length of the wall structure and a row of compartments (16,23,33) containing or adapted to receive insulation (38) material also extending along the length of the wall along side or in parallel with the row of concrete receiving compartments (15,22,30) whereby when the compartments (15,22,30) adapted to receive concrete (39) are filled with concrete (39) and the insulation (38) receiving compartments (16,23,33) are filled with insulation (38) the insulation (38) in said insulation (38) receiving compartments (16,23,33) is positioned to block heat transfer through the wall.

Abstract: A cladding system for walls or ceilings of a building structure consisting of a panel or panels that are sectioned so as to provide a variety of aesthetics. The sections in the panel may be joined along articulated lines of joinder so that an entire panel comprised of a plurality of sections can be expanded or retracted to either cover or selectively expose the wall or ceiling across which the system is mounted. The sections in a panel may be cellular and may thereby form a honeycomb-type panel, and the materials from which the panels are made may vary between being rigid, flexible, hard, soft, flat, reflective, and the like.

Abstract: A molded fabric treatment includes an integral undercut or inturned peripheral flange for affixing the treatment to the structure to be treated. The treatments have a conventional, decorative, woven polyester fabric (of the type currently used in conventional office divider screen systems), or fabrics comprising other synthetic or natural fibers, bonded with adhesive to a relatively stiff moldable non-woven polyester fiber backing. The treatments are formed in a membrane or bladder press in which a flexible membrane presses the fabric and fiber composite against a form or mold that includes an undercut edge which, in cooperation with the press membrane, forms undercut flanges about the periphery of the treatment. The undercut or inturned flange may then be "snapped" over a corresponding mounting lip on the structure to be treated.

Abstract: A sound insulating membrane and processes for forming, particularly well suited for use in floor, ceiling and wall constructions. The membrane comprises at least one backing layer in contact with a layer of nonfoam polymeric material. The polymeric material has an elongation factor of about 500% to about 900% and a Shore A hardness of from about 65 to about 80 points, 5 seconds. In a preferred embodiment, the polymeric material comprises 40-70% chlorinated polyethylene, 20-30% ethylene vinyl acetate, and up to 10% polyvinyl chloride. Floor, ceiling and wall constructions and related methods utilizing the sound insulating membranes are also disclosed.

Abstract: The collapsible shelter includes a truss and canopy framework that permits a flexible, collapsible canopy to be moved between a raised position and a lowered position. The collapsible shelter includes at least three legs supporting flexible poles removably mounted to the tops of the legs and forming the framework of the canopy. X-shaped truss pairs of link members are connected to each of the legs on each side of the shelter between adjacent legs.

Abstract: A sound absorbing hollow core panel of structural material based on Helmholtz resonator properties consisting of two exterior skins connected by spacers or structural connections and bounded by perimeter skins or structural connections with internal cavity or cavities that communicate with the exterior sound field through a plurality of orifices in one or both exterior skins as well as the perimeter of the panel and that have a plurality of Helmoltz resonators of different shapes and sizes tuned to specific frequencies that control the sound absorption characteristics of the hollow core panel. The internal cavity or cavities are defined by external skins and perimeters as well as internal structural elements acting as interior dividers, interior sub-volumes and perimeter structures, each of which may contain a plurality of orifices for sound communication forming a sequence of first order Helmholtz acoustical resonators with respective natural frequencies for sound absorption.

Abstract: An acoustic panel system is provided for partially acoustically isolating a portion of a space in, for example, a recording studio. The acoustic panel system is modular in design and includes a plurality of different sized acoustic panels which can be assembled together in various configurations to form complete or partial acoustically isolated areas within a space. The acoustic panel system includes wall mount members, wall panels, floor panels, ceiling panels, transparent viewing panels and door panels. The wall mount members are basically partial members either permanently or removably interconnected with the walls of a space. The wall panels can be interconnected with the wall mount members. The wall panels may include casters for facilitating the movement thereof, and may also include feet for supporting the panels on uneven flooring.

Abstract: This invention provides a thin metallic sheet structure having excellent sound damping characteristics which can lower the sound pressure level of a sound inherent to a thin metallic sheet structure when this structure is patted, and can quickly damp the sound by a simple structure. In a flat sheet-like or box-like structure comprising a thin metallic external sheet and beams for reinforcing the external sheet, a thin metallic sheet structure having excellent sound damping characteristics according to the present invention employs the construction wherein the reinforcing beams 2 are brought into contact with one of the surfaces of the thin metallic external sheet 1 through a sound damping sheet 3, and the coupling state between the sound damping sheet 3 and the thin metallic external plate 1 or the reinforcing beams 2 is a non-coupling state or a discrete coupling state on at least one of the surfaces of the sound damping sheet 3.

Abstract: An electromagnetic wave absorption panel for use in building construction includes a protective tile layer, an absorber layer, a metal reflective layer, and a building support layer, such as concrete. The absorber layer utilizes novel materials including high dielectric constant materials, such as ABO.sub.3 type perovskites, layered superlattice materials, conducting oxides, and signet magnetics, ferroelectrics, such as ABO.sub.3 type perovskites and layered superlattice materials, garnets, a nickel-zinc ferrite, Ni.sub.0.4 Zn.sub.0.6 Fe.sub.2 O.sub.4, and polymer-ceramic composites of the above materials.

Abstract: A sound attenuating apparatus for noise bearing fluid streams wherein elongated perforated wall forming panel sheets include integrally formed indentations extending along a direction transverse the direction of the fluid stream to provide strength and stiffeners for the perforated panel sheets.

Abstract: The invention is directed to a tackable/acoustical wall panel having a peripheral frame including a top rail, a bottom rail, opposed side rails and a dividing rail bisecting the panel into a first cavity and a second cavity. The dividing rail extends at a height where a work surface would be attached to the panel. The first cavity has a substantially rigid first septum mounted therein in order to restrict sound transmission through the panel. The first septum has opposing rigid front and back surfaces. A tackable inner layer is secured to the first septum. The second cavity has a substantially rigid second septum mounted therein in order to restrict sound transmission through the panel. The second septum has opposing rigid front and back surfaces. A decorative cover is secured to the frame and extends over the first cavity and the second cavity.

Abstract: A fabric wall panel system which mounts wall panels by means of releasable hanger. The fabric wall panel system includes a wall panel and a hanger. The fabric wall panel comprises a frame and a flat filler insert. The frame comprises a plurality of linear frame members. Each frame member has a spine with an elongated opening, a side edge, and a front edge which together define a groove. The flat filler insert is fitted within the groove of each frame member. Fabric is stretched over the frame and insert and is bonded to the back of each frame member to complete the finished fabric wall panel. The hanger has a flat base and a perpendicularly extending tongue with an enlarged head. A number of hangers are affixed on the wall using an adhesive. The slit on the fabric wall panel is aligned with the tongue of hanger on the wall, and the fabric wall panel is affixed to the wall by pressing the slit over the tongue on the hanger. The fabric wall panels can be prefabricated or installed in situ.

Abstract: A panel for constituting sound insulating wall is provided with a front plate, a rear plate, and a sound absorbing member put between the plates. The sound absorbing member contains reduced plastic products coated with magnetic material such as magnetic tape and magnetic sheet. The front plate is provided on the sound source side and constituted of a plate having numerous holes. The sound absorbing member is composed of a permeable bag and the reduced plastic products in the bag so that the bulk specific gravity and permeation resistance can be 0.05-0.4 and 3-90 dyn.S/cm.sup.4, respectively. The reduced plastic products may be reduced plastic products alone not subjected to other processings, or may be a mixture of reduced plastic products and molded bodies of reduced plastic products. Alternatively, only molded bodies of reduced plastic products can be put in the permeable bag.

Abstract: In wall, ceiling or roof elements, whose basic structure consists mainly of wood or wood materials, and which are provided for buildings that are constructed entirely or partly of panel construction, it is proposed in order to achieve good physical building properties and high load-carrying capacities, to fasten a veneer (4, 5) on one or on both sides to the planar ridge surfaces of a folded plate construction (1) made of boards connected in a shear-resistant manner or a folded plate structure made of molded wood materials and to fill the formed empty or hollow spaces with heat-insulating materials (6), covering materials or light concretes with roughened texture, foamed concretes or the like (7), in which the fillings can be provided made of the same or optionally of combinations of different materials and the components thus made available can be provided with corresponding additional inside shells (10, 11) as well as outside shells (12) or floor structures.

Abstract: A sandwich plate has a pair of relatively dense, stiff, thin, and generally parallel longitudinally extending skins, and a less dense core body having a pair of generally parallel faces bonded to the skins and formed with longitudinal and transverse cavities connected together in a Z-shape and forming central longitudinally extending tongues.

Abstract: A sound insulating barrier for improving acoustics in buildings, theaters, and around freeways, is disclosed. The sound insulating barrier has a multi-layer construction made of a layer of wood wool, a layer of basalt insulation material, a layer of sheet rock and a central core of basalt insulation material. These layers are repeated on the opposite side of the central core of basalt insulation to obtain a stand-alone wall. Alternatively, the layers up to the central basalt insulation layer can be attached to any pre-existing flat surface. The basalt insulation material is made of mineral wool. Conventional spacers can be used to separate layers or to improve the integrity of the wall. Furthermore, the sound insulating barrier can be built around conventional construction studs.

Abstract: An acoustical surface is formed by securing a series of half cones, preferably truncated, to a wall.

Abstract: A sound absorber arrangement includes a plurality of sound absorbing layers of porous materials such as glass wool, rock fiber or cellular plastic, and high-polymer films, are alternately laminated in a direction perpendicular to a sound incidence plane. The layer thicknesses are increased in order in a direction away from the sound incidence plane. The sound absorber arrangement makes it possible to make a sound absorbing coefficient constant over the low to high frequency sound range.

Abstract: A sound absorbing device for use as a sound barrier. The device includes at least one elongated tubular member of fiber reinforced, thermosetting resin formed by pultrusion and having a hollow interior able to receive sound absorbing material. The hollow interior is filled with sound absorbing material including particulate, recycled polymer firmly compacted within and substantially filling the hollow interior of the tubular member.

Abstract: A tackable tile for mounting to a frame to provide a tackable surface to a wall having one or more of such tiles is disclosed. The tile includes a frame defining an open central portion, and a composite tackable member conforming to the perimetric shape of the frame and mounted in the open central portion thereof. The composite tackable memeber includes a resilient pierceable layer of material, and a layer of noise reducing acoustic material. The layer of pierceable material has a front and a rear side, and the acoustic material is adhered to the rear side of said resilient pierceable layer.

Abstract: A movable, prefabricated wall panel having a rigid rectangular frame, a septum core disposed within the region bounded and confined by the frame, and adjacent layers of fibrous sound absorbing material is disclosed herein. The septum core is formed from a central layer of honeycombed-shaped paper sandwiched between two steel skins, and is fixedly confined to the center of the interior frame perimeter by elongated channels of the perimeter frame. The combined shape forms a central cavity on opposing sides of the septum core allowing relatively thick inner layers of sound absorbing fibrous material, preferably fiberglass, to be placed within the panel adjacent to each steel skin. Outer layers of sound absorbing fibrous material are placed adjacent to the inner layers, and the outer layers are covered with fabric or similar material.

Abstract: A correctional facility cell pair includes a cell from attached to a cell wall. The cell front has a frame, a pair of doors, and a pipe chase. The pipe chase has both a removable panel and a hinged hatch. The hatch is used for routine access to the interior of the chase; the panel can be removed by unbolting from inside the chase for easier access to the chase interior when more extensive work in the chase is required. Manufacture of the cell front as a unit simplifies the construction of the cell pair because the order of installation of cell walls and cell front is no longer critical as it is in current design; the present invention allows either to be installed first. The, cell front is preferably made of channel steel with sound attenuating material placed inside the channels.

Abstract: A building structure comprising a base and a plurality of spaced support members extending from the base in offset relation. Each support member has an outer edge, side edges and an inner edge and is positioned such that the inner edges of offset support members overlap through a vertical plane in the structure. First and second panels are attached to the outer edges of the support members, the inner edge of each support member being spaced apart from the opposite panel. A plurality of rigid panel members extend between the side edges of any two adjacent support members attached to the same panel and across the inner edge of the intervening offset support member attached to the opposite panel to define a series of three non-communicating chambers between the first and second panels repeated along the length of the structure. The arrangement acts to lessen the transmission of sound through the structure.

Abstract: A lay-in ceiling panel structure, comprising a glass fiber ply, a gypsum board, and a highly perforated vinyl lamina. The ceiling panel structure having noise and sound transmission reduction coefficients in the range of 0.85 to 0.95 sabins and 0.35 to 0.39 dbs respectively. This structure also provides good fire resistance, space efficiency, and a lower surface that is washable and pleasing to the eye. In addition, the glass fiber ply is secured to the gypsum board by droplets of glue which are spaced 1 to 2 inches apart and which are applied 4 to 6 inches away from the outer periphery of the gypsum board. Applying the glue in this way allows the glass fiber ply and vinyl lamina to lay flat even if the board is warped by water leaks, humidity or age.

Abstract: A fabric tile which is formed of a metal pan having tightly stretched thereover a fabric sock. The fabric sock is attached to the metal pan by way of mounting or attachment clips which are sewed and glued to edge portions of the fabric sock and which are engaged over terminal return flanges of the metal pan. Each clip is elongated and extends a major portion of an edged dimension of the metal pan and is of a J-shaped cross section. Each clip includes an elongated stem which terminates in a generally U-shaped hook. The hook includes a first leg which is a continuation of the stem and a second leg disposed in spaced parallel relation to the first leg by way of an integral base. The second leg has a terminal free edge portion which is flared relative to the first leg so as to facilitate engagement of the clip with the metal pan.

Abstract: An acoustical ceiling roof panel assembly including a plurality of roof deck panels assembled in side-by-side relationship and secured to roof supports with each panel including a plurality of parallel and spaced apart perforated flat sections. Each flat section is separated from its adjacent flat section by a rib section, and has a width at least three times and preferably five times greater than the width of the rib section as measured in the plane of the flat section. Lengths of insulation are positioned between adjacent ribs so as to substantially fill the space formed by the adjacent ribs and the flat section. A wire mesh spacer is positioned within the space between each perforated flat section and the insulation to maintain the insulation in spaced relationship to the flat section.

Abstract: The wall covering assembly includes a flexible, resilient, preferably sound-deadening, fire-resistant sheet of wall covering, preferably of plastic and/or cloth. The assembly also includes one or a spaced number of preferably parallel wall covering anchoring strips releasably connected to the rear of the wall covering. The strips can be anchored to the exposed surface of a wall to hold the wall covering over and spaced from the wall. Each strip may be of plastic, wood, metal, ceramic or the like and includes a rear base plate adapted to be connected, as by adhesive, screws, etc. to a wall. It also includes a front plate spaced forward of the base plate by integral struts, preferably parallel therewith and defining therebetween an acoustical space. The front plate bears anchoring hooks attachable to the rear of the wall covering. Preferably, the strips bear breakaway segments on one side thereof, removably blocking access to the space.

Abstract: A fabric tile which is formed of a metal pan having tightly stretched thereover a fabric sock. The fabric sock is attached to the metal pan by way of mounting or attachment clips which are sewed and glued to edge portions of the fabric sock and which are engaged over terminal return flanges of the metal pan. Each clip is elongated and extends a major portion of an edged dimension of the metal pan and is of a J-shaped cross section. Each clip includes an elongated stem which terminates in a generally U-shaped hook. The hook includes a first leg which is a continuation of the stem and a second leg disposed in spaced parallel relation to the first leg by way of an integral base. The second leg has a terminal free edge portion which is flared relative to the first leg so as to facilitate engagement of the clip with the metal pan.

Abstract: In accordance with the invention a wall assembly for displaying visual messages, has a front portion, a display area in the front portion, the display area providing an opening through the wall assembly, a projection screen for covering the opening, and a display panel movable from behind part of the front portion into the display area. The wall assembly can be placed before an audience and used to display visual messages which may be shown for example by projection onto a screen, or by writing on a display panel, with a facility for covering the display area when that area is not in use.