Abstract: An improved folded absorbent paper product includes a first, central panel; a second panel, unitary with the first panel and folded over a first side of said first panel; a third panel, unitary with the first panel, and folded over a second side of the first panel; a fourth panel, unitary with the second panel, and folded so as to be positioned between the first and second panels; and a fifth panel that is unitary with the third panel and folded so as to be positioned between said first and third panels. Advantages of the improved product include an optimization of weight to space considerations, the fact that exposed edges are kept out of view, an ability to work in a gravity feed dispenser in any of four possible orientations, and an assurance of double ply strength at intended gripping locations. A method of dispensing and of use is also disclosed.

Abstract: A wet wipe having an improved dispensability and a method of producing the same are described. The wet wipe defines a pair of opposite end edges. At least a portion of one of the end edges is configured in a non-linear pattern which is adapted to facilitate a dispensing of the wet wipe. The end edge of the wet wipe which is configured in the non-linear pattern is further configured to provide a peel force of no more than 50 grams and a peel force ratio of at least 1.1. The wet wipe is also configured to provide an average dispensing force of no more than 10 grams and a dispensing force ratio of at least 1.1.

Abstract: A hygienic sanitary towel of a rectangular planar shape formed of a first outer sheet, a second outer sheet, and a third inner sheet sandwiched between the outer sheets in a stacked registered press-fit relation and with each sheet formed of an absorbent pressed fiber material.

Abstract: The car interior member and its molding method are offered to improve recycling and to reduce the number of parts. The instrument panel 10 as the car interior member is made by molding integrally the core member 11 organizing the main structure of certain area of car interior and the functional member 12, 13, 14 having particular function and attached to the core member 11 by the blow molding. On the occasion of then, the number of parts can be more reduced when the base layer arranging the most inside and the foamed layer and the surface layer arranging outside of the base layer are effected by the multilayer blow molding in case of the instrument panel 10 formed with the multi-layer construction.

Abstract: A hollow profile (1) that can be used as a spacer for insulating glass panes, consists of a metal strip with a U-shaped cross section that forms, with its crosspiece (6), outside wall (2) and, with its side parts (8, 10), folded over inward, side walls (4) of the hollow profile (1). The inside wall (3) of the hollow profile (1) is formed by the crosspiece (15) of a plastic strip with a hat-shaped cross section. The plastic strip has side parts (17) which are secured, with edges (18) folded over outward, on side walls (4) by clamping them in the space between side parts (8) and inward-folded edges (10) of the metal strip. The hollow profile can be produced continuously by a roll shaping process from a metal strip and from a plastic strip.

Abstract: The present invention relates to a canvas reinforcement structure which enables canvas to become strong enough to sustain greater external force (such as wind), and enlarge tension strength to avoid breakage as well as form overall restraint effect for obtaining whole covering performance; it comprises reinforcement corner block mounted on respective corners of canvas, and corner block including upper and lower reinforcement pieces to form contact limited room and outlet hole for retaining canvas and therefore rivetting together with canvas by means of rivet; central position having through hole, collar rope hole for building up each corner of canvas with resistant ability against tearing force without risk of breakage; and restraint portion is folded with appropriate width of canvas for inserting restraint rope and auxiliary rope wrapping body so as to strengthen resistance of canvas periphery against lifting over as well as reinforcing the effect of secure tying.

Abstract: An insulated freight container quilt comprises first and second elongate cover sheets coated on an outer side with polypropylene fiber, the cover sheets being of a material selected from a group of spun bonded polypropylene and spun bonded polyester. A batt of polyester staple fibers mounted together with an acrylic binder is sandwiched between inner sides of the first and second sheets. A seam structure along perimeter edges of the sheets secures the batt between the sheets.

Abstract: A space filling unit for use in a container for cargo shipment to prohibit shifting of the cargo is formed by flat first and second panels, with first and second slots formed in each so that, when assembled, an x-shaped structure is formed. When placed in the container, respective end edges of the panels are supported on the bed of the cargo container while the other of the panel's end edges engage the container's sidewalls. The panel side edges form a pair of x-shaped bases which serve to support the cargo against movement toward the end wall of the container. An anti-slip element may be included on the respective end edges, braces may engage the panels proximate respective end edges, and panel wear on the cargo. An auxiliary bearing penal may also be used adjacent at least one of the x-shaped bases. A plurality of x-shaped structures may be utilized in the present invention, with a corresponding plurality of bearing panels interposed between the x-shaped structures.

Abstract: This invention relates generally to foil laminated tabletops and to methods for their manufacture. Tabletops according to the present invention can be laminated over their entire upper and side surfaces with a continuous sheet of thin foil, the foil typically comprising a plastic material. The foil layer ends at an angular lower edge where the side surface intersects the lower surface of the tabletop. By providing an angle preferably greater than about 120.degree. about the lower edge, the lower edge of the tabletop preferably does not feel sharp and the edge of the foil is at least partially hidden from view. The present invention also provides foil laminated tabletops having an upper surface provided with functional retaining recesses for retaining items on the tabletop.

Abstract: A vinyl shake for being affixed to an exterior wall of a building is disclosed. The shake comprises a textured sheet having an upper flanged portion and a lower flanged portion, the upper flanged portion being bent downwardly on one side of the textured sheet, the lower flanged portion being bent upwardly on the reverse side of the textured sheet, the upper flanged portion including at least one opening formed therein, the textured sheet including at least one opening formed therein and aligned coaxially with the opening formed in the upper flanged portion, the upper flanged portion including a lip laterally coextensive therewith and extending downwardly below and beyond the coaxially aligned openings formed in the upper flanged portion and textured sheet.The forgoing abstract is neither intended to define the invention disclosed, nor is it intended to be limited as to the scope in any way.

Abstract: Decorative pleats have two cuts made in each of two or more pleats and the fold of the pleat is reversed between the cuts. When used as a decorative display for a photograph, picture, merchandise or other item, the cuts may be made angularly to hold the item in place. Cuts may be perpendicular to the fold of the pleat, angular to the fold, zigzag, curvilinear or of other shape. The pleats may be a blind, a lantern or of other shape.

Abstract: Disclosed is a protective patch for smoothly covering labels in existing garments. The patch includes a flexible member formed of cotton flannel, and an adhesive material on the flexible member. The adhesive material forms a first adhesive that extends within a ring-shaped region proximate an edge margin of the flexible member, the first adhesive being releasable from the garment for exposing the label. A marginal portion of the flexible member is folded against a facing portion of the flexible member for forming a double thickness of the flexible member with the edge margin being spaced inwardly from an outer perimeter of the patch. A second adhesive secures the marginal portion to the facing portion, the marginal portion having a corner width at locations of minimum radius of the outer perimeter, the corner width being less than half of the minimum radius for limiting projections of the perimeter margin away from the facing flexible material.

Abstract: A puzzle paper-block structure, which is made of a piece of paper having a given folding strength; the paper is folded symmetrically along a horizontal folding line, and then is folded further along a vertical folding line to form two sides (left and right sides); a symmetrical oblique folding line is used as a reference line to fold the left and right sides towards the vertical folding line; each side of the paper folded is folded into two fold sides (an inner and outer fold sides) along the oblique folding line; the inner and outer fold sides are folded together to form into an outer wing side; then, the outer end of the paper is folded along an inner-wing oblique folding line to have an outer fold side bent towards the inner triangle side to form into a symmetrical inner wing side.

Abstract: A space filling device for use in a container for cargo shipment to prohibit shifting of the cargo is formed by flat first and second panels, with first and second slots formed in each so that, when assembled, an x-shaped structure is formed. When placed in the container, respective end edges of the panels are supported on the bed of the cargo container while the other of the panels' end edges engage the container's sidewalls. The panel side edges form a pair of x-shaped bases which serve to support the cargo against movement toward the end wall of the container. An anti-slip element may be included on the respective end edges, braces may engage the panels proximate respective end edges, and panel side edge guards may be included to prevent undue wear on the cargo. An auxiliary bearing penal may also be used adjacent at least one of the x-shaped bases.

Abstract: A self-adhesive label comprising a multilaminar label portion, a self-adhesive laminar material extending over, and adhered by its self-adhesive surface to, the multilaminar label portion thereby to form two self-adhesive edge portions thereof on opposed sides of the multilaminar label portion, a backing of release material to which one of the edge portions is releasably adhered and an unadhesive portion which is located on the rear surface of the said one edge portion.

Abstract: There is provided a method for producing extruded, optical-quality, transparent panel units having integral flange members for joining to adjacent, similar panel units. The method includes the steps of extruding a substantially flat strip of suitable plastic material, calendering the extruded strip by pulling it in the still hot, pliable state through a calender, at least the central portion of the strip being smoothened to an optical-quality transparency and the marginal portions of the strip being provided with at least one sawtooth-like, continuous projection on at least one face of the marginal portions, controllably heating the strip at a limited zone on the one face to render the zone pliable, using bending rolls to bend the marginal portions at substantially a right angle, so as to turn them into flange members, the inside corners formed by the bending rolls between the central portion and the marginal portions being rounded, and finally, cutting the flanged panels to required length.

Abstract: A structure for selectively absorbing an oily contaminant from an aqueous environment comprising a plurality of sheets of nonwoven oleophilic fibers arranged in superposition to form a generally rectangular parallelpiped shape, the configuration may be maintained in shape and has a major surface formed by sheet edges so that when contacting an oily containment, the contaminant is selectively absorbed into the structure through wicking action. These structures may be combined to form booms or the like and stacked in a particular configuration for easy storage, transportation and deployment.

Abstract: A generally rectangular sheet is folded upon itself along a first crease that is parallel with two edges of the sheet. The position of the fold is located to create a structure having a region of double thickness but in which one of the edges is offset from the other. The folded structure is folded upon itself along a second crease that is parallel with the first crease to provide a first flap of double thickness that lies upon one surface of the structure. The structure also is folded upon itself along a third crease that is parallel with the first and second edges and within the region of double thickness to provide a second flap lying upon the one surface. In the totally folded sheet, the one of the edges is closer to the center of the sheet than the other edge. A unique dispenser is provided which allows the user to grasp only the one edge so that the sheet product unfolds completely when pulled from the dispenser.

Abstract: A hollow core instrument panel provides the look and feel of a urethane filled instrument panel without the associated disadvantages. A rigid retainer substrate provides a skeletal superstructure. A hollow shell applique is attached to the retainer substrate for providing a decorative exterior. The hollow shell applique includes a resilient upper wall, a lower wall, contoured to matingly engage the retainer substrate, a forward end wall and a rearward end wall. One or more ribs may be provided intermediate the forward and rearward end walls. The forward and rearward end walls are hook-shaped for mechanically clamping about the edges of the retainer substrate. Vent holes prevent pressure build-up within the hollow shell applique.

Abstract: A bellows is formed from a plurality of elemental pieces. A plurality of the elemental pieces are integrally formed as a one piece of continuous sheet material defining borders between the pieces. The border includes partial discontinuous for identifying folding portion of the pieces for mating adjacent pieces. Continuity of adjacent pieces is maintained by bridging portions which serves as positioning means for precisely mating the adjacent pieces for connecting peripheral edges for completing the bellows.

Abstract: A structure for selectively absorbing an oily contaminant from an aqueous environment comprising a plurality of sheets of nonwoven oleophilic fibers arranged in superposition to form a generally rectangular parallelepiped shape, the configuration may be maintained in shape and has a major surface formed by sheet edges so that when contacting an oily containment, the contaminant is selectively absorbed into the structure through wicking action. These structures may be combined to form booms or the like and stacked in a particular configuration for easy storage, transportation and deployment.

Abstract: Foil strip conductor comprising a continuous tape of dielectric material placed adjacent to and facing an equally wide band of a conductive material like e.g. copper foil on one side, and another, wider, dielectric tape facing the conductor on its opposite side, the overlapping edges of the wider of the two tapes being folded around the edges of the conductor and the first mentioned dielectric tape at the same time, and in the process being bonded to the outside surface of the first mentioned tape.

Abstract: A fragrance releasing insert for magazines provides a fragrance sample to readers. The insert of the present invention is formed from a single substrate which has a removable portion which contains the fragrance sample. The removable portion forms a diffusion resistant envelope around the fragrance sample which reduces the possibility of inadvertent contamination of the magazine by fragrance. While the removable diffusion resistant envelope is attached to the remainder of the insert in the magazine, the fragrance cannot be sampled. However, after removal of the envelope along a pair of perforations, the fragrance may be sampled by peeling open the envelope, thus causing a release of the fragrance.

Abstract: A composite resealable outsert and method for making the same, which produces a pressure sensitive applied resealable and clear laminate protected multi-fold outsert that provides product manufacturers with a convenient and economical device to satisfactorily meet increasing requirements for accommodating close retained association of previously printed product use and precautionary information outserts directly with the product by affixment and re-use protected attachment thereof either to the product container or the product itself rather than by the otherwise usual and typical method of simple loosely inserted outsert deposit within the product container.

Abstract: A fire barrier material for use in building construction comprising a sandwich structure have a first and second outer layers comprising a high temperature resistant material having corrugations therein and an intermediate layer comprising a flame retardant fibrous material wherein the corrugation are positioned in the outer layers in a manner which enables the barrier material to be rolled into a bundle in a direction substantially perpendicular to the direction of the corrugations.

Abstract: The use of hollow tetrahedral units as cushioning loose-fill is described. The loose-fill tetrahedra can be made from recycled material such as paper waste by the method of the invention. The loose-fill tetrahedra do not fill the entire space surrounding a packed article, but do support each other during shipping and handling. Apparatus for forming the tetrahedra is described.

Abstract: A reflective safety wrap for use on appendages of joggers or horses includes an elongated elastic fabric strip with a reflective material superimposed thereon. A blind stitch joins the elastic fabric and reflective material. Fastening devices are positioned at each end of the wrap. The method for making the blind stitch is disclosed.

Abstract: A filter insert of nonwoven material in the form of a pleated pack is self-supporting and consists of thermally weldable nonwoven (1). Each of the two outside ends (3) of the pleated pack (2) is hemmed by the nonwoven material (1) forming the pleats, which is folded over in the same direction and at the same time is fixed in tight contact to the corresponding folded of the adjacent pleat end. At the same time the nonwoven material projects beyond the near crease of the adjacent pleat end by 0.5 to 1.5 times the pleat spacing. For manufacture, the flat filter material (1) is first pleated and then a defined pleat spacing (7) is produced by drawing it apart to a limited extent. Then the two outside edges (8) of the pleated pack are gripped between comb-like tools (9) entering pincer-wise into the pleating at top and bottom, leaving the filter material projecting beyond the tools on each side by 1.5 to 2.5 times the pleat spacing (7).

Abstract: Pressure-sensitive adhesive tape having low adhesion backsizes and release coatings that can be written on with solvent and water-based inks, the indicia remaining firmly bonded and resisting smearing. The coatings comprise copolymers of (A) free radically polymerizable vinyl monomer, (B) polar monomer in sufficient amount to impart a hydrated Tg of -15.degree. C. to 35.degree. C. and a difference of at least 20.degree. C. between the hydrated and actual Tgs, and (C) siloxane-based polymer of a type and in an amount that will impart a satisfactory release value.

Abstract: A business form has a plurality of portions used as labels for carrying data or information and such labels are placed on packages or containers in transit. The business form has at least one portion which is folded under another portion and the form includes lines of perforations and slits for enabling the folding and for separation of certain parts. An address label has edge portions secured to the package or container and at least one edge portion is designed to be conveniently released from a release liner carrying the labels.

Abstract: A golf towel set is adapted for attachment to a golf bag or other article. The golf towel has a main towel and an accessory towel. The accessory towel is releasably attached to the main towel. A fastener can attach the main towel to the golf bag or other article.

Abstract: A void filler (14, 16) especially suited for filling large volumes is made from first and second panels (18, 20), each panel having a core (26) sandwiched between face sheets (22, 24). The core is typically a corrugated honeycomb core so that the panel is stiff, strong and yet lightweight. The panels each have generally horizontal upper and lower edges (30, 32) and generally vertical first and second (34, 36) edges. The panels are connected at a hinge (44) along their upper edges. A limiter (50), attached at or near the lower edges, limits the movement of the lower edges away from one another so the panels can move from a flat, storage condition to a use condition, exhibiting a generally inverted V-shape. Two void fillers can be hingedly connected to form an M-shaped void filler assembly (2).

Abstract: Disclosed is an interleaved L-fold towel arrangement which minimizes a number of different types of commonly occurring paper towel dispensing failures. Each towel in the interleaved stack of towels in the present invention is comprises of a sheet which has been folded in half to substantially create a two-ply arrangement. A second fold is imparted to the towel substantially to the first fold thereby creating a lead flap and a trailing flap. The lead flap begins with the first fold and thereby creates a tab end which is two-ply and which will not delaminate on dispensing. The user will thus always be grasping a two-ply product as it is being dispensed thereby minimizing tear-out and tab-out failure.The lead flap preferably has less width than the trailing flap, thus limiting the amount of deformation which must be imparted by the trailing flap to the lead flap next to be dispensed to cause said lead flap to be drawn through the dispensing opening of a dispenser.

Abstract: A formed panel construction and method are provided for portable acoustic partitions of the type which are assembled and configured to create workstations in open office plans. Each partition panel includes a freestanding, open frame with a pair of formed cover panels detachably connected to the opposite sides of the frame to enclose the partition. Each cover panel comprises a laminated composite sheet, which includes a sound absorbant backing sheet constructed from heat fusible fibers, and an overlying upholstery sheet with a finished exterior surface. The composite sheet is heated to soften or plasticize the heat fusible fibers, and is compressed and molded while heated to a predetermined geometrically solid shape, such as a five-sided panel having a flat face and four marginal flanges extending at an angle therefrom.

Abstract: A converter mechanism and method for producing a relatively narrow width and small size cushioning dunnage product of pad-like form, from sheet-like stock material. A conversion kit comprising a funnel-like chute member and a coacting elongated generally rectangular shaped (in top plan) bar former is provided for conversion of a known cushioning dunnage converter into one which can produce the relatively narrow and small size pad-like cushioning dunnage product of the invention. The bar former has its forwardmost end disposed generally adjacent the exit end of the funnel-like chute member, with its rearward end extending rearwardly of the entrance to the funnel-like chute member.

Abstract: A fire barrier material for use in building construction comprising a sandwich structure have a first and second outer layers comprising a high temperature resistant material having corrugations therein and an intermediate layer comprising a flame retardant fibrous material wherein the corrugation are positioned in the outer layers in a manner which enables the barrier material to be rolled into a bundle in a direction substantially perpendicular to the direction of the corrugations.

Abstract: A folded towel and a method for making a folded towel comprised of a composite product including one surface formed by smooth tissue and an opposite surface formed by an absorbent dry formed fabric product.

Abstract: A sheathing for extending members having either a rectangular cross section or a circular cross section is formed of sheathing sections wherein the sheathing sections have two positions. In a first substantially flat position the sheathing sections are convenient to stack and when stacked the surfaces of adjacent stacked sheathing sections are substantially in contact with each other. In a second folded position the sheathing sections define an enclosed hollow space for disposing an extending member therein and surrounding the extending member to protect vehicles or other objects striking the extending member. Articulating hinges are provided for transposing the sheathing sections from one of these positions to the other. The sheathing sections are provided with dove tailing interengagement for joining sections of the sheathing to each other. Inserts brace the walls of the sheathing against extending members inside the space defined by joined sections.

Abstract: A coil of stock material from which air turning vanes are formed. The material includes a central striated bend area which facilitates the formation of increments of the material severed from the coil into desired arcuate configurations. An air guide assembly formed of the vanes of the stock material is likewise described for conducting air with high efficiency about the bends between adjacent ducts.

Abstract: A packet of toweling for single use adapted to be dispensed for hand drying from an apparatus having a supply chamber from which the toweling is manually withdrawn for use and a storage roller operable in response to the withdrawal of toweling to roll up and store the used web toweling, said packet comprising a zigzag folded, continuous web of paper material extending between first and second web ends, said paper material having a reinforcement comprising a fabric of synthetic threads for providing said web with a tensile strength sufficient to prevent tearing during withdrawal, use and rolling up, said web having an adhesive area of the exposed surface adjacent one of said ends by which an additional, similar packet may be joined to said packet, said adhesive area having a removable cover.

Abstract: A thermal insulation batt is provided which is comprised of a layer of bulk thermal insulation material; a vapor impervious thermoplastic facing sheet adhesively bonded to the layer of insulation material; paper tabs containing a fold line securely attached along each of longitudinal sides of the facing sheet or by having dual foldable paper strips enclosed within a folded back portion of the facing sheet so as to provide a deadfold characteristic for the tabs. The insulation batts are conveniently packaged with the dual tabs folded downwardly adjacent the facing sheet, and at installation the dual tabs are folded outwardly without snapback and are attached onto spaced apart structure members such as studs of a wall.

Abstract: An image-impressing device impresses on an axially elongate substrate surface by flat-bed table-top printing an apparently continuous major stripe of constant width and straight edges in excess of the length of the image-impressing device by repeatedly moving the image-impressing device to successive slightly overlapping and generally longitudinally aligned lengths of the substrate surface to form a longitudinally continuous plurality of minor stripes of generally constant width and generally straight edges not in excess of the length of the image-impressing device. Each of the minor stripes is formed with at least one inwardly tapered end overlapping the end of an adjacent minor stripe to enhance the illusion of a continuous major stripe of constant width and straight edges by enhancing the apparent longitudinal alignment of the overlapping ends.

Abstract: A flexible, cushioning dunnage product producible on a converter mechanism from a roll of sheet-like stock material, such as biodegradable paper. As the stock material is pulled off the roll by the converter, the edges of the stock material are rolled inwardly to form pillow-like portions which are urged by the converter mechanism laterally inwardly with respect to one another into confronting abutting relation, with the pillow-like portions being then connected together along their engaged abutting sides by in the preferred embodiment, transversely extending coined sections extending transversely of the product and defining a generally central connecting portion running in a direction lengthwise of the product.

Abstract: A package for meat products and other oily foods and similar products marketed in stores and suitable for use to heat or cook the contents by microwave radiation comprising a absorbent insert having as basic elements a cooking surface of waxed paperboard or the like and an absorbent underlay. The cooking surface on which the food is laid is provided apertures so that fats and liquids released from the food during cooking may readily pass therethrough and be captured by the absorbent underlayer.

Abstract: A pressed ceiling for use in vehicles comprising a base material of corrugated cardboard heat-press formed to a predetermined form, a surface skin material heat-pressed to the inner face of the corrugated cardboard base material thus-formed and a layer of heat melting adhesive interposed between the corrugated cardboard base material and the surface skin material, wherein the heat melting adhesive layer is made thicker at the peripheral portions of the press formed corrugated cardboard base material to restrain or prevent the spring-back of the press formed corrugated cardboard base material at its peripheral portions when it has moisture again.

Abstract: Apparatus for dispensing a continuous web of product, such as a towel (20), from a zigzag folded packet (11A, 11B), which is kept in supply chamber (10). After use the towel (20) is rolled up into the roll (23), which is regularly removed from the apparatus. The packets (11A, 11B) are provided on the end layers with strips (29A, 29B) that are adhesive on both sides, which strips make possible the mutual coupling of the packets. The packets consist preferably of paper that is strengthened with filaments of synthetic material, which paper is intended for single use, but the pockets can also consist of textile that can be reused after cleaning.

Abstract: A resilient pad positionable on the floor of an automobile below and slightly behind the driver's accelerator pedal. When a woman is driving the automobile the heel of her shoe will engage the upper face of the pad while she is applying foot pressure to the accelerator pedal. The rear edge of the heel will sink into the pad surface, such that a large pad area will exert a relatively low unit area reaction force against the shoe heel. The invention minimizes premature wearing away of the shoe heel that can occur, over time, when the rear edge of the shoe heel is repeatedly pressed down against a relatively rigid automobile floor surface.

Abstract: A banner including a bonded nonwoven polyolefin film-fibril sheet having front and back surfaces and having two side edges intersecting top and bottom edges to define four corners. The side edges are generally linear and are folded-over onto the back surface of the sheet and secured with double-faced adhesive tape to form a laminated edgefold with the double-faced adhesive tape sandwiched between two layers of the sheet. The front surface of the sheet has at least a first coating of surface-sealing polymer and means are provided adjacent each corner for attaching cords to the edgefold for hanging the banner.

Abstract: A folded sheet product having two terminal portions with free edges midway of the paper product and having a substantially uniform thickness across the full extent thereof when folded.

Abstract: A sheath structure (10) for use as a backrest for a chair or as a seat, envelope, wallet, purse, handbag, panel, etc., comprising pliable sheet material (32) stretched on a frame (20)and presenting spaced-apart front and rear exterior surfaces (33, 39). The frame is made up of at least two spaced-apart front and rear frame elements (26, 24), each corresponding to the front and rear exterior surfaces (33, 39). The frame elements define an intermediate space therebetween. The sheet material (32) forms the front and rear exterior surfaces (33, 39), extends over the frame elements (26, 24), and is tucked in within the intermediate space, and tension means, such as elastics (38), cooperate with respective tucked-in portions of the sheet material (32) so as to stretch the sheet material on the frame.