Abstract: A building block system includes one or more building blocks and one or more wheels, each building block including a first elongate portion extending in a longitudinal direction, a second elongate portion extending in that longitudinal direction, an intermediate portion connecting the first elongate portion with the said second elongate portion at a middle position thereof, a first end portion extending in a transverse direction, perpendicular to that longitudinal direction, from the first elongate portion, at a side thereof opposite to the intermediate portion, and at a middle position thereof. A second end portion extends in that transverse direction, perpendicular to the longitudinal direction, from the second elongate portion, at a side opposite to the intermediate portion, and at a middle position thereof. It thus includes six protrusions and two voids, each void defined between an end of the first elongate portion and an end of the second elongate portion.

Abstract: A stationary massage device, system and corresponding methods are used for self-administrated or assisted soft tissue strain release (including trigger point therapy, strain-and-counterstrain therapy and neuromuscular release). The massage device comprises a body, wherein the body may include branches, each having flat surfaces, edges, ridges or corners. The surfaces, edges and ridges may be pushed along the myofilament direction of the soft tissues to produce pressing, rubbing, stretching and pulling actions on the soft tissues as stripping massages. The system can be configured to form different geometric shapes, and made of different materials of different firmness. The system can be further configured to perform unheated, or heated massages; and cooling treatments. In addition to being used alone, the system can be mounted on a piece of wall, a standing frame, furniture or a garment.

Abstract: A game set allows building wall structures with magnetic tiles that have magnets located around the peripheral sides or edges. Since the tiles are held only by magnetic force, they are susceptible to buckling by application of perpendicular forces and to prevent such buckling, a plurality of thin holding strips are provided that extend over the joint, magnetically held edges of the magnetic tiles and prevents buckling. The magnet set also includes additional accessories, such as figurines that can be magnetically adhered to the wall structures, electrical lighting that can be adhered to the wall structures and drawing sheets that can be adhered to the wall structures.

Abstract: The 3D models includes parametric data and metadata. A software enables a user to specify search criteria for a selected product among a plurality of products whose 3D models are stored on the data storage device. The search software returns a list of product(s) matching the search criteria. The user selects a product and the 3D model of the selected product is streamed to the user software. The 3D model is then displayed to the user, who now can interact with the 3D model by selecting, hovering over, or decomposing the 3D model to reveal parts or subassemblies of the product in one or more stages of decomposition. Finally, e-commerce software communicates with the user software allowing the user to initiate an ecommerce transaction with respect to the parts or subassemblies depicted in the 3D model of the selected product.

Abstract: A modular play structure is disclosed. The play structure has a plurality of wall units that can interchangeably couple to form a modular playhouse. The wall units are coupled together by a mating structure. Some embodiments have a separate connector that couples wall units together at the edges of the wall units. Some embodiments have accessories coupled to the wall units at accessory openings. Some embodiments have decorative façades configured to removably attach to the plurality of wall units.

Abstract: A display apparatus comprising a plurality of planar elements which interconnect to form a display board is described herein. The display apparatus includes a box configured to support the display board in a substantially vertical position. The box is also configured to enable the plurality of planar elements to be packed away inside the box for storage. A method of assembling the display apparatus is also disclosed.

Abstract: A modular structure includes a base assembly; and a roof assembly coupled to the base assembly, wherein the structure is selectively reconfigurable between a table configuration and a playhouse configuration.

Abstract: A building block, comprises a plurality of basic units and a plurality of connectors. Each connector is used to connect each two basic units. The basic unit is a hexahedron. Each face is set with a plurality of connecting holes and a slot. The connector inserts into one connecting hole on one face of the basic unit, and comes out from another connecting hole on the opposing face through the slot to connect with another basic unit. The connecting design not only increases the ways of connecting each two basic units, but also ensures that one basic unit has at least one connecting hole for connecting with another basic unit. The present invention is help to cultivate children's ability of multiple perspectives thinking and ability of 3D space thinking.

Abstract: A multi-purpose surface covering for interactive play and display is disclosed. The play or display environment, or surfacescape, is created by the user by combining the various components of the invention. The components interact so that they may be scaled to various sizes for use on floors, walls, table or counter tops, or other surfaces, and can be assembled outward as well as upward for play or display in multi-dimensional settings. As a play environment, it provides a set of easily interchangeable components that allow an unlimited number of colors, textures, shapes, and articles to be incorporated into the system. When displayed horizontally or vertically, this invention provides the capacity for interchangeable display of inserts, which may include but is not limited to artwork, advertising indicia, educational material (numbers, letters, etc.), instructional information, notices, or an infinite number of other materials which can be readily and changeably viewed.

Abstract: A modular grid structure and method of construction for a playground, wherein the position of playground modules is easily established and rearranged within a array of securement locations and in relation to surrounding modules. The grid comprises a permanent or temporary foundation having a plurality of playground module support locations aligned in a grid or array, such that the playground may be constructed by placing the support posts of the module in connection with the foundation support locations. The disclosed support locations comprise embodiments that permanently secure the posts of a playground module using a pin-locking support hole, or alternatively a temporarily support means to movement for a shorter period while allowing swift setup and breakdown of the entire assembly, such as for temporary playgrounds.

Abstract: The invention is a set for building toy houses, in particular doll's houses and the like, including wall panels (1, 2, 3, 4) with and without openings for windows and doors, and coupling elements (5, 6, 7, 8) for assembling the wall panels. Each wall panel has a reduced thickness section in each corner thereof for insertion into a coupling element. The reduced thickness section extends on both sides of the wall panel as a plane, recessed section (10). Each recessed section extends between staggered edges (11) and is provided with a depression (12, 13) provided centrally on both sides thereof, the coupling element being configured with parallel lateral faces (14, 15) for enclosing the corner area.

Abstract: A building toy component comprises a main body having opposing top and bottom surfaces and a thickness. The building toy component also comprises at least one slot that opens on a peripheral edge of the main body, wherein a nominal width of the slot is substantially equal to the thickness of the main body. The slot includes opposing sidewall having at least one engagement strip within each slot. In particular, each engagement strip extends traversely across a sidewall of the slot and tapers along a height of the sidewall.

Abstract: A toy play set comprising user designed base plate and structure plates, story telling media, a master doll and accessory toy articles is provided for a child to rebuild a toy playing scene after reading a scene base story, and then for the child to build the play set according to his/her imaginative capability. Interactive audio and/or visual responses are provided when a master toy member touches an accessory toy member for providing further fun in playing the custom designed story scene based play set.

Abstract: The present invention is a doll house that can be assembled and disassembled by a small child. The rooms, once assembled, can be stacked upon each other to form large multiple story houses or stacked beside each other to form castles and palaces. The rooms can be large and have large openings for fitting larger dolls and larger doll furniture. The rooms can be easily disassembled for easier storage. The rooms form structures that are safe for children because the rooms self-locate on top of the lower room section. The rooms also have a locking feature that prevents a room from sliding off a lower room by preventing relative lateral motion. These features make the doll house safe for children to build and play with.

Abstract: A modular building construction system including a plurality of free-standing, molded polymer components that may be assembled to form a weatherproof structure. Components include a center, corner, interior passageway, door, and roof panels, as well as supporting beams that may be arranged in a nearly infinite number of configurations to easily, quickly and inexpensively form nearly any structure desired by the user.

Abstract: A playground roof system having the capability of being attached to different diameter support members is provided. The frame of the roof structure is roto-molded such that two different sized openings are provided at each corner of the frame, each opening in the same area, such that the roof is interchangeable in different playground systems. The roof system further includes openings formed in the frame such that a fastener can be threaded therein fastening the frame and support members together.

Abstract: The present invention provides a system, or kit, of injection molded panels having integrated connectors which combine to form an enclosure, commonly in the form of a utility shed. The panels are formed of injection molded plastic to interlock with one another without the need for separate I-beam connectors. The ends of the wall panels have cavities to accept both roof and floor outwardly projecting locking bosses for interlocking cooperative engagement which serve to rigidly connect the components together. The symmetry of the wall, roof, floor and door components also minimizes component shapes and simplifies enclosure construction.

Abstract: A corrugated cardboard constructible toy has a set of recyclable shipping boxes and comprises an outer box that in its entirety forms a main part of the toy besides temporary uses for shipping the toy to and from a toy user. One or more inner boxes of corrugated fiberboard are contained in the outer box during shipping and then deployed to mate with the outer box to provide a subassembly of the toy with a predetermined rigidity. Auxiliary forms of corrugated fiberboard for mating with the outer and inner boxes to selectively support the toy subassembly as it differentiates into a model figure or building for a child to actively play on or in. A number of dowel fasteners may penetrate walls of the fiberboard to maintain the integrity of the toy.

Abstract: A kit for a doll house which enables a ready and facile assembly requiring no sanding, gluing, nailing, screwing, painting or other handicraft skills. The kit includes a floor foundation board, configured sidewalls, front walls and interior walls, including windows and doors, as appropriate, which is finished including trim and paint. The sidewalls, front walls and interior walls are readily assembleable in grooves in the floor foundation and secured upright by means of a stabilizer bar. The walls include integral grooves for intermediate floors, which are also finished to emulate floor coverings normally found in a house. The roof is also similarly assembleable and includes a pivoted rear section to enable the roof to be folded back to enable access to the interior of the doll house.

Abstract: A house-building toy comprises element blocks that include floor foundation blocks (2) functioning as the foundation of a house model and structuring a floor portion of the house model, wall blocks (3) structuring a wall portion of the house model, roof blocks (4) structuring a roof portion of the house model, and floor panel blocks (5) structuring on the floor foundation blocks (2) the ground and a floor surface in the house. Hole portions communicating with the element blocks are formed at joints between the floor foundation blocks (2) and the wall blocks (3) and at joints between the floor foundation blocks (2) and the roof blocks (4). Wires (W) for supplying electricity, for example, for lighting are laid from the outside to the inside of the house model.

Abstract: The present invention concerns a construction game to make buildings at a reduced scale providing the user with all the necessary elements in order to obtain a sample at real scale.

Abstract: A housing structure includes a first plurality of wall panels which form a lower course and a second plurality of wall panels which form an upper course. Each of the wall portions is generally rectangular and includes integrally formed interlocking portions which facilitate attachment of adjacent lateral edges of the wall portions of the first plurality to each other. Integrally formed interlocking portions facilitate attachment of the panels in the lower course to the panels in the upper course. In addition, rectangular roof panels are provided to enclose the housing structure. The interlocking portions enable the panels to slide into an interlocked engagement configuration thereby forming a rigid structure without the need for tools.

Abstract: A system and method for simulating a wide variety of different toy furniture items including a plurality of three-dimensional predetermined shaped members wherein at least some of the predetermined shaped members are adaptable to be positioned and repositioned adjacent to other shaped members in a plurality of different configurations to simulate a plurality of different furniture items. The present system and method further includes providing a plurality of slipcovers having indicia associated therewith which are shaped and dimensioned respectively to be positioned over at least one of the plurality of shaped members to simulate the particular furniture item or other home/business furnishing depicted on the slipcover, and providing at least one wall board having indicia associated therewith for simulating a particular room setting, the wall board being used in conjunction with the system components to simulate different room settings.

Abstract: An instructional kit suited for teaching the necessary materials, methods and techniques for conventional stick built wood structures is provided. In accordance with the present invention, a kit for stick framing a true representation of a scale house model includes all of the framing members required to build a scale model house. Specifically, the kit includes precut framing members representing each of the correct members used in actual residential construction such as studs, rafters, sills, top plates, headers, etc. Also included in the kit are wall layout plans and detailed instructions regarding the proper construction of a residential house. The intent of the kit is to provide a self contained educational tool for teaching the necessary understanding of structural wood framing.

Abstract: A three dimensional model comprising a substantially planar base mounting member having opposite top and bottom surfaces; a first building structure adapted to be mounted on a portion of said top surface of said base mounting member, said at least one building structure assembled from a piece of foldable, self-supporting sheet material, said piece of foldable, self-supporting sheet material having fold lines thereon, and when folded along said fold lines forms said building structure; and a second building structure adapted to be mounted on a portion of said top surface of said base mounting member, said at least one building structure assembled from a piece of foldable, self-supporting sheet material, said piece of foldable, self-supporting sheet material having fold lines thereon, and when folded along said fold lines forms said second building structure.

Abstract: A modular pet house includes a housing including a peripheral wall comprising a front wall, a back wall, a first side wall and a second side wall. The peripheral wall has an upper edge and a bottom edge. The front wall has an opening positioned therein extending upwardly from the bottom edge. A plurality of mountings is selectively mountable in the housing. A panel has an upper side, a lower side and a peripheral edge. The panel has an opening extending therethrough. The panel has the same shape and size as an interior perimeter of the housing. The panel is selectively positionable on the plurality of mountings.

Abstract: A doll house includes a modular, box-like structure having a floor, a top surface, a rear wall, two side walls and an open front. Wall panels are provided with two surfaces with different designs thereon and each wall panel can be installed to fully cover a respective wall of the structure. Either surface of a panel can be provided to be visible, and the wall panels can be removed from the walls and re-installed with different surfaces revealed. Similarly, ceiling and floor panels each with two surfaces having different designs can be installed on the floor and top surface, respectively. A front dust cover can be placed over the open front. The doll house may be used with stacking pins to enable for the stacking of multiple modules.

Abstract: A modular house toy includes a fixed supporting structure made of a solid floor, a solid ceiling, a solid back wall connecting the floor to the ceiling, and an open arch connecting the floor to the ceiling. The back wall and/or the arch permanently connect the floor to the ceiling in respective connection planes. A modular house toy configuration includes at least two fixed supporting structures. One fixed supporting structure is removably connected to another in six positions. Preferably, the floor and the ceiling have the same shape and the back wall and the arch have the same shape to allow repetitious and modular interlocking of one modular house toy to another module house toy. Wall and arch extensions are inserted into floor depressions and other wall and arch extensions are inserted into ceiling depressions to connect the floor to the ceiling.

Abstract: A truncated triangular inclined climbing wall is attached to a wooden play structure, and is tilted at about a forty-eight degree angle against the play structure, and is fastened by a flange to an elevated deck which is accessible through a wood framed inlet. The climbing wall is staked to the ground, and narrows from a wide, ground-engaging, base, to a narrower summit, which is immediately adjacent the framed inlet. The climbing wall is formed with a number of rock-simulative ledges, which progress from the base to the summit. Each molded ledge preferably has a child-graspable hand grip integrally molded in the riser. The top surfaces of the step-like ledges define treads which are inclined from the horizontal to direct the child's foot inward toward the climbing wall rather than away from the wall and off the structure.

Abstract: A structure-forming construction element for a toy log building set, such as those sold under the well known “Lincoln Logs”. The construction element, typically a molding of plastic material, is formed with a plurality of adjacent sockets for the reception and gripping of log elements in parallel, side-by-side relation. In a typical form, the construction element is positioned on a support, and the log elements are oriented vertically in the sockets provided. A second, similar construction element may be placed on top of the upper ends of the logs. Side walls of the sockets can be notched to provide a castellated appearance, such that a structure with vertically spaced construction elements and vertical log elements has the appearance of a castle tower.

Abstract: A modular building model is provided. The modular building model includes a base and a lower level module disposed on and engaged with the base. An upper level module is disposed on and engaged with the lower level module. The base includes a releasable securing mechanism that secured the upper level module to the lower level module. The releasable securing mechanism permits easy assembly and disassembly of the model for travelling and storage purposes, and variation of mold buildings.

Abstract: A building set for a toy building comprising a number of building module frames (1,1a,1b,2) and a plurality of fittings (10,17,18), and wherein each of the building module frames (1,1a,1b,2) comprises a bottom plate (3,4,19) with a superstructure that defines the walls and ceiling of the building module frame (1,1a,1b,2), and wherein each bottom plate (3,4,19) is provided with coupling means (12) for interconnecting adjoining building module frames (1,1a,1b,2). By arranging the coupling means (12) on the top surface of the bottom plate (3,4,19) and by arranging the coupling means (12) to be releasably interconnected with complementary coupling means (11) on the underside of the fittings (10,17,18), a stable and secure coupling is obtained that possesses much holding force without much force being required to interconnect the building module frames.

Abstract: The modular lattice substructure for a playing structure, such as a toy building set, includes a planar frame having a plurality of exterior corners and a column having a height greater than the height of the frame. The column includes a lower portion and one of the lower portion of the column and a corner of the frame have a receptive connector thereon for removable attachment to a protrusion connector on the other of the lower portion of the column and a corner of the frame. In this manner, a single frame can be attached to a plurality of columns, and a single column can be attached to a plurality of frames in order to form a modular lattice substructure for a playing structure.

Abstract: A toy building system for the construction of e.g. in-door settings and furniture element groupings, comprising a number of substantially box-shaped fittings (1,2,3) with a top surface, a bottom surface and a number of lateral walls, comprising a front with furniture-like functional parts, such as doors, shelves, etc., and a back (4) with coupling means (5,6) and wherein each fitting (1,2,3) has at least two functionally identical coupling means (5,6), said coupling means (5,6) comprising coupling means (5) that protrude a distance from the back (4) of the fitting (1,2,3), and wherein the coupling means (5,6) are arranged at a mutual modular distance and provided in such a manner that the fittings (1,2,3) may be interconnected back (4) to back (4) in at least two different positions relative to each other.

Abstract: A building set for a toy building comprising a number of building modules (1) which each defines a space, said building modules (1) being so designed that they may be stacked or arranged next to each other as desired for the construction of single- or multi-storey toy buildings, and having means (6,7) for releasably engaging with one or more wall elements (5) in the sides of the building modules (1) irrespectively of the mutual positioning of the building modules (1). Since the columns (3) support girders (4) which define the periphery of the top plane of the building modules, said girders (4) being so arranged that unimpeded access to the building module interior (1) is provided, it is now possible to construct toy buildings with more different plan arrangements compared to the prior art without impeding the access to the building module interiors.

Abstract: According to the present invention a building element comprises a generally planar panel defining at least one substantially straight side end and a first connecting lug extending co-planarly to the panel from the substantially straight side end. The first connecting lug extends along only a portion of said straight side end, and a slot is provided in the form of an elongate aperture extending partly into the first connecting lug or partly into the panel adjacent to the first connecting lug. The slot extends adjacent to the straight side end and parallel thereto, and the slot is open at one end thereof. The arrangement is such that two building elements with slots being open at opposite ends can be attached to each other by positioning the panels at right angles to each other and sliding the slots over each other in a direction along the straight side ends in order that the slots engage the elements. The invention also relates to structures formed by using the above elements.

Abstract: A new Doll House Swivel Basement Add-On System for providing a basement in combination with a swivel base for an existing doll house thereby allowing a user to conveniently access all sides of the existing doll house. The inventive device includes a basement structure, a swivel base, a vehicle ramp, a porch, snap-on stairs, and a securing rim. The securing rim is for engaging a bottom portion of the exiting doll house. The swivel base allows the basement structure to rotate along with the existing doll house to allow the user access to all sides of the existing doll house.

Abstract: A toy building set containing wall elements for the construction of facade structures. The building set includes at least one of each of two types of wall elements: a first type of wall element formed with one opening having hinge parts for suspension of plate elements; and a second type of wall element formed with a plurality of openings, each having hinge parts for suspension of plate elements. The height of the openings in each type of wall element are equal so that the plate elements may fit into the openings of either type of wall element.

Abstract: A children's play garage having a plurality of detachably connected walls, a roof, a toy compartment, and an articulating vehicle door is disclosed. The play garage further includes an opening for accessing the toy compartment from the exterior of the play garage. Alternatively, the play garage includes an articulating user door, and window openings in one or more walls, the vehicle door or the user door. The vehicle door is hinged by hinges having polygonal bores and polygonal pins to allow the door to be self-supporting in an open position.

Abstract: A construction kit comprises a base panel having a peripheral frame, a rear wall for locating on the base panel against a rear portion of the peripheral frame, and side walls. The side walls have rear edges for engagement in grooves provided at opposite ends of the rear wall, and studs at the bottom of their front edges for engaging in holes in the top face of the peripheral frame of the base panel.

Abstract: A toy element having a thin, flexible material as well as a holder for it is provided. The toy element may be used in the construction of a doll house for which it constitutes a curtain and the suspension, in the form of a rod, for the curtain. An elongated cavity having a longitudinal slot through which the flexible material extends is provided in the holder. A locking part couples to the holder and secures the rod holding the curtain in position.

Abstract: A framed modular miniature front for a shelter, which front has a header, threshold and side rails together with an inner wall portion mounted on the surrounding frame. A full length door opening is formed in that wall adjacent a side rail of the modular frame. One or more dutch-type doors are swingably mounted in the opening by dowel hinges. This door opening is covered by a door pinned at the hinge side by a dowel pin that is seated in slightly oversized openings drilled lengthwise into the hinge side of the door. A swing space provides easy and full opening of the hinged door.

Abstract: A walk-in child playhouse having pivotally attached seating surfaces. In one embodiment, the walk-in child playhouse comprises an enclosed rotomolded plastic structure having walls, a roof, and at least one chair or seat member pivotally attached to the playhouse. In another embodiment, the walk-in child playhouse has a garden party theme in which the roof has a canopy portion overhanging the rear of the house. Under the canopy are two chairs or seat members pivotally connected the rear wall and the roof via a pair of continuous bosses, the rear wall also having a substantially horizontally extending table disposed between the chairs and under the canopy. In another embodiment, the playhouse comprises a series of double-walled hollow parts that are interconnected by a unique snap interlock system. In yet another embodiment, the playhouse comprises a lateral connection member for joining various wall panels at a lower portion thereof.

Abstract: A toy castle formed from a plurality of assembly pieces includes a front wall, two side walls and a rear wall. Four corner towers connecting the castle walls. A gate tower is connected to the front wall and extends away from the interior of the castle. A central keep is connected to the rear wall and extends into the interior of the castle. A plurality of wall walks suspended from the front, side and rear walls extend around the inside perimeter of the castle walls. Each assembly piece is formed with interlocking elongated slots for connection with other assembly pieces, such that no special tools or fasteners are required.

Abstract: A horse stall gate manufactured from a lightweight polymer. The gate includes a plurality of ventilation slots designed to provide optimum airflow to the horse stall while only nominally reducing the strength of the gate, the slots being sized smaller than the horse's hooves. The gate is formed by rotational molding resulting in a hollow construction in the areas between ventilation slots and greatly reducing the weight. Rotational molding also produces a smooth exterior surface with rounded edges and corners to eliminate the chance of injury from sharps. The gate is reversible so that it may be hinged to either side of a stall doorway and includes a central indent in the upper edge for the horse to lean out of. Finally, the raw material can be provided in any color prior to rotational molding completely eliminating the expense and hazard of paint.

Abstract: A construction kit for toy building structures includes a plurality of basic planar logs having a slightly rounded edge on the lower face and male couplings on the lateral ends thereof. A plurality of alternative planar logs with a brick like patterned surface and male couplings on the lateral ends thereof are interchangeable with the above mentioned logs. The logs may be interconnected with angular connecting blocks having female receiving slots on four adjacent sides with a recessed area and a raised neck on opposing ends to accommodate adjoining blocks. The plurality of planar logs may be interconnected with architectural fixtures having receiving slots on the lateral edges. Recessed areas at angular points of the singular roof unit interconnects with the raised neck of the connecting blocks to form the skeletal structure. Raised receiving slots on opposing sides of the angular roof top and indentions along the roof line accommodate roof fixtures.

Abstract: This invention pertains to a foldable, collapsible doll house having a first foldable frame section, a second foldable section forming a partitioned attic, and a third foldable roof section. The three foldable sections are fastened together in such a manner as to provide a model doll house which is easily constructed or taken apart.

Abstract: An architectural model simulating a large sports stadium. Major architectural and structural elements are reflected as single or plural part scaled components, such as base, playing field, seats, general structure defining the overall shape, and, where appropriate, domed roof. Certain accessories are removable to enable reconfiguration for different sports events, these accessories including scaled signs, lights, goal apparatus, scoreboard, and the like. Similarly, exterior or other architectural components are provided in different forms reflecting various appearances and stages of construction at different historical eras.

Abstract: A block toy has a plurality of regular hexahedral blocks each having a relief side having a relief surface, a printed side having a printed surface, and an apertured side having an aperture defined therein. A plurality of smaller blocks, which have sizes smaller than the regular hexahedral blocks, are each positionable on the apertured side of one of the regular hexahedral blocks when the smaller blocks are oriented in one direction. The smaller blocks can be fitted in the apertured side of one of the regular hexahedral blocks when the smaller blocks are oriented in an opposite direction.

Abstract: The invention of rapidly erectable housing units providing a number of properly shaped and interfitting wall sections. Beside the wall sections the units include interlocking or laid-uproofing applied to truss rafters. interlock to the erected walls. The wall sections are provided with structural base plates and headers for interlocking the walls into sturdy non-rackable condition to maintain the stability of the unit. The interfit of the wall sections may be in several forms such as matching, slotted grooves to afford sliding connection between sections and may also include mortise and tenon arrangements on the ends of sections with the tenon passing through the mortised area for the attachment of a locking element on the extending end of the tenon as well as the mortise position. The mortise and tenon arrangements, particularly at corner areas of the unit may include a plurality of interfitting elements rather than a single arrangement which will allow for more secure joining of the sections.