Structural connectors used as a component to construct an arch including a plurality of closely adjacent, polygonal rows of stringer beams. The multiple row polygonal arch is a low-cost, general purpose support structure for bridges, shelters and arbors applicable to many cost-, time- or environmentally-sensitive situations. The structural connectors may be a Y-shaped connectors with three brackets, two upper brackets and a lower bracket, which collectively enable a union of three beams forming one node of the multiple row polygonal arch. Using these Y-shaped connectors to join the beams at each node creates the arch structure, and additionally provides the features of cantilevering, modularity, generic component shape, reusability and safety. Structural connectors are applicable to a variety of structures such as pedestrian and vehicular bridges, shelters, arbors, as well as jewelry, furniture and toys. Other aspects, embodiments, and features are also included.

A building panel is provided. The building panel includes an exterior wall portion, an interior wall portion, a pair of opposing sidewalls, a first end portion and an opposite second end portion. The pair of opposing sidewalls spacing apart the interior wall portion from the exterior wall portion to define a cavity therebetween. The exterior wall portion, the interior wall portion and the pair of opposing sidewalls are arcuate in shape to define the building panel. The first end portion has a slip lock slot extending between the pair of opposing sidewalls. The second end portion has a slip lock tab member extending between the pair of opposing sidewalls. The slip lock slot of the building panel is configured to receive the slip lock tab member of a second building panel to adjoin the first and second building panels in a continuous fashion.

A panel member for a cyclorama includes a concavo-convex body having integrally-formed first and second side portions with an intermediate portion therebetween. The first side portion, the second side portion, and the intermediate portion have a radius of curvature in a Y-Z plane, and the first and second side portions have a radius of curvature in an X-Y plane that is different from the radius of curvature in the Y-Z plane to uniformly reflect or diffuse sound and light incident on the panel member.

A beam system and method of erecting a supporting arch enables large roofed structures to be erected quickly and economically. The method includes aligning a plurality of structural elements longitudinally; connecting upper corners of the structural elements to upper corners of adjacent structural elements, wherein adjacent lower corners of the structural elements remain unconnected; elevating first and second structural elements in a middle of the supporting arch; connecting lower corners of the first and second structural elements together; elevating third and fourth structural elements adjacent the first and second structural elements, respectively; and connecting lower corners of the third and fourth structural elements to lower corners of the first and second structural elements, respectively.

The application relates to a standalone portable protective enclosure that forms a complete envelope surrounding and protecting its contents from the extreme forces of nature and man. The invention can have other uses other than a protective enclosure and will not be out of place in a living room of a home. The invention pertains to a protective enclosure that is resistant to high velocity projectiles and massive blunt forces. More particularly, this invention relates to a protective enclosure that can be site assembled from matching parts and may be disassembled and relocated to different locations.

The invention relates to methods for producing parallel-perpendicular spherical systems and can be used to assemble structures in engineering, construction or other arts. The method comprises the following operations: first, selecting of at least three identical elements; determining of at least one connection point on the first element; at least, determining of the connection point on the second element; connecting of the elements at certain points of the junction in such a way that the planes passing through the first element and the second element are perpendicular; selecting of the next element; determining of its points of intersection with first and second elements; connecting of the element with the first and second elements at the intersection points in such a way that the planes passing through the elements are mutually perpendicular, wherein meeting of the condition that the first element is parallel to the fourth one, the second element is parallel to the fifth one, and the third element is parallel to the sixth element. The claimed solution simplifies the assembly of three-dimensional objects and increases their reliability.

A portable modular building structure that includes a plurality of sections assembled adjacent one another. The sections include molded fiberboard panels, that optionally include interior plenums. In an embodiment, each panel has an upwardly curving profile, and mirror-image sections are attached to one another via a fastener, that may include tape or other mechanical fastener. The sections are positioned end to end, with the number of sections determining the overall length of the structure. An optional end section of the structure may include wedge shaped sections positioned end to end, forming a curved end.

A panel member for a cyclorama includes a concavo-convex body having integrally-formed first and second side portions with an intermediate portion therebetween. The first side portion, the second side portion, and the intermediate portion have a radius of curvature in a Y-Z plane, and the first and second side portions have a radius of curvature in an X-Y plane that is different from the radius of curvature in the Y-Z plane to uniformly reflect or diffuse sound and light incident on the panel member.

A chemical toilet cabin includes a platform (3), vertical side walls (4, 5, 6, 7) connected to the platform, and a roof (8) connected to the walls. Reversible joint connectors (9, 10, 11, 12, 21, 22) are along the edges of the walls and on the opposed faces of the platform and the roof to removably join each wall to the walls adjacent thereto, the platform and the roof. A reversible lock (13, 14, 15) for the joint connectors are provided arranged between each wall and the adjacent walls and between each wall and the platform and the roof.

A system of structural interlocking panels for forming disaster-resistant buildings, comprising: a hollow, internally-braced, vacuum-insulated panel shell having at least two interlocking sides, the first side having a convex-inward single-curvature, the second side having a straight surface, the third side having a straight surface with at least one integral tongue with at least one head extending vertically-upward for receiving a complementary groove of a first side of an adjacent panel. Panels are thus vertically slide-locked along panel sides and faces, thereby triggering automatic snap joints that prevent backward movement of the panel. The system can assemble spheres, cylinders, toroids, tetrahedrons, flat shapes, and irregular shapes.