An extendable arm structure includes: an upper extendable arm and a lower extendable arm which extend parallel in a same direction; and a vertical coupling member that couples the upper and lower extendable arms. Each of the extendable arms includes a plurality of X-shaped cross units each formed by pivotally coupling two rigid members via a middle coupling shaft, and two end coupling shafts that pivotally couple ends of adjacent ones of the cross units. The extendable arm structure further includes: a planar member that closes, in a planar fashion, a space between the rigid member of the upper extendable arm and the rigid member of the lower extendable arm which extends parallel to the rigid member of the upper extendable arm in a same direction.

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.

A containment airlock, in particular an airlock for intervention on a site likely to be contaminated with radiation, asbestos and biological and/or chemical agents. The containment airlock comprises a self-supporting frame and a flexible containment shell. The shell is configured to be assembled with the frame. The frame is articulated so as to be extensible between a folded storage position and an extended intervention position. The frame comprises articulated reinforcement rods. The articulated reinforcement rods comprise rigid segments and at least one intermediate articulation connecting the segments.

One or more embodiments of the present disclosure provide a jointed member. The jointed member may include a first elongate section having a surface defining a first oblong opening, a second elongate section having a surface defining a second oblong opening, and a fastener passing through the first oblong opening and the second opening to connect the first elongate section and the second elongate section, where the first oblong opening and the second oblong opening move relative each other and the fastener as the jointed member transitions from a first predetermined state towards a second predetermined state.

A lattice structure comprising a series of connecting rings or half-rings on which a series of orienting elements are secured. The orienting elements being equipped with holes and a slot in which the connecting rings or half-rings are disposed, as well as comprising profiles that are solidly connected using joining elements that extend through holes in the profiles.

A modular structure may comprise multiple mechanical linkages. The structure may undergo two-dimensional or three-dimensional shape transformations, such as bending, twisting, shearing, uniform scaling, and anisotropic scaling. These shape transformations may be actuated by applying force to one or more specific locations in the structure. Each of the linkages in the modular structure may comprise a four-bar linkage. The exact shape transformation that the structure undergoes may be determined by the type and location of the linkages in the structure.

One or more embodiments of a jointed member are provided. The jointed member may include a first elongate section having a surface defining a first oblong opening, a second elongate section having a surface defining a second oblong opening, and a fastener passing through the first oblong opening and the second opening to connect the first elongate section and the second elongate section, where the first oblong opening and the second oblong opening move relative each other and the fastener as the jointed member transitions from a first predetermined state towards a second predetermined state.

A collapsible structural frame for forming a soffit having a multi-planar surface. The collapsible structural frame includes a first frame portion configured to receive a first sheet of building material, a second frame portion configured to receive a second sheet of building material, the second frame portion extending along a second reference plane, and a third frame portion configured to receive a third sheet of building material. The collapsible structural frame is alterable from: (1) a flat state in which the first, second, and third frame portions extend along the second reference plane in a linear arrangement; and (2) a deployed state in which the first frame portion is out of plane with the second reference plane and the third frame portion is out of plane with the second reference plane;

A mechanically foldable frame can be used in a steel structure framing process. Since the framing process costs a lot of time in the house building process, a foldable steel structure can realize fast framing. The foldable frame structure includes beams and columns can be folded into flat frames for transportation. The foldable frame structure can save on-site operation time by replacing the framing process with factory-made mechanical equipment.

A frame structure using a tube subjected to bending processing by a pushing bending apparatus is provided to solve the problem of a simple body constituting the small-sized interior space. The frame structure forms a plane of frames by bundling a plurality of tubes or bars, each of which is bent to form a waveform of a constant amplitude around a linear axis in a same plane, to contact maximum amplitude portions of the tubes or bars each other, each maximum amplitude portion being in the same position in the longitudinal direction.