A folding pet staircase consists of frames and treads, wherein, the frame comprises a starting edge, a tread edge and side edges, two sides of the starting edge are connected with the side edges, two sides of the tread edge are connected with the side edges, a tread beam is arranged between the starting edge and the tread edge, baffle fixing plates are embedded in the starting edge, the tread edge and the side edges, and the tread is placed on the tread beam. The fixing plates are fixed to the specific positions by the flexible fabric frames. When the user wants to fold the pet staircase, he/she can fold the pet staircase directly along the crease lines of the fixing plates into a flat sheet structure, thus facilitating storage. The pet staircase can be used for the storage of small pet products such as toys, comb, snacks, etc.

A staircase assembly is installed in a multi-story building, including first and second flights of stairs that are hingably coupled to a landing, and a plurality of vertically-oriented columns coupled to the landing. The staircase assembly is assembled into a first liftable floor plate, and is disposed in a folded arrangement when the liftable floor plate is positioned at an assembly level elevation. The staircase assembly is disposed in an unfolded arrangement when the first liftable floor plate is positioned at a first design level elevation and a second liftable floor plate that is positioned at a second design level elevation below the first liftable floor plate.

A box structure building partition constructed out of box designed to be installed in a building partition, articulated relative to box closing hatch, wherein the box structure features a closing hatch locking mechanism in the box and closing hatch features bracket in closing hatch socket for unlocking the locking mechanism, wherein bracket assumes two extreme positions in closing hatch, so that bracket in the first extreme position is retracted into closing hatch and the locking mechanism is locked and in the second extreme position bracket is slid out from closing hatch and the locking mechanism is unlocked and the bracket features a coupling for coupling element, accessible for a user when bracket is not in its first extreme position.

A folding pet staircase consists of frames and treads, wherein, the frame comprises a starting edge, a tread edge and side edges, two sides of the starting edge are connected with the side edges, two sides of the tread edge are connected with the side edges, a tread beam is arranged between the starting edge and the tread edge, baffle fixing plates are embedded in the starting edge, the tread edge and the side edges, and the tread is placed on the tread beam. The fixing plates are fixed to the specific positions by the flexible fabric frames. When the user wants to fold the pet staircase, he/she can fold the pet staircase directly along the crease lines of the fixing plates into a flat sheet structure, thus facilitating storage. The pet staircase can be used for the storage of small pet products such as toys, comb, snacks, etc.

A linkage assembly in accordance with the invention which includes a plurality of elongate linkage members 12, a first, second and third connecting means for connecting and allowing pivotal displacement between proximal end regions of a first 14 and second 16 linkage members, a step support connecting means for connecting and allowing pivotal displacement between the first 14 and fourth 18 linkage members, inwardly the second connecting means and for supporting a stepping formation 20 thereon.

An improved retractable attic stair apparatus assembly includes a stair component retractable staircase assembly including two shock mount subassemblies, two gas spring subassemblies, and two short railing pipe assemblies. The two short railing pipe assemblies are used as a left and right handrail of the retractable staircase assembly while also supporting the two shock mount subassemblies. The two gas spring subassemblies are at least partially supported by the two shock mount subassemblies. The attic stair apparatus is configured for an installation site in an attic or a garage and includes a first retracted configuration. A deployed configuration allows the apparatus to extend downwardly from the installation site for use of the attic stair apparatus by a user to ascend the attic stair apparatus to access an attic, a garage crawl space, or a garage roof.

An improved retractable attic stair apparatus assembly includes a stair component retractable staircase assembly including two shock mount subassemblies, two gas spring subassemblies, and two short railing pipe assemblies. The two short railing pipe assemblies are used as a left and right handrail of the retractable staircase assembly while also supporting the two shock mount subassemblies. The two gas spring subassemblies are at least partially supported by the two shock mount subassemblies. The attic stair apparatus is configured for an installation site in an attic or a garage and includes a first retracted configuration. A deployed configuration allows the apparatus to extend downwardly from the installation site for use of the attic stair apparatus by a user to ascend the attic stair apparatus to access an attic, a garage crawl space, or a garage roof.

The subject-matter of the invention comprises a hoist mechanism for attic scissor stairs, attic stairs and method of hoisting attic stairs concertina ladder using hoist mechanism, wherein the hoist mechanism with an electric drive is constructed out of load bearing frame (5), half-frame (62) with electric drive (72) suspended from it, and half-frame (61) is constructed out of lateral stile (61) and two side stiles (62), so that half-frame side stiles (62) are mounted using articulated joints to load bearing frame (5) wherein each side stile (62) features lifting system (13) for lifting attic stairs concertina ladder (3), wherein lifting system (13) assumes a passive and an active position during hoist mechanism operation.

An improved retractable attic stair apparatus assembly includes a stair component retractable staircase assembly including two shock mount subassemblies, two gas spring subassemblies, and two short railing pipe assemblies. The two short railing pipe assemblies are used as a left and right handrail of the retractable staircase assembly while also supporting the two shock mount subassemblies. The two gas spring subassemblies are at least partially supported by the two shock mount subassemblies. The attic stair apparatus is configured for an installation site in an attic or a garage and includes a first retracted configuration. A deployed configuration allows the apparatus to extend downwardly from the installation site for use of the attic stair apparatus by a user to ascend the attic stair apparatus to access an attic, a garage crawl space, or a garage roof.

The subject-matter of the invention comprises a box enclosure hoist assembly, built out of spring (41), one end of which is designed to be connected to box enclosure fixed structural element (1) and the other end is connected with the hoist assembly hoist supports (42, 43) unit and there are at least two spring (41) end attachment positions (51, 52) on one of the supports (42) and that between attachment positions (51, 52) there is continuous traverse path (421) to guide spring (41) end from one attachment position (51) to another attachment position (52), as well as a method for changing spring end attachment position in the hoist assembly.