In a mechanism for recycling energy from stairs (200), a step platform (210) is moveable between an upper and lower position. An energy storage device (220), coupled to the platform (210), stores energy when a downward force is applied thereto, causing the step platform (210) to move to the lower position. The energy storage device (220) also releases stored energy as the step platform (210) moves from to the upper position. A controllable locking mechanism (240) locks the step platform (210) in the lower position when the downward force has caused the step platform (210) to move into the lower position. A sensor (250) determines when a downward force has been applied to the next higher step platform (250). A controller (300) signals the controllable locking mechanism (242) to unlock the step platform (250) when the step platform (250) is in the lower position and when the downward force has been applied to the next higher step platform (250).

A stair box system made of a stair box core, stringers, risers and treads. The inner surfaces of the stringers have a discontinuous series of mortises positioned to engage only with the treads. Each tread is beveled from the front to back surfaces and each of the riser is beveled from the top to the bottom surface. Each tread features one or more notches cut into its back surface and each riser includes a complementary hook cut into its bottom surface. The hooks on the risers engage the notches on the treads forming an open-faced channel. Removable covers fit over the treads of the stair box core. These covers protect the stair box core and/or they feature decorative building materials like hardwood or tile. The system allows the user to upgrade their stairs by replacing the covers with covers featuring a different finished surface.

A stair box system made of a stair box core, stringers, risers and treads. The inner surfaces of the stringers have a discontinuous series of mortises positioned to engage only with the treads. Each tread is beveled from the front to back surfaces and each of the riser is beveled from the top to the bottom surface. Each tread features one or more notches cut into its back surface and each riser includes a complementary hook cut into its bottom surface. The hooks on the risers engage the notches on the treads forming an open-faced channel. Removable covers fit over the treads of the stair box core. These covers protect the stair box core and/or they feature decorative building materials like hardwood or tile. The system allows the user to upgrade their stairs by replacing the covers with covers featuring a different finished surface.

The present invention relates to an elastic foothold for stairs comprising: an upper plate, wherein one or more first coupling protrusions are formed on a side of a bottom surface, one or more first block insertion parts having second coupling protrusions are formed on the other side of the bottom surface, and a first anti-slip part is formed on a side of a top surface; a lower plate, wherein first coupling grooves corresponding to the first coupling protrusions are formed on a side of the bottom surface so as to be male/female-coupled to a side of the upper plate, and one or more second block insertion parts having third coupling protrusions are formed on the other side of the bottom surface; one or more first blocks that are inserted and coupled to the first block insertion parts, that have second coupling grooves formed on a bottom surface so as to be male/female-coupled to the second coupling protrusions, and that have third coupling grooves formed on a top surface; one or more second blocks that are inserted and coupled to the second block insertion parts, that have fourth coupling grooves formed on a bottom surface so as to be male/female-coupled to the third coupling protrusions, and that have fifth coupling grooves formed on a top surface; and one or more first elastic members, wherein both ends are respectively fixed to the fourth coupling grooves and the fifth coupling grooves between the first blocks and the second blocks. According to the present invention, an elastic foothold for stairs that can be fixed to stairs and that minimises shock applied to feet when climbing up and down the stairs so as to be able to prevent harmful effects on joints such as knees of a walker can be provided.

The present invention relates to an elastic foothold for stairs comprising: an upper plate, wherein one or more first coupling protrusions are formed on a side of a bottom surface, one or more first block insertion parts having second coupling protrusions are formed on the other side of the bottom surface, and a first anti-slip part is formed on a side of a top surface; a lower plate, wherein first coupling grooves corresponding to the first coupling protrusions are formed on a side of the bottom surface so as to be male/female-coupled to a side of the upper plate, and one or more second block insertion parts having third coupling protrusions are formed on the other side of the bottom surface; one or more first blocks that are inserted and coupled to the first block insertion parts, that have second coupling grooves formed on a bottom surface so as to be male/female-coupled to the second coupling protrusions, and that have third coupling grooves formed on a top surface; one or more second blocks that are inserted and coupled to the second block insertion parts, that have fourth coupling grooves formed on a bottom surface so as to be male/female-coupled to the third coupling protrusions, and that have fifth coupling grooves formed on a top surface; and one or more first elastic members, wherein both ends are respectively fixed to the fourth coupling grooves and the fifth coupling grooves between the first blocks and the second blocks. According to the present invention, an elastic foothold for stairs that can be fixed to stairs and that minimises shock applied to feet when climbing up and down the stairs so as to be able to prevent harmful effects on joints such as knees of a walker can be provided.

A returned stair tread assembly comprises a tread plate, a front nosing and a return nosing fitted flush against each other to form an exposed joint between the front and return nosings, and a device for securing the return nosing to the front nosing and the stair tread plate. The tread plate has a side tongue. The front nosing has a front nosing tongue spaced from a forward end of a side edge surface of the front nosing. The return nosing receiving the front nosing tongue of the front nosing and the side tongue of the stair tread plate therein. A front end of the side groove is spaced from a forward end of the return nosing. The front nosing tongue and the side tongue are disposed in the side groove and configured to slidably connect the stair tread plate and the return nosing.

A simplified staircase 1 includes a plurality of girders 3 that form a plurality of steps Each of the girders 3 includes one or more first protrusions 17 that protrude from a front side of an upper surface of each of the girders 3. Each of the girders 3 further includes one or more second protrusions 15 that protrude from a rear side of the upper surface of the girder 3. The one or more second protrusions 15 are higher than the one or more first protrusions 17 in height.

A stair. The stair tread comprises a composite material. The composite material is formed into a grid of ribs and a top side coupled to the grid of ribs. The top side comprises a gutter slope design comprising sloped grooves, where the depth of the grooves at a first end is deeper than the depth of the grooves at a second end, with a gradual slope from the first end to the second end.