| 摘要 |
Spiral stair, consisting of a plurality of identical steps (1, 8), each step having a tread (step flat) (2) and a core (3) which is pierced along its axis by a through-hole (4) and intended to allow the positioning and attachment of the said steps, characterised in that: - each of the upper and lower faces of the core (3) includes a central recess (5) in the form of a disc, coaxial with the through-hole (4) which it has, this being intended to interact with a washer (25) for clamping and for adjusting the height of each step; - and in that the attachment of a step to the lower step is ensured by a hollow screw (10, 11) including a head (16, 17), a body (12, 13) of diameter less than that of the hole (4) of the core (3), and a tip (point) (14). <IMAGE> |
