Patent ID: 6918190

Claim:
A mechanism for simultaneous angle adjustment of support elements relating to stair steps, said mechanism being part of a mold structure for a straight staircase and comprising a casing in which at least two interdependent shafts are arranged, each extending into the next of said interdependent shafts in a nested configuration where the successive intervals between the interdependent shafts are adjustable, and wherein each of said interdependent shafts has a threaded portion traversing an internally threaded block that is located in the casing and holds one of the support elements, said mechanism further comprising a rotatable shaft running parallel to said at least two interdependent shafts, said rotatable shaft passing through the blocks and being equipped with eccentrics, each of said eccentrics being respectively associated with one of the blocks, said eccentrics being constrained to share a rotation of said rotatable shaft, wherein the eccentric of each block interacts with the support element that is associated with said block, so that by pushing against the support element, the eccentric sets the support element to a predetermined slope angle (A).