Patent ID: 7415906

Claim:
A device comprising: a set of opposite sliding members connected by a nut and threaded rod assembly, wherein the rotational motion of the threaded rod translates into a change in the relative position of said sliding members; said nut and threaded rod assembly comprising: a threaded rod connected to one of said sliding members, a housing connected to the other of said sliding members, and a pivotable nut connected to said housing, such that said nut pivoting plane being orthogonal to the longitudinal axial plane of said threaded rod; said nut having an internal thread and a contiguous round excision, resulting in the partial removal of the internal thread; said nut having the center point of the imaginary circle projected by the partial internal thread and the pivoting point in the same geometric plane; said nut having the diameter of said contiguous round excision larger than the diameter of said threaded rod, such that the pivoting motion of said nut disengaging the partial inner thread of said nut and the outer thread of said threaded rod, and enabling said sliding members of said device changing relative position without the rotational motion of said threaded rod; said nut having radial preload, said radial preload realized by means of connecting a compression spring member between said nut and said housing; said compression spring exerting a force on said nut, and said force on said nut being tangential to the arc described by the pivoting motion of said nut, and said radial preload engaging the threads of said nut and of said threaded rod with no mechanical play; and said nut connected to said housing with no axial mechanical play between said nut and said housing; and said axial mechanical play referenced to the longitudinal axis of said threaded rod.