Rotational device

Abstract

A rotational device which finds application as a kinetic sculpture, a record stabilizer, an air agitator or an impeller comprises a helical curved member having a first elongate helical portion defining a first helix of first radius about a first axis and a second elongate helical portion of opposing handedness defining a second helix of a second radius, smaller than the first radius, about a second axis, and a proximal intermediate portion linking a first or lower end of the first helical portion and a proximal first or lower end of the second helical portion, wherein the second helical portion defines an internal cylindrical volume that is unoccupied and absent any central shafts or struts, a rotational support base or apparatus for facilitating rotation of the helical curved member and a mounting arrangement for mounting the helical curved member to the rotational support base or apparatus.

Dependencies are inferred from the claim text.