Patent ID: 6311800
Filing Date: 2001-11-06
Classification: B66B,E04G,Y10T

Abstract:
A raising system for raising platforms comprising an upright stationary beam member, a series of equally spaced similar rack teeth secured to said beam member and laterally projecting from the same, each rack tooth having a substantially horizontal, straight top face, a tip and an under face, and a framework guided for vertical up and down movement along said beam member, a pinion device mounted on said framework and meshing with said rack teeth, said pinion including a power driven shaft rotatably supported by said framework, spaced from, normal to and extending across said beam member, a pair of spaced parallel radial supports secured to said power driven shaft and a series of parallel idle shafts extending between said supports, equally spaced from one another and equally radially spaced from said power driven shaft, and a cylindrical roller assembly rotatably mounted on each idle shaft, said cylindrical roller assemblies of equal diameter and of a length slightly less than the distance between said two supports, said roller assemblies freely rotatable on their respective idle shafts, clearing said under faces and bearing on and rolling over the top faces of said rack teeth upon said power driven shaft rotating in one direction to raise said framework along said upright beam member or in the other direction to lower said framework along said beam member, each of said roller assemblies includes several rollers disposed side by side.