Stabilized elevator filing device

Claim 1

In a vertically disposed filing apparatus comprising a cabinet having a front opening and wherein a plurality of trays disposed therein are adapted to be moved in an elliptical path and presented at said opening for access to said trays, and wherein said trays are each carried on pivot pins in joint pivotal engagement at their opposed sides with the ends of the suspension arms, said arms diverging therefrom and separately pivotally connected at their opposed ends to the links of a sprocket chain, said chain being carried about a vertically spaced pair of sprockets including means for driving said sprockets, elliptical stabilizer means for said trays comprising channel members at the opposed sides of said cabinet of an extent embracing said sprocket chains and defined by spaced vertical components and a pair of aligned medially spaced symmetrical arcuate components at the top and bottom of said vertical components and merging and communicating with each other and with said vertical components at the top and bottom thereof to form two closed elliptical paths of equal distance, one of the arcuate components at the top and bottom together with the vertical components forming one path and being deeper than the remaining arcuate components, and a triangular stabilizer arm pivoted at one corner to said tray pivot pins and carrying rollers at its two remaining corners disposed in said channel members, one of said rollers being longer than the other and adapted to project into said deeper arcuate components, with the shorter roller projecting into the shallower arcuate components.