Rotatable base unit support for a file cabinet

Claim 2

A rotatable base unit for a file cabinet, comprising an upper base member having a top plate adapted to have a file cabinet mounted thereon, a spoked first ring element fixed to an underface of the top plate having a hub defining an axially depending pivot shaft, and a plate cover seated against the underside of the first ring element having at its center a pivot hole through which the pivot shaft depends; a lower base member adapted to have a stationary condition upon a floor surface, and having a table top plate and a second ring element fixed to an underface of the table top plate; a disk disposed parallel to and with clearance between the plate cover and the table top plate; a succession of closely spaced rollers mounted on stub axles projecting radially from the periphery of the disk, the rollers having their peripheries in rolling contact with the opposed plate cover and the table top plate; the first and second ring elements being of the same diameter and in parallel relationship; each ring element having a rim of a radial thickness corresponding to the width of the peripheries of the rollers and aligned with the said peripheries; the disk and the table top plate having center pivot holes through which the pivot shaft depends; and a washer element secured to the pivot shaft below the table top plate.

Claim 3

A base unit providing a rotatable support for a file cabinet, the unit comprising: a lower member having a table top plate, a bracing ring fixed in abutment with an underface of the table top plate, the bracing ring having leg sockets boss elements about its periphery, floor engageable leg bolts threadedly engaged in the leg sockets and depending therefrom, the leg bolts having screw driver slots in their upper ends accessible through openings in the table top plate for adjusting the leg bolts relative to the leg sockets so as to obtain a level condition of the lower member; an upper member having a sheet plate top upon which a file cabinet is adapted to be mounted, a strengthening ring fixed in abutment with an underface of the sheet plate top having spoked ribs fixed at their inner ends to an axially depending pivot shaft, and a sheet plate cover abutting undersurfaces of the strengthening ring and the spoked ribs, the sheet plate cover having an axial hole through which the pivot shaft depends; a floating disk disposed with clearance between and in parallel relation to the sheet plate cover and the table top plate, a succession of closely spaced rollers mounted about the periphery of the disk having rolling contact with the sheet plate cover and the table top plate, the rollers being mounted upon stub axles projecting radially from a peripheral flange of the disk, and the stub axles spacing the rollers radially from and in close proximity to the flange; the pivot shaft depending through axial holes in the disk and in the table top plate allowing rotation of the upper member over the rollers relative to the lower member; a plate washer fixed to a bottom end face of the pivot shaft and projecting radially below an undersurface of the table top plate; and the bracing and strengthening rings having peripheral rims of a radial width corresponding to the radial width of the peripheries of the rollers and aligned therewith.

Claim 4

A base unit providing a rotatable support for a file cabinet, the unit comprising: a lower member having a table top plate, a bracing ring fixed in abutment with an underface of the table top plate, the bracing ring having leg sockets boss elements about its periphery, floor engageable leg bolts threadedly engaged in the leg sockets and depending therefrom, the leg bolts having screw driver slots in their upper ends accessible through openings in the table top plate for adjusting the leg bolts relative to the leg sockets so as to obtain a level condition of the lower member; an upper member having a sheet plate top upon which a file cabinet is adapted to be mounted, a strengthening ring fixed in abutment with an underface of the sheet plate top having spoked ribs fixed at their inner ends to an axially depending pivot shaft, and a sheet plate cover abutting undersurfaces of the strengthening ring and the spoked ribs, the sheet plate cover having an axial hole through which the pivot shaft depends; a floating disk disposed with clearance between and in parallel relation to the sheet plate cover and the table top plate, a succession of closely spaced rollers mounted about the periphery of the disk having rolling contact with the sheet plate cover and the table top plate, the rollers being mounted upon stub axles projecting radially from a peripheral flange of the disk, and the stub axles spacing the rollers radially from and in close proximity to the flange; the pivot shaft depending through axial holes in the disk and in the table top plate allowing rotation of the upper member over the rollers relative to the lower member; a plate washer fixed to a bottom end face of the pivot shaft and projecting radially below an undersurface of the table top plate; and the bracing and strengthening rings having peripheral rims of a radial width corresponding to the radial width of the peripheries of the rollers and aligned therewith.