Disc file hub mounting means

Claim 2

In a magnetic disc storage unit, a hub assembly for supporting a plurality of magnetic discs each having a central circular opening, said hub assembly comprising: a cylindrical hub having a circumferential outer surface; first and second raised land areas formed on said hub outer surface displaced equidistantly in opposite directions from a vertical plane through the axis of said hub, said land areas each having surfaces spaced from the axis of said hub by a radial distance equal to the radius of said disc central openings; means supporting said hub for rotation about a horizontally oriented axis; and means for selectively locking said hub into a position at which said first and second land areas lie above a horizontal plane through said hub axis and are respectively displaced by the same angle in opposite directions from said vertical plane through said hub axis.

Claim 3

The assembly of claim 1 wherein said hub has a free end thus permitting said discs to be slid onto said hub along the axis thereof, said discs being free to bear downwardly against said hub land areas to thus locate said disc areas coincident with said hub axis; a plurality of spacer collars each adapted to be fitted around said hub between adjacent discs; and an end plate adapted to be secured to said hub free end for bearing against said discs and collars in the direction of said hub axis.

Claim 4

The assembly of claim 1 further including a third raised land area on said hub outer surface displaced between said first and second raised area, said third land area having its surface spaced from the axis of said hub by a radial distance which is less than the radius of said disc central openings.

Claim 5

A hub assembly useful in a magnetic disc storage unit for precisely locating discs relative to a hub and for allowing easy installation on and removal of the discs from said hub, said assembly comprising: a cylindrical hub having an outer surface relieved along a substantial portion of the circumference thereof to define first and second land areas displaced by 120* around said circumference, each of said land areas defining a reference surface spaced by a radial distance from the axis of said hub equal to the radius of a central disc opening; means supporting said hub with its axis oriented horizontally and for rotation thereabout; means for locking said hub in a locked position whereat said first and second land areas are disposed above a horizontal plane through said hub axis and displaced equally by 60* in opposite directions from a vertical plane through said hub axis; a plurality of discs each having a central opening having a radius equal to said radial distance between said hub axis and said reference surfaces, said discs adapted to be threaded on said hub while in said locked position so as to be free to bear downwardly equally against said reference surfaces to thus locate said disc axes coincident with said hub axis; and means for locking said discs to said hub while said hub is in said locked position.

Claim 6

A hub assembly useful in a magnetic disc storage unit for precisely locating discs relative to a hub and for allowing easy installation on and removal of the discs from said hub, said assembly comprising: a cylindrical hub having an outer surface relieved along a substantial portion of the circumference thereof to define first and second land areas displaced by 120* around said circumference, each of said land areas defining a reference surface spaced by a radial distance from the axis of said hub equal to the radius of a central disc opening; means supporting said hub with its axis oriented horizontally and for rotation thereabout; means for locking said hub in a locked position whereat said first and second land areas are disposed above a horizontal plane through said hub axis and displaced equally by 60* in opposite directions from a vertical plane through said hub axis; a plurality of discs each having a central opening having a radius equal to said radial distance between said hub axis and said reference surfaces, said discs adapted to be threaded on said hub while in said locked position so as to be free to bear downwardly equally against said reference surfaces to thus locate said disc axes coincident with said hub axis; and means for locking said discs to said hub while said hub is in said locked position.

Claim 7

The hub assembly of claim 4 wherein a third raised area is formed on the outer surface of said hub, displaced by 120* from each of said first and second land areas, said third area having a surface spaced from said hub axis by a radial distance less than said radial distance between said hub axis and said reference surfaces.

Claim 8

The assembly of claim 4 including a cavity centrally defined in said hub; and a drivE spindle projecting into said cavity and fixedly secured to said hub therein.