Power driven rotary data storage and retrieval file

Claim 1

A power driven rotary data storage and retrieval file comprising a vertical stationary post, a collar fixed upon the post intermediately of the ends of the post, a wheel frame having a depending tubular hub slidably received upon an upper portion of the post and seated upon the collar in bearing relationship for rotation relative to the collar and the post, the collar serving to bear the load of the wheel frame, a motor driven sprocket wheel having a depending hub slidably received upon a lower portion of the post below the collar for rotation relative to the collar and the post, the hub of the wheel frame and the hub of the sprocket wheel being restrained against axial movement relative to the post, the hub of the wheel frame having an integral plate flange extending radially about its lower end, and a slip plate friction clutch drivingly engaging the sprocket wheel with the flange whereby rotation of the sprocket wheel about the post is translated into rotation of the wheel frame about the post, the clutch comprising an annular friction disc pad coaxial with the post seated upon an upper flat face of the sprocket wheel and having rotation relative to the post, an upper clutch pressure plate resting upon the disc pad in coaxial relation to the post and having rotation relative to the post, means fixed upon the pressure plate having an interlocking driving engagement with the flange of the hub of the wheel frame, and screw elements threaded in the flange extending axially through the flange into abutment with an upper surface of the pressure plate, the screw elements pressurizing the pressure plate against the disc pad and as a consequence pressurizing the disc pad against the face of the sprocket wheel so that rotation of the latter is transmitted through the clutch to the wheel frame.