Importance

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Abstract

A disc mounting and centering device, for use in a disc file employing removable, flexible rotary discs comprises guides 52 for locating a disc 40 such that a central and circular locating hole 48 in the disc 40 is approximately parallel planar and coaxial with a circular recess 12 of substantially the same diameter as the hole 48, set in the flat top of a rotating cylindrical spindle 10, a frusto conical expandable shell 20 for insertion through the hole 48 into the recess 12 having a largest, unexpanded diameter less than that of the hole 48, a lip 22 at the largest diameter end of the shell 20, of greater diameter than the hole for engaging the disc 40 with the spindle 10 as the shell 20 enters the recess, and a frusto conical expander 30 for insertion into the shell 20 firstly to expand the shell 20 until it is constrained by the recess 12 and secondly, by applying axial force in excess of that required to expand the shell 20 for pressing the lip 22 against the spindle 10, with said excess force to clamp the disc 40.

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First Claim