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Spherical Collet Cone for Diskette Drive Spindle

IP.com Disclosure Number: IPCOM000050535D
Original Publication Date: 1982-Nov-01
Included in the Prior Art Database: 2005-Feb-10
Document File: 2 page(s) / 50K

Publishing Venue

IBM

Related People

Haroldsen, CG: AUTHOR [+2]

Abstract

The collet-cone inside a collet is used to expand the collet segments to clamp a disk to a drive spindle. It is normally conical in shape, as shown in Fig. 1. Such a shape can result in points of contact with the collet that will cause some of the segmented fingers in the collet to tip upwards away from the top surface of the drive spindle. This loosens their grip on the disk being driven. Shown in Fig. 2, a spherical collet-cone insures that the force applied to the collet segments is above the top inside corner of the drive spindle. This insures that the collet segments have a force component clamping the disk to the top of the drive spindle.

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Spherical Collet Cone for Diskette Drive Spindle

The collet-cone inside a collet is used to expand the collet segments to clamp a disk to a drive spindle. It is normally conical in shape, as shown in Fig.
1. Such a shape can result in points of contact with the collet that will cause some of the segmented fingers in the collet to tip upwards away from the top surface of the drive spindle. This loosens their grip on the disk being driven. Shown in Fig. 2, a spherical collet-cone insures that the force applied to the collet segments is above the top inside corner of the drive spindle. This insures that the collet segments have a force component clamping the disk to the top of the drive spindle.

In Fig. 1, a conical collet-cone 10 tipped slightly off axis causes a segment 12 of the collet to tip up away from the top surface of drive spindle 14. The force applied from the cone 10 to the collet is normal to the surface of the collet at the point of contact with the cone. When the point of contact is above the inside top corner of the drive spindle, then the collet segment has a component of force downward onto the disk 16, holding the disk on top of the drive spindle. If the point of contact is below the top inside corner of the drive spindle, then the segment 12 can tip upward away from the disk 16 and the top surface of the drive spindle 14.

In Fig. 2, the spherical collet-cone 17, even if tipped off center axis, always provides a contact point above the inside top...