Browse Prior Art Database

Diskette Pressure Pad Assembly

IP.com Disclosure Number: IPCOM000087617D
Original Publication Date: 1977-Feb-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 2 page(s) / 72K

Publishing Venue

IBM

Related People

Hanson, CA: AUTHOR [+2]

Abstract

Constant force spring 10 (Fig. 2) acting on pressure plate 12 applies only the force on diskette assembly 14 sufficient to ensure that assembly 14 is positioned against platen 16 so that undue wear of disk 18 (Fig. 1) within its surrounding jacket 20 does not take place.

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Diskette Pressure Pad Assembly

Constant force spring 10 (Fig. 2) acting on pressure plate 12 applies only the force on diskette assembly 14 sufficient to ensure that assembly 14 is positioned against platen 16 so that undue wear of disk 18 (Fig. 1) within its surrounding jacket 20 does not take place.

Diskette 14 is of the type disclosed in U.S Patent 3,668,658 and includes thin magnetic disk 18 rotatably disposed within surrounding jacket 20. While diskette assembly 14 is held in place against platen 16, suitable magnetic heads extend through radial slots 22 to magnetically read or write on the surfaces of disk 18.

Spring 10 (Fig. 3) is disposed between flanges 24 fixed on the surface of disk drive cover 26 which is swingable about a pivot 28 (Fig. 2). Spring 10 at its center 10a is fixed to cover 26 and is connected to plate 12 by a pair of hook-shaped terminal portions 10b (Fig. 4) extending through lug portions 12a formed on plate
12. Plate 12 has an extension 12b disposed between flanges 24 and is held in place by pin 30 extending through a slot 12c in extension 12b and through flanges 24.

Spring 10 is preferably of a close-wound compression type that exerts a near constant force when its ends are flexed back upon themselves toward the center portion of the spring. When cover 26 is swung about pivot 28 in direction A, plate 12 contacts diskette 14 and holds it on platen 16. The ends of spring 10 are flexed toward the center of the spring and toward the adjacent surface of cover 26.

Due to the constant force nature of spring 10, the increase in pressure provided by p...