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Patent EP0010605A1 successfully refreshed from Google Patents.
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EP0010605A1 Expired / Lapsed EP ⏱️ 0.0 years remaining

Magnetic disk drive apparatus

Assignee: International Business Machines Corp
•
Filing: 1979-09-19
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Granted: —
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Expires: 1999-09-19
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Abstract

Abstract Apparatus for loading a collet (456) with respect to a rotatable drive hub (430) of a magnetic disk drive apparatus to grip a magnetic disk between the collet and drive hub, includes a leaf spring (460) supported at opposite ends with respect to a machine frame (422) and carrying the collet (456) at an intermediate place between the ends. One end of the spring (460) is pivotally mounted on a boss (462) on the frame and the other end has a sliding connection in a slot (468) in a web (466) of the frame. A manually rotatable shaft (470) has an offset portion (469) carrying a roller (472) to apply force on the leaf spring between its pivotal mounting and the collet so as to move the collet to engage the disk between the collet and drive hub against the resilience of the leaf spring. The leaf spring is relatively wide in its portion (461) between its pivotal mounting and the collet and is relatively narrow between the collet and its other end so that the narrow portion (463) of the spring bends the wide portion (461) of the spring as the collet is moved towards the hub. The collet thereby grips the disk uniformly with respect to the hub and the longitudinal centre of the collet remains nearly coincident with the longitudinal centre of the hub as the collet completes its disk engaging movement with respect to the hub to avoid side thrust on the disk.

Inventors

  • 👤 John Arthur Carlson
  • 👤 Kenneth David Rusch
  • 👤 David Lester Sippel

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-10-28 17:33
CPC Classifications
G; G11; G11B; G11B17/00; G11B17/02; G11B17/04; G11B17/041

Claims Analysis

Total Claims: 9
Claim 1
Independent Claim 79 words
Magnetic disk drive apparatus comprising a rotatable drive hub and a collet movable towards the hub to grip a disk about a central hole between the collet and the hub, characterised by a leaf spring supported adjacent its ends and carrying the collet between its ends, and means for applying a force on the spring between its ends to bend the spring longitudinally and move the collet towards the hub to engage a disk between the collet and hub.
Claim 2
Dependent Claim 79 words
Magnetic disk drive apparatus comprising a rotatable drive hub and a collet movable towards the hub to grip a disk about a central hole between the collet and the hub, characterised by a leaf spring supported adjacent its ends and carrying the collet between its ends, and means for applying a force on the spring between its ends to bend the spring longitudinally and move the collet towards the hub to engage a disk between the collet and hub.
Claim 3
Dependent Claim 31 words
Apparatus according to claim 1, in which the force applying means is effective on the leaf spring between one of its ends and the place at which the collet is carried.
Claim 4
Dependent Claim 25 words
Apparatus according to claim 2, in which the force applying means includes a rotatable member having an eccentrically located part for engagement with the spring.
Claim 5
Dependent Claim 59 words
Apparatus according to claim 3, in which the spring includes a depressed portion in which the eccentric part rests when the collet is in an initial disengaged position and having a projection over which the eccentric part travels during rotation of the rotatable member to act as a detent with respect to the spring in the collet engaged position.
Claim 6
Dependent Claim 27 words
Apparatus according to any preceding claim, in which the leaf spring is pivotally mounted at one end and has a sliding connection mounting at the other end.
Claim 7
Dependent Claim 36 words
Apparatus according to claim 5, in which the portion of the spring between the pivotal mounting and the collet carrying place is stiffer than the portion between the sliding connection mounting and the collet carrying place.
Claim 8
Dependent Claim 26 words
Apparatus according to any preceding claim, in which the leaf spring is bowed in a direction away from the drive hub in the collet disengaged position.
Claim 9
Dependent Claim 40 words
Apparatus according to claim 7, in which the force applying means spring holds the spring with a bow less than the bow of the spring in a free condition, the spring being held against fixed stops adjacent the two ends.

References Cited (Backward Citations)

US3815150A Cited
US3890643A Cited
US4089029A Cited
DE2709261A1 Cited

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