US4430678A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drive apparatus for recording disks in which the disk is clamped between a driven recessed member and a rotatably mounted clamping member
Assignee: BASF SE
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Filing: 1981-05-01
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Granted: 1984-02-07
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Expires: 2001-05-01
Abstract
Abstract A drive apparatus for a recording disk, particularly a flexible magnetic disk in an envelope, comprising a rotatable clamping member which can be caused to engage one another, after the recording disk has been introduced therebetween, to clamp the disk for rotation thereof, in position between clamping surfaces of the two members. The clamping member is of axially expandable design and a resilient element is interposed between the face of the clamping member and the bottom of the recessed member so that the clamping member, prior to completion of its stroke and prior to its radial expansion, is engaged by the spring element. In this manner the spring element centers the position of the clamping member with respect to the recessed member and thereby insures clamping of the disk in its centered position.
Inventors
- 👤 Joachim Hack
- 👤 Roland Brotzler
- 👤 Klaus Schulze-Berge
- 👤 Rudolf Angermann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:03
CPC Classifications
G; G11; G11B; G11B17/00; G11B17/02; G11B17/022; G11B17/028; G11B17/03
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
179 words
A driving apparatus for a recording disk having a central aperture, particularly a flexible magnetic disk in an envelope, comprising: a driven recessed member; a rotatably mounted clamping member of the type expanding radially in response to the exertion of an axial force thereon; each said member having a clamping surface; means for moving the clamping member toward the recessed member to clamp, at the end of the clamping stroke, the disk upon the introduction of its central aperture between said clamping surfaces; and spring means being interposed between the leading planar surface of said clamping member and the inner bottom of said recessed member such that, prior to the completion of the clamping stroke, by means of said spring means, said clamping member is axially compressed and thus radially expanded against said central aperture to displace said disk toward a centered position and is yieldably coupled to said recessed member to enable said clamping member to be rotatably taken along by said recessed member if said recessed member is rotated prior to the completion of said clamping stroke.
Claim 2
Dependent Claim
179 words
A driving apparatus for a recording disk having a central aperture, particularly a flexible magnetic disk in an envelope, comprising: a driven recessed member; a rotatably mounted clamping member of the type expanding radially in response to the exertion of an axial force thereon; each said member having a clamping surface; means for moving the clamping member toward the recessed member to clamp, at the end of the clamping stroke, the disk upon the introduction of its central aperture between said clamping surfaces; and spring means being interposed between the leading planar surface of said clamping member and the inner bottom of said recessed member such that, prior to the completion of the clamping stroke, by means of said spring means, said clamping member is axially compressed and thus radially expanded against said central aperture to displace said disk toward a centered position and is yieldably coupled to said recessed member to enable said clamping member to be rotatably taken along by said recessed member if said recessed member is rotated prior to the completion of said clamping stroke.
Claim 3
Dependent Claim
20 words
A driving apparatus as claimed in claim 1, wherein the spring means is a metal spring, preferably a leaf spring.
Claim 4
Dependent Claim
25 words
A driving apparatus as claimed in claim 1 or 2, wherein the spring means is made from a resilient plastics material, particularly a foam plastic.
Claim 5
Dependent Claim
27 words
A driving apparatus as claimed in claim 1, wherein the spring means is arranged eccentrically with respect to axis of rotation of the clamping and recessed members.
Claim 6
Dependent Claim
30 words
A driving apparatus as claimed in claim 1, 2 or 4, wherein the spring rate of the spring means is from 0.2 N/mm to 1.0 N/mm, preferably about 0.4 N/mm.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-02-06 | 1987-08-08 | 1988-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-02-06 | 1991-08-08 | 1992-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-02-06 | 1995-08-08 | 1996-02-07 | $7700.00 | Window Closed / Lapsed |