Patent US5059761A successfully refreshed from Google Patents.
Patent US3524662A successfully refreshed from Google Patents.
US4479157A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mounting for a head drum of a helical scan recorder
Assignee: US Philips Corp
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Filing: 1982-06-18
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Granted: 1984-10-23
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Expires: 2002-06-18
Abstract
Abstract A symmetrical mounting arrangement for a detachable head drum of a helical scan tape recorder in which a deformable sleeve extends from the drum along the drive spindle with a small clearance, and a clamping ring surrounding the sleeve exerts pressure uniformly to clamp the spindle and accurately center the drum on the spindle.
Inventors
- 👤 Petrus J. J. Aarts
- 👤 Harald Fleck
- 👤 Karl Kocsisek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:14
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/48; G11B5/52; Y; Y10; Y10T; Y10T403/00; Y10T403/70; Y10T403/7062; Y10T403/7064; Y10T403/7066; Y10T403/7067; Y10T403/7069
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
176 words
A helical scan tape recorder/reproducer comprising an at least partly cylindrical drive spindle having a free end, rotatable about an axis of rotation; at least one magnetic head; a head support to which the magnetic head is secured, having a central bore for passage of the drive spindle therethrough with limited clearance, and means for detachably mounting the head support on the drive spindle near said free end, said means for detachably mounting comprising a circular symmetrical clamping sleeve formed as a unitary part with and extending axially from the head support and having a free end, said sleeve having an elastically deformable wall portion concentric with said axis of rotation, and having an outer surface; and clamping ring means for deforming said sleeve to eliminate clearance between the drive spindle and the clamping sleeve, characterized in that the clamping ring is a circular symmetrical unitary element deformed to be in tension, thereby exerting clamping pressure substantially uniformly over the circumference of said outer surface so as to cause symmetrical radial deformation of said clamping sleeve.
Claim 2
Dependent Claim
176 words
A helical scan tape recorder/reproducer comprising an at least partly cylindrical drive spindle having a free end, rotatable about an axis of rotation; at least one magnetic head; a head support to which the magnetic head is secured, having a central bore for passage of the drive spindle therethrough with limited clearance, and means for detachably mounting the head support on the drive spindle near said free end, said means for detachably mounting comprising a circular symmetrical clamping sleeve formed as a unitary part with and extending axially from the head support and having a free end, said sleeve having an elastically deformable wall portion concentric with said axis of rotation, and having an outer surface; and clamping ring means for deforming said sleeve to eliminate clearance between the drive spindle and the clamping sleeve, characterized in that the clamping ring is a circular symmetrical unitary element deformed to be in tension, thereby exerting clamping pressure substantially uniformly over the circumference of said outer surface so as to cause symmetrical radial deformation of said clamping sleeve.
Claim 3
Dependent Claim
52 words
A recorder/reproducer as claimed in claim 1, characterized in that said clamping sleeve outer surface is a cylindrical surface terminating in a shoulder and that said clamping ring has a conical inner surface engaging said outer surface at the shoulder so as to deform the clamping sleeve at an accurately defined location.
Claim 4
Dependent Claim
39 words
A recorder/reproducer as claimed in claim 2, characterized in that said support comprises means for taking up reaction forces exerted by auxiliary tools used for moving said clamping ring with uniform axial motion to tighten or release said ring.
Claim 5
Dependent Claim
42 words
A recorder/reproducer as claimed in claim 3, characterized in that said means for taking up forces include a tubular extension of the support having an internal screw thread concentric with said clamping sleeve, and an external screw thread on said clamping ring.
Claim 6
Dependent Claim
276 words
A helical scan tape recorder/reproducer comprising an at least partly cylindrical drive spindle having a free end, rotatable about an axis of rotation; at least one magnetic head; a head support to which the magnetic head is secured, having a central bore for passage of the drive spindle therethrough with limited clearance, and means for detachably mounting the head support on the drive spindle near said free end, said means for detachably mounting comprising a circular symmetrical clamping sleeve formed as a unitary part with and extending axially from the head support and having a free end, said sleeve having an elastically deformable wall portion concentric with said axis of rotation, and having an outer surface; and clamping ring means for deforming said sleeve to eliminate clearance between the drive spindle and the clamping sleeve, characterized in that the clamping ring consists of a circular symmetrical mass of a material which is radially deformable as a result of axial compression, and that said means for detachably mounting further includes a pressure sleeve arranged concentrically around the clamping sleeve so as to define an annular space therebetween, said head support having a circular symmetrical clamping ring stop surface at an end of said outer surface remote from said free end for defining an end of said annular space, and a circular symmetrical axially movable clamping ring compressor for defining the other end of said annular space, and displacement means for moving said clamping ring compressor toward the clamping ring stop surface so as to compress the clamping ring axially and uniformly, whereby said clamping ring is deformed radially inwardly and exerts clamping pressure on the clamping sleeve.
Claim 7
Dependent Claim
276 words
A helical scan tape recorder/reproducer comprising an at least partly cylindrical drive spindle having a free end, rotatable about an axis of rotation; at least one magnetic head; a head support to which the magnetic head is secured, having a central bore for passage of the drive spindle therethrough with limited clearance, and means for detachably mounting the head support on the drive spindle near said free end, said means for detachably mounting comprising a circular symmetrical clamping sleeve formed as a unitary part with and extending axially from the head support and having a free end, said sleeve having an elastically deformable wall portion concentric with said axis of rotation, and having an outer surface; and clamping ring means for deforming said sleeve to eliminate clearance between the drive spindle and the clamping sleeve, characterized in that the clamping ring consists of a circular symmetrical mass of a material which is radially deformable as a result of axial compression, and that said means for detachably mounting further includes a pressure sleeve arranged concentrically around the clamping sleeve so as to define an annular space therebetween, said head support having a circular symmetrical clamping ring stop surface at an end of said outer surface remote from said free end for defining an end of said annular space, and a circular symmetrical axially movable clamping ring compressor for defining the other end of said annular space, and displacement means for moving said clamping ring compressor toward the clamping ring stop surface so as to compress the clamping ring axially and uniformly, whereby said clamping ring is deformed radially inwardly and exerts clamping pressure on the clamping sleeve.
Claim 8
Dependent Claim
56 words
A recorder/reproducer as claimed in claim 5, characterized in that said displacement means includes a tubular extension of said head support having an internal thread, and a coupling nut disposed coaxially around the clamping sleeve and engaging said internal thread, arranged to abut said clamping ring compressor and displace said compressor axially upon turning the nut.
Claim 9
Independent Claim
114 words
A device for mounting a drum on a spindle having an axis and a cylindrical surface concentric about said axis, comprising a circular symmetrical deformable cylindrical clamping sleeve formed as a unitary part with and extending axially from the drum and having an outer surface terminating at a shoulder, and a circular symmetrical clamping ring which is a unitary element having a conical inner surface, deformed elastically to be in tension, arranged symmetrically around said clamping sleeve with the conical surface engaging said shoulder, thereby exerting clamping pressure substantially uniformly over the circumference of said clamping sleeve at an accurately defined location, to deform and clamp the clamping sleeve against the spindle cylindrical surface.
Claim 10
Independent Claim
114 words
A device for mounting a drum on a spindle having an axis and a cylindrical surface concentric about said axis, comprising a circular symmetrical deformable cylindrical clamping sleeve formed as a unitary part with and extending axially from the drum and having an outer surface terminating at a shoulder, and a circular symmetrical clamping ring which is a unitary element having a conical inner surface, deformed elastically to be in tension, arranged symmetrically around said clamping sleeve with the conical surface engaging said shoulder, thereby exerting clamping pressure substantially uniformly over the circumference of said clamping sleeve at an accurately defined location, to deform and clamp the clamping sleeve against the spindle cylindrical surface.
Claim 11
Dependent Claim
51 words
A device as claimed in claim 7, further comprising means for taking up reaction forces exerted by auxiliary tools used for moving said clamping ring axially and uniformly to tighten or release the ring, whereby unbalanced forces on the spindle are eliminated when mounting or detaching the drum from the spindle.
Claim 12
Dependent Claim
21 words
A device as claimed in claim 8, wherein said means comprise a tubular extension of said drum having an internal thread.
Claim 13
Independent Claim
196 words
A device for detachably mounting a drum on a spindle having an axis and a cylindrical outer surface concentric about said axis, comprising a circular symmetrical cylindrical clamping sleeve formed as a unitary part with and extending axially from the drum and having an outer surface extending from a stop shoulder toward a free end of the clamping sleeve; a pressure sleeve arranged concentrically about the clamping sleeve, and an axially movable clamping ring compressor arranged concentrically with said clamping sleeve between the stop shoulder and the free end of the sleeve, said outer surface, pressure sleeve, stop shoulder and ring compressor defining an annular space therebetween; a clamping ring consisting of a circular symmetrical mass of a material which is radially deformable as a result of axial compression, disposed in said annular space; and displacement means for uniformly axially moving the clamping ring compressor toward the stop shoulder so as to elastically and symmetrically deform the clamping ring by compressing it axially, whereby said clamping ring deforms radially inwardly and exerts a uniformly distributed clamping pressure over the outer surface of the clamping sleeve, deforming the clamping sleeve symmetrically and clamping it to the spindle.
Claim 14
Independent Claim
196 words
A device for detachably mounting a drum on a spindle having an axis and a cylindrical outer surface concentric about said axis, comprising a circular symmetrical cylindrical clamping sleeve formed as a unitary part with and extending axially from the drum and having an outer surface extending from a stop shoulder toward a free end of the clamping sleeve; a pressure sleeve arranged concentrically about the clamping sleeve, and an axially movable clamping ring compressor arranged concentrically with said clamping sleeve between the stop shoulder and the free end of the sleeve, said outer surface, pressure sleeve, stop shoulder and ring compressor defining an annular space therebetween; a clamping ring consisting of a circular symmetrical mass of a material which is radially deformable as a result of axial compression, disposed in said annular space; and displacement means for uniformly axially moving the clamping ring compressor toward the stop shoulder so as to elastically and symmetrically deform the clamping ring by compressing it axially, whereby said clamping ring deforms radially inwardly and exerts a uniformly distributed clamping pressure over the outer surface of the clamping sleeve, deforming the clamping sleeve symmetrically and clamping it to the spindle.
Claim 15
Dependent Claim
57 words
A device as claimed in claim 10, characterized in that said displacement means includes a tubular extension of said head support having an internal thread, and a coupling nut disposed coaxially around the clamping sleeve and engaging said internal thread, arranged to abut said clamping ring compressor and to displace said compressor axially upon turning the nut.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-10-23 | 1988-04-23 | 1988-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-10-23 | 1992-04-23 | 1992-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-10-23 | 1996-04-23 | 1996-10-23 | $7700.00 | Window Closed / Lapsed |