US3717855A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic head unit
Assignee: US Philips Corp
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Filing: 1971-09-13
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Granted: 1973-02-20
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Expires: 1991-09-13
Abstract
Abstract A magnetic head unit for use in a data processing apparatus employing magnetizable recording discs, which unit comprises a plate-shaped support and a flat box which is made of sheet material and is secured to the support and defines a chamber which may be connected to a source of a pressurized fluid and has two openings which are closed by diaphragms. When pressure is set up in the chamber, one of the diaphragms moves a magnetic head, which is secured in a shoe and is resiliently connected to the support, in a direction towards the recording disc, while by means of the other diaphragm a brush pivotally supported on the support is lifted from the recording disc against a spring force under the influence of the fluid pressure.
Inventors
- 👤 Acker P Van
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 00:57
CPC Classifications
G; G11; G11B; G11B23/00; G11B23/50; G11B23/505; G11B5/00; G11B5/48; G11B5/54
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
196 words
A magnetic head unit for use in an apparatus for processing data in the form of magnetic recordings on disc-shaped recording surfaces, which magnetic head unit associated with a recording surface comprises a support, a magnetic head secured in a shoe, and resilient means by which the shoe is connected to the support, the support including a chamber which is adapted to be connected to a source of a pressurized fluid and is provided with an opening which is closed by a diaphragm by means of which the shoe together with the magnetic head is movable in a direction towards the recording surface under the influence of the pressure of the fluid, wherein there is mounted on the support a brush member which is movable towards the recording surface under the influence of a biasing member interposed between said support and the brush member, and movable in the opposite direction, against the biasing influence, under the influence of the pressure of the fluid, whereby the brush member is removed from the recording surface when the magnetic head moves toward said recording surface, and engages said recording surface when said magnetic head is in a retracted position.
Claim 2
Dependent Claim
196 words
A magnetic head unit for use in an apparatus for processing data in the form of magnetic recordings on disc-shaped recording surfaces, which magnetic head unit associated with a recording surface comprises a support, a magnetic head secured in a shoe, and resilient means by which the shoe is connected to the support, the support including a chamber which is adapted to be connected to a source of a pressurized fluid and is provided with an opening which is closed by a diaphragm by means of which the shoe together with the magnetic head is movable in a direction towards the recording surface under the influence of the pressure of the fluid, wherein there is mounted on the support a brush member which is movable towards the recording surface under the influence of a biasing member interposed between said support and the brush member, and movable in the opposite direction, against the biasing influence, under the influence of the pressure of the fluid, whereby the brush member is removed from the recording surface when the magnetic head moves toward said recording surface, and engages said recording surface when said magnetic head is in a retracted position.
Claim 3
Dependent Claim
196 words
A magnetic head unit for use in an apparatus for processing data in the form of magnetic recordings on disc-shaped recording surfaces, which magnetic head unit associated with a recording surface comprises a support, a magnetic head secured in a shoe, and resilient means by which the shoe is connected to the support, the support including a chamber which is adapted to be connected to a source of a pressurized fluid and is provided with an opening which is closed by a diaphragm by means of which the shoe together with the magnetic head is movable in a direction towards the recording surface under the influence of the pressure of the fluid, wherein there is mounted on the support a brush member which is movable towards the recording surface under the influence of a biasing member interposed between said support and the brush member, and movable in the opposite direction, against the biasing influence, under the influence of the pressure of the fluid, whereby the brush member is removed from the recording surface when the magnetic head moves toward said recording surface, and engages said recording surface when said magnetic head is in a retracted position.
Claim 4
Dependent Claim
196 words
A magnetic head unit for use in an apparatus for processing data in the form of magnetic recordings on disc-shaped recording surfaces, which magnetic head unit associated with a recording surface comprises a support, a magnetic head secured in a shoe, and resilient means by which the shoe is connected to the support, the support including a chamber which is adapted to be connected to a source of a pressurized fluid and is provided with an opening which is closed by a diaphragm by means of which the shoe together with the magnetic head is movable in a direction towards the recording surface under the influence of the pressure of the fluid, wherein there is mounted on the support a brush member which is movable towards the recording surface under the influence of a biasing member interposed between said support and the brush member, and movable in the opposite direction, against the biasing influence, under the influence of the pressure of the fluid, whereby the brush member is removed from the recording surface when the magnetic head moves toward said recording surface, and engages said recording surface when said magnetic head is in a retracted position.
Claim 5
Dependent Claim
44 words
A magnetic head unit as claimed in claim 1, wherein the chamber has a second opening which is closed by a diaphragm, the brush member being movable in the said opposite direction by means of this diaphragm under the influence of the fluid pressure.
Claim 6
Dependent Claim
136 words
A magnetic head unit as claimed in claim 2, wherein the support is a substantially flat rectangular base plate and the chamber is constituted by a box which is made of a sheet material and is secured to the base plate, the brush member having a stem which between its ends in a plane substantially at right angles to the base plate is pivotally supported in a bearing provided on the base plate aside the box and which at one end is provided with brush hairs and at the opposite end is adapted to be loaded by the fluid pressure by means of the diaphragm disposed in the second opening, whilst between the base plate and the brush stem there is arranged a spring which counteracts a force exerted by the pressurized fluid on the stem.
Claim 7
Dependent Claim
147 words
A magnetic head unit as claimed in claim 1, wherein the resilient means by which the shoe is connected to the support comprise an elongate supporting plate, which is connected to the support by means of two Z-shaped resilient elements located one behind the other in the direction of length of the supporting plate, and is adapted to be displaced in a direction parallel to itself in directions according to the longitudinal axis and a leaf-spring one end of which is secured to an end of the supporting plate and on the other end of which the shoe together with the magnetic head is mounted, the longitudinal axes of the supporting plate and of the leaf spring, which are situated in substantially parallel planes, crossing each other at right angles, and means which enable the position of the supporting plate relative to the support to be adjusted.
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) | 1976-02-20 | 1976-08-21 | 1977-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-20 | 1980-08-21 | 1981-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-20 | 1984-08-21 | 1985-02-20 | $7700.00 | Window Closed / Lapsed |