US3577023A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Moving coil actuator
Assignee: MEGAVAULT
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Filing: 1969-12-04
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Granted: 1971-05-04
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Expires: 1989-12-04
Abstract
Abstract A moving-coil actuator having a carriage with an upright supporting post and an elongated undercarriage extending in one direction along a track for supporting the carriage. An electrical coil mounted on one side of the post projects in the same direction as the undercarriage into an annular air gap in a permanent magnet assembly, the undercarriage projecting into the assembly through a slot therein, and a plurality of headsupporting arms project in the opposite direction from the post into a stack of memory discs. Roller bearings adjacent the opposite ends of the undercarriage ride on inclined ways on the track, and a holddown bearing assembly is spring urged upwardly to ride along overlying ways. One element of an optical positiondetermining device is rigidly mounted on the undercarriage to coact with fixed elements on the actuator to determine the position of the carriage.
Inventors
- 👤 Lewis W Bleiman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:46
CPC Classifications
H; H02; H02K; H02K41/00; H02K41/02; H02K41/035; H02K41/0352; H02K41/0354; H02K41/0356; G; G05; G05D; G05D3/00; G05D3/12; G11; G11B; G11B5/00; G11B5/48; G11B5/54; G11B5/55; G11B5/5521
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
201 words
A moving-coil actuator having, in combination: a base having an elongated horizontal track thereon; an L-shaped carriage having an upright supporting post and a horizontal undercarriage extending along and overlying said track; first and second bearing assemblies mounted on said undercarriage adjacent the opposite ends thereof and spaced on opposite sides of the center of gravity of the carriage and the elements thereon; a third bearing assembly mounted on said undercarriage between said first and second assemblies, said third assembly being spring urged upwardly; ways on said base extending along said track above said third bearing assembly and Cooperating therewith to hold said first and second assemblies in firm engagement with said track; an elongated electrical coil spaced above said undercarriage and secured at one end to said post and at the other end to the end portion of said undercarriage remote from said post; a magnet assembly mounted on said base and having an annular air gap in which said coil extends, said magnet assembly also having a slot beneath said air gap receiving said undercarriage with a clearance fit; and a plurality of head-supporting arms secured to said post and projecting away therefrom a direction opposite to said undercarriage.
Claim 2
Dependent Claim
201 words
A moving-coil actuator having, in combination: a base having an elongated horizontal track thereon; an L-shaped carriage having an upright supporting post and a horizontal undercarriage extending along and overlying said track; first and second bearing assemblies mounted on said undercarriage adjacent the opposite ends thereof and spaced on opposite sides of the center of gravity of the carriage and the elements thereon; a third bearing assembly mounted on said undercarriage between said first and second assemblies, said third assembly being spring urged upwardly; ways on said base extending along said track above said third bearing assembly and Cooperating therewith to hold said first and second assemblies in firm engagement with said track; an elongated electrical coil spaced above said undercarriage and secured at one end to said post and at the other end to the end portion of said undercarriage remote from said post; a magnet assembly mounted on said base and having an annular air gap in which said coil extends, said magnet assembly also having a slot beneath said air gap receiving said undercarriage with a clearance fit; and a plurality of head-supporting arms secured to said post and projecting away therefrom a direction opposite to said undercarriage.
Claim 3
Dependent Claim
47 words
A moving-coil actuator as defined in claim 1 in which said track has oppositely inclined side surfaces forming inclined ways for said first and second bearing assemblies, the latter including rollers that are inclined to ride on said inclined ways to resist lateral deflection of said carriage.
Claim 4
Dependent Claim
47 words
A moving-coil actuator as defined in claim 1 further including a guide bar secured to the top of said post and projecting in the same direction as said arms; and guide means preventing lateral deflection of said guide bar during movement of said carriage along said track.
Claim 5
Dependent Claim
41 words
A moving-coil actuator as defined in claim 1 further including a first elongated position-determining element rigidly mounted on said undercarriage for movement therewith, and a second position-determining element mounted on said base alongside the path of movement of said first element.
Claim 6
Dependent Claim
113 words
A moving-coil actuator comprising: a base having an elongated track thereon; a magnet assembly on said base overlying a portion of said track and having an annular air gap in one of its ends, said magnet assembly also having a slot in said one end extending into said slot from the side of the assembly adjacent said track; an elongated electrical coil extending into said magnet assembly through said gap, parallel to said track; a carriage connected to said coil and having an elongated undercarriage extending along said track and into said magnet assembly through said slot; and means on said undercarriage supporting said carriage for back and forth movement along said track.
Claim 7
Dependent Claim
113 words
A moving-coil actuator comprising: a base having an elongated track thereon; a magnet assembly on said base overlying a portion of said track and having an annular air gap in one of its ends, said magnet assembly also having a slot in said one end extending into said slot from the side of the assembly adjacent said track; an elongated electrical coil extending into said magnet assembly through said gap, parallel to said track; a carriage connected to said coil and having an elongated undercarriage extending along said track and into said magnet assembly through said slot; and means on said undercarriage supporting said carriage for back and forth movement along said track.
Claim 8
Dependent Claim
38 words
A moving-coil actuator as defined in claim 5 wherein said supporting means include first and second bearing assemblies adjacent the opposite ends of said undercarriage and spaced on opposite sides of the center of gravity of the carriage.
Claim 9
Dependent Claim
26 words
A moving-coil actuator as defined in claim 6 further including yieldable means between said bearing assemblies for holding the latter resiliently in engagement with said track.
Claim 10
Dependent Claim
46 words
A moving-coil actuator as defined in claim 7 wherein said yieldable means is a third bearing assembly on said undercarriage yieldably urged away from said track, and ways on said base overlying said third bearing assembly to cooperate therewith in urging said undercarriage toward said track.
Claim 11
Dependent Claim
33 words
A moving-coil actuator as defined in claim 6 wherein said track is formed with oppositely inclined longitudinal ways, and each of said bearing assemblies has two inclined rollers riding on said inclined ways.
Claim 12
Dependent Claim
44 words
A moving-coil actuator as defined in claim 5 wherein said carriage is an L-shaped bar forming an upright post to which said coil is connected, and a horizontal portion forming said undercarriage and connected to the end of said coil remote from said post.
Claim 13
Dependent Claim
44 words
A moving-coil actuator as defined in claim 10 in which said supporting means include two bearing assemblies spaced apart and mounted on said undercarriage adjacent the opposite ends thereof, and further including means between said bearing assemblies yieldably holding the latter against said track.
Claim 14
Dependent Claim
49 words
A moving-coil actuator as defined in claim 10 further including an elongated guide bar projecting outwardly from said post, parallel to said track, in the direction opposite from said undercarriage, and means on said base guiding said bar against lateral deflection during movement of said carriage along said track.
Claim 15
Dependent Claim
84 words
A reciprocating actuator having, in combination: a base with an elongated horizontal track thereon; a carriage having an upright support and an elongated horizontal undercarriage connected to the lower end of said support and extending along said track; a driving member connected to said support above said undercarriage and acting on the support to move said carriage back and forth along said track; and main bearings on said undercarriage adjacent the opposite ends thereof engaging said track to support said carriage for movement thereon.
Claim 16
Dependent Claim
84 words
A reciprocating actuator having, in combination: a base with an elongated horizontal track thereon; a carriage having an upright support and an elongated horizontal undercarriage connected to the lower end of said support and extending along said track; a driving member connected to said support above said undercarriage and acting on the support to move said carriage back and forth along said track; and main bearings on said undercarriage adjacent the opposite ends thereof engaging said track to support said carriage for movement thereon.
Claim 17
Dependent Claim
50 words
A reciprocating actuator as defined in claim 13 further including holddown bearings yieldably mounted on said undercarriage between said opposite ends and resiliently urged upwardly, and ways on said base extending along said track above said holddown bearings to coact therewith in maintaining said main bearings firmly against said track.
Claim 18
Dependent Claim
59 words
A reciprocating actuator as defined in claim 13 in which said driving member is an electrical coil, and further including a magnet assembly having an annular air gap in one side receiving said coil, and a slot in said one side extending from adjacent said track to said gap, said undercarriage extending into said magnet assembly through said slot.
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) | 1974-05-03 | 1974-11-02 | 1975-05-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-03 | 1978-11-02 | 1979-05-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-03 | 1982-11-02 | 1983-05-04 | $7700.00 | Window Closed / Lapsed |