US3779563A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for counteracting inside force of pickup arm of record player
Assignee: Individual
•
Filing: 1972-05-24
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Granted: 1973-12-18
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Expires: 1992-05-24
Abstract
Abstract The device comprises a pair of ring-shaped magnets each of which is magnetized on one side only so that the N and S poles are formed in diametrically opposed relation on the magnetized side. The ring-shaped magnets are mounted on a pickup arm supporting shaft in such a manner that their magnetized faces are opposed to each other, with one of the magnets being arranged slidable on the shaft to enable to adjust the distance between the two opposed magnets and the other magnet being arranged rotatable at its fixed position on the supporting shaft along with the pickup, arm so that the pickup arm operates in a manner such that it is given an attractive or repulsive force of the magnets in a direction opposite to the inside force such that the curve of variation of the turning force caused by displacement of the magnetic poles will substantially coincide with the inside force variation curve.
Inventors
- 👤 K Irisawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:09
CPC Classifications
G; G11; G11B; G11B3/00; G11B3/02; G11B3/10; G11B3/12; G11B3/125; G11B3/127
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
139 words
A device for counteracting the inside force produced on a pickup arm, secured to a vertically oriented rotatable turning and supporting shaft, during playback of a record, comprising, in combination, a pair of ring-shaped magnets embracing said shaft in axially opposed relation, each of the opposing faces of said magnets being polarized with N and S poles; one magnet being fixed against movement axially of said shaft while being angularly displaceable with said shaft and said pickup arm, and the other magnet being fixed against angular adjustment while being adjustable axially of said shaft; means operable to angularly adjust said one magnet relative to said shaft in the horizontal direction; and means operable to adjust said other magnet axially of said shaft toward and away from said one magnet to adjust the axial distance between said opposed magnet faces.
Claim 2
Independent Claim
139 words
A device for counteracting the inside force produced on a pickup arm, secured to a vertically oriented rotatable turning and supporting shaft, during playback of a record, comprising, in combination, a pair of ring-shaped magnets embracing said shaft in axially opposed relation, each of the opposing faces of said magnets being polarized with N and S poles; one magnet being fixed against movement axially of said shaft while being angularly displaceable with said shaft and said pickup arm, and the other magnet being fixed against angular adjustment while being adjustable axially of said shaft; means operable to angularly adjust said one magnet relative to said shaft in the horizontal direction; and means operable to adjust said other magnet axially of said shaft toward and away from said one magnet to adjust the axial distance between said opposed magnet faces.
Claim 3
Dependent Claim
37 words
A device for counteracting the inside force produced on a pickup arm, as claimed in claim 1, in which said N and S poles are diametrically opposite each other on the respective faces of the associated magnets.
Claim 4
Dependent Claim
47 words
A device for counteracting the inside force produced on a pickup arm, as claimed in claim 1, in which the upper magnet is rotatable with said shaft and angularly adjustable relative thereto, and the lower magnet is fixed against rotation but is adjustable axially of said shaft.
Claim 5
Dependent Claim
74 words
A device for counteracting the inside force produced on a pickup arm, as claimed in claim 1, including a cover member having a rim and housing the upper magnet with its polarized face exposed downwardly; a screw extending through the rim of said cover member and engaged with said upper magnet, said screw projecting externally of said rim and having a grip head for angular adjustment of said upper magnet relative to said shaft.
Claim 6
Dependent Claim
85 words
A device for counteracting the inside force produced on a pickup arm, as claimed in claim 4, including an externally threaded cylinder fixedly housing the lower magnet with its polarized face exposed upwardly; an internally threaded rotatable cylinder threadedly engaged with said externally threaded cylinder; means restraining rotation of said externally threaded cylinder; and means inhibiting axial movement of said internally threaded cylinder; whereby, upon rotation of said internally threaded cylinder, said externally threaded cylinder and said lower magnet are adjusted axially of said shaft.
Claim 7
Dependent Claim
56 words
A device for counteracting the inside force produced on a pickup arm, as claimed in claim 5, including a tubular shaft surrounding said turning and supporting shaft and fixed against rotation; said tubular shaft having an axial groove in its external surface receiving a radially inwardly extending protuberance on the inner periphery of said lower magnet.
Claim 8
Dependent Claim
35 words
A device for counteracting the inside force produced on a pickup arm, as claimed in claim 6, including a block supporting said pickup arm; said cover member being mounted in said block for angular adjustment.
Claim 9
Dependent Claim
45 words
A device for counteracting the inside force produced on a pickup arm, as claimed in claim 7, including a spring embracing said turning and supporting shaft and engaged between an upper wall of said cover member and a flange on said turning and supporting shaft.
Claim 10
Dependent Claim
60 words
A device for counteracting the inside force produced on a pickup arm, as claimed in claim 5, in which said internally threaded rotatable cylinder has a plurality of axially extending circumferentially spaced indentations on its outer periphery, and a circumferentially extending groove on its external periphery; and a fixed supporting plate having an arcuate edge portion engaged in said groove.
References Cited (Backward Citations)
US3292935A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-17 | 1977-06-18 | 1977-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-17 | 1981-06-18 | 1981-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-17 | 1985-06-18 | 1985-12-18 | $7700.00 | Window Closed / Lapsed |