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US3771797A Expired / Lapsed US ⏱️ 0.0 years remaining

Guide for phono-pick-up

Assignee: Individual
•
Filing: 1971-02-08
•
Granted: 1973-11-13
•
Expires: 1991-02-08
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Abstract

Abstract Phono-pick-up guide providing a longitudinal permanent-magnet guideway receiving a permanent-magnet guidepiece which carries the pick-up, with the guidepiece having in the guideway clearance throughout, and being by magnetic forces held hovering for movement and at rest therein without contact therewith.

Inventors

  • 👤 K Braun

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-04 01:13
CPC Classifications
F; F16; F16C; F16C39/00; F16C39/06; F16C39/063; F16C32/00; F16C32/04; F16C32/0406; F16C32/0408; F16C32/0423; F16C32/0434; G; G11; G11B; G11B3/00; G11B3/02; G11B3/08; G11B3/09; G11B3/092; G11B3/10; G11B3/12; G11B3/125; G11B3/34; G11B3/38

Claims Analysis

Total Claims: 2
Claim 1
Independent Claim 212 words
A guide for a phono-pick-up device having an arm carrying a needle and counterweight at opposite ends thereof, said arm being turnably supported about a pivot intermediate its ends, said guide comprising: an elongated rectilinear guidEway comprising magnetic circuit means terminating at oppositely facing pole pieces of opposing polarities: a magnetic guidepiece having a longitudinal axis and freely movable in the direction of its axis along said guideway, said guidepiece having oppositely facing pole pieces of opposite polarity, each pole piece of said guidepiece being spaced apart from, but configured to interlock with, an opposite polarity pole piece of said guideway, whereby there is only limited freedom of movement of said guidepiece, either laterally with respect to, or rotary about, its longitudinal axis; said magnetic circuit means and said magnetic guidepiece generating magnetic forces cooperating to hold said guidepiece anywhere in said guideway in a certain hovering disposition in which said guidepiece has lateral clearance from, and is completely out of contact with, said guideway; and, said guidepiece carrying said pivot on which said arm is turnably supported for permitting the needle on said arm to move in tracking relation with the spiral grooves in a record disc, with the needle being horizontally spaced from said guidepiece when tracking a record disc.
Claim 2
Dependent Claim 212 words
A guide for a phono-pick-up device having an arm carrying a needle and counterweight at opposite ends thereof, said arm being turnably supported about a pivot intermediate its ends, said guide comprising: an elongated rectilinear guidEway comprising magnetic circuit means terminating at oppositely facing pole pieces of opposing polarities: a magnetic guidepiece having a longitudinal axis and freely movable in the direction of its axis along said guideway, said guidepiece having oppositely facing pole pieces of opposite polarity, each pole piece of said guidepiece being spaced apart from, but configured to interlock with, an opposite polarity pole piece of said guideway, whereby there is only limited freedom of movement of said guidepiece, either laterally with respect to, or rotary about, its longitudinal axis; said magnetic circuit means and said magnetic guidepiece generating magnetic forces cooperating to hold said guidepiece anywhere in said guideway in a certain hovering disposition in which said guidepiece has lateral clearance from, and is completely out of contact with, said guideway; and, said guidepiece carrying said pivot on which said arm is turnably supported for permitting the needle on said arm to move in tracking relation with the spiral grooves in a record disc, with the needle being horizontally spaced from said guidepiece when tracking a record disc.

References Cited (Backward Citations)

US2413206A Cited
US3101952A Cited
US3356372A Cited
US3441331A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1976-11-12 1977-05-14 1977-11-13 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1980-11-12 1981-05-14 1981-11-13 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1984-11-12 1985-05-14 1985-11-13 $7700.00 Window Closed / Lapsed

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