US3844571A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sound pick-up device for playing back records of small diameters on electric gramophones or and other reproducing apparatus provided with automatic stop means
Assignee: MAV METHODES AUDIO VISUELLES
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Filing: 1972-12-20
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Granted: 1974-10-29
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Expires: 1992-12-20
Abstract
Abstract This invention relates to a pick-up device for playing back disk-shaped records of small diameter, e.g., 4 inches, on a conventional record-player which normally plays back records of larger diameter. A pulley fitted onto the shaft of the turn-table drives by means of a belt, an auxiliary turn-table of smaller diameter than the conventional record player turntable, the auxiliary turn-table being carried by a support arranged for maintaining the grooves of the small-diameter record within the normal range of operation of the pick-up arm.
Inventors
- 👤 A Mensier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 21:58
CPC Classifications
G; G11; G11B; G11B3/00; G11B3/60
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
191 words
In combination with a standard record player including a mounting plate through which extends An axle rotatable about a predetermined axis, a turn-table rotatably mounted on said axle, a pick-up arm adapted to sweep a sector of said turn-table and automatic stop means effective to terminate rotation of said axle when said pick-up is a predetermined distance from said axis, a device for playing back a phonograph record having a radius smaller than said predetermined distance and having an engraved surface, said device comprising an auxiliary turn-table and an auxiliary turn-table drive means rotatably driven by said axle to in turn drive said auxiliary turn-table, said auxiliary turntable being maintained above the first-named turn-table by a support in a radially off-set position with respect to said axle such that at least a part of the engraved surface of said phonograph record is located in the sector swept by said pick-up arm in normal operation and that said support is mounted on the axle of said first-named turn-table by said auxiliary turn-table drive means and is supported beyond the periphery of the firstnamed turn-table upon said mounting plate of said record player.
Claim 2
Dependent Claim
191 words
In combination with a standard record player including a mounting plate through which extends An axle rotatable about a predetermined axis, a turn-table rotatably mounted on said axle, a pick-up arm adapted to sweep a sector of said turn-table and automatic stop means effective to terminate rotation of said axle when said pick-up is a predetermined distance from said axis, a device for playing back a phonograph record having a radius smaller than said predetermined distance and having an engraved surface, said device comprising an auxiliary turn-table and an auxiliary turn-table drive means rotatably driven by said axle to in turn drive said auxiliary turn-table, said auxiliary turntable being maintained above the first-named turn-table by a support in a radially off-set position with respect to said axle such that at least a part of the engraved surface of said phonograph record is located in the sector swept by said pick-up arm in normal operation and that said support is mounted on the axle of said first-named turn-table by said auxiliary turn-table drive means and is supported beyond the periphery of the firstnamed turn-table upon said mounting plate of said record player.
Claim 3
Dependent Claim
59 words
A device according to claim 1, wherein said support exhibits the general shape of a plate comprising a bearing through which the shaft of said first-named turn-table freely extends and in which is journalled the hub of a pulley constituted by said auxiliary turn-table drive means secured onto the shaft, through which pulley said auxiliary turn-table is drivingly rotated.
Claim 4
Dependent Claim
20 words
A device according to claim 2, wherein said pulley drivingly rotates said auxiliary turn-table through the medium of a belt.
Claim 5
Dependent Claim
16 words
A device according to claim 3, wherein said pulley and said turn-table have the same diameter.
Claim 6
Dependent Claim
26 words
A device according to claim 3, wherein said support bears upon the mounting plate of said apparatus through the medium of a stand of adjustable height.
Claim 7
Dependent Claim
26 words
A device according to claim 2, wherein said support bears upon the mounting plate of said apparatus through the medium of a stand of adjustable height.
Claim 8
Dependent Claim
26 words
A device according to claim 2, wherein said support is provided with a cover covering at least said pulley and the free runs of said belt.
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) | 1977-10-28 | 1978-04-29 | 1978-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-28 | 1982-04-29 | 1982-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-28 | 1986-04-29 | 1986-10-29 | $7700.00 | Window Closed / Lapsed |