US3741567A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for centering disc records on the turntable of a record player
Assignee: Individual
•
Filing: 1971-10-27
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Granted: 1973-06-26
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Expires: 1991-10-27
Abstract
Abstract A device for centering disc records on a record player having a centering and ejection element which accommodates records having larger center holes and is displaceable over the central spindle which accommodates records with small center holes. The centering element is arranged to be recessed in the turntable against the force of a spring. Projections are provided for locking the centering element in the recessed position. The centering element can be unlocked by exerting pressure on it, with the result that the centering element is clamped around a ring movable over the spindle and is resiliently widened, so that during its return it is capable of passing over a collar on the central spindle, and the ring is arrested by this collar.
Inventors
- 👤 T Bis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:48
CPC Classifications
G; G11; G11B; G11B17/00; G11B17/02; G11B17/022; G11B17/028; G11B17/0281
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
246 words
A device for centering disc records on the turntable of a record player comprising a central spindle secured in said turntable having first, second and third cylindrical portions, the diameter of said first and second portions being smaller than the diameter of said third portion, a boundary separating said first cylindrical portion from said second cylindrical portion, a cylindrical centering element having a radially resilient sleeve portion and arranged for axial displacement along said central spindle between a raised, a recessed, and a depressed position, a recess within said turntable for receiving said centering element when in the recessed and depressed positions, spring means acting on said centering element for urging said centering element toward said raised position, radially projecting locking members internally carried by said sleeve portion of said centering element for cooperation with said boundary between said first and second cylindrical portions of said central spindle so as to lock said centering element in its recessed position, a disconnect ring movable over said first cylindrical portion having an outer diameter at least equal to the largest diameter of said boundary, gripping means arranged on the lower part of said sleeve for gripping said disconnect ring when a force is applied to said centering element to move it to said depressed position and for carrying said ring toward said raised position of said centering element when said force is removed until said ring abuts said boundary thereby unlocking said centering element from the recessed position.
Claim 2
Independent Claim
246 words
A device for centering disc records on the turntable of a record player comprising a central spindle secured in said turntable having first, second and third cylindrical portions, the diameter of said first and second portions being smaller than the diameter of said third portion, a boundary separating said first cylindrical portion from said second cylindrical portion, a cylindrical centering element having a radially resilient sleeve portion and arranged for axial displacement along said central spindle between a raised, a recessed, and a depressed position, a recess within said turntable for receiving said centering element when in the recessed and depressed positions, spring means acting on said centering element for urging said centering element toward said raised position, radially projecting locking members internally carried by said sleeve portion of said centering element for cooperation with said boundary between said first and second cylindrical portions of said central spindle so as to lock said centering element in its recessed position, a disconnect ring movable over said first cylindrical portion having an outer diameter at least equal to the largest diameter of said boundary, gripping means arranged on the lower part of said sleeve for gripping said disconnect ring when a force is applied to said centering element to move it to said depressed position and for carrying said ring toward said raised position of said centering element when said force is removed until said ring abuts said boundary thereby unlocking said centering element from the recessed position.
Claim 3
Dependent Claim
59 words
The device according to claim 1 wherein said first cylindrical portion of said central spindle has a smaller diameter than the second cylindrical portion of said central spindle, said second cylindrical portion being axially located in between said first and third cylindrical portion, and wherein said boundary between said first and second cylindrical portions comprises a shoulder shaped junction.
Claim 4
Dependent Claim
93 words
The device according to claim 1 wherein said first and second cylindrical portions of said central spindle have equal diameters, said second cylindrical portion being axially located in between said first and third cylindrical portions of said central spindle, and wherein said boundary between said first and second cylindrical portions comprises an annular collar, the surface of said collar adjacent said first cylindrical portion lying in a plane at right angles to said first cylindrical portion, and the surface of said collar adjacent said second cylindrical portion forming part of a conical surface.
Claim 5
Dependent Claim
32 words
The device according to claim 1 wherein said gripping means comprises a tapered bore formed in the part of said sleeve of said centering element arranged for cooperation with said disconnect ring.
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) | 1976-06-25 | 1976-12-25 | 1977-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-25 | 1980-12-25 | 1981-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-25 | 1984-12-25 | 1985-06-26 | $7700.00 | Window Closed / Lapsed |