Patent US3675932A successfully refreshed from Google Patents.
US3675932A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical lowering and lifting mechanism for phonograph tone arms
Assignee: Individual
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Filing: 1970-03-16
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Granted: 1972-07-11
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Expires: 1990-03-16
Abstract
Abstract A unidirectional electric motor is used to lift and lower a phonograph arm by means of an eccentric or a cam mounted on a suitable gear train. The eccentric can stop in one of two positions corresponding to the upper and lower positions of the arm. This stopping is controlled by a switch controlled by the same shaft on which the eccentric is mounted. The switch that opens the circuit of the motor can be over-ridden either by the automatic trip switch of the arm or by a manual pushbutton. Thus, the initiation of the arm lift cycle can be achieved either automatically or manually while the lowering cycle can be initiated manually.
Inventors
- 👤 Jacob Rabinow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:49
CPC Classifications
G; G11; G11B; G11B3/00; G11B3/02; G11B3/10; G11B3/34; G11B3/36
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
230 words
A. In combination with a phonograph tone arm mounted on a carriage and having drive means for translatory movement of the carriage to transport the tone arm across a record disc being played and including sensing means controlling said drive means to maintain said tone arm tangent to the record groove as the record is played, b. a tone arm lifting lever mounted on said carriage and normally disengaged from said tone arm, c. electric motor means mounted on said carriage to move said lever into engagement with said tone arm to lift same off the disc record being played, d. first switch means responsive only to an abnormally large and rapid lateral excursion of the tone arm, such as caused by the run-off groove of a record being played, to initiate actuation of said electric motor means, e. holding switch means in parallel with said first switch means and normally open in the record playing position of the tone arm, f. holding switch actuating means driven by said drive means concurrently with said lifting lever to close said holding switch means once said lifting lever has started to lift the tone arm, to continue actuation of said drive means after its initiation by said first switch means, said last actuating means including further means for opening said holding means when the tone arm is in the fully raised position.
Claim 2
Dependent Claim
230 words
A. In combination with a phonograph tone arm mounted on a carriage and having drive means for translatory movement of the carriage to transport the tone arm across a record disc being played and including sensing means controlling said drive means to maintain said tone arm tangent to the record groove as the record is played, b. a tone arm lifting lever mounted on said carriage and normally disengaged from said tone arm, c. electric motor means mounted on said carriage to move said lever into engagement with said tone arm to lift same off the disc record being played, d. first switch means responsive only to an abnormally large and rapid lateral excursion of the tone arm, such as caused by the run-off groove of a record being played, to initiate actuation of said electric motor means, e. holding switch means in parallel with said first switch means and normally open in the record playing position of the tone arm, f. holding switch actuating means driven by said drive means concurrently with said lifting lever to close said holding switch means once said lifting lever has started to lift the tone arm, to continue actuation of said drive means after its initiation by said first switch means, said last actuating means including further means for opening said holding means when the tone arm is in the fully raised position.
Claim 3
Dependent Claim
33 words
The invention according to claim 1, and tone arm positioning means actuated by said lifting lever to restore the tone arm from its large lateral excursion back into its normal record playing orientation.
Claim 4
Dependent Claim
118 words
The invention according to claim 1, h. said lifting means being effective on further rotation of the electric motor means in the same direction to lower said tone arm into record playing position, i. manual switch means in parallel with said first and said holding switch means to initiate said further rotation of the electric drive means, j. further holding switch actuating means driven by said drive means, once said lifting means has started to drive said lever to lower the tone arm, to continue actuation of said drive means until the tone arm is in fully lowered position again, in which position the tone arm lifting lever is disengaged and the holding switch means is again open.
Claim 5
Dependent Claim
28 words
The invention according to claim 1, said lifting means being driven by said motor means through a shaft, said holding switch actuating means being on said same shaft.
Claim 6
Dependent Claim
55 words
The invention according to claim 1, said lifting lever being pivoted intermediate its ends, one end of said lever being bifurcated so as to terminate in two tines, the lifting means being an eccentric lying between said tines so that as the eccentric rotates, the other end of the lever is alternately raised and lowered.
Claim 7
Dependent Claim
56 words
The invention according to claim 5, said tone arm having a projection lying in the path of said other end of the lever and positioned to be disengaged therefrom in the lower position of the lever but engaged therewith in the raised position of the lever to raise the tone arm from the disc playing surface.
Claim 8
Dependent Claim
41 words
The invention according to claim 6, said projection having a notched cam surface therein, said lever engaging said notched surface so as to align the tone arm laterally from its position of large lateral excurions back into normal lateral playing alignment.
References Cited (Backward Citations)
US2915315A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-11 | 1976-01-10 | 1976-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-11 | 1980-01-10 | 1980-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-11 | 1984-01-10 | 1984-07-11 | $7700.00 | Window Closed / Lapsed |