US3709505A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sound reproducing apparatus
Assignee: TROSSINGER METALLSTIMMENFAB
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Filing: 1970-02-04
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Granted: 1973-01-09
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Expires: 1990-02-04
Abstract
Abstract A toy phonograph wherein mechanical vibrations of the tone arm in response to tracking by its stylus of a sound groove in a rotating record are transmitted to the loudspeaker diaphragm by means of a two-armed follower which is pivotably mounted on the tone arm and has a shorter arm engaging a contact plate on the central portion of the diaphragm and a longer arm which is biased by a spring to maintain the shorter arm in engagement with the contact plate. The ratio of the pressure with which the stylus engages the record to the pressure between the shorter arm and the contact plate is about three to one and the ratio of the lengths of the two follower arms approximates the ratio of the force with which the stylus bears against the record to the average force with which the spring acts on the longer arm. The point of engagement between the shorter arm and the contact plate of the diaphragm is in line with the axis of the stylus.
Inventors
- 👤 A Ashmele
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 01:47
CPC Classifications
G; G11; G11B; G11B33/00; G11B33/02; G11B33/06
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
243 words
In a sound producing apparatus, particularly for use with toys, a combination comprising a support; a record rotatably mounted on said support and having at least one sound groove of varying depth; motor means for rotating said record; a tone arm movably mounted at one end on said support means, said tone arm having a stylus on the other end arranged to track said sound groove and to vibrate said tone arm when said motor rotates said record, and a rigid projection projecting upwardly from said tone arm between the ends thereof and adjacent said other end thereof; a loud speaker mounted on said support; and means for transmitting vibrations from said tone arm to said loud speaker and comprising a rigid elongated follower supported between its ends on said projection for pivoting about a pivot axis and having a first short arm between one of its ends and said pivot axis and a second substantially longer arm between said pivot axis and the other end thereof, and biasing means between said other end of said follower and said tone arm for biasing said one end of said follower into engagement with said loud speaker whereby said follower will transmit to said loud speaker substantially only those vibrations which are due to movement of said stylus in response to changes in the depth of the tracked sound groove while transmission of slow vibrations due to wobbling of the record will be substantially prevented.
Claim 2
Dependent Claim
243 words
In a sound producing apparatus, particularly for use with toys, a combination comprising a support; a record rotatably mounted on said support and having at least one sound groove of varying depth; motor means for rotating said record; a tone arm movably mounted at one end on said support means, said tone arm having a stylus on the other end arranged to track said sound groove and to vibrate said tone arm when said motor rotates said record, and a rigid projection projecting upwardly from said tone arm between the ends thereof and adjacent said other end thereof; a loud speaker mounted on said support; and means for transmitting vibrations from said tone arm to said loud speaker and comprising a rigid elongated follower supported between its ends on said projection for pivoting about a pivot axis and having a first short arm between one of its ends and said pivot axis and a second substantially longer arm between said pivot axis and the other end thereof, and biasing means between said other end of said follower and said tone arm for biasing said one end of said follower into engagement with said loud speaker whereby said follower will transmit to said loud speaker substantially only those vibrations which are due to movement of said stylus in response to changes in the depth of the tracked sound groove while transmission of slow vibrations due to wobbling of the record will be substantially prevented.
Claim 3
Dependent Claim
14 words
A combination as defined in claim 1, wherein said biasing means comprises a spring.
Claim 4
Dependent Claim
20 words
A combination as defined in claim 1, wherein said tone arm and said follower are located in a common plane.
Claim 5
Dependent Claim
31 words
A combination as defined in claim 1, wherein said follower engages said loudspeaker at a point which is at least closely adjacent to an extension of the axis of said stylus.
Claim 6
Dependent Claim
27 words
A combination as defined in claim 1, wherein said tone arm comprises a pair of aligned bearings and said follower comprises trunnions rotatably accommodated in said bearings.
Claim 7
Dependent Claim
59 words
A combination as defined in claim 1, wherein said stylus bears against the record with a first force and said biasing means urges said follower against said loudspeaker with a second force, the ratio of the lengths of said first and second arms being at least substantially equal to the ratio of magnitudes of said first and second forces.
Claim 8
Dependent Claim
43 words
A combination as defined in claim 1, wherein said stylus bears against the record with a first force and said follower is biased against said loudspeaker with a second force, the ratio of said first and second forces being about three to one.
Claim 9
Dependent Claim
25 words
A combination as defined in claim 1, wherein the length of said first arm being a small fraction of the length of said second arm.
Claim 10
Dependent Claim
66 words
A combination as defined in claim 1, wherein said tonE arm has a first end portion which is turnable on said support about an axis which is substantially parallel to the axis of said record and a second end portion provided with said stylus, said loudspeaker comprising a diaphragm and a contact plate adjacent to but spaced from the second end portion of said tone arm.
Claim 11
Dependent Claim
54 words
A combination as defined in claim 9, wherein said first arm is in point contact with said contact plate and the location of said point contact is at least closely adjacent to an extension of the axis of said stylus, and further comprising means for yieldably biasing said contact plate against said first arm.
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) | 1976-01-09 | 1976-07-10 | 1977-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-09 | 1980-07-10 | 1981-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-09 | 1984-07-10 | 1985-01-09 | $7700.00 | Window Closed / Lapsed |