US3785586A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Friction wheel drive especially for cassette magnetic tape recorders
Assignee: Individual
•
Filing: 1972-01-28
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Granted: 1974-01-15
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Expires: 1992-01-28
Abstract
Abstract A flywheel is driven from a motor output shaft by resilient power transmission means, and has a smaller diameter sleeve or hub rotatable therewith. A shaft secured to the flywheel extends concentrically through the hub or sleeve, and has a diameter substantially less than the internal diameter of the hub. An additional sleeve is telescoped over this shaft, and has a cutaway portion therein at a distance from the flywheel equal to the axial length of the first-mentioned hub, this cutaway exposing the shaft. The flywheel is rotatably mounted on a setting lever which is operable to set positions by means of a manually displaceable cam wheel acting through a spring. In one position of the parts, the hub engages a counterwheel driving a further friction wheel associated with a shaft mounting a rewind pulley and, in another position of the lever, a friction wheel secured to a shaft associated with the forward drive reel extends into the cutaway portion to directly engage the shaft secured to the flywheel, for low speed forward movement of the tape.
Inventors
- 👤 H Engert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 07:26
CPC Classifications
G; G11; G11B; G11B15/00; G11B15/18; G11B15/44; G11B15/442; G11B15/26
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
182 words
In a magnetic tape recorder having reel carrier shafts, a driving motor, and a setting lever having stop, forward and rewind settings, and further having a friction wheel drive including a belt pulley, serving as a flywheel mass and rotatably mounted on the setting lever, a belt drive connecting the motor to the belt pulley, respective counterwheels on the reel carrier shafts, an intermediate wheel engageable with one counterwheel, and friction wheel means rotatable with the belt pulley and selectably engageable with either the other counterwheel or the intermediate wheel: the improvement comprising, in combination, a bearing sleeve secured to said setting lever and resistant to the setting lever movement; and a torsion-resistant shaft rotatably engaged in said bearing sleeve and secured to said rotatable belt pulley for rotation therewith; said bearing sleeve having a cutaway portion intermediate iTs ends at substantially the plane of rotation of said other counterwheel; whereby, upon movement of said setting lever to an end position said other counterwheel is engageable with said torsion-resistant shaft acting as a friction wheel and included in said friction wheel means.
Claim 2
Dependent Claim
182 words
In a magnetic tape recorder having reel carrier shafts, a driving motor, and a setting lever having stop, forward and rewind settings, and further having a friction wheel drive including a belt pulley, serving as a flywheel mass and rotatably mounted on the setting lever, a belt drive connecting the motor to the belt pulley, respective counterwheels on the reel carrier shafts, an intermediate wheel engageable with one counterwheel, and friction wheel means rotatable with the belt pulley and selectably engageable with either the other counterwheel or the intermediate wheel: the improvement comprising, in combination, a bearing sleeve secured to said setting lever and resistant to the setting lever movement; and a torsion-resistant shaft rotatably engaged in said bearing sleeve and secured to said rotatable belt pulley for rotation therewith; said bearing sleeve having a cutaway portion intermediate iTs ends at substantially the plane of rotation of said other counterwheel; whereby, upon movement of said setting lever to an end position said other counterwheel is engageable with said torsion-resistant shaft acting as a friction wheel and included in said friction wheel means.
Claim 3
Dependent Claim
51 words
In a magnetic tape recorder, the improvement claimed in claim 1, including an annular friction wheel secured to rotate with said belt pulley and included in said friction wheel means; said annular friction wheel being engageable with said intermediate wheel, and being telescoped over said bearing sleeve and bearing engagement therewith.
Claim 4
Dependent Claim
37 words
In a magnetic tape recorder, the improvement claimed in claim 2, in which the axial spacing of said cutaway portion form said belt pulley is of the order of the axial length of the annular friction wheel.
Claim 5
Dependent Claim
41 words
In a magnetic tape recorder, the improvement claimed in claim 2, in which said cutaway portion is a cutaway segment having an angular extent in excess of 180* by an amount sufficient to completely expose the periphery of said torsion-resistant shaft.
Claim 6
Dependent Claim
26 words
In a magnetic tape recorder, the improvement claimed in claim 2, in which said belt pulley and said annular friction wheel constitute an integral one-piece structure.
Claim 7
Dependent Claim
33 words
In a magnetic tape recorder, the improvement claimed in claim 1, in which said bearing sleeve is mounted on said setting lever in spaced relation to the pivot axis of said setting lever.
Claim 8
Dependent Claim
27 words
In a magnetic tape recorder, the improvement claimed in claim 6, in which said bearing sleeve is secured to said setting lever to form a unit therewith.
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) | 1977-01-14 | 1977-07-16 | 1978-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-14 | 1981-07-16 | 1982-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-14 | 1985-07-16 | 1986-01-15 | $7700.00 | Window Closed / Lapsed |