Patent US3814441A successfully refreshed from Google Patents.
US3814441A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recording arm safety lifter
Assignee: Meritor Inc
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Filing: 1972-09-21
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Granted: 1974-06-04
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Expires: 1992-09-21
Abstract
Abstract There is disclosed a disc type magnetic recording and playing system wherein a recording arm tracks over concentric circular tracks in a flexible magnetic disc. There is also disclosed apparatus for swinging the recording arm into position with the record/playback transducer centered within a given track, and a stepping motor for stepping the transducer from track to track. A safety lifting device is provided for prevention of excessive wear of any one track. The safety lifting device is under the control of a solenoid which in turn is energized through a timer. When any of several operating controls are activated the timer is set and the solenoid is energized. After a predetermined period of time, the timer deenergizes the solenoid, and the arm is raised automatically. Raising of the arm is accomplished by a spring which works against the solenoid so that there is always a positive arm lifting moment which in the absence of an energizing current to the solenoid, raises the arm. Thus ''''fail safe'''' operation is provided.
Inventors
- 👤 L Craggs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:41
CPC Classifications
G; G11; G11B; G11B19/00; G11B19/20; G11B19/02; G11B19/04; G11B5/00; G11B5/48; G11B5/54; H; H04; H04N; H04N5/00; H04N5/76; H04N5/78; H04N5/781
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
77 words
In a disc magnetic recorder having a rotatable magnetic record disc, an arm extending across said disc, a transducer mounted on said arm, and positioning means connected to move said transducer to follow different tracks around said disc, the improvement comprising means for lifting said transducer away from said disc, and a timer connected to actuate said lifting means whenever said transducer has been placed in actuating interface with said disc for a predetermined period of time.
Claim 2
Dependent Claim
77 words
In a disc magnetic recorder having a rotatable magnetic record disc, an arm extending across said disc, a transducer mounted on said arm, and positioning means connected to move said transducer to follow different tracks around said disc, the improvement comprising means for lifting said transducer away from said disc, and a timer connected to actuate said lifting means whenever said transducer has been placed in actuating interface with said disc for a predetermined period of time.
Claim 3
Dependent Claim
110 words
In a magnetic recorder of the type in which a transducer is arranged to follow repetitively a track on a magnetic recording surface, including a transducer mounted for movement toward and away from a recording position, a magnetic recording member and means for moving said member repetitively past said recording position causing said transducer to follow a predetermined track thereon, the improvement comprising means for lifting said transducer away from said recording member to a known operative position displaced from said recording position, and a timer connected to tend to actuate said lifting means whenever said transducer is placed in said recording position at a predetermined time after such placement.
Claim 4
Dependent Claim
110 words
In a magnetic recorder of the type in which a transducer is arranged to follow repetitively a track on a magnetic recording surface, including a transducer mounted for movement toward and away from a recording position, a magnetic recording member and means for moving said member repetitively past said recording position causing said transducer to follow a predetermined track thereon, the improvement comprising means for lifting said transducer away from said recording member to a known operative position displaced from said recording position, and a timer connected to tend to actuate said lifting means whenever said transducer is placed in said recording position at a predetermined time after such placement.
Claim 5
Dependent Claim
40 words
The improvement of claim 2 said lifting means comprising: an arm for supporting said transducer, a spring for lifting said arm, and a solenoid connected to said timer and operative when energized to oppose the lifting action of said spring.
Claim 6
Dependent Claim
86 words
The improvement of claim 2 said lifting means comprising: an arm for pivotally supporting said transducer relative to said recording surface, a bracket pivotally mounted relative to said arm, means mounted on said bracket for engaging said arm and lifting it into said operative position, a spring attached to said bracket for causing engagement of the bracket with said arm as aforesaid, and a solenoid connected to said timer and operative when energized to engage said bracket and cause disengagement of the bracket from said arm.
Claim 7
Dependent Claim
32 words
Apparatus according to claim 2 said timer comprising a normally charged capacitor and means for momentarily discharging said capacitor upon generation of a command for placing said transducer in said recording position.
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) | 1977-06-03 | 1977-12-03 | 1978-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-03 | 1981-12-03 | 1982-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-03 | 1985-12-03 | 1986-06-04 | $7700.00 | Window Closed / Lapsed |