US4127880A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tape recorder with coupling between the recording-switch and sound-level regulator
Assignee: GRUNDIG E M V ELEKTRO-MECHANISCHE VERSUCHSANSTALT
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Filing: 1977-07-13
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Granted: 1978-11-28
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Expires: 1997-07-13
Abstract
Abstract A tape recorder with combined on/off and sound regulating switch having means whereby when said tape recorder is turned on a variable resistor exhibits maximum resistance and thereafter returns to minimum resistance so that transient noise pulses are not recorded.
Inventors
- 👤 Reinhold Emmert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 00:54
CPC Classifications
G; G11; G11B; G11B15/00; G11B15/02; G11B15/10
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
141 words
In a tape recorder a combined on/off and sound regulating switch including: (a) a first slide bar movable from a first to a second position, (b) a second slide bar connected to a variable resistor, said variable resistor being in the record circuitry, (c) said second slide bar being moveable from a first position to a second position thereby changing the resistance of said variable resistor from minimum to maximum, (d) first means to move said first and second slide bars from a first position to a second position in unison, (e) second means for returning said second slide bar to a first position while maintaining said first slide bar in said position, whereby when said tape recorder is turned on said variable resistor exhibits maximum resistance and thereafter returns to minimum resistance so that transient noise pulses are not recorded.
Claim 2
Dependent Claim
141 words
In a tape recorder a combined on/off and sound regulating switch including: (a) a first slide bar movable from a first to a second position, (b) a second slide bar connected to a variable resistor, said variable resistor being in the record circuitry, (c) said second slide bar being moveable from a first position to a second position thereby changing the resistance of said variable resistor from minimum to maximum, (d) first means to move said first and second slide bars from a first position to a second position in unison, (e) second means for returning said second slide bar to a first position while maintaining said first slide bar in said position, whereby when said tape recorder is turned on said variable resistor exhibits maximum resistance and thereafter returns to minimum resistance so that transient noise pulses are not recorded.
Claim 3
Dependent Claim
30 words
A tape recorder in accordance with claim 1 in which the variable resistor is in the recording circuit of the sound head and wired in series after the recording amplifier.
Claim 4
Dependent Claim
59 words
A tape recorder in accordance with claim 1 in which said second means includes a first spring yieldingly urging said second slide bar to the first position thereof whereby upon movement thereof against the force of said first spring said second slide bar is moved to said second position and upon release is returned thereby to said first position.
Claim 5
Dependent Claim
85 words
A tape recorder in accordance with claim 3 in which a second spring is provided yieldingly urging said first slide bar to the first position thereof and said second means includes arresting means for arresting and maintaining said first slide bar in said second position upon return of said second slide bar to said first position and release means are provided for said arresting means whereby upon the release thereof said first slide bar can be returned by said second spring to said first position.
Claim 6
Dependent Claim
60 words
A tape recorder in accordance with claim 4 in which a first knob is attached to said second slide bar and an outer knob is attached to said first slide bar in operative association with said first knob for coupled movement therewith from said first to said second position and uncoupled movement thereof from said second to said first position.
Claim 7
Dependent Claim
26 words
A tape recorder in accordance with claim 5 in which the outer knob is provided with a keyway into which said first knob can be received.
Claim 8
Dependent Claim
14 words
A tape recorder in accordance with claim 6 in which said keyway is cylindrical.
Claim 9
Dependent Claim
14 words
A tape recorder in accordance with claim 6 in which said keyway is square.
Claim 10
Dependent Claim
14 words
A tape recorder in accordance with claim 6 in which said keyway is rectangular.
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) | 1981-11-27 | 1982-05-29 | 1982-11-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-11-27 | 1986-05-29 | 1986-11-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-11-27 | 1990-05-29 | 1990-11-28 | $7700.00 | Window Closed / Lapsed |