US4003087A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mechanism for use in magnetic tape recorder/player
Assignee: Victor Company of Japan Ltd
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Filing: 1974-12-02
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Granted: 1977-01-11
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Expires: 1994-12-02
Abstract
Abstract A record and a play keys of a magnetic tape recorder/player are depressed in order to set the recorder/player in its recording mode, and they are locked in their depressed positions by means of a first locking plate. In the above, the record key is further locked by means of a second locking plate due to the play key in its depressed position. When a stop key is depressed to stop the recording mode, the record and play keys are unlocked from the first locking plate so that the play key is released from its depressed position, and after the release of the play key, the record key is released from its depressed position.
Inventors
- 👤 Mitsuaki Iwasaki
- 👤 Hidehiro Kobayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:17
CPC Classifications
G; G11; G11B; G11B15/00; G11B15/02; G11B15/04; G11B15/10
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
139 words
A mechanism comprising: a keyboard including a first key, a second key and a third key; a first locking plate yieldingly urged to a locking position wherein said first and second keys can be held in their depressed positions when they are depressed, said first locking plate having a surface engaging with said third key such that upon depression of said third key, said first locking plate shifts to an unlocking position wherein said first and second keys are released; and second locking plate yieldingly urged to a locking position wherein said first key can be further held in the depressed position thereof when said second key is depressed, said second locking plate having a surface engaging with said second key such as to be held in said locking position thereof as long as said second key is depressed.
Claim 2
Dependent Claim
139 words
A mechanism comprising: a keyboard including a first key, a second key and a third key; a first locking plate yieldingly urged to a locking position wherein said first and second keys can be held in their depressed positions when they are depressed, said first locking plate having a surface engaging with said third key such that upon depression of said third key, said first locking plate shifts to an unlocking position wherein said first and second keys are released; and second locking plate yieldingly urged to a locking position wherein said first key can be further held in the depressed position thereof when said second key is depressed, said second locking plate having a surface engaging with said second key such as to be held in said locking position thereof as long as said second key is depressed.
Claim 3
Dependent Claim
149 words
A mechanism claimed in claim 1, wherein said first and second locking plates are positioned substantially in parallel with each other under said keyboard and biased in the opposite directions by means of biasing means, said first locking plate having at least two latch portions for holding said first and second keys, whilst said second locking plate has at least one latch portion for holding said first key, said first key being fixedly attached to a plate member which has an engaging portion to be locked in a depressed position by said first and second locking plates, said second key being fixedly attached to a plate member which has an engaging portion to be locked in a depressed position by said first locking plate, and the plate members being rotatably connected to a transversal axis positioned substantially in parallel with said first and second locking plates under said keyboard.
Claim 4
Dependent Claim
40 words
A mechanism claimed in claim 1, wherein said second locking plate further comprises another surface engaging with said third key such that said second locking plate is held in said locking position as long as said third key is depressed.
Claim 5
Dependent Claim
165 words
A mechanism for use in a magnetic tape recorder/player including a first key for actuating a recording-reproducing mode change switch, a second key for actuating a muting switch and a third key for stopping record operation of the recorder-player, said mechanism comprising: a first locking plate yieldingly urged to a locking position wherein said first and second keys can be locked in their depressed positions when they are depressed, said first locking plate having a surface engaging with said third key such that upon depression of said third key, said first locking plate shifts to an unlocking position wherein said first and second keys are released; and second locking plate yieldingly urged to a locking position wherein said first key can be further locked in the depressed position thereof when said second key is depressed, said second locking plate having a surface engaging with said second key such as to be held in said locking position thereof as long as said second key is depressed.
Claim 6
Dependent Claim
165 words
A mechanism for use in a magnetic tape recorder/player including a first key for actuating a recording-reproducing mode change switch, a second key for actuating a muting switch and a third key for stopping record operation of the recorder-player, said mechanism comprising: a first locking plate yieldingly urged to a locking position wherein said first and second keys can be locked in their depressed positions when they are depressed, said first locking plate having a surface engaging with said third key such that upon depression of said third key, said first locking plate shifts to an unlocking position wherein said first and second keys are released; and second locking plate yieldingly urged to a locking position wherein said first key can be further locked in the depressed position thereof when said second key is depressed, said second locking plate having a surface engaging with said second key such as to be held in said locking position thereof as long as said second key is depressed.
Claim 7
Dependent Claim
156 words
A mechanism for use in a magnetic tape recorder/player claimed in claim 4, wherein said first and second locking plates are positioned substantially in parallel with each other under each keyboard and biased in the opposite directions by means of biasing means, said first locking plate having at least two latch portions for holding said first and second keys, whilst said second locking plate has at least one latch portion for holding said first key, said first key being fixedly attached to a plate member which has an engaging portion to be locked in a depressed position by said first and second locking plates, said second key being fixedly attached to a plate member which has an engaging portion to be locked in a depressed position by said first locking plate, and the plate members being rotatably connected to a transversal axis positioned substantially in parallel with said first and second locking plates under said keyboard.
Claim 8
Dependent Claim
47 words
A mechanism for use in a magnetic tape recorder-player claimed in claim 4, wherein said second locking plate further comprises another surface engaging with said third key such that said second locking plate is held in said locking position as long as said third key is depressed.
References Cited (Backward Citations)
US2973664A
Cited
US3735054A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-01-11 | 1980-07-12 | 1981-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-01-11 | 1984-07-12 | 1985-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-01-11 | 1988-07-12 | 1989-01-11 | $7700.00 | Window Closed / Lapsed |