US3640368A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Braille typewriter
Assignee: State of Israel
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Filing: 1969-08-14
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Granted: 1972-02-08
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Expires: 1989-08-14
Abstract
Abstract Apparatus for converting a standard typewriter to record in Braille includes a plurality of character-key switches, a Braille recording device, an electrical switching network between the character-key switches and the recording pin actuators of the Braille recording device, and record sheet advancing means. The electrical switching network includes a diode matrix having an input line for each character key and an output line for each recording pin actuator, and a pulse generator connected to each recording pin actuator. The standard typewriter has a shift-key and one or more double-element keys and therefore the apparatus includes a switch for each of these keys, and a circuit having a pair of AND gates for each of the double-element keys controlling the switching network in accordance with whether or not the shift-key is depressed with a double-element key.
Inventors
- 👤 Hershel Weinberger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:39
CPC Classifications
B; B41; B41J; B41J3/00; B41J3/32
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
314 words
Apparatus for recording in Braille, comprising a typewriter including a plurality of character-keys, a shift key, and at least one double-element key effective to selectively print one of two elements; a character-key switch for each character-key and actuated upon depression of the respective character-key; a shift key switch actuated upon depression of the shift key; a further switch for each dOuble-element key actuated upon depression of the respective double-element key; a Braille recording device including a plurality of recording pins for recording on a record sheet in accordance with the Braille code; an actuator for each recording pin; an electrical switching network connected between said character-key switches and the recording pin actuators for actuating those of the latter corresponding in the Braille code to the character-key depressed; a selection circuit effective to select the recording pin actuators corresponding to one element of the double element key depressed, when the shift key is depressed concurrently with the double-element key, and to select the recording pin actuators corresponding to the other element of the double-element key depressed when the double-element key is depressed alone; and record sheet advancing means for advancing the record sheet upon each depression of a character-key or double-element key; said selection circuit including a first and a second AND gate for said double-element key; said first AND gate including two input conductors one connected to said shift key switch and the other connected to the respective double-element key switch, and an output conductor connected to the input conductor of the electrical switching network corresponding to one of its two elements; said second AND gate including an inverter and two input conductors one connected to said shift-key switch through said inverter and the other connected to the respective doubleelement key switch, and an output conductor connected to the input conductor of the electrical switching network corresponding to the other of its two elements.
Claim 2
Dependent Claim
314 words
Apparatus for recording in Braille, comprising a typewriter including a plurality of character-keys, a shift key, and at least one double-element key effective to selectively print one of two elements; a character-key switch for each character-key and actuated upon depression of the respective character-key; a shift key switch actuated upon depression of the shift key; a further switch for each dOuble-element key actuated upon depression of the respective double-element key; a Braille recording device including a plurality of recording pins for recording on a record sheet in accordance with the Braille code; an actuator for each recording pin; an electrical switching network connected between said character-key switches and the recording pin actuators for actuating those of the latter corresponding in the Braille code to the character-key depressed; a selection circuit effective to select the recording pin actuators corresponding to one element of the double element key depressed, when the shift key is depressed concurrently with the double-element key, and to select the recording pin actuators corresponding to the other element of the double-element key depressed when the double-element key is depressed alone; and record sheet advancing means for advancing the record sheet upon each depression of a character-key or double-element key; said selection circuit including a first and a second AND gate for said double-element key; said first AND gate including two input conductors one connected to said shift key switch and the other connected to the respective double-element key switch, and an output conductor connected to the input conductor of the electrical switching network corresponding to one of its two elements; said second AND gate including an inverter and two input conductors one connected to said shift-key switch through said inverter and the other connected to the respective doubleelement key switch, and an output conductor connected to the input conductor of the electrical switching network corresponding to the other of its two elements.
Claim 3
Dependent Claim
25 words
Apparatus according to claim 1, wherein said electrical switching network includes a pulse generator at the output side thereof connected to each recording pin actuator.
Claim 4
Dependent Claim
36 words
Apparatus according to claim 2, wherein said pulse generators are also connected to said record sheet advancing means for applying a pulse to the latter to advance the record sheet following each depression of a character-key.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-02-07 | 1975-08-09 | 1976-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-07 | 1979-08-09 | 1980-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-07 | 1983-08-09 | 1984-02-08 | $7700.00 | Window Closed / Lapsed |