GB1330742A - Keyboard encoding arrangement for a telegraphic machine - Google Patents
Keyboard encoding arrangement for a telegraphic machineInfo
- Publication number
- GB1330742A GB1330742A GB1330742DA GB1330742A GB 1330742 A GB1330742 A GB 1330742A GB 1330742D A GB1330742D A GB 1330742DA GB 1330742 A GB1330742 A GB 1330742A
- Authority
- GB
- United Kingdom
- Prior art keywords
- transducers
- keyboard
- telegraphic
- piezo
- electrically insulating
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 239000002184 metal Substances 0.000 abstract 2
- 239000012858 resilient material Substances 0.000 abstract 2
- 238000010276 construction Methods 0.000 abstract 1
- 239000013078 crystal Substances 0.000 abstract 1
- 239000012777 electrically insulating material Substances 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L13/00—Details of the apparatus or circuits covered by groups H04L15/00 or H04L17/00
- H04L13/16—Details of the apparatus or circuits covered by groups H04L15/00 or H04L17/00 of transmitters, e.g. code-bars, code-discs
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Push-Button Switches (AREA)
- Impact Printers (AREA)
- Input From Keyboards Or The Like (AREA)
Abstract
1330742 Keyboards CREED & CO Ltd 5 Aug 1971 36835/71 Heading G4H In a telegraphic keyboard piezo-electric transducers are mounted in resilient electrically insulating material and selectively energized to give a coded electrical output by respective codebars. In Fig. 1 in response to depression of a key lever 1 having a unique pattern of notches, all code-bar actuators (not shown) are energized, only those code-bars beneath notches in the operated key lever, e.g. 3 and not 2, move to operate associated transducer 5. Each transducer comprises a piezo-electric crystal disc 6 sandwiched between metal cylinders and 8, the anvil 7 being smaller than the backstop 8. An array of transducers is enclosed in electrically insulating resilient material, e.g. rubber, in a housing, through which the projections on the metal cylinder 7 protrude. The resilient material may be in the form of plates (Fig. 2, not shown) or alternatively may in the construction of the keyboard be poured around the transducers and allowed to set.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3683571 | 1971-08-05 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1330742A true GB1330742A (en) | 1973-09-19 |
Family
ID=10391560
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1330742D Expired GB1330742A (en) | 1971-08-05 | 1971-08-05 | Keyboard encoding arrangement for a telegraphic machine |
Country Status (5)
| Country | Link |
|---|---|
| AU (1) | AU4513572A (en) |
| DE (1) | DE2238027A1 (en) |
| ES (1) | ES405571A1 (en) |
| FR (1) | FR2151270A5 (en) |
| GB (1) | GB1330742A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4258356A (en) | 1978-04-03 | 1981-03-24 | Scm Corporation | Multi bar encoding apparatus utilizing acoustic energy |
| USRE32419E (en) * | 1981-03-16 | 1987-05-12 | Engineering Research Applications, Inc. | Molded keyboard and method of fabricating same |
| US6400285B1 (en) * | 1992-10-08 | 2002-06-04 | Henry Gifford | Ergonomic keyboard |
-
1971
- 1971-08-05 GB GB1330742D patent/GB1330742A/en not_active Expired
-
1972
- 1972-07-27 FR FR7227019A patent/FR2151270A5/fr not_active Expired
- 1972-07-31 AU AU45135/72A patent/AU4513572A/en not_active Expired
- 1972-08-02 DE DE19722238027 patent/DE2238027A1/en active Pending
- 1972-08-05 ES ES405571A patent/ES405571A1/en not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4258356A (en) | 1978-04-03 | 1981-03-24 | Scm Corporation | Multi bar encoding apparatus utilizing acoustic energy |
| USRE32419E (en) * | 1981-03-16 | 1987-05-12 | Engineering Research Applications, Inc. | Molded keyboard and method of fabricating same |
| US6400285B1 (en) * | 1992-10-08 | 2002-06-04 | Henry Gifford | Ergonomic keyboard |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2151270A5 (en) | 1973-04-13 |
| ES405571A1 (en) | 1975-08-01 |
| DE2238027A1 (en) | 1973-02-15 |
| AU4513572A (en) | 1974-02-07 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PLNP | Patent lapsed through nonpayment of renewal fees |