IT957562B - Perfezionamento nelle tastiere per macchine da scrivere e simili - Google Patents
Perfezionamento nelle tastiere per macchine da scrivere e similiInfo
- Publication number
- IT957562B IT957562B IT48948/72A IT4894872A IT957562B IT 957562 B IT957562 B IT 957562B IT 48948/72 A IT48948/72 A IT 48948/72A IT 4894872 A IT4894872 A IT 4894872A IT 957562 B IT957562 B IT 957562B
- Authority
- IT
- Italy
- Prior art keywords
- keyboards
- improvement
- similar
- typing machines
- typing
- Prior art date
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J5/00—Devices or arrangements for controlling character selection
- B41J5/08—Character or syllable selected by means of keys or keyboards of the typewriter type
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J5/00—Devices or arrangements for controlling character selection
- B41J5/08—Character or syllable selected by means of keys or keyboards of the typewriter type
- B41J5/14—Construction of key levers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J5/00—Devices or arrangements for controlling character selection
- B41J5/08—Character or syllable selected by means of keys or keyboards of the typewriter type
- B41J5/28—Multiple-action keys, e.g. keys depressed by two or more amounts or movable in two or more directions to effect different functions or selections
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H13/00—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch
- H01H13/70—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard
- H01H13/72—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard wherein the switch has means for limiting the number of operating members that can concurrently be in the actuated position
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US13693171A | 1971-04-23 | 1971-04-23 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| IT957562B true IT957562B (it) | 1973-10-20 |
Family
ID=22475066
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| IT48948/72A IT957562B (it) | 1971-04-23 | 1972-03-13 | Perfezionamento nelle tastiere per macchine da scrivere e simili |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US3722651A (it) |
| JP (1) | JPS5324845B1 (it) |
| CA (1) | CA966105A (it) |
| DE (1) | DE2219751A1 (it) |
| GB (1) | GB1391197A (it) |
| IT (1) | IT957562B (it) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3863748A (en) * | 1973-11-14 | 1975-02-04 | Singer Co | Shift lock mechanism |
-
1971
- 1971-04-23 US US00136931A patent/US3722651A/en not_active Expired - Lifetime
-
1972
- 1972-03-13 IT IT48948/72A patent/IT957562B/it active
- 1972-03-21 CA CA137,654A patent/CA966105A/en not_active Expired
- 1972-04-17 JP JP3784372A patent/JPS5324845B1/ja active Pending
- 1972-04-20 GB GB1847772A patent/GB1391197A/en not_active Expired
- 1972-04-21 DE DE19722219751 patent/DE2219751A1/de active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5324845B1 (it) | 1978-07-24 |
| DE2219751A1 (de) | 1972-11-09 |
| US3722651A (en) | 1973-03-27 |
| CA966105A (en) | 1975-04-15 |
| GB1391197A (en) | 1975-04-16 |
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