![]() ![]() In such a mechanical keyboard, as has been manufactured till now, the tactile indicators have been manufactured as cylindrical pins with a relatively large diameter, of approximately 3-3.5 mm in addition, each of these cylindrical pins is arranged in the centre of its square key or - more precisely, in the centre of the flat surface from which the pin protrudes at one end of each square key in some ways that is a positive aspect, but in others it has some disadvantages: the cells in fact - especially those with six small keys - have rather large dimensions and that, as H01H2217/014- Facilitation of operation Human engineering handicapped.H01H2217/00- Facilitation of operation Human engineering.Braille, liquid crystal displays, light emitting or optical elements push-button switch having a plurality of operating members associated with different sets of contacts, e.g. H01H13/83- Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g.H01H13/70- Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g.H01H13/00- Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g.H01H- ELECTRIC SWITCHES RELAYS SELECTORS EMERGENCY PROTECTIVE DEVICES.G09B21/002- Writing aids for blind persons.G09B21/004- Details of particular tactile cells, e.g.G09B21/003- Teaching or communicating with blind persons using tactile presentation of the information, e.g.G09B21/001- Teaching or communicating with blind persons.G09B21/00- Teaching, or communicating with, the blind, deaf or mute.G09B- EDUCATIONAL OR DEMONSTRATION APPLIANCES APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE MODELS PLANETARIA GLOBES MAPS DIAGRAMS.G09- EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS. ![]() 238000006011 modification reaction Methods 0.000 description 1.238000005859 coupling reaction Methods 0.000 description 1.229910002056 binary alloy Inorganic materials 0.000 description 1.238000004519 manufacturing process Methods 0.000 claims abstract description 9.239000011159 matrix material Substances 0.000 claims abstract description 18.239000002131 composite material Substances 0.000 claims abstract description 32. ![]() Publication of WO2005039882A2 publication Critical patent/WO2005039882A2/en Publication of WO2005039882A3 publication Critical patent/WO2005039882A3/en Links Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.) Filing date Publication date Priority to ITMI2003A001989 priority Critical Priority to ITMI20031989 priority patent/ITMI20031989A1/en Application filed by Appunto R & D S.R.L. Priority date (The priority date is an assumption and is not a legal conclusion. ( en Inventor Stefano Scatola Ermanno Marchesi Anna Rudari Original Assignee Appunto R & D S.R.L. Google Patents WO2005039882A2 - Keyboard for blind persons WO2005039882A2 - Keyboard for blind persons ![]()
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