EP 0280491 A2 19880831 - Contact-type keyboard for typewriters.
Title (en)
Contact-type keyboard for typewriters.
Title (de)
Kontaktgebende Tastatur für Schreibmaschinen.
Title (fr)
Clavier à contact pour machines à écrire.
Publication
Application
Priority
IT 5306987 U 19870226
Abstract (en)
The contact-type keyboard (11) comprises a plurality of keys (12), each having an actuator (13) which is movable axially for co-operating with an elastic element (14) formed by a rubber dome portion in the form of an inverted cup. Fixed inside each dome portion (14) is a conducting pellet 21 for short-circuiting two corresponding elements (22) of a printed circuit (23). A stop element (27) which is housed within each dome portion (14) is in the form of a circular ring and is coaxial and concentric with the conducting pellet (21) and is capable of being stopped by the stop surface (28) on which the element (22) of the printed circuit (23) is fixed. The stop element (27) also projects within the dome portion (14), is opposite to a circular external ring (26) capable of co-operating with the respective actuator (13), and is disposed between a peripheral diaphragm (17) and a radially internal diaphragm (18) which are of limited and uniform thickness and which are adjacent to the stop element (27).
IPC 1-7
IPC 8 full level
H01H 13/702 (2006.01)
CPC (source: EP)
H01H 13/702 (2013.01); H01H 2215/004 (2013.01); H01H 2227/022 (2013.01)
Designated contracting state (EPC)
DE FR GB
DOCDB simple family (publication)
EP 0280491 A2 19880831; EP 0280491 A3 19900110; IT 210475 Z2 19881230; IT 8753069 V0 19870226
DOCDB simple family (application)
EP 88301485 A 19880222; IT 5306987 U 19870226