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(11) | EP 0 091 284 A3 |
(12) | EUROPEAN PATENT APPLICATION |
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(54) | Contact keyboard and method of its manufacture |
(57) A contact keyboard comprising a plurality of keys (10) each having an actuator (11)
movable axially in opposition to the action of an elastic element (22) to effect the
connection of parts (23-25) of an electric circuit. The actuators (11) are slidable
in guide recesses (12) formed by moulding in a single block (15) of plastics material.
Assembly of the actuators, the guide block, the elastic elements and the electric
circuit on a supporting plate (16) can be effected automatically. Assembly takes place
with the block (15) upside down, on the plate (16). The actuators (12) are moulded
in one piece with connecting sprues and are inserted in one operation. The sprues
are then removed, the elastic elements (22) are put in place and then a printed circuit
board (26) is fitted. |