Method of manufacturing keyswitch assemblies

A method of manufacturing a contact switch assembly for a keyboard comprising a circuit board having at least one first contact and at least one second contact provided on one side of said board, at least one electrically conductive curved resilient plate selectively electrically communicating between pairs of said first and second contacts and a retaining element comprising a film including a heat sealable thermoplastic material which maintains said resilient plates in position, comprising the steps of:

• locating said electrically conductive curved resilient plates over said one side of said circuit board with at least a portion of their peripheries in electrical communication with respective ones of said second contacts;
• placing said retaining element over said one side of said circuit board, said heat sealable thermoplastic material being in contact with said resilient plates and said circuit board side;
• placing the assembly in a press and applying pressure to the assembly at an elevated temperature for a predetermined time thereby bonding said heat sealable thermoplastic material to said plates and to said one circuit board side;
• and
• removing the assembly from the press.