Patents Assigned to Alphameric Keyboards Limited
  • Keyboards
    Patent number: 3964593
    Abstract: A key for an electronic keyboard comprises a plunger in a body which is mounted on the keyboard chassis and striker, with a helical spring within the plunger for engaging the striker. To provide required tactile characteristics, a further spring means, e.g., a bowed diaphragm, is arranged between the plunger and the striker and also a snap-action spring is arranged between the plunger and the body.
    Type: Grant
    Filed: April 8, 1974
    Date of Patent: June 22, 1976
    Assignee: Alphameric Keyboards Limited
    Inventor: Peter Pointon
  • Capacitive key for electronic circuit
    Patent number: 3951250
    Abstract: In a keyboard for an electronic circuit having a striker on each key formed of electronic material which is conductive or carries a conductor and which is moved downwardly towards a fixed conductor assembly to provide capacitive coupling, it is found that electrostatic charges can be generated by operation of a key which give spurious outputs. The present invention provides constructions for reducing the effects of such charges.
    Type: Grant
    Filed: April 8, 1974
    Date of Patent: April 20, 1976
    Assignee: Alphameric Keyboards Limited
    Inventors: Peter Pointon, Ian Robert Prince, Wolfgang Bial
  • Keyboard structure having panel mounted key actuators with electrical component operating element
    Patent number: 3940578
    Abstract: An electronic keyboard has a chassis with keys each utilising a parallel motion linkage to permit movement of an operating member towards an electric circuit element. The main structure of the keys and linkage may be formed as a unitary plastics moulding.
    Type: Grant
    Filed: April 9, 1974
    Date of Patent: February 24, 1976
    Assignee: Alphameric Keyboards Limited
    Inventor: Peter Pointon