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KEYBOARD SWITCH ASSEMBLY WITH IMPROVED MOVABLE CONTACT HAVING CANTILEVER SUPPORTED CENTRAL MEMBER WITH RADIALLY EXTENDING CONTACT FINGERS

  • US 3,777,082 A
  • Filed: 09/08/1972
  • Issued: 12/04/1973
  • Est. Priority Date: 09/08/1972
  • Status: Expired due to Term
First Claim
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1. In a keyboard including a plurality of key stations for providing electrical data signals uniquely identifying each key station as it is actuated, an electrical switch for each key station comprising:

  • an insulated base member;

    an array of fixed electrical contacts positioned in fixed relationship on said base member;

    insulative spacing means on said base member adjacent said array of fixed electrical contacts;

    a sheet of flexible conducting material supported on said spacing means in spaced relationship to said array of fixed electrical contacts and including an opening therein;

    a movable electrical contact positioned within said opening of said sheet, said movable contact including a central member with a plurality of contact fingers positioned in alignment with associated fixed electrical contacts and means coupling said central member to an edge of said sheet adjacent said opening in a manner such that when the key station is actuated, said central member moves in a controlled manner to assure a predetermined contact finger will contact an associated fixed contact last in the sequence of engagement of said contact fingers to said fixed contacts.

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