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Rotating plane keyboard

  • US 5,351,066 A
  • Filed: 07/08/1991
  • Issued: 09/27/1994
  • Est. Priority Date: 07/08/1991
  • Status: Expired due to Fees
First Claim
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1. An adjustable keyboard for data input, comprising:

  • (a) a base member for contact with a support surface, said base member defining a longitudinal base plane extending through said base member, said base member having a distal side intended for orientation away from a user and a proximate side intended for orientation adjacent a user and first and second ends joining said distal and proximate sides;

    (b) a first demi-board means having a distal side for orientation away from a user and a proximate side for orientation adjacent a user, defining a first demi-board plane extending longitudinally through said first demi-board means, pivotably connected to said base member and constrained for pivotal movement of said first demi-board means for reproducing a pre-determined arc and reproducible positions between a retracted position in which said first demi-board plane is substantially co-planar and parallel with said base plane and an extended position in which said first demi-board means extends at an acute angle with respect to said base member;

    (c) a plurality of user activated keys extending from a face of said first demi-board means, said keys facing away from said base member;

    (d) a second demi-board means having a distal side for orientation away from a user and a proximate side for orientation adjacent a user, defining a second demi-board plane extending longitudinally through said second demi-board means, pivotably connected to said base member and constrained for pivotal movement of said second demi-board means for reproducing a predetermined arc and reproducible positions between a retracted position in which said second demi-board plane is substantially co-planar and parallel with said base plane and an extended position in which said second demi-board means extends at an acute angle with respect to said base member;

    (e) a plurality of user activated keys extending from a face of said second demi-board means, said keys facing away from said base member;

    (f) when in said extended position said base plane, first demi-board plane, second demi-board plane and proximate sides of said first and second demi-board means forming a tetrahedral shape wherein;

    (i) the distal side of one of said demi-board means is located closer to the other demi-board means than the proximate side of said one of said demi-board means;

    (ii) said first and second planes each intersect with said base plane to form an acute angle;

    (iii) said first and second intersect with each other at an apex intersecting line in space, said apex intersecting line being in non-parallel alignment with the base plane; and

    (iv) said first, second and base planes intersect with each other at an intersecting point in space beyond the distal side of said base member.

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