Patent ID: 7013813

Claim:
An adjustable work surface mechanism for use with a primary work surface and a secondary work surface, comprising: a link system, adapted to be pivotably attached at a first end to the primary work surface and adapted to be pivotably attached at a second end to the secondary work surface, to permit said secondary work surface to be displaced relative to said primary work surface; a link brake system arranged to selectably prevent or permit pivoting of said first end of said link system; a tilt mechanism adapted to mechanically connect said primary work surface and said secondary work surface so that when said first end of said link system is pivoted about a first axis, an angular position of said secondary work surface with respect to said primary work surface is kept substantially constant; and a tilt brake mechanism adapted to selectably prevent or permit tilting of said secondary work surface relative said second end, said tilt mechanism adapted to prevent said second work surface from tilting relative to the primary work surface when said tilt brake mechanism is in an engaged position and adapted to permit said second work surface to tilt when said tilt brake mechanism is in a disengaged position; said tilt mechanism having a tilt stop mechanism adapted to be arranged on said secondary work surface, to adjustably limit said pivoting of said secondary work surface between end positions and having a first disc and a second disc held in rotational cooperation by a loop, said secondary work surface being pivotable about a second axis, said first disc being rotatable about said first axis and attached to said first end, and said second disc being rotatable about said second axis and adapted to be linked to said secondary work surface, so that when said first end of said link system is pivoted about said first axis, said angular position is kept substantially constant by said second disc being rotated by said first disc via said loop, and said tilt stop mechanism comprising said loop being loosely arranged around said second disc, so that a slack is created in said loop, said slack being gradually stretched in a direction of tilting of said secondary work surface, by said loop being caught in a groove of said second disc and held by frictional forces, so that, when said slack is stretched fully in said direction of tilting, said loop prevents further tilting of said secondary work surface in said direction of tilting.