Patent ID: 7484805

Claim:
A seat or table or a pair of parallel moving surfaces connected by three or more pantograph or “lazy tongs” arrangements, whereby the separation between the two surfaces may be adjusted; where said adjustable separation is achieved by means of pairs of “travelers” threadably connected to “driving rods” by means of differentially “handed” threads; said driving rods all mounted to a substantially flat first surface, with one pair of said travelers driving the proximal end of each pantograph, and where all said driving rods are connected by gearing end-to-end in a ring-type configuration, so disposed as to allow all the driving rods to rotate in concert; and where the distal end of each pantograph is hingeably connected to a second substantially flat mounting surface, so that when the said driving rods are rotated the separation between the two said surfaces is altered by means of the expansion or contraction of the driven “lazy tongs” pantographs.