Adjustable desk frame

Claim 1

A frame to support a work surface, said frame comprising a base to rest upon a floor, said base including a pair of vertical members which are generally parallel and coextensive; extensive; a sub-frame vertically adjustably supported by the base, said sub-frame including a pair of vertical members guidably supported by the base vertical members, the sub-frame vertical members being generally parallel and co-extensive; and a manually driven drive assembly to move the sub-frame vertically relative to the base, said drive assembly including a rack gear fixed to one of said sub-frame vertical mlembers so as to extend vertically therealong, a pinion gear having a shaft and rotatably supported by said base so as to be rotatable about an axis transverse of the base vertical members and said pinion gear engaging said rack gear so as to drive the rack gear, a worm gear rotatably supported by the base and meshsingly engaged with a driven gear fixed to said shaft so as to be rotatable abou an axis normal to the axis of the pinion gear, a drive shaft having a longitudinal axis co-axial with the axis of the worm gear and drivingly fixed thereto, said drive shaft being pivotally attached to both said base and subframe, and wherein said drive shaft extends from teh worm gear to a position by thew ork surface that is manually rotatable by a user of the work surface, while being rotatable about the axis of the pinion to a transport position located adjacent the base vertical members.