| 摘要 |
A desk frame including a base consisting of a pair of vertically extending transversely spaced members, a sub-frame vertically movably adjustably supported by the base, and including a pair of vertically extending members telescopically received within the vertical members of the base, a drive assembly to move the subframe vertically relative to the base, the drive assembly including a rack gear attached to each vertical member of the sub-frame, a pinion gear meshingly engaged with each rack, with the pinion gears being rotatably supported by the base, a shaft extending between the two pinions to transmit rotary power therebetween, a worm gear meshingly engaged with one of the pinions, and rotatably supported by the base, a drive shaft fixed to the worm gear and extending therefrom to a position manually operable by a user of the desk, and wherein the drive shaft is also adapted to be supported by the sub-frame. |
