An elevating apparatus of a table is disclosed. It mainly comprises a height adjusting apparatus having a gas spring inserted into an inner column of each of two legs respectively, a chute disposed outside the inner column and corresponding to a guide rail of a hollow outer column, a guide gear pivotally connected to a teeth-guiding slot of the hollow outer column, a gear rack disposed at one side of the inner column adjacent to the guide gear, and a pulley pivotally connected to a pulley slot of the hollow outer column for contacting the inner column, wherein two lateral sides of the chute are provided with plural arc portions equally spaced apart from each other for contacting the guide rail.

A height-adjustable work surface assembly includes a base portion and a work portion, and may include a gas spring, an actuation mechanism, a rack, and a pinion. The work portion is supported by the base portion for translation along a first path of motion. The gas spring is actuatable between a locked position and an unlocked position, and is operable to apply a force on the work portion in the unlocked position to urge the work portion along the first path of motion. The actuation mechanism is coupled to the gas spring to move the gas spring from the locked to the unlocked position. The rack is supported by the work portion or the base portion and includes a first plurality of teeth. The pinion is supported by the other of the work portion and the base portion and includes a second plurality of teeth.

An adjustable height table base assembly includes two or more leg assemblies each including a mobile leg member, a stationary leg member, and a linear motion system. The mobile and stationary leg members are each formed of a flat vertical support structure. The leg assemblies are configured to extend and retract to adjust a height position of the mobile leg member and any table top secured to the mobile leg member. The mobile leg members slide in a parallel direction in relation to the stationary leg members by means of linear motion systems. The power mechanism for the adjustable height table may comprise a counterbalance mechanism or one or more electric motors. Optionally, each of the leg assemblies also includes a non-load bearing cover enclosing at least a portion of the mobile leg member and at least a portion of the stationary leg member.