A dual-column office table includes two oppositely disposed stationary upright columns with a connecting rod transversely connected therebetween, two guiding columns separately disposed in the two stationary upright columns, at least one steel ball sleeve fitted on either guiding column, two driving units separately disposed in the two guiding columns, and a table top to which a top portion of each guiding column is fixedly connected. A bottom end of each guiding column is provided with a limiting structure protruding outward. A bottom end of the each driving unit is fixed to a respective table base provided at bottom portion of each stationary upright column. The table top has a bottom surface fixedly connected with a fixing seat and is provided with a lifting control switch, the lifting control switch being connected with the driving units and having an end disposed in the fixing seat.

A dual-column office table includes two oppositely disposed stationary upright columns with a connecting rod transversely connected therebetween, two guiding columns separately disposed in the two stationary upright columns, at least one steel ball sleeve fitted on either guiding column, two driving units separately disposed in the two guiding columns, and a table top to which a top portion of each guiding column is fixedly connected. A bottom end of each guiding column is provided with a limiting structure protruding outward. A bottom end of the each driving unit is fixed to a respective table base provided at bottom portion of each stationary upright column. The table top has a bottom surface fixedly connected with a fixing seat and is provided with a lifting control switch, the lifting control switch being connected with the driving units and having an end disposed in the fixing seat.

A modular bearing segment is disclosed. The modular bearing segment having a first end and a second end and can include a retainer defining at least one bearing track having an open load bearing portion; a plurality of bearings positioned within the at least one bearing track; a bearing plate in load bearing communication with less than all of the plurality of bearings and positioned opposite the retainer; and a lid positioned on the bearing plate, fixed to the retainer and defining a rocker element retaining hole positioned above the bearing plate.

A linear motion bearing assembly comprising a load bearing plate structure having at least a portion of a plurality of open axial ball tracks formed therein, each of said plurality of open axial ball tracks comprised of at least two concentric ball tracks. The ball tracks including an open load bearing portion, an open return portion and turnarounds interconnecting the load bearing and return portions. A plurality of bearing balls are disposed in the ball tracks. At lease one load bearing plate is axially positioned adjacent said load bearing plate structure for receiving load from the balls disposed in the load bearing portion of the ball tracks. Various outer housing sleeves are disclosed including a structure split axially and a monolithic structure.

A linear motion bearing assembly comprising a rolling element retainer structure and an outer housing sleeve enclosing substantially all of an exposed exterior surface of said rolling element retainer structure. A bearing block effective to enclose substantially all of an exposed exterior surface of the outer housing sleeve, the bearing block including a first bearing block segment effective to enclose a first part of the outer housing sleeve; and a second bearing block segment effective to enclose a second part of the outer housing sleeve, wherein the first bearing block segment and the second bearing block segment include first elements and second elements effective to interlock with each other when the bearing block encloses the outer housing sleeve.