Telescopic column for a height-adjustable table and height-adjustable table having such a telescopic column

A telescopic column for a height-adjustable table, wherein the telescopic column comprises:

• a cylindrical outer column having a circular outer cross-section and a circumference,
• a cylindrical inner column, having a circular outer cross-section, the cylindrical inner column being at least partially arranged within the outer column,
• several balls, and
• a tube-shaped ball cage configured to retain the balls at predetermined positions,
• wherein
• the outer column, along a longitudinal direction of the outer column on an inside of the outer column, comprises an outer column running surface section configured such that the balls roll over thereon,
• the inner column, along a longitudinal direction of the inner column on an outer cross-section of the inner column, comprises an inner column running surface section configured such that the balls roll over thereon, and
• the inner column and the outer column are configured such that the balls roll over in an at least almost backlash-free manner on the outer column running surface section and the inner column running surface section during an adjustment of a length of the telescopic column in a predefined range of motion of the balls in order to guide the inner column in the outer column, the outer column running surface section comprises, along the longitudinal direction of the outer column and distributed on the circumference of the cylindrical outer column, at least two longitudinal grooves respectively configured such that the balls can roll over in the longitudinal grooves during the adjustment in the range of motion,
• wherein the telescopic column further comprises a tube-shaped cover element which covers the inner column running surface section of the cylindrical inner column that is partially arranged within the outer column, the cover element being combined with the ball cage and thereby being positioned between the inner and outer columns, the cover element and the ball cage being moved together when the telescopic column is in an extracted state wherein the running surfaces on the inner column are coverable by the cover element and wherein the cover element covers at least the predetermined range of motion of the balls of the inner column running surface section when in the extracted state of the telescopic column such that the inner column running surface is not visible when the telescope column is in the extracted state,
• wherein the inner column comprises at least one guiding element is configured such that the at least one guiding element engages into one of the at least two longitudinal grooves in an at least almost backlash-free manner during the adjustment of the length of the telescopic column along an adjustment stroke of the telescopic column in order to align the inner column with respect to the outer column.