Lifting unit for height-adjustable table or chair; has hydraulic action telescopic column and operation device with brake part that co-operates with counter brake part fixed to inner tube of column

摘要

The unit has a telescopic column (S) comprising an inner (1) and an outer (2) tube. A hydraulic spring (8) and a push rod are arranged inside the column. The inner tube can be moved with respect to the outer tube by operation (16) and brake (17) devices. A brake part (20) directly secured to the operation device co-operates with a counter brake part (21) fixed to the inner tube.