Abstract: A linear actuator for height adjustable columns comprising a threaded spindle with a longitudinal extension along a longitudinal axis, the spindle being adapted to be rotated by a driving shaft, characterized in that the spindle is provided with a right-hand thread at a first portion of the longitudinal extension and a left-hand thread at a second portion of the longitudinal extension. The linear actuator further comprises one right-hand threaded nut member and one left-hand threaded nut member. At least one of the nut members comprises a first and a second part configured to be in threaded connection with the spindle on opposing sides of the spindle. The threaded connection of the right-hand and left-hand threaded nut member to the spindle provides opposite linear movement of the right-hand threaded nut member relative the left-hand threaded nut member along the longitudinal axis.

Abstract: A linear actuator for height adjustable columns comprising a threaded spindle with a longitudinal extension along a longitudinal axis, the spindle being adapted to be rotated by a driving shaft, characterized in that the spindle is provided with a right-hand thread at a first portion of the longitudinal extension and a left-hand thread at a second portion of the longitudinal extension. The linear actuator further comprises one right-hand threaded nut member and one left-hand threaded nut member. At least one of the nut members comprises a first and a second part configured to be in threaded connection with the spindle on opposing sides of the spindle. The threaded connection of the right-hand and left-hand threaded nut member to the spindle provides opposite linear movement of the right-hand threaded nut member relative the left-hand threaded nut member along the longitudinal axis.

Abstract: The invention relates to a method (100) for manufacturing a fastening arrangement for fastening a collar to a tube. The method comprises the steps of providing a hollow tube (10), arranging said tube for receiving at least one forming punch (30) in the axial direction of the tube, punching the tube with a forming punch at an inner radial part of an edge portion (16) of the tube in the axial direction of the tube, locally reducing the tube thickness, so that the material being punched is plastically relocated in the axial direction, locally forming a snap portion (11) in the form of a flange (12) in the radial direction towards the hollow inside of the tube, providing a collar (20) configured to be arranged on the tube, wherein the collar comprises at least one receiving portion (21) arranged to receive said snap portion, and arranging the collar to the tube such that the snap portion engages with said receiving portion.

Abstract: The present invention relates to a telescopic column, comprising at least a first and a second telescopic tube, a first static stabilizing device, a second static stabilizing device, and a mobile stabilizing device, wherein the first and the second stabilizing devices are arranged axially separated at a fixed distance from each other, between the first and a second tube. The mobile stabilizing device is arranged in an inner space of the first tube, and the mobile stabilizing device is axially movable in relation to the first and second static stabilizing devices, and in relation to the first tube, during extension and retraction of the telescopic column.