Patent ID: 9480333
Filing Date: 2016-11-01
CPC Classification: A47B,F16H,Y10T

Claim Text:
1. A lifting column comprising: a guide consisting of a first member, a second member and a third member telescopically arranged relative to each other, and a spindle unit comprising a first spindle, which with an end is secured to an end of the first member of the guide, a second spindle with a first spindle nut secured thereto, said first spindle nut cooperating with the first spindle, a second spindle nut secured against rotation and cooperating with the second spindle, a drive tube which cooperates with the second spindle for driving the second spindle, a first part of a clutch at an upper end of the drive tube, a motor unit with a reversible electric motor and a transmission, the transmission including a second part of the clutch for cooperating with the first part of the clutch at the upper end of the drive tube for driving the drive tube, wherein the second member of the guide with a lower end is secured to a lower end of the second spindle, wherein the second spindle nut cooperates with the second spindle and is connected to a first bearing by means of a rigid connection tube which is fixed to a shaft stub secured to an end of the drive tube, wherein the shaft stub is secured via a second bearing, and wherein at the upper end of the rigid connection tube is mounted a bushing with a ring shaped groove for receiving an outer side of the second bearing.