Lifting column

摘要

A lifting column, preferably for height-adjustable tables comprises a guide with three mutually telescopic members (1,2,3) and a motor driven spindle unit for bringing about the movement. The second member (2) of the guide is with a lower end secured to a lower end of the second spindle (6). The second spindle nut (8) co-operating with the second spindle (6) is with a bearing (18) with a rigid connection (28) fixed to a shaft stub (16) secured to an upper end of a drive tube (9). The shaft stub (16) is via a second bearing (20) secured to a mounting plate (23), by means of which the spindle unit is secured in the lifting column. Thus, the vertical load on the lifting column is led through the spindle unit around the guide (1,2,3). This enables a better and more optimum dimensioning of the guide (1,2,3) and the spindle unit, just as it is advantageous in terms of assembly and not least it enables a better implementing of a squeeze protection in the lifting columns.

主权项

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.