# US 2014/0360415 A1 · Lifting column, preferably for height adjustable tables

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- Number: US 2014/0360415 A1
- Document ID: US20140360415A1
- Status: Published application
- Kind: A1
- Application number: 14/363,018
- Filed: 2012-12-05
- Published: 2014-12-11
- Earliest claimed: 2011-12-06
- Assignees: Linak A/S
- Applicants: Linak A/S
- Inventors: Martin Riis; Ulrik N. Rasmussen
- Web page: https://patentgrep.com/patent/US20140360415A1

## CPC

- A47B 9/20: Telescopic guides
- F16B 7/14: locking in intermediate {non-discrete} positions {(the rod or tube being locked by a tilting clip F16B2/246)}
- A47B 2200/0054: with three telescopic parts
- A47B: TABLES; DESKS; OFFICE FURNITURE; CABINETS; DRAWERS; GENERAL DETAILS OF FURNITURE (furniture jointing F16B)
- F16B: DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING (couplings for transmitting rotation F16D)

## Abstract

Lifting column preferably for height adjustable tables comprising a guide (5) and a drive unit (9) where the guide (5) comprises at least a first member (5a) and a second member (5b), where the members (5a, 5b, 5c) are arranged mutually telescopically relative to each other. At the end of the first member (5a) which the second member (5b) can be displaced from sliders are arranged on an internal side thereof. At the end of the second member (5b) extending into the first member (5a) sliders are likewise arranged on the outside thereof. In a first plane the sliders have a first, a large, prestressing between the first member (5a) and the second member (5b), while the sliders in the second plane has a second, a small, prestressing between the first (5a) and second member (5b). Thus, a good dampening of vibrations of the table is achieved in case of exposure to horizontal forces.

## Claims

### Claim 1

A lifting column, comprising: a guide and a drive unit, where the guide comprises at least a first member (5a) and a second member (5b), where the members are mutually telescopically arranged relative to each other and where a first set of sliders (7a) is arranged on an internal side of the first member (5a) at the end of the first member (5a) into which the second member (5b) extends and may be displaced out of, and where a second and third set of sliders (7bb′, 7bb″; 7b′, 7b″) are arranged on the outside of the second member (5b) at the end of the second member (5b) which extends into the first member (5a), wherein the second set of sliders (7bb′, 7bb″), which describes a first plane, has been applied a given first prestressing between the first member (5a) and the second member (5b), while the third set of sliders (7b′, 7b″), which describes a second plane, which is different from the first plane, has been applied a given second prestressing between the first member (5a) and the second member (5b), where the second applied prestressing is smaller than the first applied prestressing.

### Claim 2 (depends on 1)

The lifting column according to claim 1, wherein the prestressing is created by an embossing of the member opposite the sliders.

### Claim 3 (depends on 1)

The lifting column according to claim 1, including at the end of the member (5a) which extends into the second member (5b) two sets of sliders subsequent to each other, the sliders in one plane and in the other plane are offset.

### Claim 4 (depends on 3)

The lifting column according to claim 3, wherein the two sets of sliders in the place where a second, a small, prestressing of these is provided, is provided with a somewhat larger prestressing of the bottommost sliders compared to the topmost sliders.

### Claim 5 (depends on 1)

The lifting column according to claim 1, comprising three or more members (5a, 5b, 5c), where the said prestressing is arranged between a fixed member (5a) and the consecutive member (5b) telescopically arranged relative to the fixed member (5a).

### Claim 6 (depends on 1)

The lifting column according to claim 1, wherein the large prestressing is of a size resulting in a friction of between 15-30 kg between the respective sliders and the member, which slides against these, while the small prestressing is of a size resulting in a friction of between 0-5 kg between the respective sliders and the member, which slides against these.

### Claim 7 (depends on 1)

The lifting column according to claim 1, wherein the members (5a, 5b, 5c) are constituted by pipe profiles, preferably having a square cross section.

### Claim 8 (depends on 1)

The lifting column according to claim 1, wherein the members (5a, 5b, 5c) have a rectangular cross section where one side, the broadside, in the cross section is considerably larger than the length of the other side, the narrow side.

### Claim 9 (depends on 3)

The lifting column according to claim 3, wherein the broadside has a length which is approximately one and a half times larger than the narrow side or larger.

### Claim 10 (depends on 1, 3)

The lifting column according to claim 3, comprising a table top (2) carried by at least one lifting column (5) as defined in claim 1, and where the table top (2) has two long sides (2a, 2b), where one side constitutes a rear side (2b) and the other constitutes a front side (2a), where the user of the table is placed at front side (2a), and two ends (2c, 2d) extending between the front side (2a) and the rear side (2b), and where the large prestressing in the lifting column(s) (5) is provided in the transverse direction of the table top (2) and that the small prestressing is provided in the longitudinal direction of the table top (2).