Supports – Stand – Understructure
Patent
1998-07-17
2000-07-25
King, Anita M.
Supports
Stand
Understructure
248407, F16M 1126
Patent
active
060927712
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates a leg for a piece of furniture.
2. Description of the Prior Art
Among others, describes SE B 442.581 a leg for a piece of furniture is known which for adjustment of the height of the table above the floor is provided with a telescopically movable portion which may be secured in the upper portion which is connected with the tabletop by means of a screw inserted in a threaded hole in the tube side on the upper portion of the leg. On account of the considerable impact on the lower portion from the screw, the lower portion has to be manufactured from a solid material, which makes the construction heavy. In order to make the threaded hole for the screw sufficiently strong, the tube wall around the threaded hole has to have a considerable thickness or be reinforced, for instance by a nut being welded on, which nut may subsequently be abraded for rounding of the corners, which is a laborious process making the whole construction more expensive. Where the tube wall in the upper portion has sufficient thickness for accommodating the threaded hole, the lower leg portion will have substantially smaller cross-section than the upper leg portion, which may be a drawback from an aesthetic point of view and it entails in any case a big material consumption for the upper leg portion and the whole construction becomes comparatively heavy.
Moreover, pieces of furniture are known, in which one of the legs is provided with a lower portion inserted in the upper leg portion by means of a thread, and by means of which the height of one of the legs may be adjusted in order to compensate for irregularities in the floor, or, if all the legs are provided with such a threaded portion, the height of the piece of furniture may be adjusted within a certain interval.
Moreover, a central column for a swivel chair is known, in which the parts are so to speak reversed, such that the tubular portion is placed in the base and the displaceable portion is extending upwards. The fastening device comprises a ring resting against the tubular portion and comprising a guide for the solidly designed, movable portion. The arrangement is based on the use of a screw pressing against the side of the displaceable portion and therefore suffers from the same drawbacks as the constructions discussed above.
It may be desirable in a piece of furniture to be able to change the length of all legs in order to change the height of the piece of furniture, and it will in this connection be desirable that the piece of furniture stands just as stable on the floor as before the adjustment. The adjustment is in other words to be carried out stepwise, and it should be simple to change the individual legs by the same number of steps. Moreover, there is a need for the adjustment interval to be big, for instance 25 cm, which corresponds to approx. 1/3 of the height of a leg. Furthermore, it is of importance that the adjustment may be incorporated in legs for pieces of furniture in which at least a part of the leg is manufactured from a seam-welded steel tube, and where the preparatory steps to be made to the tube are minimal and not damaging to a surface treatment previously made.
It is the object of the invention to provide a leg for a piece of furniture, which meets these requirements and in which such a stepwise adjustment may be made, such that a piece of furniture which has been levelled in advance retains its levelling after the height adjustment, and in which the leg for the piece of furniture is simple to adjust and stable in all settings.
It is also an object of the invention to design the fixing means in such a way that the leg for the piece of furniture on the outside appears with a surface without protrusions protruding substantially outside the surface of the upper leg portion.
These objects are met by a leg for a piece of furniture which is characterized by the subject matter of the characterizing clause of claim 1.
The lower leg portion is stably movable in the upper leg porti
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patent: 2719688 (1955-10-01), Seifert
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patent: 4191111 (1980-03-01), Emmert
patent: 4650145 (1987-03-01), Natzel et al.
patent: 5746152 (1998-05-01), Huse
Baxter Gwendolyn
Clarke Dennis P.
Ideassociates, LTD
King Anita M.
LandOfFree
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