Supports – Stand – Standard type
Patent
1991-12-02
1993-11-30
Chotkowski, Karen J.
Supports
Stand
Standard type
2482893, F16M 1300, A47C 300
Patent
active
052658384
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
the present invention relates to a hub construction for a rotatable chair, which automatically returns to the initial position when the chair is relieved, comprising a vertical shaft fastened to the lower side of the seat of the chair and a hub on the leg portion of the chair, to which hub the lower portion of the shaft is rotatably fastened, whereby the return movement is achieved by means of a cam surface acting in the axial direction and located on the end of a spring loaded sleeve enclosing the shaft, which cam surface is arranged to cooperate with a radially directed guide pin.
Background of the Invention
Previously known constructions of returning mechanisms for rotary chairs cannot be applied to chairs with a very heavy construction normally used e.g. in TV-chairs. The known constructions specifically require an excessively large spring force for achieving the desired return movement, which has an adverse effect on the sitting comfort and results in very clumsy constructions. The known constructions normally have two opposite return positions, because of which the chair returns to the position located nearest when the chair is relieved, i.e. when the person sitting on it stand up. As a result, such a construction does not result in a chair, which when left free always returns to the aesthetically most natural position.
The German application DE-OS 3 828 321 described a hub construction according to the introduction, which is however only suited to light chair constructions, such as bar stools and the like. In addition, the manufacturing of this known construction is relatively complex, since the spring loaded sleeve is mounted torsionally rigidly on the shaft of the hub construction. Especially, the manufacturing and working of the shaft and the sleeve is laborious and complicated. As a result of the relatively temporary bearing arrangement mentioned in the description, it is hardly probable that a sufficient spring force can be achieved for ensuring a reliable operation.
Summary and Object of the Invention
The object of the present invention is to eliminate all said drawbacks, which is achieved by means of a hub construction characterized in that a guide pin is fastened to the lower portion of the shaft and that a spring loaded sleeve is mounted torsionally rigidly on the hub.
This construction results in an extremely good sitting comfort, since the return force is barely noticeable when sitting on the chair. The construction itself is very simple and reliable and has practically no effect on the appearance of the chair hub.
The various features of novelty which characterize the invention are pointed out with particularity in the claims annexed to and forming a part of this disclosure. For a better understanding of the invention, its operating advantages and specific objects attained by its uses, reference is made to the accompanying drawings and descriptive matter in which preferred embodiments of the invention are illustrated.
Brief Description of the Drawings
The invention is next described in more detail with reference to the accompanying drawing, in which:
FIG. 1 shows an example of a hub construction according to the invention in a side sectional elevation;
FIG. 2 shows another example of a hub construction according to the invention in a side sectional elevation;
FIG. 3 shows the most preferred embodiment of a hub construction according to the invention in a side sectional elevation; and
FIG. 4 shows an example of a hub according to the invention in top view.
Detailed Description of the Preferred Embodiments
The inventive hub construction comprises a fixed vertical shaft 1 fastened to the lower side of a seat of a rotatable chair, and a hub 2 on the leg portion of the chair, to which hub 2 the lower portion of the shaft 1 is rotatably fastened. The hub 2 has externally the form of a truncated pyramid, whereby each side 2a is provided with threaded fastening holes 3 for the legs of the chair. The number of side 2a in the pyramid thus determines the number o
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Chotkowski Karen J.
F:ma Mekrapid
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