Supports – Stand – Standard type
Patent
1995-11-09
1997-10-07
Ramirez, Ramon O.
Supports
Stand
Standard type
2481887, 403393, F16M 1300
Patent
active
056738927
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a hub for a rotatable chair, said base hub comprising an essentially pyramidal body having its side faces suited for the mounting of the chair's leg elements thereon and further incorporating a centrally aligned cylindrical cavity suited for accommodating the center rod of the chair seat cushion.
In prior-art constructions, the base hub for a rotatable chair with separate foot elements advantageously fabricated from wood has conventionally been shaped into a massive pyramidal metal piece, whose side faces have usually been provided with two relatively large threaded fixing holes; further, the hub construction has usually required a separate bearing sleeve for the center rod of the chair seat cushion. Accordingly, an expensive as well as work- and material-consuming construction results in which the relatively sturdy fixing screws remaining visible on the outer side of each leg element also remain visible in a manner degrading the otherwise most pleasing look of the chair.
It is an object of the present invention to overcome the above-described problems by providing a hub characterized in that the hub's underside, as an extension of each side face, has an outward slanting flank with at least one hole suited to accommodate a fixing screw adapted to be screwed from underneath the hub into each leg element, respectively, and that each side face additionally has an essentially radially projecting support element adapted for insertion into a mating groove provided to each leg element, respectively.
The hub according to the invention is superior to the prior art by providing a more economical construction with improved aesthetic look in which no fixing screws are visible. Moreover, the present construction has a higher strength and stability than the prior-art embodiments.
The best results are obtained by manufacturing the hub by injection moulding from a composite material including glass-fiber-reinforced thermoplastics such as polypropylene, polyamide or polycarbonate; alternatively, injection-moulded aluminium or zinc are also feasible materials.
Other characterizing properties of the invention are disclosed in the annexed claims 2-12.
The invention is next examined in greater detail with reference to the appended drawings, in which:
FIG. 1 is a side view of an exemplifying embodiment of the hub according to the invention;
FIG. 2 is a top view of the hub shown in FIG. 1;
FIG. 3 is a sectional view of the hub with a leg element mounted on it; and
FIG. 4 is a side view of another embodiment of the hub according to the invention with a partially sectional view into the leg element through one of its side faces.
The hub according to the invention for a rotatable chair comprises an essentially pyramidal body having its side faces 1 suited for the mounting of the chair's leg element 2 thereon. The hub incorporates a centrally aligned cylindrical cavity 3 suited for accommodating the center rod 4 of the chair seat cushion. While FIGS. 1-3 show a hub designed for chair base having five leg elements 2, also constructions with three, four or six leg elements 2 are feasible for certain applications. Each side face 1 of the pyramidal hub at its lower part is flared outward forming a slanting flank 5 with at least one hole 6 suited to accommodate a fixing screw 7 adapted to be screwed from underneath the hub into each leg element 2, respectively. Additionally, each side face 1 has an essentially radially projecting support element 8 adapted for insertion into a mating groove 9 provided to each leg element 2, respectively. By means of these support elements 8 and grooves 9, an extremely stable and fail-proof mounting of the leg elements 2 to the hub is attained. Practically the entire force acting on the center rod 4 of the chair seat cushion is transmitted to the leg elements 2 via their support elements 8, respectively. The fixing screws 7, two of which are provided per each flank 5 as shown in FIGS. 1-3, principally only help to keep the leg elements 2 in place, whereby they are not subje
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Oy Ortus Ab
Ramirez Ramon O.
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