Furniture rotary system having reduced friction, and a piece of furniture comprising such system

The rotary system according to any one of the preceding claims, wherein that member (120, 220, 320, 420, 520) being in sliding contact with the sliding surface (114, 214, 314, 414, 514) comprises at least one blade (124, 126, 224, 324, 424, 524, 526) extending in the rotational direction, preferably the length of the blade (124, 126, 224, 324, 424, 524, 526), as seen along the sliding direction of the rotational member, being 2-70 mm, more preferably 3-50 mm, preferably that member (120, 220, 320, 420, 520) being in sliding contact with the sliding surface (114, 214, 314, 414, 514) comprises at least two separate blades (124, 126, 224, 324, 424, 524, 526), still more preferably that member (120, 520) being in sliding contact with the sliding surface (114, 514) comprises at least three separate blades (124, 126a, 126b, 526) running along the same circular path during rotation.

The rotary system according to any one of the preceding claims, wherein the sliding surface (114, 214, 314, 414, 514) is provided with one or more depressions (116, 516) for receiving one or more blades (124, 126, 224, 324, 424, 524, 526).

The rotary system according to any one of the preceding claims, wherein the plastic member (120, 220, 320, 420, 520) being in sliding contact with the sliding surface (114, 214, 314, 414, 514) is made of a plastic comprising a polymer with polar groups, more preferably the polar groups are selected from the group consisting of hydroxyl groups, carboxylic acid groups, amide groups, halide groups, sulfide groups, cyano groups (nitrile groups), carbamate groups, aldehyde groups, and/or ketone groups, preferably said plastic comprising a polymer selected from the group of polymers consisting of polyoxymethylenes (POM), polyesters (e.g. thermoplastic polyesters, such as polyethylene terephthalate (PET), polytrimethylene terephthalate (PTT), polybutylene terephthalate (PBT), and polylactic acid (PLA), as well as bio-based thermoplastic polyesters, such as polyhydroxyalkanoates (PHA), polyhydroxybutyrate (PHB), and polyethylene furanoate (PEF)), polyamides (PA), polyvinyl chloride (PVC), polyphenylene sulfide (PPS), polyaryletherketone (PAEK;

• e.g. Polyether ether ketone (PEEK)), and Polytetrafluoroethylene (PTFE).

The rotary system according to any one of the preceding claims, wherein the plastic member (120, 220, 320, 420, 520) being in sliding contact with the sliding surface (114, 214, 314, 414, 514) is in its entirety made from a plastic.

The rotary system according to any one of the preceding claims, wherein the sliding surface (114, 214, 314, 414, 514) is made from a material having a Vickers hardness of at least 50 MPa, preferably at least 100 MPa, still more preferably at least150 MPa, such as metal or glass, preferably the material is a metal.

The rotary system according to any one of the preceding claims, wherein the sliding surface (114, 214, 314, 414, 514) is made of aluminum and/or steel.

The rotary system according to any one of the preceding claims, wherein the sliding surface (114, 214, 314, 414, 514) is made of aluminum having a surface layer onto which the lacquer is applied, preferably the surface layer is an anodized oxide surface layer, preferably the thickness of the anodized oxide surface layer is at least 5 micrometers, more preferably at least 10 micrometers.

The rotary system according to any one of the preceding claims, wherein the resin of the lacquer comprises polar groups, such as hydroxyl groups, carboxylic acid groups, amide groups, cyano groups (nitrile groups), halide groups, sulfide groups, carbamate groups, aldehyde groups, and/or ketone groups.

The rotary system according to any one of the preceding claims, wherein the resin of the lacquer is a thermosetting resin.

The rotary system according to any one of the preceding claims, wherein the resin of the lacquer is selected from the group consisting of:

• acrylic resins, acrylate resins, acrylamide resins, methacrylate resins, methyl metachrylate resins, acrylonitrile resins, styrene-acrylonitril resins, acrylonitrile styrene acrylate resins, reaction products or a mechanical mixture of alkyd resin and water-soluble melamine resin, reaction products or a mechanical mixture of a vinyl-modified unsaturated alkyd resin and a water-soluble melamine resin, and polymers and mixtures of one or several of these resins, preferably the resin of the lacquer is an acrylic resin, such as an acrylate resin, an acrylamide resin, a methacrylate resin, or a methyl metachrylate resin and mixtures thereof.

The rotary system according to any one of the preceding claims, wherein the thickness of the lacquer coated on the sliding surface is 100 μm or less, preferably 75 μm or less, more preferably 5 to 75 μm, even more preferably 50 μm or less, still more preferably 10 to 50 μm, and yet more preferably 15 to 40 μm.

The rotary system according to any one of the preceding claims, wherein the sliding surface has been lacquered by electro coating or autodeposition in a bath containing the lacquer, or by electrostatic coating with a powder lacquer, or by wet spraying with a liquid lacquer;

• preferably the sliding surface has been lacquered by electro coating in a bath containing the lacquer or by electrostatic coating with a powder lacquer.

The rotary system according to any one of the preceding claims, wherein the sliding surface is formed by an aluminum member having a surface layer onto which the lacquer is applied, preferably the surface layer is an anodized oxide surface layer, preferably the thickness of the anodized oxide surface layer is at least 5 micrometers, more preferably at least 10 micrometers, and wherein the surface layer has been electrophoretically, such as anaphoretically, coated with a resin, such as an acrylic resin, and subsequently heat cured to form the lacquer coated on the sliding surface, preferably the sliding surface has been coated using the Honny process or one of its derivatives.

The rotary system according to any one of the preceding claims, wherein the lipophilic composition coating comprises compounds comprising C6 to C40, such as C8 to C30, or even C10 to C24, non-aromatic hydrocarbyl groups, such as alkenyl groups and/or alkyl groups, e.g. alkyl groups, preferably the lipophilic composition coating present on the lacquer comprises at least 25 wt. %, such as at least 50 wt. %, of compounds comprising C6 to C40, such as C8 to C30, alkyl groups, more preferably the lipophilic composition coating present on the lacquer comprises at least 25 wt. %, such as at least 50 wt. %, C6 to C40, such as C8 to C30, non-aromatic hydrocarbons, such as alkenes and/or alkanes, e.g. alkanes.

The rotary system according to any one of the preceding claims, wherein the lipophilic composition coating present on the lacquer comprises triglycerides and/or fatty acids;

• preferably said triglycerides, if present, comprises at least 75% saturated fatty acid residues and said fatty acids, if present, comprises at least 75% saturated fatty acids, more preferably the lipophilic composition coating present on the lacquer comprises 1 to 40 wt. % triglycerides and/or fatty acids, preferably said triglycerides, if present, being composed of fatty acids with C6 to C40, such as C8 to C30, alkyl groups, and preferably said fatty acids, if present, having C6 to C40, such as C8 to C30, alkyl groups, still more preferably the lipophilic composition coating present on the lacquer comprises at least 5 wt. %, such as at least 10 wt. %, of triglycerides and/or fatty acids, preferably said triglycerides, if present, being composed of fatty acids with C6 to C40, such as C8 to C30, alkyl groups, and preferably said fatty acids, if present, having C6 to C40, such as C8 to C30, alkyl groups.

The rotary system according to any one of the preceding claims, wherein at least one of the rotational member (120, 520) and the stationary member (110, 510) comprises both a horizontal and a vertical sliding surface (114a, 114b, 514a, 514b) to provide support for the other member (120, 520) in both vertical and horizontal direction, such as in a hinge arrangement of a door leaf (12a, b) or in a furniture turning plate (52), preferably said other member (120, 520) being provided with both vertical and horizontal blades (126, 124, 526, 524) adapted for sliding against said horizontal and vertical sliding surfaces (114a, 114b, 514a, 514b).

The rotary system according to any one of the preceding claims, wherein at least one of the rotational member (210) and the stationary member (220) being a threaded rod (210), and the other member being a nut (220) co-operating with the threaded rod (210) to provide a furniture extension system (22a), such as a furniture extension system (22a, 22b) for a sit to stand table (20), preferably one of the nut (220) and the threaded rod (210) being provided with blades (224, 226) co-operating with a sliding surface (214) arranged on the other member (210, 220).