Plane for the seat of armchairs, divans, chairs or similar, with devices for the fixing of the belts that take advantage of the tension of themselves in order to constrain them to the support framework

Abstract: Plane for the seat of armchairs, divans, chairs and similar of the type including a framework for the support of a plurality of belts forming the plane of the seat, where said framework includes two lateral sections (3) that show a protruding tongue (5), provided with fixing U shaped elements (6) inserted around said tongue (5), while the belt (1) passes outside said U shaped sections and is then folded up backwards and inserted between said tongue (5) and said U shaped element (6) so that the tension exerted by said belt presses said U shaped element in order to block the end of said belt against said tongue (5).

Description: This innovation proposes a plane for the seat of armchairs, divans, chairs or similar, of the type that includes a framework for the support of a plurality of belts that form the plane of the seat, in which means are provided that allow to take advantage of the tension of the belts themselves in order to constrain them to said support framework. More precisely, the framework to which the belts are fixed includes two sections that show a protruding tongue and are provided with fixing elements with an U shape, inserted around the edge of said tongues, with the belts that pass outside said U shaped sections, are folded backwards between said sections and the protruding tongues of the framework, so that the tension exerted by the belts presses said U shaped elements in order to block the end of the belts themselves against the tongues. With this system the number of pieces that form the plane for the seat are considerably reduced and the plane results also simplified from the point of view of the assembly. As it is known, the planes of seats used for armchairs, divans, chairs or similar are often formed by a plurality of belts provided, at their ends, with hooks that allow their application to a framework, generally formed by a couple of tubular elements fixed to support elements, which are also formed by tubular elements appropriately shaped. This system is almost laborious as it is necessary to provide each belt with a couple of hooks, provided with a eyelet where it is possible to insert the end of the belt, it is then necessary to sew it or to fix the end of the belt to this eyelet and to provide, in the tubular elements of the framework, the holes necessary for the insertion of the hooks. It is, as it can easily be understood, a very laborious system that should be appropriately simplified. US-A-3 771 583 Shows a plane for the seat of armchairs, divans, chairs or similar of the type including a framework for the support of a plurality of belts (18) forming the plane of the seat which is provided with means suitable to take advantage of the tension of the belts themselves in order to constrain them to the supporto framework. Now this innovation penetrates this environment and proposes a plane for the seat of armchairs, divans, chairs or similar, of the type that include a framework for the support of the plurality of belts that form the plane of the seat, where the framework includes a couple of sections that show a protruding tongue, around which a fixing element with an U shape is inserted, with the end of the belt included between said tongue and said shaped element and the belt that is folded up around said U shaped element and then stretched so that the tension itself of the belt keeps this U shaped element pressed against said tongue in order to block in position the end of the belt itself. In this way a plane for seat is obtained, which is formed by a lesser number of pieces and which results to be much simpler and faster to build and assemble. This and other advantages will appear clearer in the detailed description that follows, provided as a non limitative example, with reference to the enclosed figures, where: figure 1 is the partial perspective view of the plane for the seat according to the innovation; figure 2 is a further partial perspective view of the plane of the seat according to the innovation; figure 3 is a below view of the plane according to the innovation; figure 4 shows, in vertical section, a detail of the plane according to the invention; figure 5 is the front view according to the innovation. With reference to figure 5, the plane is formed by a plurality of belts shown with numer 1, fixed to a framework that includes a couple of base supports 2, formed for instance by tubular elements, with the ends flattened and folded upward, and by a couple of rods or lateral supports shown as a whole with number 3, to which the ends of the belts 1 are fixed. These details can be better seen in figures from 1 to 4. In particular, the rods 3 are formed by special sections with a shape that shows a bend 8, where the ends of the base supports 2 are inserted, and a wall or protruding tongue 5, which, in this specific case, protrudes downward. The ends of the belts 1 are fixed to these rods. For this purpose, a blocking element is used, shown with number 6, formed by a section with an U shape, that is inserted around the tongue 5 in order to block in position the end of the belt 1, and this end is shown in figure 4 with number 7. The distance between the arms of the U shaped element 6 is substantially equal to the thikness of the tongue 5 plus two times the thikness of belt 1. Preferably, anyway, the arms of the U shaped element 6 are slightly bent one towards the other, so that a certain elastic strength is exerted, that tends to block the end of the belt when this is folded up around the tongue 5, during the assembly of the plane of the seat. The belt is then folded up backwards, passed over the U shaped element 6 and then around the rod 3 and at the end stretched, as it is shown in more detail in the following description. Besides, section 3 has a shape that shows a bend 8, where the flattened ends of the base supports 2 are inserted, which can, in case, be solidly constrained to the rod by means of rivets 9 or similar (figure 2). For the assembly, the procedure is the following: first the belts are cut in the right dimension and then the ends are folded up around the tongues 5, inserting afterwards the U shaped section 6, the arms of which, elastically tending to converge one towards the other, block the end of the belt against the tongue, keeping it in position. The belt is then folded up around the U shaped element 6 and then around the section 3 and the opposite end is constrained in the same way to the second rod or lateral support that builds the framework. At this point the base supports 2 are mounted, inserting their ends into the bends 8 of the sections 3, in order to fix them definitively in position through rivets or similar. The length of the belts is calculated in such a way that inserting the supports 2 between the sections or rods 3, these are slightly spaced, tending the belts in this way. The belts exert then a traction that blocks with strength the U shaped elements 6 against the tongues 5, automatically blocking solidly the ends of the belts themselves. In this way the fixing of the belts to the framework of the support is secured without necessity to use hooks, holes or similar. It should be clear, from the provided description, that the plane according to the innovation, is, thanks to the peculiar configuration, much more convenient than those already known. First it is necessary a lesser number of pieces, with a consequent reduction of costs and of assembly times and then also the assembly is simplified and faster. Of course the dimensions, as well as the materials used, could vary according to the use requirements.

Claims: Plane for the seat of armchairs, divans, chairs or similar of the type including a framework for the support of a plurality of belts (1) forming the plane of the seat, and means suitable to take advantage of the tension of the belts themselves in order to constrain them to said support framework, characterized in that said framework includes two lateral sections (3) that show a protruding tongue (5), provided with fixing U shaped elements (6) inserted around said tongue (5), while the belt (1) passes outside said U shaped sections and is then folded up backwards and inserted between said tongue (5) and said U shaped element (6) so that the tension exerted by said belt presses said U shaped element in order to block the end of said belt against said tongue (5). Plane for a seat according to the claim 1, where said lateral sections (3) are shaped in such a way as to present a bend or hollow (8) suitable to receive the flattened end of at least a couple of shaped tubular elements (2), forming part of the seat framework. Plane for a seat according to claim 2, where the elastic strength exerted by said belts (1) is used in order to keep the sections (3) blocked against said tubular elements (2).

Inventors: SEROLDI GIUSEPPE, SEROLDI, GIUSEPPE
Applicants: SEROLDI GIUSEPPE, SEROLDI, GIUSEPPE
Application year: 1996
Main classification: A47C31
IPC codes: A47C7, A47C31