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A chair comprising a support structure bearing a seat and a backrest, in which the backrest comprises a bearing portion and a connecting portion for connection to the support structure, in which the backrest is tiltable rearwards relative to a resting position under a rearwards thrust applied by the

A chair comprising a support structure bearing a seat and a backrest, in which the backrest comprises a bearing portion and a connecting portion for connection to the support structure, in which the backrest is tiltable rearwards relative to a resting position under a rearwards thrust applied by the user and elastically returns to the resting position when the rearwards thrust ceases. The rearwards tilting of the backrest is formed in part by an elastic detonation of the bearing portion and in part by a displacement of at least a part of the connecting portion relative to the support structure.

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The invention claimed is: 1. A chair comprising: a support structure for supporting a seat and a backrest, in which the backrest comprises a bearing portion and two connecting portions for connecting the backrest to the support structure, wherein the bearing portion is a surface for bearing a user'

The invention claimed is: 1. A chair comprising: a support structure for supporting a seat and a backrest, in which the backrest comprises a bearing portion and two connecting portions for connecting the backrest to the support structure, wherein the bearing portion is a surface for bearing a user's back and is provided with at least one weakened area which allows a relative elastic deformation between two adjacent backrest sections, characterized in that said weakened area has the shape of a line which extends on the surface of the backrest, wherein the two connecting portions each comprise a reaction portion housed within a box element that is fixed relative to the support structure and each of the box elements contain an elastic element, and the backrest is tiltable rearwards relative to a resting position under a rearwards thrust applied by the user and elastically returns to the resting position when said rearwards thrust ceases, characterized in that the rearwards tilting of the backrest is formed in part by an elastic deformation of the bearing portion and in part by a displacement of at least a part of the connecting portion relative to the support structure. 2. A chair as claimed in claim 1, characterized in that said weakened area further comprises at least one through slot. 3. A chair as claimed in claim 1, characterize in that said weakened area further comprises at least one slot with reduced thickness. 4. A chair as claimed in claim 1, characterized in that said weakened area substantially extends over the whole length of the bearing surface of the backrest. 5. A chair as claimed in claim 1, characterized in that the bearing surface of the backrest has a central area which is not traversed by said weakened area. 6. A chair as claimed in claim 1, characterized in that it comprises a plurality of mutually parallel weakened areas. 7. A chair as claimed in claim 1, characterized in that the bearing portion of the backrest has a bearing surface with an arched shape with vertical generatrices. 8. A chair as claimed in claim 1, wherein the two connecting portions are mounted oscillating relative to the support structure and co-operating with the elastic element tending to thrust the backrest towards the resting position. 9. A chair as claimed in claim 1, characterized in that said connecting portion comprises two connecting elements each of which has a fastening portion that is fixed relative to the support structure, each of said connecting elements having an elastically yielding portion. 10. A chair comprising: two support structures each comprising two legs and a substantially horizontal portion; a seat connectable to each support structure; a backrest, wherein the backrest comprises two connector portions and a bearing portion wherein the bearing portion is a surface for bearing a user's back, the bearing portion having one or more through slots for allowing the backrest to incline relative to itself, the one or more slots comprising an arrest for limiting the maximum inclination of the backrest adjacent the slots, the arrest comprising the rear edges of each side of the one or more slots; a connecting element attachable to each support structure for attaching the two support structures to the two connector portions, the connecting element housed within a box element that is fixed relative to the support structure; and an elastic element between the connecting element and the support structure for allowing the connecting element to move relative to the support structure. 11. The chair of claim 10, wherein the elastic element further comprises two or more coiled springs. 12. The chair of claim 10, wherein the support structures are substantially on two opposing edges of the seat. 13. The chair of claim 1, wherein the box element comprises a substantially channel shaped cross section and a closing element for closing the open side of the channel. 14. The chair of claim 10, wherein the box element comprises a substantially channel shaped cross section and a closing element for closing the open side of the channel.