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A foldable bracket of a chair contains a positioning rod, a first rotating rod, a connector, a second rotating rod, and a supporting plate. The positioning rod is connected with the chair. The first rotating rod is rotatably coupled with the positioning rod. The connector is joined with the first ro

A foldable bracket of a chair contains a positioning rod, a first rotating rod, a connector, a second rotating rod, and a supporting plate. The positioning rod is connected with the chair. The first rotating rod is rotatably coupled with the positioning rod. The connector is joined with the first rotating rod. The second rotating rod is rotatably coupled with the connector, and the supporting plate is connected to the second rotating rod.

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1. A foldable bracket of a chair comprising: a positioning rod, a first rotating rod, a connector, a second rotating rod, and a supporting plate, wherein the positioning rod is adapted to be connected with the chair, wherein the first rotating rod is rotatably coupled with the positioning rod, where

1. A foldable bracket of a chair comprising: a positioning rod, a first rotating rod, a connector, a second rotating rod, and a supporting plate, wherein the positioning rod is adapted to be connected with the chair, wherein the first rotating rod is rotatably coupled with the positioning rod, wherein the connector is joined with the first rotating rod, wherein the second rotating rod is rotatably coupled with the connector, and wherein the supporting plate is connected to the second rotating rod, wherein the supporting plate is joined with a fixing seat with three apertures, wherein the fixing seat also includes a pedestal with three tabs fixed therein, wherein the supporting plate is coupled with a holder and the holder includes a biasing spring and an inserting peg, wherein the biasing spring pushes against the inserting peg, and wherein the inserting peg is inserted in one of the three apertures. 2. The foldable bracket of the chair as claimed in claim 1, wherein the positioning rod is adapted to be connected with a leg of the chair, and wherein a connecting method of the positioning rod and the chair is selected from threadconnecting, screw connecting, rivet jointing, and welding. 3. The foldable bracket of the chair as claimed in claim 2, wherein two bottom ends of two sides of the supporting plate are coupled with a stopping member, wherein the two upper ends of the two sides of the supporting plate are joined with two pressing members respectively, wherein each pressing member is covered by a cover and includes a rubber boss secured therein. 4. The foldable bracket of the chair as claimed in claim 2, wherein a first connecting structure of the first rotating rod and the positioning rod comprises a first connecting element with four retaining bosses, a first spring, and a button, wherein the first spring is fitted on the first connecting element, wherein the button is fixed on one end of the first connecting element, and wherein the retaining bosses are retained in a first hole of the positioning rod. 5. The foldable bracket of the chair as claimed in claim 4, wherein a second connecting structure of the connector and the first rotating rod comprises a second connecting element with a locking projection and a second spring, wherein the locking projection presses the second spring, and wherein the locking projection is retained in a second hole of the connector. 6. The foldable bracket of the chair as claimed in claim 5, wherein a third connecting structure of the second rotating rod and the connector comprises a third connecting element, a protrusion with a third spring, and a lid, wherein the lid covers the protrusion and the third spring, wherein the third spring pushes against the protrusion, and wherein the protrusion abuts against a toothed portion of the connector. 7. The foldable bracket of the chair as claimed in claim 1, wherein a first connecting structure of the first rotating rod and the positioning rod comprises a first connecting element with four retaining bosses, a first spring, and a button, wherein the first spring is fitted on the first connecting element, wherein the button is fixed on one end of the first connecting element, and wherein the retaining bosses are retained in a first hole of the positioning rod. 8. The foldable bracket of the chair as claimed in claim 7, wherein a second connecting structure of the connector and the first rotating rod comprises a second connecting element with a locking projection and a second spring, wherein the locking projection presses the second spring, and wherein the locking projection is retained in a second hole of the connector. 9. The foldable bracket of the chair as claimed in claim 8, wherein a third connecting structure of the second rotating rod and the connector comprises a third connecting element with a protrusion, a third spring, and a lid, wherein the lid covers the protrusion and the third spring, wherein the third spring pushes against the protrusion, and wherein the protrusion abuts against a toothed portion of the connector. 10. The foldable bracket of the chair as claimed in claim 7, wherein two bottom ends of two sides of the supporting plate are coupled with a stopping member, wherein the two upper ends of the two sides of the supporting plate are joined with two pressing members respectively, wherein each pressing member is covered by a cover and includes a rubber boss secured therein. 11. The foldable bracket of the chair as claimed in claim 8, wherein two bottom ends of two sides of the supporting plate are coupled with a stopping member, wherein the two upper ends of the two sides of the supporting plate are joined with two pressing members respectively, wherein each pressing member is covered by a cover and includes a rubber boss secured therein. 12. The foldable bracket of the chair as claimed in claim 9, wherein two bottom ends of two sides of the supporting plate are coupled with a stopping member, wherein the two upper ends of the two sides of the supporting plate are joined with two pressing members respectively, wherein each pressing member is covered by a cover and includes a rubber boss secured therein. 13. The foldable bracket of the chair as claimed in claim 1, wherein two bottom ends of two sides of the supporting plate are coupled with a stopping member, wherein the two upper ends of the two sides of the supporting plate are joined with two pressing members respectively, wherein each pressing member is covered by a cover and includes a rubber boss secured therein. 14. The foldable bracket of the chair as claimed in claim 1, wherein the supporting plate is coupled with a holder, wherein the holder is connected with a sliding block, wherein a connecting method of the holder and the sliding block is selected from sticking, thread connecting, screw connecting, rivet jointing, and welding, and wherein the sliding block is fitted on the second rotating rod. 15. The foldable bracket of the chair as claimed in claim 14, wherein two bottom ends of two sides of the supporting plate are coupled with a stopping member, wherein the two upper ends of the two sides of the supporting plate are joined with two pressing members respectively, wherein each pressing member is covered by a cover and includes a rubber boss secured therein. 16. The foldable bracket of the chair as claimed in claim 14, wherein a first connecting structure of the first rotating rod and the positioning rod comprises a first connecting element with four retaining bosses, a first spring, and a button, wherein the first spring is fitted on the first connecting element, wherein the button is fixed on one end of the first connecting element, and wherein the retaining bosses are retained in a first hole of the positioning rod. 17. The foldable bracket of the chair as claimed in claim 16, wherein a second connecting structure of the connector and the first rotating rod comprises a second connecting element with a locking projection and a second spring, wherein the locking projection presses the second spring, and wherein the locking projection is retained in a second hole of the connector. 18. The foldable bracket of the chair as claimed in claim 17, wherein a third connecting structure of the second rotating rod and the connector comprises a third connecting element with a protrusion, a third spring, and a lid, wherein the lid covers the protrusion and the third spring, wherein the third spring pushes against the protrusion, and wherein the protrusion abuts against a toothed portion of the connector.