Foldable seat

Abstract

A foldable seat is disclosed. The foldable seat includes a cushion unit, a backrest unit and a gear adjustment unit. The backrest unit includes at least two connecting rods each including a first rotating rod and a second rotating rod. The gear adjustment unit includes gear teeth, a turntable and a clamping structure, a second end of the first rotating rod is provided with a first hinge shaft, the gear teeth is arranged at an end portion of the second rotating rod, the clamping structure is rotatably connected to the first rotating rod, and the turntable is arranged on the first hinge shaft.

What is claimed is: 
     
         1 . A foldable seat, comprising:
 a cushion unit, wherein the cushion unit is horizontally arranged, and the cushion unit is configured for supporting buttocks of a user;   a backrest unit, wherein the backrest unit comprises at least two connecting rods connected with the cushion unit, and each of the connecting rods comprises a first rotating rod and a second rotating rod; and   a gear adjustment unit through which the first rotating rod and the second rotating rod are connected, wherein the gear adjustment unit comprises a plurality of gear teeth, a turntable and a clamping structure, a first end of the first rotating rod is connected with the cushion unit, a second end of the first rotating rod is provided with a first hinge shaft, an end portion of the second rotating rod is arranged on the first hinge shaft, the gear teeth are arranged at the end portion of the second rotating rod and distributed in an arc shape, the clamping structure is rotatably connected to the first rotating rod, a clamping groove is arranged on the clamping structure, the clamping groove is configured to be engaged with the gear teeth, the turntable is arranged on the first hinge shaft, and the turntable is capable of pushing the clamping structure, so that the clamping structure is connected with or separated from the gear teeth.   
     
     
         2 . The foldable seat according to  claim 1 , wherein the turntable comprises a first abutting portion, a second abutting portion and a concave portion, a distance between the first abutting portion and the first hinge shaft is not less than a distance between a crest of the gear teeth and the first hinge shaft, a distance between the second abutting portion and the first hinge shaft is not greater than a distance between a root of the gear teeth and the first hinge shaft, the concave portion is arranged between the first abutting portion and the second abutting portion, a stop rod is arranged on the second rotating rod, and the stop rod is located in a range of the concave portion. 
     
     
         3 . The foldable seat according to  claim 2 , wherein the second end of the first rotating rod is hollow, and the clamping structure, the turntable and the end portion of the second rotating rod are all arranged inside the second end of the first rotating rod. 
     
     
         4 . The foldable seat according to  claim 1 , wherein a second hinge shaft is arranged on the first rotating rod, the clamping structure is arranged on the second hinge shaft, a torsion spring is arranged on the second hinge shaft, and the torsion spring is connected with the clamping structure. 
     
     
         5 . The foldable seat according to  claim 1 , wherein the foldable seat further comprises an armrest unit, the armrest unit comprises a third rotating rod and a fourth rotating rod, a first end of the third rotating rod is connected with the cushion unit, a second end of the third rotating rod is hinged with the fourth rotating rod, and the fourth rotating rod is capable of rotating towards the cushion unit. 
     
     
         6 . The foldable seat according to  claim 1 , wherein the connecting rod forms an angle with the cushion unit. 
     
     
         7 . The foldable seat according to  claim 6 , wherein a plurality of positioning rods are arranged on the cushion unit, and each of the positioning rods are connected with a respective one of first rotating rods. 
     
     
         8 . The foldable seat according to  claim 1 , wherein a middle portion of the cushion unit is provided with a cross beam. 
     
     
         9 . The foldable seat according to  claim 1 , wherein the foldable seat further comprises a seat cover, the seat cover is detachably connected with the foldable seat, the seat cover covers a surface of the foldable seat, and a zipper is arranged on the seat cover. 
     
     
         10 . The foldable seat according to  claim 9 , wherein a seat pack and a backrest pack are arranged in the seat cover, the seat pack is arranged on the cushion unit, and the backrest pack is arranged on the backrest unit.