A chair support structure, comprising a base, a driving component, a first transmission component, a leg component, and a back component, wherein the driving component is connected to the base, the first transmission component is connected to the driving component, and both the leg component and the back component are connected to the first transmission component,
- the first transmission component comprises a first transmission member, the first transmission member comprises a first connection portion and a second connection portion, the first connection portion and the second connection portion each has a first end and a second end opposite to each other, the first end of the first connection portion is pivotally connected to the leg component, the second end of the first connection portion is fixed to the second connection portion, an angle is formed between the first connection portion and the second connection portion, the first end of the second connection portion is pivotally connected to the back component, the second end of the second connecting portion is connected to the driving component,
- the driving component comprises a driving member, the driving member is connected to the base, an output end of the driving member is connected to the second end of the second connecting portion, the driving member is configured for driving the first transmission member to move relative to the base, resulting in the first connecting portion driving the leg component being extended or contracted, and the second connection portion drives the back component to rotate relative to the base to adjust an angle of the back component,
- the first transmission component further comprises a second transmission member, a third transmission member, a fourth transmission member, a fifth transmission member, and a sixth transmission member, each of which has a first end and a second end opposite to each other, the first end of the second transmission member is pivotally connected to the second end of the second connection portion, the second end of the second transmission member is pivotally connected to the first end of the third transmission member, a middle portion of the third transmission member between the first end and the second end is pivotally connected to the base, the second end of the third transmission member is pivotally connected to the first end of the fourth transmission member, and the second end of the fourth transmission member is pivotally connected to the first end of the fifth transmission member, the second end of the fifth transmission member is pivotally connected to the sixth transmission member, and the sixth transmission member is pivotally connected to the base,
- a guide groove is disposed on the sixth transmission member, and the fifth transmission member is provided with a guide portion coupled to the guide groove, which is slidable along the guide groove, the output end of the driving member is connected to the fifth transmission member, and the driving member is configured to drive the fifth transmission member, the fourth transmission member, the third transmission member and the second transmission member to move, resulting in driving the first transmission member to move.