Seat Frame

A seat frame, comprising:

• a base, a driving member and a stretching member, wherein the driving member and the stretching member are disposed on the base, wherein the stretching member comprises backrest assemblies, cushion support assemblies and leg rest plate assemblies which are positioned on left and right sides of the base and set in pairs,
• wherein a front end and a rear end of each of the cushion support assemblies are hinged with one end of one of the backrest assemblies and one end of one of the leg rest plate assemblies respectively:
• each of the cushion support assemblies comprises a first support connector, a second support connector, a third support connector and a fourth support connector, wherein one end of the third support connector is hinged at a middle of the fourth support connector, one end of the second support connector is hinged with the other end of the third support connector, and the first support connector is hinged with one of the backrest assemblies;
• and
• wherein each of the leg rest plate assemblies comprises a first leg rest plate connector, a second leg rest plate connector, a third leg rest plate connector and a leg rest plate frame, wherein one end of the first leg rest plate connector is hinged with one end of the fourth support connector, one end of the second leg rest plate connector is hinged with one end of the first support connector, the other end of the second leg rest plate connector is hinged with one end of the third leg rest plate connector, the other end of the first leg rest plate connector and the other end of the third leg rest plate connector are hinged with the leg rest plate frame;
• and when the seat frame is in a television (TV) posture and a lying posture, the leg rest plate frame is inclined upward with respect to a horizontal plane.