Abstract: The present disclosure provides a seat bracket and a seat, wherein the seat bracket includes: a chassis, including a base and a side plate swingably arranged on the base; a seat frame, swingably arranged on the side plate and having a sitting posture, a TV posture and a zero gravity posture, the seat frame including a swingable seat frame plate; a linkage mechanism, including a first linkage plate and a second linkage plate disposed at intervals, two ends of the first linkage plate being respectively hinged to the side plate and the seat frame plate, two ends of the second linkage plate being respectively hinged to the side plate and the seat frame plate, and the side plate, the first linkage plate, the second linkage plate and the seat frame plate at least enclosing a closed four-linkage structure; and a first driving member, arranged on the base.

Abstract: A backrest mechanism, a seat bracket and a sofa. The backrest mechanism includes: a backrest mounting plate; and a driving assembly, including a front backrest connecting rod, a rear backrest connecting rod and a driving member, the front end of the front backrest connecting rod being hinged to the front end of the backrest mounting plate, the upper end of the rear backrest connecting rod being hinged to the rear end of the backrest mounting plate, the front backrest connecting rod and the rear backrest connecting rod being hinged to a seat frame mounting member by the driving member, and the driving member being provided with a limiting end capable of receiving an external acting force, so as to enable the driving member to rotate relative to the seat frame mounting member.