Abstract: A chair frame and a casual chair are provided. The chair frame includes a frame mechanism, a connecting rod system and a seat mechanism. The connecting rod system includes a basic component fixed to the frame mechanism; a first front arm pivotally connected to the basic component; a first rear arm pivotally connected to the basic component; a first transverse arm pivotally connected to the first front arm and the first rear arm; a second transverse arm pivotally connected to the first front arm; a second rear arm pivotally connected to the first rear arm and the second transverse arm; a second front arm pivotally connected to the second transverse arm; and a lifting component pivotally connected to the second front arm and the second rear arm. The seat mechanism includes a hip-leg supporting component, a front rocker arm and a rear rocker arm.

Abstract: A chair frame and a multifunctional chair are provided. The chair frame includes a frame body assembly, a hip assembly, a backrest assembly, a linkage assembly, a leg assembly, a retracting and extending assembly, a leg assisting assembly and a restoring elastic member. The frame body assembly includes a retracting and extending actuator; the backrest assembly is connected to the frame body assembly and the hip assembly; a first connecting rod mechanism includes the linkage assembly, the hip assembly and the backrest assembly, and a second connecting rod mechanism includes the linkage assembly, the frame body assembly and the backrest assembly; the leg assembly is disposed on the hip assembly and connected to the retracting and extending actuator; the retracting and extending assembly is disposed on the hip assembly, and the restoring elastic member includes an assembling end and a restoring end.

Abstract: A seat frame and a seat with switchable sitting and lying positions are provided. The seat frame includes a frame, a seat cushion, and a backrest connecting rod mechanism with a polygonal planar structure, the polygonal planar structure includes a front swing arm, a back pole frame, and a T-shaped connecting rod. A front end of the back pole frame is hinged to the upper end of the front swing arm. The T-shaped connecting rod includes two straight rods; an end of one of the two straight rods is defined as a first protruding end hinged to the lower end of the front swing arm, an end of the other of the two straight rods is defined as a second protruding end hinged to a back end of the back pole frame.

Abstract: A mechanical extending mechanism includes a first connecting member, a second connecting member, a third connecting member, a fourth connecting member, a fifth connecting member and a sixth connecting member. The first connecting member is provided with a first rotating portion, the third connecting member is provided with a second rotating portion, and the first rotating portion is rotatably connected to the second rotating portion.

Abstract: A chair frame and a chair. The chair frame includes a pedestal, a lifting assembly, a driving assembly, a bearing framework and an extending assembly. The first restricting members are fixed to the bearing framework. The driving assembly includes a first push rod, a synchronizing rod and two transmission plates. One end of the first push rod is pivotally connected to the pedestal, the other end of the first push rod is pivotally connected to the synchronizing rod, and both ends of the synchronizing rod are fixed to the transmission plate. The transmission plate is connected to a side of the bearing framework. The transmission plate can rotate relative to the framework, and the transmission plate can rotate until the transmission plate abuts against the first restricting member. The lifting assembly is connected between the bearing framework and the pedestal, and the extending assembly is connected to the bearing framework.

Abstract: A chair frame and a casual chair are provided. The chair frame includes a frame mechanism, a connecting rod system and a seat mechanism. The connecting rod system includes a basic component fixed to the frame mechanism; a first front arm pivotally connected to the basic component; a first rear arm pivotally connected to the basic component; a first transverse arm pivotally connected to the first front arm and the first rear arm; a second transverse arm pivotally connected to the first front arm; a second rear arm pivotally connected to the first rear arm and the second transverse arm; a second front arm pivotally connected to the second transverse arm; and a lifting component pivotally connected to the second front arm and the second rear arm. The seat mechanism includes a hip-leg supporting component, a front rocker arm and a rear rocker arm.

Abstract: A seat frame and a seat with switchable sitting and lying positions are provided. The seat frame includes a frame, a seat cushion, and a backrest connecting rod mechanism with a polygonal planar structure, the polygonal planar structure includes a front swing arm, a back pole frame, and a T-shaped connecting rod. A front end of the back pole frame is hinged to the upper end of the front swing arm. The T-shaped connecting rod includes two straight rods; an end of one of the two straight rods is defined as a first protruding end hinged to the lower end of the front swing arm, an end of the other of the two straight rods is defined as a second protruding end hinged to a back end of the back pole frame.