Base frame assembly and chair having the same

A base frame assembly, comprising:

• a frame body;
• a lifting connecting structure arranged on the frame body, wherein the lifting connecting structure is used for driving the frame body to lift up or down;
• a translation connecting structure arranged on the frame body, wherein the translation connecting structure is used for driving the frame body to move back and forth and/or move left and right;
• a backrest connecting structure arranged on the frame body and used for connecting with a backrest, wherein the backrest connecting structure is used for driving the backrest to rotate relative to the frame body;
• and
• a control handle movably arranged on the frame body, wherein the lifting connecting structure, the translation connecting structure and the backrest connecting structure are all connected with the control handle;
• and the control handle is movable and/or rotatable in at least three different directions, to respectively drive the lifting connecting structure, the translation connecting structure and the backrest connecting structure through different motion trajectories;
• the translation connecting structure comprises a rotating seat connected with the control handle, the control handle is able to drive the rotating seat to rotate;
• the translation connecting structure comprises a cushion connecting part and a sliding block, the sliding block is connected with the cushion connecting part;
• and a side part of the rotating seat is connected with the sliding block and is able to drive the sliding block to slide relative to the frame body;
• a clamping block is liftably arranged on the frame body, a clamping groove is arranged in the cushion connecting part, the clamping block is able to extend into the clamping groove;
• a wedge-shaped inclined plane is arranged between the sliding block and the clamping block, and when the sliding block slides, the clamping block is driven to lift up or down through the wedge-shaped inclined plane.